JP5478645B2 - Wireless communication system - Google Patents

Description

  The present invention relates to a radio communication system in a next generation mobile communication system.

  In a UMTS (Universal Mobile Telecommunications System) network, HSDPA (High Speed Downlink Packet Access) or HSUPA (High Speed Uplink Packet Access) is adopted for the purpose of improving frequency utilization efficiency and peak data rate. A system based on CDMA (Wideband Code Division Multiple Access) is maximally extracted. For this UMTS network, Long Term Evolution (LTE) has been studied for the purpose of further improving frequency utilization efficiency and peak data rate, and reducing delay (Non-Patent Document 1). In LTE, unlike W-CDMA, as a multi-access method, a method based on OFDMA (Orthogonal Frequency Division Multiple Access) is used for the downlink (downlink), and SC-FDMA (Single Carrier) is used for the uplink (uplink). A method based on Frequency Division Multiple Access) is used.

  As shown in FIG. 1, a signal transmitted in the uplink is mapped to an appropriate radio resource and transmitted from the mobile terminal apparatus to the radio base station apparatus. In this case, user data (UE (User Equipment) # 1, UE # 2) is assigned to an uplink shared channel (PUSCH: Physical Uplink Shared Channel). Control information is time-multiplexed with PUSCH when transmitted simultaneously with user data, and is assigned to an uplink control channel (PUCCH) when only control information is transmitted. The control information transmitted in the uplink includes a retransmission response signal (ACK / NACK) for a downlink quality information (CQI: Channel Quality Indicator) or a downlink shared channel (PDSCH: Physical Downlink Shared Channel) signal. Etc. are included.

  In PUCCH, typically, different subframe configurations are adopted when CQI and ACK / NACK are transmitted (see FIGS. 2A and 2B). The PUCCH subframe configuration includes seven SC-FDMA symbols in one slot (1/2 subframe). Further, one SC-FDMA symbol includes 12 information symbols (subcarriers). Specifically, in the CQI subframe configuration (CQI format), as shown in FIG. 2A, the second symbol (# 2) and the sixth symbol (# 6) in the slot receive reference signals (RS: Reference). Signal) is multiplexed, and control information (CQI) is multiplexed to other symbols (first symbol (# 1), third symbol (# 3) to fifth symbol (# 5), seventh symbol (# 7)). Is done. Also, in the ACK / NACK subframe configuration (ACK / NACK format), as shown in FIG. 2B, the reference signal is multiplexed in the third symbol (# 3) to the fifth symbol (# 5) in the slot. Then, control information (ACK / NACK) is multiplexed on other symbols (first symbol (# 1), second symbol (# 2), sixth symbol (# 6), and seventh symbol (# 7)). . In one subframe, the slot is repeated twice. Also, as shown in FIG. 1, the PUCCH is multiplexed on radio resources at both ends of the system band, and frequency hopping (Inter-slot FH) is applied between two slots having different frequency bands in one subframe.

3GPP, TR25.912 (V7.1.0), "Feasibility study for Evolved UTRA and UTRAN", Sept. 2006

  The third generation system (W-CMDA) can generally achieve a transmission rate of about 2 Mbps at the maximum on the downlink using a fixed band of 5 MHz. On the other hand, in the LTE system, a transmission rate of about 300 Mbps at the maximum in the downlink and about 75 Mbps in the uplink can be realized using a variable band of 1.4 MHz to 20 MHz. In addition, in the UMTS network, a successor system of LTE is also being studied for the purpose of further improving the frequency utilization efficiency and the peak data rate (for example, sometimes referred to as “LTE advanced” or “LTE enhancement”). (Hereinafter referred to as “LTE-A”).

  In the LTE-A system, with the goal of further improving the frequency utilization efficiency, peak throughput, and the like, allocation of frequencies wider than LTE is being studied. In LTE-A (for example, Rel. 10), backward compatibility with LTE is one requirement, and a basic frequency block having a bandwidth that can be used by LTE ( A transmission band configuration having a plurality of component carriers (CC) is adopted. For this reason, the feedback control information for the data channel transmitted by a plurality of downlink CCs simply increases to the number of CCs. In addition to these, technologies unique to LTE-A such as multi-cell cooperative transmission / reception technology and MIMO (Multiple Input Multiple Output) technology using more transmission / reception antennas than LTE are being studied, and feedback for controlling them. An increase in control information is also conceivable. For this reason, since the amount of feedback control information increases, it is necessary to study a method for transmitting feedback control information in an uplink channel.

  The present invention has been made in view of such a point, and in a communication system having a system band composed of a plurality of basic frequency blocks, wireless communication capable of efficiently transmitting feedback control information through an uplink control channel An object is to provide a system.

  The radio communication system of the present invention is a radio communication system in which a radio base station apparatus and a mobile terminal apparatus perform radio communication using a system band composed of a plurality of basic frequency blocks, and the radio base station apparatus includes a plurality of radio base station apparatuses. Each of the basic frequency blocks transmits a downlink shared channel signal, and the mobile terminal apparatus transmits a retransmission response signal to the reception of the downlink shared channel signal in the plurality of basic frequency blocks based on a mapping table. The mapping table is defined by bit information by phase shift keying and selection information of a plurality of allocated resources of the uplink control channel, and is mapped to an uplink control channel of a frequency block, and the plurality of basic A first in which each frequency block is one codeword transmission In the case of being composed of this frequency block and the second fundamental frequency block, the number of allocated resources is defined as 2, and further, ACK, NACK, and DTX, which are retransmission response signals of the first fundamental frequency block, are individually defined. On the other hand, the DTX that is the retransmission response signal of the second basic frequency block is not individually defined.

  According to this configuration, it is possible to transmit additional information defined by channel selection information in addition to bit information based on phase shift keying, so that feedback control information of a plurality of basic frequency blocks is transferred to an existing PUCCH in an uplink control channel. It is possible to transmit efficiently while using the configuration.

  According to the present invention, it is possible to efficiently transmit feedback control information through an uplink control channel.

