KR100365613B1 - Channel assignment apparatus and method for common packet channel in cdma system - Google Patents

Abstract

The present invention relates to an apparatus and method for transmitting and receiving data through a reverse common packet channel in a code division multiple access communication system of an asynchronous mobile communication method. In order to implement this, in the present invention, when the data transmission through the CPCH is completed, the mobile station records and transmits a specific pattern for notifying the base station that the data transmission is completed in a specific field of a predetermined frame, and the base station receives the data to complete the data transmission. The present invention implements a scheduling apparatus and method for a common packet channel that releases a corresponding CPCH and makes it available to other mobile stations.

Description

Channel Assignment Method and Apparatus for Common Packet Channel in Code Division Multiple Access Communication System {CHANNEL ASSIGNMENT APPARATUS AND METHOD FOR COMMON PACKET CHANNEL IN CDMA SYSTEM}

The present invention relates to a common channel communication apparatus and method of a code division multiple access communication system, and more particularly, to an apparatus and method for communicating data through a common packet channel in an asynchronous code division multiple access communication system.

In a next generation mobile communication system, asynchronous (or UMTS) code division multiple access (W-CDMA) communication system, a random access channel is used as a reverse common channel. channel: (hereinafter referred to as "RACH") and Common Packet Channel (hereinafter referred to as "CPCH") are used.

1 is a diagram illustrating a communication signal transmission / reception relationship of a RACH in a conventional asynchronous reverse common channel. In FIG. 1, reference numeral 151 denotes a signal transmission procedure of a reverse channel, and the channel may be an RACH. 111 denotes an access preamble-acquisition indicator channel (hereinafter referred to as "AICH"), which is a forward channel. Channel is received and responded to by " UTRAN ". The signal transmitted by the RACH is called an access preamble (hereinafter, referred to as an "AP") and is a signal generated by arbitrarily selecting one of a plurality of RACH signatures.

The RACH selects an Access Service Class (hereinafter referred to as "ASC") according to the type of data to be transmitted by a user equipment, and the RACH subchannel set defined in the ASC (RACH sub_channel). A channel that obtains a right to use a channel from a UTRAN using a group) and an AP.

Referring to FIG. 1, a user equipment (UE) uses the RACH and waits for a response from the UTRAN after transmitting a certain length of AP as shown in 162 of FIG. 1. If there is no response for a predetermined time from the UTRAN, the subscriber station retransmits the AP by increasing the transmission power by a certain amount as shown at 164 of FIG. When the UTRAN detects an AP transmitted through the RACH, as shown in 122 of FIG. 1, the UTRAN transmits a signature of the detected AP through an AICH of a forward link. The subscriber station that transmits the AP checks whether the signature transmitted by the UTRAN is detected in the AICH signal transmitted by the UTRAN in response to the AP. In this case, when a signature used for an AP transmitted through the RACH is detected, the subscriber station determines that the preamble is detected by the UTRAN, and transmits a message through a reverse access channel.

However, if the subscriber station receives the AICH signal transmitted by UTRAN within the set time (tp-ai) after transmitting the AP 162 and does not detect the signature transmitted by the subscriber station, the subscriber station detects the preamble by the UTRAN. If not, the AP is resent after a preset time. At this time, the transmit power of the retransmitted AP is increased as 164 by increasing the power of ΔP (dB) than the AP transmitted in the previous state, and the signature used to create the AP is also defined in the ASC selected by the subscriber equipment. Randomly selected one of the signatures. If the AICH signal using the signature transmitted from the UTRAN is not received from the UTRAN after transmitting the AP, the subscriber apparatus waits for a predetermined time and then repeats the above operation by changing the transmission power and signature of the AP. When the subscriber device receives the signal using the signature transmitted by the subscriber device in the process of transmitting the AP and receiving the AICH signal as described above, the subscriber device waits for a preset time and then sends a message of the reverse common channel as shown in 170 of FIG. It spreads to the scrambling code used in the signature, and transmits with a power (reverse common channel message initial power) corresponding to the preamble responded by the AICH signal using a predetermined channelization code.

As described above, when the AP is transmitted using the RACH, the AP can be efficiently detected by the UTRAN and the initial power can be easily set for the reverse common channel message. However, since the RACH is not controlled, The subscriber device has a disadvantage in that it is difficult to transmit packet data having a high transmission rate or a large amount of data to be transmitted by the subscriber device, the transmission time of which is longer than a certain length. In addition, since a channel is allocated through a single AP_AICH, subscriber devices that transmit APs using the same signature use the same channel, so that data transmitted by different subscriber devices may collide with each other, causing UTRAN to not receive it. There is also a disadvantage.

To this end, a method of power control in the reverse common channel in W-CDMA and reducing collisions between subscriber devices has been proposed, and this method is applied to a common packet channel (hereinafter referred to as "CPCH"). have. The CPCH enables power control of the reverse common channel and uses a more reliable method than the RACH in allocating channels to different subscriber devices, thereby allowing the subscriber devices to access a high data rate data channel for a predetermined time (several to several hundreds). ms)) and its purpose is to allow uplink transmission messages below a certain size to be quickly transmitted to the UTRAN without using a dedicated channel.

In order to set up the dedicated channel, many related control messages must be transmitted and received between the subscriber station and the UTRAN, and the transmission / reception time of the control messages also takes a lot. The exchange of messages is a great overhead. Therefore, when transmitting data of a certain size or less, it may be more effective to transmit the data through a common packet channel.

However, since the CPCH is a channel in which a plurality of subscriber apparatuses transmit a preamble using several signatures to acquire a right to use a channel, a collision between CPCH signals of the subscriber apparatuses may occur, and the subscriber apparatus may avoid such a phenomenon as much as possible. Should be used to assign CPCH licenses.

In the asynchronous mobile communication method, a forward scrambling code is used to distinguish a base station from a base station, a reverse scrambling code is used to distinguish a subscriber device from a subscriber device, and an orthogonal code (OVSF) is used to distinguish channels used in the UTRAN. In order to distinguish the channel transmitted from the subscriber station, Orthogonal Code (OVSF) is used.

Therefore, the information necessary for the subscriber device to use the CPCH is used in the scrambling code used for the message part of the reverse CPCH channel, the orthogonal code (OVSF) used in the control unit (UL_DPCCH) of the reverse CPCH message part, and used in the data unit (UL_DPDCH). Orthogonal code (OVSF), the maximum transmission rate of the reverse CPCH, the channel code of the forward dedicated channel (DL_DPCCH) used for power control of the CPCH. The information is necessary information even when a dedicated channel between the UTRAN and the subscriber device is established. In the case of the dedicated channel, the above information is transmitted to the subscriber device through the transmission (overhead) of a plurality of signaling signals before the dedicated channel is established. However, since the CPCH is a common channel rather than a dedicated channel, a combination of signatures used in an AP and a subchannel used in a RACH in the prior art as a method for allocating the above information to a subscriber device. Displays the above information.

2 shows a signal transmission procedure of the forward and reverse channels of the prior art as described above. In FIG. 2, a collision detection preamble (hereinafter referred to as "CD-P") is used to avoid collision of CPCH signals of different subscriber stations in addition to the method of transmitting an AP used in the RACH.

211, 211 shows a flow of a reverse channel in which a subscriber station operates to receive a CPCH, and 201 shows a flow in which a UTRAN operates to allocate a CPCH to a subscriber station. In FIG. 2, the subscriber device transmits an AP 213. Signatures constituting the AP 213 may be distinguished from a set of signatures used in the RACH or by using the same signature but using a different scrambling code. The selection of the signature constituting the AP is different from the method in which the subscriber equipment selects the signature required by the subscriber equipment based on the information as described above, and randomly selects the signature in the RACH. That is, each signature is mapped with an orthogonal code to be used for different UL_DPCCH, an orthogonal code to be used for UL-DPDCH, an orthogonal code to be used for UL-Scrambling code and DL-DPCCH, a maximum number of frames, and a transmission rate. Therefore, selecting a signature at the subscriber device is the same as selecting the four pieces of information mapped to the signature. In addition, the subscriber station is currently available in the base station to which the subscriber station belongs through a CPCH Status Indicator Channel (CPCH Status Indicator Channel: hereinafter referred to as " CSICH ") transmitted before the AP is transmitted. After checking the state of the channel, the subscriber station selects the signature of the channel to be used by the subscriber station from the currently available CPCH channel through the SCICH and transmits the AP. The AP 213 is transmitted to the UTRAN using the initial transmission power set by the subscriber device. In FIG. 2, the subscriber station retransmits the AP 215 if there is no response from the base station after waiting for 212 hours. The retransmission frequency and time 212 of the AP in the retransmission of the AP is a value set before starting the channel acquisition operation for the CPCH, the subscriber station stops the CPCH channel acquisition operation when the retransmission frequency setting value is exceeded.

When the AP 215 of FIG. 2 is received by the UTRAN and the received AP is compared with the AP that the UTRAN receives from other subscriber stations, the UTRAN transmits AP_AICH 203 to the ACK after 202 hours. There are a number of criteria to select compared with the other AP, and a simple example is that the subscriber device can use the CPCH requested to the UTRAN through the AP or the received power of the AP received by the UTRAN is the minimum received power value required by the UTRAN. This may be the case. The AP_AICH 203 of FIG. 2 is a value of the signature constituting the AP 215 received and selected by the UTRAN, and the subscriber device which has transmitted the AP 215 receives the AP_AICH 203 and contains a value of its own signature after 214 hours. The collision detection preamble CD_P 217 is transmitted. The reason for transmitting the CD_P 217 is that many subscriber stations in the UTRAN may transmit the same AP at the same time and request a right to use the same CPCH, and as a result, may receive the same AP_AICH. Once again, the UTRAN chooses subscriber equipment to prevent impulses. Multiple subscriber devices that transmit the same AP at the same time select a signature to use for the CD-P and transmit the CD-P. The UTRAN receiving the plurality of CD-Ps may respond by selecting one CD_P from the received CD_Ps. The criterion for selecting the CD-P may be, for example, a magnitude of the received power of the CD_P received by the base station. The signature constituting the CD_P 217 is any one of the signatures used in the AP, and may be selected and used in the same manner as the RACH described above. That is, any one of the signatures available for the CD-P can be selected and transmitted. In addition, only one signature may be used by the CD-P. When there is only one signature used for the CD_P, the subscriber station uses a method of transmitting a CD_P by selecting an arbitrary time point in a certain time interval.

If the CD_P 217 of FIG. 2 is received by the UTRAN and the UTRAN is selected compared to the CD_P received from other subscriber devices, the UTRAN is referred to as a collision detection indicator channel ("CD-ICH"). .205 sends 205 to subscriber stations after 206 hours. After receiving and interpreting the CD-ICH 205 transmitted from the subscriber device, the subscriber devices check whether the value of the signature used in the CD_P transmitted to the UTRAN is contained in the CD-ICH 205 (CD-ACK check), If yes, the power control preamble (hereinafter referred to as "PC_P") is transmitted. The PC_P 219 uses the determined reverse scrambling code while determining the signature to be used for the AP by the subscriber device and the same channel code (OVSF) as 221 which is a control part (UL-DPCCH) when transmitting the CPCH message of FIG. 2. The PC-P 219 consists of pilot bits, power control command bits, and feedback information bits. The length of PC_P 219 is 0 or 8 slots. The slot is the most basic unit used for transmission of a physical channel in the UMTS method. When the chip rate used in the UMTS method is 3.84M cps, it corresponds to a length of 2560 chips. In the case of 0 slot in the description of the length of the PC_P 219, since the wireless environment of the current UTRAN and the subscriber device is good, it is sufficient to transmit the CPCH message part at the transmission power when the CD-P is transmitted. 8 slots are used when there is no need to adjust the transmit power of the CPCH message part.

The AP 215 and the CD_P 217 of FIG. 2 may use different starting positions of the scrambling code having the same initial value. For example, the AP may have a length of 4096 from the 0 th value of the scrambling code to the 4095 th value, and the CD_P may have a scrambling code. You can use 4096 lengths from 4096 to 8191th value. The AP and the CD_P may use the same portion of the scrambling code having the same initial value, and in order to use this method, the signatures used for the reverse common channel in the WCDMA scheme may be used for the RACH and the CPCH. . The scrambling code used for the PC-P 219 of FIG. 2 may be used from the 0th value to the 21429th value of the scrambling code having the same initial value as the scrambling code used for the AP 215 and the CD_P 217, and the AP 215 and the CD_P. Another scrambling code mapped to the scrambling code used in 217 and 1: 1 may be used.

207 and 209 of FIG. 2 are pilot fields and power of a dedicated physical control channel (hereinafter, referred to as "DL_DPCCH") of a downlink dedicated physical channel (hereinafter, referred to as "DL_DPCH"). Control command field. The DL_DPCCH may use a forward primary scrambling code used for distinguishing a base station from UTRAN, and may use a secondary scrambling code used for capacity expansion of the base station. The channel code (OVSF) to be used for the DL_DPCCH uses a predetermined channel code while the subscriber station selects a signature to be used for the AP. The purpose of the DL_DPCCH is for the UTRAN to power control the PC-P or CPCH message transmitted by the subscriber device. After receiving the PC-P 219, the UTRAN measures the received power of the pilot field of the PC-P and controls the transmit power of the reverse transmission channel transmitted by the subscriber device using the power control command 209 of FIG. The subscriber station measures the DL-DPCCH signal power received from the UTRAN, inputs a power control command in the power control field of PC_P 219 and transmits it to the UTRAN to control the power of the forward channel from the UTRAN.

221 and 223 of FIG. 2 indicate a control part (UL-UL-DPCCH) and a data part (UL-DPDCH) of a CPCH message. The scrambling code used to spread the CPCH message of FIG. 2 uses the same scrambling code as the scrambling code used in PC_P 219 and uses a scrambling code of length 38400 from the 0th value to the 38399th value in units of 10ms. The scrambling code used in the message of FIG. 2 may be the same as the scrambling code used in the AP 215 and the CD_P 217 or may be another scrambling code mapped to 1: 1. The channel code OVSF used by the data part 223 of the CPCH message of FIG. 2 is determined according to a method previously promised by the UTRAN and the subscriber station. That is, since the signature to be used for the AP and the OVSF code to be used for the UL-DPDCH are mapped, when the AP signature to be used is determined, the OVSF code to be used for the UL-DPDCH is determined. The channel code used by the control part UL-DPCCH 221 uses the same channel code as the channel code OVSF used by the PC_P. The channel code used by the control part (UL-DPCCH) 221 is determined in the OVSF code tree structure when the OVSF code to be used for the UL-DPDCH is determined.

Referring to the description of FIG. 2, in the related art, power control of channels is enabled in order to increase efficiency of CPCH, which is a reverse common channel, and collision of signals of reverse links of different subscriber stations using CD_P and CD-ICH. Reduced. However, in the prior art, the subscriber station selects all information for using the CPCH and transmits it to the UTRAN. The selection method may be a combination of a signature of an AP transmitted by a subscriber station, a signature of a CD, and a CPCH subchannel. In the above description of the prior art, even though the subscriber equipment uses the CSICH to view the status of the CPCH currently being used in the UTRAN and requests the UTRAN to allocate a channel of the CPCH required, all information necessary for the subscriber equipment to transmit the CPCH as in the prior art. Determining and transmitting a signal in advance may delay the time taken for channel acquisition and constraints on channel allocation of the CPCH.

The restriction on the channel allocation of the CPCH means that even if there are several CPCHs available in the UTRAN, the same AP-AICH is selected when the CPCHs required by the subscriber stations in the UTRAN are the same. Receiving and transmitting the CD_P which is not selected even if transmitting CD_P again, subscribers that have not selected CD_P must start work for CPCH allocation from the beginning, and even if the number of subscribers are still the same CD There is a high probability that a collision occurs in reverse link transmission of CPCH by receiving -AICH. Also, in the above description, the CSICH is checked, and even though the subscriber device requests the right to use the CPCH, even if the subscriber devices that want to use the CPCH in the UTRAN all receive the CSICH, even if the subscriber device requests the allocation of the available channel in the CPCH, It may happen that the subscriber device requests the allocation of the channel at the same time. In this case, although the base station has other CPCHs that can be allocated, there is a limitation that the base station can only allocate the CPCH required by the subscriber station.

The delay of the time required for acquiring the channel is the same as in the above description of the restriction portion of the CPCH channel allocation. The subscriber station must continuously repeat the CPCH allocation request operation for the allocation of the desired CPCH. In case of using the method of transmitting CD_P at any time point for a certain period of time by using only one signature for CD_P introduced to reduce the complexity of the system, the CD-AICH of one subscriber station is transmitted and processed. However, there is a disadvantage in that the transmission point cannot process the CD-AICH of other subscriber stations.

In addition, in the prior art, one signature used in an AP is matched with one reverse scrambling code. However, each time the number of CPCHs used by a base station increases, the number of reverse scrambling codes used increases, which wastes resources.

Meanwhile, in order to effectively transmit packet data using a common channel like the above-described CPCH, a scheduling method for allocating and releasing a channel is required. Such scheduling is intended to quickly release a channel when there is no data in any reverse channel and to allocate a channel to another mobile station to prevent unnecessary access and waste of resources from the mobile station.

The maximum packet length that can be transmitted through the current CPCH is broadcast from the base station to the mobile station through a parameter called NF_max of the RRC message. Typically, the maximum length of a packet that can be transmitted through the CPCH is 64. Thus, if the frame length of the physical layer is 10 ms and NF_max is assigned to 64, the mobile station can transmit packet data for a time of 640 ms after the first successful access.

However, since the base station knows only the maximum transmission period NF_max allocated by the base station, the base station expects to transmit data up to 640 ms from the mobile station, and reserves the resource of the Node B during the maximum transmission period or resources from other mobile stations. The allocation request is withheld or rejected. Such an operation is a static monitoring of data transmission from the mobile station by the base station, which cannot effectively guarantee scheduling. That is, even if the mobile station terminates data transmission before the maximum transmission period NF_max elapses, the base station monitors the corresponding channel until the maximum transmission period NF_max elapses and releases the channel.

For the above reason, the base station determines that a frame error has occurred from the time when the mobile station terminates data transmission before NF_max to the time when NF_max elapses, and thus causes an operation of resource waste by increasing the power of the mobile station. . In addition, since a channel cannot be quickly allocated to another mobile station requiring a CPCH, the mobile station may repeatedly attempt to access and reduce the stability of the entire system.

Accordingly, an object of the present invention is to provide an apparatus and method for transmitting a message through a common channel in a code division multiple access communication system.

It is another object of the present invention to provide an acquisition link channel of a forward link through which a receiver of a mobile station can receive an acquisition notification channel with low complexity.

It is still another object of the present invention to provide a mobile station receiving method that can simplify detection of multiple signatures transmitted on a capture notification channel of a forward link.

Another object of the present invention is to provide a channel allocation method for efficient power control of a reverse common channel for transmitting a message through a common channel in a code division multiple access communication system.

Another object of the present invention is to provide a channel assignment method for quickly allocating a reverse common channel for transmitting a message through a common channel in a code division multiple access communication system.

Another object of the present invention is to provide a channel allocation method for improving reliability in a channel allocation method of a reverse common channel for transmitting a message through a common channel in a code division multiple access communication system.

It is still another object of the present invention to provide a method for recovering an error occurring in a communication method of a reverse common channel for transmitting a message through a common channel in a code division multiple access communication system.

Another object of the present invention is to provide a method for detecting and resolving a reverse link collision between subscriber devices occurring in a reverse common channel communication method for transmitting a message through a common channel in a code division multiple access communication system. .

Another object of the present invention is to provide an apparatus and method for allocating a channel to transmit a message through a reverse common channel in an asynchronous code division multiple access communication system.

Another object of the present invention is to detect an error when a channel assignment message or a channel use request message occurs in a reverse common channel communication method for transmitting a message through a common channel in a code division multiple access communication system. The present invention provides an apparatus and method.

It is still another object of the present invention to recover an error when a channel assignment message or a channel use request message occurs in a reverse common channel communication method for transmitting a message through a common channel in a code division multiple access communication system. To provide a way.

Another object of the present invention is to detect an error when a channel assignment message or a channel use request message occurs in a reverse common channel communication method for transmitting a message through a common channel in a code division multiple access communication system. To provide an apparatus and method for using the power control preamble to provide.

It is still another object of the present invention to provide an apparatus and method for transmitting and receiving by combining a single code for collision detection and channel allocation of a reverse common packet channel in a code division multiple access communication system.

It is still another object of the present invention to provide a method of dividing a reverse common channel into a plurality of groups and efficiently managing each group.

Another object of the present invention is to provide a method for dynamically managing radio resources allocated to a reverse common channel.

Another object of the present invention is to provide a method for efficiently managing a reverse scrambling code assigned to a reverse common channel.

It is still another object of the present invention to provide a method for a UTRAN to inform a subscriber device of a current state of a reverse common channel.

It is still another object of the present invention to provide an apparatus and method for increasing reliability in transmitting information in which a UTRAN informs a subscriber device of a current state of a reverse common channel.

It is still another object of the present invention to provide an apparatus and method for an encoder and a decoder which can increase reliability in transmitting information in which a UTRAN informs a subscriber device of a current state of a reverse common channel.

It is another object of the present invention to provide an apparatus and method for enabling a subscriber station to quickly know the current state of a reverse common channel transmitted by a UTRAN.

Another object of the present invention is to provide a method for a mobile station to determine whether to use a reverse common channel by using a state of a reverse common channel informed by a base station.

Another object of the present invention is to provide an apparatus and method for allocating a reverse common channel using an AP and a CA signal.

Another object of the present invention is to provide a mapping method for allocating a reverse common channel using an AP and a CA signal.

Another object of the present invention is to provide a method of operating an upper layer of a subscriber device to transmit data through a reverse common packet channel.

It is still another object of the present invention to provide a method capable of indicating a transmission rate of a reverse common channel by a combination of an AP signature and an access slot.

It is still another object of the present invention to provide a method capable of indicating the number of transmission data frames of a reverse common channel by a combination of an AP signature and an access slot.

Another object of the present invention is to provide a method for allocating a reverse common channel to a subscriber device in consideration of the sum of the maximum data rates for each CPCH set when the UTRAN allocates the reverse common channel.

It is still another object of the present invention to provide an apparatus and method for performing reverse outer loop power control with reverse common channel allocation.

It is still another object of the present invention to provide an apparatus and method for transmitting a maximum data rate through a CSICH.

It is still another object of the present invention to provide an apparatus and method for transmitting information on availability of PCPCH through CSICH.

Another object of the present invention is to provide an apparatus and method for transmitting information on the availability of PCPCH with the maximum data rate through the CSICH.

Another object of the present invention is to provide an apparatus and a method for notifying the end of a frame in a common packet channel of a code division multiple access communication system.

It is still another object of the present invention to provide an apparatus and method for notifying that transmission of data through CPCH is terminated when data transmission from the mobile station is terminated before the maximum transmission period.

1 is a diagram illustrating a communication signal transmission / reception relationship of a random access channel among conventional asynchronous reverse common channels.

2 is a diagram illustrating a signal transmission procedure of the forward and reverse channels of the prior art.

3 is a diagram illustrating a signal flow between a subscriber station and an asynchronous land wireless access network for a reverse common channel according to an embodiment of the present invention.

4 is a diagram illustrating a channel structure and a generation structure of a CSICH.

5 is a diagram illustrating an encoder of a CSICH for transmitting an SI bit according to an embodiment of the present invention.

FIG. 6 is a diagram illustrating the structure of a CSICH decoder corresponding to FIG. 5. FIG.

7 illustrates a structure of an access slot used to transmit an access preamble according to an embodiment of the present invention.

8A is a diagram showing the structure of a reverse scrambling code used in the prior art.

8B is a diagram illustrating a structure of reverse scrambling code according to an embodiment of the present invention.

9A and 9B illustrate a channel structure and a generation structure of a common packet channel access preamble according to an embodiment of the present invention.

10A and 10B illustrate a channel structure and a generation structure of a collision detection preamble according to an embodiment of the present invention.

11A and 11B are diagrams illustrating a channel structure and a generation structure of a channel assignment indication channel according to an embodiment of the present invention.

12 illustrates a configuration of an AICH generator according to an embodiment of the present invention.

13A and 13B illustrate an example of implementation of a CA-ICH according to an embodiment of the present invention.

14 is a diagram illustrating a generation configuration for simultaneously transmitting a CD-ICH and a CA-ICH and allocating different channel codes having the same spreading rate according to another embodiment of the present invention.

FIG. 15 illustrates a generation structure for simultaneously transmitting a CD-ICH and a CA-ICH with the same channel code but using different sets of signatures, according to another embodiment of the present invention. FIG.

FIG. 16 is a diagram illustrating a CA-AICH receiver of a subscriber device for a signature structure according to an embodiment of the present invention. FIG.

17 is a diagram showing the structure of a receiver proposed in another embodiment of the present invention.

18 is a diagram illustrating a configuration of a transceiver of a subscriber device according to an embodiment of the present invention.

19 is a diagram illustrating a configuration of a transceiver of a UTRAN according to another embodiment of the present invention.

20 illustrates a slot structure of a power control preamble according to an embodiment of the present invention.

21 is a diagram showing a generation structure of PC_P disclosed in FIG. 20;

FIG. 22A illustrates an embodiment of a method of transmitting a channel allocation confirmation message or a channel use request confirmation message to a UTRAN by a PC_P according to an embodiment of the present invention. FIG.

FIG. 22B illustrates the structure of reverse scrambling codes used in FIG. 22A. FIG.

FIG. 23 illustrates another embodiment of a method for transmitting a channel allocation confirmation message or a channel use request confirmation message to a UTRAN by using a PC_P according to an embodiment of the present invention.

FIG. 24A illustrates another embodiment of a method for transmitting a channel allocation confirmation message or a channel use request confirmation message to a UTRAN by using a PC_P according to an embodiment of the present invention; FIG.

24B illustrates an example of a tree of PC_P channel codes corresponding one-to-one with a signature or CPCH channel number of a CA-ICH according to an embodiment of the present invention.

25A and 25B illustrate another example of a method of transmitting a channel allocation confirmation message or a channel use request confirmation message to a UTRAN by a PC_P according to an embodiment of the present invention.

26A to 26C illustrate a control flow performed for allocating a common packet channel in a subscriber device according to an embodiment of the present invention.

27A to 27C are diagrams illustrating a control flow performed to allocate a common packet channel in a UTRAN according to an embodiment of the present invention.

28A to 28B illustrate control flows performed by a subscriber device for setting and using a stable CPCH using PC_P according to an embodiment of the present invention.

29A to 29C illustrate a control flow performed in a UTRAN for setting and using a stable CPCH using PC_P according to an embodiment of the present invention.

30A and 30B illustrate a control flow for allocating information required for CPCH to a subscriber device using a signature of a AP and a CA message according to an embodiment of the present invention.

FIG. 31 is a diagram illustrating another structure of a CSICH decoder according to an embodiment of the present invention. FIG.

32 is a diagram illustrating a control flow performed at an upper layer of a subscriber device to transmit data through a reverse common packet channel according to an embodiment of the present invention.

33 is a diagram illustrating the flow of signals and data between a subscriber station and a UTRAN to perform reverse outer loop power control according to an embodiment of the present invention.

34 is a diagram illustrating a structure of an Iub data frame for reverse outer loop power control according to an embodiment of the present invention.

35 is a diagram illustrating a structure of an Iur data frame for reverse outer loop power control according to an embodiment of the present invention.

36 is a diagram illustrating a structure of an Iur control frame for reverse outer loop power control according to an embodiment of the present invention.

37 is a diagram illustrating a structure of an Iub control frame for reverse outer loop power control according to an embodiment of the present invention.

38 is a diagram showing the configuration of a frame for notifying the end of data transmission by a mobile station to a base station according to an embodiment of the present invention.

39 is a diagram illustrating a procedure for releasing a common packet channel according to an embodiment of the present invention.

40 is a diagram illustrating a procedure for releasing a common packet channel according to another embodiment of the present invention.

FIG. 41 is a diagram illustrating a procedure for releasing a common packet channel according to another embodiment of the present invention. FIG.

FIG. 42 is a diagram showing a specific transmission structure of PCPCH shown in FIG. 41;

43 is a view illustrating a conventional release process of a common packet channel and a release process of a common packet channel according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

According to an embodiment of the present invention, if it is necessary to transmit a message on a reverse common channel, the subscriber device checks the state of the reverse common channel through the reverse common channel, and then transmits its desired access preamble AP, and the UTRAN captures it to the AP. The response signal (access preamble acquisition display signal) is transmitted through the access preamble acquisition display channel (AP-AICH). The subscriber device receives the access preamble acquisition indication signal and transmits a collision confirmation signal to the UTRAN if it is an acknowledgment (ACK) signal. The UTRNA receives the collision confirmation signal CD and transmits a response signal (collision detection indication signal CD-ICH) to the collision confirmation signal and a channel assignment signal CA for the reverse common channel to the subscriber station. In this case, the subscriber station receives the CD-ICH signal and the channel assignment signal from the UTRAN and transmits a reverse common channel message through the channel assigned by the channel assignment signal if the CD-ICH signal is an ACK signal. The power control preamble may be transmitted before transmitting the message. In addition, UTRAN transmits power control signals for the power control preamble and the reverse common channel message, and the subscriber station transmits power of the power control preamble and the reverse common channel message according to a power control command received through a forward channel. Control.

