WO2008018126A1

WO2008018126A1 - Wireless communication system

Info

Publication number: WO2008018126A1
Application number: PCT/JP2006/315729
Authority: WO
Inventors: Koji Sakai; Syuuichi Murata
Original assignee: Fujitsu Limited
Priority date: 2006-08-09
Filing date: 2006-08-09
Publication date: 2008-02-14
Also published as: JPWO2008018126A1; JP4855469B2

Abstract

To provide an enhanced efficiency of wireless transmission and reduce the power consumption of mobile stations. When transmitting, to mobile stations (10-1 to 10-n), control channels for establishing communication services for the mobile stations (10-1 to 10-n), a control information inserting part (21) inserts control information of the same mobile station into all of codes of the same time frames of the n control channels. A spreading part (22) spreads and then multiplexes the n control channels to generate and transmit a single wireless control signal. A despreading part (11) receives and despreads the wireless control signal to generate the n despread data. A decoding part (12) combines the despread data for decoding.

Description

Specification

Wireless communication system

Technical field

[0001] The present invention relates to a wireless communication system, and more particularly to a wireless communication system that performs W-CDMA (Wideband-Code Division Multiple Access) wireless communication.

Background art

In recent years, a wireless communication system called HSDPA (High Speed Downlink Packet Access) based on W-CDMA technology has been developed. HSDPA is a technology that performs high-speed downlink packet transmission at a maximum of 14.4 Mbps (average 2 to 3 Mbps), which is 3 to 4 times faster than the current W-CDM A downlink direction.

FIG. 10 is a diagram showing an outline of HSDP A. Cell phones 111 to 113 and notebook computers 114 and 115 exist in the cell 100a of the base station 100. Here, when packet transmission is performed from the base station 100 in the downlink direction of each terminal, the mobile phone 111 and the notebook computer 114 communicate with each other by the conventional W-CDMA system, and the mobile phones 112, 113 It is assumed that the notebook computer 115 communicates with the HSDPA method.

[0004] In W-CDMA, the transmission rate of packets transmitted from the base station 100 is uniform (up to 384 Kbps) wherever the mobile phone 111 and the notebook computer 114 are located in the cell 100a.

[0005] On the other hand, in HSDPA, the current reception radio wave condition of each terminal is judged, the modulation scheme is switched, and the fastest modulation scheme is selected, so that the base station power can be maintained even within the same cell 100a. The downlink transmission speed at which communication is possible is changed according to conditions such as the distance of the communication.

[0006] For example, if the mobile phone 112 and the laptop computer 115 are located near the base station 100, and there are no obstacles and the reception conditions are good, the mobile phone 112 and the laptop computer 115 receive data at a maximum of 14.4 Mbps. If the mobile phone 113 is at the end of the cell 100a and is away from the base station 100 and the reception conditions are bad, the mobile phone 113 will receive data at a speed lower than 14.4 Mbps.

[0007] Thus, in HSDPA, adaptive modulation and coding processing in which the downlink transmission rate is optimally controlled. Thus, high-speed packet transmission as described above is possible by switching the modulation method according to the reception status on the terminal side. It is also possible to select which user has priority in sending information according to the reception status of radio waves on the terminal side.

[0008] As a procedure for determining the transmission priority for the user (mobile station), first, a pilot signal having a known carrier frequency is transmitted by the base station, and the mobile station existing in the cell receives the pilot signal. .

[0009] The mobile station measures the propagation environment in the current environment when the pilot signal is received, and notifies the base station of the propagation environment index. The base station preferentially transmits traffic data to a mobile station having a good propagation environment.

[0010] The propagation environment indicator is specifically CQI (Channel Quality Indicator), which is a CIR (Carrier-to-Interference Ratio (C / l)) for the pilot signal. Wave ratio) is converted into 30 indices from 1 to 30. For example, CQI = 1 is CI

Represents the lowest value of R and has the worst reception level. CQI = 30 represents the highest value of CIR and has the best reception level.

FIG. 11 is a diagram showing a schematic flow from pilot signal transmission to CQI measurement and data transmission to the mobile station.

[S1] The base station transmits a pilot signal.

