JP2011259125A - Radio communication system, base station device, mobile station device, radio communication method and integrated circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To encode and transmit an ACK/NACK efficiently when the ACK/NACK corresponding to a plurality of PDSCHs is transmitted on one PUSCH.SOLUTION: A mobile station device receives one or multiple PDSCHs on multiple downlink component carriers set to a base station device. The mobile station device generates an ACK/NACK depending on whether one or multiple pieces of downlink data in the PDSCHs are decoded successfully or not. The mobile station device serializes ACK/NACK bits, in an order the number of downlink component carrier is small, of the downlink data corresponding to the downlink component carriers set to the base station device. The mobile station device calculates the number of ACK/NACK modulation symbols used for the ACK/NACK to be transmitted on the PUSCH from the number of ACK/NACK bits or the like. The mobile station device inserts a coding bit of a predetermined value of x in a sequence of coding bits used for communication channel encoding. The mobile station device modulates coded uplink data and the ACK/NACK using the same modulation scheme, and then transmits them to the base station device.

Description

  The present invention relates to a radio communication system, a base station apparatus, a mobile station apparatus, a radio communication method, and an integrated circuit.

  The evolution of wireless access methods and wireless networks for cellular mobile communications (hereinafter referred to as “Long Term Evolution (LTE)” or “Evolved Universal Terrestrial Radio Access (EUTRA)”) is the third generation partnership project (3rd Generation Partnership Project: 3GPP). In LTE, an Orthogonal Frequency Division Multiplexing (OFDM) system, which is multicarrier transmission, is used as a wireless communication (downlink) communication system from a base station apparatus to a mobile station apparatus. Further, as a communication system for radio communication (uplink) from the mobile station apparatus to the base station apparatus, an SC-FDMA (Single-Carrier Frequency Division Multiple Access) system that is single carrier transmission is used.

  In LTE, an ACK (Acknowledgement) / NACKNACK (Negative Acknowledgement) indicating whether or not a mobile station apparatus has successfully decoded downlink data received on a physical downlink shared channel (PDCCH) is a physical uplink. It is transmitted using a link control channel (Physical Uplink Control Channel: PUCCH) or a physical uplink shared channel (Physical Uplink Shared Channel: PUSCH). When the mobile station apparatus is allocated PUSCH radio resources when transmitting ACK / NACK, it transmits ACK / NACK on PUSCH, and when it is not allocated PUSCH radio resources when transmitting ACK / NACK, PUCCH To transmit ACK / NACK.

  Wireless access method and wireless network (hereinafter referred to as “Long Term Evolution-Advanced (LTE-A)” or “Advanced Evolved Universal Terrestrial Radio”) that realizes higher-speed data communication using a frequency band wider than LTE. Access (A-EUTRA) ”) is under consideration for backward compatibility with LTE. That is, the LTE-A base station apparatus performs radio communication simultaneously with both LTE-A and LTE mobile station apparatuses, and the LTE-A mobile station apparatus performs radio communication with both the LTE-A and LTE base station apparatuses. LTE-A uses the same channel structure as LTE.

  In LTE-A, a plurality of frequency bands having the same channel structure as LTE (hereinafter referred to as “Carrier Component: CC” or “Component Carrier: CC”) are used. Techniques (frequency band aggregation: also referred to as spectrum aggregation, carrier aggregation, frequency aggregation, etc.) used as two frequency bands (broadband frequency bands) have been proposed. For example, in communication using frequency band aggregation, the base station apparatus arranges one PDSCH for each downlink component carrier, and simultaneously transmits a plurality of PDSCHs to the mobile station apparatus.

  In Non-Patent Document 1, when a mobile station apparatus simultaneously receives and transmits a plurality of ACK / NACK for each of a plurality of PDSCHs to a base station apparatus, one selected from a plurality of PUSCHs transmitted by the mobile station apparatus It is described that uplink data and a plurality of ACK / NACK are transmitted together using PUSCH.

  In the uplink of LTE-A, it has been discussed to use spatial multiplexing by MIMO SM (Multiple Input Multiple Output Spatial Multiplexing) for further throughput improvement from LTE. In other words, transmission in an information channel (uplink shared channel) (UL-SCH: Uplink Shared Channel) in an upper layer is realized with a spatial multiplexing number of 2 or more (hereinafter referred to as rank or Rank).

  On the other hand, for uplink control information that requires high quality such as ACK (ACKnowledgement) / NACK (Negative ACKnowledgement) and RI (Rank Indicator), the spatially multiplexed region (hereinafter referred to as layer or layer) It has been proposed to virtually realize rank 1 communication by duplicating the transmission sequence for all. That is, uplink data communication of rank 2 or higher and communication in which rank 1 ACK / NACK and RI transmission are mixed are performed. In this regard, Non-Patent Document 2 proposes assigning a bit string after channel coding to each layer as a method for creating a copy of control information.

"UCI Transmission in the Presence of UL-SCH Data", 3GPP TSG RAN WG1 Meeting # 61, R1-103067, May 10-14, 2010. "Performance evaluation of UCI multiplexing schemes on PUSCH in case of SU-MIMO", 3GPP TSG RAN WG1 Meeting # 61, R1-102962, May 10-14, 2010.

  However, in the conventional technology, when a base station apparatus and a mobile station apparatus perform radio communication using a plurality of component carriers, ACK / NACK for a plurality of PDSCHs received by a plurality of downlink component carriers is transmitted with one PUSCH. When transmitting, specific methods such as a method of encoding ACK / NACK and a method of determining the number of modulation symbols used for transmission of ACK / NACK are not disclosed.

  The present invention has been made in view of the above points, and an object of the present invention is to improve efficiency when a mobile station apparatus transmits ACK / NACK for a plurality of PDSCHs received by a plurality of downlink component carriers using one PUSCH. An object of the present invention is to provide a radio communication system, a base station apparatus, a mobile station apparatus, a radio communication method, and an integrated circuit that encode and transmit ACK / NACK.

  (1) In order to achieve the above object, the present invention takes the following measures. That is, the radio communication system of the present invention is a radio communication system in which a mobile station apparatus and a base station apparatus perform radio communication using a plurality of component carriers, and the mobile station apparatus receives a plurality of downlink component carriers. The first encoding is performed on the plurality of response information for the plurality of downlink data, and the second encoding is performed so that the modulation symbols of the response information subjected to the first encoding are arranged only in four signal points. The response information having been subjected to the second encoding and the uplink data having been subjected to the third encoding are modulated into modulation symbols having four or more signal points using the same modulation scheme, and the same physical uplink Transmission is performed using a shared channel, and the base station apparatus receives the physical uplink shared channel and performs a decoding process on the response information.

  (2) Further, according to the present invention, in the above wireless communication system, the mobile station apparatus transmits only one uplink data on the physical uplink shared channel or spatially multiplexes a plurality of the uplink data. Whether to perform the second encoding on the response information is determined depending on whether the response information is transmitted.

  (3) The radio communication system of the present invention is a radio communication system in which a mobile station apparatus and a base station apparatus perform radio communication using a plurality of component carriers, and the mobile station apparatus includes a plurality of downlink components. The number of modulation symbols used to transmit a plurality of response information for a plurality of downlink data received by a carrier is set to at least the number of bits of the response information, the number of bits of the uplink data, and the initial transmission of the physical uplink shared channel. Calculate using the amount of allocated radio resources, compare the calculated number of modulation symbols with a predetermined number of modulation symbols, and use the modulation symbol with the larger number of modulation symbols to send the response information to the physical uplink The base station apparatus receives the physical uplink shared channel and transmits the shared channel. It is characterized by performing the decoding process of the information.

  (4) The radio communication system of the present invention is a radio communication system in which a mobile station apparatus and a base station apparatus perform radio communication using a plurality of component carriers, and the mobile station apparatus includes a plurality of downlink components. The number of bits used for transmission of a plurality of response information for a plurality of downlink data received by a carrier is calculated from the number of downlink component carriers set in the base station apparatus, and the setting in which no downlink data is received The response information for the downlink component carrier is set to a predetermined value, the response information is encoded and modulated, and is transmitted on a physical uplink shared channel. A channel is received, and the response information is decoded.

  (5) Moreover, the mobile station apparatus of the present invention is a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of component carriers, and a plurality of downlink data received by a plurality of downlink component carriers. The first encoding is performed on a plurality of response information, the second encoding is performed so that the modulation symbols of the response information subjected to the first encoding are arranged only in four signal points, and the second encoding is performed. The encoded response information and the third encoded uplink data are modulated into modulation symbols having four or more signal points using the same modulation method, and transmitted on the same physical uplink shared channel. It is a feature.

  (6) Moreover, the mobile station apparatus of the present invention is a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of component carriers, and a plurality of downlink data received by a plurality of downlink component carriers. The number of modulation symbols used for transmitting a plurality of response information is determined using at least the number of bits of the response information, the number of bits of the uplink data, and the amount of radio resources allocated to the initial transmission of the physical uplink shared channel. Calculating, comparing the calculated number of modulation symbols with a predetermined number of modulation symbols, and transmitting the response information on the physical uplink shared channel using the modulation symbol having the larger number of modulation symbols. .