It is a figure for demonstrating the channel structure which maps the signal of an uplink. It is a figure which shows a physical uplink control channel format. It is a figure which shows an example of the method of transmitting the state of the retransmission response signal of a several fundamental frequency block using the uplink control channel of a specific fundamental frequency block. It is a figure which shows the mapping table of the retransmission response signal prescribed | regulated by Format 1a / 1b of LTE (Rel.8). It is a figure which shows an example of the mapping table applied to transmission of the retransmission response signal which concerns on this Embodiment. It is a figure which shows an example of the mapping table applied to transmission of the retransmission response signal which concerns on this Embodiment. It is a figure which shows an example of the mapping table applied to transmission of the retransmission response signal which concerns on this Embodiment. It is a figure which shows an example of the mapping table applied to transmission of the retransmission response signal which concerns on this Embodiment. It is a figure for demonstrating the structure of the mobile communication system which has the mobile terminal device and radio base station apparatus which concern on this Embodiment. It is a figure which shows schematic structure of the mobile terminal device which concerns on embodiment of this invention. It is a figure which shows schematic structure of the radio base station apparatus which concerns on embodiment of this invention. It is a figure which shows an example of the mapping table applied to transmission of the retransmission response signal which concerns on this Embodiment. It is a figure which shows an example of the mapping table applied to transmission of the retransmission response signal which concerns on this Embodiment. It is a figure which shows an example of the mapping table applied to transmission of the retransmission response signal which concerns on this Embodiment.

  As described above, for the downlink shared channel (PDSCH) signal of the downlink CC, a retransmission response signal (ACK / NACK) that is feedback control information is transmitted on the uplink control channel (PUCCH). The retransmission response signal is expressed by an acknowledgment (ACK: Acknowledgement) indicating that the transmission signal has been properly received or a negative acknowledgment (NACK: Negative Acknowledgement) indicating that it has not been properly received.

  In the LTE-A system, allocation of a frequency wider than LTE is studied with the goal of further improving frequency utilization efficiency, peak throughput, etc., and a basic frequency block having a bandwidth that can be used by LTE ( A transmission band configuration having a plurality of (CC) is employed. For this reason, it is conceivable that a retransmission response signal, which is feedback control information for the PDSCH transmitted from a plurality of downlink CCs, is also transmitted to the plurality of downlink CCs.

  As a method of transmitting feedback control information in this case, in the mobile terminal apparatus, each component carrier is based on signals for each of a plurality of component carriers (here, CC # 1, CC # 2) received from the radio base station apparatus. When there is no PUSCH signal transmitted in the same subframe, it is mapped to a user-specific (UE-specific) component carrier (here, CC # 1) uplink control channel (PUCCH) Then, it is possible to transmit (see FIG. 3).

  Further, as described above, both reception channel quality information (CQI) and retransmission response signal (ACK / NACK) transmitted on PUCCH are transmitted in 12 subcarrier bands. When transmitting a retransmission response signal, 3SC-FDMA symbols are used for RS among 7SC-FDMA symbols in one slot. Orthogonal CDMA by twelve cyclic shifts is defined in one SC-FDMA symbol. Furthermore, by combining the allocation of time-domain orthogonal codes over three SC-FDMA symbols, a maximum of 12 × 3 = 36 channels can be multiplexed ( Resource).

  By the way, in LTE (Rel. 8), notification of ACK / NACK (Format 1a / 1b) for a downlink shared channel (PDSCH) signal is defined (see FIG. 4), and the following multiple states can be notified. It has become.

  In the case of 1 codeword transmission (rank 1), there are three states of “ACK”, “NACK”, and “DTX (Discontinuous reception)” (see FIG. 4A), and 2 codeword transmission (rank 2) In this case, there are five states of “ACK, ACK”, “ACK, NACK”, “NACK, ACK”, “NACK, NACK”, and “DTX” (see FIG. 4B).

  The code word refers to a coding unit for channel coding (error correction coding), and one or a plurality of code words are transmitted when MIMO multiplexing transmission is applied. In LTE, a maximum of 2 codewords are used in single user MIMO. In the case of two-layer transmission, each layer is an independent codeword, and in the case of four-layer transmission, one codeword is provided for every two layers.

  In FIG. 4, “ACK” means that transmission was successful, “NACK” means that an error has been detected, and “DTX” means that data has not been recognized (no response). The DTX is a determination result that “ACK and NACK were not notified from the mobile terminal apparatus”, which means that the mobile terminal apparatus could not receive a downlink control channel (PDCCH). . In this case, since the mobile terminal apparatus does not detect that the PDSCH is transmitted to its own station, neither ACK nor NACK is transmitted as a result. On the other hand, when receiving the ACK, the radio base station apparatus transmits the next new data, but in the case of NACK or a DTX state where there is no response, the radio base station apparatus performs retransmission control so as to retransmit the transmitted data. Note that the radio base station apparatus can determine that it is DTX when the received power in the resource allocated to ACK / NACK in the uplink is equal to or less than a predetermined value.

  In the mapping table of FIG. 4, “0” indicates that the mobile terminal apparatus does not transmit information to the radio base station apparatus in the subframe, and “1”, “−1”, “j”, “−j” represents a predetermined phase state (bit information). For example, in FIG. 4A, “1” and “−1” correspond to “0” and “1”, respectively, and can represent 1-bit information. In FIG. 4B, “1”, “−1”, “j”, and “−j” correspond to data of “00”, “11”, “10”, and “01”, respectively. Two bits of information can be represented. Therefore, in ACK / NACK (Format 1a / 1b), transmission of up to 2 bits is possible.

  However, when a PDSCH signal is received using a plurality of CCs, the user terminal UE changes the above-mentioned 3 states (1 codeword) or 5 states (2 codewords) to a specific CC (for example, CC # 1). However, there is a problem that the number of bits of the retransmission response signal increases.

  Therefore, the present inventor, when aggregating and transmitting retransmission response signals for the downlink shared channel signals of a plurality of CCs to the uplink control channel of a specific CC, a plurality of allocated resources in the uplink control channel. (Channel) is selected, and the states of the retransmission response signals of a plurality of CCs are defined by bit information by phase shift keying and resource selection information which is a selection position of allocated resources, and the present invention is completed. It was.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, an example in which the present invention is applied to LTE-A will be described, but the present invention is not limited to the case where it is applied to LTE-A. The present invention may be applied to any communication system as long as it is a communication system that transmits uplink control information in the uplink in carrier aggregation in which a plurality of fundamental frequency blocks are integrated to widen the band.

  Moreover, in the following description, although the case where the number of downlink CCs is two is demonstrated, this invention is not limited to this, The number of downlink CCs (or the number of uplink CCs) is two (or 1). It can be applied even if there are more cases. Moreover, although the case where the number of allocation resources is two or four is demonstrated, the number of allocation resources is not restricted to this. Further, although the retransmission response signal (ACK / NACK / DTX) will be described as feedback control information mapped to the uplink control channel, the present invention is not limited to this.