[S2] The mobile station receives the pilot signal, obtains CQI, and returns it to the base station. In this case, the mobile station transmits CQI information on a radio channel called HS-DPCCH (High Speed Dedicated Physical Control CHannel) to the base station.

[S3] The base station performs scheduling based on the transmitted CQI. Scheduling is simply a process of selecting a mobile station with a good reception state from a plurality of mobile stations (if the mobile station to be transmitted is determined, the data transmission amount, modulation method, etc. are also determined). Will also be selected).

[S4] The base station transmits control information including various parameters of the scheduling result to the mobile station selected as the communication target. In this case, the base station transmits control information on a control channel called HS-SCCH (High Speed Shared Control CHannel).

[S5] The mobile station sets its own transmission / reception function based on the received control information. [S6] The base station transmits data to the corresponding mobile station using the communication service set by scheduling. This data is sent to the mobile station on a channel carrying user data called HS-PDSCH (High Speed Physical Downlink Shared CHannel).

[0016] Since the mobile station needs to set its own transmission / reception function based on the scheduling result after receiving the control information, the data is received after the mobile station is ready for the data reception state. In the base station, data is transmitted with a certain delay after transmission of control information. That is, a certain time interval (TTI: Transmission Time Intervals) is provided from HS-SCCH transmission to HS-PDSCH transmission as shown in the figure.

[0017] As conventional communication control related to HSDPA, when a mobile station receives HS-PDSCH and transmits an ACKZNACK signal indicating the reception result to the base station, reception processing of packet data corresponding to the ACKZNACK signal is stopped. Thus, a technique for reducing the power consumption of the mobile station has been proposed (for example, Patent Document 1).

Patent Document 1: Japanese Patent Laid-Open No. 2005-64751

Disclosure of the invention

Problems to be solved by the invention

[0018] In HS-SCCH including scheduling results, a maximum of four codes are multiplexed, and multiple codes (one set) are simultaneously transmitted to the mobile station for the base station power. One is detected.

[0019] When the base station power also transmits HS-SCCH to a mobile station, usually, a plurality of HS-SCCH usage numbers and channelization codes for spreading the HS-SCCH are transmitted to the base station. Negotiate between the mobile station and mobile station through the upper layer when a call is connected.

[0020] Based on the result of the negotiation, the base station assigns one user's control information to one code, spreads and multiplexes all the codes, and multiplexes multiple codes in the HS-SCCH set. Generate and transmit one mixed radio control signal.

[0021] In addition, the mobile station receives a radio control signal, performs despreading processing, and performs HS-SCC. Demodulate and decode all codes for one set of H, narrow down the most probable HS-S CCH codes for the local station to one, and control information for HS-PDSCH reception from that HS-SCCH. Perform extraction. If there is no reliable HS-SCCH code in the HS-SCCH set, the HS-SCCH set at that time is judged as “no code for own station”.

FIG. 12 is a diagram showing a conventional HS-SCCH, HS-PDSCH, and HS-DPCCH transmission sequence.

[S11] Base station power HS-SCCH is transmitted in the downlink direction to the mobile station (4-channel transmission in the figure). Note that the first slot of the HS-SCCH includes information for the mobile station to demodulate the HS-PDSCH (code multiplexing number, modulation scheme, etc.) as control information. Also, the second slot of HS-SCCH includes information (process number, retransmission Z new indicator, rate matching information, etc.) for the mobile station to decode HS-PDSCH as control information.

[S12] After transmitting the HS-SCCH from the base station, the HS-PDSCH is transmitted to the mobile station with a delay of 2 slots. In this case, N (maximum 15) specified by HS-SCCH are transmitted.

[S13] The mobile station transmits HS-DPCCH in the uplink direction to the base station. In this case, the HS-DPCCH is transmitted after 7.5 slots have elapsed after the reception of the HS-PDSCH.

[0024] In the first time slot of HS-DPCCH, there is no HS-SCCH addressed to the local station! /, In this case, a D TX message (no transmission) is inserted, and there is an HS-SCCH addressed to the local station. If the CRC (Cyclic Redundancy Check) of the HS-PDSCH data is normal, an ACK message is inserted, and if the CRC is abnormal, a NACK message is inserted.

[0025] Also, CQI is inserted into the second slot of HS-DPCCH. Based on this CQI, the information scheduled at the base station is inserted into the next HS-SCCH.

