JP5187358B2 - Wireless communication device - Google Patents

Description

  The present invention relates to a wireless communication apparatus in a wireless communication system that transmits and receives data.

  Conventional radio communication apparatuses generally have a configuration having a transmission antenna and a reception antenna or a configuration having a single antenna for both transmission and reception. In addition, a configuration of a wireless communication apparatus to which a space diversity system using a plurality of antennas is applied is also known. There is also known a communication system in which a plurality of antennas are provided in radio communication apparatuses on the transmission side and the reception side, and wireless transmission / reception is performed by space division multiplexing corresponding to the number of antennas. As a MIMO (Multiple Input Multiple Output) system, Are known. This MIMO scheme is a scheme in which a plurality of data streams are spatially multiplexed and transmitted / received between a plurality of transmitting antennas and a plurality of receiving antennas using the independence of radio propagation paths. Methods have been studied (for example, see Patent Document 1, Patent Document 2, or Patent Document 3, or Non-Patent Document 1).

  In addition, in a wireless communication system to which the MIMO system is applied, a system that adaptively controls so that each data stream has an optimum transmission rate has been proposed (for example, see Non-Patent Document 2). There is also known a wireless communication system to which a W-CDMA (Wideband-Code Division Multiple Access) system is applied. This W-CDMA system is a system in which modulation is performed by spreading modulation using different spreading codes corresponding to a plurality of channels, and is applied to radio communication between a mobile radio terminal device such as a cellular phone and a base station. Wireless communication systems have been put into practical use.

  In the W-CDMA system, HSDPA (High Speed Downlink Packet Access) for realizing a transmission rate of a maximum of 14 Mbps in the downlink is defined. This method employs an adaptive coding modulation method for packet transmission. For example, a QPSK (Quadrature Phase Shift Keying) modulation method and a 16-value QAM (Quadrature Amplitude Modulation) method are used in the state of a radio channel. It is switched adaptively so as to achieve a corresponding transmission rate.

  This HSDPA system employs an H-ARQ (Hybrid Automatic Repeat Request) system. For example, when a mobile station in a mobile radio communication system detects an error in received data from a base station, the mobile station communicates with the base station. By making a retransmission request, data is retransmitted from the base station, and the mobile station performs error correction decoding processing using both the received data and the retransmitted data. Applies.

  The main radio channels in the HSDPA system are HS-SCCH (High Speed-Shared Control Channel), HS-PDSCH (High Speed-Physical Channel Linked Channel Channel), and HS-DPCCH (High-Shared Channel Channel). There is.

  The above-mentioned radio channels HS-SCCH and HS-PDSCH are downlink shared channels from the base station to the mobile station in the case of a mobile radio communication system, and HS-SCCH is transmitted by HS-PDSCH. This is a control channel for transmitting various parameters related to data to be transmitted. The various parameters include, for example, modulation type information indicating a modulation scheme for transmitting data by HS-PDSCH, the number of spreading code codes, pattern matching pattern information applied to transmission data, and the like.

  HS-DPCCH is an uplink individual control channel from a mobile station to a base station in the case of a mobile radio communication system, and an ACK signal corresponding to whether normal reception of data received by HS-PDSCH is possible, This is used when a NACK signal is transmitted from the mobile station to the base station. For example, when a CRC error is detected in received data, a NACK signal is transmitted to the base station, and the base station performs retransmission processing based on the NACK signal. The HS-DPCCH measures the reception quality (for example, SIR (Signal to Interference Ratio)) of the received signal from the base station, and periodically transmits the result to the base station as CQI (Channel Quality Indicator). It is used for Based on this CQR, the base station determines whether the downlink radio environment is good or not, and if it is good, switches to a modulation method that allows data to be transmitted at a higher speed. It switches to a modulation method for transmitting data.

  FIG. 15 is an explanatory diagram of the channel configuration in the above-mentioned HSDPA, and shows an overview of CPICH, P-CCPCH, HS-SCCH, HS-PDSCH, HS-DPCCH, and CPICH (Common Pilot Channel) and P -CCPCH (Primary Common Control Physical Channel) is a common channel in the downlink direction, and CPICH is a channel estimation, cell search in the mobile station, and a timing reference for other downlink physical channels in the same cell. It is a channel to be used and a channel for transmitting a so-called pilot signal. P-CCPCH is a channel for transmitting broadcast information. HS-SCCH, HS-PDSCH, and HS-DPCCH indicate the above-described control channels, and the above-described CQI and ACK / NACK are transmitted using the HS-DPCCH.

  Also, one frame (10 ms) is composed of 15 slots, and the CPICH is used as a timing reference. Therefore, the P-CCPCH and HS-SCCH frame heads coincide with the CPICH frame heads, but the HS-PDSCH The frame head is delayed by two slots. This is because the mobile station first receives and identifies information necessary for demodulating the HS-PDSCH. That is, the information such as the modulation method and the spreading code is notified in advance by HS-SCCH, so that HS-PDSCH is demodulated and decoded. HS-SCCH and HS-PDSCH constitute one subframe with three slots.