  FIG. 5 specifies the states of retransmission response signals of PCC and SCC in a system band composed of a first basic frequency block (PCC: Primary Component Carrier) and a second basic frequency block (SCC: Second Component Carrier). Shows the mapping table. The mobile terminal apparatus maps the retransmission response signal to the uplink control channel based on the mapping table and transmits it to the radio communication apparatus.

  FIG. 5A shows an example of a mapping table when the number of allocated resources for transmission of a retransmission response signal is two when no spatial multiplexing is applied to PCC and SCC (rank 1). Yes. Three states (ACK, NACK, DTX) are defined per CC, and nine combinations of PCC and SCC states are conceivable.

  In FIG. 5A, the three states “ACK”, “NACK”, and “DTX” of the PCC retransmission response signal are defined by bit information by phase shift keying (here, QPSK data modulation), and the SCC retransmission is performed. The three states “ACK”, “NACK”, and “DTX” of the response signal are resource selection information (“channel selection (Channel selection (Channel)”) indicating which resource is selected from the two allocated resources (Ch1, Ch2). selection)) information ”). When the number of allocated resources is 2, 1-bit information can be added as resource selection information. Therefore, when combined with bit information by QPSK data modulation, 3-bit information can be supported.

  For example, in the case of 1 codeword transmission, when bit information by QPSK data modulation is individually assigned and notified to the three states “DTX”, “NACK”, and “ACK” of the PCC retransmission response signal Can assign information bits of “j (10)” to “DTX”, “1 (00)” to “NACK”, and “−1 (11)” to “ACK”. In this case, since information bits can be independently assigned to “DTX” of PCC, it is possible to individually notify the radio base station apparatus that it is in the “DTX” state (Explicit DTX signaling).

  When both PCC and SCC are “DTX”, all the allocated resources are set to “0”, and transmission is not performed in the subframe.

  The state of the SCC retransmission response signal is defined by 1-bit resource selection information. Here, two states of “DTX” or “NACK” and “ACK” are determined by the resource selection information, and the number of states that can be notified individually is reduced. Specifically, when Ch1 is selected from the allocated resources (when bit information is mapped to Ch1 and transmitted), the SCC state is either “DTX” or “NACK”. When Ch2 is selected (when bit information is mapped to Ch2 and transmitted), this represents an “ACK” state. In other words, for the SCC state, the resource selection information is defined so that the “ACK” state can be distinguished, and the “DTX” and “NACK” states are combined. The number of bits is saved by setting.

  When the retransmission response signal is “DTX” or “NACK”, since the radio base station apparatus performs retransmission control so as to retransmit the transmitted data, even if it is not possible to distinguish between DTX and NACK The impact is small. On the other hand, when the retransmission response signal is “ACK”, since the radio base station apparatus transmits the next new data, it is preferable to prescribe so that the AKC state can be distinguished preferentially. Therefore, as shown in FIG. 5A, when the number of allocated resources is two (adding 1-bit information by resource selection), the “ACK” state can be distinguished with priority in SCC. It is preferable to define.

  As described above, by specifying the two allocation resources with the bit information based on the phase shift keying and the resource selection information, it is possible to support 3-bit information. In addition, as compared with the case where bit information is allocated to both of the two allocation resources, by assigning bit information to only one resource, it is possible to maintain the single carrier characteristic.

  Moreover, when setting CC (UE-specific CC) which a mobile terminal apparatus uses preferentially (aggregate the retransmission response signal of several CC) among two CCs, CC to give priority (here,) PCC) is preferably defined by bit information by QPSK data modulation, and is defined by resource selection information for other CCs (here, SCC). Thus, since a large number of bits can be supported for the state of the PCC retransmission response signal, the state of the PCC retransmission response signal can be defined in detail and notified. For example, in the mapping table shown in FIG. 5A, it is possible to support the PCC so that it can individually notify that it is in the “DTX” state (Explicit DTX signaling).

  FIG. 5B shows an example of a mapping table in the case where spatial multiplexing is applied to PCC and SCC (rank 2) and the number of allocated resources for retransmission response signal transmission is two. Yes.

  Also in FIG. 5B, the PCC state is defined by bit information by phase shift keying (here, QPSK data modulation), and the SCC state is defined by resource selection information.

  In the case of 2-codeword transmission, with respect to the state of each layer of the PCC, the information bits are not assigned to “DTX” alone, and the four states “ACK, ACK”, “ACK, NACK”, “NACK, Preferably, bit information is individually assigned to “ACK”, “NACK, NACK / DTX” and notified.

  Specifically, layer 1 and layer 2 are “−1” for “ACK, ACK”, “j” for “ACK, NACK”, “−j”, “NACK,” for “NACK, ACK”. Bit information of “1” is defined in “NACK” or “DTX”. That is, in the case of two codewords, one information bit “1” is assigned to the “NACK, NACK” or “DTX” state of the PCC, and the number of states that can be notified individually is reduced. . As described above, in the case of 2-codeword transmission, it is preferable to prescribe that no information bit is assigned to the PCC DTX alone. That is, in the mapping table shown in FIG. 5, the PCC DTX is encoded and notified only for one codeword, but the DTX alone is not notified for two codewords.

  In addition, regarding the state of each layer of SCC, in the case of 2-codeword transmission, the state of “DTX”, “NACK, NACK”, “NACK, ACK” or “ACK, NACK” with 1-bit resource selection information , “ACK, ACK” are preferably defined. In this case, when DTX or NACK is included, the number of states that can be notified individually is reduced without being defined independently, so that “ACK, ACK” can be preferentially distinguished. Specifically, when Ch1 is selected from the two allocation resources, the SCC status is any one of “DTX”, “NACK, NACK”, “NACK, ACK” or “ACK, NACK”. When Ch2 is selected, it indicates that the state is “ACK, ACK”. In other words, for the SCC state, apply spatial bundling and determine each state so that ACK is returned only when both layers are ACK when transmitting two codewords, and NACK is returned otherwise. Can do.

  Also in the case of 2-codeword transmission, the state of the PCC retransmission response signal to be used preferentially is defined by bit information by QPSK data modulation, the state of the SCC retransmission response signal is defined by resource selection information, By defining the bit information and the resource selection information so that “ACK, ACK” can be distinguished, the number of bits can be saved and the feedback control information can be transmitted efficiently.

  Next, FIG. 6 shows an example of the mapping table when the number of allocated resources is four.

  FIG. 6A shows an example of a mapping table when no spatial multiplexing is applied to PCC and SCC (rank 1), and FIG. 6B shows an example of a mapping table when spatial multiplexing is applied to PCC and SCC (rank 2). Show.

