KR100313925B1 - Assignment Method of Common Packet Channel - Google Patents

Abstract

The present invention relates to the next generation mobile communication, and more particularly, to a method for allocating a common packet channel (CPCH) capable of confirming allocation of a common packet channel (CPCH) during transmission of a power control preamble between a base station (BS) and a user side (UE). It is about. The method for allocating a common packet channel (CPCH) according to the present invention includes the steps of requesting allocation of a common packet channel (CPCH) by a plurality of UEs to a base station (BS), and the base station (BS) by one Selecting a user side (UE) and transmitting channel allocation information (CA-AICH) to the selected user side (UE), and whether or not the selected user side (UE) receives the transmitted channel allocation information (CA-AICH) normally Transmitting channel allocation confirmation information for confirmation to the base station (BS), and after the base station (BS) receives the channel allocation confirmation information, the channel allocation confirmation response information which is a response signal to the received channel allocation confirmation information. Transmitting the message through the assigned common packet channel (CPCH) after receiving the channel allocation confirmation response signal by the selected user side (UE); As a result, the user equipment UE correctly receives channel allocation information of the base station BS, thereby smoothly allocating the common packet channel CPCH.

Description

Assignment Method of Common Packet Channel

The present invention relates to the next generation mobile communication, and more particularly, to a method of allocating a common packet channel (CPCH) for confirming allocation of a common packet channel (CPCH) in transmission of a power control preamble between a base station (BS) and a user side (UE). will be.

Recently, the ARIB and TTC in Japan, the ETSI in Europe, the T1 in the US, and the TTA in Korea have recently introduced the Third Generation Partnership Project (hereinafter abbreviated as 3GPP) to establish technical standards for next-generation mobile communication systems. Configured.

In the research section of the 3GPP research on the global radio access network (UTRAN) describes the definition and description of the transport channel (Physical channel) and the physical channel (Physical channel).

The common packet channel (CPCH), which is one of the transmission channels, transmits relatively long data from the user side (UE) to the base station (BS) through the uplink (Up-Link, UL). Assigned between (UE). In this case, the uplink (UL) common packet channel (CPCH) is related to a dedicated channel (DCH), which is a channel for performing Close Loop Power Control, and the dedicated channel (DCH) is a physical channel. It is mapped to a dedicated physical control channel (DPCCH). The common packet channel (CPCH) is allocated with several UEs using a random access scheme.

From now on, a procedure for allocating a common packet channel (CPCH) will be described in detail according to a technology proposed by 3GPP (3GPP TSGR1 # 5 (99) 592 Golden Bridge Technology, 'CPCH Physical Layer Procedures').

FIG. 1 is a diagram illustrating the entire structure of a common packet channel (CPCH) for explaining a conventional process of allocating a common packet channel (CPCH).

Referring to FIG. 1, the process of allocating a common packet channel (CPCH) may be described in four parts.

The first is a power ramping process in which the power of a transmission signal is adjusted to a level that can be received by the base station BS at the UE.

That is, the power ramping process is a process in which a UE transmits an access preamble (hereinafter, abbreviated as AP), and an access preamble acquisition indication channel (Access) which is a response signal to an AP from a base station BS. A Preamble Acquisition Indication Channel (hereinafter abbreviated as AP-AICH) is transmitted. In this case, the AP is composed of one of a signature set or a spreading code set consisting of 16 Hamadad codes, and the AP-AICH corresponds to a code that has a one-to-one correspondence with the AP. It consists of one of a symbol set, a spreading code set, or a channelization code set, which is composed of 16 Hamadad codes.

The power ramping process will be described in more detail. First, the UE selects one of the common packet channels (CPCH), and then selects one code among 16 Hamadad codes and configures the AP symbol. Transmit to base station (BS). In addition, the UE UE repeatedly increases the power of the AP at a predetermined cycle until the AP-AICH, which is a response signal to the AP transmitted from the base station BS, is transmitted.

Then, the base station BS receives each AP transmitted from several UEs, and selects one UE side to which the common packet channel CPCH is to be allocated. The base station BS transmits the AP-AICH composed of a signature corresponding to the AP transmitted from the selected user side UE to the corresponding UE.

Then, each user side (UE) receives the AP-AICH and compares it with the AP transmitted by the user knows that it is selected, the user side (UE) not selected at this time starts the power ramping process from the beginning again.