Information on HS-SCCH is 3GPP TS25.212v. Referring to 5.7.0, the following (a) to (g) are shown.
(A) Xccs (Channelization Code Set Information); 7 bits; information of spreading code used for HS-DSCH.
(B) Xms (Modulation Scheme Information); 1 bit; Modulation method used for HS-DSCH.
(C) Xtbs (Transport-Block Size Information); 6 bits; transmission data block size subjected to error correction coding.
(D) Xhap (Hybrid-ARQ Process Information); 3 bits; process number for performing retransmission control.
(E) Xrv; (Redundancy and Constellation Version); 3 bits; Rate matching parameters.
(F) Xnd; New Data Indicator; 1 bit; Information on whether it is new data.
(G) Xue; UE Identity; 16 bits; user identification information.
As described above, the configuration has a total of 37 bits. By receiving this HS-SCCH, the modulation scheme, spreading code, error correction parameters, etc. used in the HS-DSCH can be known. Therefore, HS-DSCH can be demodulated and decoded according to these parameters.

  The (a) Xccs indicates a spreading code when data is transmitted by HS-PDSCH, and can indicate, for example, a combination of the number of multicodes and a code offset. (B) Xms indicates whether the modulation method is, for example, QPSK or 16-value QAM by “1” and “0”. (C) Xtbs is data for calculating the data size to be transmitted in one subframe of HS-PDSCH. (D) Xhap indicates the process number of H-ARQ. For retransmission, the same number as the process number of the previous transmission data is used.

  (E) Xrv indicates a redundant version parameter and a constellation parameter when HS-PDSCH is retransmitted. The parameter may be updated or not changed during new transmission or retransmission. (F) Xnd is data indicating whether the transmission block of the HS-PDSCH is a new block or a retransmission block. The new block alternately changes “1” and “0”. It is distinguished by not changing it as the same. (G) Xue is identification information of the mobile station (user).

  By receiving the HS-SCCH, the HS-PDSCH can be demodulated and decoded by recognizing the modulation scheme, spreading code, error correction parameters, and the like applied in the HS-PDSCH.

JP 2004-135304 A JP 2003-338777 A JP 2003-332963 A

“Multi-antenna Transceiver Technologies for 3G and Beyond” by Ari Hottinen, Olav Tirkkonen, Risto Wichman 3GPP TS 25.211 v5.5.0 (3rd Generation Partnership Project); Technical Specification Group radio access network; Physical channels and mappings; 3GPP TS 25.213 v5.5.0 (3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Spreading and modulation (FDD)) 3GPP TS 25.214 v 5.7.0 (3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Physical layer procedures (D)

When the above HSDPA scheme is applied to the MIMO scheme, each of the above-mentioned (a) Xccs, (b) Xms, (c) Xtbs, (d) Xha, (e) Xrv, (f) Xnd, (g) Xue FIG. 16 shows the number of bits as the information amount in the case of MIMO non-application, MIMO application N-multiplex 1 packet mode, and MIMO application N-multiplex stream independent mode. Note that N in FIG. 16 represents the MIMO multiplexing number, and [log ₂ (N)] represents the smallest integer equal to or greater than N.
The N-multiplex 1-packet mode is a mode in which one packet is divided and each data obtained by the division is transmitted through each of N paths formed by MIMO multiplexing. The mode is a mode in which separate packets (data) are transmitted for each of N paths formed by MIMO multiplexing.

Therefore, in the N multiplexed stream independent mode with MIMO application, since the transmission format can be set separately for each path, the amount of information increases as the maximum multiplexing number N increases. At this time, if resources (time, frequency, spreading code) are allocated in advance so that the maximum amount of control information described above can be communicated, there is a problem that the resources are reduced and the overall throughput is reduced. On the other hand, when the MIMO multiplexing scheme is applied to increase the number of bits for transmitting control information, a user having a radio propagation environment unsuitable for the MIMO scheme receives control information having a large number of bits. Since it is necessary to identify, there is a problem that causes an increase in the error rate of the control information.
Therefore, one of the objects of the present invention is not limited to adopting the N multiple stream independent mode adopting MIMO, but when transmitting data, it is necessary to transmit information regarding the transmission processing to the receiving device side. To provide a wireless communication apparatus (for example, a wireless base station or a mobile station) that can flexibly cope with an increase in the amount of information related to the transmission processing.

  In addition, increasing the transmission power of the control channel in order to guarantee sufficient quality for all users will result in an increase in interference with other channels, resulting in an increase in the throughput of the wireless communication system. A problem that causes a drop occurs. For the downlink, it is common that not all mobile terminals support the MIMO function in a single mobile phone system. Therefore, there is a mixture of MIMO compatible terminals and non-MIMO compatible terminals. If you want to. In such a wireless communication system, the control channel cannot be transmitted in a fixed manner by applying the MIMO scheme. If you want to increase the amount of control channel information by making the error correction coding rate variable without applying MIMO, changing the transmission rate will cause the traffic channel to increase the transmission rate by MIMO multiplexing. Therefore, there is a problem that it becomes very difficult to control the traffic channel and the control channel so as to obtain the optimum transmission quality under various radio propagation environments.