  (7) Moreover, the mobile station apparatus of the present invention is a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of component carriers, and a plurality of downlink data received by a plurality of downlink component carriers. The number of bits used for transmission of a plurality of response information is calculated from the number of downlink component carriers set in the base station apparatus, and the response information for the set downlink component carrier that has not received downlink data Is set to a predetermined value, the response information is encoded and modulated, and transmitted on the physical uplink shared channel.

  (8) Moreover, the base station apparatus of the present invention is a base station apparatus that performs radio communication with a mobile station apparatus using a plurality of component carriers, and the mobile station apparatus receives signals using a plurality of downlink component carriers. The first encoding is performed on a plurality of response information for a plurality of downlink data, and the second encoding is performed so that the modulation symbols of the response information subjected to the first encoding are arranged only in four signal points. The response information that has been subjected to the second encoding and the uplink data that has been subjected to the third encoding are modulated into modulation symbols having four or more signal points using the same modulation scheme, and are shared by the same physical uplink In this case, the base station apparatus receives the physical uplink shared channel and performs a decoding process on the response information.

  (9) Moreover, the radio communication method of the present invention is a radio communication method used for a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of component carriers, and is received by a plurality of downlink component carriers. Performing a first encoding on a plurality of response information for a plurality of downlink data, and a second code so that modulation symbols of the response information subjected to the first encoding are arranged only in four signal points And the second encoded response information and the third encoded uplink data are modulated into modulation symbols having four or more signal points using the same modulation scheme, and the same It has the step which transmits on a physical uplink shared channel, It is characterized by the above-mentioned.

  (10) The radio communication method of the present invention is a radio communication method used for a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of component carriers, and is received by a plurality of downlink component carriers. The number of modulation symbols used for transmission of a plurality of response information for a plurality of downlink data, at least the number of bits of the response information, the number of bits of the uplink data, and the radio allocated to the initial transmission of the physical uplink shared channel The step of calculating using the amount of resources, comparing the calculated number of modulation symbols with a predetermined number of modulation symbols, and using the modulation symbol with the larger number of modulation symbols, the response information for the physical uplink shared channel It is characterized by having the step which transmits by.

  (11) The radio communication method of the present invention is a radio communication method used for a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of component carriers, and is received by a plurality of downlink component carriers. Calculating the number of bits used to transmit a plurality of response information for a plurality of downlink data from the number of downlink component carriers set in the base station apparatus, and the setting that has not received downlink data It has the step which sets the said response information with respect to a downlink component carrier to a predetermined value.

  (12) A radio communication method of the present invention is a radio communication method used for a base station apparatus that performs radio communication with a mobile station apparatus using a plurality of component carriers, and the mobile station apparatus includes a plurality of downlink carriers. First encoding is performed on a plurality of response information for a plurality of downlink data received by a link component carrier, and modulation symbols of the response information subjected to the first encoding are arranged only at four signal points. The second encoding is performed, and the response information subjected to the second encoding and the uplink data subjected to the third encoding are modulated into modulation symbols having four or more signal points using the same modulation scheme. The base station apparatus includes a step of receiving the physical uplink shared channel and a step of decoding the response information. It is characterized in Rukoto.

  (13) An integrated circuit of the present invention is an integrated circuit used in a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of component carriers, and a plurality of components received by a plurality of downlink component carriers. Performing a first encoding on a plurality of response information for downlink data, and performing a second encoding so that modulation symbols of the response information subjected to the first encoding are arranged only in four signal points. Performing the second encoding, the response information having been subjected to the second encoding and the uplink data having been subjected to the third encoding are modulated into modulation symbols having four or more signal points using the same modulation scheme, and the same physical uplink It has the step which transmits on a link shared channel.

  (14) An integrated circuit of the present invention is an integrated circuit used in a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of component carriers, and a plurality of components received by a plurality of downlink component carriers. The number of modulation symbols used for transmission of a plurality of response information for downlink data is at least the number of bits of the response information, the number of bits of the uplink data, and the radio resources allocated to the initial transmission of the physical uplink shared channel A step of calculating using a quantity, and comparing the calculated number of modulation symbols with a predetermined number of modulation symbols, and transmitting the response information on a physical uplink shared channel using a modulation symbol having a larger number of modulation symbols It has the step to perform.

  (15) An integrated circuit of the present invention is an integrated circuit used in a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of component carriers, and a plurality of components received by a plurality of downlink component carriers. Calculating the number of bits used to transmit a plurality of response information for downlink data from the number of downlink component carriers set in the base station apparatus, and the set downlink that has not received downlink data It has the step which sets the said response information with respect to a component carrier to a predetermined value, It is characterized by the above-mentioned.

  (16) The integrated circuit of the present invention is a radio communication method used in a base station apparatus that performs radio communication with a mobile station apparatus using a plurality of component carriers, and the mobile station apparatus includes a plurality of downlinks. First encoding is performed on a plurality of response information for a plurality of downlink data received by a component carrier, and the modulation symbols of the response information subjected to the first encoding are arranged in only four signal points. 2, the response information subjected to the second encoding and the uplink data subjected to the third encoding are modulated into modulation symbols having four or more signal points using the same modulation scheme, Transmitting on the same physical uplink shared channel, and the integrated circuit includes a step of receiving the physical uplink shared channel and a step of decoding the response information. It is characterized in.

  According to the present invention, when an ACK / NACK for a plurality of PDSCHs received by a plurality of downlink component carriers is transmitted by one PUSCH, the mobile station apparatus can efficiently encode and transmit the ACK / NACK. .

It is a conceptual diagram of the radio | wireless communications system of this invention. It is a figure which shows an example of the frequency band aggregation process of this invention. It is the schematic which shows an example of a structure of the downlink radio frame of this invention. It is the schematic which shows an example of a structure of the uplink radio frame of this invention. It is a figure explaining the method of transmitting uplink data and uplink control information simultaneously with PUSCH of this invention. It is a flowchart figure which shows an example of operation | movement of the mobile station apparatus 1 of this invention. It is a schematic block diagram which shows the structure of the mobile station apparatus 1 of this invention. It is a schematic block diagram which shows the structure of the base station apparatus 3 of this invention. It is a figure.

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

  First, the physical channel of the present invention will be described.

  FIG. 1 is a conceptual diagram of a wireless communication system of the present invention. In FIG. 1, the radio communication system includes mobile station apparatuses 1 </ b> A to 1 </ b> C and a base station apparatus 3. FIG. 1 shows, in radio communication (downlink) from the base station apparatus 3 to the mobile station apparatuses 1A to 1C, a synchronization signal (Synchronization signal: SS), a downlink reference signal (Downlink Reference Signal: DL RS), and a physical broadcast channel (Physical Broadcast Channel: PBCH), Physical Downlink Control Channel (PDCCH), Physical Downlink Shared Channel (PDSCH), Physical Multicast Channel (PMCH), Physical Control Format This indicates that an indicator channel (Physical Control Format Indicator Channel: PCFICH) and a physical HARQ indicator channel (Physical Hybrid ARQ Indicator Channel: PHICH) are allocated.

  FIG. 1 shows an uplink reference signal (UL RS) and a physical uplink control channel (PUCCH) in radio communication (uplink) from the mobile station apparatuses 1A to 1C to the base station apparatus 3. ), A physical uplink shared channel (PUSCH), and a physical random access channel (PRACH). Hereinafter, the mobile station apparatuses 1A to 1C are referred to as the mobile station apparatus 1.

  The synchronization signal is a signal used for the mobile station apparatus 1 to synchronize the downlink frequency domain and time domain. The downlink reference signal is used by the mobile station apparatus 1 to synchronize the downlink frequency domain and time domain, the mobile station apparatus 1 is used to measure downlink reception quality, or the mobile station This is a signal used by the device 1 to perform PDSCH or PDCCH propagation path correction.

  The PBCH is a physical channel used for broadcasting control parameters (system information) (Broadcast Channel: BCH) commonly used in the mobile station apparatus 1. PBCH is transmitted at intervals of 40 ms. The mobile station apparatus 1 performs blind detection at 40 ms intervals.

  The PDCCH is a physical channel used for transmitting downlink control information (Downlink Control Information: DCI) such as downlink assignment (also referred to as downlink assignment or downlink grant) and uplink grant (uplink grant). . The downlink assignment is composed of information (Modulation and Coding Scheme: MCS) on the modulation scheme and coding rate for PDSCH, information indicating radio resource allocation, and the like. The uplink grant is composed of information on the modulation scheme and coding rate for PUSCH, information indicating radio resource allocation, and the like.

  A plurality of formats are used for the downlink control information. The format of the downlink control information is called a DCI format (DCI format). The DCI format of the downlink assignment is a DCI format 1A used when the base station apparatus 3 transmits PDSCH using one transmission antenna port or transmission diversity, and the base station apparatus 3 uses MIMO SM (Multiple Input Multiplex) for PDSCH. A DCI format 2 used when transmitting a plurality of downlink data using Output Spatial Multiplexing is prepared.