FIG. 13 is a diagram showing a conventional HS-SCCH transmission format. Depending on the negotiation between the base station and mobile station, HS-SCCH uses four channels # 1 to # 4, and four codes C1-1 to C4—1 are set as one set, and channelization codes CC1 to CC4. Suppose you decide.

[0026] The base station controls one user for any one of the codes C1 1 to C4 1 Insert information, and for other codes, insert control information of another user in the same cell.

4 code is spread and transmitted. As long as they are in the same HS-SCCH set, the control information of each user may be inserted into any of the codes C11 to C4-1.

In the case of the figure, control information of mobile station UE (User Equipment) 1 is inserted into HS-SCCH # 1 code CI—1, and control of mobile station UE2 is inserted into code C2-1 of HS-SCCH # 2. Information is inserted, control information of mobile station UE3 is inserted into code C3—1 of HS-SCCH # 3, control information of mobile station UE4 is inserted into code C4—1 of HS-SCCH # 4, and code C1 is inserted. 1 to C4-1 are HS-SCCH sets.

[0028] Then, the base station uses all channelization codes CC1 to CC4 to spread and transmit the HS-S CCH channel. That is, each of codes 1 1 to 4 1 is multiplied by channelization codes CC1 to CC4 ((CI—1) X (CC1), (C2-1) X (CC2), ·), Multiplex four multiplication results to generate and send one radio control signal.

When the mobile station receives this radio control signal, it despreads the HS-SCCH set using all channelization codes C C1 to CC4. Then, it determines whether there is a code addressed to itself from the obtained multiple despread data, selects the most likely H S-SCCH code, and selects from the selected HS-SCCH code. Extract control information addressed to your station. Thus, in the past, the most probable HS-SC CH code was selected from multiple HS-SCCH codes.

[0030] In such a conventional method, if multiple codes are specified for one set of HS-SCCH and the number of users in the same cell is small (for example, one user), the base station Dummy data was inserted into the HS-SCCH code and transmitted.

FIG. 14 is a diagram showing a transmission format of HS-SCCH including dummy data. In the time slot tl, 4 codes are specified for one set of HS-SCCH, and at this time, if only the mobile station U E1 is to be communicated, the base station, for example, transmits the code of the mobile station UE 1 to the code C11. Control information is inserted, dummy data is inserted into other codes 2-1 to 41, and codes C11 to C4-1 are transmitted as HS-SCCH sets.

[0032] In time slot t2, four codes are specified for one set of HS-SCCH. When only the mobile station UE2 becomes a communication target, for example, the base station inserts the control information of the mobile station UE2 in the code C2-2, and in the other codes C1-2, C3-2, C4-2 Inserts dummy data and transmits codes CI-2 to C4-2 as an HS-SCCH set (same control after times t3).

[0033] In this way, in the situation where three dummy data codes are included in addition to one HS-SCCH code addressed to the own station, the mobile station includes control information addressed to the own station within the same code. In spite of the fact that there is only one, the HS-SCCH for 4 codes is always received, and despreading is performed, and the judgment process addressed to the local station is performed from the dummy data. In addition, there is a problem in that the mobile station generates unnecessary power consumption because it performs unnecessary determination processing.

The present invention has been made in view of these points, and an object of the present invention is to provide a wireless communication system that improves the efficiency of wireless transmission and reduces the power consumption of a mobile station.

Means for solving the problem

In the present invention, in order to solve the above problems, in a wireless communication system that performs wireless communication, a control information insertion unit that inserts control information into a control channel, and the control channel is multiplexed by spreading processing. A base station comprising a radio processing signal to generate and transmit, a despreading processing unit that receives the radio control signal and performs despreading processing to generate despreading data, and A mobile station comprising: a decoding processing unit that synthesizes and decodes the despread data; and the control information insertion unit specifies a specific code for all of the same codes of the plurality of control channels. A wireless communication system is provided, wherein the control information of the mobile station is inserted.

[0036] Here, the control information insertion unit inserts control information into the control channel. The spreading processing unit multiplexes the control channels by spreading processing, and generates and transmits a radio control signal. The despreading processing unit receives the radio control signal and performs despreading processing to generate despread data. The decoding processing unit synthesizes the despread data and decodes it. In addition, the control information insertion unit inserts control information of a specific mobile station into all of the same codes of a plurality of control channels.

