WO2011004530A1 - Wireless communication apparatus and wireless communication method - Google Patents

Abstract

The present invention is directed to prevention of the error rate from becoming worse in a case where a retransmission has been performed after occurrence of the overlook of a control channel. In a data allocation control channel A-MAP for downlink control signals, an HFA is transmitted which designates an uplink HFBCH resource to be used for causing an ACK/NACK to be fed back. Consecutively even-numbered and odd-numbered resources are notified as the HFA, thereby designating 2-bit FB to send back the ACK/NACK related to two pieces of data. On the receiving side, when the reception overlook of an A-MAP has been determined, two spread code sequences are subjected to a CDM process and then transmitted. On the transmitting side, when the two spread code sequences are detected as a response signal, the ACK/NACK and reception overlook are determined from the combination of the spread code sequences, and the initially transmitted data are retransmitted as the data for which the reception overlook has occurred.

Description

Wireless communication apparatus and wireless communication method

The present invention relates to a wireless communication apparatus and a wireless communication method, and more particularly to transmission of a response signal that feeds back whether transmission data can be decoded.

Recently, multimedia communication such as data communication and video communication has become very popular in wireless communication. One wireless communication standard that enables high-speed communication is called WiMAX, IEEE 802.16e was established by IEEE, and 802.16m is being studied as the next generation standard. In 802.16m, application of MIMO (Multiple Input Multiple Output) that transmits and receives a plurality of streams using a plurality of antennas is being studied.

In the wireless communication device, an ACK (Acknowledgment) or NACK (Negative Acknowledgment) is transmitted from the receiving device to the transmitting device as a response signal that feeds back whether the transmission data can be decoded. Hereinafter, these response signals are referred to as ACK / NACK. FIG. 18 is a diagram showing an ACK / NACK transmission procedure in 802.16m. Here, in a wireless communication system compatible with 802.16m, a base station (BS: Base Station) communication device is a transmitting-side wireless communication device, and a mobile station (MS: Mobile Station) terminal is a receiving-side wireless communication device. Assuming that

First, the base station BS transmits data allocation information addressed to the target terminal MS through a data allocation control channel (A-MAP: Advanced MAP). Data allocation information includes an area of data to be transmitted (resource area defined by frequency and time), a modulation scheme, a coding rate, and an area of ACK / NACK resources for returning data ACK / NACK (HFA: HARQ Feedback Allocation). , Information including the timing of replying ACK / NACK. Here, the base station BS performs HARQ (Hybrid Automatic Repeat reQuest) control that combines retransmission control and error correction according to ACK / NACK returned from the terminal MS. The terminal MS decodes the data addressed to itself based on the data allocation information and determines CRC (Cyclic Redundancy Check). Then, the terminal MS returns an ACK / NACK indicating the CRC determination result indicating whether or not decoding is possible in the area of the ACK / NACK resource allocated by the HFA.

FIG. 19 is an operation explanatory diagram showing the exchange of transmission data and ACK / NACK in 802.16m in the time direction. In the time direction, a plurality of downlink (DL: Downlink, BS → MS) subframes are consecutively allocated in frame i, and then a plurality of uplink (UL: Uplink, MS → BS) subframes are continuously allocated. The terminal MS recognizes an ACK / NACK resource that returns an ACK / NACK by the HFA in the downlink (DL) data allocation control channel (A-MAP), and feeds back a CRC determination result in the resource. In the example of FIG. 19, the base station BS transmits data allocation information including HFA = 0 to the terminal MS-A in the data allocation control channel A-MAP_0 and transmits data to the terminal MS-A. The terminal MS-A transmits ACK / NACK at the timing indicated by the data allocation control channel using the ACK / NACK resource corresponding to HFA = 0.

FIG. 20 is an operation explanatory view showing two types of ACK / NACK feedback methods in 802.16m. 802.16m defines two types of ACK / NACK feedback methods: 1-bitｂFB (1-bit Feedback) and 2-bit FB (2-bit Feedback). 20, (A) shows 1-bit１－FB, and (B) shows 2-bit FB. 1-bitｂFB is a method of feeding back one CRC determination result for one data as usual. 2-bit FB is a method of feeding back two CRC determination results simultaneously for two data. It is not explicitly notified whether 1-bit FB or 2-bit FB. In the case of 802.16m, the base station BS implicitly indicates 2-bit FB by assigning even and odd consecutive HFA values as HFA to one terminal MS.

In the allocation example of 1-bit FB in FIG. 20A, the base station BS transmits the data allocation control channel (A-MAP 0, A-MAP 1) to the terminal MS-A using A-MAP 0. On the other hand, HFA = 0 is instructed, and data is transmitted to terminal MS-A in the same subframe. In addition, the base station BS instructs the terminal MS-B to HFA = 1 with the data allocation control channel A-MAPＭ1, and transmits data to the terminal MS-B in the same subframe. Terminal MS-A uses the ACK / NACK resource corresponding to HFA = 0 to feed back ACK / NACK for data at the timing indicated by the data allocation control channel. Terminal MS-B uses the ACK / NACK resource corresponding to HFA = 1 to feed back ACK / NACK for data at the timing indicated by the data allocation control channel (the same subframe as terminal MS-A). .

In the allocation example of 2-bitｂFB in FIG. 20B, the base station BS uses HFA = 0 and MSFA for terminal MS-A in two data allocation control channels (A-MAP 0 and A-MAP 1). Instruct HFA = 1. Terminal MS-A recognizes that ACK / NACK is fed back by 2-bit FB since even and odd consecutive HFAs are assigned to the terminal MS-A. At this time, two data are transmitted from the base station BS to the terminal MS-A in the same subframe as the data allocation control channels A-MAPＭ0 and A-MAP 1, respectively. That is, the two data themselves are transmitted at different timings. Terminal MS-A uses the ACK / NACK resources corresponding to HFA = 0 and HFA = 1 to feed back ACK / NACK for two data at the timing indicated by the data allocation control channel. In this case, the transmission timing of ACK / NACK is instructed so that ACK / NACK is returned after 4 subframes in A-MAPＭ0 and after 3 subframes in A-MAP 1, and two data in the same subframe are indicated. ACK / NACK is transmitted.

FIG. 21 is a diagram showing an example of ACK / NACK resource allocation in 802.16m. In 802.16m, ACK / NACK information is transmitted from the terminal MS to the base station BS through HFBCH (HARQ Feedback Channel). The HFBCH is composed of 6 resource units (HFBCH-0 to 5). It is assumed that the HFA value of the data allocation control channel and the HFBCH resource number are defined correspondingly, and the even and odd numbers of the HFA and HFBCH resources match. This HFBCH is formed of 2 × 2 = 4 symbols in which one set is set in the direction of time and frequency, two resources are allocated to one set, three sets are provided to one unit, and six resources are allocated. Two resources of each set are multiplexed and transmitted by code division multiplexing (CDM). Here, a spreading code sequence of length 4 is allocated to 2 × 2 4 symbols of each set. Up to two spreading code sequences can be assigned to one set. Since there are four types of spreading code sequences of length 4, ACK / NACK information is transmitted in association with each spreading code sequence. A specific example of the ACK / NACK feedback method is proposed in Non-Patent Document 1, for example, and an example of assigning spreading code sequences in 1-bitｂFB and 2-bit FB is disclosed.