  6 (A) and 6 (B), the states “ACK”, “NACK”, and “DTX” of the PCC retransmission response signal are defined by bit information by phase shift keying (here, QPSK data modulation), and SCC The resource selection information indicating which resource is selected from the four resources (Ch1 to Ch4) to which the retransmission response signal states “ACK”, “NACK”, and “DTX” are assigned. When the number of allocated resources is 4, 2-bit information can be added by the resource selection information. Therefore, 4-bit information can be supported when combined with bit information by QPSK data modulation.

  In the case of 1 codeword transmission (see FIG. 6A), the bit information by QPSK data modulation is individually assigned to the three PCC states “DTX”, “NACK”, and “ACK” and notified. Do. For example, “j (10)” can be assigned to “DTX”, “1 (00)” can be assigned to “NACK”, and “−1 (11)” can be assigned to “ACK”. In this case, since information bits can be independently assigned to “DTX”, it is possible to notify the radio base station apparatus that it is in the “DTX” state (Explicit DTX signaling).

  In addition, since the state of “DTX”, “NACK”, and “ACK” can be determined by the 2-bit resource selection information for the SCC state, the “DTX”, “NACK”, and “ACK” Thus, resource selection information can be individually assigned and notified. For example, among the allocated resources (Ch1 to Ch4), when Ch1 is selected, the SCC state is “DTX”, and when Ch2 is selected, the SCC state is “NACK”. When Ch3 is selected, it can be determined that the state is “ACK”. In this case, an information bit can be independently assigned to “DTX” of SCC. In the case of 1 codeword transmission (see FIG. 6A), Ch4 is not necessarily required.

  In the case of 2-codeword transmission (see FIG. 6B), regarding the state of each layer of the PCC, information bits are not assigned to “DTX” alone, and the four states “ACK, ACK” / “ It is preferable to perform notification by individually assigning bit information to “ACK, NACK” / “NACK, ACK” / “NACK, NACK / DTX”.

  Specifically, PCC layer 1 and layer 2 are “−1” for “ACK, ACK”, “j” for “ACK, NACK”, “−j” for “NACK, ACK”, “ Bit information of “1” is defined in “NACK, NACK” or “DTX”. That is, in the case of 2 codewords, by assigning one information bit “1” to the state of “NACK, NACK” or “DTX”, the number of states that can be notified individually is reduced. Savings are being made.

  In addition, when the number of allocated resources is 4, the state of each layer of the SCC can be supported by 2-bit resource selection information. Therefore, as in the case of the PCC, regarding the state of each layer of the SCC, the information bits are not assigned to “DTX” alone, and the four states “ACK, ACK” / “ACK, NACK” / “NACK, ACK” / For “NACK, NACK / DTX”, resource selection information may be individually assigned and notified.

  Specifically, when Ch1 is selected from the two allocated resources, this indicates that the state of the SCC is “DTX” or “NACK, NACK”, and Ch2 is selected. Represents the state of “NACK, ACK”, represents the state of “ACK, NACK” when Ch3 is selected, and represents the state of “ACK, ACK” when Ch4 is selected. Represents that. That is, for the SCC state, resource selection information is defined so that at least one of the layers is in the “ACK” state, and the states of “DTX”, “NACK, NACK” are combined. A predetermined number of bits can be saved.

  Next, a mapping table different from the mapping table described above will be described with reference to FIGS. 7 and 8, when the SCC is DTX, the PCC is defined to be equivalent to the mapping table of ACK / NACK (Format 1a / 1b) of LTE (Rel. 8). In addition, with respect to the PCC or SCC, the PCC state and the SCC state are respectively determined by QPSK data modulation so that it is possible to individually notify the radio base station apparatus that it is in the “DTX” state (Explicit DTX signaling). It is defined by combining bit information and resource selection information.

  FIG. 7 shows an example of a mapping table when the number of allocated resources is two. FIG. 7A shows a case where no spatial multiplexing is applied to the PCC (rank 1), and FIG. A case of applying spatial multiplexing (rank 2) is shown. 7A and 7B show the cases of rank 1 and rank 2 with respect to the state of the SCC.

  When the PCC is one codeword transmission (see FIG. 7A), the three states “DTX”, “NACK”, and “ACK” of the PCC retransmission response signal are related to the state of the SCC retransmission response signal. Are defined using bit information and resource selection information by QPSK data modulation, respectively. Here, it sets so that the information notified when SCC is DTX can be distinguished independently.

  For example, when the SCC is in the “DTX” state, an information bit of “1” is assigned to “NACK” of the PCC and “−1” is assigned to “ACK”, and Ch1 is selected (the information bit is selected). Mapping to Ch1). On the other hand, when the SCC is in a state other than “DTX”, information bits “−j” and “j” are assigned to “NACK” and “ACK” of PCC. When the PCC state is “DTX”, “1” information bits (when at least “NACK” is included in the SCC), “−1” (when the SCC is “ACK”, depending on the state of the SCC. ”Only) and Ch2 is selected (the information bit is mapped to Ch2). When both PCC and SCC are “DTX”, all the allocated resources are set to “0”.

  In this way, the three PCC states “DTX”, “NACK”, and “ACK” are defined using bit information and resource selection information by QPSK data modulation in consideration of the relationship with the SCC state, and the SCC By setting the information notified in the case of DTX so that it can be distinguished independently, the state of the retransmission response signal of the PCC and SCC can be specified in more detail and notified. Further, by defining the mapping table as shown in FIG. 7A, when the SCC is DTX, the mapping table of LTE (Rel. 8) ACK / NACK (Format 1a) (see FIG. 4A above) Reference). Thereby, the mapping table for PCC can be made common regardless of the presence or absence of carrier aggregation, and instantaneous interruption of communication during the process of switching the presence or absence of carrier aggregation can be prevented. In addition, as shown in FIG. 7A, by defining the notification information when the PCC or SCC is in the DTX state separately from the other notification information, the wireless base station apparatus can specify “DTX”. ”State (Explicit DTX signaling) becomes possible.

  When the PCC is a 2-codeword transmission (see FIG. 7B), the SCC states for the four PCC states “NACK, NACK”, “NACK, ACK”, “ACK, NACK”, “ACK, ACK” Are defined using bit information and resource selection information based on QPSK data modulation.

  Specifically, when the SCC includes “DTX” or “NACK” for the four states of PCC “NACK, NACK”, “NACK, ACK”, “ACK, NACK”, “ACK, ACK” , “1”, “−j”, “j”, “−1” are assigned, and Ch1 is selected. On the other hand, when the SCC includes only “ACK”, Ch2 is selected, and “−j” is allocated when the PCC includes “NACK”, and “j” is allocated when the PCC is “ACK, ACK”. It prescribes.

