Wireless communication apparatus and wireless communication method

The present invention is wireless<u style="single">communication</u>Equipment and radio<u style="single">communication</u>Regarding the method, radio for high-speed packet communication, especially by adaptive modulation and scheduling.<u style="single">communication</u>Equipment and radio<u style="single">communication</u>Regarding the method.

Conventionally, in 3GPP HSDPA (High-Speed Downlink Packet Access), users with relatively good adaptive modulation and propagation path conditions that adaptively control the modulation method according to the propagation path conditions for downlink high-speed packet transmission. Scheduling to transmit signals is used. In multi-carrier transmission such as OFDM and MC-CDMA (see, for example, Non-Patent Document 1), which are being studied as transmission methods for beyond 3G mobile communication systems, high-speed transmission is being realized by using a large number of subcarriers. .. In such a transmission method, it is considered to perform adaptive modulation and scheduling for each subcarrier. In such a system of adaptive modulation and scheduling, the mobile station needs to instantly report the channel quality information (CQI (Channel Quality Indicator)) of each subcarrier to the base station.

The mobile station reports the individual CQI for each subcarrier for all subcarriers to the base station. The base station considers the CQI from each mobile station and determines the subcarrier, modulation method and code rate to be used for each mobile station according to a predetermined scheduling algorithm. Generally, a subcarrier having a relatively good propagation path condition is assigned to each mobile station, and a modulation method and a coding rate that can satisfy a predetermined packet error rate in the propagation path condition are used. When the base station transmits to a plurality of mobile stations at the same time, frequency scheduling is performed using the CQIs of all subcarriers from all users. That is, if there are 64 subcarriers, each mobile station needs to report 64 CQIs. In this case, if CQI is represented by 5 bits, it is necessary to transmit a total of 64 × 5 = 320 bits per user in each wireless frame.

<p><nplcit num="1"><text>Hara, Kawabata, Dan, Sekiguchi, "MC-CDM Method Using Frequency Scheduling", Academic Technical Report RCS2002-129, July 2002, pp.61-pp.66</text></nplcit></p>

<p> However, in the above-mentioned conventional wireless communication device, since the amount of signals for CQI reporting becomes enormous, the interference given to other data channels and cells of the uplink becomes large, and the data capacity that can be transmitted is greatly reduced. There is a problem of doing it. In addition, there is a problem that the power consumption of the mobile station becomes large and the battery life deteriorates due to the huge amount of signals for CQI reporting.</p><p> Therefore, an object of the present invention is to reduce the amount of control signals to be transmitted, thereby increasing the data capacity that can be transmitted, reducing the power consumption, and reducing the interference with other wireless communication devices. Wireless that can increase system capacity<u style="single">communication</u>Equipment and radio<u style="single">communication</u>To provide a method.</p>

<p> According to one embodiment of the present invention, the wireless communication device is measured from a measuring means for measuring the reception quality of a plurality of subcarriers in a communication band from a received signal for each subcarrier and the plurality of subcarriers. It includes a selection means for selecting a subcarrier that satisfies a predetermined condition regarding reception quality, and a reporting means for reporting the result of selection by the selection means.</p><p> According to another embodiment of the present invention, the base station apparatus reports a selection result in which a subcarrier that satisfies a predetermined condition regarding reception quality in a communication partner apparatus is selected from a plurality of subcarriers in the communication band. Modulation means for modulating packet data with a modulation multi-valued number adaptively selected based on the report, coding means for encoding packet data with a coding rate adaptively selected based on the report, and the report. A scheduling means that identifies subcarriers that satisfy the predetermined conditions based on the above, and schedules packet data to be allocated as the number of modulation values or the coding rate increases as the reception quality of the identified subcarriers improves. Equipped with.</p><p> According to still another embodiment of the present invention, the reception quality reporting method includes a measurement step of measuring the reception quality of a plurality of subcarriers in the communication band from the received signal for each subcarrier, and the plurality of subcarriers. , A selection step for selecting a subcarrier that satisfies a predetermined condition regarding the measured reception quality, and a reporting step for reporting the result of selection in the selection step.</p>

<p> According to the present invention, the data capacity that can be transmitted can be increased by reducing the amount of signals to be transmitted, the power consumption can be reduced, and the system capacity can be increased by reducing the interference with other wireless communication devices. Can be increased.</p>

<figref num="1">A block diagram showing a configuration of a wireless communication device according to a first embodiment of the present invention.</figref><figref num="2">The block diagram which shows the structure of the base station apparatus which concerns on Embodiment 1 of this invention.</figref><figref num="3">The figure which shows the arrangement of the subcarrier on the frequency axis which concerns on Embodiment 1 of this invention.</figref><figref num="4">The figure which shows the signal format which concerns on Embodiment 1 of this invention.</figref><figref num="5">The figure which shows the signal format which concerns on Embodiment 1 of this invention.</figref><figref num="6">A block diagram showing a configuration of a wireless communication device according to a second embodiment of the present invention.</figref><figref num="7">A block diagram showing a configuration of a wireless communication device according to a third embodiment of the present invention.</figref><figref num="8">A block diagram showing a configuration of a base station apparatus according to a third embodiment of the present invention.</figref><figref num="9">The figure which shows the signal format which concerns on Embodiment 3 of this invention.</figref><figref num="10">A block diagram showing a configuration of a wireless communication device according to a fourth embodiment of the present invention.</figref><figref num="11">A block diagram showing a configuration of a base station apparatus according to a fourth embodiment of the present invention.</figref><figref num="12">The figure which shows the signal format which concerns on Embodiment 4 of this invention.</figref><figref num="13">The figure which shows the signal format which concerns on Embodiment 4 of this invention.</figref><figref num="14">A block diagram showing a configuration of a wireless communication device according to a fifth embodiment of the present invention.</figref><figref num="15">A block diagram showing a configuration of a base station apparatus according to a fifth embodiment of the present invention.</figref>

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

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a wireless communication device 100 according to a first embodiment of the present invention.

The reception radio processing unit 102 down-converts the reception signal received by the antenna 101 from the radio frequency to the baseband frequency and outputs it to the guard interval (hereinafter referred to as GI) removal unit 103.

The GI removing unit 103 removes the GI from the received signal input from the receiving radio processing unit 102 and outputs the GI to the fast Fourier transform (hereinafter referred to as FFT; Fast Fourier Transform) unit 104.