  The present invention solves the above-described problems, and an object thereof is to flexibly deal with control information for both MIMO application and non-application.

The wireless communication apparatus according to the present invention includes first control information, second control information having a variable transmission rate subjected to a first transmission process according to the first control information, and at least the second control information. A transmission processing unit that transmits data subjected to the second transmission process according to the control information, and the first control information includes information indicating whether MIMO (Multiple Input Multiple Output) is applied, The second control information includes transport block size information, redundant version and constellation information.

  The data is further subjected to transmission processing according to the first control information.

  The first control information includes information indicating whether or not MIMO is applied to the first transmission process.

In addition, the first control information, the second control information having a variable transmission rate subjected to the transmission processing according to the first control information, and the transmission processing according to at least the second control information are performed. and a receiver for receiving the data, Bei example a reception processing unit that acquires the data reception process corresponding to at least the second control information by applying to said data, said first control information , Information indicating whether or not MIMO (Multiple Input Multiple Output) is applied, and the second control information includes transport block size information, redundant version, and information on constellation.

  By transmitting and receiving control information necessary for reception demodulation and decoding of the traffic channel into the first control information and the second control information between the wireless communication devices, the non-MIMO wireless communication device receives the first control information. The data of the traffic channel can be received and demodulated and decoded according to the parameters transmitted by the wireless communication apparatus, and the MIMO-applied radio communication apparatus separates the second control information according to the first control information, and the traffic according to the second control information. The channel data can be demodulated and decoded by performing MIMO demultiplexing, and the physical resources for transmitting the control signal are increased by a plurality of MIMO multiplexing without increasing the physical resources compared to the case without MIMO multiplexing. When sending a packet, when sending a packet with a large block size by MIMO multiplexing Both can be made to correspond. In addition, it is possible to flexibly cope with changes in the number of multiplexed MIMO. Also, the first control information, the second control information having a variable transmission rate subjected to the first transmission processing according to the first control information, and the second transmission according to at least the second control information. Since the processed data is transmitted, even when there is a lot of information related to the data transmission process, it is possible to cope with the transmission of the second control information having a variable transmission rate.

It is principal part explanatory drawing of the Example of this invention. It is principal part explanatory drawing of the transmission / reception means of the Example of this invention. It is explanatory drawing of a traffic channel transmission symbol production | generation means. It is a principal part explanatory drawing of MIMO isolation | separation of a traffic channel. It is principal part explanatory drawing of the transmission means of control information. It is frame structure explanatory drawing. It is explanatory drawing of an operation mode, control information, and a traffic channel. It is explanatory drawing of an operation mode, control information, and a traffic channel. It is principal part explanatory drawing of a CRC addition means. It is principal part explanatory drawing of the transmission / reception means which has an error detection means. It is principal part explanatory drawing of the transmission / reception means which has an error detection means. It is principal part explanatory drawing of the transmission / reception means which has an error detection means. It is assignment explanatory drawing of the time and frequency domain of 1st control information and 2nd control information. It is principal part explanatory drawing which transmits 1st control information with alerting | reporting information. It is channel structure explanatory drawing in HSDPA. It is explanatory drawing of a MIMO multiplexing number and control information amount.

  The wireless communication apparatus of the present invention includes first control information, second control information having a variable transmission rate subjected to a first transmission process according to the first control information, and at least the second control information. A transmission processing unit is provided for transmitting data subjected to the second transmission process according to the control information.

  FIG. 1 is an explanatory diagram of a main part of an embodiment of the present invention, showing a radio communication system including radio communication apparatuses 1a and 1b to which MIMO is applied and a radio communication apparatus 1c to which MIMO is not applied, and the aforementioned HSDPA (High Speed). The Downlink Packet Access) scheme can be applied, and MIMO-applied radio communication apparatuses 1a and 1b are equipped with a plurality of antennas 2a and 2b for transmission / reception or transmission and reception, respectively, and are not applied to MIMO. The device 1c has a single antenna 2c shared for transmission and reception or a transmission antenna and a reception antenna (not shown). Note that a wireless communication apparatus including a plurality of antennas can be switched between MIMO application and non-application. Reference numerals 3a to 3c denote transmission / reception units, and 4a to 4c denote signal processing units, which indicate transmission / reception means of the wireless communication apparatuses 1a, 1b, and 1c.

  In addition, a mobile radio communication system can be configured in which one radio communication apparatus 1a to which MIMO is applied is a base station, the other radio communication apparatus 1b is a mobile station, and a radio communication apparatus 1c to which MIMO is not applied is a mobile station. The wireless communication device 1a as a base station in this case is connected to a network (not shown) and has a configuration capable of wireless communication between the wireless communication devices 1b and 1c with and without MIMO application, Within the service area of the base station, a plurality of mobile stations with and without MIMO can communicate with a fixed terminal device or mobile terminal device connected to the network via the base station.