  MIMO SM is a technique in which a plurality of signals are multiplexed and transmitted / received on a plurality of spatial dimension channels realized by a plurality of transmission antenna ports and a plurality of reception antenna ports. Here, the antenna port indicates a logical antenna used for signal processing, and one antenna port may be configured by one physical antenna or may be configured by a plurality of physical antennas. Also good. On the transmission side using MIMO SM, a process (referred to as precoding) for forming an appropriate spatial channel is performed for a plurality of signals, and the plurality of signals subjected to the precoding process are processed. Are transmitted using a plurality of transmission antennas. On the receiving side using MIMO SM, processing for appropriately separating signals multiplexed on a spatial dimension channel is performed on a plurality of signals received using a plurality of receiving antennas.

  PDSCH is a physical channel that is not broadcast on paging information (Paging Channel: PCH) or PBCH, that is, used to transmit system information other than BCH and downlink data (Downlink Shared Channel: DL-SCH). The PMCH is a physical channel used for transmitting information (Multicast Channel: MCH) related to MBMS (Multimedia Broadcast and Multicast Service).

  PCFICH is a physical channel used for transmitting information indicating an area where a PDCCH is arranged. The PHICH is a physical channel used for transmitting a HARQ indicator indicating success or failure of decoding of uplink data received by the base station apparatus 3.

  When the base station apparatus 3 successfully decodes all the uplink data included in the PUSCH, the HARQ indicator indicates ACK (ACKnowledgement), and the base station apparatus 3 decodes at least one uplink data included in the PUSCH. In case of failure, the HARQ indicator indicates NACK (Negative ACKnowledgement). A configuration in which a plurality of HARQ indicators indicating success or failure of decoding for each of a plurality of uplink data included in the same PUSCH may be transmitted by a plurality of PHICHs may be used.

  The uplink reference signal is used for the base station device 3 to synchronize the uplink time domain, the base station device 3 is used to measure uplink reception quality, or the base station device 3 It is a signal used to perform propagation channel correction for PUSCH and PUCCH. The uplink reference signal is subjected to code spreading using a CAZAC (Constant Amplitude and Zero Auto-Correlation) sequence in a radio resource divided assuming SC-FDMA.

  The CAZAC sequence is a sequence having a constant amplitude and excellent autocorrelation characteristics in the time domain and the frequency domain. Since the amplitude is constant in the time domain, the PAPR (Peak to Average Power Ratio) can be kept low. A cyclic delay is applied to the DMRS in the time domain. This cyclic delay in the time domain is called a cyclic shift. The cyclic shift corresponds to the phase rotation of the CAZAC sequence in sub-carrier units in the frequency domain.

  In the uplink reference signal, a DMRS (Demodulation Reference Signal) that is time-multiplexed with PUSCH or PUCCH and used for channel compensation of PUSCH and PUCCH, and base station apparatus 3 that is transmitted independently of PUSCH and PUCCH. There is an SRS (Sounding Reference Signal) used to estimate the state of the uplink propagation path. In DMRS, not only cyclic shift but also OCC (Orthogonal Cover Code) is used.

  The PUCCH includes channel quality information indicating downlink channel quality, a scheduling request (SR) indicating a request for uplink radio resource allocation, and downlink data received by the mobile station apparatus 1. This is a physical channel used for transmitting uplink control information (UCI) that is information used for communication control, such as ACK / NACK indicating success or failure of decoding.

  The channel quality information includes a channel quality indicator (CQI), a rank indicator (Rank Indicator: RI), and a precoding matrix indicator (Premier Matrix Indicator: PMI). The CQI is information indicating channel quality for changing radio transmission parameters such as an error correction scheme of a downlink physical channel, an error correction coding rate, and a data modulation multi-level number.

  The RI is a signal sequence unit (stream) that pre-processes a transmission signal sequence that the mobile station apparatus 1 requests the base station apparatus 3 in advance when a plurality of downlink data is spatially multiplexed and transmitted in the MIMO SM scheme in the downlink. ) Is information (Rank). The PMI is precoding information for preprocessing a transmission signal sequence that the mobile station apparatus 1 requests the base station apparatus 3 when performing spatial multiplexing transmission in the MIMO SM scheme.

  PUSCH is a physical channel used for transmitting uplink data and uplink control information. PRACH is a physical channel used for transmitting a random access preamble. The PRACH is mainly used for the mobile station apparatus 1 to synchronize with the base station apparatus 3 in the time domain, and is also used for initial access, handover, reconnection request, and uplink radio resource allocation request. It is done.

  Hereinafter, frequency band aggregation of the present invention will be described.

  FIG. 2 is a diagram illustrating an example of the frequency band aggregation processing according to the present invention. In FIG. 2, the horizontal axis represents the frequency domain, and the vertical axis represents the time domain. As shown in FIG. 2, the downlink subframe D1 includes four downlink component carriers (DL CC-1; Downlink Component Carrier-1, DL CC-2, DL CC-3, DL CC-1) having a bandwidth of 20 MHz. DL CC-4) subframes.

  Each subframe of the downlink component carrier includes a region where PHICH, PCFICH, and PDCCH indicated by a hatched region and a region where PDSCH indicated by a dot-hatched region is provided. . PHICH, PCFICH, and PDCCH are frequency multiplexed and / or time multiplexed. The region where PHICH, PCFICH and PDCCH are frequency multiplexed and / or time multiplexed and the region where PDSCH is arranged are time multiplexed.

  The uplink subframe U1 is composed of three uplink component carriers (UL CC-1; Uplink Component Carrier-1, UL CC-2, UL CC-3) having a bandwidth of 20 MHz. In each subframe of the uplink component carrier, a region where a PUCCH indicated by a gray hatched region and a region where a PUSCH indicated by a horizontal hatched region is arranged are frequency-multiplexed. .

  First, the mobile station apparatus 1 performs initial access to the base station apparatus 3 using any one set of downlink component carrier and uplink component carrier. The base station apparatus 3 uses the RRC signal (Radio Resource Control signal) transmitted using the PDSCH of the downlink component carrier to which the mobile station apparatus 1 has made initial access to set the downlink component carrier set for the mobile station apparatus 1. And uplink component carrier (hereinafter referred to as “configured component carrier”).

  The base station apparatus 3 selects a downlink component carrier used for downlink communication from among the set downlink component carriers and / or an uplink component carrier used for uplink communication from among the set uplink component carriers. The activation command shown is notified using PDCCH or MAC (Medium Access Control) CE (Control Element).

  Informing the mobile station device 1 that the component carrier is used for communication by the activation command by the base station device 3 is referred to as activating the component carrier. Informing the mobile station device 1 that the component carrier is not used for communication by the activation command is referred to as deactivating the component carrier.

  The base station apparatus 3 moves a downlink primary component carrier (DL PCC) and an uplink component carrier (UL PCC) from among the configured downlink component carrier and uplink component carrier. Set for each station apparatus 1 and notify the mobile station apparatus 1 of an RRC signal including information related to this setting.

  The primary component carrier is never deactivated. The uplink control information is transmitted on the PUCCH of the uplink primary component carrier and / or the PUSCH of any one of the configured uplink component carriers.

  Hereinafter, the configuration of the radio frame of the present invention will be described.

  FIG. 3 is a schematic diagram illustrating an example of a configuration of a downlink radio frame according to the present invention. In FIG. 3, the horizontal axis is the time domain, and the vertical axis is the frequency domain. As shown in FIG. 3, the downlink radio frame is composed of a plurality of downlink physical resource block (PRB) pairs (for example, an area surrounded by a broken line in FIG. 3). This downlink physical resource block pair is a unit such as radio resource allocation, and has a predetermined frequency band (PRB bandwidth; 180 kHz) and time band (2 slots = 1 subframe; 1 ms).

  One downlink physical resource block pair is composed of two downlink physical resource blocks (PRB bandwidth × slot) that are continuous in the time domain. One downlink physical resource block (unit surrounded by a thick line in FIG. 3) is composed of 12 subcarriers (15 kHz) in the frequency domain, and 7 OFDM (Orthogonal Frequency Division) in the time domain. Multiplexing) symbol (71 μs).

  In the time domain, a slot composed of 7 OFDM symbols (71 μs) (0.5 ms), a subframe composed of 2 slots (1 ms), and a radio frame composed of 10 subframes ( 10 ms). 1 ms, which is the same time interval as the subframe, is also referred to as a transmission time interval (TTI). In the frequency domain, a plurality of downlink physical resource blocks are arranged according to the bandwidth of the downlink component carrier. A unit composed of one subcarrier and one OFDM symbol is referred to as a downlink resource element.

  Hereinafter, the arrangement of physical channels allocated to the downlink will be described. In each downlink subframe, PDCCH, PCFICH, PHICH, PDSCH, a downlink reference signal, and the like are arranged. PDCCH is arranged from the OFDM symbol at the head of the subframe (the area hatched with a left oblique line in FIG. 3). The number of OFDM symbols in which the PDCCH is arranged is different for each subframe, and information indicating the number of OFDM symbols in which the PDCCH is arranged is broadcast by PCFICH. In each subframe, a plurality of PDCCHs are frequency multiplexed and time multiplexed.