  When the PCC is “DTX”, as shown in FIG. 7A, an information bit of “1” (when at least “NACK” is included in the SCC) according to the state of the SCC, “− An information bit of 1 ″ (when SCC is “ACK” only) is assigned, and Ch2 is selected. Therefore, even if the PCC is rank 2, information bits can be allocated independently for the “DTX” of the PCC, and the radio base station apparatus is notified that it is in the “DTX” state (Explicit DTX signaling) can do. Further, by defining a mapping table as shown in FIG. 7B, when the SCC is DTX, the mapping table of LTE (Rel. 8) ACK / NACK (Format 1b) (FIG. 4B above) Reference). Thereby, the mapping table for PCC can be made common regardless of the presence or absence of carrier aggregation, and instantaneous interruption of communication during the process of switching the presence or absence of carrier aggregation can be prevented.

  Next, FIG. 8 shows an example of the mapping table when the number of allocated resources is four.

  FIG. 8A shows an example of a mapping table when no spatial multiplexing is applied to PCC (rank 1), and FIG. 8B shows an example of a mapping table when spatial multiplexing is applied to PCC (rank 2). 8A and 8B show the cases of rank 1 and rank 2 for SCC.

  In FIG. 8A, when the SCC is in the “DTX” state, an information bit of “1” is assigned to “NACK” of PCC and “−1” is assigned to “ACK”, and Ch1 is selected. . On the other hand, when the SCC is in a state other than “DTX”, information bits “−j” and “j” are assigned to “NACK” and “ACK” of PCC. When the PCC state is “DTX”, “1” information bits (when at least “NACK” is included in the SCC), “−1” (when the SCC is “ACK”, depending on the state of the SCC. ”Only), and Ch other than Ch1 is selected. When both PCC and SCC are “DTX”, all the allocated resources are set to “0”. By using the mapping table shown in FIG. 8 (A), the notification information when the PCC or SCC is in the DTX state can be separately distinguished from the other notification information. It is possible to individually notify that the SCC is in the “DTX” state (Explicit DTX signaling).

  In FIG. 8B, the SCC consists of only “DTX” or “NACK” for the four states of PCC “NACK, NACK”, “NACK, ACK”, “ACK, NACK”, “ACK, ACK”. In this case, “1”, “−j”, “j”, “−1” are assigned and Ch1 is selected. On the other hand, when the SCC includes only “ACK”, Ch2 is selected, and “−j” is allocated when the PCC includes “NACK”, and “j” is allocated when the PCC is “ACK, ACK”. It prescribes. Each state can be defined by selecting Ch3 when the SCC is “NACK, ACK” and by selecting Ch4 when the SCC is “ACK, NACK”.

  By using the mapping table shown in FIG. 8, it is possible to define and notify the state of the PCC and SCC retransmission response signals in detail. Further, when the SCC is DTX, it can be equivalent to the LTE (Rel. 8) ACK / NACK (Format 1a / 1b) mapping table (see FIG. 4 above).

  In addition, although the case where the number of allocation resources is 2 or 4 is described in the mapping table described above, the number of allocation resources is not limited to this. Further, the number of allocated resources can be determined from various viewpoints. For example, as an example of a method for determining the number of allocated resources, it can be determined according to the number of codewords.

  Specifically, when both PCC and SCC are one codeword, two resources are allocated (number of allocated resources is two), and one of PCC and SCC is one codeword and the other is two codewords 3 resources can be allocated (3 allocated resources), and when both PCC and SCC are 2 codewords, 4 resources can be allocated (4 allocated resources). Thus, by determining the number of resources to be allocated according to the number of codewords, the number of resources to be allocated can be minimized.

  Hereinafter, an example of a mapping table in which the number of allocated resources is controlled according to the number of code words will be described with reference to FIGS. FIG. 12 shows a case where both PCC and SCC are one codeword (number of allocated resources is two), and FIG. 13 shows a case where one of PCC and SCC is one codeword and the other is two codewords (allocation). FIG. 14 shows a case where both PCC and SCC are two codewords (number of allocated resources is 4).

  12 to 14, when the SCC is DTX, the PCC is defined to be equivalent to the LTE (Rel.8) ACK / NACK (Format 1a / 1b) mapping table. In addition, when at least PCC is one codeword, the PCC state and the SCC state can be individually notified (Explicit DTX signaling) that the PCC is in the “DTX” state to the radio base station apparatus. Are defined in combination with bit information and resource selection information by QPSK data modulation.

  When PCC and SCC are 1 codeword transmission (see FIG. 12), two resources are allocated, and the state of the PCC retransmission response signal and the state of the SCC retransmission response signal are selected by bit information and resource selection by QPSK data modulation. Specify using information. Also, the information notified when the PCC is DTX is set so that it can be distinguished independently.

  For example, when the PCC is in the “DTX” state, an information bit of “1” is assigned to the “NACK” of the SCC and “−1” is assigned to the “ACK”, and Ch2 is selected (the information bit is selected). Mapping to Ch2). When the SCC is in the state of “DTX” or “NACK”, information bits “1” are assigned to “NACK” and “−1” are assigned to “ACK”, and Ch1 is selected. As described above, the number of states that can be notified individually can be reduced by defining the SCC “DTX” or “NACK” without individually allocating information bits. When the SCC is in the “ACK” state and the PCC is not “DTX”, the information bit “j” is assigned, Ch1 is selected for the “NACK” of the PCC, and the “ACK” of the PCC is selected. On the other hand, Ch2 is selected. When both PCC and SCC are “DTX”, all the allocated resources are set to “0”.

  By defining the mapping table as shown in FIG. 12, when the SCC is DTX, it is equivalent to the LTE (Rel.8) ACK / NACK (Format 1a) mapping table (see FIG. 4A). can do. In addition, as shown in FIG. 12, the notification information in the case where the PCC is in the DTX state is distinguished from other notification information and is singly defined so that the radio base station apparatus is in the “DTX” state. It becomes possible to perform notification (Explicit DTX signaling) alone.

  When one of PCC and SCC is one codeword and the other is two codewords (see FIG. 13), three resources are allocated, and the state of the PCC retransmission response signal and the state of the SCC retransmission response signal are represented by QPSK data. It is defined using bit information and resource selection information by modulation.

  For example, when the PCC is 2-codeword transmission and the SCC is 1-codeword transmission (see FIG. 13A), the four states of the PCC “NACK, NACK”, “NACK, ACK”, “ACK, NACK”, “ If the SCC is “DTX” with respect to “ACK, ACK”, “1”, “−j”, “j”, “−1” are assigned and Ch1 is selected. Thereby, when SCC is DTX, it can be equivalent to the LTE (Rel.8) ACK / NACK (Format 2a) mapping table (see FIG. 4B).