FIG. 22 is a diagram showing an example of assignment of spreading code sequences to be assigned to response signals, and shows assignment of spreading code sequences in each case of 1-bitｂFB and 2-bit FB. In the case of 1-bit FB, “whether the target resource of ACK / NACK is an even / odd resource” or “whether the CRC determination of data is ACK / NACK” is notified. Here, since there are four types of events, notification is performed using four spreading code sequences [C0, C1, C2, C3] assigned in each case. In the example of FIG. 22, ACK for even resources is [+ 1, + 1, + 1, + 1] (index 0), NACK for even resources is [+ 1, -1, + 1, -1] (index 1), and ACK for odd resources. Transmits [+1, +1, -1, -1] (index 2), and NACK for odd resources transmits [+1, -1, -1, +1] (index 3). If the base station BS on the receiving side knows the spreading code sequence, it can discriminate between “even / odd resources” and “ACK / NACK”. If the even / odd resources are known, it is possible to determine from which terminal MS the ACK / NACK is based on the information indicated by the data allocation control channel A-MAP.

In the case of 2-bit FB, “ACK / NACK information of even resource and odd resource” from the same terminal MS is notified. In this case, notification is performed using four spreading code sequences [C0, C1, C2, C3] assigned to the ACK / NACK combination of two resources. In the example of FIG. 22, the ACK / ACK combination is [+1, +1, +1, +1], the ACK / NACK combination is [+1, -1, +1, -1], and the NACK / ACK combination is [+1, +1]. , -1, -1] and NACK / NACK combinations transmit [+1, -1, -1, +1], respectively. In the case of 2-bit FB, since ACK / NACK for two data is represented by one spreading code sequence, CDM is not performed on one set of resources of HFBCH, and two resources are occupied.

As described above, in 802.16m, a feedback method is implicitly instructed by transmitting a data allocation control channel (A-MAP) from the base station BS to the terminal MS, and the terminal MS responds with ACK / NACK is fed back. Here, when the base station BS allocates even and odd consecutive HFAs to one terminal MS and notifies them in the data allocation control channels of a plurality of subframes, the corresponding terminal MS uses 2-bit FB. Two CRC determination results for two allocation data are fed back simultaneously. In other cases, the terminal MS feeds back one CRC determination result for one allocation data by 1-bit FB. Therefore, when performing such feedback processing, if the terminal MS misses reception of the data allocation control channel (A-MAP), there arises a problem that the type of feedback to be transmitted from the terminal MS to the base station BS is wrong. When the base station BS instructs 2-bit FB with two A-MAPs, if the terminal MS misses one of the A-MAPs, it may erroneously recognize it as 1-bit FB and give feedback. .

In order to solve this problem, for example, a method of explicitly notifying 2-bit FB from the base station BS to the terminal MS is conceivable. According to this solution, erroneous recognition of the feedback method can be prevented. If the data allocation control channel (A-MAP) is missed, NACK can be fed back with respect to data corresponding to the missed A-MAP, for example, by performing processing at the time of miss detection.

In the above solution, since data corresponding to the data allocation control channel that could not be received is fed back as NACK, the data for NACK is retransmitted. In this case, the retransmission data is actually the first transmission data.

FIG. 23 is a diagram for explaining the contents of data at the time of initial transmission and at the time of retransmission, and shows the allocation status of systematic bits and parity bits of encoded data. In the example of FIG. 23, an image in which encoded data having systematic bits and parity bits generated by encoding a bit sequence of transmission data at a mother encoding rate of 1/3 is stored in a circular buffer (cyclic buffer). Show. The SPID indicates the start position of the transmission data. The SPID starts from any one of SPID = 0 to 3, and data is read and transmitted by the amount of data corresponding to the coding rate at the time of transmission. Here, the case where the coding rate at the time of transmission is smaller than the mother coding rate is shown, and the coded data is partially transmitted. In the retransmission processing, the retransmission data is generally transmitted as data different from the initial transmission data. At the first transmission, SPID = 0 is set, and data including the most systematic bits is transmitted. At the time of retransmission, SPID = 1, 2, 3, etc., data is read from different locations in the buffer at the first transmission, the first retransmission, and the second retransmission, and different data is transmitted. On the receiving side, the reception gain at the time of initial transmission and retransmission is combined to obtain a retransmission gain. By combining the first transmission bit and the retransmission bit differently, the combined error rate characteristics can be improved.

When the above-described reproduction processing is performed and the data retransmitted in response to NACK when A-MAP is missed becomes the data of the first transmission, the error rate deteriorates because there are few systematic bits in the retransmitted data. There are challenges. FIG. 24 is a graph showing an example of the packet error rate for only the first transmission data and the first retransmission data. In FIG. 24, the vertical axis represents the block error rate BLER (Block Error Rate), and the horizontal axis represents the energy-to-noise power density ratio Eb / No (Energy-per-Bit-to-Noise Ratio) per bit. The two on the left side in the figure show the case of the first transmission (SPID = 0), and the two on the right side show the case of the first retransmission (SPID = 1). As can be seen from FIG. 24, the error rate increases only with retransmission data.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wireless communication apparatus and a wireless communication method capable of preventing deterioration of an error rate when retransmission is performed due to oversight of a control channel. It is to provide.

The present invention provides, as a first aspect, a control signal generation unit that generates a control signal including instruction information of a feedback method of a response signal to be fed back from the communication counterpart device to the own device, and a control signal and data to the communication counterpart device Including a transmission unit that transmits a signal including a reception unit that receives a response signal from the communication counterpart device, and a response signal determination unit that determines the received response signal. A first feedback method that feeds back a response signal indicating whether or not decoding can be performed on one data, and a second feedback method that feeds back a response signal that indicates whether or not decoding can be performed on two data can be used. The control signal generation unit is an instruction information for instructing the first feedback method or the second feedback method. When the response signal determination unit detects two code sequences in the response signal when instructing the second feedback method, the control signal or the data is transmitted to the communication counterpart device. There is provided a wireless communication apparatus that determines that there has been a missed reception.

Further, the present invention provides, as a second aspect, the wireless communication apparatus described above, further including a retransmission processing unit that performs a retransmission process according to a determination result of the response signal, wherein the retransmission processing unit includes the reception miss In the case where there is a determination, the data for the first transmission is included.

Further, the present invention provides, as a third aspect, the wireless communication apparatus described above, wherein the response signal indicates ACK or NACK corresponding to whether or not the data transmitted to the communication partner apparatus can be decoded. Including the code set in each feedback method of the first feedback method and the second feedback method, wherein the response signal determination unit receives the received signal corresponding to the feedback method used with the communication partner device. ACK or NACK indicated by a code is determined, and when two code sequences are detected in the response signal, ACK, NACK, and reception miss for two target data are determined by a combination of the detected code sequences Including things.