The second is a collision that may occur when multiple UEs request the same common packet channel (CPCH) allocation at the same time, that is, when multiple UEs simultaneously receive the AP-AICH using the same AP. (Collision) is a process of reducing the UE (Collision Detection Preamble, abbreviated to CD-P) and the base station (BS) is a response signal to the CD-P CD -AICH is transmitted. At this time, the CD-P is composed of one code selected from the symbol group and the other symbol group or spreading code group using the AP, CD-AICH is a symbol group, spreading code group or channelization code group consisting of 16 codes It consists of one code that corresponds one-to-one with the CP-P.

The collision reduction process of the common packet channel (CPCH) will be described in more detail. First, one or more UEs that have received the AP-AICH composed of the same symbols as the APs that they transmit receive 16 different symbols. One symbol is selected from among them, and the CD-P composed of the selected symbol is transmitted to the base station BS.

The base station BS then receives the CD-Ps transmitted from one or more user-sides (UEs) and then transmits the CDs to prevent the same common packet channel (CPCH) being assigned to the multiple user-sides (UEs) accordingly. -Select any one of -P and transmit the CD-AICH composed of symbols that correspond one-to-one with the CD-P to the corresponding UE.

The base station (BS) transmits a channel assignment-AICH (CA-AICH) by including channel assignment information on a common packet channel (CPCH) to be allocated to the corresponding UE (UE) in the form of a signature in the AICH. .

The CD-AICH and the CA-AICH are transmitted from the base station to the corresponding user side (UE). Accordingly, a common packet channel (CPCH) is allocated between the base station BS and the corresponding user side UE.

The third process is to initialize Close Loop Power Control (CL-PC) of the common packet channel (CPCH) allocated to the UE through the Dedicated Physical Control Channel (DPCCH). The base station (BS) consists of a process of transmitting the CL-PC preamble through the uplink and downlink to each other.

Here, as shown in FIG. 2, the CL-PC preamble includes pilot information for estimating a channel state, transmit power information (hereinafter, abbreviated as TPC) information and dummy data for the CL-PC. In the uplink, dummy data is transmitted through a dedicated physical data channel (DPDCH) of I stage, and pilot information and TPC information are transmitted through a dedicated physical control channel (DPCCH) of Q stage. In the downlink, a dedicated physical control channel (DPCCH) and a dedicated physical data channel (DPDCH) are time-divided to transmit pilot information, TPC information, and dummy data.

When the initialization process of the closed loop power control is described in more detail, first, the corresponding UE receives a CD-AICH having the same symbol as the CD transmitted by the BS from the BS to the BS. Send the emblem and the other user side (UE) resumes the initial power ramping process. At this time, the base station (BS) also transmits a PC preamble to the user side (UE) like the user side (UE) to perform the initialization of the closed loop power control.

Fourth, a process of transmitting a message through a common packet channel (CPCH) allocated on the user side (UE). Packet data, a pilot through the assigned common packet channel (CPCH) on the user side (UE). The information and the TPC information are transmitted to the base station (BS), and the base station (BS) transmits pilot information and TPC information for closed loop power control to the user side (UE) through a downlink dedicated physical control channel (DPCCH).

However, in consideration of the conventional process of allocating a common common channel (CPCH), when a plurality of UEs request allocation of the same common packet channel (CPCH), the base station BS collides with the common packet channel (CPCH). By transmitting the channel assignment information CA-AICH to the corresponding user side only once to reduce the number of channels, the UE cannot receive the channel allocation information CA-AICH or receive incorrect channel allocation information. In this case, there is a problem in that the common packet channel (CPCH) cannot be allocated smoothly.

Accordingly, an object of the present invention has been devised in view of the above-mentioned problems of the prior art, and confirms whether or not the channel allocation information (CA-AICH) transmitted from the base station (BS) is normally received at the user side (UE), Accordingly, an object of the present invention is to provide a method for allocating a common packet channel (CPCH) to smoothly allocate a common packet channel (CPCH).

According to an aspect of the present invention for achieving the above object, the method for allocating a common packet channel (CPCH) is a step of a plurality of user-side (UE) to request the allocation of a common packet channel (CPCH) to the base station (BS) And selecting, by the base station BS and transmitting channel allocation information CA-AICH to the selected user side, and transmitting the channel allocation information by the selected user side. Transmitting channel allocation confirmation information for confirming whether the CA-AICH is normally received to the base station BS, and receiving the channel allocation confirmation information after the base station BS receives the channel allocation confirmation information. Transmitting the channel allocation confirmation response information, which is a response signal to the UE, to the selected user side (UE), and after the selected user side (UE) receives the channel allocation confirmation response signal, through the assigned common packet channel (CPCH). It comprises sending a message.