The invention's effect [0037] The radio communication system of the present invention inserts control information of a specific mobile station into all the same codes of the control channel, performs control channel spreading processing, generates a radio control signal, and transmits it. The mobile station receives a radio control signal, performs despreading processing, generates despread data, and acquires a control channel. As a result, dummy data is not included in the same code, but only control information addressed to the own station is included, and the mobile station does not need to perform processing for determining whether or not the power is addressed to the own station. It becomes possible to reduce power consumption.

[0038] The above and other objects, features and advantages of the present invention are preferred as examples of the present invention, and will become apparent from the following description in conjunction with the accompanying drawings showing embodiments.

Brief Description of Drawings

FIG. 1 is a principle diagram of a wireless communication system.

FIG. 2 is a diagram showing a transmission format of HS-SCCH.

FIG. 3 is a configuration block diagram of a control channel receiver of a mobile station.

FIG. 4 is a configuration block diagram of a control channel receiving unit.

FIG. 5 is a principle diagram showing a radio communication system according to a second embodiment.

FIG. 6 is a diagram for explaining an insertion pattern of control information.

FIG. 7 is a diagram showing a transmission format of HS-SCCH.

FIG. 8 is a configuration block diagram of a control channel receiver of a mobile station.

FIG. 9 is a principle view showing a wireless communication system according to a third embodiment.

FIG. 10 is a diagram showing an outline of HSDPA.

FIG. 13 is a diagram illustrating a conventional HS-SCCH transmission format.

FIG. 14 is a diagram showing an HS-SCCH transmission format including dummy data.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figure 1 shows a wireless communication system FIG. The wireless communication system 11 according to the first embodiment is a system that includes mobile stations 10-1 to 10-n and a base station 20, and performs wireless communication such as W-CDMA.

The base station 20 includes a control channel transmission unit 2 Oa including a control information insertion unit 21 and a spreading processing unit 22. The control information insertion unit 21 transmits normal control data to the mobile station 10-1 ~: LO-n using the control channel for setting the communication service to the mobile station 10-1 ~: LO-n. In this case, control information of a specific mobile station (same mobile station) is inserted into all of the same codes of n control channels. The spreading processing unit 22 performs spreading processing of n control channels and multiplexes, generates one radio control signal for the n control channels, and transmits it in the air.

[0042] Mobile stations 10-l to 10-n (collectively, mobile station 10) have a control channel receiving unit 10a including a despreading processing unit 11 and a decoding processing unit 12. The despreading processing unit 11 receives the radio control signal and performs despreading processing to generate n despread data. The decryption processing unit 12 combines the despread data and decrypts it.

Next, an operation when the wireless communication system 11 according to the first embodiment is applied to HSDPA will be described. Since the above control channel corresponds to HS-SCCH, it is referred to as HS-SCCH hereinafter.

[0044] FIG. 2 is a diagram showing a transmission format of HS-SCCH. The control information insertion unit 21 of the base station 20 inserts the control information of the same mobile station into a plurality of codes of the same code (the same code means the code of the same time zone) in the HS-SCCH set. .

[0045] For example, the control information of the mobile station 10-1 is inserted into all the codes C1—1 to C4—1 of HS-SCCH # 1 to # 4, and the code Cl—2 of HS-SCCH # 1 to # 4 ~ C4— Insert control information of mobile station 10-2 into all 2. Similarly, control information of the same mobile station is inserted into a plurality of codes having the same code.

Note that the control information insertion unit 21 inserts control information encrypted with the mobile station identifier code corresponding to each of the mobile stations 10-1 to: L0-n. Here, if the identifier codes of the mobile stations 10-1 to 10-n are UE-ID1 to UE-IDn, the control information insertion unit 21 is inserted into the codes C1 1 to C4-1 addressed to the mobile station 10-1. Control information encrypted with UE—ID 1, and control information inserted into codes C12 to C4 2 addressed to mobile station 10—2 is assigned to UE—ID2. (The control information is encrypted and inserted into each code). The same applies thereafter.

[0047] On the other hand, the spreading processing unit 22 in the base station 20 has four HS-SCCHs with control information inserted therein.