Further, the present invention provides, as a fourth aspect, the wireless communication apparatus described above, wherein the response signal uses a spread code sequence as a code sequence, and the response signal determination unit When two spread code sequences having high peaks are detected by despreading, the sequence includes one for determining that the reception is missed.

In addition, the present invention provides, as a fifth aspect, the above-described wireless communication apparatus, wherein the control signal generation unit uses a control signal including instruction information of an allocation resource of the response signal as instruction information of the feedback method. If the specific region for the second feedback method is provided in the instruction information of the allocation resource of the response signal and the second feedback method is used with the communication counterpart device, the allocation resource of the response signal The instruction information includes information for generating a control signal using the instruction information of the specific area with respect to a response signal for at least one data.

As a sixth aspect, the present invention provides a receiving unit for receiving a signal from a communication partner device, and a control signal including instruction information on a feedback method of a response signal to be fed back from the own device to the communication partner device in the received signal. A control signal acquisition unit that acquires data, a data decoding unit that decodes data in the received signal, an oversight determination unit that determines whether the control signal or the data is overlooked, the presence or absence of the reception oversight, and the data A response signal output unit that selects a code sequence to be used for the response signal according to whether decoding is possible, outputs a response signal using the selected code sequence, and a transmission unit that transmits the response signal. A first feedback method for feeding back a response signal indicating whether or not decoding is possible with respect to one piece of data, and 2 A second feedback method that feeds back a response signal indicating whether or not decoding is possible can be used, and the response signal output unit determines whether the reception is missed when the second feedback method is instructed. In this case, two code sequences are output as the response signal, and the transmission unit provides a radio communication apparatus that transmits a response signal in which the two code sequences are multiplexed.

Further, the present invention provides, as a seventh aspect, the above-described wireless communication device, wherein the response signal indicates ACK or NACK corresponding to whether or not the data received from the communication partner device can be decoded. The response signal output unit includes codes set in the respective feedback methods of the first feedback method and the second feedback method, and the response signal output unit receives two pieces of target data when the reception miss is determined. Output a combination of two code sequences indicating ACK, NACK and missed reception.

Moreover, the present invention provides, as an eighth aspect, the above-described wireless communication device, wherein the response signal output unit includes, as the two code sequences, each time unit of a response signal transmitted from the transmission unit. The output includes a combination of two spreading code sequences in which the power of transmission symbols is the same or substantially the same.

Moreover, the present invention provides, as a ninth aspect, the wireless communication apparatus described above, wherein the transmission unit includes two transmission antennas, and two code sequences output from the response signal output unit are separated from each other. This includes transmission from the transmission antenna of the system.

The tenth aspect of the present invention is the wireless communication apparatus according to the tenth aspect, wherein the response signal output unit outputs a combination of two code sequences whose phases are shifted by 90 degrees as the two code sequences. Including what to do.

As an eleventh aspect of the present invention, as an eleventh aspect, a first feedback method for feeding back a response signal indicating whether or not one data can be decoded and a response signal indicating whether or not two data can be decoded are fed back with a communication partner apparatus A wireless communication method in a wireless communication apparatus capable of using the second feedback method, wherein a control signal including instruction information indicating the first feedback method or the second feedback method is generated, and the communication Transmits a signal including a control signal and data to the partner device, receives a response signal from the communication partner device, and detects two code sequences in the received response signal when the second feedback method is instructed The communication partner device missed reception of the control signal or the data. Providing determining wireless communication method and.

As a twelfth aspect of the present invention, as a twelfth aspect, a first feedback method for feeding back a response signal indicating whether or not decoding can be performed on one piece of data and a response signal indicating whether or not decoding can be executed on two pieces of data can be fed back. A wireless communication method in a wireless communication device capable of using the second feedback method, wherein a signal from the communication partner device is received, and a response signal in the received signal is fed back from the own device to the communication partner device Obtaining a control signal including instruction information of the feedback method, decoding data in the received signal, determining whether the control signal or the data is overlooked, and when the second feedback method is instructed Outputs two code sequences as the response signal when there is a missed reception decision Provides a wireless communication method for transmitting a response signal obtained by multiplexing the two code sequences.

With the above configuration, in the case of using the second feedback method, the transmitting apparatus transmits a control signal including instruction information on the feedback method, and instructs the receiving apparatus to use the second feedback method. The receiving-side apparatus determines whether the control signal or data is missed, and outputs two code sequences as response signals when there is a missed reception when the second feedback method is instructed. A response signal in which two code sequences are multiplexed is transmitted. When the transmission side apparatus detects the two code sequences in the response signal when the second feedback method is instructed, it determines that the communication partner apparatus has missed reception of the control signal or data. Then, if there is a reception miss determination, the transmission-side apparatus gives an instruction to retransmit the data at the first transmission. As a result, in an apparatus that can use a plurality of feedback methods for an ACK / NACK response signal in accordance with an instruction of a control signal of the control channel, it prevents an error rate from deteriorating when retransmission is performed due to oversight of the control channel. It becomes possible.

According to the present invention, in an apparatus that can use a plurality of feedback methods for an ACK / NACK response signal according to an instruction of a control channel, an error rate is prevented from deteriorating when retransmission is performed due to an oversight of the control channel. It is possible to provide a wireless communication apparatus and a wireless communication method that can be used.

Operation explanatory diagram showing an example of feedback processing of ACK / NACK in the embodiment of the present invention The figure which shows the example of allocation of the HFA and HFBCH resource in embodiment of this invention The flowchart which shows the operation | movement procedure of the receiving side apparatus (terminal device) in embodiment of this invention. The flowchart which shows the operation | movement procedure of the transmission side apparatus (base station apparatus) in embodiment of this invention. The figure which shows the table of the spreading code series which shows ACK / NACK at the normal time The figure which shows the table of the spreading code sequence which shows ACK / NACK at the time of A-MAP miss The figure explaining the detail of the combination of the spreading code series at the time of A-MAP overlooking The figure explaining the A-MAP miss detection operation in the transmission side apparatus of this embodiment The block diagram which shows the structural example of the transmission side apparatus (base station apparatus) of the radio | wireless communication apparatus which concerns on embodiment of this invention. The block diagram which shows the structural example of the receiving side apparatus (terminal device) of the radio | wireless communication apparatus which concerns on embodiment of this invention. The figure explaining the transmission power of the spreading code series in a 1st embodiment FIG. 10 is a diagram showing a table of spreading code sequences indicating ACK / NACK at normal time and when A-MAP is missed in the second embodiment. The figure which shows the table | surface of the spreading code series which shows ACK / NACK at the time of normal time and A-MAP miss in 3rd Embodiment The block diagram which shows the structural example of the receiving side apparatus (terminal device) of the radio | wireless communication apparatus which concerns on 3rd Embodiment. Spread code sequence table indicating ACK / NACK when A-MAP is missed in the fourth embodiment The figure which shows the symbol arrangement | positioning on the IQ plane of the spreading code series in 4th Embodiment The block diagram which shows the structural example of the receiving side apparatus (terminal device) of the radio | wireless communication apparatus which concerns on 4th Embodiment. The figure which shows the procedure of the transmission of ACK / NACK in 802.16m Operation explanatory diagram showing transmission data and ACK / NACK exchange in the time direction in 802.16m (A), (B) is operation | movement explanatory drawing which shows the feedback method of two types of ACK / NACK in 802.16m. The figure which shows the example of allocation of the resource for ACK / NACK in 802.16m The figure which shows the example of allocation of the spreading code sequence allocated to a response signal Diagram explaining data contents at the time of first transmission and retransmission Graph showing an example of packet error rate for each data of the first transmission and the first retransmission

In the present embodiment, an example in which the wireless communication apparatus and the wireless communication method according to the present invention are applied to a wireless communication system compatible with IEEE 802.16m is shown. Here, a control signal is transmitted between the base station BS and the terminal MS, with the transmitting-side radio communication device (transmitting device) as the base station BS and the receiving-side radio communication device (receiving device) as the terminal MS of the mobile station, The configuration and operation in the case of transmitting and receiving data, response signals, etc. will be exemplified.