  PCFICH is arranged in the first OFDM symbol of the subframe and is frequency-multiplexed with PDCCH. The PHICH is frequency-multiplexed within the same OFDM symbol as the PDCCH (the area hatched with grid lines in FIG. 3). The PHICH may be arranged only in the first OFDM symbol of the subframe, or may be arranged dispersed in a plurality of OFDM symbols in which the PDCCH is arranged. In each subframe, a plurality of PHICHs are frequency multiplexed and code multiplexed.

  The mobile station apparatus 1 receives HARQ feedback for this PUSCH in a downlink subframe PHICH after a predetermined time (for example, 4 ms later, 4 subframes later, 4 TTIs) after transmitting the PUSCH.

  The PDSCH is arranged in an OFDM symbol other than the OFDM symbol in which the PDCCH, PCFICH, and PHICH in the subframe are arranged (in FIG. 3, a region that is not hatched). PDSCH radio resource allocation is indicated to the mobile station apparatus 1 using downlink assignment. The radio resources of the PDSCH are arranged in the same downlink subframe as that of the PDCCH including the downlink assignment indicating the PDSCH assignment in the time domain.

  PDSCH and PDCCH for this PDSCH are arranged on the same or different downlink component carriers. In a subframe of each downlink component carrier, a plurality of PDSCHs are frequency-multiplexed and spatially multiplexed. The downlink reference signal is not shown in FIG. 3 for simplicity of explanation, but the downlink reference signal is distributed and arranged in the frequency domain and the time domain.

  FIG. 4 is a schematic diagram illustrating an example of a configuration of an uplink radio frame according to the present invention. In FIG. 3, the horizontal axis is the time domain, and the vertical axis is the frequency domain. As shown in FIG. 4, the uplink radio frame is composed of a plurality of uplink physical resource block pairs (for example, an area surrounded by a broken line in FIG. 4). This uplink physical resource block pair is a unit such as radio resource allocation, and has a predetermined frequency band (PRB bandwidth; 180 kHz) and time band (2 slots = 1 subframe; 1 ms).

  One uplink physical resource block pair is composed of two uplink physical resource blocks (PRB bandwidth × slot) that are continuous in the time domain. One uplink physical resource block (unit surrounded by a thick line in FIG. 3) is composed of 12 subcarriers in the frequency domain, and is composed of 7 SC-FDMA symbols (71 μs) in the time domain. Composed.

  In the time domain, a slot (0.5 ms) composed of seven SC-FDMA (Single-Carrier Frequency Division Multiple Access) symbols (71 μs), a subframe (1 ms) composed of two slots, 10 There is a radio frame (10 ms) composed of subframes. 1 ms, which is the same time interval as the subframe, is also referred to as a transmission time interval (TTI). In the frequency domain, a plurality of uplink physical resource blocks are arranged according to the bandwidth of the uplink component carrier. A unit composed of one subcarrier and one SC-FDMA symbol is referred to as an uplink resource element.

  Hereinafter, physical channels allocated in the uplink radio frame will be described. PUCCH, PUSCH, PRACH, an uplink reference signal, etc. are arrange | positioned at each sub-frame of an uplink. The PUCCH is arranged in uplink physical resource blocks (regions hatched with left diagonal lines) at both ends of the uplink band. In each subframe, a plurality of PUCCHs are frequency multiplexed and code multiplexed.

  The PUSCH is arranged in an uplink physical resource block pair (an area that is not hatched) other than the uplink physical resource block in which the PUCCH is arranged. PUSCH radio resources are allocated using an uplink grant, and after a predetermined time from a downlink subframe in which a PDCCH including the uplink grant is arranged (for example, 4 ms later, 4 subframes later, 4 TTI later) Are arranged in uplink subframes. In each subframe, a plurality of PUSCHs are frequency multiplexed and spatially multiplexed.

  Information indicating a subframe in which the PRACH is arranged and an uplink physical resource block is broadcast by the base station apparatus. The uplink reference signal is time-multiplexed with PUCCH and PUSCH. For example, DMRS time-multiplexed with PUSCH is arranged in the fourth and eleventh SC-FDMA symbols in the subframe.

  The uplink reference signal is time-multiplexed with PUSCH and PUCCH and transmitted. When the PUSCH and the uplink reference signal are time-multiplexed, the uplink reference signal is arranged in the same frequency band to which the PUSCH is allocated in the frequency domain, and the fourth and eleventh SC-FDMA symbols in the time domain. Be placed.

  Hereinafter, the arrangement of uplink data and uplink control information in the PUSCH of the present invention will be described.

  FIG. 5 is a diagram for explaining a method of simultaneously transmitting uplink data and uplink control information using the PUSCH of the present invention. In FIG. 5, the horizontal axis represents the time domain, and the vertical axis represents the arrangement of modulation symbol sequences to be mapped, and does not correspond to the frequency axis, but is subjected to DFT processing for each SC-FDMA symbol, It is mapped to the resource allocated in.

  Specifically, when focusing on the second SC-FDMA symbol, ACK / NACK, uplink data, and CQI / PMI modulation symbols are time-multiplexed, converted into frequency domain signals by DFT processing, and then uplink grants. It shows that it is arranged in the allocated frequency band.

  ACK / NACK modulation symbols are arranged in the third, fifth, tenth and twelfth SC-FDMA symbols. RI modulation symbols are arranged in the second, sixth, ninth and thirteenth SC-FDMA symbols. In CQI / PMI and uplink data, modulation symbols are first arranged in order from the smallest SC-FDMA symbol number to the largest. Note that uplink data, ACK / NACK, CQI / PMI, and RI are individually encoded with the same or different encoding, modulated by a common modulation scheme, and the modulation symbols are rearranged as shown in FIG.

  It should be noted that the modulated ACK / NACK, uplink data, and other bits divided into the number of bits of the modulation multilevel number may be regarded as modulation symbols and rearranged as shown in FIG.

  Hereinafter, a method for calculating the number of ACK / NACK bits according to the present invention will be described.

  In the present invention, the number of ACK / NACK bits used when transmitting ACK / NACK on the PUSCH includes the number of downlink component carriers in which the mobile station apparatus 1 is set in the base station apparatus 3 and one PDSCH. It is a value obtained by multiplying the maximum number of downlink data that can be multiplexed. When three downlink component carriers are set and up to two downlink data can be spatially multiplexed on one PDSCH, the mobile station apparatus 1 generates 6-bit ACK / NACK. That is, one bit of ACK / NACK is generated for each downlink data received by the downlink component carrier.

  Note that the number of ACK / NACK bits may be a value obtained by multiplying the number of activated downlink component carriers by the maximum number of downlink data that can be spatially multiplexed on one PDSCH. Thereby, it is possible to reduce the number of ACK / NACK bits and the number of modulation symbols of ACK / NACK for a deactivated downlink component carrier in which no downlink data is transmitted.

  If the PDSCH is received only in a part of the configured downlink component carrier, the ACK / NACK bit for the configured downlink component that has not received the PDSCH is set to a predetermined value. . In addition, when only one downlink data is received on the PDSCH received by the configured downlink component carrier, only 1-bit ACK / NACK is generated for the configured downlink component carrier. 1-bit ACK / NACK is set to a predetermined value.

  For example, the mobile station device 1 successfully decodes two downlink data received by the first configured downlink component carrier among the three configured downlink component carriers, and the second configured downlink component carrier When the downlink component data is not received by the link component carrier and decoding of one downlink data received by the third configured downlink component carrier fails, the mobile station apparatus 1 uses 6 bits of “11yy0y”. ACK / NACK sequence is generated.

  In the case of ACK, the bit value is set to 1, and in the case of NACK, the bit value is set to 0. If no downlink data is received, the bit value is set to y (y is a predetermined value of 0 or 1). Thus, when the mobile station apparatus 1 does not receive the downlink data, the base station apparatus 3 transmits the downlink data to the mobile station apparatus 1 by setting the ACK / NACK bit to a predetermined value. Since it can be seen that the ACK / NACK for the downlink component carrier that has not been set is set to a predetermined value, the ACK / NACK reception accuracy for the downlink data transmitted to the remaining mobile station apparatus 1 is improved.

  By determining the order in which the mobile station apparatus 1 arranges the ACK / NACK bits, the base station apparatus 3 correctly determines which downlink component carrier the ACK / NACK bits are for the downlink data transmitted. Can be recognized.

  For example, the base station device 3 sets a downlink component carrier number when setting a downlink component carrier in the mobile station device 1, and notifies the mobile station device 1 of the number. The mobile station apparatus 1 arranges bits in ACK / NACK in order from the smallest downlink component carrier number set in the base station apparatus 3.

  Alternatively, the mobile station device 1 may first arrange ACK / NACK for downlink data received by the downlink primary component carrier, and then arrange ACK / NACK for downlink data received by other than the downlink primary component carrier.

  Hereinafter, an ACK / NACK encoding method of the present invention will be described.

  First, ACK / NACK is channel-coded using a Reed-Muller code or the like, and ACK / NACK coded bits are generated. Next, encoded bits having a predetermined value are inserted every two generated encoded bits. The number of encoded bits having a predetermined value to be inserted is determined by the PUSCH modulation scheme.