For # 1 to # 4, spreading processing is performed using the channelization codes CC1 to CC4 corresponding to HS-SCCH # 1 to # 4, and the spread data is multiplexed to obtain one radio. A control signal is generated and transmitted.

FIG. 3 is a configuration block diagram of the control channel receiving unit 10a of the mobile station 10. The despreading processing unit 11 is composed of despreading units 11a to: L id, and the decoding processing unit 12 includes a combining unit 12a and a decoding unit 12b.

[0049] Despreading section 11a despreads the radio control signal using channelization code CC1. Similarly, the despreading section l ib ~: L id despreads the radio control signal using the channelization codes CC2 to CC4.

[0050] The synthesizer 12a synthesizes the despread data output from the despreader 11a: L id. The decoding key unit 12b decrypts the composite data using the identifier of the local station to cancel the confidentiality, and acquires control information addressed to the local station. For example, in the case of the decoding key unit 12b in the mobile station 10-1, decoding is performed using the UE-ID 1 that is an identifier code.

[0051] As described above, by inserting the control information of the same mobile station in the same code, the mobile station does not need to determine whether it is destined for the mobile station, thereby reducing power consumption. It becomes possible to plan. In addition, since the control information addressed to the local station included in the 4-channel HS-SCCH is synthesized and decoded, the conventional HS-SCCH addressed to the local channel and 3-channel dummy data are multiplexed. Compared with decoding, more reliable HS-SCCH can be detected and error tolerance can be improved.

Next, a modification of the control channel receiving unit 10a of the mobile station 10 will be described. Figure 4 is a block diagram of the configuration of the control channel receiver. The despreading processing unit 11 includes despreading units lla to lId, and the decoding key processing unit 12-1 includes a reliability determination unit 12c, a combining unit 12d, and a decoding key unit 12e.

[0053] The despreading unit 11a despreads the radio control signal using the channelization code CC1. Scatter. Similarly, the despreading section l ib ~: L id despreads the radio control signal using the channelization codes CC2 to CC4.

[0054] The reliability determination unit 12c determines the reliability of the despread data, and extracts and outputs only the despread data with high reliability. The combining unit 12d combines only despread data with high reliability. The decryption key unit 12e decrypts the composite data using the identifier of the local station, and acquires control information addressed to the local station.

Next, a second embodiment of the wireless communication system will be described. FIG. 5 is a principle diagram showing a radio communication system according to the second embodiment. The radio communication system 1-2 includes mobile stations 3 0-1 to 30-n and a base station 40. The base station 40 includes a control channel transmission unit 40a including a control information insertion unit 41 and a spreading processing unit 42.

[0056] The control information insertion unit 41 transmits normal control data to the mobile stations 30-l to 30-n using the control channel for setting the communication service to the mobile stations 30-l to 30-n. In this case, the control information of one mobile station is inserted into one of the same codes of the n control channels. Other codes that do not insert control information are idle (no information is sent). The spreading processing unit 42 performs spreading processing of n control channels, generates n radio control signals for the n control channels, and transmits them in the air.

Mobile stations 30-1 to 30 -n (collectively mobile stations 30) have a control channel receiving unit 30 a including a despreading processing unit 31 and a decoding processing unit 32. The despreading processing unit 31 performs despreading processing only on the radio control signal including the control information addressed to itself and generates despread data. The decryption processing unit 32 decrypts the despread data.

Next, an insertion pattern of control information in the control information insertion unit 41 will be described. FIG. 6 is a diagram for explaining an insertion pattern of control information. The code of the i (1 ≤ i ≤ n) -th control channel in the time slot tk (l ≤ k) is the code Cik, and the control information to be transmitted to the i-th mobile station is the control information Di. At this time, the control information insertion unit 41 inserts the control information Di into the code Cik when i = k.

[0059] For example, if there are n mobile stations, the first mobile station is mobile station 30-1, the second mobile station is mobile station 30-2, and the nth mobile station is mobile station 30-n. The control information insertion unit 41 Control information D1 addressed to mobile station 30-1 is inserted into code CI 1 of time slot tl of control channel # 1, and mobile station 3 0 is supplied to code C22 of time slot t2 of control channel # 2. — Control information D2 addressed to 2 is inserted, and control information Dn addressed to mobile station 30—n is inserted into code Cnk of time slot tk of control channel #n.