The downlink control signal from the base station BS to the terminal MS is transmitted on the data allocation control channel (A-MAP). The ACK / NACK response signal for the downlink data instructed by the data allocation control channel is transmitted on the HFBCH which is an uplink feedback channel from the terminal MS to the base station BS. As an ACK / NACK feedback method, 1-bit FB, which is a first feedback method that feeds back a response signal indicating whether or not decoding is possible for one data, and second response signal that shows whether or not decoding is possible for two data are fed back. It is assumed that 2-bit FB, which is the feedback method of (1), can be used.

(First embodiment)
In the present embodiment, the 1-bit FB or 2-bit FB is explicitly notified from the base station BS to the terminal MS, and the oversight of A-MAP can be detected when the 2-bit FB is used in the terminal MS. And If the terminal MS detects an A-MAP miss when the 2-bit FB is instructed, the terminal MS notifies the base station BS that the miss has occurred. As a result, the base station BS can specify whether the terminal MS has missed A-MAP reception, and can transmit the first transmission data again for the corresponding data. When notifying of missed detection, notification is made with a spreading code sequence indicating ACK / NACK so as not to change the configuration of the terminal MS on the receiving side as much as possible. Specifically, when A-MAP is missed, two spreading code sequences indicating ACK / NACK are CDMed and transmitted. Two multiplexed spreading code sequences can be separated and detected by despreading.

FIG. 1 is an operation explanatory view showing an example of ACK / NACK feedback processing in the embodiment of the present invention. In the example of FIG. 1, although the data allocation control channels A-MAP 0 and A-MAP 1 are transmitted to instruct 2-bitＭＳFB from the base station BS to the terminal MS-A, the terminal MS-A Shows a case where A-MAP 1 could not be received. In this case, terminal MS-A determines that A-MAPＭ1 when 2-bit FB is applied, and notifies base station BS by ACK / NACK feedback. At the time of notification to the base station BS, the terminal MS-A CDMs and transmits two spreading code sequences indicating ACK / NACK. There are four spreading code sequences indicating normal ACK / NACK. When A-MAP is missed, two of them are selected according to the ACK / NACK / missed state of two data corresponding to 2-bit FB. Select one to send.

The base station BS can recognize the missed A-MAP by detecting two spreading code sequences in the feedback from the terminal MS-A. The base station BS retransmits the data at the first transmission as a retransmission process when the A-MAP is missed. As a result, when A-MAP is missed, data containing many systematic bits can be retransmitted, so that the error rate characteristics of received data on the terminal side can be improved. In addition, since erroneous recognition of 1-bit 端末 FB and 2-bit FB is eliminated in both the base station and the terminal and erroneous recognition of ACK / NACK can be prevented, packet loss can be reduced.

Here, an example of a method for explicitly notifying 1-bit FB and 2-bit FB is shown. FIG. 2 is a diagram showing an example of allocation of HFA and HFBCH resources in the embodiment of the present invention. In the A-MAP, the HFA that notifies the HFBCH allocation resource is provided with 4 bits of information, and a total of 16 indexes can be used. As shown in FIG. 21, since one unit of HFBCH is 6 resources, even when 2 units of HFBCH (12 resources) are used as shown in FIG. . Here, when the ACK / NACK information is fed back, in the case of 1-bit FB, since two HFBCH resources are transmitted by CDM, intersymbol interference occurs. In the case of 2-bit FB, two HFBCH resources are occupied, so intersymbol interference does not occur and the characteristics are good. For this reason, it is preferable to use 2-bit FB as much as possible. However, the probability that all HFBCHs are transmitted in 2-bit FB is low.

Therefore, in the present embodiment, in the 4-bit HFA, the remaining four indexes when using 2 units of HFBCH are defined and used as the HFA for 2-bit FB. The receiving terminal MS receives the 2-bit 指示 FB HFA allocation notification from the transmitting base station BS, thereby recognizing the 2-bit FB instruction. Here, when receiving an instruction of 2-bit FB, only one A-MAP can be received, and if an instruction of consecutive even and odd HFBCH resources is not obtained, reception of A-MAP is missed. It can be detected.

In the example of FIG. 2, among the 16 indexes of HFA = 0 to 15, the indexes of HFA = 0 to 5 are allocated to 6 resources of HFBCH_A-0 to 5 which are HFBCH resources of the first unit, and HFA = 6 to 11 indexes are allocated to 6 resources HFBCH_B-0 to 5 which are HFBCH resources of the second unit. The surplus HFA = 12 to 15 is used as the HFA for 2-bit FB for the two units of HFBCH resources, and resource numbers of HFBCH_A-0 to 3 used for 2-bit FB are allocated to this. In such allocation of HFA and HFBCH resources, when 2-bit FB is instructed, HFA = 12 to 15 provided for 2-bit FB is selected and HFA is notified, and HFBCH corresponding to this is selected. By performing resource allocation, the resource numbers of HFBCH_A-0 to 3 at the time of 2-bit FB are notified.

In FIG. 1, the base station BS notifies the terminal MS-A of HFA = 12 using A-MAP 0 and HFA = 13 using A-MAP 1. That is, HFBCH_A-0 and 1 corresponding to HFA = 12, 13 are allocated as HFBCH resources, and allocation of even and odd consecutive resources is notified. At this time, the use of 2-bit 端末 FB is notified from the base station BS to the terminal MS-A by allocation of consecutive even and odd resources, but is notified by the HFA for 2-bit FB. The terminal MS-A can determine the instruction of 2-bit FB even if one A-MAP is missed. That is, when the terminal MS-A misses A-MAP 1 and receives only A-MAP 0, the terminal MS-A receives the notification of HFA = 12 in A-MAP 0, but the next consecutive HFA = 13 Because of the contradiction due to the absence of notification, it recognizes that A-MAP 1 is missed instead of receiving one A-MAP in the case of 1-bit FB.

When the terminal MS-A recognizes that the A-MAP is missed, the terminal MS-A switches the table of the spread code sequence indicating the ACK / NACK to that when the A-MAP is missed. At this time, two spreading code sequences indicating ACK / NACK are CDMed and transmitted to the base station BS.