  When PUSCH is modulated by 16QAM (Quadrature Amplitude Modulation), two encoded bits having a predetermined value are inserted every two generated encoded bits. When PUSCH is modulated by 64QAM, four encoded bits having a predetermined value are inserted every two generated encoded bits.

  As a result, regardless of the PUSCH modulation scheme, the ACK / NACK modulation symbol includes only a 2-bit information amount, and the number of ACK / NACK modulation symbol signal points is limited to four. Also, the encoded bits and the signal points are associated with each other so that these four signal points become the four signal points having the maximum 16QAM or 64QAM amplitude.

  For example, when PUSCH is modulated by 16QAM, if the sequence of ACK / NACK encoded bits is “00100111”, encoded bits of a predetermined value (x) are inserted into this sequence and “00xx10xx01xx11xx”. (X is a predetermined value of 0 or 1). In addition, “00xx”, “01xx”, “10xx”, and “11xx” are associated with four signal points with the maximum 16QAM amplitude. Accordingly, even if the mobile station apparatus 1 modulates the ACK / NACK encoded bits with 16QAM or 64QAM, the base station apparatus 3 can handle the modulation symbol of ACK / NACK as QPSK. Hereinafter, this method is referred to as virtual QPSK.

  Hereinafter, a method for calculating the number of ACK / NACK modulation symbols according to the present invention will be described.

  In the present invention, the number of ACK / NACK modulation symbols used when transmitting ACK / NACK on the PUSCH includes the number of ACK / NACK bits transmitted on the PUSCH, the coding rate at the initial transmission of uplink data, It is obtained from the offset set by the station device 3. Expression (1) is an expression for calculating the number of ACK / NACK modulation symbols used when transmitting ACK / NACK on PUSCH.

  O is the number of bits of the ACK / NACK bit sequence generated by the mobile station apparatus 1 of the present invention. That is, O is a value obtained by multiplying the number of downlink component carriers in which the mobile station apparatus 1 is set in the base station apparatus 3 and the maximum number of downlink data that can be spatially multiplexed on one PDSCH. Thereby, since it is not necessary to calculate O for each subframe according to the number of downlink data actually scheduled, the configuration of the mobile station apparatus 1 can be simplified.

  Note that O may be a value obtained by multiplying the number of activated downlink component carriers by the maximum number of downlink data that can be spatially multiplexed on one PDSCH, or may be the number of downlink data received by the mobile station apparatus 1. Good.

  As a result, the number of modulation symbols for ACK / NACK is reduced and the reception accuracy of ACK / NACK is deteriorated, but the base station device 3 does not transmit downlink data to the mobile station device 1 but ACK / NACK for downlink component carriers. Is set to a predetermined value, and the ACK / NACK reception accuracy for the downlink data transmitted to the remaining mobile station apparatus 1 is improved. Compared with the case where downlink data is transmitted by the downlink component carrier that has been transmitted, it is suppressed to the same extent. However, since it is necessary to calculate O for each subframe, the configuration of the mobile station apparatus 1 becomes complicated.

  As shown in FIG. 5, since the ACK / NACK modulation symbols are arranged only in four SC-FDMA symbols, the maximum number of ACK / NACK modulation symbols that can be arranged is in the frequency band allocated to PUSCH. This is four times the number of subcarriers included. When Q ″ is larger than the number of modulation symbols necessary for transmitting the ACK / NACK encoded bits, the Q ″ is repeatedly arranged from the head part of the ACK / NACK modulation symbols (encoded bits).

  In the present invention, since only 2 bits can be transmitted with one modulation symbol, when a Reed-Muller code having an output of 32 bits is used for encoding ACK / NACK, in order to transmit all encoded bits of ACK / NACK, Requires a minimum of 16 modulation symbols. However, when Q ″ calculated by the equation (1) is smaller than 16, it is not possible to transmit all the encoded bits of ACK / NACK, and the base station apparatus 3 ACKs from an incompletely encoded bit sequence. / NACK has to be estimated, and there is a problem that the estimation accuracy of ACK / NACK deteriorates.

  Therefore, in the present invention, a lower limit is set for the number of modulation symbols used for ACK / NACK transmitted by PUSCH. When Q ″ is smaller than the lower limit, the mobile station apparatus 1 sets the number of ACK / NACK modulation symbols transmitted on the PUSCH as a lower limit value. The lower limit value indicates the number of encoded ACK / NACK bits. The value is preferably divided by the number of bits that can be transmitted in one modulation symbol, but may be larger or smaller.

  Whether or not to perform virtual QPSK after channel coding of ACK / NACK depending on whether PUSCH is transmitted using one transmission antenna port or using MIMO SM with a plurality of transmission antenna ports. You may switch.

  When PUSCH is transmitted by MIMO SM, a sequence of ACK / NACK duplicated for each layer is arranged. On the other hand, since a different modulation scheme is used for each spatially multiplexed uplink data, a different modulation scheme is applied for each replicated ACK / NACK sequence. By using virtual QPSK, ACK / NACK is uplinked. The same virtual QPSK modulation is applied even if the modulation method of each data is different. When PUSCH is transmitted by one transmission antenna port, since one modulation scheme is applied to one uplink data, virtual QPSK may not be applied.

  On the other hand, when the PUSCH is transmitted by MIMO SM, the base station apparatus 3 instructs the mobile station apparatus 1 with an uplink grant to transmit uplink data at a high coding rate because the communication path is good. To do. By transmitting uplink data at a high coding rate, the number of modulation symbols for ACK / NACK is reduced. By applying virtual QPSK, the number of coded bits that can be transmitted with one modulation symbol is reduced. Therefore, when virtual QPSK is applied when the situation of the communication channel is good and MIMO SM is applied, ACK Only a part of the encoded bit sequence of / NACK can be transmitted, and the ACK / NACK cannot be accurately decoded by the base station apparatus 3.

  Therefore, virtual QPSK is not applied to ACK / NACK when transmitting PUSCH using MIMO SM, and virtual QPSK is applied to ACK / NACK when transmitting PUSCH using one transmission antenna port. It may be.

  Hereinafter, the operation of the apparatus of the present invention will be described.

  FIG. 6 is a flowchart showing an example of the operation of the mobile station apparatus 1 of the present invention. The mobile station apparatus 1 receives one or a plurality of PDSCHs with a plurality of downlink component carriers set in the base station apparatus 3 (step S100). The mobile station apparatus 1 generates ACK / NACK according to success or failure of decoding one or more downlink data included in the PDSCH (step S101). In addition, when PDSCH is not received by a downlink component carrier, or when only one downlink data is received by one PDSCH, ACK / NACK for downlink data that has not been received is a predetermined value. Set to y.

  The mobile station apparatus 1 arranges in order from the ACK / NACK bits of the downlink data corresponding to the downlink component carrier having a smaller number set in the base station apparatus 3 (step S102). The mobile station apparatus 1 calculates the number of ACK / NACK modulation symbols used for ACK / NACK transmitted on the PUSCH from the number of ACK / NACK bits (step S103). When the calculated number of modulation symbols exceeds the upper limit, the number of ACK / NACK modulation symbols is set to the upper limit value, and when the calculated number of modulation symbols is below the lower limit, ACK / NACK is set. Is set to the lower limit value.

  The mobile station apparatus 1 performs channel coding on the ACK / NACK bits rearranged in step S102, and sets a predetermined value x every two bits to the coded bit sequence obtained by channel coding. Encoded bits are inserted (step S104). Note that the number of encoded bits having a predetermined value x depends on the PUSCH modulation scheme.

  The mobile station apparatus 1 modulates the encoded uplink data and ACK / NACK with the same modulation method, rearranges them as shown in FIG. 5, generates SC-FDMA symbols, and transmits them to the base station apparatus 3 (step S105). ). After step S105, the mobile station apparatus 1 ends the processing related to transmission of ACK / NACK on PUSCH.

  The apparatus configuration of the present invention will be described below.

  FIG. 7 is a schematic block diagram showing the configuration of the mobile station apparatus 1 of the present invention. As illustrated, the mobile station apparatus 1 includes an upper layer processing unit 101, a control unit 103, a receiving unit 105, a transmitting unit 107, and a transmission / reception antenna 109. The upper layer processing unit 101 includes a radio resource control unit 1011, a HARQ control unit 1013, and an ACK / NACK control unit 1015. The reception unit 105 includes a decoding unit 1051, a demodulation unit 1053, a demultiplexing unit 1055, a radio reception unit 1057, and a channel measurement unit 1059. The transmission unit 107 includes an encoding unit 1071, a modulation unit 1073, a multiplexing unit 1075, a radio transmission unit 1077, and an uplink reference signal generation unit 1079.

  Upper layer processing section 101 outputs uplink data generated by a user operation or the like to transmitting section 107. The upper layer processing unit 101 includes a medium access control (MAC) layer, a packet data integration protocol (PDCP) layer, a radio link control (Radio Link Control: RLC) layer, and radio resource control. Process the (Radio Resource Control: RRC) layer. Further, upper layer processing section 101 generates control information for controlling receiving section 105 and transmitting section 107 based on downlink control information received by PDCCH, and outputs the control information to control section 103.