[0060] Then, the spreading processing unit 42 performs spreading processing of n control channels # 1 to #n, generates n radio control signals corresponding to each of the n control channels, and enters the air. Send.

On the other hand, the control channel receiver 30a in the i-th mobile station 30-i performs reception processing of only the radio control signal output in the time slot of the time slot tk in which the code Cik exists. For example, the control channel receiver 30a in the mobile station 30-1 receives a radio control signal (control channel # 1) including control information addressed to itself in the time slot tl, and performs despreading and decoding. To obtain control information addressed to the local station. Similarly, the control channel receiver 30a in the mobile station 30-2 receives the radio control signal (control channel # 2) including the control information addressed to itself in the time slot t2, and performs despreading and decoding. To obtain control information addressed to the local station.

It should be noted that the regularity of the control information insertion pattern described above is determined in advance by negotiating at the time of call connection between the base station and the mobile station. Note that the regularity shown in FIG. 6 is an example, and the control information of one mobile station is inserted into one of the same codes of n control channels, and the control information is not inserted. If the code is idle, it may have other regularities.

Next, an operation when the radio communication system 12 of the second embodiment is applied to HSDPA will be described. FIG. 7 shows the HS-SCCH transmission format. The control information insertion unit 41 of the base station 40 inserts the control information of one mobile station into one of the four same codes of HS-SCCH # 1 to # 4 based on the insertion pattern described above in FIG. Other codes that did not insert control information are idle.

[0063] That is, the control information of mobile station 30-1 is inserted into code C11 of HS-SCCH # 1, and the other codes in the same time slot as code C11 are idle, and the code of HS-SCCH # 2 Insert control information for mobile station 30-2 into C22 and add other codes in the same time slot as code C22 Is an idol! ^ -3 "0"[# 3 Code information 33 is entered into mobile station 30-3 control information, other codes in the same time slot as code C33 are idle, and HS-SCCH # 4 code C The control information of mobile station 30-4 is inserted into 44, and the other code in the same time slot as code C44 is idle.

Note that the control information insertion unit 41 inserts control information encrypted with the mobile station identifier code corresponding to each of the mobile stations 30-1 to 30-n. Here, assuming that the identifier codes of the mobile stations 30-1 to 30-n are UE-ID1 to UE-IDn, the control information insertion unit 41 sets the control information inserted in the code C11 addressed to the mobile station 30-1 to the UE. — Encrypt with ID1 and encrypt the control information inserted into code C22 addressed to mobile station 3 0-2 with UE-ID2. The same applies thereafter.

[0065] On the other hand, the spreading processing unit 42 in the base station 40 has four HS-SCCHs with control information inserted therein.

HS-SCCH # 1 is spread with channelization code CC1 for # 1 to # 4, HS-SCCH # 2 is spread with channelization code CC2, and HS-S CCH # 3 is spread with channelization code CC3, and HS-SCCH # 4 is spread with channelization code CC4 to generate and transmit four radio control signals.

FIG. 8 is a configuration block diagram of the control channel receiving unit 30a of the mobile station 30. The despreading processing unit 31 despreads the radio control signal using the channelization code CCx (x = l to 4). In this case, only the radio control signal including the control information addressed to itself is received and despreading processing is performed.

[0067] For example, mobile station 30-1 performs despreading of the HS-SCCH received in time slot tl, and mobile station 30-2 performs despreading of the HS-SCCH received in time slot t2. Decoding processor 32 decodes the despread data using its own station identifier to obtain control information addressed to itself.

[0068] As described above, in the second embodiment, in the base station 40, one user's control information is inserted into one code in the HS-SCCH set, and the mobile station 30 is addressed to the own station. The HS-SCCH is received in the time slot that contains the control information. As a result, the mobile station only needs to receive one channel of HS-SCCH, which can reduce power consumption. become.

Next, a third embodiment of the wireless communication system will be described. The third embodiment is a combination of the first and second embodiments. Based on the CQI value, the operation of the first embodiment and the operation of the second embodiment Is to switch.