  In addition, when the PCC is in the “DTX” or “NACK” state, an information bit of “1” is assigned to the “NACK” of the SCC and “−1” is assigned to the “ACK”, and Ch2 is selected. To do. That is, the number of states that can be notified is reduced without individually defining the PCC “DTX” or “NACK” states.

  Also, “−j” and “j” are assigned to “NACK, ACK” and “ACK, NACK” of PCC, respectively, Ch3 is selected for “NACK” of SCC, and “ACK” of SCC is selected. Selects Ch2. When SCC is other than “DTX”, Ch3 is selected for “ACK, ACK” of PCC, “−1” is assigned to “NACK” of SCC, and “ACK” is assigned to “ACK”. Assign “1”.

  When PCC is 1 codeword transmission and SCC is 2 codeword transmission (see FIG. 13B), when PCC is in “DTX” state, select a specific Ch (here, Ch2), otherwise For other PCC states, select another Ch. Thereby, the notification information when the PCC is in the DTX state can be defined separately from the other notification information. Here, Ch2 is selected when the PCC is in the “DTX” state, and “−j” for each of the three SCC states “NACK, ACK”, “ACK, NACK”, and “ACK, ACK”. , “J”, “−1” are assigned. Further, when the PCC is in the “DTX” state and the SCC is “NACK, NACK”, “DTX”, all allocated resources are set to “0”, and transmission is not performed in the subframe. ing.

  Also, when SCC is in the state of “DTX” or “NACK”, “1” is assigned to “NACK” of PCC and “−1” is assigned to “ACK”, and Ch1 is selected. By doing so, the number of states that can be notified individually is reduced. When the SCC is in the state of “NACK, ACK” or “ACK, NACK”, information bits of “−j” and “j” are allocated, and Ch3 is selected for “NACK” of PCC. Then, Ch1 is selected for “ACK”. When the SCC is in the “ACK, ACK” state, Ch3 is selected, “−1” is assigned to “NACK” of PCC, and “1” is assigned to “ACK”.

  When both the PCC and the SCC are two codewords (see FIG. 14), four resources are allocated, and the state of the PCC retransmission response signal and the state of the SCC retransmission response signal are expressed as bit information by QPSK data modulation. Defined using resource selection information.

  For example, when the SCC is “DTX” or “NACK”, Ch1 is selected, and the PCC four states “NACK, NACK”, “NACK, ACK”, “ACK, NACK”, “ACK, ACK” are selected. , “1”, “−j”, “j”, and “−1” are assigned, respectively. Thereby, when SCC is DTX, it can be equivalent to the LTE (Rel.8) ACK / NACK (Format 2a) mapping table (see FIG. 4B).

  When SCC is other than “DTX” or “NACK, NACK”, Ch2 is selected for “DTX”, “NACK, NACK” of PCC, and “NACK, ACK”, “ACK, NACK” of SCC is selected. "-J", "j", and "-1" are assigned to "ACK" and "ACK", respectively, to reduce the number of states that can be notified individually.

  Further, when the SCC is other than “ACK, ACK”, “−j”, “j”, “−1” are respectively obtained for “NACK, ACK”, “ACK, NACK”, and “ACK, ACK” of the PCC. ”And Ch3 is selected when the SCC is“ NACK, ACK ”, and Ch4 is selected when the SCC is“ ACK, NACK ”. Further, when the PCC is other than “DTX” or “NACK, NACK”, “1” is assigned to “ACK, ACK” of SCC, Ch4 is selected for “NACK, ACK” of PCC, and Ch3 is selected for “ACK, NACK” of PCC, and Ch2 is selected for “ACK, ACK” of PCC.

  Note that the mapping tables shown in FIGS. 12 to 14 are examples, and the mapping tables applicable in the present invention are not limited to this. In addition, the relationship between the number of codewords and the number of allocated resources is not limited to this. For example, when both the PCC and the SCC are one codeword, four resources may be allocated (see FIG. 6). When one of the SCCs is one codeword and the other is two codewords, two or four resources may be allocated (see FIGS. 7 and 8).

  Hereinafter, configurations of a mobile terminal apparatus, a radio base station apparatus, and the like to which the radio communication method described in the above embodiment is applied will be described. Here, a case where a radio base station apparatus and a mobile terminal apparatus corresponding to an LTE-A system (LTE-A system) is used will be described.

  First, the mobile communication system 10 including the mobile terminal device 100 and the radio base station device 200 will be described with reference to FIG. FIG. 9 is a diagram for explaining a configuration of the mobile communication system 10 including the mobile terminal apparatus 100 and the radio base station apparatus 200 according to an embodiment of the present invention. Note that the mobile communication system 10 illustrated in FIG. 9 is a system including an LTE system, for example. In addition, the mobile communication system 10 may be called IMT-Advanced or 4G.

As illustrated in FIG. 9, the mobile communication system 10 includes a radio base station apparatus 200 and a plurality of mobile terminal apparatuses 100 (100 ₁ , 100 ₂ , 100 ₃ ,... 100 _n , which communicate with the radio base station apparatus 200. , N is an integer of n> 0). Radio base station apparatus 200 is connected to core network 40. The mobile terminal apparatus 100 communicates with the radio base station apparatus 200 in the cell 50. The core network 40 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.

  In the mobile communication system 10, OFDMA is applied to the downlink and SC-FDMA is applied to the uplink as the radio access scheme.

  OFDMA is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier. SC-FDMA is a single carrier transmission method in which data is mapped to a continuous band for each terminal for communication, and a plurality of terminals use different bands to realize multi-access.

  Here, a communication channel in the LTE system will be described. For downlink, PDSCH that transmits traffic data of each mobile terminal apparatus 100, and L1 / L2 control information such as RB allocation information in PDSCH, data modulation scheme / channel coding rate, and retransmission related information to each mobile terminal apparatus PDCCH etc. which notify are used. Further, reference signals used for channel estimation, reception quality measurement and the like are transmitted together with these channels.

  For the uplink, PUSCH for transmitting traffic data of each mobile terminal apparatus 100, channel quality information (CQI) report for downlink frequency scheduling, and L1 / L2 control information such as ACK / NACK for downlink transmission data are transmitted. PUCCH or the like is used. Also, a demodulation reference signal used for channel estimation and a channel quality measurement reference signal used for channel quality measurement are transmitted together with these channels.