The FFT unit 104 converts the received signal input from the GI removal unit 103 from the serial data format to the parallel data format, then performs FFT and outputs the FFT to the control information extraction unit 105, the user data extraction unit 108, and the pilot signal extraction unit 112. ..

The control information extraction unit 105 extracts control information including CQI number information transmitted from the base station apparatus from the received signal input from the FFT unit 104 and outputs the control information to the demodulation unit 106.

The demodulation unit 106 demodulates the control information input from the control information extraction unit 105 and outputs it to the decoding unit 107.

The decoding unit 107 decodes the demodulated control information input from the demodulation unit 106 and outputs the control information, and the CQI number information included in the control information is described as a subcarrier selection unit (hereinafter referred to as SC selection unit). ) Output to 127.

The user data extraction unit 108 extracts user data from the received signal input from the FFT unit 104 and outputs the user data to the demodulation unit 109.

The demodulation unit 109 demodulates the user data input from the user data extraction unit 108 and outputs it to the reception HARQ (Hybrid Automatic Repeat Request) unit 110.

If the user data input from the demodulation unit 109 is new data, the receiving HARQ unit 110 saves all or part of the user data and outputs the user data to the decoding unit 111. If the user data input from the demodulation unit 109 is retransmission data, the reception HARQ unit 110 synthesizes the saved user data and the retransmission data and then saves the data, and outputs the synthesized user data to the decoding unit 111. ..

The decoding unit 111 decodes the user data input from the receiving HARQ unit 110 and outputs the user data. Further, the decoding unit 111 performs error detection and decoding and outputs it to the ACK / NACK generation unit 119. CRC (Cyclic Redundancy Check) can be used for error detection. The error detection is not limited to CRC, and any error detection method can be applied.

The pilot signal extraction unit 112 extracts a pilot signal from the reception signal input from the FFT unit 104 and outputs it to the reception quality measurement units 113-1 to 113-n.

The reception quality measurement units 113-1 to 113-n are provided for the number of usable subcarriers, and the reception quality for each subcarrier for all subcarriers is measured using the pilot signal input from the pilot signal extraction unit 112. It measures and outputs the measured value information indicating the reception quality for each measured subcarrier to the CQI generation unit 114 and the SC selection unit 127. As the measured value information, any measured value such as CIR (Carrier to Interference Ratio) or SIR (Signal to Interference Ratio) measured for each subcarrier can be used.

The CQI generation unit 114, which is a reception quality information generation means, inputs from the reception quality measurement unit 113 about the subcarrier of the subcarrier number (hereinafter referred to as SC number) information which is the identification information input from the SC selection unit 127. The measured value information is compared with a plurality of CQI selection thresholds (second thresholds) set according to the reception quality, and CQIs are selected and generated for each subcarrier. That is, the CQI generation unit 114 has a reference table that stores CQI selection information to which different CQIs are assigned for each predetermined area of the measured value indicating the reception quality separated by the threshold values for a plurality of CQI selections. The CQI is selected by referring to the CQI selection information using the measured value information input from the reception quality measurement unit 113. Since the CQI generation unit 114 generates one CQI for one subcarrier, it generates CQIs for the specified number of subcarriers. Then, the CQI generation unit 114 outputs the generated CQI to the coding unit 115. Not limited to the case where the CQI is generated after selecting the subcarriers, the generated CQI may be selected based on the CQI number information after the CQIs for all the subcarriers are generated.

The coding unit 115 encodes the CQIs of the specified number of subcarriers input from the CQI generation unit 114 and outputs them to the modulation unit 116.

The modulation unit 116 modulates the CQI input from the coding unit 115 and outputs it to the multiplexing unit 122.

The coding unit 117 encodes the SC number information input from the SC selection unit 127 and outputs it to the modulation unit 118.

The modulation unit 118 modulates the SC number information input from the coding unit 117 and outputs it to the multiplexing unit 122.

The ACK / NACK generation unit 119 generates an error determination signal NACK signal from the error detection result information input from the decoding unit 111 if retransmission is required, and ACK is an error determination signal if retransmission is not required. A signal is generated, and the generated NACK signal or ACK signal is output to the coding unit 120.

The coding unit 120 encodes the NACK signal or the ACK signal input from the ACK / NACK generation unit 119 and outputs it to the modulation unit 121.

The modulation unit 121 modulates the NACK signal or the ACK signal input from the coding unit 120 and outputs the NACK signal or the ACK signal to the multiplexing unit 122.

The multiplexing unit 122 multiplexes the CQI input from the modulation unit 116, the SC number information input from the modulation unit 118, and the NACK signal or ACK signal input from the modulation unit 121 to generate transmission data, and generates transmission data. Output to serial / parallel (hereinafter referred to as "S / P") converter 123.

The S / P transform unit 123 converts the transmission data input from the multiplex unit 122 from the serial data format to the parallel data format and outputs it to the inverse fast Fourier transform (hereinafter referred to as IFFT; Inverse Fast Fourier Transform) unit 124. To do.

The IFFT unit 124 performs inverse fast Fourier transform on the transmission data input from the S / P conversion unit 123 and outputs it to the GI insertion unit 125.

The GI insertion unit 125 inserts the GI into the transmission data input from the IFFT unit 124 and outputs it to the transmission radio processing unit 126.

The transmission radio processing unit 126 up-converts the transmission data input from the GI insertion unit 125 from the baseband frequency to the radio frequency and transmits the transmission data from the antenna 101.

The SC selection unit 127, which is a selection means, is a sub of the number specified by the CQI quantity information based on the CQI quantity information input from the decoding unit 107 and the measurement value information input from the reception quality measurement units 113-1 to 113-n. Select carriers in order of good reception quality. Then, the SC selection unit 127 outputs the selected subcarrier as SC number information to the CQI generation unit 114 and the coding unit 117. In this way, the SC selection unit 127 selects the number of subcarriers instructed by the control station device. The SC selection unit 127 is not limited to the case where the subcarriers are selected in the order of good reception quality, but sets a predetermined threshold value and CQI is selected from the subcarriers whose reception quality is equal to or higher than the threshold value. Any number of subcarriers specified by the number information may be selected.

Next, the configuration of the base station device, which is the higher-level station device of the wireless communication device 100, will be described with reference to FIG. FIG. 2 is a block diagram showing the configuration of the base station apparatus 200.