In the above description, if there are multiple APs that can be transmitted from the subscriber device, the preamble transmitted by the subscriber device may be one of them, and the UTRAN generates an AP-AICH in response to the AP, and the AP After transmitting the -AICH, CA-ICH for allocating such a channel may be generated.

3 is a diagram illustrating a signal flow between a subscriber station and a UTRAN for establishing a reverse common packet channel CPCH or a reverse common channel proposed in an embodiment of the present invention. In the embodiment of the present invention, it is assumed that a reverse common packet channel is used as a specific example of the reverse common channel. However, the reverse common channel may be applied to other common channels other than the common packet channel.

Referring to FIG. 3, the subscriber device synchronizes the timing of the forward link through a forward broadcasting channel and acquires information related to the reverse common channel or CPCH. The information related to the reverse common channel includes information on the number of scrambling codes and signatures used in the AP, the AICH timing of the forward link, and the like. 3 is a signal of a forward link from the UTRAN to the subscriber device, and 331 is a signal of a reverse link from the subscriber device to the UTRAN. In FIG. 3, when a subscriber station needs to transmit a signal through CPCH, it first receives information on the status of CPCHs in the UTRAN through a CPCH Status Indicator Channel (hereinafter referred to as "CSICH"). The information on the status of the CPCHs is the information about each CPCH in the prior art, that is, the number and availability of CPCH in the prior art, but in the present invention, the maximum data rate that can be used for each CPCH and one CPCH In the case where the subscriber station performs the multi-code transmission, the present invention describes information on how many multi-code transmissions are possible. In the present invention, even when transmitting information on whether each CPCH channel is used as in the prior art, it is possible to use the channel allocation method of the present invention. The data rate is a maximum of 960ksps at a minimum of 15ksps (symbol per second) in the next generation asynchronous mobile communication standard scheme, and the number of multi-code transmissions is one to six.

Channel Status Display Channel (CSICH)

Hereinafter, a channel status indication channel (CSICH: CPCH Status Indicator Channel) transmitted by a base station to a subscriber device for allocation of a common packet channel according to an embodiment of the present invention will be described in detail. The present invention proposes that a base station transmits a physical channel to be used by transmitting usage state information of a physical channel (hereinafter referred to as a "common packet channel") and a maximum available data rate information to a mobile terminal through a CSICH. This is how you make it available for assignment.

Therefore, the detailed description to be described later will be described in the following order.

First, as described above, the structure and generation structure of the CSICH for transmitting the use state information of the common packet channel and the maximum usable data rate information are proposed.

Secondly, a method of transmitting the usage state information of the common packet channel and the maximum usable data rate information by the CSICH is proposed.

Hereinafter, the present invention will be described in detail by the above-described procedure.

First suggestion

The structure and generation structure of the CSICH for transmitting the usage state information of the common packet channel and the maximum usable data rate information proposed above are described in detail as follows.

4 is a diagram illustrating a channel structure and a generation structure of a CSICH according to an embodiment of the present invention. The CSICH shown in FIG. 4 is a channel for transmitting information on the status of CPCHs in the UTRAN using the 8 bits of the unused rear end of the access preamble acquisition indicator channel (AICH). In this case, the AICH is a channel used by the base station according to the W-CDMA scheme to receive an access preamble (AP) from a subscriber station and for a response to the received AP. The response may be provided in ACK or NAK. The AP is a channel used for informing the base station when there is data to be transmitted through the common packet channel.

4 is a diagram illustrating a channel structure of a CSICH.

Referring to FIG. 4, 431 of FIG. 4 shows a structure in which an AP-AICH unit 32 bits and a CSICH unit 8 bits to be transmitted are included in one access slot. As shown in 411 of FIG. 4, a slot serving as a reference for transmitting and receiving an AP and an AP-AICH in the CDMA scheme may be configured as 15 access slots for a 20 ms frame. Meanwhile, the length of one frame is 20 ms, and each access slot constituting the one frame has a length of 5120 chips. As described above, the 431 shows a structure in which the AP-AICH and the CSICH are simultaneously transmitted in one access slot. If there is no data to transmit in the AP-AICH portion, data is not transmitted in the AP-AICH portion. The AP-AICH and the CSICH are spread with a predetermined channel code through a predetermined multiplier. The predetermined channel code is a channel code designated by the UTRAN, and the AP-AICH and the CSICH use the same channel code. In the description of the embodiment of the present invention, a spreading factor of a channel code is assumed to be 256. The spreading rate means that an orthogonal code (OVSF CODE) having a spreading length per symbol is multiplied. In the W-CDMA scheme, one symbol of the AP-AICH and the CSICH includes 2 bits. Meanwhile, different information may be transmitted to the AP-AICH and the CSICH in each access slot, and the information of the CSICH transmitted every 20 ms frame is 120 bits. In the above description, when the CPCH channel state information is transmitted to the CSICH, 8 bits of the unused part of the AP-AICH are used. However, since the CD-ICH structure is physically identical to the AP-AICH, it is also possible to transmit CPCH channel state information to be transmitted to the CSICH to the CD-ICH.

As described above, 120 bits are allocated to the CSICH according to an embodiment of the present invention in one frame, and the use state information of the common packet channel and the maximum usable data rate information are transmitted through the CSICH. That is, the one frame consists of 15 slots, and each slot is assigned an 8-bit area to the CSICH.

Second suggestion

The mapping structure for transmitting the usage state information of the common packet channel and the maximum usable data rate information by the CSICH in the UTRAN proposed second, and the mapping method according to the mapping structure will be described in detail as follows. That is, as described above, according to the embodiment of the present invention, a method of mapping the usage state information of the common packet channel and the maximum usable data rate information to 120 bits allocated to one frame is proposed.

In addition, in the embodiment of the present invention, the information transmitted through the CSICH in the UTRAN includes information on the maximum data rate that can be used in the CPCH and information on whether each PCPCH used in the UTRAN is used as described above. Meanwhile, information on the maximum usable data rate of the CPCH may be transmitted including information on the number of multi codes used when multi code transmission is used in one CPCH.

First, a method of transmitting information on a maximum available data rate of CPCH in UTRAN according to an embodiment of the present invention will be described in detail. In the following detailed description, a case where multi code transmission is used and a case where no is used in one CPCH will be described separately.

A simple application example of transmitting the number of multi-codes used when the multi-code transmission is used in one CPCH together with the maximum possible data rate information of the CPCH among the information transmitted through the CSICH can be performed as shown in Table 1 below. Do. In Table 1 below, seven data rates (SF 4, SF 8, SF 16, SF 32, SF 64, SF 128, SF 256) are taken as examples of the maximum possible data rates of CPCH.

Information Bit representation Bit rate 15ksps (SF 256) 0000 (000) Data Rate 30ksps (SF 128) 0001 (001) Data Rate 60ksps (SF 64) 0010 (010) Data Rate 120ksps (SF 32) 0011 (011) Data Rate 240ksps (SF 16) 0100 (100) Bit rate 480ksps (SF 8) 0101 (101) Bit rate 960ksps (SF 4) 0110 (110) Number of multiple signs 2 0111 Number of Multiple Signs 3 1000 Number of Multiple Signs 4 1001 Number of Multiple Signs 5 1010 Number of Multiple Signs 6 1011

In Table 1, the multiple code has a spreading rate of 4, and in the W-CDMA scheme, the spreading rate of the channel code of the subscriber device is only 4 when the subscriber station transmits the multiple codes. As shown in Table 1, the maximum possible rate information of the CPCH transmitted in the CSICH can be represented by 4 bits in the embodiment of the present invention. As a method of transmitting the 4 bits to the subscriber device to use the CPCH through the CSICH, the 4 bits can be repeatedly transmitted in one slot of 8 bits allocated to the CSICH or transmitted using a separate (8, 4) encoding method. have.

In the above-described example with reference to Table 1, it has been described as transmitting 4 bits including 1 bit to inform the subscriber device of the number of multiple codes according to the use of multiple codes. However, as mentioned above, if multiple codes are not used, only 3-bit information in parentheses of Table 1 may be transmitted. In this case, the 3-bit information is information on the maximum available data rate of the CPCH. In this case, 8 symbols may be transmitted in one slot using (8,3) coding, or the 3 bits may be repeated twice and one symbol of the 3 bits may be repeatedly transmitted.

Next, a method of transmitting the usage status information of the PCPCH in the UTRAN according to an embodiment of the present invention will be described in detail.

The usage state information of the PCPCH to be transmitted is information on whether each PCPCH used in the UTRAN is used, and the number of bits of the usage state information of the PCPCH is determined by the total number of PCPCHs used in the UTRAN. The bits of the usage state information of the PCPCH may also be transmitted through a CSICH. To this end, methods for mapping the bits of the usage state information of the PCPCH to an area allocated to the CSICH should be proposed. Hereinafter, bits of a region allocated to the CSICH among the bits in the frame are collectively used as CSICH information bits. The mapping method may be determined by the number of bits of the CSICH information and the total number of PCPCHs used in the UTRAN, that is, the number of bits of the usage status information of the PCPCH.

First, in transmitting the PCPCH usage status information among the information that can be transmitted through the CSICH, the number of bits of the usage status information of the PCPCH due to the total number of PCPCHs used in the UTRAN may be equal to the number of CSICH information bits in one slot. This is the case. For example, this is the case that the number of CSICH information bits in one slot is 8 bits and the total number of PCPCHs used in the UTRAN is eight. In this case, by mapping the usage status information bits of one PCPCH to one CSICH information bit, the status information of all PCPCHs used in the UTRAN can be repeatedly transmitted 15 times in one frame.

In the above case, a simple example of using the CSICH information bits will be described. A third CSICH information bit of the plurality of CSICH information bits indicates a usage state indicating whether the third PCPCH is used among the plurality of PCPCHs used in the UTRAN. Means information. Therefore, the transmission of 0 as the value of the third CSICH information bit indicates that PCPCH No. 3 is currently in use, and the transmission of 1 by the value of the third CSICH information bit indicates that the PCPCH No. 3 is not currently in use. will be. The value of the CSICH information bit indicating whether the corresponding PCPCH is used may be used interchangeably with the meanings of 0 and 1. FIG.

Next, when transmitting the usage status information of the PCPCH among the information that can be transmitted through the CSICH, the number of bits of the usage status information of the PCPCH due to the total number of PCPCH used in the UTRAN. In this case, a multi-CSICH method for transmitting the usage state information of the PCPCH through at least two CSICHs and a method for transmitting a plurality of slots or a plurality of frames through one channel may be used.

The first method of transmitting the usage state information of the PCPCH through at least two CSICHs is to transmit the use state information of the PCPCH through CSICH information bits of different channels in units of 8 bits. In this case, the CSICH information bits of the different channels correspond to the unused rear 8 bits of bits configuring one access slot of each of the AP-AICH, the RACH-AICH, and the CD / CA-ICH. For example, when the total number of PCPCHs used in the UTRAN is 24, the 24 PCPCHs are divided into 8 units, and the status information of the first 8 PCPCHs is not used among bits constituting one access slot of the AP-AICH. Transmit through 8 bits later. Status information of the next 8 PCPCHs is transmitted through the unused rear 8 bits of bits constituting one access slot of the RACH-AICH. Finally, the state information of eight PCPCHs is transmitted through the unused rear 8 bits of bits constituting one access slot of the CD / CA-ICH.

As described above, when the number of bits of usage state information of the PCPCH to be transmitted is large, all or part of the plurality of channels (AP-AICH, RACH-AICH, CD / CA-ICH) proposed above may be used. Can be divided and sent. Since the plurality of channels, that is, the AP-AICH, the RACH-AICH, and the CD / CA-ICH each use different forward channel codes, the subscriber station may receive the channels separately. That is, the subscriber device can receive multiple CSICHs.

In addition to the foregoing, when the number of bits of the usage state information of the PCPCH is large, a method of allocating a plurality of CSICHs to a plurality of forward channel codes and transmitting the same to the subscriber device may be used.

The second method of transmitting the usage status information of the PCPCH through at least two CSICHs is transmitted through a plurality of slots or a plurality of frames transmitted through one channel using the usage status information of the PCPCH in units of 8 bits. will be.

For example, if the use status information of the PCPCH to be transmitted is 60 bits, the 60 bits can be repeatedly transmitted only twice in the CSICH information bit in one frame composed of 120 bits. Repetition of the 60 bits twice may reduce the reliability of the usage state information of the transmitted PCPCH. In order to solve this problem, the information bit of the 60-bit CSICH can be repeatedly transmitted through the next frame. Otherwise, the 60 bits may be divided into 30 bits, and the first 30 bits may be repeatedly transmitted four times to the CSICH information bits in one frame, and the remaining 30 bits may be repeatedly transmitted four times to the CSICH information bits in the next CSICH frame.

Lastly, in the case of transmitting the PCPCH usage state information among the information that can be transmitted through the CSICH, the number of bits of the PCPCH usage state information is small due to the total number of PCPCHs used in the UTRAN. In this case, the use status information of the PCPCH can be transmitted using only 120 bits of CSICH information bits allocated in one frame. That is, the CSICH information bit for transmitting the usage state information of the PCPCH is reduced to transmit the usage state information of the PCPCH.

For example, if the usage status information of the PCPCH for transmission is 4 bits, the usage status information of the PCPCH is transmitted to the first 4 bits of the 8-bit CSICH information bits in each access slot constituting one frame, and the remaining 4 bits Do not transmit the usage status information of the PCPCH. The CSICH information bits that do not transmit the usage status information of the PCPCH may transmit a null bit known to the subscriber device. As another example, two bits of PCPCH usage state information and two bits of null bits may be repeatedly transmitted to the 8-bit CSICH information bits in each of the access slots constituting the frame. Alternatively, one bit of PCPCH usage status information and one bit of null bits may be repeatedly transmitted to the 8 bit CSICH information bits in each of the access slots constituting the frame. In addition, the usage status information of the PCPCH may be transmitted in all 8 bit CSICH information bits in the first access slots constituting one frame, and then null bits may be transmitted in all 8 bit CSICH information bits in the access slot. That is, the method repeatedly transmits the usage state information and the null-bit of the PCPCH with one access slot. Therefore, the usage status information of the PCPCH is transmitted through the odd-numbered access slots in one frame, and null-data will be transmitted through the even-numbered access slots. Meanwhile, the usage state information of the PCPCH may be transmitted through an even numbered access slot, and null data may be transmitted through an odd numbered access slot. The null bit may be replaced with DTX (Discontinuous Transmission). The DTX means that no data is transmitted.

In this case, the subscriber station will receive the usage status information and the null-bit of the PCPCH through one frame. If the UTRAN uses DTX as null bits, the subscriber station may use DRX (hereinafter referred to as "DRX"). The DRX means that reception is not performed in a section in which data is not transmitted.

By the examples as described above, the UTRAN transmits the usage status information of the PCPCH to the UEs so that the UE that wants to transmit data through the CPCH can monitor the current usage status of the PCPCH. That is, the UE intending to use the CPCH receives the usage status information of the PCPCH transmitted through the CSICH and checks whether the PCPCHs available in the UTRAN are available. Accordingly, the UE intending to use the CPCH may request the allocation of the PCPCH that can be used by the current UTRAN in requesting the allocation of the PCPCH. The UE intending to use the CPCH will select an AP signature requesting allocation of any one desired PCPCH among the PCPCHs identified as usable by the usage state information of the PCPCH and transmit it to the UTRAN. Meanwhile, the UTRAN transmits an ACK or NAK in response to the AP signature through the AP-AICH. Meanwhile, as described above, the UTRAN transmits usage state information of the PCPCH through the AP-AICH. When the UE receives an ACK signal from the UTRAN through the AP-AICH channel, the UE selects an arbitrary CD signature and transmits the CD-P. The UTRAN transmits an ACK or NAK and CA signal in response to the CD-P. When the UE receives an ACK signal and a CA signal for the CD from the UTRAN, the UE compares the CPCH channel allocated with the result confirmed by the monitoring process. If it is determined by the comparison that the PCPCH determined to be in use has been allocated, it can be seen that the CA is an error. Accordingly, the UE may not transmit a signal through the PCPCH allocated thereto. Alternatively, the CSICH can be monitored again after the PCPCH has been allocated by the above-described procedure. If the PCPCH assigned by the user has been previously monitored, the CA has been normally received if the PCPCH has been previously used. Otherwise, if your assigned PCPCH is already in use in the previous monitoring or is not marked as being used in this monitoring, you know that it is a CA error. This second monitoring can be done after starting the PCP or message transmission first, at which point the transmission stops if an error is detected.

In the above description, the method for transmitting the maximum available data rate to the UE by the UTRAN and the method of transmitting the usage status information of the PCPCH to the UE have been described.

Finally, it is also possible to transmit the two pieces of information simultaneously. Description according to specific embodiments thereof is as follows.

First embodiment

According to the first embodiment of the present invention, both of the slots constituting one frame of the CSICH are used to transmit the maximum data rate, and the remaining slots are used to determine whether PCPCH is available. It is a method of transmitting usage status information. One frame of the CSICH currently used in the asynchronous standard may be the same length as one access frame. The length of the frame is also 20 ms and the frame consists of 15 access slots. As an example of the method, it is assumed that the information bits required to transmit the maximum data rate used in the UTRAN are 3 bits, and the number of PCPCHs used in the UTRAN is 40. In this case, the UTRAN may use three of the 15 slots constituting the CSICH frame to transmit the maximum data rate, and the remaining 12 slots may be used to transmit the usage status information of the PCPCH. That is, the UTRAN may transmit the maximum data rate of 24 bits and the usage status information of the PCPCH of 96 bits in one frame.

Therefore, assuming that the same data is transmitted on the I channel and the Q channel in the CSICH, information on the maximum data rate of 3 bits may be repeatedly transmitted four times. In addition, 40-bit usage status information indicating whether the PCUTHs used in the UTRAN are available may be transmitted once corresponding to each of the I and Q channels. In contrast, assuming that different data are transmitted on the I channel and the Q channel, information on the maximum data rate of 3 bits may be repeatedly transmitted a total of eight times. In addition, the usage status information for each PCPCH used in the UTRAN can be repeatedly transmitted twice. In the first method described above, the positions of the slot for transmitting the maximum data rate and the slot for transmitting the usage status information of the PCPCH used by the UTRAN may be arbitrarily arranged or predetermined by the UTRAN.

An example of the arrangement method is in 15 access slots in one frame of CSICH. Information on the maximum data rate is transmitted through the 0th slot, the 5th slot, and the 10th slot, and the usage status information of the PCPCH is the remaining. Can transmit through slots. As another example, information about the maximum data rate may be transmitted through the 0th slot, the 1st slot, and the 2nd slot, and the usage status information of the PCPCH used in the UTRAN may be transmitted through the 3rd through 14th slots. How many slots are allocated to the information on the maximum data rate, and how many slots are allocated to the usage status information of the PCPCH may be determined in consideration of the number of PCPCHs used in the UTRAN and the number of repetitions of the maximum data rate. . In addition, the maximum data rate and the usage state information of the PCPCH may be divided into several CSICH frames according to the amount of information. What information is transmitted in which slot is transmitted in advance with the UE before transmitting the CSICH. I promise.

Second embodiment

According to the first embodiment of the present invention, the two information bits are simultaneously transmitted. The CSICH information bits transmitted in one access slot are divided into several bits to indicate the maximum data rate, and the remaining information bits indicate the use of PCPCH. This method is used to display status information.

For example, in the case of transmitting the same bit on the I channel and the Q channel, the first two bits of one access slot are used to transmit information about the maximum data rate available in the PCPCH of the UTRAN, and the remaining 6 bits of the PCPCH of the UTRAN. Can be used to transmit usage status information. Therefore, one bit is transmitted through one access slot and information about the maximum data rate is transmitted by one bit through one access slot.

However, when different bits are transmitted through the I channel and the Q channel, the maximum data rate and the usage state information of the PCPCH can be transmitted twice as compared to the case of majoring the same bits through the aforementioned 1 and Q channels. have.

In the above-described second embodiment, the first 2 bits of one access slot are used to transmit the maximum data rate of the PCPCH, and the remaining 6 bits are used to transmit the usage status information of the PCPCH. However, even in the above-described exception, various modifications are possible, such as transmitting the maximum data rate using 6 bits of one access slot and transmitting the PCPCH use status information using 2 bits of one access slot. That is, the maximum data rate of the PCPCH and the number and location of bits used to transmit the PCPCH usage status information may be arbitrarily determined by the UTRAN to notify the UE. On the other hand, if the maximum data rate of the PCPCH and the number and location of bits used to transmit the PCPCH usage status information are determined in advance, an appointment with the UE may be made prior to the transmission of the CSICH.

In addition, the UTRAN may transmit the two pieces of information through a plurality of access slots or a plurality of frames. When the two pieces of information are transmitted through the plurality of frames, the two pieces of information are many or to increase the reliability of the pieces of information. In determining the number of access slots for transmitting the two pieces of information, the UTRAN takes into account the two pieces of information, namely, the maximum data rate and the number of bits required for transmitting the common state information of the PCPCH. The number of frames for transmitting the two pieces of information is also considered in consideration of the maximum data rate and the number of bits required for transmitting the commercial state information of the PCPCH.

Third embodiment

A third embodiment of simultaneously transmitting the two pieces of information according to the present invention is a method of transmitting the maximum data rate available in the PCPCH and the usage state information of the PCPCH through a plurality of CSICHs that can be simultaneously transmitted. For example, information on the maximum data rate that can be used is transmitted through one CSICH among a plurality of CSICHs, and usage state information of the PCPCH is transmitted through the remaining CSICHs. In the above example, a method of distinguishing the transmitted CSICHs may be distinguished by a forward channel code or a forward scrambling code. Unlike the above example, a method of transmitting 40 CSICH information bits in one access slot may be used by allocating a separate channel code corresponding to one CSICH. As described above, when a method for allocating a separate channel code corresponding to one CSICH is used, the maximum transmission rate of the PCPCH and the usage state information of the PCPCH can be transmitted together in the access slot.

In the above-described third embodiment, the determination of how many CSICHs to transmit may be determined in consideration of information on the maximum transmission rate of PCPCH, information on the total number of PCPCHs used in the UTRAN, and reliability of the information. .

Fourth embodiment

A fourth embodiment of simultaneously transmitting the two pieces of information according to the present invention is a method of transmitting using a plurality of frames. That is, all CSICH information bits in one frame transmit information on the maximum data rate available in the PCPCH, and all CSICH information bits in the remaining frames transmit usage status information of each PCPCH used in the UTRAN.

In the above-described fourth embodiment, the number of frames to transmit information about the maximum data rate of the PCPCH and the number of frames to transmit the PCPCH usage status information to the frame can be determined in consideration of the amount of information to be transmitted to the CSICH and the reliability of the information amount. have. At this time, the determination will have to be promised in advance with the UE.

Fifth embodiment

A fifth embodiment of simultaneously transmitting the two pieces of information according to the present invention is a method of transmitting information on a maximum data rate in bits of a predetermined position among CSICH information bits. That is, among the CSICH information bits in the frame, information on the maximum data rate of the PCPCH is transmitted through the CSICH information bits of a position previously promised between the UTRAN and the UE. On the other hand, in addition to the CSICH information bits for transmitting the information about the maximum data rate through the remaining CSICH information bits transmits the usage status information of each PCPCH used in the UTRAN.

In the fifth embodiment described above, an example of a method of transmitting information on the maximum data rate of the PCPCH in the CSICH information bit and transmitting the same may be represented by Equation 1 below.

In Equation 1, i is the number of bits when information on the maximum possible data rate is expressed in bits (information bits of the maximum data rate), and d _i is information on the maximum possible data rate to be transmitted. . For example, when i is 3, when {1 0 1} is expressed, d0 = 1, d1 = 0, and d2 = 1.

In the fifth embodiment described above, an example of a method of transmitting and using the usage state information of the PCPCH in the CSICH information bit may be expressed as Equation 2 below.

In Equation 2, j is the total number of PCPCHs used per CPCH set of the UTRAN, and P _j is the usage state information of each PCPCH. Accordingly, the number of PCPCHs is 16, and the use state information P _j of the PCPCH indicating whether each PCPCH is used is represented by {0 0 0 1 1 1 0 0 1 0 1 0 1 1 0 0} and the like.

Equation (3) shows that when the total number N of CSICH information bits that can be transmitted through one frame is determined, the maximum data rate with the usage status information of the PCPCH among the total bits of the CSICH information bits is determined. It is shown that 0 is written in the remaining bits except for the bits required to transmit the information repeatedly by the set number of times.

or

In Equation (3), k denotes the remaining CSICH information bits used to transmit the information bits for the maximum data rate that can be transmitted in the PCPCH and the usage status information of each PCPCH used in the UTRAN, and performs zero fading or DTX. The number of bits to do

Equation 4 below shows the total number of bits N of CSICH information bits that can be transmitted through one frame.

When N defined in Equation 4 is smaller than 120, it is selected from divisors of 120. Specific examples may be N = 3, 5, 15, 30, and 60. In Equation 4, R is the number of times to repeat the information bits of the maximum possible data rate in one access frame. I and J shown in Equation 4 are determined at the time of system implementation, and thus can be known in advance because the URAN notifies the UE. That is, a value already given from a higher layer message.

As a method of determining the aforementioned N, first, the I and J may be known, and among the values satisfying the condition of N≥I + J, the minimum value may be determined from 3, 5, 15, 30, and 60. Alternatively, the UTRAN may transmit N or R values other than the I and J to the UE to determine R or N and K by Equation 4.

The order in which the N and R values are determined can be three as follows.

In the first method, the value of N is determined by the given value of I and J, and the value of R can be determined by the quotient of (N-J) divided by I. That is, as shown in Equation 5 below.

In the second method, an N value is given in advance using an upper layer message, and an R value is obtained using Equation 5 above.

In the third method, an R value is given in advance using a higher layer message, and an N value is obtained using an R * I + J value.

On the other hand, K value can be obtained using K = N- (R * I + J).

As described above, various methods are available for arranging information with respect to I, J, R, N, and K values. Examples are shown in the following embodiments.

N total bits Where SI ₀ represents the first bit and SI _N-1 represents the Nth bit.

In Equation 6, r is an intermediate variable and may be defined as a quotient of J divided by R.

In Equation (7), s denotes the remaining bits that do not fit into the R groups by r bits of the J bits as intermediate variables. In this case, s is a number smaller than R. That is, s satisfies the condition of "0≤s <R" and is the remainder of J divided by R.

A first embodiment of arranging information bits is as follows.

Equations (8) and (9) are equations for determining in which position of the CSICH to transmit bits indicating the maximum data rate that can be transmitted.

When transmitting to the CSICH in the manner described above, bits are transmitted in the following order, and the UE knows the I, J, R, and K values as described above, and thus, the bit array is known.

For example, when I is 3, J is 16, N is 30, R is 4, and K is 2, the maximum data rate information (3 bits), 5 bits (1 to 5) of 16 bits of PCPCH usage status information, and Data rate information (3 bits), next 5 bits (5 ~ 10) of 16 bits of PCPCH usage status information, maximum data rate information (3 bits), next 5 bits (11 ~ 15) of 16 bits of PCPCH usage status information, maximum The bit rate information (3 bits) is used, and the second two bits are padded with DTX or 0. At this time, the 16th bit (the s) indicating the last PCPCH use status information is located behind 5 bits (1 to 5) of the first 16 bits. If the s bit is 2, the process is placed after the next block 6-10.

Equation 10 and Equation 11 are equations for determining in which position of the CSICH to transmit bits indicating usage status information of each PCPCH used in the UTRAN.

Equation 12 determines a position of zero padding or DTX of the remaining bits after transmitting the information bits of the maximum data rate that can be transmitted from the PCPCH and the usage status information bits of each PCPCH used in the UTRAN to the CSICH. to be.

A second embodiment of arranging information bits is as follows.

In Equation 13, t corresponds to the number of dividing J bits by an intermediate variable. T in Equation 13 is less than or equal to R.

Equation (14) and Equation (15) are equations for determining in which position of the CSICH the bits indicating the maximum transmit rates can be transmitted.

Equation (16) and Equation (17) are equations for determining in which position of the CSICH to transmit a bit indicating usage status information of each PCPCH used in the UTRAN.

Equation (18) is a formula for determining the position of zero-padding or DTX the remaining bits after transmitting the information bits for the maximum data rate that can be transmitted from the PCPCH and the usage status information bits of each PCPCH used in the UTRAN to the CSICH. to be.

A third embodiment of arranging information bits is as follows.

Equation 19 is a formula for determining in which position of the CSICH to transmit a bit indicating the use status information of each PCPCH used in the UTRAN.

Equation (20) is an equation for determining in which position of the CSICH to transmit a bit indicating a maximum data rate that can be transmitted.

Equation (21) shows a position for zero-padding or DTX the remaining bits after transmitting the information bits of the maximum data rate that can be transmitted from the PCPCH and the information bits of the usage status information of each PCPCH used in the UTRAN to the CSICH. The formula to determine.

A fourth embodiment of arranging information bits is as follows.

Equation 22 is a formula for determining in which position of the CSICH to transmit a bit indicating usage status information of each PCPCH used in the UTRAN.

Equation 23 is a formula for determining in which position of the CSICH to transmit a bit indicating the maximum data rate that can be transmitted.