  The radio resource control unit 1011 included in the higher layer processing unit 101 manages various setting information of the own device. For example, the radio resource control unit 1011 manages RNTI such as C-RNTI and set component carriers. Also, the radio resource control unit 1011 generates information arranged in each uplink channel and outputs the information to the transmission unit 107.

  The HARQ control unit 1013 included in the higher layer processing unit 101 performs HARQ control of downlink data. When the received downlink data is successfully decoded, the HARQ control unit 1013 instructs the ACK / NACK control unit to transmit an ACK to the base station apparatus 3, and when the received downlink data fails to be decoded. The ACK / NACK control unit is instructed to transmit the NACK to the base station apparatus 3.

  The HARQ control unit 1013 holds the downlink data in the HARQ buffer when the decoding of the downlink data fails, and the retransmission is performed when the downlink data retransmitted by the base station device 3 is received. Decoding processing is performed by combining the downlink data and the downlink data held in the HARQ buffer.

  The ACK / NACK control unit 1015 included in the higher layer processing unit 101 generates ACK or NACK according to an instruction from the HARQ control unit 1013, and rearranges ACK / NACK bits. The ACK / NACK control unit 1015 sets the value of the ACK / NACK bit to a predetermined value y when the downlink data corresponding to the ACK / NACK bit is not received.

  The ACK / NACK control unit 1015 calculates the number of ACK / NACK modulation symbols when transmitting ACK / NACK on the PUSCH, generates an ACK / NACK modulation symbol with the calculated number of modulation symbols, and sets the PUSCH modulation scheme. Accordingly, control information for controlling the transmitting unit 107 to insert a coded bit of a predetermined value x into a coded bit of ACK / NACK and transmit both ACK / NACK and uplink data by PUSCH. Is output to the control unit 103.

  The control unit 103 generates a control signal for controlling the reception unit 105 and the transmission unit 107 based on the control information from the higher layer processing unit 101. Control unit 103 outputs the generated control signal to receiving unit 105 and transmitting unit 107 to control receiving unit 105 and transmitting unit 107. The receiving unit 105 separates, demodulates, and decodes the received signal received from the base station apparatus 3 via the transmission / reception antenna 109 according to the control signal input from the control unit 103, and sends the decoded information to the upper layer processing unit 101. Output.

  The radio reception unit 1057 converts the downlink signal received via the transmission / reception antenna 109 to an intermediate frequency (down covert), removes unnecessary frequency components, and maintains the signal level appropriately. Then, the amplification level is controlled, quadrature demodulation is performed based on the in-phase component and the quadrature component of the received signal, and the quadrature demodulated analog signal is converted into a digital signal. The radio reception unit 1057 removes a portion corresponding to a guard interval (GI) from the converted digital signal, performs a fast Fourier transform (FFT) on the signal from which the guard interval has been removed, and performs frequency conversion. Extract the region signal.

  The demultiplexing unit 1055 separates the extracted signal into PHICH, PDCCH, PDSCH, and downlink reference signal. This separation is performed based on the radio resource allocation information notified by the downlink assignment. Further, demultiplexing section 1055 compensates the propagation path of PHICH, PDCCH, and PDSCH from the estimated propagation path value input from channel measurement section 1059. Also, the demultiplexing unit 1055 outputs the demultiplexed downlink reference signal to the channel measurement unit 1059.

  Demodulation section 1053 multiplies the PHICH by a corresponding code and synthesizes, demodulates the synthesized signal using a BPSK (Binary Phase Shift Keying) modulation method, and outputs the result to decoding section 1051. Decoding section 1051 decodes the PHICH addressed to the own apparatus, and outputs the decoded HARQ indicator to higher layer processing section 101. Demodulation section 1053 demodulates the QPSK modulation scheme for PDCCH and outputs the result to decoding section 1051. Decoding section 1051 attempts blind decoding of PDCCH, and when blind decoding is successful, decodes downlink control information and outputs RNTI included in downlink control information to higher layer processing section 101.

  Demodulation section 1053 demodulates the modulation scheme notified by downlink assignment such as QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, etc., to PDSCH and outputs the result to decoding section 1051. . The decoding unit 1051 performs decoding based on the information regarding the coding rate notified by the downlink control information, and outputs the decoded downlink data (transport block) to the higher layer processing unit 101.

  Channel measurement section 1059 measures the downlink path loss and channel state from the downlink reference signal input from demultiplexing section 1055, and outputs the measured path loss and channel state to higher layer processing section 101. Also, channel measurement section 1059 calculates an estimated value of the downlink propagation path from the downlink reference signal, and outputs it to demultiplexing section 1055.

  The transmission unit 107 generates an uplink reference signal according to the control signal input from the control unit 103, encodes and modulates the uplink data (transport block) input from the higher layer processing unit 101, PUCCH, The PUSCH and the generated uplink reference signal are multiplexed and transmitted to the base station apparatus 3 via the transmission / reception antenna 109. The coding unit 1071 performs coding such as convolution coding and block coding on the uplink control information input from the higher layer processing unit 101, and relates to the coding rate notified of the uplink data by the uplink grant. Turbo coding is performed based on the information.

  When transmitting ACK / NACK along with uplink data using PUSCH, encoding section 1071 arranges ACK / NACK and encoded bits of uplink data as shown in FIG. 5 according to the control signal input from control section 103. Change.

  The modulation unit 1073 modulates the coded bits input from the coding unit 1071 using a modulation method notified by downlink control information such as BPSK, QPSK, 16QAM, 64QAM, or a modulation method predetermined for each channel. . Modulation section 1073 transmits the same PUSCH using MIMO SM based on the number of spatially multiplexed sequences notified by the uplink grant and information indicating precoding performed on the sequences. A sequence of modulation symbols of a plurality of uplink data is mapped to a plurality of sequences larger than the number of uplink data transmitted on the same PUSCH, and precoding is performed on the sequences.

  The uplink reference signal generation unit 1079 is a physical cell identifier (physical cell identity: referred to as PCI, Cell ID, etc.) for identifying the base station device 3, a bandwidth for arranging the uplink reference signal, and an uplink grant. Based on the notified cyclic shift or the like, the base station apparatus 3 obtains a known sequence that is obtained by a predetermined rule. The multiplexing unit 1075 rearranges the PUSCH modulation symbols in parallel according to the control signal input from the control unit 103, and then performs discrete Fourier transform (DFT) to generate the PUCCH and PUSCH signals and the generated uplink reference The signal is multiplexed for each transmission antenna port.

  Radio transmission section 1077 performs inverse fast Fourier transform (IFFT) on the multiplexed signal, performs SC-FDMA modulation, and adds a guard interval to the SC-FDMA-modulated SC-FDMA symbol. Generating a baseband digital signal, converting the baseband digital signal to an analog signal, generating an in-phase component and a quadrature component of an intermediate frequency from the analog signal, removing an extra frequency component for the intermediate frequency band, The intermediate frequency signal is converted to a high frequency signal (up convert), the excess frequency component is removed, the power is amplified, and output to the transmission / reception antenna 109 for transmission.

  FIG. 8 is a schematic block diagram showing the configuration of the base station apparatus 3 of the present invention. As illustrated, the base station apparatus 3 includes an upper layer processing unit 301, a control unit 303, a reception unit 305, a transmission unit 307, and a transmission / reception antenna 309. The higher layer processing unit 301 includes a radio resource control unit 3011, a HARQ control unit 3013, and an ACK / NACK detection unit 3015. The reception unit 305 includes a decoding unit 3051, a demodulation unit 3053, a demultiplexing unit 3055, a wireless reception unit 3057, and a channel measurement unit 3059. The transmission unit 307 includes an encoding unit 3071, a modulation unit 3073, a multiplexing unit 3075, a radio transmission unit 3077, and a downlink reference signal generation unit 3079.

  The upper layer processing unit 301 includes a medium access control (MAC) layer, a packet data integration protocol (PDCP) layer, a radio link control (RLC) layer, and a radio resource control (Radio). Resource Control (RRC) layer processing. Further, upper layer processing section 301 generates control information for controlling receiving section 305 and transmitting section 307 and outputs the control information to control section 303.

  The radio resource control unit 3011 included in the upper layer processing unit 301 generates downlink data (transport block), RRC signal, and MAC CE (Control Element) arranged in the downlink PDSCH, or acquires from the upper node. And output to the HARQ control unit 3013. Further, the radio resource control unit 3011 manages various setting information of each mobile station apparatus 1. For example, the radio resource control unit 3011 performs management of RNTI, such as allocating C-RNTI to the mobile station apparatus 1, and management of component carriers set in the mobile station apparatus 1.

  The HARQ unit 3013 included in the higher layer processing unit 301 performs HARQ control of downlink data. The HARQ control unit 3013 holds the downlink data acquired from the radio resource control unit 3011 in the HARQ buffer, and receives a NACK from the mobile station apparatus 1 for the downlink data held in the HARQ buffer. Outputs the retained downlink data to the transmission unit 307, generates control information for performing control to retransmit, and outputs the control information to the control unit 303.