The control information extraction unit 205, the demodulation unit 206, the decoding unit 207, the coding unit 209, the transmission HARQ unit 210, the modulation unit 211, the coding unit 212, and the modulation unit 213 form transmission data processing units 221-1 to 221-n. Configure. The transmission data processing units 221-1 to 221-n are provided with the number of users, and each transmission data processing unit 221-1 to 221-n processes transmission data to be transmitted to one user. Further, the coding unit 212 and the modulation unit 213 constitute a control data transmission processing unit 220.

The reception radio processing unit 202 outputs the reception signal received by the antenna 201 to the GI removal unit 203 by down-converting the radio frequency to the baseband frequency.

The GI removing unit 203 removes the GI from the received signal input from the receiving radio processing unit 202 and outputs the GI to the FFT unit 204.

The FFT unit 204 converts the received signal input from the GI removing unit 203 from the serial data format to the parallel data format, separates it into a received signal for each user, and outputs the received signal to each control information extraction unit 205.

The control information extraction unit 205 extracts control information from the received signal input from the FFT unit 204 and outputs it to the demodulation unit 206.

The demodulation unit 206 demodulates the control information input from the control information extraction unit 205 and outputs it to the decoding unit 207.

The decoding unit 207 decodes the received signal input from the demodulation unit 206 and outputs the CQI for each of the specified number of subcarriers included in the received signal to the control unit 208. Further, the decoding unit 207 decodes the received signal input from the demodulation unit 206 and outputs the SC number information included in the received signal to the control unit 208. Further, the decoding unit 207 decodes the received signal input from the demodulation unit 206 and outputs the NACK signal or the ACK signal included in the received signal to the transmission HARQ unit 210.

The control unit 208, which is a scheduling means, performs scheduling based on the scheduling algorithm from the CQI and SC number information of each user's wireless communication device 100 input from the decoding unit 207, and also determines the number of modulation values, the coding rate, and the like. MCS (Modulation Coding) Schemes) are selected adaptively. That is, since the control unit 208 can determine the reception quality for each subcarrier of each wireless communication device 100 from the CQI and SC number information for each subcarrier sent from the wireless communication device 100 of each user. Select the MCS according to the reception quality of each subcarrier of each wireless communication device 100. The control unit 208 grasps the number of usable subcarriers, and allocates transmission data to be transmitted to each wireless communication device 100 within the range of usable subcarriers for each subcarrier. At this time, the control unit 208 assigns the reception quality of the subcarrier to which the CQI has not been sent from the wireless communication device 100 as the worst. Then, the control unit 208 outputs the selected coding rate information for each subcarrier to the coding unit 209, outputs the selected modulation method information for each subcarrier to the modulation unit 211, and schedules each radio. The information of the subcarrier assigned to the communication device 100 is output to the subcarrier allocation unit 215.

The coding unit 209 encodes the input transmission data based on the coding rate information input from the control unit 208 and outputs it to the transmission HARQ unit 210.

The transmission HARQ unit 210 outputs the transmission data input from the coding unit 209 to the modulation unit 211, and temporarily holds the transmission data output to the modulation unit 211. Then, when the NACK signal is input from the decoding unit 207, the transmission HARQ unit 210 is requested to be retransmitted by the wireless communication device 100, so that the temporarily held output transmission data is again modulated by the modulation unit 211. Output to. On the other hand, when the ACK signal is input from the demodulation unit 207, the transmission HARQ unit 210 outputs new transmission data to the modulation unit 211.

The modulation unit 211 modulates the transmission data input from the transmission HARQ unit 210 based on the modulation method information input from the control unit 208 and outputs it to the multiplexing unit 214.

The coding unit 212 encodes control data and CQI number information input from a control station device (not shown), which is a higher-level station device of the base station device 200, and outputs the code to the modulation unit 213. The CQI number information is not limited to the case where it is input from the control station device, and may be set by the base station device 200. In addition, the CQI number information can be set in consideration of the number of users and the amount of traffic. It is also possible to set a value for each mobile station according to the reception capability of the mobile station.

The modulation unit 213 modulates the control data and CQI number information input from the coding unit 212 and outputs them to the multiplexing unit 214.

The multiplexing unit 214 multiplexes the transmission data input from the modulation unit 211, the control data input from the modulation unit 213, and the CQI number information for each data transmitted to the wireless communication device 100 of each user, and is a subcarrier allocation unit. Output to 215. The CQI number information is information unique to each user's wireless communication device 100.

The subcarrier allocating unit 215 rearranges the multiplex signals input from the multiplexing unit 214 based on the subcarrier information of each wireless communication device 100 input from the control unit 208 and outputs them to the S / P conversion unit 216.

The S / P conversion unit 216 converts the transmission data input from the subcarrier allocation unit 215 from the serial data format to the parallel data format and outputs it to the IFFT unit 217.

The IFFT unit 217 IFFTs the transmission data input from the S / P conversion unit 216 and outputs it to the GI insertion unit 218. The transmission data transmitted to each wireless communication device 100 IFFTed by the IFFT unit 127 is assigned to the frequency-scheduled subcarrier in the control unit 208.

The GI insertion unit 218 inserts the GI into the transmission data input from the IFFT unit 217 and outputs it to the transmission radio processing unit 219.

The transmission radio processing unit 219 up-converts the transmission data input from the GI insertion unit 218 from the baseband frequency to the radio frequency and transmits the transmission data from the antenna 201.

Next, the method of selecting the subcarrier in the wireless communication device 100 and the format of the transmission signal when transmitting the CQI of the selected subcarrier will be described with reference to FIGS. 3 to 5.

FIG. 3 shows 64 subcarriers allocated within a predetermined communication bandwidth F1. The base station device 200 transmits high-speed packet data to the wireless communication device 100 of all users using the subcarriers Nos. 1 to 64. From the reception quality measurement results of the reception quality measurement units 113-1 to 113-n, when the reception quality of the 11th to 21st subcarriers and the 34th to 41st subcarriers is good, the SC selection unit 127 sets the SC selection unit 127. Select the 11th to 21st subcarriers and the 34th to 41st subcarriers. Then, the CQI generation unit 114 generates CQI only for the 11th to 21st subcarriers and the 34th to 41st subcarriers, and also generates the 11th to 21st subcarriers and the 34th to 41st subcarriers. Generate SC number information for. On the other hand, the CQI generation unit 114 does not generate CQI and SC number information of subcarriers other than the 11th to 21st subcarriers and the 34th to 41st subcarriers.

FIG. 4 shows the format of the signal transmitted from the wireless communication device 100 to the base station device 200. A pair of 6-bit SC number information and 5-bit CQI constitutes one subcarrier control information. Then, as shown in FIG. 4, the control information output from the multiplexing unit 122 includes a pair of control information of each subcarrier whose CQI is generated by the CQI generation unit 114 and a 1-bit ACK / NACK signal. It is a time-division-multiplexed signal.