Equation (24) determines a position to zero-fade or DTX the remaining bits after transmitting the information bits for the maximum data rate that can be transmitted from the PCPCH and the bits for the usage status information of each PCPCH used in the UTRAN to the CSICH. Is a formula.

A fifth embodiment of arranging information bits is as follows.

In Equation 25, m is an intermediate variable.

Equation 26 is a formula for determining in which position of the CSICH to transmit a bit indicating the maximum data rate that can be transmitted.

Equation (27) and Equation (28) are equations for determining in which position of the CSICH to transmit bits indicating usage status information of each PCPCH used in the UTRAN.

Equation (29) and Equation (30) are zero bits remaining after transmitting information bits for the maximum data rate that can be transmitted from the PCPCH and bits for the usage status information of each PCPCH used in the UTRAN to the CSICH. This formula determines the position of fading or DTX.

In an embodiment of methods of simultaneously transmitting information on the maximum data rate available in the PCPCH of the UTRAN and usage state information of each PCPCH used in the UTRAN, a persistence value or a PCPCH in the UTRAN may be used instead of the information on the maximum rate. It may also send a value regarding the available NF_Max.

In the method of transmitting using the separate encoding method, information indicating a status indicator (hereinafter, referred to as "SI") transmitted to the CPICH may be encoded and transmitted using an error correcting code. Encoding and transmitting the SI is to increase reliability. The method of encoding and transmitting the SI is to encode SI information bits using an error correcting code, input 8 encoded symbols into an access slot of an access frame, and then transmit a total of 120 encoded symbols per access frame. do. In this case, the number of SI information bits, the meaning of each state information, and a transmission method may be previously determined by the UTRAN and the UE, and may be transmitted as a system parameter through a BCH (Broadcasting channel). Accordingly, the UE also knows the number of SI information bits and a transmission method in advance, and decodes the CSICH signal received from the UTRAN.

5 illustrates an encoder of a CSICH for transmitting SI bits according to an embodiment of the present invention.

First, the UTRAN determines the maximum data rate to be transmitted to the CSICH channel by checking the usage state of the current reverse CPCH channel, that is, the data rate and channel state of the channel received through the current reverse channel, as shown in Table 1 above. Outputs The information bits are input bits shown in Table 2 below.

The method of coding the input bits may vary depending on the method of transmission. In other words, will the channel status information be reported in units of frames? Or it may differ depending on whether you want to inform by slot. For example, the case of transmitting in units of frames first. The input information (SI bits) and the control information for the number of SI bits are simultaneously input to the iterator 501. The iterator 501 repeats the SI bits according to the control information for the number of SI bits. However, the control information on the number of SI bits does not require input to the UE when the UTRAN and the UE know the number of bits of the input information in advance.

An example of the operation of the CSICH encoder shown in FIG. 5 is as described below. When three SI bits S0, S1, S2 are input to the repeater 501, the repeater 501 repeats the input SI bits according to control information that the number of bits of the SI is three, so that S0, S1, S2, S0, S1, Outputs 60 repeated bit strings of the form S2, ..., S0, S1, S2. Then, the repeated 60 bit strings are input to the encoder 503 in units of 4 bits. The encoder 503 encodes the bits of the bit streams input in units of 4 bits by (8,4) Bi-orthogonal code to output 8 encoded symbols. When the 60 input bit strings are encoded in this manner, a total of 120 symbols are output from the encoder 503. Accordingly, the symbol from the encoder 503 can be transmitted in one frame when eight symbols are transmitted in one CSICH slot and transmitted in 15 slots.

In addition, if the input is 4 bits, the input 4 bits are repeated 15 times in the repeater to output 60 symbols, and the 60 symbols output in 4 bit units output 8 orthogonal codes of each symbol to output each slot. It is also possible to send to. In this case, it is the same as removing the iterator at the time of implementation and outputting the 4 bits of the orthogonal code of 8 symbols to transmit the same orthogonal code in every slot (15 slots).

Even if the input is 3 bits and the (8, 3) encoder is used, the repeater is meaningless. Therefore, in the implementation, except for the repeater shown in FIG. The same coded symbol may be transmitted in a slot (15 slots).

As in the above-described example, if the same symbol can be transmitted in every slot, the UTRAN can transmit CPCH channel state information to the UE on a slot basis. That is, the UTRAN may determine the maximum data rate to be transmitted to the UE in units of slots, determine the input bit corresponding to the determined maximum data rate, and inform the unit of the slot. In this case, since the UTRAN needs to know the data rate and status of the current reverse channel in every slot unit, it is also possible to transmit the maximum data rate every several slots.

At this time, the error correcting code (8,4) Bi-orthogonal code used for encoding has a relationship between four bits of input bits and eight output symbols as shown in Table 2 below. .

Input bit Coded symbols 0000 0000 0000 0001 0101 0101 0010 0011 0011 0011 0110 0110 0100 0000 1111 0101 0101 1010 0110 0011 1100 0111 0110 1001 1000 1111 1111 1001 1010 1010 1010 1100 1100 1011 1001 1001 1100 1111 0000 1101 1010 0101 1110 1100 0011 1111 1001 0110

FIG. 6 shows the structure of a CSICH decoder corresponding to the configuration shown in FIG.

Referring to FIG. 6, the input is 3 bits first, and the input 3 bits are repeated 20 times to make 60 bits. The 60 bits generated by the repetition are input to the decoder in units of 4 bits. Assuming that the decoder is a decoder for an encoder using a (8,4) quadrature encoder, when the received signal is inputted to the correlation calculator 601 by eight symbols, the received signal and the (8,4) quadrature coder Since the correlation is calculated and output, each correlation value for the 16 types in <Table 2> is output.

The output correlation is input to a Likelihood Ratio (LLR) calculator 603 and P0 and 1, which are the probability that the decoding bits for each of the 4 bits of the information bits transmitted from the UTRAN are 0 according to the control information determined by the number of SI bits. The ratio of P1, which is one probability, is calculated and 4 bits are output. The LLR value is then input to an LLR value accumulator 605. When 8 symbols are input in the next slot, the above process is repeated to add 4 bits output from the LLR calculator to the existing values. When all 15 slots are received by the above-described process, the UTRAN transmits the state information transmitted from the value stored in the LLR accumulator.

The decoder corresponding to the case in which the input is 4 or 3 bits and uses the (8,4) or (8,3) encoder, when the received signal is inputted to the correlation calculator 601 by 8 symbols each (8) , 4) or (8,3) Calculate the correlation with the orthogonal code and output it. In this case, when the state information is transmitted and received by the UTRAN every slot unit, the state information transmitted by the UTRAN is determined using the largest correlation value according to the correlation. If the UTRAN repeatedly transmits the same status information in units of 15 slots (one frame) or several slots, when the received signal is inputted to the correlation calculator 601 by 8 symbols, the received signal and the (8,4) ) Or (8,4) calculate the correlation with the orthogonal code and output the correlation value. The output correlation is input to a Likelihood Ratio (LLR) calculator 603, and P0, which is the probability that each bit of 4 or 3 bits of information bits transmitted from the UTRAN is 0 according to control information determined according to the number of SI bits. The RRL value is output by calculating the ratio of P1, which is the probability of 1. Then, the LLR value is inputted to the LLR value accumulator 605 again, and the above process is repeated for the next 8 received symbols to accumulate the LLR value to the existing value. The operation as described above will be performed for all symbols transmitted on one frame. That is, when 8 symbols are transmitted in one slot, 15 slots, that is, the above-described operation is repeated 15 times. Therefore, if the UTRAN repeatedly transmits the same state information, the LLR values finally accumulated by the aforementioned operation will be the same as the number of times the UTRAN repeatedly transmits. The UE determines the state information transmitted by the UTRAN based on the accumulated LLR values.

A second application example in which the performance of the method of encoding the information bits to be transmitted to the CSICH is improved as compared with the prior art of transmitting the information bits through the CSICH is as described below.

Assume that there are four information bits to be transmitted to the CSICH to help understand the embodiment of the present invention. The information bits are denoted S0, S1, S2, S3 in order. In the prior art, the information bits are simply transmitted repeatedly. That is, if 120 bits are transmitted in one frame, S0 is repeatedly transmitted 30 times, S1 is repeatedly transmitted 30 times, S2 is repeatedly transmitted 30 times, and the remaining S3 is repeatedly transmitted 30 times. Therefore, the problem in the prior art is that the UE can know the information of the required CPCH only after receiving one frame in order to obtain the required information.

In another embodiment of the present invention for solving the above-described problems, time diversity is obtained by changing the transmission order of the information bits, so that the UE can know the current CPCH state without receiving the CSICH of one frame. do. For example, if the transmission order of the information bits is S0, S1, S2, S3, S0, S1, S2, S3, S0, S1, S2, S3, ..., S0, S1, S2, S3, the additive white Gaussian Additive White Gaussian Noise (hereinafter referred to as " AWGN ") has the same sign gain in the environment. However, in a fading environment necessarily occurring in mobile communication, the gain of time diversity is improved, so that the code gain is better than that of the prior art. In addition, even if the UE receives only the CPICH slot (when the information bit is 4 bits or less), the state of the CPCH in the current UTRAN can be known. On the other hand, even when there are many information bits transmitted to the CPICH, it is possible to know information on the CPCH in the UTRAN faster than the prior art.

A third application example according to the present invention in which the performance is improved by encoding the information bits to be transmitted to the CSICH compared to the prior art of transmitting the information bits through the CSICH is as described below. The second method of transmitting the information bits of the CSICH described in the embodiment of the present invention is a method of transmitting bit by bit. That is, when there are 6 bits of information bits to be transmitted to the CSICH, and S0, S1, S2, S3, S4, and S5, respectively, are repeatedly transmitted in the order of the bits S0, S2, S3, S4, and S5. In contrast, the third method, which will be described below, relates to a method of transmitting information bits in symbol units.]

In the third method proposed in the present invention, the reason for transmitting information bits in symbol units is that in the case of AICH forward channel in the W-CDMA system, the I-channel and Q-channel are transmitted in the order of the information bits. Because. In addition, the present invention has a structure in which the same bit is repeated twice so that the same bit is transmitted when the information bits are transmitted in the I-channel and the Q-channel in the W-CDMA. It is intended to be used in.

As described above, the equation for transmitting the information bits of the CSICH in the repeated structure described above while transmitting the information bits of the CSICH in symbol units is as shown in Equation 31 below.

In Equation 31, N is the number of SI information bits, and in the current W-CDMA standard, N is 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60 as the value of N. Is proposing. m is a period of SI information bits repeatedly transmitted for one frame of CSICH, and 120, 60, 40, 30, 24, 20, 12, 10, 8, 6, 4, and 2 are proposed as m values in the W-CDMA standard. Doing. M is determined by N. N in Equation 31 is a value indicating the number of bits of the N SI information bits.

In Equation 31 Is the 2 (n + mN) th information bit, Has the same value as That is, the CSICH information bits are repeated twice with the same value. Meanwhile, in Equation 31, when the value of SIn is 1, it is mapped to -1, and when it is 0, it is mapped to 1. The mapped value may be reversed.

As an example of Equation 31, the case where N = 10 is described as an example, n has a value of 0 to 9, and m has a value of 0 to 5. SI ₀ = 1, SI ₁ = 0, SI ₂ = 1, SI ₃ = 1, SI ₄ = 0, SI ₅ = 0, SI ₆ = 1, SI ₇ = 1, SI ₈ = 0, SI ₉ = 1, b ₀ = -1, b ₁ = -1, b ₂ = 1, b ₃ = 1, b ₄ = -1, b ₅ = -1, b ₆ =- 1, b ₇ = -1, b ₈ = 1, b ₉ = 1, b ₁₀ = 1, b ₁₁ = 1, b ₁₂ = -1, b ₁₃ = -1, b ₁₄ = -1, b ₁₅ =- The values 1, b ₁₆ = 1, b ₁₇ = 1, b ₁₈ = -1, and b ₁₉ = -1 can be obtained. The values are repeated six times in one frame of CSICH. That is, it repeats on the basis of b ₀ = -1, b ₂₀ = -1, b ₄₀ = -1, b ₆₀ = -1, b ₈₀ = -1 and b ₁₀₀ = -1.

31 is a view according to the embodiment of the present invention.

Referring to FIG. 31, the repeater 1 3101 of FIG. 31 maps the input SI information bits 0 and 1 to +1 and -1 and outputs the mapped values. Meanwhile, the mapped SI bits are repeated by Equation 20 described above with respect to the iterator 1 3101. The mapped and repeated SI bits are input to Repeater 2 3103 of FIG. 31. The repeater 2 3103 repeatedly transmits the output from the repeater 1 3101 according to the control information on the number of SI information bits input. The number of repetitions is 120 / 2N. 31, there is no repeater 1 3101, which is an example of a hardware structure diagram for a second application example in which the performance of the encoding method of the information bits to be transmitted to the CSICH is improved compared to the above-described conventional technology. Also, if both repeaters 1 3101 and repeaters 2 3103 are used, this is an example of a hardware structure diagram for a third method of encoding information bits to be transmitted to the CSICH.

In the prior art, since information on the status of each CPCH used in the UTRAN is transmitted to the CSICH, the UTRAN cannot transmit the information in one CSICH slot, but is divided into all slots of one frame. Therefore, in order to know the current situation of CPCH in the UTRAN, the UE intending to use the CPCH must receive the CSICH for a much longer time than the embodiment of the present invention. Information is also needed. However, in the embodiment of the present invention, regardless of the number of CPCHs used in the UTRAN, the maximum data rate that can be supported by the CPCH and the number of multi-codes that can be used per CPCH when multiple codes are used are transmitted. 4 bits can be represented regardless. In the description of FIG. 5 and FIG. 6, one information bit is used for the use of multiple codes, but the number of frames NFM (Number of Frame Max: hereinafter referred to as "NF_MAX") that can transmit the maximum CPCH message is referred to. In order to allocate information bits. The NFM may be set to one UTRAN per CPCH SET. Alternatively, the NFM may correspond to a CA. In addition, it is possible to correspond to the downlink DPCCH. Meanwhile, in order for the UE to select an NFM, it may correspond to an AP or an AP subchannel. There may be various ways of configuring and informing the NF_MAX in the UTRAN and the UE. As an example of the method, the UTRAN may set one NF_MAX per CPCH SET and may set several NF_MAX per CPCH SET. In case of configuring the plurality of NF_MAX, each NF_MAX can be directly selected by the UE by a combination of an AP signature and an AP subchannel selected by the UE and transmitted to the UTRAN.

Another method of configuring NF_MAX is a method in which UTRAN directly informs UE about NF_MAX by mapping NF_MAX to a channel allocation message, and another method of configuring NF_MAX may correspond to DL_DPCCH corresponding to a reverse CPCH. have. Alternatively, you can use SuperVision without using NFM. That is, if there is no data to send, the UE stops transmitting and the UTRAN detects this and releases the channel. As another method, it is possible to inform the NFM of the NFM by using the downlink DPDCH.

AP / AP-AICH

The subscriber station that has received the information on the CPCH in the current UTRAN through the CSICH of FIG. 4A and FIG. 4B prepares to transmit the AP 333 of FIG. 3 to obtain information on channel usage rights and CPCH channel usage for the CPCH.

In order to transmit the AP 333 of FIG. 3, the subscriber device must select a signature for the AP. In an embodiment of the present invention, the information about the CPCH in the UTRAN obtained through the CSICH and the subscriber device through the CPCH are acquired before the signature is selected. Based on the nature of the data to be transmitted, an appropriate access service class may be selected. A simple example of the ASC may be distinguished according to the class of the subscriber device that the subscriber device intends to use, may be distinguished according to the data rate used by the subscriber device, or may be distinguished according to the type of service used by the subscriber device. . The ASC is transmitted to a subscriber device in the UTRAN through a broadcasting channel, and the subscriber device selects an appropriate ASC according to the CSICH and the nature of data to be transmitted. The subscriber station that has selected the ASC arbitrarily selects one of the CPCH AP subchannel groups defined in the ASC, and uses a system frame number (hereinafter referred to as "SFN") used for a frame transmitted from the UTRAN. If the SFN of the frame transmitted in the current UTRAN is defined as K using Table 3 below, an access slot usable in the K + 1 and K + 2th frames is derived, and one of the derived access slots is arbitrarily selected. Is used to transmit the 331 AP of FIG. 3. The AP subchannel group means a subset of 12 subchannels in Table 3 below.

Subchannel number SFN mod 8 0 One 2 3 4 5 6 7 8 9 10 11 0 0 One 2 3 4 5 6 7 One 8 9 10 11 2 12 13 14 3 0 One 2 3 4 5 6 7 4 9 10 11 12 13 14 8 5 6 7 0 One 2 3 4 5 6 3 4 5 6 7 7 8 9 10 11 12 13 14

The structure of the access slot used to transmit the 331 AP of FIG. 3 is shown in FIG. 7. In FIG. 7, 701 is an access slot and has a length of 5120 chips. The access slot has a structure of repeating 0 to 14 times and has a repetition period of 20 ms. 7 is a diagram illustrating the beginning and the end of access slots 0 to 14, respectively. Referring to FIG. 7, the beginning of the access slot 0 is the same as the start of the frame in which the SFN is even since the SFN is in units of 10 ms, and the end of the access slot 14 is the same as the end of the frame in which the SFN is odd.

The subscriber station configures AP 331 of FIG. 3 by arbitrarily selecting one of CPCH subchannel groups and valid signatures defined in the ASC selected by the subscriber station or assigned in the UTRAN in the same manner as described above. Send to UTRAN in time. When the AP 331 of FIG. 3 is classified according to the AP signature used for the AP, each signature may be mapped to the maximum data rate or the maximum data rate and the NFM may be mapped. Is the maximum data rate or the number of frames of data to be transmitted by the subscriber device or a combination of the two pieces of information. Although the combination of the maximum data rate and the number of data frames to be transmitted by the CPCH may be mapped to the AP signature, the maximum data rate and NF_MAX may be a combination of an access slot for transmitting an AP created by the AP signature and the subscriber device using the AP signature. May be sent to the UTRAN. As an example of the method, the AP signature selected by the subscriber device corresponds to the subscriber device to indicate the maximum transmission rate or spreading factor of data to be transmitted to the CPCH, and the access subchannel to which the subscriber device transmits the AP created by using the signature. Can correspond to NF_MAX and vice versa.

For example, the subscriber station transmits the AP to the UTRAN. For example, when the subscriber station transmits the AP 331 of FIG. 3, the subscriber station transmits the AP to the UTRAN. After receiving the signal and confirming whether there is a response to the AP signature transmitted by the subscriber device, if there is no response or NAK, the transmission power of the AP is increased to UTRAN as shown in 335 of FIG. 3. In the description of FIG. 3, when the UTRAN receives the AP 335 and the CPCH having the transmission rate requested by the subscriber device is possible, the UTRAN transmits the AP-AICH 303 to the subscriber device after the previously scheduled time 302 in response to the received AP 335. do. In this case, if the capacity of the reverse link of the UTRAN is exceeded or there is no more demodulator, the NAK signal is transmitted to temporarily stop the reverse common channel transmission of the subscriber station. In addition, if the UTRAN does not detect the AP, since it cannot send an ACK signal or a NAK to the AICH such as AP_AICH 303, it is assumed that nothing is transmitted in the embodiment of the present invention.

CD

When the subscriber device receives the ACK through the AP_AICH 303 of FIG. 3, the subscriber device transmits the CD_P to the reverse link. The structure of the CD_P is the same as that of the AP, and the signature used to configure the CD_P may be selected from the same set of signatures as the set of signatures used for the AP. As described above, when the signature used for the CD_P is used among the same signature set as the AP, the scrambling code used for the AP and the CD_P is differently used to distinguish the AP and the CD_P. The scrambling code may be used with the same initial value but different starting points, or may be used for the AP and CD_P, respectively. The reason why the CD_P is transmitted by selecting a random signature as described above is to reduce the probability of selecting the same CD_P even if two or more subscriber devices transmit an AP. In the prior art, a method of reducing the probability of collision of reverse links between different subscriber apparatuses by using a single CD_P and arbitrarily transmitting time is used. If the same CD_P is requested by the UTRAN to use CPCH, even if it fails to respond or responds to the subscriber device that transmitted the CD_P later, there is a possibility that the reverse link collides with the subscriber who transmitted the CD_P first.

In FIG. 3, the UTRAN transmits CD / CA-ICH 305 in response to CD_P 337 transmitted by the subscriber device. If the CD-ICH is described first among the CD / CA-ICH, the CD-ICH is a channel for transmitting an ACK for the CD_P to the subscriber apparatus by transmitting a signature used in the CD_P transmitted by the subscriber apparatus on the forward link. . The CD-ICH may be spread using an orthogonal channel code different from that of the AP-ICH. Thus, the CD-ICH and AP-ICH may be transmitted on different physical channels, and time-division of one orthogonal channel The CD-ICH may be transmitted through the same channel as the AP-ICH.

An embodiment of the present invention describes a case of transmitting the CD-ICH on a physical channel different from the AP-AICH. That is, it is assumed that the CD-ICH and the AP-ICH are spread with an orthogonal spreading code having a length of 256 and are transmitted on independent physical channels.

CA

In 305 of FIG. 3, the CA-ICH includes channel information of a CPCH allocated by the UTRAN to a subscriber device and information on allocation of a forward channel allocated for power control of the CPCH. The forward link allocated for the control of the CPCH is possible in various ways.

The first is to use a forward shared power control channel. As described above, the method of controlling the power of the channel using the common power control channel may use the method of Korean Patent Application No. 1998-10394 filed by the present applicant. In addition, the power control command for the CPCH may be transmitted using the common power control channel. The forward channel assignment may include channel number and timeslot information of forward common power control used for power control.

Secondly, the forward control channel can use time-divided channels with messages and power control commands. The W-CDMA system has already defined this channel for the control of the downlink shared channel. Even when data and power control commands are time-divided and transmitted, the channel information includes channel numbers and timeslot information of the forward control channel.

Third, one channel in the forward direction may be allocated for control of the CPCH. Through this channel, power control commands and control commands may be transmitted together. In this case, the channel information is the channel number of the forward channel.

In the embodiment of the present invention, it is assumed that the CD / CA-ICH is transmitted simultaneously in time, but after transmitting the CD-ICH, the CA-ICH may be transmitted. It may be transmitted in another channel code or in the same channel code. In addition, it is assumed that the channel assignment command transmitted through the CA-ICH is transmitted in the same form as the CD-ICH in order to reduce the delay in processing the upper layer message. In this case, if there are 16 signatures and 16 such CPCHs, each CPCH corresponds to one signature each. For example, when the base station wants to allocate a CPCH for transmitting a message by the terminal, if it wants to allocate a CPCH 5, the base station transmits a fifth signature corresponding to the channel assignment command.

In the description of 305 CD / CA-ICH of FIG. 3, it is assumed that the frame of the CA-ICH to which the channel allocation command is transmitted is composed of 15 slots having a length of 20 ms. This structure is the same as that of the AP_ICH and the CD-ICH. The frame for transmitting the AP-ICH and the CD-ICH may consist of 15 slots, and one slot may include 20 symbols. It is assumed that the length of one symbol is 256 in length, and that the part where a response to the AP, CD, and CA is transmitted is transmitted only in 16 symbol periods.

Accordingly, the channel assignment command transmitted as shown in FIG. 3 may consist of 16 symbols, each symbol having a length of 256 chips. Each symbol is multiplied by one bit of the signature and a spreading code and transmitted on the forward link, thereby ensuring orthogonality between the signatures.

In the embodiment of the present invention, not only one but also two or four signatures used for the channel allocation command in the CA-ICH transmission in the 305 CD / CA-ICH of FIG. 3 may be used.

In FIG. 3, the subscriber station receives the CD / CA-ICH 305 transmitted by the UTRAN, checks whether an ACK response has been received from the CD-ICH, and interprets information on the use of the CPCH channel transmitted to the CA-ICH. The two pieces of information may be interpreted sequentially or simultaneously. Upon receiving the CD / CA-AICH 305 and receiving the ACK by the CD-ICH and receiving the channel allocation information by the CA-ICH, the subscriber device configures the CPCH data unit 343 and the control unit 341 according to the CPCH channel information allocated by the UTRAN. The power control preamble PC_P 339 is transmitted to the UTRAN after a predetermined time after receiving the CD / CA-ICH set before the CPCH setting operation, before transmitting the data unit and the control unit of the CPCH.

PC_P

The length of the power control preamble is 0 or 8 slots, but in the embodiment of the present invention, it is assumed that the power control preamble PC_P 339 transmits 8 slots. The primary purpose of the power control preamble is to allow the UTRAN to initially set the reverse link transmission power of the subscriber station using the pilot field of the power control preamble, but in the embodiment of the present invention, Can be used for reconfirmation of channel assignment messages. The reason for the reconfirmation is to prevent a case in which an error occurs in the CA-ICH received by the subscriber device and the subscriber device incorrectly sets the CPCH and collides with the CPCH used by another subscriber device. When the power control preamble is used for the purpose of reconfirmation, the length of the power control preamble is 8 slots.

The method of reconfirming in the above description is a method of transmitting a signature of the CA-ICH received by the subscriber device in a 1: 1 correspondence to the pilot bits of the power control preamble, and transmitting the received CA signature to the power control preamble at the chip level. A method of channel spreading and transmitting a power control preamble with a channel code corresponding to the received CA signature, by using a CA signature and a channel code used for PC_P in a 1: 1 manner, and used for CA-signature and PC_P. The reverse scrambling code corresponds to 1: 1, and the power control preamble is spread and transmitted using the reverse scrambling code corresponding to the received CA signature.

Although the method of reconfirming the CA message is used for the power control preamble, since the UTRAN already knows the pattern of pilot bits used for the power control preamble, there is no difficulty in checking the power measurement and the CA message.

At about the same time as the transmission time of the power control preamble 339 of FIG. 3, the UTRAN starts transmitting a downlink dedicated channel for reverse power control of the CPCH of the subscriber station. The channel code of the downlink dedicated channel is transmitted to the subscriber station through a CA message. The downlink dedicated channel includes a pilot field, a power control command field, and a message field. The message field is transmitted only when there is data that the UTRAN should transmit to the subscriber device. 3, 307 is a reverse power control command field, and 309 is a pilot field.

In FIG. 3, when the power control preamble 339 is used not only for the purpose of power control but also for reconfirmation of the CA message, the CA message transmitted to the power control preamble interpreted by the UTRAN and the message transmitted by the UTRAN to 305 of FIG. 3 are different. In this case, the UTRAN continuously transmits a reverse link transmission power lowering command to a power control field of a configured downlink dedicated channel, and transmits a CPCH transmission stop message on a set FACH or a downlink dedicated channel.

In FIG. 3, the subscriber station transmitting the power control preamble 339 transmits a CPCH message part immediately after the transmission of the power control preamble. If the CPCH transmission stop command is received from the UTRAN during the transmission of the CPCH message part, the subscriber station immediately stops the transmission of the CPCH. If the CPCH transmission stop command is not received, the subscriber station terminates the transmission of the CPCH. Receive a NAK.

Scrambling code structure

FIG. 8A illustrates a structure of a reverse scrambling code used in the prior art, and FIG. 8B illustrates a structure of a reverse scrambling code used in the present invention. FIG. 8A illustrates a structure of a reverse scrambling code used during CPCH initial setup and transmission in the prior art. 8A of FIG. 8A is a reverse scrambling code used for an AP, and 803 is a reverse scrambling code used for a CD_P. The reverse scrambling code used for the AP and the reverse scrambling code used for the CD_P are reverse scrambling codes generated from the same initial value, and are used in the AP part from the 0th value to the 4095th value, and in the CD_P part from the 4096th value to 8191 Up to the first value. The reverse scrambling code used for the AP and CD_P may use a backward scrambling code that is broadcast by UTRAN or set in advance in the entire system. In addition, the reverse scrambling code may use a 256-length sequence and may use a long code that does not repeat during the AP or CD_P period. The same reverse scrambling code may be used in the AP and CD_P of FIG. 8A. That is, a certain portion of the reverse scrambling code generated using the same initial value can be used for the AP and the CD_P. In the case described above, a signature set having a different signature for the AP and a signature for the CD_P are used. When is selected. In the above example, eight of the 16 signatures used for the random access channel are used as AP signatures, and the remaining eight are allocated as CD_P signatures.

Scrambling code structure

805 and 807 of FIG. 8A are reverse scrambling codes used for the message parts of the power control preamble PC_P and CPCH, respectively, and different parts used in the reverse scrambling codes having the same initial value are used for the message parts of PC_P and CPCH. The reverse scrambling code used for the PC_P portion and the message part portion of the CPCH may be the same scrambling code as the reverse scrambling code used for the AP and CD_P, and also has a one-to-one correspondence with a signature transmitted from the subscriber station in the AP. Can be a scrambling code. Referring to 805 of FIG. 8A, the PC_P portion uses the 0 th value to the 20479 th value of the reverse scrambling code #b. Referring to 807, the CPCH message part ends with the 20480 th value starting from the reverse scrambling code. The value uses the scrambling code of total length 38400 using the 20479th value. The scrambling code used for the message parts of the PC_P and CPCH may also use a scrambling code having a length of 256.

8B is a diagram illustrating the structure of a reverse scrambling code used in the present invention. The reverse scrambling code used in 811 and 813 of FIG. 8B is used in the same manner as the reverse scrambling code for the AP and CD_P in the prior art, and is known to the subscriber apparatuses in the UTRAN by the UTRAN or the dictionary in the entire system. Use a reverse scrambling code as promised.