FIG. 9 is a principle diagram showing a wireless communication system according to the third embodiment. The wireless communication system 13 includes mobile stations 50-1 to 50-n and a base station 60. The base station 60 includes a pilot signal transmission unit 61, a reception state determination unit 62, and a control channel transmission unit 63.

[0071] Pilot signal transmission unit 61 transmits a pilot signal. The reception status determination unit 62 receives a propagation environment index (CQI), which is an index indicating the radio wave reception environment of the mobile stations 50-1 to 50-n, and determines the mobile station 50-1 to 50 from the magnitude of the CQI value. 50—Judge the reception status of n.

[0072] The control channel transmission unit 63 uses the control channel for setting the communication service to the mobile stations 50-1 to 50-n, and sends normal control data to the mobile stations 50-1 to 50-n. When the reception state is determined to be bad by the reception state determination unit 62 during transmission, a specific mobile station (the same mobile station) is assigned to all the same codes of the n control channels as the first transmission control. Control information is inserted, n control channels are spread and multiplexed, and one first radio control signal is generated and transmitted to the n control channels (that is, the first control signal is transmitted). If the reception state is bad, the base station 60 selects the operation of the first embodiment and uses the control information insertion pattern shown in FIG.

[0073] Further, when the reception state determination unit 62 determines that the reception state is good, the control channel transmission unit 63 sets 1 as one of the same codes of n control channels as the second transmission control. The control information of one mobile station is inserted, and the other codes that do not insert the control information are idle, and the n control channels are spread, and the n second codes for each of the n control channels are performed. Generate and transmit a radio control signal (that is, if the reception state is good), the base station 60 selects the operation of the second embodiment and uses the control information insertion pattern shown in FIG. ).

On the other hand, the mobile station 50 includes a CQI transmission unit 51 and a control channel reception unit 52. The CQI transmission unit 51 receives the pilot signal, measures its own radio wave reception environment, and transmits the CQI corresponding to the measurement result to the base station 60. The control channel receiver 52 receives the first radio control. The control signal or the second radio control signal is received, and despread processing is performed for decoding.

[0075] Thus, in the third embodiment, control is switched according to the propagation environment.

(The first and second transmission controls correspond to the above-described first and second embodiments, respectively, and thus the detailed operation is omitted). In the first transmission control (first embodiment), the same control information is inserted into all the same codes, so the effect is exerted in a situation where the propagation environment is relatively bad, and the second transmission control (second In this embodiment, since one control information is inserted into the same code, it is effective in a situation where the propagation environment is relatively good.If the CQI value is low, the first transmission control and CQI value are If it is higher, switch the control to perform the second transmission control.

[0076] Also, on the mobile station 50 side, whether the first radio control signal based on the first transmission control is transmitted from the base station 60 based on the CQI value measured by itself or the second transmission control is performed. Because it is possible to determine whether the second radio control signal is transmitted based on the CQI value, the reception control setting is switched.

[0077] When the reception state determination unit 62 determines whether the reception state is good or bad from the CQI, the threshold value that has been bullied is compared with the CQI value, If the CQI value is small, it is judged that the reception condition is bad. If the CQI value is larger than the threshold value, it is judged that the reception condition is good. Value will be higher).

[0078] The above merely illustrates the principle of the present invention. In addition, many variations and modifications will be apparent to those skilled in the art, and the invention is not limited to the precise configuration and application shown and described above, but all corresponding variations and equivalents may be It is regarded as the scope of the present invention by the claims and their equivalents.

Explanation of symbols

[0079] 1-1 Wireless communication system

10, 10-l to 10-n mobile station

10a Control channel receiver

11 Despreading processing section

12 Decryption processor base station

Control channel transmitter Control information insertion unit Spreading processing unit

Claims

The scope of the claims

[1] In a wireless communication system that performs wireless communication,

A base station comprising: a control information insertion unit that inserts control information into a control channel; and a spreading processing unit that multiplexes the control channel by spreading processing and generates and transmits a radio control signal;

A mobile station comprising: a despreading processing unit that receives the radio control signal and performs despreading processing to generate despreading data; and a decoding processing unit that synthesizes and decodes the despreading data. When,

Have

The control information insertion unit inserts the control information of the specific mobile station into all of the same code of the plurality of control channels.

A wireless communication system.