  The signal processing units 4a and 4b of the MIMO-applied radio communication apparatuses 1a and 1b distribute and process the transmission signals corresponding to the plurality of antennas 2a and 2b and input the signals to the transmission / reception units 3a and 3b, and the plurality of antennas 2a and 2b. It has a MIMO decoding function that restores each received signal to the original signal by the transmission / reception units 3a and 3b compatible with 2b, and includes a traffic channel, a control channel, a pilot channel, etc., and multiplexing according to the transmission method Send and receive. Also, the physical resource allocated to the control channel between the wireless communication devices 1a to 1c is divided into two areas, the control information is classified into two types of first control information C1 and second control information C2, and each of them is a physical resource. Assign to one area and send. For example, it can be assigned to a time axis, a frequency axis, a time / frequency region, a spreading code when CDMA is applied, or a subcarrier when OFDM is applied. In this case, the first control information C1 is not applied with MIMO, and the second control information C2 is applied with MIMO.

  The first control information C1 includes the above-described (g) Xue user identification information (UE identity) and the information part of the second control information C2 indicating whether or not MIMO is applied. The second control information C2 includes traffic information. An information portion that may increase or decrease depending on a channel MIMO mode and a scheme such as retransmission control or adaptive modulation control is included. When the control information is configured in this way and a large amount of control information is required for MIMO multiplexing, the transmission rate is increased by using the second control information C2 as the MIMO multiplexing. Otherwise, the second control information C2 is converted into the MIMO. It is possible to switch the transmission rate so as not to be applied. Such processing can be performed in the signal processing units 4a and 4b. Further, means for adding an error detection code (CRC) to one or both of the first control information C1 and the second control information C2, an error detection unit for detecting an error of the received control signal, and the error detection The signal processing units 4a, 4b, and 4c can be provided with means for returning the detection result of the unit to the wireless communication device on the transmission side. The processing functions of the signal processing units 4a, 4b, and 4c can be realized by an arithmetic processing function such as a DSP (Digital Signal Processor).

  Therefore, the radio communication apparatus 1c not applied with MIMO only needs to receive the first control information C1 for the control information (of course, the second control information C2 is received as MIMO not applied, and the traffic channel data is received). The wireless communication apparatuses 1a and 1b adopting MIMO perform reception processing according to MIMO demultiplexing or the like of the second control information C2 by receiving the first control information C1. be able to. In accordance with the information part for demodulation and decoding based on the second control information C2, data reception processing of the MIMO multiplexed traffic channel is performed. In this way, by dividing the control information into the first control information C1 and the second control information C2, and selecting the information portion to be assigned to each, the frame configuration for applying MIMO and not applying MIMO is made the same. be able to. Accordingly, MIMO multiplexed users can coexist while retaining resource allocation such as frame configuration, frequency, time, and spreading code, and resource use efficiency can be improved. It is also possible to change the MIMO maximum multiplexing number, and it is possible to have high flexibility with respect to an increase in the maximum multiplexing number due to enhancement of the wireless communication system.

  FIG. 2 is a schematic diagram of transmission / reception means corresponding to one antenna i (i = 1 to m) among a plurality of antennas in the transmission / reception units 3a, 3b, 3c and the signal processing units 4a, 4b, 4c of FIG. 11-1, 11-2, and 11-3 are spreading units, 12 is an adding unit, 13 is a radio transmitting unit, and TC (traffic channel) antenna i transmission symbol (TC (i) ), CC (control channel) antenna i transmission symbol (CC (i)), and antenna i pilot symbol (P (i)) are input to spreading sections 11-1, 11-2, and 11-3, respectively. To do. The spreading units 11-1, 11-2, and 11-3 have a configuration that multiplies an input data string by a spreading code that distinguishes a plurality of channels. The spreading code pattern is represented by A (k × Tchip) and an input symbol B. (N × Tsymbol), where the post-spread signal is C (k × Tchip) and Tsymbol = NSF × Tchip, C (k × Tchip) = B (int (k / NSF) × NSF × Tchip) × A (k × Tchip). The adder 12 adds a plurality of spread signals for each chip and inputs the added signals to the wireless transmitter 13. The wireless transmission unit 13 converts the center frequency into a predetermined wireless frequency, performs power amplification and the like, and transmits from the antenna i.

  FIG. 3 is an explanatory diagram of a transmission symbol generation means for a traffic channel (TC), 15 is a CRC adding unit, 16 is an error correction coding unit, 17 is a symbol mapping unit, 18 is a MIMO demultiplexing unit, A transmission symbol corresponding to i (i = 1 to m) is generated, and a part of the configuration of the signal processing units 4a, 4b, and 4c in FIG. 1 is shown. The CRC adding unit 15 (addition processing means of the error detection code CRC) generates a data series D2 in which error detection information (CRC) is added to the transmission data series D1 of the number of data bits (TBS) transmitted in one packet. Since the generation and addition of the CRC have no essential relationship with the present embodiment, a detailed description thereof will be omitted. For example, TS25.212v5.7.0 chapter 4.2.1 “CRC attachment” In addition, the means described for W-CDMA can be applied.