8B of FIG. 8B indicates a reverse scrambling code used for the PC_P portion. The reverse scrambling code used in the PC_P portion may be the same scrambling code as the reverse scrambling code used in the AP and CD_P or may be a scrambling code corresponding to the signature used in the AP in one-to-one correspondence. 8B of FIG. 8B is a value from 0 to 20479th of the scrambling code used for the PC_P part. 8B of FIG. 8B is a reverse scrambling code used for the message portion of the CPCH, and the scrambling code uses the same code as the scrambling code used for PC_P or one-to-one correspondence with the scrambling code used for the PC_P or used for the AP. You can use a scrambling code that matches one-to-one with a signature. The message portion of the CPCH uses a scrambling value of length 38400 from the 0th value to the 38399th value of the generated scrambling code.

All of the scrambling codes used in the description of the scrambling code structure of the present invention have been described using long scrambling codes that are not repeated during the AP, CD_P, PC_P, and CPCH message parts, but the use of scrambling codes having a short length of 256 is given. It is also possible.

AP Details

9A and 9B illustrate a channel structure and a generation structure of a CPCH access preamble AP according to the present invention. 9A is a channel structure of an AP, and FIG. 9B is a generation structure of one slot of an AP. 901 of FIG. 9A shows the length of the AP. In 901 of FIG. 9A, the AP repeats the selected signature among the AP signatures 256 times in one slot. The signature 903 for the AP is an orthogonal code of length 16. The k of 903 of FIG. 9A may be 0 to 15. That is, it is assumed that there are 16 kinds of signatures. An example of the AP signature of FIG. 9A is shown in Table 4 below. When the subscriber station selects the 903 signature of FIG. 9A, the CPCH status indicator channel (hereinafter referred to as "CSICH") transmitted by the UTRAN may support one CPCH and the maximum data rate supported by the CPCH in the UTRAN. Check the number of multiple codes that can be used in the network, select the appropriate access service class by considering the characteristics, data rate, and transmission length of data to be transmitted through CPCH, and then select the subscriber among the signatures defined in the ASC. Choose the signature that is appropriate for your device.

n Signature 0 One 2 3 4 5 6 7 8 9 10 11 12 13 14 15 P ₀ (n) A A A A A A A A A A A A A A A A P ₁ (n) A -A A -A A -A A -A A -A A -A A -A A -A P ₂ (n) A A -A -A A A -A -A A A -A -A A A -A -A P ₃ (n) A -A -A A A -A -A A A -A -A A A -A -A A P ₄ (n) A A A A -A -A -A -A A A A A -A -A -A -A P ₅ (n) A -A A -A -A A -A A A -A A -A -A A -A A P ₆ (n) A A -A A -A -A A A A A -A A -A -A A A P ₇ (n) A -A -A A -A A A -A A -A -A A -A A A -A P ₈ (n) A A A A A A A A -A -A -A -A -A -A -A -A P ₉ (n) A -A A -A A -A A -A -A A -A A -A A -A A P ₁₀ (n) A A -A -A A A -A -A -A -A A A -A -A A A P ₁₁ (n) A -A -A A A -A -A A -A A A -A -A A A -A P ₁₂ (n) A A A A -A -A -A -A -A -A -A -A A A A A P ₁₃ (n) A -A A -A -A A -A A -A A -A A A -A A -A P ₁₄ (n) A A -A A -A -A A A -A -A A -A A A -A -A P ₁₅ (n) A -A -A A -A A A -A -A A A -A A -A -A A

In FIG. 9B, 905 is the same as 901, and an uplink scrambling code 907 and a code in which the signature is repeated 256 times are calculated in a chip unit through a multiplier 906 and then transmitted to the UTRAN. The time point at which the AP is transmitted is described in FIG. 7 and <Table 3> in the description of the embodiment of the present invention, and the description of the scrambling code 907 is described in detail with reference to FIG. 8B.

The information transmitted by the subscriber station to the UTRAN through the AP of FIG. 9b may be a transmission rate of the CPCH required by the subscriber device or the number of frames to be transmitted by the subscriber device, or a combination of the two pieces of information may be generated in one-to-one correspondence with a signature. Information.

In the prior art, the information transmitted by the subscriber device to the UTRAN through the AP includes information on a reverse scrambling code, a transmission rate, a channel code of a downlink dedicated channel for CPCH power control, a data transmission rate, and the number of frames of data to be transmitted. The subscriber equipment determined and sent the corresponding signature to the UTRAN through the AP. When the information transmitted through the AP is determined in the above manner, the role of the UTRAN is only a role of permitting or prohibiting use of a channel required by the subscriber device, so even if an available CPCH exists in the UTRAN, the subscriber device does not have to use it. There is a disadvantage that can not be assigned to, and when there are many subscriber devices that require CPCH with the same conditions, collision occurs for acquiring CPCH between different subscriber devices, resulting in a longer time for the subscriber device to acquire a channel. . In the embodiment of the present invention, the subscriber station transmits only the maximum data rate that can be transmitted in CPCH or the maximum data rate and the number of frames of data to be transmitted to the UTRAN, and uses a CPCH such as a reverse scrambling code and a downlink dedicated channel channel through a CA. Since the UTRAN determines other information and can add a CPCH right to the subscriber device, it is possible to flexibly and efficiently allocate CPCH in the UTRAN.

If the UTRAN supports the transmission of multi-channel codes using multiple multi-channel codes in one PCPCH, the AP signature used for the AP signature in the transmission of the AP may refer to the scrambling code used for the transmission of the multi-code. In this case, the subscriber device may indicate the number of multiple codes desired by the subscriber device when the subscriber device can select how many multiple codes to use in the PCPCH. If the AP signature indicates a multi-signal reverse scrambling code, the channel assignment message transmitted by UTRAN to the subscriber device may indicate the number of multiple codes to be used by the subscriber device, and the AP signature may indicate the number of multiple codes that the subscriber device wants to use. In the case of a number, the channel assignment message may indicate a reverse scrambling code to be used by the subscriber station for multiple code transmission.

CD_PDetailed Description

10A and 10B illustrate a channel structure and a generation structure of the collision detection preamble CD_P. The channel structure and generation structure of the CD_P are the same as the channel structure and generation structure of the AP of FIGS. 9A and 9B. FIG. 10A shows a channel structure of one slot of CD_P, and FIG. 10B shows a structure of generating one slot of CD_P. In FIG. 10B, the uplink scrambling code is different from the AP scrambling code as shown below in FIG. 8B. 10A of FIG. 10A shows the length of the CD-P. The CD-P signature may be the same as the 16 signatures for the AP with the orthogonal code 1003 of length 16, and the CD-P signature obtained in the same way as described below to obtain the CA signature is used. Can be. In 1001 of FIG. 10A, the CD is arbitrarily selected from one of the CD-P signatures shown in Table 4 and repeated 256 times in one slot. J of 1003 of FIG. 10 may be from 1 to 16. That is, 16 kinds of signatures may be used for CD_P. The signature for CD_P of 1003 of FIG. 10A is randomly selected from one of 16, and the reason for the random selection is once again confirmed by the UTRAN in order to prevent a collision between subscriber stations receiving the ACK by transmitting the same AP to the UTRAN. To go through the process. In using the 1003 signature of FIG. 10A, the conventional technology defines and uses a single signature used for CD_P or uses a method used when transmitting an AP on a random access channel. The method of transmitting CD_P using only one signature is to prevent the collision between subscriber devices by randomly transmitting the CD_P instead of the same signature, but the disadvantage of this method is that UTRAN receives CD_P from one subscriber device. If another subscriber station transmits the CD_P when the ACK cannot be transmitted, the CD_P transmitted by the other subscriber device cannot be processed before the ACK for the received CD_P of the subscriber device is received. That is, the CD_P of other subscriber devices cannot be processed within the time of processing the CD_P of one subscriber device.

Therefore, the conventional method as described above has a disadvantage in that it takes a long time until the subscriber apparatus waits for an access slot capable of transmitting CD_P, and thus a large delay time may be generated until transmitting the CD_P.

In the embodiment of the present invention, the CD_P uses a method in which the subscriber station transmits a randomly selected signature to the UTRAN after a certain time after receiving the AP-AICH.

The 1005 of FIG. 10B is the same as 1001, and is calculated (spread) by the reverse scrambling code 1007 (the reverse scrambling codes 4096 to 8191) through the multiplier 1006 and then transmitted to the UTRAN. In FIG. 10B, the reverse scrambling code may use the same (0 to 4095 chip) as the scrambling code used by the AP. In this case, the signature may be distinguished using another. That is, if 12 signatures are used for the preamble of the random access channel among the 16 signatures, the remaining four signatures may be used for the AP of the CPCH and the CD-P. The time point at which the CD_P is transmitted is a certain time after receiving the AP_AICH, and the description of the scrambling code 1007 is described in detail with reference to FIG. 8B.

AP-AICH / CD / CA-ICHDetailed Description

FIG. 11A shows an Access Preamble Acquisition Indicator Channel (hereinafter referred to as "AP-AICH") that the UTRAN can respond with an ACK or NAK to an AP received by the UTRAN, and responds with an ACK or NAK to the received CD. Collision Detection Indicator Channel (hereinafter referred to as "CD-ICH") and a Channel Allocation Indicator Channel in which the UTRAN transmits a CPCH channel allocation command to the subscriber device in an embodiment of the present invention. Is a diagram showing a channel structure of " CA-ICH " hereinafter, and FIG. 11B is a diagram showing a generation structure.

11A of FIG. 11A illustrates a structure for transmitting an ACK, NAK, and no acquisition signal for an AP captured by the UTRAN to an AP-AICH message display unit. If the AP-AICH is transmitted, the portion 1105 after the display portion (signature transmission portion) 1101 transmits a CSICH signal. FIG. 11A is a diagram illustrating a structure for transmitting a CD / CA-ICH signal for transmitting a response to the CD-P signal and a channel assignment signal. However, at this time, the display portion 1101 AP-AICH and the channel structure is the same, and the transmitted signal is simultaneously transmitted a response signal (ACK, NACK or ACK, NACK, not captured) for the CD-P and a signal for CA. When the CD / CA-ICH is described with reference to FIG. 11A, the portion 1105 after the display portion (signature transmission portion) 1101 may be left blank or the CSICH may be sent. The AP-AICH and the CD / CA-ICH can be distinguished from each other because the channel code (OVSF code) is different by using the same scrambling code. The channel structure and generation structure of the CSICH are described in the description of FIGS. 4A and 4B. 11B of FIG. 11B shows a frame structure of an indicator channel (hereinafter referred to as "ICH"). As shown in 1111 of FIG. 11B, one frame of the ICH has a length of 20 ms and consists of 15 slots. In addition, each slot may transmit zero or more than one signature among the sixteen signatures of Table 4. 11B of FIG. 11B is the same as 1103 of FIG. 11A, and the channel code of AP-AICH, CD-ICH, and CA-ICH may be used for the 1109 channel code of FIG. 11B. In this case, the same channel code may be used for the CD-ICH and the CA-ICH. 11B of FIG. 11B is spread to the channel code 1109 through the multiplier 1108, and 15 of the spread slots are spread through the forward scrambling code 1113 and the multiplier 1112 in one ICH frame.

FIG. 12 is an ICH generator. It is assumed that an ICH generator capable of generating CD-ICH and CA-ICH commands. The structure for generating the AP-AICH is also the same. As described above, each slot of the ICH frame allocates a corresponding signature among the 16 signatures. Referring to 12, the multipliers 1201-1216 have corresponding signatures (orthogonal codes W ₁ -W ₁₆ ) as first inputs, and have corresponding capture marks AI1-AI16 as second inputs, respectively. Each of AI1 to AI16 may have a value of 1,0, -1 in the case of AP-AICH and in the case of CD-ICH, and in the case of AI = 1, it means ACK, and in case of -1, it means NAK. If 0, it means that the corresponding signature transmitted from the subscriber device could not be captured. Accordingly, the multipliers 1201-1216 multiply the corresponding orthogonal codes and the capture display AIs, respectively, and the adder 1220 adds the outputs of the multipliers 501-516 and outputs them as ICH signals.

The UTRAN may transmit a channel allocation command through the ICH generator in various ways.

How to Assign CA Channels

The first method is to allocate a channel of the forward link and transmit a channel assignment command. FIG. 13 is a diagram showing an implementation example of the first CA-ICH. FIG. 13 (a) is a diagram showing the structure of the slots of the CD_ICH and the CA-ICH, and FIG. 13 (b) is the CD / ICH. It is a figure which shows the example of CD / CA-ICH transmission which transmits CA-ICH. 13, reference numeral 1301 denotes a transmission slot structure of a CD-ICH for transmitting a response signal for CD_P, 1311 denotes a transmission slot structure of a CA-ICH for transmitting a channel assignment command, and 1331 denotes a transmission slot structure for transmitting a response signal for CD_P. The transmission frame structure of the CD-AICH, and 1341 is a structure of a frame for transmitting a channel assignment command through the CA-ICH with a tau time delay after transmitting the CD-ICH frame. 1303 and 1313 of FIG. 13 are parts used for CSICH. Advantages of such a case are as described below. Since the CD-ICH and CA-ICH have different channels of the forward link, they are physically separated. Therefore, if the AICH has 16 signatures, the same 16 signatures can be used in the CD-ICH and the same 16 signatures in the CA-ICH. In this case, the type of information that can be transmitted using the signature of the signature may be doubled. Therefore, if the +1 or -1 sign of the CA-ICH is used, 32 signatures can be written to the CA-ICH.

How to assign channels to multiple subscriber devices at the same time (need to move the location to the right place)

The following provides a method for allocating different channels to multiple users who requested the same type of channel. First, among subscriber devices in UTRAN, subscriber device # 1, subscriber device # 2, and subscriber device # 3 simultaneously send AP # 3 to UTRAN to request a channel corresponding to AP # 3. Suppose you asked. This assumption corresponds to the first column in Table 5 below. In this case, the UTRAN recognizes AP # 3 and # 5. At this time, UTRAN selects AP # 3 based on a predefined criterion, for example, by the ratio of AP reception power, and sends an ACK to # 3 and a NAK to # 5 using AP-AICH. This corresponds to the second column of Table 5 below. Subscriber devices that receive the ACK transmitted by the UTRAN become # 1, # 2, and # 3, and the subscriber devices generate CD_Ps arbitrarily. When generating the CD_P as described above, it is assumed that the subscriber devices generate CD_P # 6 for the subscriber device # 1, CD_P # 2 for the subscriber device # 2, and CD_P # 9 for the subscriber device # 3, respectively. As described above, when the CD_Ps transmitted by the respective subscriber stations are received in the UTRAN, the UTRAN recognizes that three CD_Ps are received. When the number of CPCHs requested by the subscriber stations in the UTRAN is three or more, # 2, # ACK is sent to 6 and # 9, and three channel assignment messages are sent to CA-ICH. In this case, when the UTRAN transmits a message for allocating channels # 4, # 6, and # 10 through the CA-ICH, the subscriber stations know the number of CPCH assigned to them through the following process. The subscriber station # 1 knows the signature of the CD_P that it has transmitted to the UTRAN, and knows that the number is six. As described above, even when the UTRAN transmits several ACKs to the CD-ICH, it can be seen how many ACKs have been transmitted. In the description of the embodiment of the present invention, the UTRAN transmits three ACKs to subscriber stations through the CD-ICH, and also transmits three channel assignment messages to the CA-ICH. The number of the channel assignment message transmitted as described above is # 4, # 6, # 10. In the subscriber device # 1 receiving both the CD-ICH and the CA-ICH as described above, three subscriber devices in the UTRAN simultaneously perform CPCH channels. It can be seen that the CPCH can be used as described in the second message # 6 of the channel assignment message transmitted through the CA-ICH according to the ACK order of the CD-ICH.

UE number AP number AP-AICH CD_P number (order) CA-AICH (order) One 3 # 3 ACK 6 (second) # 6 (second) 2 3 # 3 ACK 2 (first) # 4 (first) 3 3 # 3 ACK 9 (third) # 10 (third) 4 5 # 5 NAK

Through the above process, since the subscriber device # 2 sends CD_P # 2, the ACK response received by the CD-ICH is CD # 2, # 6, # 9. It can be seen that it is the first of the received ones, and the fourth of the three channel assignment messages transmitted by the CA-ICH is recognized as being assigned to itself. In the same manner, UE # 3 is allocated to channel 10. In this manner, multiple channels can be assigned to multiple users at the same time.

Channel allocation method (simultaneous transmission of CD-ICH / CA-ICH signals)

In the second method of simultaneously transmitting the CD-ICH / CA-ICH signal, the CD-ICH and CA-ICH are set by setting the transmission time difference tau of the CD-ICH frame and the CA-ICH frame to 0 in the embodiment of the first method. It is a method of transmitting simultaneously. In the current W_CDMA scheme, one symbol of the AP-AICH is transmitted using a spreading rate of 256, and 16 symbols are transmitted in one slot of the AICH. The CD-ICH and CA-ICH can be transmitted simultaneously by using symbols having different lengths. That is, a method of assigning orthogonal codes having different spread rates to CD-ICH and CA-ICH can be used. have. As an example of the second method, when a total of 16 signatures are used for CD_P and 16 CPCHs are allocated, 512 chip length channels may be allocated to CA-ICH and CD-ICH. In this case, 8 symbols of 512 chip length can be transmitted to each CD-ICH and CA-ICH, and 8 signatures orthogonal to each other are allocated and multiplied by a sign of + 1 / -1 to 16 total CA- The AICH and CD-AICH can be transmitted. The advantage obtained in this way is that a separate orthogonal code does not have to be assigned to a new CA-ICH.

As in the above-described example, the following method may be used to allocate an orthogonal code having a length of 512 chips to the CA-ICH and the CD-ICH. One 256-length orthogonal code Wi is allocated to CA-ICH and CD-ICH. The 512-length orthogonal code assigned to the CD-ICH is repeated Wi twice. That is, it is orthogonal code of length 512 of {WiWi}. The 512-length orthogonal code assigned to the CA-ICH is assigned to the orthogonal code of 512 chip length of {Wi-Wi}, which is made by connecting Wi's station to the CD-ICH and CA without additional orthogonal code assignment. ICH can be transmitted at the same time.

Referring to FIG. 14, a second example of the second method of simultaneously transmitting a CD-ICH / CA-ICH signal is a method of simultaneously transmitting a CD-ICH and a CA-ICH and allocating different channel codes having the same spreading rate. This is shown. In FIG. 14, 1401 and 1411 are CD-ICH and CA-ICH sections, respectively, and 1403 and 1413 have the same spreading rate of 256, but are different orthogonal channel codes. 1405 and 1415 of FIG. 14 indicate a CD-ICH frame and a CA-ICH frame including 15 access slots having a 5120 chip length.

The 1401 CD-ICH portion of FIG. 14 repeats a signature of length 16 twice in symbol units, and is generated by multiplying each signature symbol by 1, -1,0 indicating ACK, NAK, and not capturing. It is possible to send ACK and NAK for the three signatures. The 1401 CD-ICH unit is spread to the channel code 1403 through the multiplier 1402, becomes an access slot of the CD-ICH frame 1405, and is spread by the forward scrambling code 1407 at the multiplier 1406.

The 1411 CA-ICH of FIG. 14 is a signature that is repeated twice in symbol units to transmit a signature corresponding to a channel currently allocated among CA signatures having a length of 16 by I and Q. All signatures corresponding to not currently assigning channels are not multiplied by "0" and transmitted. The 1411 CA-ICH unit is spread to the channel code 1403 through the multiplier 1402, becomes a CA-ICH of one access slot of the CA-ICH frame 1415, and is spread to the forward scrambling code 1417 through the multiplier 1416 and transmitted.

FIG. 15 illustrates another method of using the second method, in which a CD-ICH and a CA-ICH are spread with the same channel code but can be simultaneously transmitted using different sets of signatures.

1501 in FIG. 15 uses a CA signature having a length of 16 as the CA-ICH portion. The CA signature is described below and can be referred to. 1501 of FIG. 15 is a signature obtained by repeating a signature corresponding to a channel currently allocated among CAs twice in symbol units. All signatures corresponding to not currently assigning channels are not multiplied by "0" and transmitted. In FIG. 12, the signature (orthogonal code) for allocating the current channel is output as it is, that is, multiplied by 1, and the remaining CA signature is not multiplied by 0. In this case, one CA system is used to allocate one CPCH. A method of allocating one CPCH channel using at least two CA signatures will be described. In FIG. 15, 1503 is a k-th CA-ICH unit and is a CA-ICH unit used when one channel of a CPCH is mapped to multiple CA signatures. The reason for using the method of mapping several CA signatures to one CPCH channel as described above is that when a CA-ICH is transmitted from the UTRAN to the subscriber device, a transmission error occurs and the subscriber device uses another CPCH not assigned by the UTRAN. This is to reduce the probability of occurrence. 1505 of FIG. 15 is a CD-ICH unit, and the physical structure is the same as that of CA-ICH. Even when transmitting at the same time, the subscriber device may not confuse the CD-ICH and the CA-ICH. The 1501 CA-ICH section # 1 and 1503 CA-ICH section #k of FIG. 15 are combined through a multiplier 1502 to form a CD-ICH section 1505, and the 1505 CD-ICH section has a CA-ICH section through a multiplier 1504. The sum is spread to the orthogonal channel code 1507 through the multiplier 1506, and becomes a display portion of one slot of the CD / CA-ICH. In this way, each slot is created so that 15 slots become 1509 CD / CA-ICH frames. The signal of each slot is calculated (spread) in a unit of chip with the corresponding portion of the forward scrambling code 1510 in the multiplier 1508 and transmitted to the subscriber device.

In the method of simultaneously transmitting the CD-ICH and the CA-ICH by setting the transmission time difference tau of the CD-ICH frame and the CA-ICH frame to 0, the AICH signature currently in progress in the WCDMA standard can be used as it is, and the AICH signature is used. Is shown in Table 4 above. In the case of CA-ICH, since the UTRAN assigns one channel of several CPCHs to the subscriber device, the receiver of the subscriber device should attempt to detect several signatures. In the conventional AP-AICH and CD-ICH, the subscriber station only needs to detect one signature. However, when using the CA-ICH used in the embodiment of the present invention, since the receiver of the subscriber device must attempt to detect all possible signatures, the signature structure of the signature of the AICH can be reduced to reduce the complexity of the receiver of the subscriber device. You need a way to design or place it.

As described above, among eight of the sixteen possible signatures, each signature is multiplied by +1 / -1 to obtain a CD signature for use on sixteen CDs and a CD-ICH. Suppose that among the remaining eight signatures, each signature is multiplied by +1 / -1 to obtain CD signatures for 16 CDs and CD-ICH.

The signature of AICH used in the W-CDMA standard is to use the Hadamard function. The Haramard function is made in the following form.

Hn = Hn-1 Hn-1

Hn-1 -Hn-1

H1 = 1 1

1 -1

Then, the HADAMARD function of length 16 required in the embodiment of the present invention is as follows. The signature generated by the HADAMARD function shown in Table 4 is a form in which the channel gain A of the AICH is multiplied, and the following signature is in the form of a signature before the channel gain A of the AICH is multiplied.

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 => S0

1 -1 1 -1 1 -1 1 -1 1 -1 1 -1 1 -1 1 -1 => S1

1 1 -1 -1 1 1 -1 -1 1 1 -1 -1 1 1 -1 -1 => S2

1 -1 -1 1 1 -1 -1 1 1 -1 -1 1 1 -1 -1 1 => S3

1 1 1 1 -1 -1 -1 -1 1 1 1 1 -1 -1 -1 -1 => S4

1 -1 1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 -1 1 => S5

1 1 -1 -1 -1 -1 1 1 1 1 -1 -1 -1 -1 1 1 => S6

1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 -1 1 1 -1 => S7

1 1 1 1 1 1 1 1 -1 -1 -1 -1 -1 -1 -1 -1 => S8

1 -1 1 -1 1 -1 1 -1 -1 1 -1 1 -1 1 -1 1 => S9

1 1 -1 -1 1 1 -1 -1 -1 -1 1 1 -1 -1 1 1 => S10

1 -1 -1 1 1 -1 -1 1 -1 1 1 -1 -1 1 1 -1 => S11

1 1 1 1 -1 -1 -1 -1 -1 -1 -1 -1 1 1 1 1 => S12

1 -1 1 -1 -1 1 -1 1 -1 1 -1 1 1 -1 1 -1 => S13

1 1 -1 -1 -1 -1 1 1 -1 -1 1 1 1 1 1 -1 -1 => S14

1 -1 -1 1 -1 1 1 -1 -1 1 1 -1 1 -1 -1 1 => S15

Eight of the above Hadamard functions are assigned to the CD-ICH and the remaining eight to the CA-ICH. At this time, the sequence of allocating the signature of CA-ICH is as follows, and the purpose is to make it possible to simply perform IFHT.

{S0, S8, S12, S2, S6, S10, S14}

The signature is then assigned to the CD-ICH as follows.

{S1, S9, S5, S13, S3, S7, S11, S15}

Here, the signature of CA-ICH is allocated from the left side. The reason for the allocation as described above is the reason for minimizing the complexity by enabling the FHT in the subscriber device. If the CA-ICH signature is selected from two, four, and eight signatures from the left, the number of A columns is the same as the number of -A except for the last column. Compared to the number of signatures used, the receiver structure of the subscriber unit is the simplest.

In addition, the signature may correspond to a forward channel or CPCH for CPCH control in another form. For example, the signature assignment used for CA-ICH is as follows.

[0, 8] => use up to two signatures

[0, 4, 8, 12] => use up to 4 signatures

[0, 2, 4, 6, 8, 10, 12, 14] => use up to 8 signatures

If all NUM_CPCH CPCHs are used (1 <NUM_CPCH <= 16), then the signature corresponding to the kth (k = 0, ...., NUM_CPCH-1) CPCH (or forward channel for control of CPCH) The + 1 / -1 sign to be multiplied is

CA_sign_sig [k] = (-1) [k mod 2]

Here CA_sign_sig sign_sig [k] is the sign of + 1 / -1 multiplied by the kth signature, and [k mod 2] is the remainder of k divided by 2. x is defined as a number representing the dimension of the signature used. That is, it can be expressed as follows.

x = 2 if 0 <NUM_CPCH <= 4

4 if 4 <NUM_CPCH <= 8

8 if 8 <NUM_CPCH <= 16

And the signature used is as follows.

CA_sig [k] = (16 / x) * + 1

here Is the largest integer not exceeding y. For example, show signature assignment when using four signatures.

S0 => 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

S4 => 1 1 1 1 -1 -1 -1 -1 1 1 1 1 1 -1 -1 -1 -1

S8 => 1 1 1 1 1 1 1 1 -1 -1 -1 -1 -1 -1 -1 -1

S12 => 1 1 1 1 1 -1 -1 -1 -1 -1 -1 -1 -1 1 1 1 1

As can be seen from the above, when the signature is allocated according to the method of the present invention, the Hadamard code of length 4 is repeated four times. Therefore, when receiving the CA-AICH at the subscriber device receiver, four repeated symbols may be added, and a length 4 of the FHT may be taken to greatly reduce the complexity of the subscriber device.

In addition, in the CA-ICH signature mapping, the signature number for each CPCH information may be added by adding one by one. In this case, two consecutive 2i, 2i + 1th symbols become opposite signs, but the subscriber station receiver can be regarded as the same implementation because the latter symbol needs to be subtracted from the preceding symbol of the two despread symbols.

On the contrary, the signature allocated to the CD-ICH may be allocated in the following order. The easiest way to create the signature of the k-th CD-ICH is to increment the signature number by one in the CA-ICH signature assignment above. Another way is to write

CD_sign_sig [k] = (-1) [k mod 2]

CD_sig [k] = 2 * + 2

That is, as described above, CA-AICH is sequentially allocated in the order of [1, 3, 5, 7, 9, 11, 13, 15].

In Fig. 16, there is a CA-AICH receiving device of a subscriber device for the signature structure. Referring to the operation of the receiver of the subscriber device having the structure as shown in FIG. Estimate the magnitude and phase of the channel. The multiplier 1617 multiplies the input signal by the Walsh Spreading code of the ICH channel, and the accumulator 1619 accumulates it for a predetermined symbol period (256 chips) and outputs the despread symbol. The despread ICH symbol is demodulated by multiplying the complex conjugate at the complex conjugate 1615 by the complex conjugate of the output of the channel estimator 1613. The output of the multiplier 1621 of FIG. 16 is multiplied and input to the FHT converter 1629. The FHT converter 1629 receives demodulated symbols as inputs and outputs a signal size for each signature. The control and determiner 1631 receives the output of the FHT converter 1629 and finds and determines the signature of the CA-ICH with the highest probability. In the present invention, the signature structure of the CA-ICH has been shown to simplify the structure of the receiver of the subscriber station by using the signature currently used in the W-CDMA standard. We propose a more efficient allocation method than the case used for ICH. The above allocation method is summarized as follows.

Generate 2K signatures 2K in length. (If you consider multiplying the sign by + 1 / -1, the number of possible signals can be 2K + 1.) However, if you use only some of the signatures instead of using the entire signature, In order to reduce the complexity, it is necessary to allocate them more efficiently. Suppose we use only M signatures out of all signatures. Here, 2L-1 <M <= 2L and 1 <= L <= K. In this case, M signatures having a length of 2K are used to repeatedly transmit each bit of the Hadamard function having a length of 2L by 2K-L times.