FIG. 5 shows another example of the format of the signal transmitted from the wireless communication device 100 to the base station device 200. One subcarrier control information is composed of 1-bit SC number information and 5-bit CQI. As shown in FIG. 5, the control information output from the multiplexing unit 122 is only the SC number information of each of the 64 subcarriers of 64 bits from the beginning and the subcarrier in which the CQI is generated by the CQI generation unit 114. The CQI and 1-bit ACK / NACK signals for are time-division-multiplexed signals. The SC number information is time-division-multiplexed in order from the first subcarrier of 64 subcarriers, and the SC number information of the subcarrier for which CQI is generated is set to "1", and CQI is generated. The SC number information of the subcarriers that have not been set is "0". Therefore, the 1st bit, the 2nd bit to the 10th bit, the 22nd bit to the 33rd bit, and the 42nd bit to the 64th bit are "0", and the 11th bit to the 21st bit and the 34th bit to the 41st bit. It will be "1" up to the eyes.

In the base station apparatus 200 that has received such CQI and SC number information, the control unit 208 preferentially allocates the subcarriers Nos. 11 to 21 and the subcarriers Nos. 34 to 41 to perform each wireless communication. Scheduling can be performed for each subcarrier of the device 100. It is also conceivable to map data that needs to reduce errors (for example, highly important control data or retransmission data) to the subcarriers.

As described above, according to the first embodiment, the number of subcarriers with good reception quality instructed by the base station apparatus is selected, and the CQI of the selected subcarriers is generated and transmitted. By reducing the amount of signals transmitted by, the data capacity that can be transmitted can be increased, the power consumption can be reduced, and the system capacity can be increased by reducing the interference with other wireless communication devices. it can. Further, according to the first embodiment, since only the CQI of the selected subcarrier is generated, the processing time when generating the CQI can be shortened. Further, according to the first embodiment, the instruction for selecting the subcarrier for generating the CQI only needs to transmit the instruction information indicating the number of CQIs from the base station apparatus, so that the instruction is transmitted on the downlink. It is possible to reduce the amount of signals transmitted on the uplink without increasing the amount of signals to be transmitted.

(Embodiment 2) FIG. 6 is a block diagram showing a configuration of the wireless communication device 600 according to the second embodiment of the present invention.

In the wireless communication device 600 according to the second embodiment, the threshold value determination unit 601 is used in the wireless communication device 100 according to the first embodiment shown in FIG. 1, except for the SC selection unit 127, as shown in FIG. to add. In FIG. 6, the same reference numerals are given to the parts having the same configuration as that of FIG. 1, and the description thereof will be omitted. Further, since the configuration of the base station apparatus is the same as that of FIG. 2 except that the CQI threshold information is transmitted instead of the CQI number information, the description thereof will be omitted.

The decoding unit 107 decodes the demodulated control information input from the demodulation unit 106 and outputs the control information, and also outputs the CQI threshold information included in the control information to the threshold value determination unit 601.

The CQI generation unit 114 generates CQI for each subcarrier for all subcarriers from the measured value information input from the reception quality measurement unit 113. That is, the CQI generation unit 114 has a reference table that stores CQI selection information to which different CQIs are assigned for each predetermined area of the measured value indicating the reception quality separated by the threshold values for a plurality of CQI selections. The CQI is selected by referring to the CQI selection information using the measured value information input from the reception quality measurement unit 113. Then, the CQI generation unit 114 outputs the generated CQI to the threshold value determination unit 601. The CQI generation unit 114 is not limited to generating CQIs for all subcarriers, and may generate CQIs after selecting subcarriers by determining the reception quality of each subcarrier as a threshold value. good.

The threshold value determination unit 601 as a selection means uses the CQI input from the CQI generation unit 114 and the CQI threshold information which is the first threshold value input from the decoding unit 107 to determine the reception quality. Only the above CQI is selected, the selected CQI is output to the coding unit 115, and the SC number information of the selected CQI is output to the coding unit 117. Specifically, when using eight levels of CQI from level 1 to 8, when the threshold is set to level 5 or higher, only CQI of level 5 or higher is selected and the threshold is set to level 4 or higher. In that case, select only CQI of level 4 or higher. The threshold value determination unit 601 outputs information of 8 levels indicating which of the 8 levels of levels 1 to 8 the selected CQI is, or, for example, sets the threshold value to level 5 or higher. If this is the case and the generated CQI is level 7, it is possible to adopt a method of outputting relative value information such as outputting 2 which is a relative value with respect to the threshold value. When the method of outputting 8 steps of information is adopted, 3 bits are required to represent 1 to 8 steps, whereas when the method of outputting relative value information is adopted, the threshold is used. If the difference from the value is 0 to 3, the amount of information of 2 bits is sufficient, so that the amount of signal transmission can be reduced when transmitting relative value information. When the method of outputting the relative value information is adopted, the base station apparatus stores the threshold value information common to the wireless communication apparatus 600. Since the method of selecting the CQI in the wireless communication device 600 and the format of the transmission signal when transmitting the selected CQI are the same as those in FIGS. 3 to 5, the description thereof will be omitted.

As described above, according to the second embodiment, the subcarriers satisfying the reception quality equal to or higher than the threshold value instructed by the base station apparatus are selected, and the CQI of the selected subcarriers is generated and transmitted. By reducing the amount of signals transmitted on the uplink, the data capacity that can be transmitted can be increased, the power consumption can be reduced, and the system capacity can be increased by reducing interference with other wireless communication devices. be able to. Further, according to the first embodiment, the instruction for selecting the subcarrier for generating the CQI only needs to transmit the instruction information for instructing the threshold value from the base station apparatus, so that the instruction is transmitted on the downlink. It is possible to reduce the amount of signals transmitted on the uplink without increasing the amount of signals to be transmitted.

(Embodiment 3) FIG. 7 is a block diagram showing a configuration of the wireless communication device 700 according to the third embodiment of the present invention.

The wireless communication device 700 according to the third embodiment has the coding unit 117, the modulation unit 118, and the SC selection unit 127 in the wireless communication device 100 according to the first embodiment shown in FIG. 1, as shown in FIG. Except, the threshold value determination unit 701, the used subcarrier selection unit 702, and the diffusion unit 703 are added. In FIG. 7, the same reference numerals are given to the parts having the same configuration as that of FIG. 1, and the description thereof will be omitted.