  The error correction coding unit 16 performs error correction coding on the data series D2 to which the error detection information (CRC) is added. Since this error correction coding is not essentially related to the present embodiment, a detailed description thereof is omitted. For example, TS25.212v5.7.0 chapter 4.2.3.1, 4.2. Section 3.2 describes examples of convolutional coding and turbo coding, and it is also possible to apply such error correction coding means.

The symbol mapping unit 17 performs symbol mapping of the data series D3 subjected to error correction coding to QPSK, 16QAM, and the like, and inputs the symbol series D4 to the MIMO separation unit 18. For example, in the case of QPSK, each 2-bit input D3 = (b0, b1) is mapped to one symbol (I, Q). For example, b0 and b1 are signals represented by 0 and 1,
(B0, b1) → (I, Q)
I = 1−2 × b0
Q = 1-2 × b1
As a mapping.

For example, as an example in the case of 16QAM, for 4 bits of D3 = (b0, b1, b2, b3),
(B0, b1, b2, b3) → (I, Q)
I = (1-2 × b0) * (2- (1-2 × b2))
Q = (1-2 × b0) * (2- (1-2 × b2))
A mapping method such as can be applied.

  Further, when MIMO is not applied, the MIMO separation unit 18 sets TC (1) = D4 and does not output TC (2) to TC (Ntxant). That is, a transmission data sequence corresponding to one antenna is used. Also, in the case of MIMO multiplexing, D4-1, D4-2,..., D4-Ntxant are generated by symbol mapping the outputs of a plurality of error correction coding blocks, and i of the data stream to be MIMO multiplexed is generated. TC (i) = D4-i is transmitted using the th (i = 1, 2,..., Ntxant) stream.

  The traffic channel (TC) is capable of applying MIMO modes 1 to 3 (MIMO non-application, MIMO application N multiplexed 1 packet mode, and MIMO application N multiplexed stream independent mode described above), Mode 1 (mode 1) is a mode in which one stream is transmitted with one stream when MIMO non-supporting wireless communication apparatus or MIMO is not applied, and mode 2 (mode 2) is one packet transmission at the time of MIMO multiplexing. In this mode, one packet is transmitted for n streams, and the data amount increases, but the control information amount does not change. In mode 3 (mode 3), independent MIMO modulation and retransmission control are performed during MIMO multiplexing, and an independent packet is transmitted for each of n streams. Since the packets are independent, control information is required individually, and the amount of control information increases.

  FIG. 4 explains encoding and separation by (A) to (C) corresponding to the above-described modes 1 to 3, and a part of the signal processing units 4a, 4b, and 4c of FIG. (A) shows processing in mode 1, and adds error detection information CRC to the data series D1 of the traffic channel (TC) input to the CRC adding unit 15 (see FIG. 3). The data series D2 is input to the symbol mapping section 17 as the data series D3 subjected to error correction encoding by the error correction encoding section 16. In this case, since MIMO is not applied, TC (1) corresponding to the traffic channel (TC) is output, and other TC (2) to TC (Ntxant) are not output.

  FIG. 4B shows processing in mode 2, which is a case where MIMO multiplexing is applied to form one packet. Error detection information CRC is added to the data series D1 and input to the error correction coding unit. Then, error correction coding is performed, the signal is input to the serial / parallel converter, and converted into parallel data corresponding to TC (1) to TC (Ntxant) and output. Further, (C) in FIG. 4 shows processing in mode 3 and is transmitted by an independent packet for each stream. Therefore, addition of error detection information CRC corresponding to the stream and error correction coding are performed. In addition, since the modulation schemes are also different, the symbol mapping units are also performed independently, and TC (1) to TC (Ntxant) are output.

  FIG. 5 shows a main part of the transmission symbol generating means corresponding to the antenna of the control information, showing a part of functional parts of the signal processing units 4a, 4b, 4c of FIG. When the MIMO is applied, the first and second control information C1 and C2 of the control information CC are separated, and the first control information C1 is transmitted to the time multiplexing unit 21 and the second control information C2 is transmitted to the MIMO. The second control information C2 is input to the separation unit 22, and the second control information C2 is separated into C2 (1) to C2 (Ntxant), and C2 (1) among them is input to the time multiplexing unit 21 and the first control information C1. Time multiplexed and CC (1). The other C2 (2) to C2 (Ntxant) are output as CC (2) to CC (Ntxant). CC (1) can also be received by a wireless communication apparatus that does not apply MIMO, so it is desirable to control transmission from a specific antenna, but the specific antenna is not fixed and adaptive. It is also possible to apply control to transmit CC (1) as the first control information by switching to another antenna.