In addition, another method of transmitting the ICH is to use a signature different from the signature used for the preamble. The signature is shown in Table 6 below.

The second embodiment of the ICH signature of the present invention proposes an assignment in which the signature of the following Table 6 is used as it is and the subscriber station receiver can receive the CA-ICH with low complexity. Orthogonality is maintained between the signatures of the ICH. Therefore, if the signatures allocated to the ICH are efficiently arranged, the terminal can simply demodulate the CD-ICH through a method such as an Inverse Fast Hadamard Transform (IFHT).

Preamble symbol Signature P ₀ P ₁ P ₂ P ₃ P ₄ P ₅ P ₆ P ₇ P ₈ P ₉ P ₁₀ P ₁₁ P ₁₂ P ₁₃ P ₁₄ P ₁₅ One A A A -A -A -A A -A -A A A -A A -A A A 2 -A A -A -A A A A -A A A A -A -A A -A A 3 A -A A A A -A A A -A A A A -A A -A A 4 -A A -A A -A -A -A -A -A A -A A -A A A A 5 A -A -A -A -A A A -A -A -A -A A -A -A -A A 6 -A -A A -A A -A A -A A -A -A A A A A A 7 -A A A A -A -A A A A -A -A -A -A -A -A A 8 A A -A -A -A -A -A A A -A A A A A -A A 9 A -A A -A -A A -A A A A -A -A -A A A A 10 -A A A -A A A -A A -A -A A A -A -A A A 11 A A A A A A -A -A A A -A A A -A -A A 12 A A -A A A A A A -A -A -A -A A A A A 13 A -A -A A A -A -A -A A -A A -A v -A A A 14 -A -A -A A -A A A A A A A A A -A A A 15 -A -A -A -A A -A -A A -A A -A -A A -A -A A 16 -A -A A A -A A -A -A -A -A A -A A A -A A

Let's mark the nth signature as Sn and the nth signature multiplied by -1 as -Sn. An embodiment of the signature assignment to be proposed in the second embodiment of the ICH signature of the present invention is as follows.

{S1, -S1, S2, -S2, S3, -S3, S14, -S14,

S4, -S4, S9, -S9, S11, -S11, S15, -S15}

If the number of CPCHs is smaller than 16, the signatures are allocated to the CPCHs from the left. The reason for the above assignment is to minimize the complexity by enabling IFHT in the mobile station. If you select two, four, or eight signatures from the left out of {1, 2, 3, 14, 15, 9, 4, 11}, the number of A's and the -A's are the same except for the last column. . If you rearrange the order of each symbol and multiply it by an arbitrary mask, it has a structure of orthogonal codes for IFHT.

17 illustrates a structure of a receiver proposed in the second embodiment of the present invention.

The subscriber device despreads the input signal for 256 chip intervals to generate symbol Xi with channel compensation. When Xi is referred to as an i symbol input to the subscriber station receiver (a despread signal of 256 chip length), the position converter relocates it as follows.

Y = (X15, X9, X10, X6, X11, X3, X7, X1

X13, X12, X14, X4, X8, X5, X2, X0}

The multiplier 1725 multiplies the rearranged Y by the following mask generated in the mask generator 1725.

M = {-1, -1, -1, -1, 1, 1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1}

Then, the signatures of S1, S2, S3, S14, S15, S9, S4, and S11 are converted as follows. The converted signatures are referred to as S'1, S'2, S'3, S'14, S'15, S'9, S'4 and S'11, respectively.

S'1 = 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

S'2 = 1 1 1 1 1 1 1 1 1 -1 -1 -1 -1 -1 -1 -1 -1

S'3 = 1 1 1 1 1 -1 -1 -1 -1 -1 -1 -1 -1 1 1 1 1

S'14 = 1 1 1 1 1 -1 -1 -1 -1 1 1 1 1 1 -1 -1 -1 -1

S'15 = 1 1 -1 -1 1 1 -1 -1 1 1 -1 -1 1 1 -1 -1

S'9 = 1 1 -1 -1 1 1 -1 -1 -1 -1 1 1 -1 -1 1 1

S'4 = 1 1 -1 -1 -1 -1 1 1 -1 -1 1 1 1 1 -1 -1

S'11 = 1 1 -1 -1 -1 -1 1 1 1 1 -1 -1 -1 -1 1 1

As seen above, it can be seen that by reordering the input signals and multiplying a specific mask for each symbol, the signatures can be converted into a form of orthogonal code capable of IFHT. In addition, when performing the IFHT, there is no need to perform the IFHT for the length 16, and if the repeated symbols are added to the IFHT and then the complexity of the receiver can be further reduced. That is, when 5-8 signatures are used (9-16 CHCH), two symbols are repeated, so if the repeated symbols are added, only IFHT of length 8 needs to be performed. In addition, when 3-4 signatures are used (5-8 CPCH), 4 symbols are repeated, and thus IFHT may be performed after adding repeated symbols. In this way, the complexity of the receiver can be greatly reduced by efficiently allocating the existing signatures.

The subscriber station receiver of FIG. 17 has a structure of multiplying a specific mask M after rearranging despread symbols. However, even if the specific mask M is multiplied first and then the despread symbols are rearranged, the result is the same. In this case, the difference is that the shape of the mask M to be multiplied is different.

Referring to the operation of the receiver having the structure as shown in FIG. 17, the multiplier 1711 multiplies the input of the A / D converter by multiplying the spreading code Wp of the pilot channel and inputs it to the channel estimator 1713 to input the channel size of the forward link. Estimate and phase. The multiplier 1917 multiplies the input signal by the Walsh spreading code of the AICH channel, and the accumulator 1725 accumulates it for a predetermined symbol period (256 chips) to output a despread symbol. The despread AICH symbol is demodulated by multiplying the complex conjugate of the complex conjugate 1715 by the complex conjugate of the output of the channel estimator 1713. The demodulated symbol is input to the position converter 1723, which serves to rearrange the input symbols so that the repeated symbols are neighbors. The output of the position converter 1723 is multiplied by the mask output from the mask generator 1425 by the multiplier 1725 and input to the FHT converter 1729. The FHT converter 1729 receives the output of the multiplier and outputs a signal size for each signature. The control and judgment unit 1731 receives the output of the FHT converter 1729 and finds and determines the signature of the CA-ICH most likely to be found. In Fig. 17, even if the positions of the position converter 1723, the mask generator 1725, and the multiplier 1727 are changed, the operation is the same. And even if the mobile station receiver does not change the positions of the input symbols using the position converter 1723, the position where each symbol is transmitted may be stored and used when performing the FHT.

In the present invention, another embodiment of the CA-ICH signature structure is shown. This is summarized as follows. Generate 2K signatures 2K in length. (If you consider multiplying the sign by + 1 / -1, the number of possible signals can be 2K + 1.) However, if you use only some of the signatures instead of using the entire signature, the complexity of the mobile receiver is It is necessary to allocate them more efficiently to reduce the It is assumed that only M signatures are used. Where 2L-1 <M <= 2L and 1 <= L <= K. In this case, M signatures having a length of 2K are remuted to transmit each symbol of the Hadamard function having a length of 2L as many as 2K-L times when a specific mask is XORed after repositioning each symbol position. To form. Therefore, the purpose of the FHT is to be able to simply perform the FHT by multiplying the reception symbols in the subscriber unit receiver by a specific mask and repositioning each symbol.

In addition to the selection of the appropriate signature used for the channel allocation of the CPCH, the assignment of the data channel and control channel of the reverse CPCH and the assignment of the forward control channel for controlling the reverse CPCH are important issues.

First, the easiest method of allocating reverse common control channel is UTRAN assigning one-to-one correspondence between forward control channel for transmitting power control information and reverse common control channel for transmitting subscriber message. As described above, when the forward control channel and the reverse common control channel are allocated in a one-to-one manner, the reverse common control channel and the forward control channel can be allocated with one command without additional messages. That is, the channel allocation method as described above is a case where the CA-ICH designates both channels to be used for the forward and reverse links.

The second method is to map the reverse channel as a function of the signature of the AP transmitted by the subscriber station, the slot number of the access channel, and the signature of the CD_P. For example, the reverse common channel is associated with the reverse channel corresponding to the signature of CD_P and the slot number at the time when the preamble is transmitted. That is, in the channel allocation method as described above, the CD-ICH functions to allocate a channel used for a reverse link, and the CA-ICH allocates a channel used for a forward link. When the UTRAN allocates a forward channel in the above manner, the UTRAN can utilize the resources of the UTRAN to the maximum, thereby increasing the efficiency of channel utilization.

As another example of the assignment of the reverse CPCH, since the UTRAN and the subscriber device simultaneously know the signature of the AP transmitted by the subscriber device and the CA-ICH received by the subscriber device, the reverse CPCH channel is allocated using these two variables. Way. The signature of the AP corresponds to the data rate, and the freedom of channel selection can be increased by assigning the CA-ICH to the reverse CPCH channel in the set of the rate. In this case, when the total number of signatures of the AP is M and the number of CA-AICHs is N, the number of cases that can be selected is M × N.

Here, as shown in Table 7 below, it is assumed that the number of signatures of the AP is 3 (M = 3) and the number of CA-ICH is 4 (N = 4).

Channel number CA number received from CA-AICH CA (1) CA (2) CA (3) CA (4) AP number AP (1) One 2 3 4 AP (2) 5 6 7 8 AP (3) 9 10 11 12

In Table 7, the signatures of the APs are AP 1, AP 2, and AP 3, and the number of channels allocated by the CA-ICH is represented by CA (1), CA (2), and CA. (3), CA (4) can be. In this case, when the channel is allocated, if the channel is selected only by the CA-ICH, the number of assignable channels becomes four. That is, when the UTRAN transmits the CA 3 to the subscriber device and the subscriber device receives the CA 3 accordingly, the subscriber device allocates channel 3. However, as described above, since the subscriber station and the UTRAN know the number of the AP and the number of the CA, it is possible to use them in combination. For example, in the case of allocating a channel using an AP number and a CA number as shown in Table 7, the subscriber device sends an AP 2 and the subscriber device receives a CA 3 from the UTRAN. The device selects the channel 7 (2, 3) channel rather than the channel 3 as in the above case. That is, the channels corresponding to AP = 2 and CA = 3 can be found in Table 7, and both the subscriber device and the UTRAN have the information shown in Table 7 above. Accordingly, when the subscriber station and the UTRAN select the second row and the third column in the <Table 7>, it can be seen that the number of the allocated channel is seven. Therefore, the channel number corresponding to (2, 3) is number 7.

Therefore, the method of selecting using two variables as described above increases the number of selectable channels. The information as shown in Table 7 may be calculated by the subscriber station and the UTRAN by higher layer signal exchange, or by an equation. That is, the number and the point of intersection with each other can be found with the vertical AP number and the horizontal CA number. Currently, there are 16 types of APs and 16 numbers allocated by CA-ICH, so the maximum number of channels that can be created is 16x16 = 256.

As described above, the meaning of 16 kinds of AP signatures and information determined using a CA-ICH message means a scrambling code to be used when transmitting a PC-P and a message of a reverse CPCH, and a channel code used in the reverse CPCH. That is, it means a channel code of a channel code for use in the reverse DPDCH and the reverse DPCCH included in the reverse CPCH and a forward dedicated channel (DL-DCH, that is, a channel code for the DL-DPCCH) for power control of the reverse CPCH. Since the UTRAN allocates a channel to the subscriber device because the AP signature requested by the subscriber device is the maximum data rate that the subscriber device wants to use, the UTRAN currently allocates the maximum data rate requested by the subscriber device. Select a channel that is not in use and transmit the selected signature according to the following rules for specifying the signature corresponding to the channel.

As described above, the reverse scrambling code assigned to the subscriber device by the UTRAN using the 16 kinds of signatures of the AP and the CA-ICH message, the channel code used in the scrambling code, and the forward dedicated channel for power control of the reverse CPCH. An embodiment of the assignment is shown in FIG.

An advantage of using the above method is that when the UTRAN allocates a fixed number of modems for each data rate of the PCPCH, the following problems may occur. For example, suppose the UTRAN has assigned 5 modems for 60kbps, 10 modems for 30kbps, and 20 modems for 15kbps. In the above environment, if the subscriber devices in the UTRAN use 20 PCPCHs for 15kbps, use 7 PCPCHs for 30kbps, and use all 3 for 60kbps. If the device requires PCPCH for 15kbps, the UTRAN cannot allocate PCPCH to a subscriber device that requires PCPCH for 15kbps even though the PCPCH is free.

Therefore, in the embodiment of the present invention, PCPCH can be allocated to a subscriber device even when the above occurs, and any PCPCH can support two or more transmission rates so that a PCPCH having a high transmission rate can be allocated to a PCPCH having a low transmission rate. Show how to do this.

Prior to the description of the first method for the UTRAN to transmit information necessary for the use of CPCH to the subscriber device using the signature of the AP and the CA-ICH message, the following three assumptions are assumed.

First, P _SF = the number of Physical Common Packet Channels (hereinafter, referred to as "PCPCH") of a specific Spreading Factor, and the number of the channel code of a specific Spreading Rate is indicated using the P _SF . Examples of the display method may be Nod _SF (0), Nod _SF (1), Nod _SF (2), ..., Nod _SF (P _SF -1). The even number of the Nod _SFs is used to spread the data portion of the CPCH, and the odd number is used to spread the control portion of the CPCH. The P _SF is equal to the number of modems used for demodulation of the reverse CPCH in the UTRAN, and may be equal to the number of forward dedicated channels allocated corresponding to the reverse CPCH in the UTRAN.

Second, T _SF = the number of CA signatures used for a specific diffusion rate, and the number of CA signatures used for a specific diffusion rate can be indicated using the T _SF . Examples of the above display method may be CA _SF (0), CA _SF (1), ..., and CA _SF (T _SF -1).

Third, S _SF = number of AP signatures used for a specific spreading rate, and the number of AP signatures used for a specific spreading rate may be indicated using the S _SF . Examples of the display method may be AP _SF (0), AP _SF (1), ..., AP _SF (S _SF -1).

The three matters defined above are determined by the UTRAN, and the product of T _SF and S _SF should have a value equal to or greater than P _SF , and the S _SF is determined by how the subscriber station using the CPCH transmits the AP to the UTRAN. It is possible to set whether to allow as many collisions and the utilization of CPCH of each spreading rate (which is inversely proportional to the data rate). When the S _SF is set, the T _SF is determined in consideration of the P _SF .

Referring to FIG. 30, a first method of delivering information required for CPCH to a subscriber device using a signature of an AP and a CA message will be described. 30A of FIG. 30A is a process of determining the number of P _SFs according to the number of PCPCHs in the UTRAN, and 3002 is a process of determining S _SF and T _SF .

3003 of FIG. 30A illustrates a process of calculating M _SF . The M _SF is a positive integer C value of the minimum value divided by S _SF becomes zero multiplied by any positive integer C to the S _SF, the M _SF is taken to when the CA message, refer to the same common packet physical channel The reason for calculating the M _SF is to allocate a CA message so that the CA message does not point to the same common packet physical channel in a repetitive period. The equation for calculating the M _SF of 3003 is as follows.

30A of FIG. 30A is a process of calculating n, where n is a value indicating how many times the cycle of M _SF is repeated. For example, when n = 0, the cycle of the CA message has never been rotated, and n = 1. Means that the CA message cycles once. The value of n is obtained in the process of finding n that satisfies the following condition, and n starts from zero.

In the condition of finding the value of n, i is the number of the AP signature and j is the number of the CA message.

30A 3005 is The process of calculating the function value, The function is permutation, and the purpose of calculating the sigma function is that if the CA message indicates only a certain physical common channel periodically, the CA message has periodicity and thus does not teach a specific physical common channel. In order not to indicate only a certain physical common channel, the function of the CA message is arbitrarily controlled.

remind Is defined as follows.

remind In the definition of the function of the AP signature number i is, it takes a modular operation to the S _SF is to not exceed the value of the S _SF, is intended to refer to the PCPCH in the CA message sequence.

3006 of FIG. 30A is obtained from 3005. The process of calculating the value of k by inputting the AP signature number i and the CA message number j using the function value and the n value obtained in 3004. The k value is a PCPCH number of a specific spreading rate or a specific transmission rate. The k value is a one-to-one correspondence with a modem number allocated for demodulation of a reverse PCPCH of a specific spreading rate or a specific transmission rate by the UTRAN. A value that can correspond one-to-one with the scrambling code of the reverse PCPCH.

When the result of calculating the k value is calculated, the channel number of the forward dedicated channel corresponding to the k value one-to-one is obtained. In other words, the channel code of the forward dedicated channel is determined by a combination of the number of the AP signature transmitted by the subscriber station and the CA message allocated by the UTRAN, thereby controlling the reverse CPCH corresponding to the forward dedicated channel.

30A is connected to FIG. 30B.

3007 of FIG. 30B is a channel whose data portion channel code of a reverse common channel corresponding one-to-one corresponds to the forward dedicated channel designated by k using the k value used in 3006 of FIG. 30A. It is the process of finding the range of sign recognition. The calculation of the range of the reverse channel code is calculated using the following conditions.

remind This means diffusion rate In channel code (OVSF code) This means diffusion rate Since it is an in-channel code (OVSF code), it can be seen from k that the channel code used for the message part of the reverse PCPCH exists in a branch having a spread rate in the OVSF code tree.

3008 of FIG. 30B is a process of determining the number of the scrambling code to be used for the reverse PCPCH using k obtained in 3006 of FIG. 30A and m obtained in 3007. The number of the scrambling code corresponds one-to-one with the reverse scrambling code used for the PCPCH, and the subscriber device uses the scrambling code indicated by the scrambling code to spread the PC_P and the PCPCH to the UTRAN.

The equation for obtaining the number of the reverse scrambling code is as follows.

In the above formula, k is a value obtained in 3006 and m is a value obtained in 3007.

In step 3009 of FIG. 30B, the subscriber device determines a heading node of a channel code used to channelize the message part of the reverse PCPCH. The heading node refers to a node having the lowest spreading rate (the highest transmission rate) among branches of the OVSF code tree corresponding to k. The subscriber device that determines the heading node determines a channel code to be used by the subscriber device using the spreading rate determined by the subscriber device while receiving the AP. For example, if k = 4, the heading node corresponding to k is spreading rate = 16, and the subscriber station desires PCPCH with spreading rate = 64, the subscriber station selects and uses a channel code of 64 spreading rate from the heading node. There may be two ways to select. In the first method, a channel code branch extending upward from the heading node, that is, a channel code having a spread rate of 256, is used as a control unit of a reverse PCPCH, and a channel having a spreading rate requested by a subscriber station among channel code branches downward from the heading node is used. When a code branch is encountered, the channel code extending from the branch is used for the message part. The second method uses a channel code with a spreading rate of 256 generated by continuously extending from the lower branch of the heading node to the channel spread of the PCPCH controller, and continuously extends upward from the upper branch of the heading node. When a branch of a channel code having a spreading rate is encountered, the upper branch of the two branches is used for channel spreading of the message portion.

In step 3010 of FIG. 30B, a process of determining a channel code used by a subscriber device to channel spread a message part of a PCPCH using a spreading rate known by the heading node and the subscriber device obtained in 3009 is performed. As a second method, a method of determining a channel code to be used by a subscriber station is used.

The equation used to determine the channel code is as follows.

If the UTRAN allocates information and channels necessary for PCPCH to the subscriber device using the AP and CA messages as described in FIG. 30, the PCPCH resource utilization of the prior art can be increased.

(Example)

An embodiment according to the algorithm of the first method for the UTRAN to transmit information required for the use of the CPCH to the subscriber device using the signature of the AP and the CA-ICH message is as follows.

P _4.2 = 1 AP ₁ (= AP _4,2 (0)), AP ₂ (= AP _4,2 (1))

P ₄ = 1 AP ₃ (= AP ₄ (0)), AP ₄ (= AP ₄ (1))

P ₈ = 2 AP ₅ (= AP ₈ (0)), AP ₆ (= AP ₈ (1))

P ₁₆ = 4 AP ₇ (= AP ₁₆ (0)), AP ₈ (= AP ₁₆ (1))

P ₃₂ = 8 AP ₉ (= AP ₃₂ (0)), AP ₁₀ (= AP ₃₂ (1))

P ₆₄ = 16 AP ₁₁ (= AP ₆₄ (0)), AP ₁₂ (= AP ₆₄ (1))

P ₁₂₈ = 32 AP ₁₃ (= AP ₁₂₈ (0)), AP ₁₄ (= AP ₁₂₈ (1))

P ₂₅₆ = 32 AP ₁₅ (= AP ₂₅₆ (0)), AP ₁₆ (= AP ₂₅₆ (1))

It is assumed that a CA can use all 16 CAs.

At this time, using the given AP signature value and the CA signature value received from the base station, the corresponding Node value is found as follows.

(1) Multi-code: P4.2 = 1

F (AP1, CA0) = Nod4,2 (0)

F (AP2, CA0) = Nod4,2 (0)

(2) When SF = 4: P ₄ = 1

F (AP3, CA0) = Nod4 (0)

F (AP4, CA0) = Nod4 (0)

(3) When SF = 8: P ₈ = 2

F (AP5, CA0) = Nod8 (0), F (AP6, CA1) = Nod8 (0)

F (AP6, CA0) = Nod8 (1), F (AP5, CA1) = Nod8 (1)

(4) When SF = 16: P16 = 4

F (AP7, CA0) = Nod16 (0), F (AP8, CA2) = Nod16 (0)

F (AP8, CA0) = Nod16 (1), F (AP7, CA2) = Nod16 (1)

F (AP7, CA1) = Nod16 (2), F (AP8, CA3) = Nod16 (2)

F (AP8, CA1) = Nod16 (3), F (AP7, CA3) = Nod16 (3)

(5) When SF = 32: P32 = 8

F (AP9, CA0) = Nod32 (0), F (AP10, CA4) = Nod32 (0)

F (AP10, CA0) = Nod32 (1), F (AP9, CA4) = Nod32 (1)

F (AP9, CA1) = Nod32 (2), F (AP10, CA5) = Nod32 (2)

F (AP10, CA1) = Nod32 (3), F (AP9, CA5) = Nod32 (3)

F (AP9, CA2) = Nod32 (4), F (AP10, CA6) = Nod32 (4)

F (AP10, CA2) = Nod32 (5), F (AP9, CA6) = Nod32 (5)

F (AP9, CA3) = Nod32 (6), F (AP10, CA7) = Nod32 (6)

F (AP10, CA3) = Nod32 (7), F (AP9, CA7) = Nod32 (6)

(6) When SF = 64: P ₆₄ = 16

F (AP ₁₁ , CA ₀ ) = Nod ₆₄ (0), F (AP ₁₂ , CA ₈ ) = Nod ₆₄ (0)

F (AP ₁₂ , CA ₀ ) = Nod ₆₄ (1), F (AP ₁₁ , CA ₈ ) = Nod ₆₄ (1)

F (AP ₁₁ , CA ₁ ) = Nod ₆₄ (2), F (AP ₁₂ , CA ₉ ) = Nod ₆₄ (2)

F (AP ₁₂ , CA ₁ ) = Nod ₆₄ (3), F (AP ₁₁ , CA ₉ ) = Nod ₆₄ (3)

F (AP ₁₁ , CA ₂ ) = Nod ₆₄ (4), F (AP ₁₂ , CA ₁₀ ) = Nod ₆₄ (4)

F (AP ₁₂ , CA ₂ ) = Nod ₆₄ (5), F (AP ₁₁ , CA ₁₀ ) = Nod ₆₄ (5)

F (AP ₁₁ , CA ₃ ) = Nod ₆₄ (6), F (AP ₁₂ , CA ₁₁ ) = Nod ₆₄ (6)

F (AP ₁₂ , CA ₃ ) = Nod ₆₄ (7), F (AP ₁₁ , CA ₁₁ ) = Nod ₆₄ (7)

F (AP ₁₁ , CA ₄ ) = Nod ₆₄ (8), F (AP ₁₂ , CA ₁₂ ) = Nod ₆₄ (8)

F (AP ₁₂ , CA ₄ ) = Nod ₆₄ (9), F (AP ₁₁ , CA ₁₂ ) = Nod ₆₄ (9)

F (AP ₁₁ , CA ₅ ) = Nod ₆₄ (10), F (AP ₁₂ , CA ₁₃ ) = Nod ₆₄ (10)

F (AP ₁₂ , CA ₅ ) = Nod ₆₄ (11), F (AP ₁₁ , CA ₁₃ ) = Nod ₆₄ (11)

F (AP ₁₁ , CA ₆ ) = Nod ₆₄ (12), F (AP ₁₂ , CA ₁₄ ) = Nod ₆₄ (12)

F (AP ₁₂ , CA ₆ ) = Nod ₆₄ (13), F (AP ₁₁ , CA ₁₄ ) = Nod ₆₄ (13)

F (AP ₁₁ , CA ₇ ) = Nod ₆₄ (14), F (AP ₁₂ , CA ₁₅ ) = Nod ₆₄ (14)

F (AP ₁₂ , CA ₇ ) = Nod ₆₄ (15), F (AP ₁₁ , CA ₁₅ ) = Nod ₆₄ (15)

(7) In case of SF128: P128 = 32

F (AP ₁₃ , CA ₀ ) = Nod ₁₂₈ (0)

F (AP ₁₄ , CA ₀ ) = Nod ₁₂₈ (1)

F (AP ₁₃ , CA ₁ ) = Nod ₁₂₈ (2)

F (AP ₁₄ , CA ₁ ) = Nod ₁₂₈ (3)

F (AP ₁₃ , CA ₂ ) = Nod ₁₂₈ (4)

F (AP ₁₄ , CA ₂ ) = Nod ₁₂₈ (5)

F (AP ₁₃ , CA ₃ ) = Nod ₁₂₈ (6)

F (AP ₁₄ , CA ₃ ) = Nod ₁₂₈ (7)

F (AP ₁₃ , CA ₄ ) = Nod ₁₂₈ (8)

F (AP ₁₄ , CA ₄ ) = Nod ₁₂₈ (9)

F (AP ₁₃ , CA ₅ ) = Nod ₁₂₈ (10)

F (AP ₁₄ , CA ₅ ) = Nod ₁₂₈ (11)

F (AP ₁₃ , CA ₆ ) = Nod ₁₂₈ (12)

F (AP ₁₄ , CA ₆ ) = Nod ₁₂₈ (13)

F (AP ₁₃ , CA ₇ ) = Nod ₁₂₈ (14)

F (AP ₁₄ , CA ₇ ) = Nod ₁₂₈ (15)

F (AP ₁₃ , CA ₈ ) = Nod ₁₂₈ (16)

F (AP ₁₄ , CA ₈ ) = Nod ₁₂₈ (17)

F (AP ₁₃ , CA ₉ ) = Nod ₁₂₈ (18)

F (AP ₁₄ , CA ₉ ) = Nod ₁₂₈ (19)

F (AP ₁₃ , CA ₁₀ ) = Nod ₁₂₈ (20)

F (AP ₁₄ , CA ₁₀ ) = Nod ₁₂₈ (21)

F (AP ₁₃ , CA ₁₁ ) = Nod ₁₂₈ (22)

F (AP ₁₄ , CA ₁₁ ) = Nod ₁₂₈ (23)

F (AP ₁₃ , CA ₁₂ ) = Nod ₁₂₈ (24)

F (AP ₁₄ , CA ₁₂ ) = Nod ₁₂₈ (25)

F (AP ₁₃ , CA ₁₃ ) = Nod ₁₂₈ (26)

F (AP ₁₄ , CA ₁₃ ) = Nod ₁₂₈ (27)

F (AP ₁₃ , CA ₁₄ ) = Nod ₁₂₈ (28)

F (AP ₁₄ , CA ₁₄ ) = Nod ₁₂₈ (29)

F (AP ₁₃ , CA ₁₅ ) = Nod ₁₂₈ (30)

F (AP ₁₄ , CA ₁₅ ) = Nod ₆₄ (31)

(8) When SF = 256: P256 = 32

F (AP ₁₅ , CA ₀ ) = Nod ₂₅₆ (0)

F (AP ₁₆ , CA ₀ ) = Nod ₂₅₆ (1)

F (AP ₁₅ , CA ₁ ) = Nod ₂₅₆ (2)

F (AP ₁₆ , CA ₁ ) = Nod ₂₅₆ (3)

F (AP ₁₅ , CA ₂ ) = Nod ₂₅₆ (4)

F (AP ₁₆ , CA ₂ ) = Nod ₂₅₆ (5)

F (AP ₁₅ , CA ₃ ) = Nod ₂₅₆ (6)

F (AP ₁₆ , CA ₃ ) = Nod ₂₅₆ (7)

F (AP ₁₅ , CA ₄ ) = Nod ₂₅₆ (8)

F (AP ₁₆ , CA ₄ ) = Nod ₂₅₆ (9)

F (AP ₁₅ , CA ₅ ) = Nod ₂₅₆ (10)

F (AP ₁₆ , CA ₅ ) = Nod ₂₅₆ (11)

F (AP ₁₅ , CA ₆ ) = Nod ₂₅₆ (12)

F (AP ₁₆ , CA ₆ ) = Nod ₂₅₆ (13)

F (AP ₁₅ , CA ₇ ) = Nod ₂₅₆ (14)

F (AP ₁₆ , CA ₇ ) = Nod ₂₅₆ (15)

F (AP ₁₅ , CA ₈ ) = Nod ₂₅₆ (16)

F (AP ₁₆ , CA ₈ ) = Nod ₂₅₆ (17)

F (AP ₁₅ , CA ₉ ) = Nod ₂₅₆ (18)

F (AP ₁₆ , CA ₉ ) = Nod ₂₅₆ (19)

F (AP ₁₅ , CA ₁₀ ) = Nod ₂₅₆ (20)

F (AP ₁₆ , CA ₁₀ ) = Nod ₂₅₆ (21)

F (AP ₁₅ , CA ₁₁ ) = Nod ₂₅₆ (22)

F (AP ₁₆ , CA ₁₁ ) = Nod ₂₅₆ (23)

F (AP ₁₅ , CA ₁₂ ) = Nod ₂₅₆ (24)

F (AP ₁₆ , CA ₁₂ ) = Nod ₂₅₆ (25)

F (AP ₁₅ , CA ₁₃ ) = Nod ₂₅₆ (26)

F (AP ₁₆ , CA ₁₃ ) = Nod ₂₅₆ (27)

F (AP ₁₅ , CA ₁₄ ) = Nod ₂₅₆ (28)

F (AP ₁₆ , CA ₁₄ ) = Nod ₂₅₆ (29)

F (AP ₁₅ , CA ₁₅ ) = Nod ₂₅₆ (30)

F (AP ₁₆ , CA ₁₅ ) = Nod ₂₅₆ (31)

The above can be expressed using <Table 8> as below. The above contents can be expressed using the following <Table 8>. Table 8 below shows the channel mapping relationship for the above embodiment. The required scrambling code number and channelization code number can be obtained as shown in Table 8 below. When using a unique scrambling code, that is, when only one UE can use one scrambling code, the scrambling code number matches the PCPCH number and the channelization codes are all zero.