Preferably, the channel allocation confirmation information is a CA code corresponding to the channel allocation information transmitted by the base station BS or an SCD code arbitrarily selected by the UE from a predetermined number of Hadamard codes. The channel allocation confirmation information is included in a power control preamble (PC Preamble) and transmitted to the base station (BS) upon initialization of closed loop power control for the common packet channel (CPCH).

1 is a view showing the overall structure of a common packet channel (CPCH) for explaining the conventional process of allocating a common packet channel (CPCH).

FIG. 2 is a diagram illustrating a structure of a power control preamble shown in FIG. 1.

3 is a flowchart illustrating a method for allocating a common packet channel (CPCH) according to a first embodiment of the present invention.

4 is a flowchart illustrating a method for allocating a common packet channel (CPCH) according to a second embodiment of the present invention.

5 is a flowchart illustrating a process of acknowledging a CA-AICH shown in FIGS. 3 to 4 according to a first embodiment of the present invention.

6 is a diagram showing the overall structure of a common packet channel (CPCH) according to a first embodiment of the present invention.

7 is a flowchart illustrating a process of acknowledging a CA-AICH shown in FIGS. 3 to 4 according to a second embodiment of the present invention.

8 is a diagram showing the overall structure of a common packet channel (CPCH) according to a second embodiment of the present invention.

9 illustrates a CA code and an SCD code according to the present invention.

Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

In the present invention, when the common packet channel (CPCH) is allocated between the base station (BS) and the user side (UE), the UE confirms the normal reception of the channel assignment information (CA-AICH) transmitted from the base station (BS) We propose a method of allocating a common packet channel (CPCH) that allocates a common packet channel (CPCH) accordingly after performing.

To this end, the base station (BS) and the user side (UE) according to the present invention, the channel allocation information (CA-AICH) during the transmission period of the power control preamble (PC Preamble) during initialization of the closed loop power control for the common packet channel (CPCH) ) Additionally performs a channel assignment checking process to confirm normal reception.

In addition, the present invention proposes a method of allocating a common packet channel (CPCH) in which the UE determines the reception power of the common pilot channel (CPICH) and determines whether to perform a channel allocation process accordingly.

First embodiment

In the first embodiment, a method of allocating a common packet channel (CPCH) that always performs a CA-AICH acknowledgment process between a UE and a BS is described.

3 is a flowchart illustrating a method for allocating a common packet channel (CPCH) according to a first embodiment of the present invention.

Referring to FIG. 3, first, a plurality of UEs transmit an access preamble (AP) to a base station (BS) to request allocation of a common packet channel (CPCH) (S300). At this time, the access preamble is one code selected from a symbol set consisting of 16 codes as in the related art.

Then, the base station BS transmits an AP-AICH, which is an acquisition signal for one user side UE, among the plurality of access preambles AP, to the corresponding user side UE (S301).

The UE, which receives the AP-AICH from the base station BS, transmits a Collision Detection Preamble (CD-P) to reduce the collision of the common packet channel (CPCH) (S302).

Then, the BS selects one UE from among UEs transmitting the same CD-P, and transmits the CD-AICH, which is an acquisition signal for the selected CD-P, to the UE. (S303). At this time, the base station (BS) includes the channel assignment information for the common packet channel (CPCH) to be assigned to the CA-AICH and transmits the CD-AICH to the corresponding user side (UE).

Subsequently, the UE and the BS perform an acknowledgment process of the CA-AICH during the transmission interval of the power control preamble when the closed loop power control is initialized (S304).

In operation S304, the UE UE confirms the normal reception of the CA-AICH and transmits a message to the base station BS through the assigned common packet channel CPCH (S305).

Second embodiment

In the second embodiment, a method of allocating a common packet channel (CPCH) for selectively performing a CA-AICH acknowledgment process according to the reception power of the common pilot channel (CPICH) between the UE and the base station BS will be described. .

4 is a flowchart illustrating a method for allocating a common packet channel (CPCH) according to a second embodiment of the present invention.

Referring to FIG. 4, a method of allocating a common packet channel (CPCH) according to the present invention is as follows.

First, a plurality of UEs transmit an access preamble (AP) to a base station (BS) in order to request allocation of a common packet channel (CPCH) (S400). At this time, the access preamble is one code selected from a symbol set consisting of 16 codes as in the related art.

Then, the base station BS transmits an AP-AICH, which is an acquisition signal for one user side UE, among the plurality of access preambles AP, to the corresponding user side UE (S401).

The UE, which receives the AP-AICH from the base station BS, transmits a collision detection preamble (CD-P) to reduce the collision of the common packet channel (CPCH) (S402).