  Next, with reference to FIG. 10, the functional configuration of a mobile terminal apparatus that transmits uplink control information using the mapping table described above will be described.

  In the following description, when uplink control information is transmitted from the mobile terminal apparatus in the uplink, a plurality of users are orthogonally multiplexed using a cyclic shift of the CAZAC code sequence, and a retransmission response signal as feedback control information is transmitted. A case of transmission will be described. In the following description, a case where a retransmission response signal for a downlink shared channel received from two CCs is specified and transmitted is shown, but the number of CCs and feedback control information are not limited thereto.

  The mobile terminal apparatus shown in FIG. 10 includes a transmission unit and a reception unit. The reception unit includes an OFDM signal demodulation unit 1401 that demodulates the OFDM signal, and an ACK / NACK / DTX determination unit 1402 that determines ACK / NACK / DTX based on the downlink signal. The transmission unit includes a control information transmission channel selection unit 1201, an uplink shared channel (PUSCH) processing unit 1000, an uplink control channel (PUCCH) processing unit 1100, an SRS processing unit 1300, a channel multiplexing unit 1202, and an IFFT. Part 1203 and CP providing part 1204.

  The OFDM signal demodulator 1401 receives and demodulates the downlink OFDM signal. That is, CP is removed from the downlink OFDM signal, fast Fourier transform is performed, subcarriers to which the BCH signal or downlink control signal is assigned are extracted, and data demodulation is performed. When downlink OFDM signals are received from a plurality of CCs, data demodulation is performed for each CC. OFDM signal demodulation section 1401 outputs the downlink signal after data demodulation to ACK / NACK / DTX determination section 1402.

  The ACK / NACK / DTX determination unit 1402 determines whether or not the received downlink shared channel signal (PDSCH signal) has been received without error. If the downlink shared channel signal has been received without error, an ACK or error is detected. If it is detected, each status of NACK is output as a determination result, and if no downlink shared channel signal is detected, each state of DTX is output as a determination result. When a plurality of CCs are allocated for communication with the radio base station apparatus, it is determined whether or not the downlink shared channel signal can be received without error for each CC. The ACK / NACK / DTX determination unit 1402 determines the above three states for each codeword. When transmitting two code words, the above three states are determined for each code word. ACK / NACK / DTX determination section 1402 outputs the determination result to the transmission section (here, control information transmission channel selection section 1201).

  Control information transmission channel selection section 1201 selects a channel for transmitting a retransmission response signal that is feedback control information. Specifically, it is determined whether to transmit in the uplink shared channel (PUSCH) or to transmit in the uplink control channel (PUCCH). For example, if there is a PUSCH signal in the subframe at the time of transmission, the PUSCH signal is output to the uplink shared channel processing unit 1000, and the retransmission response signal is mapped to the PUSCH and transmitted. On the other hand, if there is a PUSCH signal in the subframe, the PUSCH signal is output to the uplink control channel processing unit 1100, and the retransmission response signal is mapped to the PUCCH and transmitted.

  Uplink shared channel processing section 1000 includes control information bit determining section 1006 that determines the bits of the retransmission response signal based on the determination result of ACK / NACK / DTX determining section 1402 and error correction coding of the ACK / NACK bit sequence. A channel encoding unit 1007 that performs error correction encoding on a data sequence to be transmitted, data modulation units 1002 and 1008 that perform data modulation on the encoded data signal, and the modulated data signal and retransmission A time multiplexing unit 1003 that time-multiplexes the response signal, a DFT unit 1004 that performs DFT (Discrete Fourier Transform) on the time-multiplexed signal, and a subcarrier mapping unit 1005 that maps the signal after DFT to a subcarrier. .

  The uplink control channel processing unit 1100 is modulated by the channel selection control unit 1101 that controls allocation resources and allocation information used for retransmission response signal transmission, the PSK data modulation unit 1102 that performs PSK data modulation, and the PSK data modulation unit 1102. A cyclic shift section 1103 for applying a cyclic shift to the received data, a block spreading section 1104 for performing block spreading on the signal after the cyclic shift using a block spreading code, and a subcarrier mapping section 1105 for mapping the signal after the block spreading to a subcarrier. And have.

  The channel selection control unit 1101 controls selection of resources to map the retransmission response signal based on the mapping table. Specifically, based on the mapping table shown in FIG. 5 to FIG. 8, FIG. 12 to FIG. 14 and the like and the determination result of the ACK / NACK / DTX determination unit 1402, a resource for mapping bit information is selected, Notify PSK data modulation section 1102, cyclic shift section 1103, block spreading section 1104, and subcarrier mapping section 1105.

  For example, PCC and SCC are 1 codeword, the number of allocated resources is 2, PCC state is “NACK”, SCC state is “ACK”, and the mobile terminal apparatus has the mapping table of FIG. In this case, the channel selection control unit 1101 notifies that the bit information “1” is mapped to Ch2. Note that the mobile terminal device may have a plurality of mapping tables, and the plurality of mapping tables may be selectively used according to a predetermined condition.

  The method for determining the number of allocated resources is not particularly limited, and may be determined by a method set in advance, a method selected by the mobile terminal apparatus based on the determination result of the ACK / NACK / DTX determination unit 1402, or a notification from the radio communication apparatus A determination method or the like can be used. As an example of a method for determining the number of allocated resources, it can be determined according to the number of codewords as described above. For example, when both PCC and SCC are one codeword, two resources are allocated, when one of PCC and SCC is one codeword and the other is two codewords, three resources are allocated, and PCC and If both SCCs are 2 codewords, 4 resources can be allocated.

  The PSK data modulation unit 1102 performs phase shift keying (PSK data modulation) based on information notified from the channel selection control unit 1101 based on the mapping table. For example, the PSK data modulation section 1102 modulates to 2-bit bit information by QPSK data modulation.

  Cyclic shift section 1103 performs orthogonal multiplexing using a cyclic shift of a CAZAC (Constant Amplitude Zero Auto Correlation) code sequence. Specifically, the time domain signal is shifted by a predetermined cyclic shift amount. Note that the cyclic shift amount differs for each user and is associated with a cyclic shift number. Cyclic shift section 1103 outputs the signal after cyclic shift to block spreading section 1104. Block spreading section (orthogonal code multiplying means) 1104 multiplies the reference signal after the cyclic shift by the orthogonal code (block spread). Here, the OCC (block spreading code number) used for the reference signal may be notified from the upper layer by RRC signaling or the like, or the OCC previously associated with the CS of the data symbol may be used. Block spreading section 1104 outputs the signal after block spreading to subcarrier mapping section 1105.