<Table 8> shows an example in the case where several UEs can use one scrambling code at the same time, but in the case of using a single scrambling code in which one scrambling code is available to one UE. In scrambling code number is same as PCPCH number and all channel code numbers are 0 or 1 in SF = 4 node.

30A to 3006 of FIG. 30A is a process of calculating the number k of the PCPCH having a specific spreading rate or a specific transmission rate. In addition to the method used in 30001 to 3006 of FIG. 30A, there is another method of determining the K value using the signature number I and the CA signature number j of the AP.

The equation used in the second method of determining the k value using the AP and CA messages is as follows.

In the above equation, AP _SF (i) is the I-th signature among the AP signatures according to the specific diffusion rate, and CA _SF (j) means the j-th message among the CA signatures according to the specific diffusion rate. The meaning of the F function is a function of indicating the number k of the reverse PCPCH to the subscriber station by the number of the AP signature and the CA signature at the AP specific spreading rate. In the above formula, M _SF has a different meaning than M _SF in Fig. 30. The M _SF in FIG. 30 is a period until the CA messages point to the same common packet physical channel, but the M _SF in the above equation is a small value among the total number of PCPCHs at a specific spreading rate and the total number of CA messages used at a specific spreading rate. Point. The above equation may be used when the CA signature number is smaller than the M _SF at a specific diffusion rate. That is, if the total number of CA signatures used at a specific spreading rate is smaller than the number of PCPCHs, the number of CA signatures that UTRAN sends to subscriber equipment should be specified as smaller than the total number of CA signatures. If the total number is less than the number of CA signatures, then the number of CA signatures that the UTRAN sends to the subscriber device should use only a value smaller than the total number of PCPCHs. The reason why the range of the equation is defined as described above is that the equation of the second method is to allocate PCPCH by the number of CA signatures while fixing the AP signature number. The reason for the use as described above is that when the UTRAN allocates PCPCH to subscriber equipment using multiple CA signatures, the number of PCPCHs is greater than the number of CA messages at a specific spreading rate. When the above cases occur, the number of CA signatures is insufficient, so that the PCPCH is allocated using the AP signature transmitted by the subscriber device. In the above equation, the value of the number k of the reverse PCPCH is obtained by multiplying the M _SF by the number i of the AP signature and adding the value of the CA signature number j to the total number of PCPCHs. When the number of CA signatures is smaller than the number of PCPCHs by the modular operation, the UTRAN can allocate PCPCHs to the AP. When the number of CA signatures is larger than the number of PCPCHs, the CA signatures required by the modular operation are increased. It becomes usable.

The biggest difference between the first method and the second method of allocating the reverse PCPCH using the number i of the AP signature and the number j of the CA signature is as follows. The first method uses the AP's signature number to assign PCPCH with the CA signature number fixed, and the second method uses the CA signature number with the PC signature with the AP's signature fixed. Is to assign a.

K obtained by the equation used in the second method is used to calculate the spread rate of the channel code used in the data portion of 3007 reverse PCPCH of FIG. 30B, and the calculation result and k value of 3007 of FIG. Determine the number of reverse scrambling code to use. The heading node number is determined in FIG. 3009 of FIG. 30B, and the channel code number used for the reverse PCPCH is determined in 3010 of FIG. 30B. The process of 3007 to 3010 of FIG. 30B is the same as the first method of allocating the reverse PCPCH using the number of the AP signature and the number of the CA signature.

In the third method of allocating the reverse PCPCH using the number i of the AP signature and the number j of the CA signature, the following equation is used.

The third method uses a different formula for determining the number k of reverse PCPCH by comparing the total number of PCPCHs with a specific data rate or a specific spreading rate and the total number of CA signatures. The first equation of the third method is used when the number of PCPCH is less than or equal to the number of CA signatures. In the above equation, the number j of the CA signature is the number k of the reverse PCPCH.

The second formula of the formula of the third method is a formula used when the number of reverse PCPCH is greater than the number of CA signatures. In the above formula, the σ function is the same function as the σ function calculated in step 3005 of FIG. 30A, and the meaning of the sigma function is to allow the CA messages to indicate PCPCH in order. In the above formula, multiplying the total number of AP signatures by subtracting 1 from the CA signature number and performing a modular operation with the total number of reverse PCPCHs indicates that the value of the number k of reverse PCPCHs calculated is greater than the total number of reverse PCPCHs set at a specific spreading rate. This is to avoid.

The k value calculated in the above equation is used from step 3007 to step 3010 of FIG. 30b to be used in the method in which the UTRAN allocates the reverse PCPCH to the subscriber device.

Referring to FIG. 18 and FIG. 19, the controller 1820 of the subscriber station and the controller 1920 of the base station may include allocation information of CPCH as shown in Table 7 above. By using the method, a common packet channel having a structure as shown in Table 7 may be allocated. In the description of FIGS. 18 and 19, it is assumed that the controllers 1820 and 1920 have the table information as shown in Table 7.

First, when communication through CPCH is necessary, the controller 1820 of the subscriber device determines the AP signature corresponding to the data rate if the subscriber device checks the CSICH and if the subscriber device can use the desired data rate, and then uses the determined signature and the scrambling code. The signal is transmitted through the preamble generator 1831 to be multiplied by the chip unit. The UTRAN then receives the AP, identifies the signature used by the AP, and transmits the AP-AICH using the received signature if the signature is not used by another subscriber station, and if it is in use by another subscriber station, the phase of the received signature. The AP-AICH is transmitted using the inverted signature value. At this time, the UTRAN checks the use of the signature of the response signal for the AP requested by another subscriber device using a different signature, and generates the signature value of phase inversion or in phase of the received signature, and then adds the values of each signature to the AP-AICH. By generating a signal, we can send the status for each signature. When the subscriber device receives the AP-AICH using the signature that is identical to the signature, the subscriber device transmits the CD_P using any one of the signatures for collision detection in response thereto. When the UTRAN receives the signature included in the CD_P, the UTRAN transmits the CD-ICH using the same signature. At the same time, when the UTRAN receives the CD_P through the preamble detector 1911, the controller 1920 of the UTRAN detects that the common packet channel is an allocation request, and according to the signature requested by the subscriber device, the data rate required by the subscriber device known to the UTRAN Among the scrambling codes corresponding to the scrambling code that is not used, that is, the CA-ICH signature designated by Table 7 is determined. Accordingly, the CA-ICH signature becomes information for allocating the CPCH in combination with the AP. The controller 1920 of the UTRAN assigns a CPCH by combining the determined CA-ICH signature and the received AP signature. The UTRAN inputs the determined CA-ICH signature information to the AICH generator 1931 to generate a CA-ICH. The CA-ICH is then transmitted to the subscriber device through the signal generator 1933. The subscriber station receiving the CA-AICH signature information allocates a common packet channel in the same manner as described above using the transmitted CA-AICH signature and the signature information of the transmitted access preamble.

18 is a diagram illustrating a structure of a subscriber device for communicating a message through a reverse CPCH according to an embodiment of the present invention.

Referring to FIG. 18, the AICH demodulator 1811 receives and demodulates the AICH signals of the forward link transmitted from the AICH generator of UTRAN under the control of the channel designation control message 1822 transmitted from the controller 1820 to the AICH demodulator 1811. The AICH demodulator 1811 may include an AP-AICH demodulator, a CD-ICH demodulator, and a CA-ICH demodulator, respectively. In this case, the controller 1820 designates a channel of each demodulator so as to receive AP-AICH, CD-AICH and CA-AICH transmitted from UTRAN as shown in 311 of FIG. 3. In addition, the AP-AICH, CD-ICH and CA-ICH may be implemented in one demodulator or in separate demodulators. In this case, the controller 1820 may designate a channel by allocating slots to receive each AICH received in time division.

The data and control signal processor 1813 is assigned a channel by the controller 1820 and receives and processes data or control signals (including power control commands) received through the designated channel. A channel estimator 1815 estimates the strength of the signal transmitted from the UTRAN and received on the forward link, controls phase compensation and gain of the data and control signal processor 1813, and assists in demodulation.

The controller 1820 controls the overall operation of the forward link channel receiver and reverse link channel transmitters of the subscriber device. In an embodiment of the present invention, the controller 1820 controls the generation of the access preamble AP and the collision detection preamble CD when the UTRAN is accessed using the preamble generation control signal 1826, and uses the power control signal 1824 of the reverse link to perform the reverse link. Control power and process AICH signals transmitted from the UTRAN. That is, the controller 1820 generates the access preamble AP and the collision detection preamble CD_P by controlling the preamble generator 1831 as shown in 331 of FIG. 3, and processes the AICH signals generated as shown by 301 of FIG. 3 by controlling the AICH demodulator 1811.

The preamble generator 1831 generates and outputs a preamble AP and a CD as shown in 331 of FIG. 3 under the control of the controller 1820. A frame formatter 1835 inputs preamble APs and CDs output from the preamble generator 1831, packet data and pilot signals of a reverse link, and formats the frame data into frame data, and outputs the data to the power control signal output from the controller 1820. By controlling the transmit power of the reverse link, and after receiving the CPCH from the UTRAN, it is possible to receive the power control preamble and other uplink transmission signals 1832 such as data to be transmitted to the UTRAN. In this case, a power control command for controlling the power of the forward link may be transmitted to the reverse link.

19 illustrates a structure of a transceiver of a UTRAN for communicating a message through a reverse common channel according to an embodiment of the present invention.

Referring to FIG. 19, the preamble detector 1911 detects the AP and the CD_P transmitted from the subscriber device and receives the received AP and CD_P as shown in 331 of FIG. The data and control signal processor 1913 is assigned a channel by the controller 1920 and receives and processes data or control signals received through the designated channel. A channel estimator 1915 estimates the strength of the signal transmitted from the subscriber device and received on the forward link to control the gain of the data and control signal processor 1913.

The controller 1920 of FIG. 19 controls overall operations of the forward link channel transmitter and the reverse link channel transmitter of the UTRAN. The controller 1920 controls the detection of the access preamble AP and the collision detection preamble CD_P generated when the mobile station accesses the UTRAN using the preamble selection control command 1922, and responds to the AP and the CD_P and an AICH signal for a channel allocation command. Control the occurrence of these. That is, the controller 1920 controls the AICH generator 1931 using the AICH generation control command 1926 when the access preamble AP and the collision detection preamble CD received through the preamble detector 1911 are detected as shown in 351 of FIG. 3. AICH signals are generated as follows.

The AICH generator 1931 generates the AP-AICH, CD-ICH, and CA-ICH which are response signals to the preamble signal under the control of the controller 1920. The AICH generator 1931 may include an AP-AICH generator, a CD-ICH generator, and a CA-ICH generator, respectively. In this case, the controller 1920 designates each generator so as to generate AP-AICH, CD-ICH and CA-ICH as shown in 301 of FIG. 3. In addition, the AP-ICH, CD-ICH and CA-ICH may be implemented as one generator or may be implemented as separate generators. In this case, the controller 1920 may time slot the slots of the AICH frame and allocate slots of the AICH frame to transmit the AP-AICH, CD-ICH, and CA-ICH.

A frame formatter 1933 inputs and formats the AP-AICH, CD-AICH and CA-AICH output from the AICH generator 1931 and control signals of a forward link, and outputs the power control command output from the controller 1920. The transmission power of the reverse link is controlled by 1924. In addition, if a power control command for the forward link is transmitted to the reverse link, the power of the forward channel for controlling the common packet channel may be controlled according to the power control command.

An embodiment of the present invention describes a method in which an UTRAN performs outer loop power control using a forward dedicated channel corresponding to one-to-one when a reverse CPCH is set, and a method of transmitting a CA confirmation message to a subscriber device.

The forward dedicated physical channel includes a forward dedicated control physical channel and a forward dedicated data physical channel, and the forward dedicated control physical channel includes pilot bits of 4 bits, reverse power control instructions of 2 bits, and bit rate information (TFCI) of 0 bits. The forward dedicated data physical channel includes 4 bits of data bits, and the forward dedicated physical channel corresponding to the reverse CPCH is spread with a channel code having a spreading rate of 512 and transmitted to the subscriber device.

In the method of performing the outer loop power control using the forward dedicated physical channel, the UTRAN uses a transmission rate information (TFCI) field or a pilot bit field among the forward dedicated data physical channel and the forward dedicated control physical channel, and is previously promised to the subscriber device. By sending a bit pattern, the subscriber equipment measures the bit rate of the forward data channel and the bit rate of the forward control physical channel, and transmits the bit pattern to the UTRAN so that the UTRAN can be used for outer loop power control.

The bit pattern previously promised to the UTRAN and the subscriber device may be a specific bit pattern or a coded bit string corresponding one-to-one with a channel assignment confirmation message or channel assignment confirmation message used in the embodiment of the present invention. .

The channel allocation confirmation message means a confirmation message for the CPCH requested by the subscriber station and allocated by the UTRAN.

A method of transmitting a specific bit pattern or a coded bit string corresponding to a channel allocation confirmation message or a channel allocation confirmation message transmitted from the UTRAN to a subscriber device in a one-to-one manner may include a data field of a forward dedicated data physical channel corresponding to the reverse CPCH. It may be transmitted using a rate information (TFCI) field of the forward dedicated control physical channel.

The method of using the data field of the forward dedicated data physical channel includes a method of simply and repeatedly transmitting a channel assignment confirmation message to 4 bits of data field without encoding 4 bits or 3 bits and a method of encoding and transmitting the channel assignment confirmation message. Can be used. When 3 bits are used in the channel assignment confirmation message, when the reverse CPCH is allocated to the subscriber station, the CPCH is allocated using two signatures. When using the above method, the structure of the forward dedicated physical channel includes 4 bits of data field, 4 bits of pilot field, and 2 bits of power control command field.

In the method of transmitting by using the TFCI field of the forward dedicated control physical channel, 2 bits out of 4 bits allocated to the data field in the structure of the forward dedicated physical channel of the first method are allocated to the TFCI field and 2 bits. A method of transmitting an encoded symbol may be used. The 2 bits of the TFCI field are bits transmitted in one slot, and 30 bits are transmitted during one frame composed of 15 slots. As a method for encoding a bit transmitted in the TFCI bit, a (30, 4) encoding method or a (30, 3) encoding method is used. The (30, 4) coding method or the (30, 3) coding method may use zero fading in the (30, 6) coding method used for transmission of TFCI in the conventional WCDMA standard.

When using the second method, the slot structure of the forward dedicated physical channel includes 2 bits of data field, 2 bits of TFCI field, 2 bits of TPC, and 4 bits of pilot bit.

Using the two methods described above, it is possible to measure the bit error rate for the outer loop power control using the forward dedicated physical channel, and at the same time correspond one-to-one with the channel allocation message or the channel allocation message known to the subscriber station and the UTRAN. The channel allocation of the CPCH can be confirmed by transmitting the bit or bit string that is used, thereby achieving stability in channel allocation of the CPCH.

While transmitting one frame of the forward dedicated channel, N slots can transmit a pattern previously promised by the UTRAN and the subscriber station to measure the bit error rate, and 15-N slots can be used to transmit a channel assignment confirmation message. Can also be. In addition, in the transmission of the forward dedicated channel, a specific frame may be used to transmit a pattern previously promised by the UTRAN and a subscriber device for measuring a bit error rate, and another specific frame may be used to transmit a channel assignment confirmation message. As an example of the method, a channel assignment confirmation message may be transmitted when the first or second frame of the forward dedicated physical channel is transmitted, and the subsequent frames measure the bit error rate of the forward dedicated channel. This can be used when the subscriber station and the UTRAN transmit a previously promised bit pattern.

The flow of signals and data between the subscriber station and the UTRAN of the embodiment of the present invention, which is presented for reverse outer loop control of the outer loop power control described above, is shown in FIG. The forward outer loop power control of the outer loop power control may use the same method as the method used for the forward outer power control of the dedicated channel in the W-CDMA standard.

Prior to the description with reference to FIG. 33, terms shown in FIG. 33 are defined as follows. The terms defined below are terms used in the W-CDMA standardization method and are defined in the standard.

The 3301 UE of FIG. 33 is a subscriber device.

In FIG. 33, 3311 node B, DRNC, and SRNC are included in UTRAN, node B is a concept of a base station in an asynchronous mobile communication method, and a DRNC (Drift Radio Network Controller) and a SRNC (Serving Radio Network Controller) are RNC ( Radio Network Controller), the RNC is a name in UTRAN that serves to manage Node B. The RNC plays a role similar to that of a base station controller of a synchronous mobile communication method. The distinction between the SRNC and the DRNC is distinguished in terms of subscriber equipment. When the subscriber device is connected to a specific node B and connected to a core network of an asynchronous mobile communication network through an RNC managing the node B, the RNC becomes an SRNC, and the subscriber device is connected to a specific node B, but the node B If the RNC is connected to the core network of an asynchronous mobile communication network through an RNC not in charge of the RNC, the RNC becomes a DRNC.

33, 3351 Uu of FIG. 33 is an interface between the subscriber station and Node B, 3353 Iub is an interface between Node B and RNC, and 3357 Iur is an interface between RNC and RNC.

Signal and control flow between UE and UTRAN for external loop power control in CPCH is as follows. 3302 and 3304 are data of users 1 and n transmitted through 3303 reverse PCPCH and 3305 reverse PCPCH, and a unit is a transmit time interval (TTI). It is assumed that the user 1 and the n are connected to the same node B, RNC for convenience of description of the embodiment of the present invention. The TTI is a time unit for transmitting data in an upper layer above the physical layer and uses 10 ms, 20 ms, 40 ms, and 80 ms in the W-CDMA standard. User data 3302 and 3304 transmitted through node 3311 via PCPCH is received at node B. The 3311 node B performs a cyclic redundancy check (CRC) for each transport block unit, and indicates whether an error is indicated by a CRC indicator. The CRC and the CRCI resulting from the CRC are transmitted together with QE (Quality Estimate = Physical Channel Bit Error Rate). 33 and 3314 of FIG. 33 illustrate messages attached to Iub CPCH data frames 3313 and 3315. The CRCI is attached to each transport block, and CPCH data frames 3313 and 3315 transmitted through the Iub are transmitted to the 3321 RNC for each TTI.

For convenience of description of the embodiment of the present invention, the 3321 RNC is assumed to be a DRNC. The DRNC3321 receives the 3313 and 3315 IUb CPCH data frames transmitted from the Node B 3311 and interprets the SRNTI value by analyzing a header of the transport block in the data frame. The SRNTI value is a temporary identifier given to distinguish a subscriber device from an SRNC. When the SRNTI is connected to a subscriber device by the SRNC, the SRNC assigns one SRNTI to the corresponding subscriber device. Using the SRNTI, the DRNC or the Node B can inform the SRNC which UE the current data is from. Having found the SRNTI value, the DRNC 3321 transmits the IUr data frames 3323 and 3325 to the SRNC3331 by binding the MAC-c SDU (Service Data Unit) having the header removed from the received transport block, CRCI and QE. The MAC-c is a MAC used for a common channel during media access control. The 3331SRNC of FIG. 33 analyzes Iur data frames 3323 and 3325 transmitted by the 3321DRNC to obtain information necessary for outer loop power control of the CPCH. The necessary information may be QE or CRCI of the reverse PCPCH. Eb / No may be calculated using the CRCI value.

The SRNC3331 of FIG. 33 transmits an Iur control frame 3333 to the DRNC for the 3332 Eb / No value for the outer loop power control, and sends an SRNTI value to the Iur control frame to inform the DRNC3321 of the UE used for the outer loop power control. It is sent in payload part of.

Receiving the Iur control frame 3333, the DRNC interprets the SRNTI included in the payload portion of the control frame and transmits the SRNTI to the node B 3311 to which the UE belongs through an Iub control frame 3327 including Eb / No 3326. In this case, the SRNTI value or the PCPCH identifier may be added to the Iub control frame 3327 in case the node B 3311 does not distinguish which UE the received Iub control frame 3327 corresponds to.

Receiving the Iub control frame 3327, 3311 node B sets the Eb / No value transmitted from the SRNC as a reference value for reverse inner loop power control, as shown in 3316, and performs the inner loop power control. do. The inner loop power control refers to the closed loop power control that is performed only between the subscriber station and the node B.

34 is a diagram showing the structure of the 3313, 3315 Iub data frame of FIG. 33, wherein QE is a message added for the outer loop power control of the reverse PCPCH of the present invention.

FIG. 35 is a diagram illustrating the structure of the 3323 and 3325 Iur data frames of FIG. 33, wherein QE and CRCI are messages added for the outer loop power control of the reverse PCPCH of the present invention.

FIG. 36 is a diagram illustrating the structure of the 3333 control frame of FIG. 33, wherein the payload unit is a message added for the outer loop power control of the reverse PCPCH of the present invention.

FIG. 37 is a diagram illustrating the structure of the 3327 control frame of FIG. 33, wherein the payload unit is a message added for the outer loop power control of the reverse PCPCH of the present invention.

20 is a diagram illustrating a slot structure of a power control preamble (hereinafter referred to as "PC_P") transmitted from a subscriber station to the UTRAN. The PC_P has a length of 0 or 8 slots. The length of the PC_P is good in the wireless environment of the UTRAN and the subscriber device, so that the initial power setting of the reverse CPCH is not necessary or 0 when no PC_P is used in the system itself, and 8 slots in other cases. 20 is a diagram defined as the basic structure of PC_P in the current W-CDMA standard. The PC_P has two slot types and consists of 10 bits per slot. 20 of FIG. 20 is a pilot field, which is 8 bits or 7 bits depending on the slot type of PC_P, and 2003 is a field used when there is feedback information to be transmitted to the UTRAN as a feedback information field. Has a length of 20 is a field in which a power control command is transmitted, and is a field used by a subscriber station for power control of a forward link, and 2 bits are transmitted.

The UTRAN measures the transmit power of the subscriber station using the 2001 pilot field of FIG. 20 in the PC_P, and then transmits a power control command to the downlink dedicated channel configured when the reverse CPCH is set to determine the initial transmit power of the reverse CPCH. To control. In the power control, if the UTRAN determines that the transmit power of the subscriber device is low, the UTRAN transmits a power up command.

An embodiment of the present invention provides a method of using PC_P for the purpose of checking CPCH setting in addition to the above purpose. The reason for confirming the CPCH setting is as described below. When the UTRAN transmits a channel assignment message to the subscriber device, there may be a case in which the channel assignment message may be received due to an error in the wireless assignment environment between the UTRAN and the subscriber device or the multipath environment may be poor and thus may be received by the subscriber device. If such a case occurs, a subscriber station that incorrectly receives a channel assignment message may use a CPCH that is not specified by UTRAN, thereby causing a collision on the reverse link with the subscriber device using the CPCH. Such a collision may occur even when the subscriber station incorrectly misunderstands the NAK transmitted by the UTRAN as an ACK, even in the conventional technology requiring the channel permission. Therefore, in the embodiment of the present invention, by providing a method of requesting the UTRAN to confirm the channel message once again, the subscriber station can increase the reliability in using the reverse CPCH.

As described above, the method in which the subscriber device reconfirms the channel allocation message or the channel request message to the UTRAN as PC_P does not affect the purpose of power control by measuring the reception power of the reverse link, which is the original purpose of PC_P. The pilot field of the PC_P is information known to the UTRAN, and since the value of the channel assignment confirmation message transmitted from the subscriber station to the UTRAN is also known to the UTRAN, it is not difficult to measure the reception power of the reverse link. In the above description, if the UTRAN performs a procedure for measuring the reception power of the reverse link, and the pilot bits known to the UTRAN are not demodulated, the UTRAN may receive an error in the channel assignment message or channel permission message transmitted to the subscriber station. Immediately, the transmission power lowering command of the reverse link is continuously transmitted to the downlink dedicated channel corresponding to the reverse CPCH in one-to-one correspondence. Since the transmit power down command is currently specified to transmit 15 times in one frame for 10 ms in the WCDMA standard, at least 15 dB of transmit power decreases within 10 ms at the time of an error, and thus does not seriously affect other subscriber stations. Do not.

FIG. 21 is a diagram illustrating a generation structure of PC_P of FIG. 20. 21101 of FIG. 21 is PC_P and has the same structure as that of FIG. The channel code 2103 of FIG. 21 channel spreads PC_P through a 2102 multiplier, and is a channel code having a spread rate of 256, and is set according to a rule defined by a CA message transmitted from UTRAN. 2105 of FIG. 21 illustrates a PC_P frame, which is composed of 8 slots, and one slot has a length of 2560 chips. 21 is a reverse scrambling code used for PC_P and spreads 2105 PC_P frames through multiplier 2106. The spread PC_P frame is transmitted to the UTRAN.

FIG. 22A illustrates an example of a method of transmitting a channel allocation confirmation message or a channel use request confirmation message to a UTRAN by using a PC_P described above. In FIG. 22A, the 2201 PC_P, 2203 channel code, 2205 PC_P frame, and 2207 reverse scrambling code operate in the same structure as the 2101 PC_P, 2103 channel code, 2105 PC_P frame, and 2107 reverse scrambling code of FIG. 21. The 2206 multiplier also performs the same operation as the 2102 multiplier and 2106 multiplier of FIG. In the method of transmitting a channel allocation confirmation message or a channel usage request confirmation message to PC_P in FIG. 22A and transmitting the same to the UTRAN, the channel number or signature number of the CA-ICH received from the UTRAN in the pilot field of PC_P of 2201 of FIG. It is multiplying repeatedly. 2209 of FIG. 22A is a CPCH confirmation message, which is a signature number or CPCH channel number used in a CA-ICH transmitted from a UTRAN to a subscriber device. When the signature number is used, a CPCH per signature used in CA-ICH is used. When the corresponding CPCH channel number is used one by one, when a plurality of signatures correspond to one CPCH. The 2209 signature number or CPCH channel number of FIG. 2 is repeatedly multiplied by the pilot field of PC_P through multiplier 2208 and transmitted.

22B illustrates a structure of reverse scrambling codes used by a plurality of subscriber stations in the UTRAN in the AP, CD_P, PC_P, and CPCH message parts when the PC_P is transmitted using the method of FIG. 22A. 2221 of FIG. 22B is a scrambling code used for an AP, which is a scrambling code that the UTRAN informs a subscriber device in the UTRAN through a broadcast channel or a scrambling code used for the AP part in the entire system. The scrambling code used for 2223 CD_P of FIG. 22B may be used by changing the starting point of the scrambling code having the same initial value as 2221, or when the set of signatures used for the AP and CD_P are different, the same scrambling code is used for the AP. . 2225 of FIG. 22B is a scrambling code used for PC_P, which is a scrambling code notified to UTRAN by the subscriber device, or a scrambling code used for the PC_P part in the entire system. The scrambling code used for the PC_P part may be the same scrambling code as the scrambling code used for the AP and CD_P part, or may be a different code. 2227, 2237, and 2247 of FIG. 22B are scrambling codes used when the subscriber station # 1, the subscriber station # 2, and the subscriber station #k using the CPCH in the UTRAN transmit the CPCH message unit, and the scrambling codes are the subscriber station. The number of subscriber stations using the CPCH in the UTRAN or the number of CPCHs in the UTRAN may be set.

In FIG. 22B, when the number of reverse scrambling codes used by the UTRAN for CPCH is not allocated per CPCH channel or for each subscriber device, the number of scrambling codes used in the message unit is the number of subscriber devices that simultaneously use CPCH in the UTRAN. The number may be smaller than the number of CPCHs in the UTRAN.