FIG. 3 is a flowchart showing an operation procedure of the reception side apparatus according to the embodiment of the present invention. Here, the base station BS on the transmission side uses any one of HFA = 12 to 15 for 2-bitＢFB in the HFA of the data allocation information of A-MAP, and the resource number of the corresponding HFBCH is set to the terminal MS on the reception side. A case will be described in which 2-bit FB is instructed by notifying The terminal MS receives the data allocation control channel (A-MAP) control signal and data from the base station BS (step S11). Then, the terminal MS determines whether or not the data allocation control channel has been correctly received (step S12). If it has been received, the terminal MS determines ACK / NACK of the received data (step S13). Next, terminal MS uses a “normal table” as a table of spreading code sequences, generates a 2-bit FB response signal according to the ACK / NACK determination result, and transmits the response signal to base station BS (step S14).

If the data allocation control channel is not correctly received in step S12, the terminal MS detects the miss of the data allocation control channel and determines ACK / NACK of the received data (step S15). Next, terminal MS uses a “missing time table” as a table of spreading code sequences, and determines two spreading code sequences according to the ACK / NACK determination result. Then, a 2-bit FB response signal obtained by CDMing the two spreading code sequences is generated and transmitted to the base station BS (step S16).

FIG. 4 is a flowchart showing an operation procedure of the transmission side apparatus (base station apparatus) in the embodiment of the present invention. The base station BS on the transmission side transmits a data allocation control channel (A-MAP) control signal and data to the terminal MS on the reception side with the intention of 2-bit２－FB. Here, the base station BS uses any one of HFA = 12 to 15 for 2-bit FB in the HFA of the data allocation information of A-MAP, and notifies the resource number of the corresponding HFBCH to the terminal MS. , 2-bit FB is instructed. Thereafter, the base station BS receives a response signal from the terminal MS (step S22) and recognizes ACK / NACK of the transmitted data. Further, the base station BS detects whether the data allocation control channel is missed depending on whether two spreading code sequences are detected in the response signal (step S23). If there is an oversight here, the base station BS transmits again the data at the first transmission of the corresponding data to the terminal MS (step S24). If the data allocation control channel is not missed, it is determined whether or not the response signal is NACK (step S25). If NACK, the data at the time of retransmission of the corresponding data is transmitted to the terminal MS (step S26). ). On the other hand, in the case of ACK, the next data is transmitted to the terminal MS (step S27).

Next, a specific example of the table reading operation of the spread code sequence indicating ACK / NACK when A-MAP is missed will be described. FIG. 5 is a diagram showing a table of spreading code sequences indicating ACK / NACK at normal time, FIG. 6 is a diagram showing a table of spreading code sequences indicating ACK / NACK when A-MAP is missed, and FIG. 7 is an A-MAP missed table. It is a figure explaining the detail of the combination of the spreading code series at the time.

Here, as shown in FIG. 1, in order to instruct 2-bit 制 御 FB from the base station BS to the terminal MS, the data allocation control channels A-MAP 0 and A-MAP 1 are transmitted, and the corresponding data are also combined. The case of transmitting is illustrated. If the terminal MS can receive only one A-MAP in spite of receiving the HFA for 2-bit FB in either A-MAP 0 or A-MAP 1, the terminal MS can receive the other A-MAP Judge that you missed. In this case, the terminal MS transmits the ACK / NACK information by replacing the table with the spreading code sequence when A-MAP is missed instead of the spreading code sequence for 1-bitｂFB in the normal time.

に 関 し て For two A-MAP 0 and A-MAP 1, there are nine possible combinations of ACK / NACK / missing. Here, when both are “missing”, since ACK / NACK cannot be transmitted, a total of eight types of response signals are defined and transmitted for the normal time and the A-MAP missed time. When A-MAP is missed, two spreading code sequences are CDMed and transmitted.

In the normal time, as shown in the “normal table” in FIG. 5, the terminal MS transmits the corresponding spreading code sequences in 1-bit FB and 2-bit FB, respectively. In the case of 1-bit FB, ACK or NACK related to one target data is transmitted. When A-MAP 0 is received and the data is ACK, [+1, +1, +1, +1] is transmitted, and when the data is NACK, [+1, −1, +1, −1] is transmitted. When A-MAP－1 is received and the data is ACK, [+1, +1, −1, −1] is transmitted, and when the data is NACK, [+1, −1, −1, +1] is transmitted. . In the case of 2-bit FB, ACK or NACK related to the two target data is transmitted together. [+1, +1, +1, +1] when the data of A-MAP 0 and A-MAP 1 is an ACK / ACK combination, [+1, -1, +1, -1] when the combination is ACK / NACK, [+1, +1, -1, -1] is transmitted for the NACK / ACK combination, and [+1, -1, -1, +1] is transmitted for the NACK / NACK combination.

When the A-MAP miss is detected, as shown in the “missing time table” in FIG. 6, the terminal MS is based on the ACK / NACK of the data that can be normally received and the number of the missed A-MAP. 2 spread code sequences are determined, CDMed, and transmitted. Regarding the combination of spreading code sequences, when A-MAP 0 is normally received and A-MAP 1 is missed, if the data of A-MAP 0 is ACK, [+ 1, + 1, + 1, + 1] [+ 1, −1, +1, −1] and A-MAP 0 data of [+1, −1, −1, +1] [+1, +1, −1, −1] are respectively transmitted when NACK is NACK. If A-MAP 1 is overlooked and A-MAP 1 is normally received and the data of A-MAP 1 is ACK, [+1, +1, -1, -1] [+1, +1, +1, +1] and when the data of A-MAP 1 is NACK, [+1, −1, −1, +1] [+1, −1, +1, −1] are transmitted.

The contents of the combination of spreading code sequences when A-MAP is overlooked are as shown in FIG. The two spreading code sequences transmitted when A-MAP is overlooked are not randomly defined, but are associated with ACK / NACK in 2-bit FB in normal times. Specifically, in the normal 2-bit FB, those who can receive A-MAP correctly are ACK / ACK in the case of ACK and NACK / NACK in the case of NACK. Those who missed are defined to be a combination of ACK and NACK.

FIG. 8 is a diagram for explaining the A-MAP miss detection operation in the transmission side apparatus according to this embodiment. The transmission-side base station BS despreads the received response signal and detects a spread code sequence indicating ACK / NACK. In the case of 2-bit FB, the base station normally detects only one spreading code sequence, but the terminal detects two spreading code sequences having a high peak from the response signal when the A-MAP is missed. When the base station detects two spreading code sequences, the base station can detect an A-MAP number that was missed by a combination of spreading code sequences and an ACK / NACK for correctly received A-MAP data. In this way, if the base station can identify the missed A-MAP reception at the terminal, the first transmission data can be used as the initial transmission data and can be instructed to increase systematic bits, thereby improving communication characteristics. Is possible.

Next, configurations of a transmission side device (base station device) and a reception side device (terminal device) according to the present embodiment will be described.