  Further, the MIMO separation unit 22 switches the separation processing according to whether the MIMO multiplexing is performed or not for the second control information C2. In the case of the MIMO multiplexing (MIMO separation ON), the input is input. The second control information C2 is serial / parallel converted into a plurality of signal sequences CC (1) to CC (Ntxant), and the signal sequence CC (1) therein is input to the time multiplexing unit 21. When MIMO multiplexing is not performed (MIMO separation OFF), the input second control information C2 is input to the time multiplexing unit 21 as it is as a signal sequence CC (1).

  FIG. 6 shows control information CC, traffic channel TC data, and pilot channel PC for one frame, and shows a case of time multiplexing. As described above, the control information CC is the first control information as described above. A configuration divided into C1 and second control information C2 is shown.

  7A shows the relationship between the control information classification and the number of assigned bits, and FIG. 7B shows the correspondence between the operation mode, the second control information C2, and the traffic channel TC. In FIG. 7A, the first control information C1, the second control information C2, and the traffic channel TC are shown as channels, and the presence / absence of MIMO multiplexing, the information content, and the above-described mode ( This indicates the number of bits in modes 1 to 3). The first control information C1 has no MIMO multiplexing, and the information content includes user identification information USER-ID and MIMO-mode (M1) of the second control information C2, and the user identification information is in any mode. In this case, for example, 16 bits are set, and the MIMO-mode (M1) of the second control information C2 is set to the number of bits equal to the MIMO multiplexing number N. For example, when the bit i is “1”, the i-th stream is It can be notified that it exists.

  The second control information C2 is subjected to separation processing by the MIMO separation unit 22 shown in FIG. 5 according to the MIMO separation information of the first control information C1, and the information content includes decoding information, demodulation information, and MIMO of the traffic channel TC. -Mode (M2), and the MIMO-mode (M2) of the traffic channel TC has the number of bits equal to the multiplexing number N, similar to the MIMO-mode (M1) of the second control information C2, and The decoded information and the demodulated information are each N times the number of bits in mode3. Further, the traffic channel TC switches the presence / absence of MIMO multiplexing according to the content of the second control information C2. As described above, the control information whose information amount varies depending on the mode is the second control information C2.

  In addition, selection of MIMO application or non-application as a radio communication system has been described, but various systems can be combined as a MIMO multiplexing system. For example, it is possible to apply a transmission diversity mode. In this case, the information on whether or not the transmission diversity mode is applied is included in the MIMO-mode (M1) of the second control information C2 or the MIMO-mode (M2) of the traffic channel TC, so that the first or second control is performed. Notification can be made with the information C1 and C2. The number of bits (M1) and (M2) described above does not change depending on the mode, and can be included in the first control information C1. In this case, since the second control information C2 has an information amount proportional to the MIMO multiplexing number, the first control information C1 having an information amount that does not change depending on the MIMO multiplexing number and the second control information C2 having a changing information amount. The transmission format can be handled efficiently.

  In FIG. 7B, the relationship between the MIMO application (MIMO) and the non-application (normal) of the second control information C2 and the traffic channel TC corresponding to the mode 1, mode 2 and mode 3 of the operation mode is shown. Show. In the case of MIMO application, the amount of control information increases because adaptive modulation is performed independently for each antenna. However, by making the second control information C2 MIMO multiplexed, the entire control information CC is the same as a physical resource. Although an area is allocated, it is also possible to perform control so that the amount of control information is increased only when necessary.

  FIG. 8A shows the relationship between the control information classification and the number of assigned bits, and FIG. 8B shows the correspondence between the operation mode, the second control information C2, and the traffic channel TC. 8A, the MIMO-mode (M2) information of the traffic channel TC included in the second control information C2 of FIG. 7A is used as the MIMO-mode (M1) of C2 and TC. The case where it is included in is shown. If the common MIMO-mode is applied, the information of (M2) is no longer necessary, and the relationship of the control information shown in (A) of FIG. 8 can be obtained.

  8B shows a case where the mode of the second control information C2 and the traffic channel TC are made common. In FIG. 7B, in the case of mode 2, the second control information C2 is , Normal, and traffic channel TC are set to MIMO, but in the case of mode 2 in FIG. 8B, both the second control information C2 and the traffic channel TC are set to MIMO to reduce the amount of control information. Accordingly, the reception process can be simplified.

  FIG. 9 is an explanatory diagram when adding the error detection code CRC to the control information, 31 and 32 are CRC adding units, 33 and 34 are symbol mapping units, and 35 is an area allocation processing unit. This constitutes a part of the functions of the signal processing units 4a, 4b, 4c. (A) in the figure shows that CRC is added to the first control information C1 by the CRC adding unit 31 and is input to the symbol mapping unit 33, and the second control information C2 is directly subjected to symbol mapping. The case where the signal sequence input to the unit 34 and the mapped signal sequence is input to the region allocation processing unit 35 to perform the allocation process on the physical channel region is shown.

  9B, the first control information C1 is directly input to the symbol mapping unit 33, and the CRC is added to the second control information C2 by the CRC adding unit 32, and the symbol mapping unit 34 is added. And the area allocation processing unit 35 performs the allocation process for the physical channel area.