  The ACK / NACK detection unit 3015 included in the higher layer processing unit generates control information for controlling the ACK / NACK decoding process of the reception unit 305 and outputs the control information to the control unit 303. The ACK / NACK detection unit 3015 determines the number of ACK / NACK bit sequences transmitted from the mobile station apparatus 1 from the number of downlink component carriers set in the mobile station apparatus 1 and the ACK / NACK arranged in the PUSCH. Calculate the number of modulation symbols.

  The ACK / NACK detection unit controls the reception unit 305 via the control unit 303 so as to separate the ACK / NACK modulation symbols included in the PUSCH based on the calculated number of ACK / NACK modulation symbols. The ACK / NACK detection unit confirms that the ACK / NACK for the downlink component carrier that has not transmitted the downlink data to the mobile station apparatus 1 is set to y that is a predetermined value via the control unit 303. To the receiving unit 305.

  The control unit 303 generates a control signal for controlling the reception unit 305 and the transmission unit 307 based on the control information from the higher layer processing unit 301. The control unit 303 outputs the generated control signal to the reception unit 305 and the transmission unit 307 and controls the reception unit 305 and the transmission unit 307.

  The receiving unit 305 separates, demodulates and decodes the received signal received from the mobile station apparatus 1 via the transmission / reception antenna 309 according to the control signal input from the control unit 303, and outputs the decoded information to the higher layer processing unit 301. To do. The radio reception unit 3057 converts an uplink signal received via the transmission / reception antenna 309 into an intermediate frequency (down covert), removes unnecessary frequency components, and appropriately maintains the signal level. In this way, the amplification level is controlled, and based on the in-phase and quadrature components of the received signal, quadrature demodulation is performed, and the quadrature demodulated analog signal is converted into a digital signal.

  The wireless reception unit 3057 removes a portion corresponding to a guard interval (GI) from the converted digital signal. The radio reception unit 3057 performs fast Fourier transform (FFT) on the signal from which the guard interval is removed, extracts a signal in the frequency domain, and outputs the signal to the demultiplexing unit 3055.

  The demultiplexing unit 1055 demultiplexes the signal input from the radio reception unit 3057 into signals such as PUCCH, PUSCH, and uplink reference signal. This separation is performed based on radio resource allocation information included in the uplink grant that is determined in advance by the radio resource control unit 3011 by the base station device 3 and notified to each mobile station device 1. The demultiplexing unit 3055 compensates for the propagation paths of the PUCCH and the PUSCH from the propagation path estimation value input from the channel measurement unit 3059. Further, the demultiplexing unit 3055 outputs the separated uplink reference signal to the channel measurement unit 3059.

  The demodulating unit 3053 performs inverse discrete Fourier transform (IDFT) on the PUSCH, obtains modulation symbols, and performs BPSK (Binary Phase Shift Keying), QPSK, 16QAM, PUCCH and PUSCH modulation symbols, respectively. The received signal is demodulated using a predetermined modulation scheme such as 64QAM, or a modulation scheme that the own device has previously notified to each mobile station device 1 using an uplink grant. Demodulation section 3053 separates the modulation symbol of uplink data and the modulation symbol of ACK / NACK included in PUSCH according to the control signal input from control section 303.

  Demodulation section 3053 is the same by using MIMO SM based on the number of spatially multiplexed sequences notified in advance to each mobile station apparatus 1 using an uplink grant and information indicating precoding to be performed on the sequences. The modulation symbols of a plurality of uplink data transmitted on the PUSCH are separated.

  The decoding unit 3051 transmits the demodulated uplink control information and the encoded bits of the uplink data to the mobile station apparatus 1 with an uplink grant according to a predetermined encoding method or a predetermined encoding method. Decoding is performed at the previously notified coding rate, and the decoded uplink data and uplink control information are output to the upper layer processing section 101. When PUSCH is retransmitted, decoding section 3051 performs decoding using the encoded bits held in the HARQ buffer input from higher layer processing section 301 and the demodulated encoded bits. Channel measurement section 309 measures an estimated channel value, channel quality, and the like from the uplink reference signal input from demultiplexing section 3055 and outputs the result to demultiplexing section 3055 and higher layer processing section 301.

  The transmission unit 307 generates a downlink reference signal according to the control signal input from the control unit 303, encodes and modulates the HARQ indicator, downlink control information, and downlink data input from the higher layer processing unit 301. Then, the PHICH, PDCCH, PDSCH, and downlink reference signal are multiplexed, and the signal is transmitted to the mobile station device 1 via the transmission / reception antenna 309.

  The encoding unit 3071 is a predetermined encoding method such as block encoding, convolutional encoding, turbo encoding, and the like for the HARQ indicator, downlink control information, and downlink data input from the higher layer processing unit 301 Or is encoded using the encoding method determined by the radio resource control unit 3011. The modulation unit 3073 modulates the coded bits input from the coding unit 3071 with a modulation scheme determined in advance by the radio resource control unit 3011 such as BPSK, QPSK, 16QAM, and 64QAM.

  The downlink reference signal generation unit 3079 uses, as a downlink reference signal, a sequence known by the mobile station apparatus 1 that is obtained by a predetermined rule based on a physical cell identifier (PCI) for identifying the base station apparatus 3 or the like. Generate. The multiplexing unit 3075 multiplexes the modulated modulation symbol of each channel and the generated downlink reference signal.

  The radio transmission unit 3077 performs inverse fast Fourier transform (IFFT) on the multiplexed modulation symbols and the like, performs modulation of the OFDM scheme, adds a guard interval to the OFDM symbol that has been OFDM-modulated, and baseband The baseband digital signal is converted to an analog signal, the in-phase and quadrature components of the intermediate frequency are generated from the analog signal, the extra frequency components for the intermediate frequency band are removed, and the intermediate-frequency signal is generated. Is converted to a high-frequency signal (up-convert: up-convert), an extra frequency component is removed, power is amplified, and output to the transmission / reception antenna 309 for transmission.

  Thus, according to the present invention, in a wireless communication system in which the mobile station device 1 and the base station device 3 perform wireless communication using a plurality of component carriers, the mobile station device 1 receives signals on a plurality of downlink component carriers. Channel coding (first coding) is performed on a plurality of ACK / NACKs (response information) for a plurality of downlink data, and the channel-coded ACK / NACK modulation symbols are only in four signal points. Coding bits are inserted so as to be arranged, ACK / NACK and uplink data are modulated into modulation symbols having four or more signal points using the same modulation scheme, and transmitted using the same PUSCH.

  Also, the mobile station apparatus 1 according to the present invention performs virtual QPSK processing on ACK / NACK depending on whether only one uplink data is transmitted on the PUSCH or a plurality of uplink data are spatially multiplexed. Determine whether or not.

  Further, according to the present invention, in a wireless communication system in which the mobile station apparatus 1 and the base station apparatus 3 perform wireless communication using a plurality of component carriers, the mobile station apparatus 1 receives a plurality of received signals by a plurality of downlink component carriers. The number of modulation symbols used for transmission of a plurality of ACK / NACK for the downlink data of at least using the number of bits of ACK / NACK, the number of bits of uplink data, and the amount of radio resources allocated to the initial transmission of PUSCH The calculated number of modulation symbols is compared with a predetermined number of modulation symbols, and ACK / NACK is transmitted on the physical uplink shared channel using the modulation symbol having the larger number of modulation symbols.

  Further, according to the present invention, in a wireless communication system in which the mobile station apparatus 1 and the base station apparatus 3 perform wireless communication using a plurality of component carriers, the mobile station apparatus 1 receives a plurality of received signals by a plurality of downlink component carriers. The number of bits used for transmission of a plurality of ACK / NACK for the downlink data of the base station apparatus is calculated from the number of downlink component carriers set in the base station apparatus, and the configured downlink component carrier that has not received the downlink data ACK / NACK is set to a predetermined value, ACK / NACK is encoded and modulated, and transmitted by PUSCH.

  Thereby, when transmitting ACK / NACK for a plurality of PDSCHs received by a plurality of downlink component carriers using one PUSCH, the number of bits of an ACK / NACK bit sequence generated by the mobile station apparatus 1 is efficiently calculated. Then, ACK / NACK encoding is performed, the number of modulation symbols used for ACK / NACK transmission is calculated, and the ACK / NACK modulation symbol and the uplink data modulation symbol are multiplexed on the PUSCH and transmitted. it can.

  A program that operates in the base station apparatus 3 and the mobile station apparatus 1 related to the present invention is a program (computer function) that controls a CPU (Central Processing Unit) or the like so as to realize the functions of the above-described embodiments related to the present invention. Program). Information handled by these devices is temporarily stored in RAM (Random Access Memory) during the processing, and then stored in various ROMs such as Flash ROM (Read Only Memory) and HDD (Hard Disk Drive). Reading, correction, and writing are performed by the CPU as necessary.

  In addition, you may make it implement | achieve the mobile station apparatus 1 in the embodiment mentioned above, and a part of base station apparatus 3 with a computer. In that case, the program for realizing the control function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by the computer system and executed.