FIG. 9 is a block diagram showing a configuration example of a transmission side apparatus (base station apparatus) of the wireless communication apparatus according to the embodiment of the present invention. The transmission side device includes a reception antenna 701, an FFT unit 702, a demodulation unit 703, an ACK / NACK decoding unit 704, an allocation unit 705, a data allocation control signal generation unit 706, a transmission data generation unit 707, modulation units 708 and 709, and a multiplexing unit. 710, an IFFT unit 711, and a transmission antenna 712.

The receiving antenna 701 receives the radio wave of the response signal fed back from the receiving side device (terminal device) that is the communication counterpart device, and obtains the received signal of the RF signal. The FFT unit 702 performs time-frequency conversion on the received signal to extract a multicarrier signal, and the demodulator 703 demodulates the extracted multicarrier signal. The ACK / NACK decoding unit 704 decodes ACK / NACK information from the demodulated received signal of the response signal, and acquires a spreading code sequence indicating ACK / NACK. Here, one spreading code sequence is detected in normal time, and two spreading code sequences are detected when A-MAP is missed.

The allocation unit 705 allocates resources such as transmission data and response signals, sets data allocation information in the data allocation control channel (A-MAP), and transmits the data allocation control signal generation unit 706 and the transmission data generation unit 707 to each other. Instruct. Also, the allocation unit 705 determines the ACK / NACK information output from the ACK / NACK decoding unit 704, and performs retransmission processing by HARQ according to the returned ACK / NACK. Here, when instructing 2-bit FB, the assigning unit 705 assigns an HFA for 2-bit FB in A-MAP and notifies the target terminal as described above. Specifies resource numbers of odd consecutive HFBCHs. Further, when two spreading code sequences are detected in the 2-bitｂFB response signal, allocating section 705 recognizes that A-MAP is missed at the receiving side device, and performs retransmission processing when A-MAP is missed. An instruction is given to retransmit the data at the first transmission.

The data allocation control signal generation unit 706 generates a control signal to be transmitted on the data allocation control channel (A-MAP) based on the data allocation information from the allocation unit 705, and the modulation unit 708 performs data allocation according to a predetermined modulation scheme. Modulate the control signal. The transmission data generation unit 707 generates and holds data for transmission based on the input transmission data sequence, and reads and outputs the data based on the coding rate and the number of transmissions. The modulation unit 709 modulates data using a predetermined modulation method. QPSK, 16QAM, 64QAM, or the like is used as a modulation method of the modulation units 708 and 709.

The multiplexing unit 710 performs frequency domain and time domain allocation on the modulated data allocation control signal and data, and multiplexes the transmission signal. The IFFT unit 711 performs frequency-time conversion of the transmission signal to generate a transmission signal of the RF signal, and the transmission antenna 712 transmits the RF signal transmission signal as a radio wave to the reception side device (terminal device) that is the communication counterpart device. Send.

FIG. 10 is a block diagram showing a configuration example of the receiving side device (terminal device) of the wireless communication device according to the embodiment of the present invention. The reception side device includes a reception antenna 801, an FFT unit 802, a demodulation unit 803, a data decoding unit 804, a CRC determination unit 805, an allocation signal decoding unit 806, an allocation signal miss determination unit 807, a table selection unit 808, and an ACK / NACK sequence determination. 809, a modulation unit 810, an IFFT unit 811, and a transmission antenna 812.

The reception antenna 801 receives a radio wave of a transmission signal transmitted from a transmission side device (base station device) that is a communication partner device, and obtains an RF signal reception signal. The FFT unit 802 performs time-frequency conversion of the received signal to extract a multicarrier signal, and the demodulator 803 demodulates the extracted multicarrier signal. The data decoding unit 804 decodes data from the received signal of the demodulated transmission signal, and the CRC determination unit 805 performs CRC determination on the data decoding result and outputs the CRC determination result.

The allocation signal decoding unit 806 decodes the data allocation control signal transmitted in the data allocation control channel (A-MAP), and acquires data allocation information including HFA. The allocation signal miss determination unit 807 determines whether the data allocation control signal is missed based on the contents of the HFA in the acquired data allocation information. The table selection unit 808 selects a spread code sequence table indicating ACK / NACK in accordance with the missed determination result of the data allocation control signal. Here, the table selection unit 808 selects the “normal table” that defines the normal spreading code sequence shown in FIG. 5 when the A-MAP is not missed, and shows the diagram when the A-MAP is missed. The “missing time table” defining the spread code sequence when the A-MAP is missed shown in FIG. 6 is selected. That is, when it is determined that the A-MAP is missed, the spread code sequence is switched.

The ACK / NACK sequence determination unit 809 determines the ACK / NACK spreading code sequence according to the CRC determination result in the CRC determination unit 805 using the table of the spreading code sequence selected by the table selection unit 808. If there is an A-MAP miss, two spreading code sequences are determined based on the ACK / NACK of the received data and the missed A-MAP number. Modulation section 810 modulates the determined ACK / NACK spreading code sequence using a predetermined modulation scheme. At this time, the modulation unit 810 allocates a spreading code sequence to the HFBCH resource corresponding to the HFA notified from the base station, and performs CDM on the two spreading code sequences if there is an A-MAP miss. When 1-bit FB is instructed from the base station, two HFBCH resources (feedback resources allocated to two terminals) that form a pair are CDMed. The IFFT unit 811 performs frequency-time conversion of the transmission signal to generate an RF signal transmission signal, and the transmission antenna 812 transmits the RF signal transmission signal to the transmission side apparatus (base station apparatus) that is the communication counterpart apparatus. Send as.

As described above, according to the present embodiment, in the radio communication apparatus that can use a plurality of feedback methods of 1-bit FB and 2-bit FB with respect to an ACK / NACK response signal according to an instruction of the control channel, It is possible to notify the transmitting side device that the control channel is overlooked without changing the configuration of the receiving side device as much as possible. In the transmission side device, when the control channel is missed, the data of the first transmission can be retransmitted to retransmit the data containing many systematic bits, and the error rate characteristic of the received data can be improved. .

(Second Embodiment)
The second embodiment is an example in which the spreading code sequence used for the response signal in the first embodiment described above is partially changed. Here, the description will focus on the differences from the first embodiment, and the description of the same points as in the first embodiment will be omitted as appropriate.

FIG. 11 is a diagram for explaining the transmission power of the spreading code sequence in the first embodiment. In the first embodiment, when two spreading code sequences indicating ACK / NACK are combined by CDM, the combined sequence at the time of CDM transmission is [+2, 0, +2, 0], [+2, 0, -2, 0. ], [+2, +2, 0, 0], [+2, -2, 0, 0]. When this composite sequence is assigned to the HFBCH resource shown in FIG. 21, the first, third, second and fourth of the four symbols are assigned to the same time unit resource. Therefore, when [+2, 0, +2, 0] and [+2, 0, -2, 0] are transmitted in the composite sequence, the power of the symbol transmitted at the first time is transmitted at the next time. Since it is much larger than the power of the symbol and the transmission power difference in time units is large, there is a problem that the transmission power at the terminal of the receiving side apparatus cannot be effectively used.