  9C, the CRC adding unit 31 adds a CRC to the first control information C1 and inputs the CRC to the symbol mapping unit 33, and the CRC adding unit 32 adds the CRC to the second control information C2. In addition, a case is shown in which the symbol mapping unit 34 inputs and the region allocation processing unit 35 performs the allocation processing for the physical channel region.

  As described above, when one or both of the first control information C1 and the second control information C2 can be transmitted with a CRC, the first control information C1 is transmitted with a CRC. Then, the first control information C1 is received, error detection by CRC is performed, and ACK and NACK can be returned to the transmitting-side radio communication apparatus according to the detection result. In this case, if NACK is returned, it is a case where normal control information could not be received, so the wireless communication device on the transmission side stops transmission of the next second control information C2 and traffic channel TC, The process can be shifted to the retransmission process of the first control information C1.

  Also, when transmitting with the CRC added to the second control information C2, ACK and NACK can be returned according to the reception check result. As in the case described above, when NACK is returned, normal control information cannot be received, so the transmitting-side radio communication apparatus performs control to stop transmission of the traffic channel TC. Can do. In that case, the process can be shifted to the retransmission process of the second control information C2. Also, when transmitting CRC with the first control information C1 and the second control information C2 added, ACK and NACK can be returned corresponding to the reception check result.

  As for the ACK and NACK described above, for example, an ACK when a CRC is added to either the first or second control information can be returned as “0” and NACK as “1”. When CRC is added to both the first and second control information, ACK1 for the first control information C1 is “00”, NACK1 is “01”, ACK2 for the second control information C2 is “10”, and NACK2 is It can be set to “11”. Also, a channel for transmitting the above-described ACK and NACK from the receiving-side wireless communication apparatus corresponding to (A), (B), and (C) of FIG. 9 can be prepared exclusively. Then, as described above, the wireless communication apparatus that has received ACK and NACK can stop transmission of the traffic channel TC and shift to retransmission processing of the first control information or the second control information.

  FIG. 10 shows a main part of a wireless communication apparatus in a wireless communication system that transmits CRC with the first control information C1, 51 and 52 are antennas, 53 is a wireless receiver, and 54 is wireless. The transmitter, 55 is a TC demodulator, 56 is an error correction decoder, 57 is a C1 demodulator, 58 is a C2 demodulator, and 59 is an error detector. This radio communication apparatus is, for example, in a mobile radio communication system. Mobile station.

  The antennas 51 and 52 are provided in a number corresponding to the MIMO multiplexing number N, and the radio receiving unit 53 includes a MIMO decoding processing unit that performs reception and demodulation and performs separation processing according to the MIMO multiplexing number N, and is already known. Various configurations can be applied. The wireless transmission unit 54 can apply a known configuration in which information is separated into information series corresponding to the antenna, converted into a radio frequency, and transmitted.

  As shown in FIG. 9A, in the wireless communication system in which CRC is added to the first control information C1 and transmitted, the signal is received by the wireless receiver 53 and the first control is performed by the C1 demodulator 57. The information C1 is demodulated and checked by the error detection unit 59. For example, if normal, ACK = "0" is returned, and NACK = "1" is returned when an error is detected. The unit 54 is controlled. The transmitting-side radio communication apparatus such as a base station that has received the ACK shifts to the transmission operation of the next second control information C2 and traffic channel TC, and when the NACK is received, retransmits the first control information C1. Transition to processing. When the second control information C2 next to the first control information C1 is received, it is demodulated by the C2 demodulator 58, and the traffic channel TC is demodulated in the TC demodulator 55 in accordance with the control information of the demodulated content. The correction decoding unit 56 performs error correction decoding processing according to the second control information C2. Note that when the NACK is returned, the second control information C2 is not demodulated, and the processing of the TC demodulator 55 and the error correction decoder 56 is stopped. In this case, in order to reduce power consumption, for example, the operation power supply to the processing functions including the TC demodulation unit 55, the C2 demodulation unit 58, and the error correction decoding unit 56 can be stopped.

  FIG. 11 shows a main part of the radio communication apparatus on the receiving side when transmitting a CRC added to the second control information C2, and the same reference numerals as those in FIG. Although 52 is provided in plural, only one is shown for the sake of simplicity. As shown in FIG. 9B, in the wireless communication system that transmits the second control information C2 with a CRC, reception processing is performed by the wireless reception unit 53, and first control is performed by the C1 demodulation unit 57. The information C1 is demodulated, the second control information C2 is demodulated by the C2 demodulating unit 58, the error detection unit 59 performs error check using the CRC, and the wireless transmission unit corresponding to the result is the same as described above. 54 is returned and ACK or NACK is returned. When ACK is returned due to normal reception, the TC demodulation unit 56 demodulates the traffic channel TC, and the demodulated data is decoded by the error correction decoding unit 56. When NACK is returned due to abnormal reception, the processing of the TC demodulator 55 and the error correction decoder 56 is stopped.