The CQI generation unit 114 generates CQI for each subcarrier for all subcarriers from the measured value information input from the reception quality measurement unit 113. That is, the CQI generation unit 114 has a reference table that stores CQI selection information to which different CQIs are assigned for each predetermined area of the measured value indicating the reception quality separated by the threshold values for a plurality of CQI selections. The CQI is selected by referring to the CQI selection information using the measured value information input from the reception quality measurement unit 113. Then, the CQI generation unit 114 outputs the generated CQI to the threshold value determination unit 701. The CQI generation unit 114 is not limited to generating CQIs for all subcarriers, and may generate CQIs after selecting subcarriers by determining the reception quality of each subcarrier as a threshold value. good.

The threshold value determination unit 701, which is a selection means, uses the CQI input from the CQI generation unit 114 and the CQI threshold information input from the decoding unit 107 to select only the CQI whose reception quality is equal to or higher than the threshold value. , The selected CQI is output to the coding unit 115, and the SC number information of the selected CQI is output to the used subcarrier selection unit 702. Similar to the threshold value determination unit 601 in the second embodiment, the threshold value determination unit 701 has eight levels of information indicating which of the eight levels of levels 1 to 8 the selected CQI is. The threshold value can be determined by adopting either a method of outputting the information of the relative value or a method of outputting the information of the relative value.

The used subcarrier selection unit 702 uses a subcarrier whose CQI is generated from the SC number information input from the threshold value determination unit 701 or a subcarrier that is associated with the subcarrier in a one-to-one manner in advance as a transmission subcarrier. Select and output CQI to diffuser 703.

The spreading unit 703 spreads each CQI input from the used subcarrier selection unit 702 using the spreading code for CQI, assigns the CQI signal to the subcarrier assigned by the used subcarrier selection unit 702, and sends the CQI signal to the multiplexing unit 122. Output. The spreading code for CQI is a spreading code different for each user's wireless communication device 700, and the same spreading code is used for all subcarriers and CQI of each user's wireless communication device 700. Since the SC number information is not transmitted, the spreading unit 703 does not spread the SC number information.

The multiplexing unit 122 multiplexes the CQI input from the spreading unit 703 and the NACK signal or ACK signal input from the modulation unit 121, and outputs the NACK signal or the ACK signal to the S / P conversion unit 123. The transmission signal multiplexed by the multiplexing unit 122 is either assigned the CQI of each subcarrier to its own subcarrier, or the CQI of each subcarrier is assigned to the subcarrier having a one-to-one correspondence. Become in a state. The details of the subcarrier allocation method will be described later.

Next, the configuration of the base station apparatus according to the third embodiment will be described with reference to FIG. FIG. 8 is a block diagram showing the configuration of the base station apparatus 800.

The base station apparatus 800 according to the third embodiment adds a reverse diffusion unit 801 and a subcarrier determination unit 802 to the base station apparatus 200 according to the first embodiment shown in FIG. 2, as shown in FIG. In FIG. 8, the same reference numerals are given to the parts having the same configuration as that of FIG. 2, and the description thereof will be omitted.

The control information extraction unit 205, demodulation unit 206, decoding unit 207, coding unit 209, transmission HARQ unit 210, modulation unit 211, coding unit 212, modulation unit 213, reverse diffusion unit 801 and subcarrier determination unit 802 transmit. The data processing units 803-1 to 803-n are configured. The transmission data processing units 803-1 to 803-n are provided with the number of users, and each transmission data processing unit 803-1 to 803-n processes the transmission data to be transmitted to one user.

The despreading unit 801 stores a plurality of spreading codes used in the wireless communication device 700 of one user with which the base station device 800 is communicating. Then, the back-diffusion unit 801 performs back-diffusion processing on all the subcarriers input from the control information extraction unit 205 with the stored diffusion code, and outputs the subcarrier to the subcarrier determination unit 802. Since each wireless communication device 700 uses a different spreading code, the despreading unit 801 of each transmission data processing unit 803-1 to 803-n stores a different spreading code.

The subcarrier determination unit 802 determines that the subcarrier whose reverse diffusion output input from the despreading unit 801 is equal to or higher than the threshold value is the subcarrier selected by the wireless communication device 700, and the subcarrier whose reception quality is equal to or higher than the threshold value. The carrier SC number information is output to the control unit 208 and the demodulation unit 206. Since the SC number information is not transmitted from the wireless communication device 700, the subcarrier determination unit 802 stores the SC number information common to the wireless communication device 700 in advance. In addition, the reception quality is set as a relative value to the reception quality of the pilot signal in consideration of the reception quality fluctuation due to fading.

The decoding unit 207 decodes the received signal input from the demodulation unit 206 and outputs the CQI for each of the specified number of subcarriers included in the received signal to the control unit 208. Further, the decoding unit 207 decodes the received signal input from the demodulation unit 206 and outputs the NACK signal or the ACK signal included in the received signal to the transmission HARQ unit 210.

The control unit 208 uses the CQI of each user's wireless communication device 700 input from the decoding unit 207 and the SC number information of each user's wireless communication device 700 input from the subcarrier determination unit 802 based on the scheduling algorithm. Scheduling is performed, and MCS such as the number of modulation values and the coding rate is adaptively selected. That is, the control unit 208 uses the CQI for each subcarrier sent from the wireless communication device 700 of each user and the SC number information of the wireless communication device 700 of each user input from the subcarrier determination unit 802. Since the reception quality of each subcarrier of each wireless communication device 700 can be determined, the MCS corresponding to the reception quality of each subcarrier of each wireless communication device 700 is selected. Further, the control unit 208 can assign data to be transmitted to the wireless communication device 700 to a subcarrier having good reception quality in each wireless communication device 700. The control unit 208 grasps the number of usable subcarriers, and allocates transmission data to be transmitted to each wireless communication device 700 for each subcarrier within the range of usable subcarriers. At this time, the control unit 208 assigns the reception quality of the subcarrier to which the CQI has not been sent from the wireless communication device 700 as the worst. Then, the control unit 208 outputs the selected coding rate information for each subcarrier to the coding unit 209, outputs the selected modulation method information for each subcarrier to the modulation unit 211, and schedules each radio. The information of the subcarrier assigned to the communication device 700 is output to the subcarrier allocation unit 215.