[2] The control channel receiving unit performs a process of combining all the received despread data, decodes the combined data, and acquires the control channel addressed to itself. The wireless communication system according to claim 1.

[3] The control channel receiving unit includes a reliability determination unit that determines the reliability of each of the despread data, performs a synthesis process only on the despread data with high reliability, and decodes the data after the synthesis process. 2. The wireless communication system according to claim 1, wherein the control channel addressed to the own station is acquired.

[4] In a base station for wireless communication,

A control information insertion unit for inserting control information into a plurality of control channels;

A spread processing unit that multiplexes the control channel by spreading processing and generates and transmits a radio control signal;

The control information insertion unit, when transmitting the control information to a specific mobile station, inserts the control information for the specific mobile station into all of the same codes of the control channel. .

[5] In a mobile station that performs wireless communication,

A radio control signal spread by the base station is received, despread, and despread A despreading processing unit for generating data,

A decoding processing unit that synthesizes and decodes the despread data,

The despreading processing unit receives the radio control signal generated by spreading the control information for a specific mobile station inserted into all the same codes of the control channel at the base station, and performing the despreading process. To generate the despread data.

[6] In a wireless communication system that performs wireless communication,

A control information insertion unit that inserts control information of a specific mobile station into one of the same codes of the control channel and idles other codes that do not insert the control information, and spread of the control channel A base station including a control channel transmission unit comprising: a spread processing unit that performs processing to generate and transmit a radio control signal for each control channel;

A despreading processing unit that performs despreading processing only on the radio control signal including the control information addressed to the local station to generate despreading data; a decoding processing unit that decodes the despreading data; A mobile station including a control channel receiver with

A wireless communication system comprising:

[7] The code of the control channel i (1≤ i≤ n) of time slot k (1≤ k) is code Cik, and the control information to be transmitted to the mobile station of the second slot is control information Di In this case, the control information insertion unit inserts the control information Di into the code Cik when i = k, and the control channel reception unit in the i-th mobile station receives the time slot in which the code Cik exists. 7. The wireless communication system according to claim 6, wherein reception processing is performed only for the wireless control signal output in a time zone of tk.

[8] In a wireless communication system that performs wireless communication,

A pilot signal transmitting unit that transmits a pilot signal and a propagation environment index transmitted from the mobile station and indicating a radio wave reception environment of the mobile station are received, and the magnitude of the value of the propagation environment index is received. From the reception state determination unit for determining the reception state of the mobile station, and when the reception state is determined to be bad, the control information of the same mobile station is added to all the same codes of the control channel. A first radio control signal is generated and transmitted to the control channel by multiplexing and multiplexing by spreading the control channel If the reception state is determined to be good, the control information of the mobile station is inserted into one of the same codes of the control channel, and the control information is not inserted. The other code is idle, and the control channel is spread. The control channel transmitter performs second transmission control for generating and transmitting a second radio control signal for each control channel. A base station with

Receiving the pilot signal, measuring the radio wave reception environment of the own station, and transmitting the propagation environment index corresponding to the measurement result to the base station; and the first radio control signal Alternatively, a mobile station comprising: a control channel receiving unit that receives the second radio control signal and performs despreading processing to decode it;

A wireless communication system comprising:

[9] When the control channel receiving unit receives the first radio control signal, the control channel receiving unit performs despreading processing to generate despread data, and performs synthesis processing of all the despread data to perform synthesis. 9. The wireless communication system according to claim 8, wherein the processed data is decoded to acquire the control channel addressed to the own station.

[10] When the control channel receiving unit receives the first radio control signal, the control channel receiving unit performs despreading processing to generate despread data, determines reliability of each of the despread data, and determines reliability. 9. The radio communication according to claim 8, wherein only the despread data having a high frequency is subjected to a synthesis process, and the data after the synthesis process is decoded to obtain the control channel addressed to the own station. system.

[11] When the base station determines that the reception state of the mobile station is good, the code of the control channel of the i (1≤i≤n) th time slot tk (1≤k) is code Cik, When the control information to be transmitted to the i-th mobile station is the control information Di, the control channel transmission unit inserts the control information Di into the code Cik when i = k, and the i-th mobile station 9. The control channel receiver in the mobile station receives and processes only the second radio control signal output in a time slot tk in which the code Cik exists. The wireless communication system according to item.