  Here, the “computer system” is a computer system built in the mobile station apparatus 1 or the base station apparatus 3 and includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system.

  Furthermore, the “computer-readable recording medium” is a medium that dynamically holds a program for a short time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, In such a case, a volatile memory inside a computer system serving as a server or a client may be included and a program that holds a program for a certain period of time. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  Further, part or all of the mobile station device 1 and the base station device 3 in the above-described embodiment may be realized as an LSI that is typically an integrated circuit, or may be realized as a chip set. Each functional block of the mobile station device 1 and the base station device 3 may be individually chipped, or a part or all of them may be integrated into a chip. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. In addition, when an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology can also be used.

  As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the above, and various design changes and the like can be made without departing from the scope of the present invention. It is possible to

1 (1A, 1B, 1C) Mobile station apparatus 3 Base station apparatus 101 Upper layer processing section 103 Control section 105 Reception section 107 Transmission section 301 Upper layer processing section 303 Control section 305 Reception section 307 Transmission section 1011 Radio resource control section 1013 HARQ Control unit 1015 ACK / NACK control unit 3011 Radio resource control unit 3013 HARQ control unit 3015 ACK / NACK detection unit

Claims (16)

In a wireless communication system in which a mobile station device and a base station device perform wireless communication using a plurality of component carriers,
The mobile station device
First encoding a plurality of response information for a plurality of downlink data received by a plurality of downlink component carriers,
Second encoding is performed so that the modulation symbols of the response information subjected to the first encoding are arranged only in four signal points,
The response information that has been subjected to the second encoding and the uplink data that has been subjected to the third encoding are modulated into modulation symbols having four or more signal points using the same modulation scheme, and the same physical uplink shared channel is used. Send
The base station device
A wireless communication system, wherein the physical uplink shared channel is received and the response information is decoded. The mobile station device
Whether to perform the second encoding on the response information according to whether only one uplink data is transmitted on the physical uplink shared channel or a plurality of the uplink data are spatially multiplexed and transmitted The wireless communication system according to claim 1, wherein the wireless communication system is determined. In a wireless communication system in which a mobile station device and a base station device perform wireless communication using a plurality of component carriers,
The mobile station device
The number of modulation symbols used to transmit a plurality of response information for a plurality of downlink data received by a plurality of downlink component carriers is set to at least the number of bits of the response information, the number of bits of the uplink data, and the physical uplink shared Calculated using the amount of radio resources allocated to the initial transmission of the channel,
The calculated modulation symbol number is compared with a predetermined modulation symbol number, and the response information is transmitted on the physical uplink shared channel using the modulation symbol having the larger modulation symbol number,
The base station device
A wireless communication system, wherein the physical uplink shared channel is received and the response information is decoded. In a wireless communication system in which a mobile station device and a base station device perform wireless communication using a plurality of component carriers,
The mobile station device
The number of bits used for transmission of a plurality of response information for a plurality of downlink data received by a plurality of downlink component carriers is calculated from the number of downlink component carriers set in the base station device,
Set the response information for the configured downlink component carrier that has not received downlink data to a predetermined value;
Encoding and modulating the response information and transmitting it on a physical uplink shared channel;
The base station device
A wireless communication system, wherein the physical uplink shared channel is received and the response information is decoded. In a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of component carriers,
First encoding a plurality of response information for a plurality of downlink data received by a plurality of downlink component carriers,
Second encoding is performed so that the modulation symbols of the response information subjected to the first encoding are arranged only in four signal points,
The response information that has been subjected to the second encoding and the uplink data that has been subjected to the third encoding are modulated into modulation symbols having four or more signal points using the same modulation scheme, and the same physical uplink shared channel is used. A mobile station apparatus characterized by transmitting. In a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of component carriers,
The number of modulation symbols used to transmit a plurality of response information for a plurality of downlink data received by a plurality of downlink component carriers is set to at least the number of bits of the response information, the number of bits of the uplink data, and the physical uplink shared Calculated using the amount of radio resources allocated to the initial transmission of the channel,
The mobile station apparatus comprising: comparing the calculated number of modulation symbols with a predetermined number of modulation symbols, and transmitting the response information on a physical uplink shared channel using a modulation symbol having a larger number of modulation symbols . In a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of component carriers,
The number of bits used for transmission of a plurality of response information for a plurality of downlink data received by a plurality of downlink component carriers is calculated from the number of downlink component carriers set in the base station device,
Set the response information for the configured downlink component carrier that has not received downlink data to a predetermined value;
A mobile station apparatus that encodes and modulates the response information and transmits the response information through a physical uplink shared channel. In a base station apparatus that performs radio communication with a mobile station apparatus using a plurality of component carriers,
The mobile station device
First encoding a plurality of response information for a plurality of downlink data received by a plurality of downlink component carriers,
Second encoding is performed so that the modulation symbols of the response information subjected to the first encoding are arranged only in four signal points,
The response information that has been subjected to the second encoding and the uplink data that has been subjected to the third encoding are modulated into modulation symbols having four or more signal points using the same modulation scheme, and the same physical uplink shared channel is used. Send
The base station device
A base station apparatus that receives the physical uplink shared channel and decodes the response information. In a radio communication method used for a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of component carriers,
Performing a first encoding on a plurality of response information for a plurality of downlink data received by a plurality of downlink component carriers;
Performing the second encoding such that the modulation symbols of the response information subjected to the first encoding are arranged only in four signal points;
The response information that has been subjected to the second encoding and the uplink data that has been subjected to the third encoding are modulated into modulation symbols having four or more signal points using the same modulation scheme, and the same physical uplink shared channel is used. A wireless communication method comprising the step of transmitting. In a radio communication method used for a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of component carriers,
The number of modulation symbols used to transmit a plurality of response information for a plurality of downlink data received by a plurality of downlink component carriers is set to at least the number of bits of the response information, the number of bits of the uplink data, and the physical uplink shared Calculating with the amount of radio resources allocated for the initial transmission of the channel;
The calculated modulation symbol number is compared with a predetermined modulation symbol number, and the response information is transmitted on the physical uplink shared channel using the modulation symbol having the larger modulation symbol number. Wireless communication method. In a radio communication method used for a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of component carriers,
Calculating the number of bits used to transmit a plurality of response information for a plurality of downlink data received by a plurality of downlink component carriers from the number of downlink component carriers set in the base station device;
A wireless communication method comprising: setting the response information for the set downlink component carrier that has not received downlink data to a predetermined value. In a radio communication method used for a base station apparatus that performs radio communication with a mobile station apparatus using a plurality of component carriers,
The mobile station device
First encoding a plurality of response information for a plurality of downlink data received by a plurality of downlink component carriers,
Second encoding is performed so that the modulation symbols of the response information subjected to the first encoding are arranged only in four signal points,
The response information that has been subjected to the second encoding and the uplink data that has been subjected to the third encoding are modulated into modulation symbols having four or more signal points using the same modulation scheme, and the same physical uplink shared channel is used. Send
The base station device
A wireless communication method comprising: receiving the physical uplink shared channel; and performing a decoding process on the response information. In an integrated circuit used in a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of component carriers,
Performing a first encoding on a plurality of response information for a plurality of downlink data received by a plurality of downlink component carriers;
Performing the second encoding such that the modulation symbols of the response information subjected to the first encoding are arranged only in four signal points;
The response information that has been subjected to the second encoding and the uplink data that has been subjected to the third encoding are modulated into modulation symbols having four or more signal points using the same modulation scheme, and the same physical uplink shared channel is used. An integrated circuit comprising the step of transmitting. In an integrated circuit used in a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of component carriers,
The number of modulation symbols used to transmit a plurality of response information for a plurality of downlink data received by a plurality of downlink component carriers is set to at least the number of bits of the response information, the number of bits of the uplink data, and the physical uplink shared Calculating with the amount of radio resources allocated for the initial transmission of the channel;
The calculated modulation symbol number is compared with a predetermined modulation symbol number, and the response information is transmitted on the physical uplink shared channel using the modulation symbol having the larger modulation symbol number. Integrated circuit. In an integrated circuit used in a mobile station apparatus that performs radio communication with a base station apparatus using a plurality of component carriers,
Calculating the number of bits used to transmit a plurality of response information for a plurality of downlink data received by a plurality of downlink component carriers from the number of downlink component carriers set in the base station device;
An integrated circuit comprising: setting the response information for the set downlink component carrier that has not received downlink data to a predetermined value. In a radio communication method used for a base station apparatus that performs radio communication with a mobile station apparatus using a plurality of component carriers,
The mobile station device
First encoding a plurality of response information for a plurality of downlink data received by a plurality of downlink component carriers,
Second encoding is performed so that the modulation symbols of the response information subjected to the first encoding are arranged only in four signal points,
The response information that has been subjected to the second encoding and the uplink data that has been subjected to the third encoding are modulated into modulation symbols having four or more signal points using the same modulation scheme, and the same physical uplink shared channel is used. Send
The integrated circuit comprises:
An integrated circuit comprising: a step of receiving the physical uplink shared channel; and a step of decoding the response information.