Next, the method of selecting the CQI in the wireless communication device 700 and assigning it to the subcarrier and the format of the transmission signal when transmitting the selected CQI will be described with reference to FIGS. 3 and 9. There are two methods for allocating subcarriers: one is to assign the CQI of each subcarrier to its own subcarrier, and the other is to assign the CQI of each subcarrier to another subcarrier with a one-to-one correspondence. Is possible.

First, we will explain how to assign the CQI of each subcarrier to its own subcarrier. In FIG. 3, based on the reception quality measurement results of the reception quality measurement units 113-1 to 113-n, when the reception quality of the 11th to 21st subcarriers and the 34th to 41st subcarriers is good, the threshold value is set. The value determination unit 701 selects the CQIs of the 11th to 21st subcarriers and the 34th to 41st subcarriers, and the used subcarrier selection unit 702 selects the 11th to 21st CQIs of the 11th to 21st. The CQI of the 34th to 41st subcarriers is assigned to the 34th to 41st subcarriers while being assigned to the number 34th subcarrier. On the other hand, the threshold value determination unit 701 does not select the CQI and SC number information of the subcarriers other than the 11th to 21st subcarriers and the 34th to 41st subcarriers.

Next, a method of assigning the CQI of each subcarrier to another subcarrier having a one-to-one correspondence will be described. In FIG. 3, based on the reception quality measurement results of the reception quality measurement units 113-1 to 113-n, when the reception quality of the 11th to 21st subcarriers and the 34th to 41st subcarriers is good, the threshold value is set. The value determination unit 701 selects the CQIs of the 11th to 21st subcarriers and the 34th to 41st subcarriers, and the used subcarrier selection unit 702 selects the CQIs of the 11th to 21st one-to-one. Allocate to the corresponding 22nd to 32nd subcarriers, and assign the CQIs of the 34th to 41st subcarriers to the 51st to 57th subcarriers that have a one-to-one correspondence. On the other hand, the threshold value determination unit 701 does not select the CQI and SC number information of the subcarriers other than the 11th to 21st subcarriers and the 34th to 41st subcarriers. The subcarrier that has a one-to-one correspondence with the subcarrier that generated the CQI is stored in advance between the wireless communication device 700 and the base station device 800, so that the base station device 800 receives any CQI. It is possible to recognize whether it is the CQI of the subcarrier.

FIG. 9 shows the format of the signal transmitted from the wireless communication device 700 to the base station device 800. As shown in FIG. 9, the control information composed of each 5-bit CQI for the subcarrier selected by the threshold value determination unit 701 and the ACK signal or NACK signal is time-division-multiplexed. And sent.

As described above, according to the third embodiment, the subcarriers satisfying the reception quality equal to or higher than the threshold value instructed by the base station apparatus are selected, and the CQI of the selected subcarriers is generated and transmitted. By reducing the amount of signals transmitted on the uplink, the data capacity that can be transmitted can be increased, the power consumption can be reduced, and the system capacity can be increased by reducing interference with other wireless communication devices. be able to. Further, according to the third embodiment, since the CQI is assigned to the selected subcarriers having good reception quality, the base station apparatus 800 can acquire the good quality CQI. Further, according to the third embodiment, since the CQI generated for each subcarrier is assigned to its own subcarrier that generated the CQI, the base station apparatus 800 can use any subcarrier without transmitting the SC number information. By being able to determine whether or not the CQI is, the amount of signal transmission can be reduced by the amount that the SC number information is not transmitted. Further, when the duplex method is TDD, since the propagation path characteristics are almost the same in the uplink and downlink, a subcarrier with good reception quality in the downlink can be used in the uplink as well. In other words, the CQI signal can be transmitted using a good propagation path.

Further, according to the third embodiment, the instruction for selecting the subcarrier for generating the CQI only needs to transmit the instruction information for instructing the threshold value from the base station apparatus, so that the instruction is transmitted on the downlink. It is possible to reduce the amount of signals transmitted on the uplink without increasing the amount of signals to be transmitted. Further, according to the third embodiment, since the subcarrier and the CQI are spread processed by using the spreading code unique to each user's wireless communication device 700, the same subcarrier is distributed from the wireless communication device 700 of a plurality of users. When the CQI of is transmitted, the base station device 800 can distinguish which user's wireless communication device 700 is sent from.

(Embodiment 4) FIG. 10 is a block diagram showing a configuration of the wireless communication device 1000 according to the fourth embodiment of the present invention.

The wireless communication device 1000 according to the fourth embodiment includes the CQI generation unit 114, the coding unit 115, and the modulation unit 116 in the wireless communication device 100 according to the first embodiment shown in FIG. 1, as shown in FIG. Excludes. In FIG. 10, the same reference numerals are given to the parts having the same configuration as that of FIG. 1, and the description thereof will be omitted.

The SC selection unit 127 receives the number of subcarriers specified by the CQI quantity information from the CQI quantity information input from the decoding unit 107 and the measurement value information input from the reception quality measurement units 113-1 to 113-n. Select in good order. Then, the SC selection unit 127 outputs the selected subcarrier as SC number information to the coding unit 117.

The multiplexing unit 122 multiplexes the SC number information input from the modulation unit 118 and the NACK signal or ACK signal input from the modulation unit 121 to generate transmission data, and outputs the generated transmission data to the S / P conversion unit 123. ..

Next, the configuration of the base station apparatus 1100 according to the fourth embodiment will be described with reference to FIG. FIG. 11 is a block diagram showing the configuration of the base station apparatus 1100. In FIG. 11, the same reference numerals are given to the parts having the same configuration as that of FIG. 2, and the description thereof will be omitted.

The decoding unit 207 decodes the received signal input from the demodulation unit 206 and outputs the SC number information included in the received signal to the control unit 208. Further, the decoding unit 207 decodes the received signal input from the demodulation unit 206 and outputs the NACK signal or the ACK signal included in the received signal to the transmission HARQ unit 210.

Since the control unit 208 can know the subcarriers having good reception quality in the wireless communication device 1000 of each user from the SC number information of the wireless communication device 1000 of each user input from the decoding unit 207, the reception quality is good. Scheduling is performed based on the scheduling algorithm so that the transmission data is assigned to the subcarriers with the same SC number. That is, since the SC numbers are arranged in the order of good reception quality, the control unit 208 performs scheduling so as to allocate transmission data in order from the beginning of the SC numbers. Then, the control unit 208 outputs the subcarrier information used for transmission to the subcarrier allocation unit 215.

The coding unit 209 encodes the transmission data at a fixed coding rate set in advance and outputs the transmission data to the transmission HARQ unit 210.