  Subcarrier mapping section 1105 maps the block spread signal to the subcarrier based on the information notified from channel selection control section 1101. Further, subcarrier mapping section 1105 outputs the mapped signal to channel multiplexing section 1202.

  The SRS processing unit 1300 includes an SRS signal generation unit 1301 that generates an SRS signal (Sounding RS), and a subcarrier mapping 1302 that maps the generated SRS signal to a subcarrier. Subcarrier mapping 1302 outputs the mapped signal to channel multiplexing section 1202.

  The channel multiplexing unit 1202 time-multiplexes the signal from the uplink shared channel processing unit 1000 or the uplink control channel processing unit 1100 and the reference signal from the SRS signal processing unit 1300, and a transmission signal including the uplink control channel signal To do.

  IFFT section 1203 performs IFFT on the channel-multiplexed signal and converts it into a time domain signal. IFFT section 1203 outputs the signal after IFFT to CP giving section 1204. CP assigning section 1204 assigns a CP to the signal after orthogonal code multiplication. Then, an uplink transmission signal is transmitted to the radio communication apparatus using an uplink channel of a specific CC.

  Next, with reference to FIG. 11, the functional configuration of the radio base station apparatus that receives the uplink control information transmitted from the mobile terminal apparatus shown in FIG. 10 will be described.

  The mobile terminal apparatus shown in FIG. 11 includes a transmission unit and a reception unit. The transmission unit includes an OFDM signal generation unit 2401 that generates an OFDM signal for each of a plurality of CCs. The OFDM signal generation unit 2401 maps downlink signals including other downlink channel signals and uplink resource allocation information signals to subcarriers, performs inverse fast Fourier transform (IFFT), and adds a CP, thereby adding a downlink transmission signal. Generate.

  The receiving unit includes a CP removing unit 2204 that removes the CP from the received signal, an FFT unit 2203 that performs fast Fourier transform (FFT) on the received signal, and a channel that separates the multiplexed signals (PUSCH signal, PUCCH signal, SRS signal). It has a separation unit 2202, an uplink shared channel (PUSCH) reception unit 2000, an uplink control channel (PUCCH) reception unit 2100, and an SRS signal reception unit 2300 that process signals after channel separation.

  Uplink shared channel receiving section 2000 includes subcarrier demapping section 2005 that demaps the signal after channel separation, IDFT section 2004 that performs IDFT (Inverse Discrete Fourier Transform) on the signal after subcarrier demapping, and IDFT. Control information separating section 2003 for separating the separated data signal and control signal, data demodulating sections 2002 and 2007 for demodulating the separated data signal and control signal, respectively, and channel decoding section 2001 for channel-decoding the signal after data demodulation , 2006.

  The uplink control channel receiving unit 2100 includes a subcarrier demapping unit 2104 that demaps the signal after channel separation, and a deblock spreading unit that despreads the signal after subcarrier demapping using a block spreading code (OCC). 2103, a cyclic shift separation unit 2102 that removes the cyclic shift from the signal after despreading and separates the target user's signal, and a channel selection data detection unit 2101 that controls the resource candidate information based on the mapping table. doing.

  Based on the mapping table, channel selection data detection section 2101 notifies retransmission response signal candidate information to subcarrier demapping section 2104, inverse block spreading section 2103, and cyclic shift separation section 2102, and retransmission response information for each CC. Is detected. The mapping table of the base station device may be common to the mapping table of the mobile terminal device.

  The control information transmission channel selection unit 2201 detects a channel used for transmission of a retransmission response signal that is feedback control information, and controls output switching from the uplink shared channel reception unit 2000 or the uplink control channel reception unit 2100. To do. When the retransmission response signal is included in the PUSCH and transmitted, the information output from the uplink shared channel receiving unit 2000 is output as the retransmission response signal. When the retransmission response signal is transmitted on the PUCCH, the information output from the uplink control channel receiving unit 2100 is output as the retransmission response signal.

  The SRS signal receiving unit 2300 includes a subcarrier demapping unit 2302 for demapping the SRS signal after channel separation, and an SRS reception quality measuring unit 2301 for measuring the reception quality of the SRS signal after subcarrier demapping. Yes.

  As long as it does not deviate from the scope of the present invention, the number of processing units and processing procedures in the above description can be appropriately changed and implemented. Each element shown in the figure represents a function, and each functional block may be realized by hardware or software. Other modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Mobile communication system 40 Core network 50 Cell 100 Mobile terminal apparatus 200 Wireless base station apparatus 1000 Uplink shared channel processing part 1001 Channel encoding part 1002, 1008 Data modulation part 1003 Time multiplexing part 1004 DFT part 1005 Subcarrier mapping part 1006 Control Information bit determination unit 1100 Uplink control channel processing unit 1101 Channel selection control unit 1102 PSK data modulation unit 1103 Cyclic shift unit 1104 Block spreading unit 1105 Subcarrier mapping unit 1201 Control information transmission channel selection unit 1202 Channel multiplexing unit 1203 IFFT unit 1204 CP Giving unit 1300 SRS signal processing unit 1401 OFDM signal demodulating unit 1402 ACK / NACK / DTX determining unit 2000 Uplink sharing Channel receiver 2001, 2006 Channel decoder 2002, 2007 Data demodulator 2003 Control information separator 2004 IDFT part 2005 Subcarrier demapping part 2100 Uplink control channel receiver 2101 Channel selection data detector 2102 Cyclic shift separator 2103 Inverse block Spreading unit 2104 Subcarrier demapping unit 2201 Control information transmission channel selecting unit 2202 Channel separating unit 2203 FFT unit 2204 CP removing unit 2300 SRS signal receiving unit 2401 OFDM signal generating unit

Claims (1)

A wireless communication system in which a wireless base station device and a mobile terminal device perform wireless communication using a system band composed of a plurality of fundamental frequency blocks,
The radio base station apparatus transmits a downlink shared channel signal in each of a plurality of basic frequency blocks,
The mobile terminal apparatus transmits a retransmission response signal for reception of a downlink shared channel signal in the plurality of basic frequency blocks, mapped to an uplink control channel of a specific basic frequency block based on a mapping table,
The mapping table is defined by bit information by phase shift keying and selection information of a plurality of allocated resources of the uplink control channel, and each of the plurality of basic frequency blocks is one codeword transmission. When configured with a frequency block and a second fundamental frequency block, the number of allocated resources is defined as 2, and further, ACK, NACK, and DTX, which are retransmission response signals of the first fundamental frequency block, are individually defined. On the other hand, the DTX which is the retransmission response signal of the second basic frequency block is not individually defined.

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