23 shows another example of a method of transmitting a channel allocation confirmation message or a channel use request confirmation message to a UTRAN by using a PC_P. In FIG. 23, 2301 PC_P, 2303 channel code, 2305 PC_P frame, and 2307 reverse scrambling code have the same structure and operation as 2101 PC_P, 2103 channel code, 2105 PC_P frame, 2107 reverse scrambling code of FIG. 21, and 2302 multiplier, The 2306 multiplier also performs the same operation as the 2102 multiplier and 2106 multiplier of FIG. In FIG. 23, a method of transmitting a channel allocation confirmation message or a channel usage request confirmation message to PC_P and transmitting the same to the UTRAN is performed before spreading the 2305 PC_P frame of FIG. After multiplying the CPCH acknowledgment message, it is spread with a scrambling code 2307 and transmitted. In the above description, even if the order in which the PCCH frame multiplies the CPCH confirmation message and the scrambling code is changed, the same performance is obtained. The CPCH confirmation message is a signature number or CPCH channel number used in a CA-ICH transmitted from a UTRAN to a subscriber device. When the signature number is used, one CPCH per signature used in CA-ICH corresponds. to be. The CPCH channel number is used when a plurality of signatures correspond to one CPCH. In the method of FIG. 23, the environment in which subscriber devices in the UTRAN use scrambling codes is the same as that of the method proposed in FIG. 22A.

24A and 24B illustrate another example of a method of transmitting, by a subscriber device, a channel allocation confirmation message or a channel usage request confirmation message to a UTRAN using PC_P. In FIG. 24A, the 2401 PC_P, 2405 PC_P frame, and 2407 reverse scrambling code have the same structure and operation as the 2101 PC_P, 2105 PC_P frame, and 2107 reverse scrambling code of FIG. 21. Multiplier, 2106 Performs the same operation as multiplier. In the method of transmitting a channel assignment confirmation message or a channel usage request confirmation message to the UTRAN in the PC_P proposed in FIGS. 24A and 24B, the CA-ICH received by the subscriber device from the UTRAN has received the 2403 channel code of FIG. 24A. By one-to-one correspondence with the signature or CPCH channel number, the channel code is used to spread PC_P and then transmitted to the UTRAN. In the method of FIGS. 24A and 24B, the environment in which subscriber devices in the UTRAN use scrambling codes is the same as that of FIG. 22B.

24B is a diagram illustrating an example of a tree of PC_P channel codes corresponding one-to-one with a signature or CPCH channel number of CA-ICH. The channel code tree is called an Orthogonal Variable Spreading Factor Code Tree in the WCDMA standard, and the OVSF code tree defines an orthogonal code according to spreading rate. The spreading rate of the channel code 2433 used as the PC_P channel code in the OVSF code tree 2431 of FIG. 24B is fixed to 256, and a mapping rule for one-to-one correspondence between the PC_P channel code and the CA-ICH signature or CPCH channel number Can be young. As an example of the mapping rule, the channel code at the bottom of the channel codes having a spread rate of 256 and the signature of the CA-ICH or the CPCH channel number may be corresponded one-to-one, and the channel code at the top and the signature of the CA-ICH may be one-to-one. The CPCH channel numbers can be associated one-to-one, or the channel codes can be changed in order or skipped several times. In FIG. 24B, n may be the number of signatures of the CA-ICH or the number of CPCH channels.

FIG. 25A illustrates another example of a method of transmitting a channel allocation confirmation message or a channel use request confirmation message to a UTRAN by using the PC_P described above. In FIG. 25A, the 2501 PC_P, 2503 channel code, and 2505 PC_P frame have the same structure and operation as the 2101 PC_P, 2103 channel code, and 2105 PC_P frame of FIG. 21, and the 2202 multiplier and the 2206 multiplier also have the 2102 multiplier of FIG. 21. 2106 Same operation as multiplier. In FIG. 25A, a method of transmitting a channel assignment confirmation message or a channel usage request confirmation message to PC_P and transmitting the same to the UTRAN is performed by using the 2507 reverse scrambling code of FIG. 25A to the channel number or signature number of the CA-ICH received from the UTRAN. Correspondingly, 2505 PC_P frames are spread and transmitted using the reverse scrambling code. The UTRAN receiving the PC_P frame transmitted by the subscriber station checks whether the scrambling code used for the PC_P frame and the signature or CPCH channel number transmitted by the UTRAN through CA-ICH are in one-to-one correspondence. A reverse link transmit power lowering message is transmitted to a power control command field of a downlink dedicated channel corresponding to the reverse CPCH used by the subscriber device in a one-to-one correspondence.

FIG. 25B is a diagram illustrating a structure of reverse scrambling codes used by a plurality of subscriber stations in the UTRAN in the AP, CD_P, PC_P, and CPCH message parts when the PC_P is transmitted using the method of FIG. 25A. 25B of FIG. 25B is a scrambling code used for an AP, and a scrambling code used by the UTRAN to notify a subscriber device in the UTRAN through a broadcasting channel or a scrambling code used for the AP part in the entire system. The scrambling code used for the 2523 CD_P of FIG. 25B may be different from the starting point of the scrambling code having an initial value equal to 2521, or the same scrambling code may be used when the set of signatures used for the AP and the CD_P is different. . 2525, 2535, and 2545 of FIG. 25B are scrambling codes used when the subscriber device # 1, the subscriber device # 2, and the subscriber device #k transmit PC_P, and indicate the signature of the CA-ICH received from the UTRAN or the CPCH. It is a scrambling code that has a one-to-one correspondence with a channel number. The scrambling code may store a scrambling code used for the PC_P by the subscriber device, and the UTRAN may inform the subscriber device. The 2525, 2535, and 2545 PC_P scrambling codes may be the same scrambling codes as the scrambling codes used in the 2527, 2537, and 2547 CPCH message parts, or may be one-to-one corresponding scrambling codes. K in FIG. 25B may be the number of CPCHs in the UTRAN.

26 and 27 are flowcharts of operations of a subscriber station and a UTRAN according to an embodiment of the present invention.

Referring to FIG. 26A, when data to be transmitted to the CPCH is generated in step 2601, the subscriber device acquires information on the maximum data rate that can be used by monitoring the CSICH in step 2602. The information that can be transmitted through the CSICH in step 2602 may be information about whether or not the data rate can be supported by the CPCH. In step 2602, the subscriber device that has obtained the information about the CPCH of the UTRAN selects an appropriate ASC based on the information obtained through the CSICH and the property of the data to be transmitted in step 2603, and selects a valid CPCH-AP subchannel group in the selected ASC. In step 2604, a valid access slot is arbitrarily selected in the frames of SFN + 1 and SFN + 2 using the SFN and the number of the CPCH-AP subchannel group of the current BS downlink transmission frame. The subscriber station that selects the access slot randomly selects a signature suitable for the transmission rate of data to be transmitted by the subscriber device in step 2605 from among the signatures capable of transmitting the information, and selects a desired transport format (TF) and persistence in step 2606. After performing the initial delay for the inspection and the AP (transmission), and setting the number of repetitive transmission and the initial transmission power of the AP in 2607, the AP is transmitted in 2608. The subscriber device that has transmitted the AP waits for an ACK for the AP transmitted by the subscriber device at 2609. If the subscriber station does not receive the ACK in step 2609, the subscriber station checks whether the number of AP repeated transmissions set in 2607 has been exceeded in step 2631. The transmission stops the CPCH access process and performs an error recovery process. In 2631, an excess check for the number of AP repeated transmissions may be performed using a timer. If the number of AP repeated transmissions is not exceeded in step 2631, the subscriber station selects a new access slot defined in the CPCH-AP subchannel group in step 2633, and selects a new signature among valid signatures in the selected ASC in step 2603 selected in step 2634. Select or reselect the signature selected in 2605. The subscriber station performs the process 2608 after resetting the transmission power of the AP in 2635.

If the subscriber station receives the ACK in step 2609 of FIG. 26A, the subscriber device selects an arbitrary signature to be used for the CD_P from the set of preamble signatures and selects an access slot to transmit the CD_P in step 2610. The access slot for transmitting the CD_P may be an arbitrary time point after the subscriber apparatus receives the ACK, or may be a fixed time point. The subscriber station selecting the access slot in step 2610 transmits the CD_P in 2611. A of FIG. 26A is connected to A of FIG. 26B.

In operation 2612 of FIG. 26B, the operation performed by the subscriber device differs depending on whether the subscriber device receives an ACK through the CD-ICH. The reception time for the ACK and the CA message for the CD-P in 2626 may be checked using a timer, and the CD_P received by the subscriber device in 2612 does not receive a response to the ACK within a predetermined time. If the subscriber station receives the NAK, the subscriber station performs process 2641. In step 2641, the subscriber device transmits an error occurrence system response to an upper layer to stop the CPCH access procedure and perform an error recovery process. In step 2612, if the subscriber device confirms the ACK for the CD_P, the subscriber device interprets the CA message in step 2613. The ACK and CA messages for the CD_P may be simultaneously detected and interpreted using the structure of the receiver of the AICH of FIGS. 16 and 17 according to an embodiment of the present invention.

In accordance with the CA message interpreted in step 2613, the subscriber station performs a reverse scrambling code and a reverse scrambling code for the message portion of the common common physical channel (hereinafter referred to as "PCPCH") as indicated by the CA message interpreted in step 2614. The channel code is determined, and the channel code of the downlink-oriented channel set for power control of the CPCH is determined. At 2615, the subscriber station checks whether the number of slots or time information of the power control preamble PC_P is 8 or 0. If the number of slots of the PC_P is 0, the subscriber station performs reception of the downlink dedicated channel transmitted by the base station in step 2619. If the number of slots of the PC_P is 8, step 2617 is performed. In step 2617, the subscriber device determines the slot scrambling code, the reverse channel code, and the slot format to be used for the PC_P, and configures the PC_P. There are two slot types of the PC_P, which are system information in the UTRAN or selected by the subscriber device.

In step 2618 of FIG. 26B, the subscriber device transmits PC_P and simultaneously receives a downlink dedicated channel to start transmission power control of the reverse link and reception power control of the forward link. At 2620, the subscriber device configures the PCPCH message unit based on the CA message interpreted at 2613 and starts transmission of the CPCH message unit at 2621. FIG. B of FIG. 26B is connected to b of FIG. 26C.

In 2622 of FIG. 26C, the subscriber device confirms whether the transmission is in the acknowledgment transmission mode, and if the transmission is not in the acknowledgment transmission mode, performs the procedure 2625 after the transmission of the PCPCH message unit is completed. The completion status response is transmitted to the upper layer, and the process of data transmission through the CPCH is terminated at 2626. If the transmission of the acknowledgment transmission mode (Acknowledgement transmission mode) in the 2622, the subscriber station sets a timer for receiving the ACK of the CPCH message unit at 2623, the forward access channel (hereinafter referred to as "FACH") during and after transmission of the CPCH message unit The UTRAN monitors whether the ACK or NAK is transmitted from the UTRAN to the message part of the CPCH. In addition to the FACH, the downlink dedicated channel may be used for ACK or NAK transmission from the UTRAN. If the subscriber station fails to receive an ACK for the CPCH message unit through the FACH in step 2624, the subscriber station determines whether the timer has been discarded or not by referring to the timer set in step 2623 in step 2651. If the timer has not been discarded, return to 2624 to monitor ACK or NAK transmission from UTRAN; if the timer is expired at 2651, transmit a PCPCH transmission failure status response to a higher layer at 2652, perform an error recovery process, and If the subscriber station receives the ACK at 2624, the process 2625 and 2626 described above are performed to terminate transmission of the CPCH.

The operation of the UTRAN corresponding to the operation of CPCH transmission of the subscriber device of FIG. 26 is illustrated in FIG. 27.

In step 2701 of FIG. 27A, the UTRAN carries information on the maximum data rate supported by the CPCH or the availability of each data rate of the CPCH in the CSICH, and transmits the information to the AP received from the subscriber device in the UTRAN in step 2702. Monitor access slots for reception. Step 2703 is a process for determining whether the UTRAN detects the AP while monitoring the access slot. In step 2703, if the UTRAN does not detect an AP, the process repeats step 2702. If the AP detects an AP, it determines whether or not two or more APs are detected or received in 2704. If it is determined in step 2704 that two or more APs are detected, an appropriate AP is selected from the detected APs, and step 2705 is performed. If only one AP is received in step 2704, and the requirements for the CPCH contained in the received power of the received AP or the signature of the received AP determine that the UTRAN is suitable, step 2705 is performed. The requirement may be a data rate that the subscriber device wants to use for CPCH, a frame number of data to be transmitted by the subscriber, or a combination of the two pieces of information.

For example, the UTRAN may be a sum of maximum aggregate data rates for all PCPCHs included in the UTRAN as an example of a criterion for determining a requirement of CPCH contained in a signature of an AP transmitted by a subscriber device. The sum of the transmission data rates is the total data transmission rate allowed by the UTRAN to the CPCH set in the UTRAN. The example in which the UTRAN determines whether to use the CPCH required by the subscriber device using the sum of the transmission data rates is as follows. Same as

It is assumed that the UTRAN allocates a transmission rate of 20 Mbps to each CPCH set it has. The above assumption is an assumption for better understanding of the embodiment of the present invention, and the UTRAN may give a total data rate differently for each CPCH set. The subscriber station selects a CPCH set and transmits the AP in consideration of the information possessed by the subscriber station and information such as the number of frames, transmission rate, and type of data to be transmitted by the subscriber station, and the transmission rate of the CPCH requested by the AP is Assume 2 Mbps. Upon receiving the transmitted AP, the UTRAN looks at the sum of the maximum transmission data rates of the CPCHs allowed by the UTRAN to the CPCHs currently used in the CPCH set requested by the subscriber device, and the data rates of the CPCHs available in the CPCH set. . If the sum of the maximum transmission rates of the currently used CPCHs exceeds 18 Mbps, the UTRAN should transmit a NAK to the AP transmitted by the subscriber device. If the sum of the maximum transmission rates of the currently used CPCHs is less than 18 Mbps, The UTRAN may transmit an ACK for the transmitted AP.

When the UTRAN sets a total data rate for CPCH sets that it has, the UTRAN may use a total data rate fixed allocation method and a flexible allocation method. In the fixed allocation method, if the total data rate is determined, the CPCH set may be configured with CPCHs having a predetermined transmission rate, such as several CPCHs having a 1Mbps rate, some CPCHs having a 500kbps rate, and the like within the predetermined data rate. have. On the other hand, the example of the flexible allocation method refers to a method of properly allocating according to the transmission rate of the CPCH required by the subscriber device without setting a specific data rate for each CPCH as in the embodiment of the present invention described above.

In 2705 of FIG. 27A, the UTRAN generates an AP-AICH for ACK transmission for the detected or selected AP, and transmits the signal in 2706. The subscriber station transmitting the AP-AICH monitors the access slot in order to receive the CD_P at 2707. The AP may be received in the process of monitoring the access slot to receive the CD_P. That is, the UTRAN may simultaneously receive the CD_P and the AP. If CD_P is detected in 2708 of FIG. 27A, 2709 is performed. In the monitoring process, a timer may be used if the subscriber station transmits the CD_P at a fixed time after the AP-AICH, and a searcher may be used if it transmits at any time. 2709 of FIG. 27A is an operation of determining whether two or more CD_Ps are detected when the UTRAN detects CD_Ps. If two or more CD_Ps are detected, a process of selecting an appropriate CD_P from among the received CD_Ps is performed, followed by step 2710. The criterion for selecting the CD_P may be the reception power of the CD_P received by the UTRAN. If there is only one CD_P received in step 2709, step 2710 is performed. Step 2710 is a process in which the UTRAN generates an appropriate channel allocation message in consideration of the AP transmitted by the subscriber station transmitting the CD_P selected or detected by the UTRAN. A of FIG. 27A is connected to a of FIG. 27B.

In 2711 of FIG. 27B, the UTRAN generates an ACK for the CD_P detected in 2708 and a CD / CA-ICH for CA message transmission generated in 2710. In the method of generating the CD / CA-ICH, the method described in FIG. 13 may be used. The CA / CD-ICH generated in step 2711 is transmitted in step 2712, and the method of FIG. 14 and FIG. 15 described in the embodiment of the present invention may be used. The UTRAN transmitting the CD / CA-ICH creates a forward dedicated channel for power control of the reverse CPCH. The generated forward dedicated channel corresponds one-to-one with the reverse CPCH transmitted by the subscriber device. The UTRAN transmits the DL_DPCH generated in 2713 at 2714 and checks the slot number or time information of the PC_P transmitted by the subscriber device at 2715. If the slot number or time information of the PC_P transmitted by the subscriber device is 0 at 2714, the UTRAN starts receiving the message part of the PCPCH transmitted by the subscriber device at 2719, and the slot number or time information of the PC_P transmitted by the subscriber device is If 8, go to step 2716. In step 2716, the UTRAN receives the PC_P transmitted by the subscriber device. This is a process of generating a power control command for power control of PC_P. The purpose of power control of the PC_P is to appropriately adjust the initial transmit power of the reverse PCPCH transmitted by the subscriber. The UTRAN transmits the power control command generated at 2716 through a power control command field of a downlink dedicated physical control channel (DL_DPCCH) among the forward dedicated channels generated at 2713. The UTRAN determines whether reception of PC_P has ended in 2718 of FIG. 27B, and if not finished, performs 2717. Whether reception of the PC_P is terminated may be performed by checking whether the PC_P 8 slot has arrived by using a timer. When the UTRAN confirms that transmission of PC_P is terminated at 2718, the UTRAN starts receiving a message part of the reverse PCPCH at 2719 and determines whether or not to receive the message part of the reverse PCPCH at 2720. If the transmission of the PCPCH message part is not terminated in the determination of the termination, the UTRAN continues to receive the PCPCH, and if so, performs step 2721 of FIG. 27C. B of FIG. 27C and B of 27C are connected.

In 2711 of FIG. 27C, the UTRAN determines whether the PCPCH transmission of the subscriber device is in an acknowledgment transmission mode, performs 2722 if the acknowledgment transmission mode is performed, and if it is not an acknowledgment transmission mode. In step 2724, CPCH reception is terminated.

If the PCPCH transmission of the subscriber equipment is the acknowledgment transmission mode in 2721, the UTRAN checks the error of the message part of the PCPCH received in 2722, and if an error occurs, performs process 2751 to forward access channel (Forward Access). Channel) After transmitting NAK through FACH, if no error occurs, perform process 2723 to transmit ACK through Forward Access Channel (hereinafter referred to as “FACH”), and then stop receiving CPCH in process 2724. do.

28A-28B and 29A-29C illustrate a method of setting and using a stable CPCH using PC_P described in the description of FIGS. 22A and 22B, 23, 24A and 24B, 25A and 25B. The operation of the subscriber station and the UTRAN is described with reference to FIG.

28A is connected to FIG. 26A. In step 2801 of FIG. 28A, the subscriber device determines whether a CD / CD-ICH is received from the UTRAN and takes two operations. If the subscriber station does not receive the CD / CA-ICH from the UTRAN in step 2801, the subscriber device stops the CPCH access procedure by transmitting an error-prone system response to the upper layer in step 2821. And perform the error recovery process. Not receiving the CD / CA-ICH includes a case where the CD / CA-ICH is received but no ACK is transmitted to the CD-ICH, and a case where the CD / CA-ICH is not received from the UTRAN within a predetermined time. . In this case, the predetermined time is a time set in advance while starting a CPCH access procedure, and may operate by setting a timer.

In contrast, the subscriber station receiving the CD / CA-ICH in step 2801 and confirming the ACK in the CD-ICH interprets the CA message in step 2802. When the interpretation of the CA message is completed in step 2802, the subscriber station proceeds to step 2803 to perform power control of the reverse scrambling code, the reverse channel code, and the reverse CPCH of the PCPCH message part as indicated by the interpreted CA message. Check the channel code of the forward dedicated channel.

In step 2804 of FIG. 28A, the PC_P is configured according to the slot format using the reverse scrambling code and the reverse channel code set in step 2803. At this time, in the embodiment of the present invention, in the method of increasing the stability and reliability of the CPCH using the PC_P, the length or timing value of the PC_P slot is always 8 slots.

In step 2805 of FIG. 28A, a CA Assignment Confirmation message is inserted into PC_P to confirm or verify the CA message received by the subscriber device. The method of inserting the CA verification message into the PC_P may use the methods of FIGS. 22A and 22B, 23, 24A and 24B, 25A and 25B described in the embodiment of the present invention. The method used in FIGS. 22A and 22B is a method of multiplying a pilot bit of PC_P by a CA message or a signature number received by the subscriber device, and the method used in FIG. 23 is received by the subscriber device at the chip level in the PC_P slot. It is a method of multiplying one CA message or signature number and sending it. In addition, the method used in FIG. 24 is a method of channelizing PC_P with a channel code corresponding to a CA message or signature number received by the subscriber device, and the method used in FIG. 25 is a CA message received from the subscriber device. A method of spreading PC_P with a scrambling code corresponding to a signature number and transmitting it to the UTRAN. When the CA message or signature number is used, when the UTRAN transmits the CA message using multiple signatures, the CA uses the CA message for the CPCH allocated by the subscriber station, and when the CPCH is allocated using one signature. Use the signature number in the CA confirmation message.

In step 2806 of FIG. 28A, the PC_P generated in step 2805 is transmitted to the UTRAN. In step 2807, reception of the DL_DPCH transmitted by the UTRAN is started. In addition, the forward received power is measured using the pilot field of the DL_DPCH, and the command for controlling the UTRAN forward transmit power is inserted into the power control command of the PC_P by the measured received power.

In step 2808 of FIG. 28A, an error signal or a specific PCB pattern requesting for CPCH release is received for the CA message interpreted by the subscriber device from the UTRAN. If it is confirmed in step 2808 that an error occurs in the reception of the CA message by the subscriber device, the process proceeds to step 2831 and stops the transmission of the PC_P. In step 2832, the PCPCH transmits a status response of the PCPCH to the upper layer. After the transmission, the error recovery process is performed.

On the contrary, when a message regarding a CA message reception error or a specific PCB pattern is not received from UTRAN in step 2808, the process proceeds to step 2809 of FIG. 28A to configure a message part of PCPCH as indicated by the interpreted CA message. .

Meanwhile, FIG. 28A is connected to FIG. 28B.

The subscriber station starts transmission of the PCPCH message part generated in step 2809 of FIG. 28A in step 2810 of FIG. 28B. On the other hand, the subscriber device performs step 2811 of FIG. 28B even during transmission of the PCPCH message part. Operation 2811 performs the same operation as operation 2808 of FIG. 28A. On the other hand, in step 2811, upon receiving an error confirmation message or a channel release request message for a CA message from the UTRAN, the subscriber device performs operations according to steps 2841 and 2842 of FIG. 28B. In step 2841, the subscriber device stops transmitting the PCPCH message part. In step 2842, the subscriber device performs an error recovery process after performing a PCPCH transmission stop status response to the upper layer. There may be two kinds of the channel release request message. The first is a message that is transmitted late because the UTRAN checks the CA message late in the UTRAN for the currently configured CPCH, and after the PCPCH transmission starts, the UTRAN notices that the currently set CPCH has collided with the CPCH of another subscriber station. Second, an error occurs in a CA message received by another subscriber station using CPUT of UTRAN, and another subscriber station starts transmission to CPCH where subscriber station is currently communicating with UTRAN. This is a case where a collision message with another subscriber device is transmitted to the subscriber device in use. In either case, the UTRAN stops the use of the reverse CPCH of the subscriber equipment that is correctly used for the stability of the system and the subscriber equipment that received the CA message incorrectly.

In contrast, in step 2811 of FIG. 28B, the subscriber device that does not receive an error signal for the CA message or a specific PCB pattern requesting channel release from the UTRAN proceeds to step 2812. The subscriber station proceeds to step 2812 and continues to transmit the message part of the PCPCH, and in step 2813 it determines whether or not to terminate the transmission for the PCPCH message part. If the transmission is not terminated by the determination, the process returns to step 2812 to continue the above-described operation. If the transmission is terminated by the determination, the operation of step 2814 is performed.

In step 2814 of FIG. 28B, the subscriber station confirms whether the transmission is in an acknowledgment transmission mode. If the acknowledgment transmission mode is not transmitted in the acknowledgment step, after the PCPCH message unit is transmitted, step 2817 is performed to transmit the PCPCH transmission completion status response to the upper layer, and then transmit data through CPCH. To exit. In contrast, in step 2814, the subscriber station sets a timer for receiving an ACK message from the CPCH in step 2615, if the transmission is in the acknowledgment transmission mode. In addition, the subscriber station monitors a forward access channel (hereinafter referred to as "FACH") during and after transmission of the CPCH message unit in step 2816 to determine whether to transmit ACK or NAK from the UTRAN to the message unit of the CPCH. Check it. In addition to the FACH, the downlink dedicated channel may be used for ACK or NAK transmission from the UTRAN. If the subscriber station fails to receive an ACK for the CPCH message unit through the FACH in step 2816, the subscriber device determines whether the timer has been discarded or not by referring to the timer set in step 2615 in step 2851. If the timer has not been discarded in step 2851, the process returns to step 2816 to monitor ACK or NAK transmission from the UTRAN. If the timer is discarded in step 2851, the PCPCH transmission failure status response is transmitted to a higher layer in step 2852, and an error recovery process is performed. On the contrary, if the subscriber station receives the ACK in step 2816, the CPCH is terminated after performing step 2817 described above.

29A to 29C are diagrams illustrating the operation of the UTRAN corresponding to the operation of the subscriber device of FIG. 28.

29A is connected to FIG. 27A.

In step 2901 of FIG. 29A, the UTRAN generates an ACK for the CD_P detected in step 2708 of FIG. 27A and a CD / CA-ICH for CA message transmission generated in step 2710. In the method of generating the CD / CA-ICH, the method described in FIG. 13 may be used. The CA / CD-ICH generated in step 2901 is transmitted in step 2902, and the method of FIG. 14 and FIG. 15 described in the embodiment of the present invention may be used. The UTRAN transmitting the CD / CA-ICH creates a forward dedicated channel for power control of the reverse CPCH. The generated forward dedicated channel corresponds one-to-one with the reverse CPCH transmitted by the subscriber device. The UTRAN transmits the DL_DPCH generated in step 2903 in step 2904, receives the PC_P transmitted by the subscriber device in step 2905, and interprets the confirmation message for the CA message received by the subscriber device. On the other hand, according to the result interpreted in step 2905, the UTRAN determines whether the CA message transmitted by the subscriber device matches the CA message transmitted by the UTRAN in step 2906. If it is determined in step 2906, the UTRAN performs step 2907, and if not, proceeds to step 2911 of FIG. 29B. The method of transmitting the CA confirmation message to the UTRAN by the subscriber device using the PC_P uses the methods of FIGS. 22A and 22B, 23, 24A and 24B, 25A and 25B described in the embodiment of the present invention. do. The method used in FIGS. 22A and 22B is a method of multiplying a pilot bit of PC_P by a CA message or a signature number received by the subscriber device, and the method used in FIG. 23 is received by the subscriber device at the chip level in the PC_P slot. It is a method of multiplying one CA message or signature number and sending it. In addition, the method used in FIG. 24 is a method of channelizing PC_P with a channel code corresponding to a CA message or signature number received by the subscriber device, and the method used in FIG. 25 is a CA message received from the subscriber device. A method of spreading PC_P with a scrambling code corresponding to a signature number and transmitting it to the UTRAN. When the CA message or signature number is used, when the UTRAN transmits the CA message using multiple signatures, the CA uses the CA message for the CPCH allocated by the subscriber station, and when the CPCH is allocated using one signature. Use the signature number in the CA confirmation message.

29A and 29 are connected.

In step 2921 of FIG. 29B, the UTRAN determines whether another subscriber station uses a CPCH corresponding to the CA confirmation message received in step 2905 of FIG. 29A. If it is determined in step 2921 that the other subscriber device is not in use, the UTRAN performs step 2925. In step 2925, the UTRAN reports a PCPCH transmission stop status response to an upper layer, and then performs an error recovery process. The error recovery process performed by the UTRAN means transmitting a CPCH transmission stop message to a subscriber device through a downlink dedicated channel currently received by the subscriber device, or transmitting a CPCH transmission stop message to a subscriber device through a FACH or a subscriber device. And a method of causing a subscriber station to stop CPCH transmission by continuously transmitting a specific bit pattern promised. The error recovery process may also include a method in which the UTRAN continuously transmits a command for lowering the reverse transmission power of the subscriber device to the DL_DPCH received by the subscriber device.

In step 2921 of FIG. 29B, if the UTRAN determines that another subscriber device is using a CPCH corresponding to the CA confirmation message received in step 2905 of FIG. 29A, the UTRAN performs step 2922, and the two subscriber devices are common to each other. The subscriber station transmits a power down command through the DL_DPCH. In addition, the UTRAN proceeds to step 2923 and transmits a channel release message or a specific PCB pattern to two subscriber stations through the FACH to perform channel release. A channel for transmitting the channel release message or a specific PCB pattern may use a downlink dedicated channel in addition to the FACH. After performing step 2923, the UTRAN stops transmitting the DL_DPCH transmitted to the subscriber device in step 2924, and then performs step 2925 described above, and then ends the reception of the CPCH.

In contrast, if the CA confirmation message received from the subscriber device in step 2906 of FIG. 29A matches the CA message allocated by the UTRAN, the UTRAN performs step 2907.