The modulation unit 211 modulates the transmission data input from the transmission HARQ unit 210 by a preset fixed modulation method and outputs it to the multiplexing unit 214.

Next, the method of selecting the CQI in the wireless communication device 1000 and the format of the transmission signal when transmitting the selected CQI will be described with reference to FIGS. 3 and 12.

In FIG. 3, when the reception quality of the 11th to 21st subcarriers and the 34th to 41st subcarriers is good from the reception quality measurement results of the reception quality measurement units 113-1 to 113-n, SC is selected. Part 127 outputs SC number information only for the 11th to 21st subcarriers and the 34th to 41st subcarriers. On the other hand, the SC selection unit 127 does not output SC number information of subcarriers other than the 11th to 21st subcarriers and the 34th to 41st subcarriers.

FIG. 12 shows the format of the signal transmitted from the wireless communication device 1000 to the base station device 1100. As shown in FIG. 12, the control information output from the multiplexing unit 122 is time-division multiplexing of the 6-bit SC number information of the subcarrier selected by the SC selection unit 127 and the 1-bit ACK / NACK signal. It is a signal that has been made.

FIG. 13 shows another example of the format of the signal transmitted from the wireless communication device 1000 to the base station device 1100. As shown in FIG. 13, the control information output from the multiplexing unit 122 is a signal in which the SC number information of each of the 64 subcarriers of 64 bits from the beginning and the 1-bit ACK / NACK signal are time-division-multiplexed. .. The SC number information is time-division-multiplexed in order from the first subcarrier of 64 subcarriers, the SC number information of the selected subcarrier is set to "1", and the SC number information of the unselected subcarriers is set to "1". The SC number information is "0". Therefore, the 1st bit, the 2nd bit to the 10th bit, the 22nd bit to the 33rd bit, and the 42nd bit to the 64th bit are "0", and the 11th bit to the 21st bit and the 34th bit to the 41st bit. It will be "1" up to the eyes.

As described above, according to the fourth embodiment, the number of subcarriers with good reception quality instructed by the base station apparatus is selected, and the SC number information of the selected subcarriers is transmitted. Therefore, CQI and SC By reducing the amount of signals transmitted on the uplink compared to the case of transmitting both number information, the data capacity that can be transmitted can be increased, the power consumption can be reduced, and the power consumption can be reduced with respect to other wireless communication devices. System capacity can be increased by reducing interference. Further, according to the fourth embodiment, the instruction for selecting the subcarrier for generating the CQI only needs to transmit the instruction information indicating the number of CQIs from the base station apparatus, so that the instruction is transmitted on the downlink. It is possible to reduce the amount of signals transmitted on the uplink without increasing the amount of signals to be transmitted. Further, according to the fourth embodiment, the base station apparatus may perform coding and modulation methods using a code rate that is fixedly set in advance, so that coding processing, modulation processing, and the like can be performed. Since the processing can be simplified, the circuit and the device can be miniaturized, and the manufacturing cost can be reduced.

(Embodiment 5) FIG. 14 is a block diagram showing a configuration of the wireless communication device 1400 according to the fifth embodiment of the present invention.

The wireless communication device 1400 according to the fifth embodiment is the wireless communication device 100 according to the first embodiment shown in FIG. 1, as shown in FIG. 14, the coding unit 115, the modulation unit 116, and the coding unit 117. Except for the modulation unit 118 and the SC selection unit 127, the threshold value determination unit 1401, the CQI diffusion code generation unit 1402, the used subcarrier selection unit 1403, and the diffusion unit 1404 are added. In FIG. 14, parts having the same configuration as that in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

The threshold value determination unit 1401 which is the selection means uses the CQI which is the selection reception quality information input from the CQI generation unit 114 and the CQI threshold information input from the decoding unit 107 to set the reception quality to the threshold value. Only the above CQI is selected, the selected CQI is output to the CQI diffusion code generation unit 1402, and the SC number information of the selected CQI is output to the use subcarrier selection unit 1403. Similar to the threshold value determination unit 601 in the second embodiment, the threshold value determination unit 1401 has eight levels of information indicating which of the eight levels of levels 1 to 8 the selected CQI is. The threshold value can be determined by adopting either a method of outputting the information of the relative value or a method of outputting the information of the relative value. It should be noted that not only when a CQI equal to or higher than the threshold value is selected from the CQIs of all subcarriers, a subcarrier whose reception quality is higher than the threshold value is selected before the CQI is generated, and the selected subcarrier is selected. It is also possible to generate only the CQI of.

The spread code generation unit 1402 for CQI, which is a spread code selection means, has a reference table for storing the spread code information for CQI, which is the spread code selection information in which the CQI and the spread code are related. Then, the spread code generation unit 1402 for CQI selects the spread code by referring to the spread code information for CQI using the CQI input from the threshold value determination unit 1401, and transfers the selected spread code information to the spread unit 1404. Output. The spread code in the spread code information for CQI is a different code for each user's wireless communication device 1400, and is a different code for each CQI.

The used subcarrier selection unit 1403, which is an allocation means, allocates the ACK signal or NACK signal, which is an error determination signal input from the modulation unit 121, to the subcarrier selected from the SC number information input from the threshold value determination unit 1401. Is output to the diffuser 1404. Here, when a plurality of SC number information is input from the threshold value determination unit 1401, the used subcarrier selection unit 1403 assigns an ACK signal or a NACK signal to the plurality of subcarriers notified by the SC number information.

The spreading unit 1404 diffuses the subcarrier to which the ACK signal or NACK signal input from the used subcarrier selection unit 1403 is assigned by using the spreading code input from the CQI spreading code generation unit 1402, and multiplexes the unit. Output to 122.

Next, the configuration of the base station apparatus according to the fifth embodiment will be described with reference to FIG. FIG. 15 is a block diagram showing the configuration of the base station apparatus 1500.

The base station apparatus 1500 according to the fifth embodiment adds a reverse diffusion unit 1501 and a determination unit 1502 to the base station apparatus 200 according to the first embodiment shown in FIG. 2, as shown in FIG. In FIG. 15, the same reference numerals are given to the parts having the same configuration as that of FIG. 2, and the description thereof will be omitted.

The control information extraction unit 205, demodulation unit 206, decoding unit 207, coding unit 209, transmission HARQ unit 210, modulation unit 211, coding unit 212, modulation unit 213, reverse diffusion unit 1501 and determination unit 1502 process transmission data. Consists of parts 1503-1 to 1503-n. The transmission data processing units 1503-1 to 1503-n are provided with the number of users, and each transmission data processing unit 1503-1 to 1503-n processes the transmission data to be transmitted to one user.