Therefore, in the second embodiment, a part of the spreading code sequence of the “normal table” used at the normal time is partially replaced, and the definition of the combination of the two spreading code sequences to be CDMed in the “missing time table” used when the A-MAP is missed. Is left as is. That is, a combination of spreading code sequences in the “missing time table” is determined and used based on a “normal table” in which the spreading code sequences are partially replaced.

FIG. 12 is a diagram showing a table of spreading code sequences indicating ACK / NACK at the normal time and A-MAP missed time in the second embodiment. In the example of FIG. 12, the codes of 2-bitＡＣＫFB ACK / NACK and NACK / NACK in the normal state are switched with respect to the first embodiment shown in FIGS. When A-MAP is missed, A-MAPＭ0 is normally received, and when A-MAP 1 is missed and the data of A-MAP 0 is ACK, [+ 1, + 1, + 1, + 1] [+ 1, -1, -1, + 1] and A-MAP－0 data is NACK, [+1, +1, -1, -1] [+1, -1, +1, -1] are transmitted, respectively. In addition, when A-MAP 1 is missed and A-MAP 受 信 1 is normally received and the data of A-MAP 1 is ACK, [+ 1, + 1, + 1, + 1] [+ 1, + 1, −1, − 1] and [+1, −1, −1, +1] [+1, −1, +1, −1] are transmitted when the data of A-MAPＭ1 is NACK, respectively. By changing the combination of spreading code sequences as described above, the combined sequence at the time of CDM transmission is [+2, 0, 0, +2], [+2, 0, 0, -2], [+2, +2, 0, 0], [+2, -2, 0, 0]. In this case, the power of each transmission symbol for each time unit of the response signal to be transmitted is the same or substantially the same.

In the second embodiment, the transmission power for each time is almost the same in the HFBCH, and the transmission power in the time unit after the CDM is balanced, so that the transmission power at the terminal of the receiving apparatus is effectively used. Can do.

(Third embodiment)
The third embodiment is an example in which two systems of response signal transmission antennas are provided in the receiving side device, and two spread code sequences are transmitted from another system of transmission antennas. Here, the description will focus on the differences from the first embodiment, and the description of the same points as in the first embodiment will be omitted as appropriate.

FIG. 13 is a diagram showing a table of spreading code sequences indicating ACK / NACK at the normal time and when A-MAP is missed in the third embodiment. In the third embodiment, the same spreading code sequence as that used in the first embodiment shown in FIG. 6 is used as the spreading code sequence used for the ACK / NACK response signal, and these two spreading code sequences are respectively transmitted by antennas of different systems. Send. That is, the sequence 1 spreading code sequence used during normal time and A-MAP miss is transmitted from the first transmission antenna (antenna 1), and the sequence 2 spreading code sequence used when A-MAP is missed is transmitted to the second transmission antenna ( Transmit from antenna 2). Note that the spreading code sequence of the second embodiment described above may be used.

FIG. 14 is a block diagram illustrating a configuration example of a receiving side device (terminal device) of the wireless communication device according to the third embodiment. In addition to the configuration of the first embodiment in FIG. 10, the reception-side apparatus includes a modulation unit 820, an IFFT unit in parallel with a modulation unit 810, an IFFT unit 811, and a transmission antenna 812, following the ACK / NACK sequence determination unit 809. 821 and a transmission antenna 822. When the A-MAP is missed, the modulation unit 810, the IFFT unit 811 and the transmission antenna 812 transmit the sequence 1 spreading code sequence, and the modulation unit 820, the IFFT unit 821 and the transmission antenna 822 transmit the sequence 2 spreading code sequence.

In the third embodiment, there is no spread code sequence synthesizing process inside the modulation unit or the like in the transmission unit of the terminal of the reception side device. Thereby, the transmission power in the terminal of the receiving device can be effectively used.

(Fourth embodiment)
The fourth embodiment is an example in which the phases of two spreading code sequences used for a response signal are transmitted by being shifted by 90 degrees. Here, the description will focus on the differences from the first embodiment, and the description of the same points as in the first embodiment will be omitted as appropriate.

FIG. 15 is a diagram showing a table of spreading code sequences indicating ACK / NACK when A-MAP is missed in the fourth embodiment. In the fourth embodiment, as the spreading code sequence used for the ACK / NACK response signal, the phase of the sequence 2 is shifted by 90 degrees with respect to the sequence 1 based on that of the first embodiment shown in FIG. A spreading code sequence is used. In other words, when A-MAP 0 is normally received when A-MAP is missed and A-MAP 1 is missed, if the data of A-MAP 0 is ACK, [+1, + 1, + 1, + 1] [ + J, -j, + j, -j], and when the data of A-MAPＭ0 is NACK, [+1, -1, -1, +1] [+ j, + j, -j, -j] are transmitted. Further, when A-MAPＭ1 is missed and A-MAP 1 is normally received and the data of A-MAP 1 is ACK, [+1, +1, -1, -1] [+ j, + j, + j, + J] and when data of A-MAP－1 is NACK, [+1, −1, −1, +1] [+ j, −j, + j, −j] are transmitted.

FIG. 16 is a diagram showing the symbol arrangement on the IQ plane of the spread code sequence in the fourth embodiment. As shown in FIG. 16, the sequence 1 spreading code sequence is a +1 or -1 symbol on the I axis in the IQ plane, and the sequence 2 spreading code sequence is a + j or -j symbol on the Q axis in the IQ plane. It is. When the above spreading code sequence is used, the composite sequence at the time of CDM transmission is [1 + j, 1-j, 1 + j, 1-j], [1 + j, -1 + j, -1-j, 1-j], [1 + j, 1 + j, −1−j, 1 + j] and [1 + j, −1−j, −1 + j, 1−j].

FIG. 17 is a block diagram illustrating a configuration example of a receiving side device (terminal device) of the wireless communication device according to the fourth embodiment. The receiving side device differs in the function of the modulation unit 830 as compared to the configuration of the first embodiment of FIG. Modulating section 830 performs phase rotation processing according to the spreading code sequence determined by ACK / NACK sequence determining section 809, and CDMs two spreading code sequences whose phases are shifted from each other by 90 degrees.

In the fourth embodiment, since the same transmission power can be transmitted in all symbols after the CDM, it is possible to effectively use the transmission power in the terminal of the reception side device.

The present invention is intended to be variously modified and applied by those skilled in the art based on the description in the specification and well-known techniques without departing from the spirit and scope of the present invention. Included in the scope for protection. Moreover, you may combine each component in the said embodiment arbitrarily in the range which does not deviate from the meaning of invention.

In addition, although demonstrated as an antenna in the said embodiment, it is applicable similarly also with an antenna port. An antenna port refers to a logical antenna composed of one or a plurality of physical antennas. That is, the antenna port does not necessarily indicate one physical antenna, but may indicate an array antenna composed of a plurality of antennas. For example, in LTE, it is not defined how many physical antennas an antenna port is composed of, but is defined as a minimum unit by which a base station can transmit different reference signals (Reference signals). The antenna port may be defined as a minimum unit for multiplying the weight of a precoding vector (Precoding vector).

In each of the above embodiments, the case where the present invention is configured by hardware has been described as an example, but the present invention can also be realized by software.