  FIG. 12 shows a main part of the wireless communication device on the receiving side when CRC is added to the first control information C1 and the second control information C2, and the same reference numerals as those in FIGS. 10 and 11 denote the same names. The reference numeral 60 denotes an error detection unit, and 61 denotes an Ack / Nack signal generation unit. The error detection unit 59 performs error detection processing on the demodulation output from the C1 demodulation unit 57 using the CRC added to the first control information C1, and the error detection unit 60 outputs the demodulation output from the C2 demodulation unit 58. The error detection process using the CRC added to the second control information C2 is performed. The Ack / Nack signal generation unit 61 sets, for example, ACK1 for the first control information C1 to “00”, NACK1 to “01”, ACK2 for the second control information C2 to “10”, and NACK2 as described above. The process of “11” can be performed and returned from the wireless transmission unit 54.

  The wireless communication apparatus that has received the returned ACK 1 or 2 or NACK 1 or 2 shifts to transmission control of the second control information C2 by detecting ACK1 reception, for example, and retransmits the first control information C1 by detecting reception of NACK1. It is possible to provide a configuration that shifts to processing, shifts to the transmission operation of the traffic channel TC by detecting reception of ACK2, and shifts to retransmission processing of the second control information C2 by detecting reception of NACK2.

  In a wireless communication system using OFDM (Orthogonal Frequency Division Multiplexing) or multicarrier, for example, as shown in FIG. 13, the horizontal axis is time and the vertical axis is subcarrier, and the first control for one frame. The information C1 and the second control information C2 can be arranged in the time / frequency domain. In the CDMA system, since a plurality of spreading codes can be selected, the CDMA system is applied to the OFDM system, and the physical resources including the frequency, time, and spreading code are set as information on the first control information C1 and the second control information C2. It can also be distributed according to the quantity. It can also be combined with a transmission method such as an OFDM method, a CDMA method, a space diversity method, etc. combined with the MIMO method. An information part indicating the transmission method is included in the first control information C1, and the second control information C2 and traffic are included. Channel reception processing can be enabled.

  Each wireless communication device belonging to the wireless communication system needs to know about application of the MIMO method, but the system configuration can be made variable by notifying all users. In this case, a broadcast channel that can be received by all users can be used. For example, since the first control information C1 described above only needs to be received and identified at the time when data communication is performed on the traffic channel TC, a system configuration in which the first control information C1 is transmitted to the broadcast channel and notified to all users can be achieved. Note that it is possible to apply means for notifying the upper layer control information including the first control information C1 before starting the data communication by the traffic channel TC.

  FIG. 14 shows a main part of the wireless communication apparatus when the first control information C1 is transmitted through the broadcast channel, where 70 is a multiplexing unit, 71 to 74 are spreading units, 75 is an adding unit, and 76 is a wireless transmitting unit. The structure of the principal part corresponding to the antenna 1 in a plurality of antennas is shown. The transmission format information of the first control information C1 and other broadcast information are multiplexed by the multiplexing unit 70 and input to the spreading unit 74, and the antenna 1 transmission symbol (TC (1)) of the traffic channel TC is transmitted to the spreading unit 71. In addition, the antenna 1 transmission symbol (CC (1)) of the control information CC is input to the spreading unit 72 and the antenna 1 pilot symbol (P (1)) is input to the spreading unit 73, respectively, and spread processing is performed using different spreading codes, respectively. The adder 75 adds and synthesizes each chip, and the radio transmitter 76 performs modulation corresponding to the antenna 1 and transmits the result. The broadcast information is transmitted from the base station of the mobile radio communication system, and the mobile station recognizes the transmission format of the first control information C1 based on the received broadcast information, and the second control information C2 and the traffic channel TC. Can be received.

1a, 1b, 1c Wireless communication devices 2a, 2b, 2c Antennas 3a, 3b, 3c Transmission / reception units 4a, 4b, 4c Signal processing units 11-1, 11-2, 11-3 Spreading units 12 Addition units 12 Wireless transmission units 15 CRC addition unit 16 Error correction coding unit 17 Symbol mapping unit 18 MIMO separation unit

Claims (3)

First control information, second control information having a variable transmission rate subjected to the first transmission processing according to the first control information, and at least second control information according to the second control information A transmission processing unit that transmits data subjected to transmission processing ;
The first control information includes information indicating whether or not MIMO (Multiple Input Multiple Output) is applied, and the second control information includes transport block size information, redundant version, and constellation information.
A wireless communication apparatus.   The wireless communication apparatus according to claim 1, wherein the data is further subjected to transmission processing according to the first control information. First control information, second control information having a variable transmission rate subjected to transmission processing according to the first control information, and at least transmission processing corresponding to the second control information A reception unit that receives data, and a reception processing unit that obtains the data by performing reception processing according to at least the second control information on the data,
The first control information includes information indicating whether or not MIMO (Multiple Input Multiple Output) is applied, and the second control information includes transport block size information, redundant version, and constellation information. A wireless communication device.

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