The despreading unit 1501 stores a plurality of spreading codes used in the wireless communication device 1400 of one user with which the base station device 1500 is communicating. Then, the reverse diffusion unit 1501 performs reverse diffusion processing with the stored diffusion code for all the subcarriers input from the control information extraction unit 205, and outputs the data to the determination unit 1502. Since each wireless communication device 1400 uses a different spreading code, the despreading unit 1501 of each transmission data processing unit 1503-1 to 1503-n stores a different spreading code.

The determination unit 1502 has a reference table for storing the spread code information for CQI in which the spread code and the CQI are related, and also stores all the spread codes used by the wireless communication device 1400 of one user. ing. Since each wireless communication device 1400 uses a different diffusion code, the determination units 1502 of each transmission data processing unit 1503-1 to 1503-n store different diffusion codes. This spread code information for CQI is common to the spread code generator 1402 for CQI. The determination unit 1502 obtains the despread output of the received signal input from the despread unit 1501 for each subcarrier, and compares the largest despread output for each subcarrier with the threshold value (third threshold value). Then, the determination unit 1502 determines that the subcarrier whose largest despread output is equal to or greater than the threshold value is the subcarrier selected by the wireless communication device 1400, and determines that the subcarrier has the largest despread output. By referring to the spread code information for CQI using the spread code used, the CQI of the subcarrier whose largest back spread output is equal to or larger than the threshold value is selected, and the selected CQI is output to the control unit 208. At this time, the despreading output is represented by a value relative to the received power of the pilot in consideration of the fluctuation of the received power due to fading.

The demodulation unit 206 demodulates the ACK signal or NACK signal input from the determination unit 1502 and outputs it to the decoding unit 207.

The decoding unit 207 decodes the demodulation result of the ACK signal or the NACK signal input from the demodulation unit 206 and outputs it to the transmission HARQ unit 210.

The control unit 208 performs scheduling based on the scheduling algorithm from the CQI of the wireless communication device 1400 of each user input from the determination unit 1502, and adaptively selects the MCS such as the number of modulation values and the coding rate. That is, since the control unit 208 can determine the reception quality for each subcarrier for each wireless communication device 1400 from the CQI for each subcarrier input from the determination unit 1502, each sub for each wireless communication device 1400. Select the MCS according to the reception quality of the carrier. The control unit 208 grasps the number of usable subcarriers, and allocates transmission data to be transmitted to each wireless communication device 1400 within the range of usable subcarriers for each subcarrier. At this time, the control unit 208 assigns the reception quality for the subcarriers that the CQI does not input from the determination unit 1502 as the worst. Then, the control unit 208 outputs the selected coding rate information for each subcarrier to the coding unit 209, outputs the selected modulation method information for each subcarrier to the modulation unit 211, and schedules each radio. The information of the subcarrier assigned to the communication device 1400 is output to the subcarrier allocation unit 215.

Next, a method of selecting a subcarrier in the wireless communication device 1400 will be described with reference to FIG.

The used subcarrier selection unit 1403 assigns an ACK signal or an NACK signal to the 11th to 21st subcarriers and the 34th to 41st subcarriers. The control information multiplexed by the multiplexing unit 122 is a signal in which a plurality of ACK signals or NACK signals are time-divided and multiplexed. By the way, in the case of FIG. 3, a plurality of ACK signals or NACK signals are transmitted, but since the CQI requires 5 bits and the ACK signal or NACK signal is 1 bit, the whole is The amount of signal can be reduced.

As described above, according to the fifth embodiment, the subcarriers having good reception quality are selected and transmitted by assigning the ACK signal or the NACK signal to the selected subcarriers, so that the signal to be transmitted on the uplink is transmitted. By reducing the amount, the data capacity that can be transmitted can be increased, the power consumption can be reduced, and the system capacity can be increased by reducing the interference with other wireless communication devices. Further, according to the fifth embodiment, the ACK signal or NACK signal as to whether or not to request retransmission can be used in combination with the reception quality information corresponding to CQI, and the CQI and SC number information are not transmitted. , The amount of signals transmitted on the uplink can be reduced to the utmost limit. Further, according to the fifth embodiment, the instruction for selecting the subcarrier for generating the CQI only needs to transmit the instruction information indicating the number of CQIs from the base station apparatus, so that the instruction is transmitted on the downlink. It is possible to reduce the amount of signals transmitted on the uplink without increasing the amount of signals to be transmitted.

In the fifth embodiment, the wireless communication device 1400 selects a user-specific spreading code to spread the subcarrier to which the ACK signal or the NACK signal is assigned, but the present invention is not limited to this, and the user-specific spreading code is used. The scrambling code may be selected and the subcarrier to which the ACK signal or the NACK signal is assigned may be scrambled using the selected scrambling code.

In the above-described first to fifth embodiments, 64 subcarriers are assigned to F1 in the communication band, but the present invention is not limited to this, and any number of subcarriers other than 64 can be assigned. is there. Further, the wireless communication devices of the above-described first to fifth embodiments can be applied to communication terminal devices. Further, in the above-described third to fifth embodiments, the subcarrier to be selected is determined by the threshold value determination of the reception quality of each subcarrier, but the sub-carrier notified from the higher-level station as in the first embodiment. You may select only the number of carriers.

Each functional block used in the description of each of the above embodiments is typically realized as an LSI which is an integrated circuit. These may be individually integrated into one chip, or may be integrated into one chip so as to include a part or all of them.

Although it is referred to as LSI here, it may be referred to as IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.

Further, the method of making an integrated circuit is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. An FPGA (Field Programmable Gate Array) that can be programmed after the LSI is manufactured, or a reconfigurable processor that can reconfigure the connection and settings of circuit cells inside the LSI may be used.

Furthermore, if an integrated circuit technology that replaces an LSI appears due to advances in semiconductor technology or another technology derived from it, it is naturally possible to integrate functional blocks using that technology. There is a possibility of adaptation of biotechnology.

This specification is based on Japanese Patent Application No. 2003-288162 filed on August 6, 2003. All this content is included here.

According to the present invention, by reducing the amount of control signals to be transmitted, the data capacity that can be transmitted can be increased, the power consumption can be reduced, and the system capacity can be increased by reducing the interference with other wireless communication devices. It has a positive effect and is useful for reporting reception quality.