Then, the BS selects one UE from among UEs transmitting the same CD-P, and transmits the CD-AICH, which is an acquisition signal for the selected CD-P, to the UE. (S403). At this time, the base station (BS) includes the channel assignment information for the common packet channel (CPCH) to be assigned to the CA-AICH and transmits the CD-AICH to the corresponding user side (UE).

Then, the corresponding UE (UE) monitors the reception power of the common pilot channel (CPICH) at the time when the CA-AICH is transmitted from the base station (BS) and the threshold of the reception power of the common pilot channel (CPICH) is already set. It is checked whether the value is exceeded (S404, S405). Here, the UE sets a threshold value to a first threshold value and a second threshold value.

Here, since the UE has received the common pilot channel CPICH before transmission of the access preamble AP, the UE receives the common pilot channel CPICH at the time when the CA-AICH is transmitted from the base station BS. Power can be measured.

Subsequently, the UE determines that the CA-AICH is normally received when the reception power of the common pilot channel CPICH exceeds the first threshold according to a result of checking the reception power of the common pilot channel CPICH. Instead of performing the CA-AICH acknowledgment process, a message is transmitted to the base station BS through the assigned common packet channel CPCH (S407), and the reception power of the common pilot channel CPICH is the first threshold. If the value exists between the value and the second threshold, the CA-AICH acknowledgment process is performed (S406). If the received power of the common pilot channel (CPICH) is less than or equal to the second threshold, the CA-AICH is not received. In operation S400, the access preamble AP is transmitted to the base station BS and the allocation of the common packet channel is performed again.

Accordingly, the user UE, which has confirmed normal reception of the CA-AICH from the base station BS according to the steps S400 to S407, controls the closed loop power with the base station BS using the power control preamble. After performing the initialization, a message is transmitted to the base station BS through the assigned common packet channel (CPCH) (S407).

Here, the UE and the BS may perform the acknowledgment process of the CA-AICH in two ways.

Now, the CA-AICH acknowledgment process performed between the user side BS and the base station BS will be described as the third and fourth embodiments.

Third embodiment

5 is a flowchart illustrating an acknowledgment process of the CA-AICH shown in FIGS. 3 to 4 according to a third embodiment of the present invention, and FIG. 6 is a diagram of a common packet channel (CPCH) according to the third embodiment of the present invention. It is a figure which shows the whole structure.

Referring to FIG. 5, first, a UE performs power control free when a base station BS transmits a CA-AICH when a received pilot power of a common pilot channel CPICH exists between a first threshold value and a second threshold value. The CA information is transmitted to the base station BS together with the transmission of the emblem (PC Preamble) (S500). The CA information is composed of one-to-one code corresponding to CA-AICH, which is channel allocation information, and more specifically, is configured as one of a signature set composed of 16 Hadamard codes. The CA information is inserted into the data portion of the uplink-dedicated physical data channel (UL-DPDCH) during the power control preamble section and transmitted to the base station BS through the I channel.

Then, the BS performs channel assignment indicator (CAI) information, which is an acquisition signal for CA information, after a predetermined time has passed, or a TFCI (Transport-format Combination Indicator) field or data of a downlink-dedicated physical control channel (DL DPCCH). It is inserted into the field and transmitted to the corresponding UE (S501). Here, the CAI information is composed of Hadamard codes that correspond one-to-one with CA information.

Then, the UE (UE) that has transmitted CA information checks whether CAI information is transmitted from the base station (BS) (S502), and if the CAI information is transmitted from the base station (BS), a power control preamble (PC Preamble). After the termination of message transmission through the assigned common packet channel (CPCH) (S504). However, when the CAI information is not transmitted from the base station BS or CAI information that does not correspond one-to-one with the CA information transmitted from the base station BS, the common packet channel (CPCH) is released (S503). .

Referring to FIG. 6, the UE performs uplink-dedicated physical data channel (UL-DPDCH) CA information through the I channel at the start of transmission of a power control preamble (Pc Preamble) for acknowledgment of CA-AICH. The base station (BS) transmits the CAI information corresponding to CA information one-to-one to the TFCI field of the downlink-dedicated physical control channel (DL-DPCCH). UE). Therefore, the UE may check whether the CA-AICH is normally received after receiving the CAI information.

Fourth embodiment

7 is a flowchart illustrating an acknowledgment process of CA-AICH shown in FIGS. 3 to 4 according to a fourth embodiment of the present invention, and FIG. 8 is a diagram of a common packet channel (CPCH) according to a fourth embodiment of the present invention. It is a figure which shows the whole structure.