Further, each functional block used in the description of each of the above embodiments is typically realized as an LSI that is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them. Although 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 circuit integration is not limited to LSI, and implementation with a dedicated circuit or a general-purpose processor is also possible. An FPGA (Field Programmable Gate Array) that can be programmed after manufacturing the LSI or a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.

Furthermore, if integrated circuit technology that replaces LSI emerges as a result of progress in semiconductor technology or other derived technology, it is naturally possible to integrate functional blocks using this technology. Biotechnology can be applied.

This application is based on a Japanese patent application (Japanese Patent Application No. 2009-160005) filed on Jul. 6, 2009, the contents of which are incorporated herein by reference.

The present invention has an effect that it is possible to prevent deterioration of an error rate when retransmission is performed due to oversight of a control channel. For example, wireless communication applicable to a wireless communication system such as IEEE 802.16m It is useful as an apparatus and a wireless communication method.

701 Reception antenna 702 FFT unit 703 Demodulation unit 704 ACK / NACK decoding unit 705 Assignment unit 706 Data allocation control signal generation unit 707 Transmission data generation unit 708, 709 Modulation unit 710 Multiplexing unit 711 IFFT unit 712 Transmission antenna 801 Reception antenna 802 FFT unit 803 Demodulation unit 804 Data decoding unit 805 CRC determination unit 806 Allocation signal decoding unit 807 Allocation signal miss determination unit 808 Table selection unit 809 ACK / NACK sequence determination unit 810, 820, 830 Modulation unit 811, 821 IFFT unit 812, 822 Transmit antenna

Claims (12)

1. A control signal generating unit that generates a control signal including instruction information of a feedback method of a response signal to be fed back from the communication partner device to the own device;
   A transmission unit for transmitting a signal including a control signal and data to the communication partner device;
   A receiver for receiving a response signal from the communication partner device;
   A response signal determination unit for determining the received response signal,
   The own apparatus feeds back a response signal indicating whether or not decoding can be performed on one piece of data with the communication partner apparatus, and second feedback that feeds back a response signal indicating whether or not decoding is possible on two pieces of data. And can be used
   The control signal generation unit generates a control signal including instruction information for instructing the first feedback method or the second feedback method;
   When the response signal determination unit detects two code sequences in the response signal when instructing the second feedback method, the communication partner device has missed reception of the control signal or the data. A wireless communication device for determining.
2. The wireless communication device according to claim 1,
   A retransmission processing unit that performs a retransmission process according to a determination result of the response signal;
   The retransmission processing unit is a wireless communication device that retransmits data at the time of initial transmission when the reception miss is determined.
3. The wireless communication device according to claim 1,
   The response signal indicates each of the first feedback method and the second feedback method for indicating ACK (Acknowledgment) or NACK (Negative Acknowledgment) corresponding to whether or not the data transmitted to the communication partner apparatus can be decoded. Including the code set in the feedback method of
   The response signal determination unit determines an ACK or NACK indicated by the received code corresponding to a feedback method used with a communication partner apparatus, and detects two code sequences in the response signal. In this case, the wireless communication apparatus determines ACK, NACK, and reception miss with respect to two pieces of target data based on the combination of the detected code sequences.
4. The wireless communication device according to claim 1,
   The response signal uses a spreading code sequence as a code sequence,
   The said response signal determination part is a radio | wireless communication apparatus which determines that the said reception miss was missed, when despreading the said response signal and detecting two spreading code sequences with a high peak.
5. The wireless communication device according to claim 1,
   The control signal generation unit generates a control signal including instruction information of the allocation resource of the response signal as instruction information of the feedback method, and for the second feedback method in the instruction information of the allocation resource of the response signal When a specific area is provided and the second feedback method is used with the communication counterpart device, the instruction information of the specific area is used for the response signal for at least one data as the instruction information of the response signal allocation resource. A wireless communication device that generates a control signal.
6. A receiving unit for receiving a signal from a communication partner device;
   A control signal acquisition unit for acquiring a control signal including instruction information of a feedback method of a response signal to be fed back from the own device to the communication partner device in the received signal;
   A data decoding unit for decoding data in the received signal;
   An oversight determination unit for determining whether the control signal or the data is overlooked;
   A response signal output unit that selects a code sequence to be used for the response signal according to whether or not the reception is missed and whether or not the data can be decoded, and outputs a response signal using the selected code sequence;
   A transmission unit for transmitting the response signal,
   The first apparatus feeds back a response signal indicating whether or not decoding is possible for one data, and the second feedback method is to feed back a response signal indicating whether or not decoding is possible for two data. And can be used
   The response signal output unit outputs two code sequences as the response signal when the reception miss is determined when the second feedback method is instructed,
   The transmission unit is a wireless communication device that transmits a response signal in which the two code sequences are multiplexed.
7. The wireless communication device according to claim 6,
   The response signal indicates each of the first feedback method and the second feedback method for indicating ACK (Acknowledgment) or NACK (Negative Acknowledgment) corresponding to whether or not the data received from the communication partner apparatus can be decoded. Including the code set in the feedback method of
   The said response signal output part is a radio | wireless communication apparatus which outputs the combination of two code series which shows ACK, NACK regarding 2 data of object, and reception miss, when the reception miss is judged.
8. The wireless communication device according to claim 6,
   The response signal output unit includes a combination of two spreading code sequences such that the power of each transmission symbol for each time unit of the response signal transmitted from the transmission unit is the same or substantially the same as the two code sequences. A wireless communication device to output.
9. The wireless communication device according to claim 6,
   The transmission unit includes two transmission antennas, and transmits two code sequences output from the response signal output unit from separate transmission antennas.
10. The wireless communication device according to claim 6,
    The response signal output unit outputs a combination of two code sequences whose phases are shifted by 90 degrees from each other as the two code sequences.
11. It is possible to use a first feedback method for feeding back a response signal indicating whether or not decoding can be performed on one data and a second feedback method for feeding back a response signal indicating whether or not decoding can be performed on two pieces of data with a communication partner device. A wireless communication method in a wireless communication device,
    Generating a control signal including instruction information indicating the first feedback method or the second feedback method;
    Transmitting a signal including a control signal and data to the communication partner device;
    Receiving a response signal from the communication partner device;
    Wireless communication for determining that reception of the control signal or the data is missed in the communication counterpart device when two code sequences are detected in the received response signal when the second feedback method is instructed; Method.
12. It is possible to use a first feedback method for feeding back a response signal indicating whether or not decoding can be performed on one data and a second feedback method for feeding back a response signal indicating whether or not decoding can be performed on two pieces of data with a communication partner device. A wireless communication method in a wireless communication device,
    Receiving a signal from the communication partner device;
    Obtaining a control signal including instruction information of a feedback method of a response signal to be fed back from the own device to the communication partner device in the received signal;
    Decoding data in the received signal;
    Determine whether to miss the control signal or the data;
    When there is a determination of missed reception when the second feedback method is instructed, two code sequences are output as the response signal,
    A wireless communication method for transmitting a response signal in which the two code sequences are multiplexed.

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