In step 2907, the UTRAN receives the PC_P transmitted by the subscriber device. This is a process of generating a power control command for power control of PC_P. The purpose of power control of the PC_P is to appropriately adjust the initial transmit power of the reverse PCPCH transmitted by the subscriber. The UTRAN transmits the power control command generated in 2907 through a power control command field of a downlink dedicated physical control channel (hereinafter, referred to as "DL_DPCCH") of the forward dedicated channel generated in 2903. . The UTRAN determines whether reception of PC_P is terminated in step 2909 of FIG. 29A, performs step 2908 if it is not terminated, and performs step 2910 if terminated. Whether reception of the PC_P is terminated may be performed by checking whether the PC_P 8 slot has arrived by using a timer. If the UTRAN confirms that the transmission of PC_P is terminated in step 2909, the UTRAN starts receiving the message part of the reverse PCPCH in step 2910, and determines whether the reception of the message part of the reverse PCPCH is terminated in step 2911. If the transmission of the PCPCH message part is not terminated in the determination of the termination, the UTRAN continues to receive the PCPCH, and if so, performs step 2912 of FIG. 29C. 29B and 29C are connected.

In step 2912 of FIG. 29C, the UTRAN determines whether the PCPCH transmission of the subscriber device is in an acknowledgment transmission mode, and if an acknowledgment transmission mode, performs the step 2913, and the acknowledgment transmission mode. ), The process proceeds to step 2715 to terminate CPCH reception.

If the PCPCH transmission of the subscriber station is the acknowledgment transmission mode in step 2912, the UTRAN checks the error of the message part of the PCPCH received in step 2913, and if an error occurs, performs step 2931 to perform the forward access channel ( The NAK is transmitted through the Forward Access Channel (FACH), and if an error does not occur, step 2914 is performed to transmit the ACK through the Forward Access Channel (FACH), and then the reception of the CPCH is terminated.

32 is a diagram illustrating an operation of a medium access control layer (hereinafter, referred to as " MAC ") of a subscriber device according to an embodiment of the present invention. 32, the MAC layer receiving the MAC-Data-REQ primitive from the Radio Link Control (RLC) in 3201 of FIG. 32 has a variable M value and a transmitted frame required to count a preamble romping cycle in 3202. Initialize the variable FCT (Frame Counter Transmitted) needed to count the number to 0. The preamble romping cycle is a time for how many times the access preamble is transmitted. 3203 of FIG. 3 is a process in which the MAC layer acquires a parameter required for transmitting a CPCH from RRC (Radio Resource Control). The necessary parameter may be a persistence value Ps, NFmaxs, and a back-off time (hereinafter, referred to as “BO”) given for each data rate. The MAC layer increases the Preamble Romping Cycle Counter M in 3204 of FIG. 32, and compares the CPCH if M is greater than the NFmax at 3205 compared to NFmax obtained from RRC at 3203. Abort the acquisition process and perform 3241 error correction. The error correction process may be a process of transmitting a CPCH acquisition failure message to a higher layer than the MAC layer. If M is less than NFmax in 3205, the MAC layer performs 3206. In step 3206, the MAC layer sends a PHY-CPCH_Status-REQ primitive to obtain information about channels of the PCPCH in the current UTRAN. In step 3206, information about PCPCHs in the UTRAN requested by the MAC layer may be obtained in step 3207. The obtained PCPCH information in the UTRAN may be the use of each channel, the data rate supported by the UTRAN for each PCPCH, information on the multi-code transmission, the maximum data rate that can be allocated by the current UTRAN, etc. .

32, in step 3208 of FIG. 32, the MAC layer compares the transmission rate that can be transmitted by the PCPCH obtained in step 3207 with the required transmission rate, and performs step 3209 if the transmission rate is acceptable. do. The process 3231 waits for the expiration time T until the next TTI and repeats from the process 3203.

The process 3209 of FIG. 32 is performed when the transmission rate of the desired PCPCH of the MAC matches the transmission rate of the PCPCHs in the current UTRAN, and in step 3209, the MAC desires to transmit a CPCH. Is referred to as "TF". A random value R is derived at 3210 to perform a persistence test to determine whether to attempt access to the PCPCH supporting the TF selected at 3209. The MAC layer compares R derived from 3210 and P obtained from RRC in 3203 in 3211 of FIG. 32, and performs step 3212 if R is less than P, and again from step 3231 if greater than P. do. When R is greater than P in step 3211, the following processing method is also possible. That is, a busy table that records the availability of each TF is set up, and a TF that fails the persistence test is recorded as busy, and the process is repeated again from step 3209. However, in order to select a TF which is not recorded as busy in the process of 3209, the busy table is referred to.

In step 3213 of FIG. 32, the MAC layer correctly performs an initial delay time, and in step 3213, transmits a PHY-Access_REQ primitive to the physical layer instructing the physical layer to perform a procedure of transmitting an access preamble. 32, FIG. 32 relates to an operation after receiving the PHY-Access-CNF for the PHY-Access_REQ primitive transmitted from the MAC layer in 3213. A of 3214 is an operation when the MAC has not received any response to the AP_AICH at all, and when the MAC cannot receive the AP_AICH, the MAC is re-run from step 3231. B in step 3214 is an operation when the physical layer received up to AP_AICH does not receive a response through the CD / CA-ICH after transmitting the CD_Preamble. To perform. D in step 3214 is an operation when the physical layer of the subscriber station receives the NAK from the UTRAN to AP_AICH, and the MAC layer waits for the end time T until the next TTI at 3271, and then receives a NAK from AP_AICH at 3273. -Wait for the off time TBOC2 more, and then repeat the operation from the operation 3203. E of 3214 is a process when the physical layer of the subscriber device receives a signature different from the signature sent by the CD / CA-ICH, and waits for the end time T from 3251 to the next TTI, and then goes to CD / CA_ICH at 3253. After receiving the signature different from the signature sent by the user, the user waits for the back-off time TBOC1 given again and repeats from 3203.

C of 3214 is an operation when the physical layer of the subscriber station reports to the MAC that it has received a channel allocation message in the ACK and the CA-ICH for the CD-ICH, and operations after C of 3241 are the same as 3215. In step 3215, the MAC layer of the subscriber station selects an appropriate TF to create a transport block set suitable for the selected TF.

32, FIG. 32 illustrates a process of transmitting the transport block set generated by the PHY-DATA_REQ primitive to the MAC layer of the subscriber device. In FIG. 3217 of FIG. 32, the MAC layer of the subscriber device corresponds to one TTI. The FCT is reduced by the number of frames, and the process of transmitting data on the CPCH is terminated at 3218.

Meanwhile, as described above, in order to effectively transmit packet data using a common channel such as CPCH, a scheduling method for effectively allocating and releasing channels is required. The scheduling is intended to prevent unnecessary access from the mobile station and to waste resources by quickly releasing the channel and assigning the channel to another mobile station when there is no data in any reverse channel. In order to perform the scheduling, when the data transmission ends before NF_max, the mobile station needs to inform the base station that the data transmission on the CPCH has ended.

In order to notify the end of the data transmission (End of Transmission) it is required to transmit a specific operation or a specific type of frame corresponding to the previously scheduled between the base station and the mobile station. On the other hand, when the base station receives such a specific frame from the mobile station, it recognizes that the current CPCH is terminated, releases the assigned CPCH, releases the resource of Node B, allocates a channel to another mobile station requesting CPCH, and performs effective scheduling. can do.

38 is a diagram showing the configuration of a frame for notifying end of data transmission by a mobile station to a base station according to an embodiment of the present invention.

Referring to FIG. 38, an operation of notifying whether data transmission is terminated by inserting a specific bit into a frame transmitted by a mobile station is described below. The end of frame (EOF) illustrated in FIG. 38 has a length of 1 bit as a part that can be added in a physical layer or an upper layer (MAC or RLC). The EOF bit is set when there is no more data in the transmission buffer of the mobile station, that is, when the last frame constituting the data to be transmitted is transmitted. For example, the mobile station notifies the base station that there is a continuous frame by setting the EOF bit to '0' if it is not the last transmission frame, and informs the base station that the last frame is set to '1' in case of the last frame. Meanwhile, when the EOF bit, that is, the EOF field is set to '1', the base station recognizes that data transmission is completed and releases the corresponding CPCH channel.

However, if an error occurs in a portion where the EOF field shown in FIG. 38 is set to '1' or the frame is not correctly transmitted to the base station due to an air condition, that is, a wireless environment, the base station may release the CPCH. The case occurs. In order to prevent such a case, a counter is installed in the base station to count a case where a CRC error occurs, and when an error of a specific value or more occurs, the CPCH is released and the transmission of the power control bit is stopped. When the value of the counter is greater than NF_max, the CPCH is released when the NF_max value has passed. However, in the opposite case, that is, when an error occurs in a frame in which the EOF field is set to '0' and is recognized as '1', the base station releases the CPCH and stops transmitting the power control bit. In order to solve such a problem, the mobile station generates a null frame when sending a frame having the end of data transmission set to '1', and transmits by setting the EOF portion of the null frame to '1'. Therefore, the base station needs to receive two consecutive frames in which the EOF is set to '1' in order to release the CPCH, thereby preventing the release of the unwanted channel due to an error in the EOF field.

39 shows another method for releasing a CPCH according to an embodiment of the present invention. FIG. 39 illustrates that the base station provides the length of data to be transmitted by the mobile station to the base station, and the base station compares the number of transmission frames determined by the data length with NF_max and then ends CPCH even when the number of transmission frames is smaller than NF_max. This is how you can.

Referring to FIG. 39, the operation according to another embodiment of the present invention will be described in detail as follows.

In order to inform the base station of the length of data to be transmitted, that is, the number of frames, the mobile station sets the total number of frames to be transmitted in the first frame transmitted on the CPCH and transmits the data to the base station. For this operation, the length of a frame to be transmitted must have a fixed value. That is, such a method is possible only when there is no additional data during data transmission through the CPCH because the length of the entire data is indicated in the first transmitted frame. However, additionally generated data, that is, data generated after the total number of frames is determined, must be transmitted through the next CPCH access process. Meanwhile, the base station checks the total number of frames provided from the mobile station through the first frame, and counts the number of frames received from the mobile station. The base station checks whether the number of received frames reaches the identified total number of frames. If the number of frames is received by the check, the base station releases the CPCH from which the frames were received.

40 illustrates a case in which a control frame is used to efficiently release a CPCH according to another embodiment of the present invention. On the other hand, when using a control frame, it is necessary to distinguish between a control frame and a user data frame indicating the end of data to be transmitted between the base station and the mobile station. As shown in FIG. 40, a 1-bit flag can be used to distinguish the control frame C from the data frame D. FIG.

Referring to FIG. 40, the operation according to another embodiment of the present invention will be described in detail. The base station determines whether the next received frame is a control frame (C) or a data frame (D) according to the flag value (F). Can be distinguished. In this case, the structure of the control frame may be configured in a specific pattern. For example, it can be configured as 11111 ...., 000000 ...., or 101010 .. However, as described above, since a frame structure such as a control frame may occur in general user data, flag bits for distinguishing the same may be used.

Similar to the case of using the control frame shown in FIG. 40, a specific type of transport block can be configured in the MAC layer, and the specific type of transport block can be used to release the CPCH. The following proposes a specific release method of CPCH using the method proposed in FIG.

MAC PDUs are transmitted to the physical layer within one transmission time interval (TTI), which is defined as a transport block set (TBS). The TBS consists of one or more transport blocks (TBs), and each TB consists of a MAC PDU. The TB records the amount of data transmitted in one frame to increase the use efficiency of the CPCH. The TBs are sequentially transmitted from the RLC and multiplexed with TBs generated from other logical channels. However, TBs generated in the same logical channel are sequentially transmitted from the RLC (Radio Link Control) to the physical layer.

The mobile station requesting the CPCH configures data based on TBS size, NF_max and TTI, which are parameters received from the base station. The TBS size is basically a parameter determined by the data rate. If multiplexing is not performed in the MAC layer, the TBS size is transparent in the MAC and RLC layers, and protocol control information (PCI) is not added. As described above, the TB constitutes a TBS currently transmitted as a minimum unit of data transmitted by the mobile station, and a CRC is added to the TB to perform error checking at the base station. In normal CPCH transmission, if no data is generated, TB is not configured. However, TB needs to be configured for quick release of CPCH. In this case, the configured TB is TB having a length of 0 since there is no user data transmitted from the mobile station. As such, when the TB having a size of '0' is provided, the base station may determine that data transmission of the CPCH is completed and perform the release of the CPCH. A TBS composed of one or more TBs may include a plurality of TBs having a size of '0', and the TBS includes a field including the number of TBs having a size of '0'.

As described above, the configuration of a frame using a TB having a size of '0' to be used for releasing CPCH is shown in FIG. 41. As shown in FIG. 41, when TB is '0', it means the end of CPCH. Since TB does not occur during transmission of the CPCH, as shown in FIG. 40, a flag field necessary for distinguishing a control frame from a data frame is not required.

As shown in FIG. 41, in order to use the case where the size of TB is '0' as the CPCH release method, it should be defined in advance for the CPCH release between the base station and the mobile station. However, when the base station recognizes that a frame other than 'TB size = 0' causes an error in transmission, and the " TB size = 0, " the base station releases the CPCH. In order to prevent such a problem, that is, to increase the reliability of releasing CPCH, it is necessary to send two or more cases of "TB size = 0". In order to indicate the number of TBs having two or more "TB size = 0", a field indicating the number of "TB size = 0" is needed. However, the determination of the number of TBs used for the release of CPCH is a parameter that can be determined by the base station. Therefore, the base station needs to inform the mobile station through an RRC broadcasting message of the number of "TB size = 0" to use when releasing the CPCH.

In the above description, when there is no message to be transmitted to the CPCH channel assigned by the mobile station, the UE has described an example of using a 0 transport block to inform the base station UTRAN. Defines a specific TFI of the PHY-DATA-REQ primitive that tells the end of a transmission frame at the physical layer to send a specified number of TB size = 0 to inform the UTRAN that the UE no longer has data to send on the CPCH. . The EOF is generated by the physical layer receiving the primitive.

At this time, in the above embodiment, the UE transmits a specified number of End Of Frames (EOFs) received from the URAN. This is used to allow the UTRAN to receive EOF more reliably. The above method is to transmit a signal to the UTRAN by stopping the transmission by transmitting a primitive to the physical layer on the upper layer of the UE.

However, it is also possible that the physical layer does not transmit a signal for stopping transmission to the UTRAN. That is, if a primitive indicating a zero transport format is transmitted to the physical layer as an indication that all of the data is transmitted without any data to be transmitted from the upper layer, the physical layer immediately stops transmitting. Therefore, unnecessary up-link interference can be reduced. As a result, the UTRAN knows that there is no signal from the UE, and if there is no signal for a certain period, the UTRAN determines that the UE has stopped transmitting and releases the related channel. Since the CPCH is released, the UTRAN indicates that the released channel is empty and transmits it to the CSICH for broadcasting whether the PCPCH is occupied. The UE releasing the channel may determine whether the channel is released by checking whether the channel released by the UTRAN is broadcast by the UTRAN.

Meanwhile, the UE may stop transmission through the CPCH when the CPCH in the use state is checked to be empty by monitoring the CSICH while using the CPCH. This situation may be caused by the UTRAN erroneously determining that there is no signal to the CPCH or due to the release of the channel due to an error that is misinterpreted as end of transmission.

The UE may increase the interference in unnecessary up-link by using a method of necessarily transmitting a specified number of EOFs without considering the current radio environment to report transmission termination to the UTRAN. And delays occur when other actions need to be performed.

Therefore, in the present embodiment, when the UTRAN determines the maximum number of EOFs and transmits the maximum number of EOFs to the UE, the UE actively transmits the EOF by determining the number of transmissions of the EOF according to channel conditions. Therefore, it is possible to reduce uplink interference by preventing unnecessary operations that may occur at the UE.

In addition, in the current 3GPP standard (UMTS standard), the number of information to be transmitted is reduced by defining the number of information to be added to the RRC CPCH Set Info message, which should include information necessary for the present invention, only as the maximum number of transmissions. Table 9 below shows the addition to the existing RRC Set Info message due to the present embodiment. [....] in Table 9 means omission.

Information Element / Group Name Presence Mult IE type and reference Semantics description CPCH set ID M CPCH set ID Indicates the ID number for a particular CPCH set allocated to a cell. [....] [....] [....] [....] [....] Maximum allowed Number of EOF M Integer (1 ... 15) Maximum allowed number of EOF transmission [....] [....]

When EOF transmission occurs in the UE, the number of EOF transmissions is determined according to an uplink interference level. Since the uplink interference level ranges from -110dBm to -70dBm, it can have a total of 40 uplink interference levels. In the CPCH Set Info of Table 9, when the Maximum allowed Number of EOF broadcasted is N and Step is min (40 / N), the number of transmissions is determined by Table 10 below. do.

N_EOF_TX UL Interference Level Range One (-70dBm-(Step * 1 -1) ~ -70dBm 2 (-70dBm-(Step * 2-1)) ~ (-70dBm-Step * 1) 3 (-70dBm-(Step * 3-1)) ~ (-70dBm-Step * 2) ... ... N -100

In order to inform the UE to stop data transmission using CPCH, a transmission rate information (TFCI) field of UL DPCCH may be used. If the TFCI field is used, the Node-B RRC can inform the Node-B RRC of the End of Transmission (EOT) CPCH in units of 10ms radio frames in the Physical Layer of Node-B. Termination can be performed.

To this end, the UTRAN must be signaled to map a specific Transport Format Indicator (TFI) to the EOT in a Transport Format Set (TFS) of CPCH Set Info of a broadcast message.

In addition, it should be informed how many EOT radio frames should be transmitted in an RRC message, which can be used in Table 11 below. In this case, the UE has a radio frame unit. You can send as many as. However, using Table 10, the UE may transmit an EOT radio frame according to an UL radio interference level.

If the number of EOFs determined by the UE is smaller than the maximum number of EOFs transmitted to the UE by the UTRAN, the EOF is transmitted by the number determined by the UE. However, if the maximum number of EOFs transmitted by the UTRAN is smaller than the number of EOFs determined by the UE, the maximum number of EOFs transmitted by the UTRAN is transmitted.

Alternatively, the UE may determine the number of EOFs and transmit it to the UTRAN while the UTRAN does not inform the number of EOFs but only the EOF type is promised to the UE.

The transmission structure of the specific PCPCH of FIG. 41 is the same as that of FIG. The base station analyzes the TFCI transmitted on the DPDCH and determines whether the frame transmitted on the DPDCH is TB '0'. The base station analyzes the TFCI to process the currently transmitted data, that is, to analyze the information (decoding, demultiplexing, etc.) and transmit the received data to the appropriate transmission channel. When the mobile station no longer has data to transmit, the MAC layer transmits TFCI to the physical layer to configure a TB of size '0'. When the physical layer receives such information, the physical layer configures information that the TFCI includes a TB of '0'.

Through this process, the base station recognizes that the TB is '0' based on the information for decoding the received data. Therefore, the base station can effectively release the CPCH channel.

As shown in FIG. 42, the EOF proposed by the present invention is a specific frame having a TB of '0' and is transmitted to a base station for quick release of a CPCH when the mobile station has no data to transmit before NF_max to perform efficient scheduling of a reverse common channel. can do.

41 and 42 described above, it is necessary to add IE of the RRC message as shown in Table 11 below.

Information Element / Group Name Presence Mult IE type and reference Semantics description CPCH set ID M CPCH set ID Indicates the ID number for a particular CPCH set allocated to a cell. [....] [....] [....] [....] [....] Number of EOF M Enumerated (1, 2, 3, 4, 5) Number of frames to indicate end of CPCH transmission [....] [....]

Alternatively, the CPCH channel may be released by inserting a specific pattern known to the base station and the mobile station simultaneously into a specific field of the physical layer. In order to release the CPCH channel, the mobile station must inform the base station of the completion of the frame transmission, so that a specific field of a reverse link or uplink physical layer can be used. Currently, the reverse frame physical layer includes a TPC (power control signal field), a PILOT (pilot bit field), a TFCI (transmission rate information), and an FBI (feedback information field). Each of these fields can be used individually for CPCH channel release. That is, the mobile station transmits one or more release frames by inserting a specific pattern in the TPC, inserting a specific pattern in the pilot, inserting a specific pattern in the TFCI, or inserting the specific pattern in the FBI after CPCH frame transmission is completed.

A case of using the TFCI field as an example of a method of notifying the base station that the mobile station has transmitted the last frame using the specific pattern will be described below. Each physical layer frame consists of 15 slots, and if the length of each TFCI field is N bits, one frame includes 15xN bits of TFCI bits. In this case, the specific pattern means a TFCI pattern having a length of 15 × N. The mobile station divides a specific pattern having a length of 15xN, which is agreed with the base station, into N units, inserts the data into the TFCI field of each slot, and transmits the received information. If it matches the promised pattern, it is determined that CPCH transmission is completed. The above example corresponds to the case where the base station makes a determination on a frame basis, and the unit on which the base station makes the determination may be smaller or larger than one frame length. That is, if the base station determines the M slot (M <15 or M> 15), the length of the promised pattern is NxM bits.

As another example of a method of notifying the base station that the mobile station has transmitted the last frame using the specific pattern, a case of using the PILOT field of the DPCCH will be described. Similar to the TFCI field, the PILOT field also defines pilot pattern N bits defining end-of-frame and indicates end-of-frame by including pilot pattern N bits in 15 slots of each physical layer frame. The pilot pattern is a 15 × N length PILOT pattern. The mobile station divides a specific pattern having a length of 15xN with the base station into N units, inserts the data into the PILOT field of each slot, and transmits the bits. If it matches the pattern, it is determined that CPCH transmission is completed. Like the TFCI, the example corresponds to a case where the base station makes a determination on a frame basis, and the unit on which the base station makes a determination may be smaller or larger than one frame length. That is, if the base station determines the M slot (M <15 or M> 15), the length of the promised pattern is NxM bits.

As another embodiment of the method for notifying the base station that the last frame is transmitted by the mobile station using the specific pattern, the mobile station may give a down command continuously for a predetermined period of time to the value of the power control bit (TPC). If the power control bit is down for a predetermined period, the CPCH resource is recovered. In another embodiment, when using a pilot bit pattern, the pilot bit may be inverted and transmitted to inform the base station.

As described above, the promised pattern may be transmitted in the TFCI field or may be transmitted in other TPC, PILOT, and FBI fields.

The base station recognizes that CPCH transmission is complete when the pattern promised in the field promised with the mobile station is received in one or more frames and releases the CPCH resource. It is also possible to combine one or more fields to make a specific pattern, which the base station and the mobile station must know at the same time. An example of combining a TFCI field and an FBI field by combining one or more fields may be configured as follows. If the physical layer frame consists of 15 slots, and the TFCI field length is NTFCI and the FBI field length is NFBI for each slot, the length of the pattern per frame is (NTFCI + NFBI) xN bits. After transmitting all CPCH frames, the mobile station inserts and transmits the pattern agreed with the base station in the TFCI field and the FBI field in order, and the base station receives the TFCI field and the FBI field for one frame period and determines whether the pattern matches the pattern promised with the mobile station. If there is a match, the CPCH resource is released. In this case, as described in the above example, the length of the pattern may vary according to the unit for which the base station makes a determination. The field combination for transmitting the promised pattern may be any combination of TFCI, PILOT, TPC, and FBI. The number of fields combined to make a specific pattern may be two or more.

FIG. 43 shows a process of releasing CPCH when the effective method of releasing CPCH proposed by the present invention is used and when it is not. As shown in FIG. 43, it can be seen that the case of using the method proposed by the present invention can perform effective scheduling of the reverse common channel by performing fast CPCH cancellation of at least one frame. However, in order to determine whether the frame received by the base station is due to an error or the data transmission is terminated from the mobile station, many frames must be monitored, so the actual release of the CPCH is inevitably delayed.

As described above, the present invention can actively allocate the CPCH required by the subscriber station at the base station, and can save the time required to set up the CPCH. In addition, the number of subscriber devices not only reduces the probability of collision due to the CPCH usage request, but also prevents the waste of radio resources. On the other hand, there is an effect of providing stability in the use of the common packet channel as well as the allocation of a stable common packet channel through the PC_P between the subscriber device and the UTRAN.

In addition, as described above, the present invention can effectively release the CPCH by scheduling the CPCH according to the length of data to be transmitted, thereby providing an efficient use of the CPCH and providing a packet service to more users.

Claims (15)

A row of data frames in a mobile communication system comprising a row of data frames containing data to be transmitted and a row of control frames each control frame having a rate information (TFCI) field representing a length corresponding to the data frame. In the method of the mobile terminal to inform the end of the row of the data frame so that other mobile terminal can transmit data after the termination, Spreading the row of control frames with a first orthogonal code (OVSF) and the row of the data frames with a second orthogonal code (OVSF); Transmitting the spread data in the data frames from the mobile terminal to the base station through a reverse common channel, and transmitting the spread control data in the control frames to the base station through a reverse control channel; Generating a specific control frame indicative of the end of data transmission by configuring a rate information (TFCI) bits for identifying that the length of the data frame is zero, and transmitting the last one of the data frames; And retransmitting the specific control frame to the base station through the reverse control channel. The method of claim 1, And a predetermined number of times is designated by the base station through a broadcasting channel, and the mobile station first transmits the specific control frame by the predetermined number of times. The method of claim 1, The mobile terminal determines the number of retransmissions of the specific control frame in response to a current communication channel situation. Pilot symbol, transmit power control (TPC), and transmit rate information (TFCI) bits for identifying a string of data frames having data to be transmitted through a common packet channel and length information of data included corresponding to each of the data frames. Claims [1] A method of informing a transmission end of data frames to enable a base station to allocate a common packet channel to another mobile terminal in a mobile terminal of a mobile communication system that combines and transmits a sequence of control frames, Monitoring whether all the data to be transmitted are transmitted through the data frames; Constructing a specific control frame having rate information (TFCI) bits indicating that there is no data contained in the data frame by the command indicating end of transmission, and continuing to monitor the end of data transmission; And transmitting the configured specific control frame through the common packet channel. The method of claim 4, wherein And the mobile station transmits the control frame indicating the end of the transmission by a predetermined number of times designated from the base station through a broadcast channel. The method of claim 4, wherein And the mobile station determines the number of transmissions of the control frame indicating the end of the data transmission based on a current communication channel situation. In a code division multiple access mobile communication system, a base station informs a mobile terminal of an end of transmission of data frames so that a base station can allocate a common packet channel to another mobile terminal. Requesting allocation of an assignable common packet channel of the base station; Receiving a channel assignment preamble signature for identifying a common packet channel from the base station by the request; Transmitting, by the mobile terminal, at least one start of a frame to be transmitted to the base station; Sequentially transmitting the data frames through the assigned common packet channel, and sequentially transmitting control frames paired with the data frames through a control channel combined with the common packet channel; Transmitting at least one specific control frame in which a predetermined bit pattern promised with the base station is recorded in a promised field to notify the base station that the data transmission has ended when the data transmission is terminated. Way. The method of claim 7, wherein Wherein the promised field is a Rate Information (TFCI) field of the combined control frame. The method of claim 7, wherein The promised field is a pilot field of the combined control frame. The method of claim 7, wherein The promised field is a feedback information field. The method of claim 7, wherein And said promised field is a power control signal field. The method of claim 7, wherein Wherein the promised field is at least two of a rate information field, a pilot field, a feedback information field, and a power control field. In a code division multiple access mobile communication system, a method for notifying a transmission end of frames by a mobile station to allow a base station to use a physical common packet channel to another mobile terminal, Receiving, by the mobile terminal, a channel state identification channel signal for identifying whether each physical common packet channel can be allocated from the base station; Requesting, by the mobile terminal, the base station for permission to use a physical common packet channel; Receiving, by the mobile terminal, a signal indicating permission to use the physical common packet channel from the base station; Checking whether the permitted physical common packet channel state is changed to a state not being used by the received channel state identification channel signal after performing the requesting process; Determining transmission of the data frames on the licensed physical common packet channel based on the test result; Sequentially transmitting data frames including packet data to be transmitted through the licensed physical common packet channel to the base station when the state of the authorized physical common packet channel is changed to an unused state; And transmitting the end of frame transmission to the base station when the transmission of the packet data to be transmitted by the data frame is completed. In a code division multiple access mobile communication system, a base station notifies the end of transmission of frames by a mobile station so that a base station can allocate a common packet channel to another mobile station, Requesting, by the mobile terminal, an allocation of an assignable common packet channel of the base station; Allocating a common packet channel by the base station in response to the request; The mobile terminal sequentially transmitting data frames through a common packet channel allocated from the base station, and stopping the data frame transmission when the transmission is completed; When the base station does not receive a frame from the mobile station for a predetermined time, releasing the common packet channel, and broadcasting the currently assignable common packet channels including the released common packet channel through a broadcast channel; The mobile station checks whether the currently assignable common packet channels broadcasted from the base station through the broadcast channel include the common packet channel that has stopped transmitting the frame, and the common that has suspended the frame transmission by the checking; And checking whether the packet channel is released. The method of claim 14, Stopping the transmission of the data frames when the mobile station determines that the allocated common packet channel is released by the inspection while sequentially transmitting data frames through the common packet channel allocated from the base station. The method characterized in that.