Referring to FIG. 7, first, a UE performs power control free when a reception power of a common pilot channel (CPICH) exists between a first threshold value and a second threshold value at a point in time when a base station (BS) transmits a CA-AICH. The SCD information is transmitted to the base station BS together with the transmission of the PC preamble (S700). The SCD information is composed of one code arbitrarily selected by the corresponding UE from a signature group consisting of 16 Hadamard codes. In addition, the SCD information is inserted into the data portion of the uplink-dedicated physical data channel (UL-DPDCH) during the transmission period of the power control preamble (PC Preamble) and transmitted to the base station (BS) through the I channel.

Then, the base station BS inserts SCDI information, which is an acquisition signal for the SCD information, into a TFCI field or a data field of a DL-dedicated physical control channel (DL DPCCH) and transmits the SCDI information to a corresponding UE (UE). (S701). Here, the SCDI information is composed of codes that correspond one-to-one with the SCD information.

Then, the UE (UE) having transmitted the SCD information checks whether SCDI information is transmitted from the base station (BS) (S702), and if the SCDI information is transmitted from the base station (BS), the power control preamble (PC Preamble) After the end of the message transmission is started through the assigned common packet channel (CPCH) (S704). However, when the user side UE receives no SCDI information from the base station BS or incorrect SCDI information that does not correspond one-to-one with the SCD information transmitted by the base station BS, the common packet channel (CPCH) is released (S703). ).

Referring to FIG. 8, a user equipment (UE) arbitrarily selects an SCD code from a signature group consisting of 16 Hadamard codes at the start of transmission of a power control preamble (Pc Preamble) for acknowledgment of CA-AICH. After selecting one, the selected SCD code is inserted into the data portion of the uplink dedicated physical data channel (UL-DPDCH) and transmitted to the base station (BS) through the I channel. The base station (BS) transmits a downlink-only physical control channel (DL). SCDI information corresponding to SCD information one-to-one in the TFCI field or data field of the DPCCH) is transmitted to the corresponding UE having transmitted the SCD information. Therefore, the user side (UE) can check whether the CA-AICH is normally received by receiving the SCDI.

Meanwhile, as described in the third and fourth embodiments, the CA information, the CAI information, the SCD information, and the SCDI information included in the power control preamble according to the present invention and transmitted according to the present invention are 16-length Hadamard code. It consists of one code selected from the group of 16 signatures, which is shown in FIG.

As described above, since the present invention can confirm whether the channel allocation information (CA-AICH) of the base station (BS) is normally received at the user side (UE), the channel allocation information of the base station (BS) is correctly received at the user side (UE). Therefore, the common packet channel (CPCH) can be smoothly allocated.

In addition, according to the method of allocating a common packet channel (CPCH) according to the present invention by transmitting a SCD code consisting of a Hadama code arbitrarily selected by the user side (UE) during the transmission period of the power control preamble common packet channel (CPCH) It is effective to reduce the collision of (Collision).

Claims (3)

Requesting allocation of a common packet channel (CPCH) to a base station (BS) by a plurality of UEs; The base station (BS) selecting one UE and transmitting channel allocation information (CA-AICH) to the selected UE; Transmitting, by the selected UE, channel allocation confirmation information for confirming whether the transmitted channel allocation information (CA-AICH) is normally received to the base station (BS); Transmitting, by the base station BS, channel assignment confirmation information, which is a response signal to the received channel assignment confirmation information, to the selected user side after receiving the channel assignment confirmation information; And transmitting a message through an assigned common packet channel (CPCH) after the selected user side (UE) receives the channel assignment confirmation response signal. The method of claim 1, wherein the transmitting of the channel assignment confirmation information comprises: The selected user side (UE) measures the reception power of the common pilot channel (CPICH) at the time of transmission of the channel allocation information, and checks whether the received power of the measured common pilot channel (CPICH) exceeds a predetermined threshold value. To do that, And determining, by the selected user side (UE), whether to transmit the channel allocation confirmation information according to the check result. The method of claim 2, wherein in the step of determining whether to transmit the channel allocation confirmation information, The selected user side (UE) does not transmit the channel allocation confirmation information when the measured power of the measured common pilot channel (CPICH) exceeds a first threshold value that is already set, and the measured common pilot channel (CPICH) When the received power of S is present between the already set first threshold value and the second threshold value, the channel allocation confirmation information is transmitted, and the received power of the measured common pilot channel CPICH is less than or equal to the already set second threshold value. And re-assigning the common packet channel (CPCH) to the base station (BS).