JP5568066B2 - Wireless communication method, mobile station apparatus, wireless communication system, and integrated circuit - Google Patents

Description

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

  The evolution of cellular mobile radio access and wireless networks (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, a base station apparatus is a channel for transmitting uplink data (transport block) using downlink control information (Downlink Control Information: DCI) transmitted by PDCCH (Physical Downlink Control Channel). The mobile station apparatus is instructed to perform initial transmission or retransmission of PUSCH (Physical Uplink Shared Channel). Further, the base station apparatus receives the PUSCH transmitted from the mobile station apparatus, and transmits a HARQ (Hybrid Automatic Repeat reQuest) indicator indicating whether the PUSCH decoding is successful or not using a PHICH (Physical HARQ Indicator Channel).

  The HARQ indicator indicates ACK or NACK. When the base station apparatus successfully decodes the PUSCH, the HARQ indicator indicates ACK (ACKnowledgement), and when the base station apparatus fails to decode the PUSCH, the HARQ indicator indicates NACK (Negative ACKnowledgement).

  The mobile station apparatus first detects a signal using PHICH. When the mobile station apparatus detects a signal by PHICH, the mobile station apparatus sets ACK or NACK indicated by the HARQ indicator received by PHICH for HARQ feedback. When the mobile station apparatus does not detect a signal by PHICH, the mobile station apparatus sets nothing for HARQ feedback (holds the state of HARQ feedback).

  Next, the mobile station apparatus detects downlink control information. When the mobile station apparatus receives the downlink control information instructing the initial transmission of the PUSCH, the mobile station apparatus determines the uplink data to be transmitted on the PUSCH, stores the uplink data in the HARQ buffer, and determines the initial PUSCH according to the downlink control information. Transmit and set NACK as HARQ feedback. When the mobile station apparatus receives the downlink control information instructing the retransmission of the PUSCH, the mobile station apparatus retransmits the uplink data stored in the HARQ buffer according to the downlink control information using the PUSCH, and sets NACK as the HARQ feedback. . When the mobile station apparatus detects downlink control information instructing initial transmission or retransmission of PUSCH, the mobile station apparatus operates based on the HARQ indicator received by PHICH (that is, ACK or NACK set as HARQ feedback). Do not do.

  When the mobile station apparatus does not receive the downlink control information for the PUSCH, the mobile station apparatus transmits the PUSCH based on the set HARQ feedback. When NACK is set for HARQ feedback, the mobile station apparatus performs retransmission of PUSCH, and when ACK is set for HARQ feedback, the mobile station apparatus does not transmit PUSCH and is stored in the HARQ buffer. Keep the data. When NACK is set for HARQ feedback, the mobile station apparatus finally receives until receiving a HARQ indicator indicating ACK by PHICH or newly receiving downlink control information for PUSCH on PDCCH. The PUSCH is retransmitted based on the downlink control information. For example, the mobile station apparatus retransmits PUSCH when no signal is detected by PHICH in a state where NACK is set for HARQ feedback.

  In 3GPP, a radio access method and a radio network (hereinafter referred to as “Long Term Evolution-Advanced (LTE-A)” or “Advanced Evolved”) that realizes higher-speed data communication using a frequency band wider than LTE. Universal Terrestrial Radio Access (A-EUTRA) ”) is under study. In LTE-A, it has 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 LTE. -A mobile station apparatus is required to be able to perform radio communication with both LTE-A and LTE base station apparatuses, and it is considered that LTE-A uses the same channel structure as LTE. Yes.

  In LTE-A, a frequency band having the same channel structure as LTE (hereinafter referred to as “Component Carrier (CC)”) is aggregated and used as one frequency band (broadband frequency band). (Frequency band aggregation; also referred to as spectrum aggregation, carrier aggregation, frequency aggregation, etc.) has been studied. Specifically, in communication using frequency band aggregation, a downlink channel is transmitted for each downlink component carrier, and an uplink channel is transmitted for each uplink component carrier. That is, frequency band aggregation is a technology in which a base station apparatus and a plurality of mobile station apparatuses simultaneously transmit and receive a plurality of data and a plurality of control information using a plurality of channels and a plurality of component carriers in the uplink and the downlink. It is.

  In communication using frequency band aggregation, the base station apparatus sets the downlink component carrier and the uplink component carrier used for communication to the mobile station apparatus using an RRC signal (Radio Resource Control signal) and the like. It is proposed to notify an activation command indicating an downlink component carrier used for downlink communication from among link component carriers using PDCCH or MAC (Medium Access Control) CE (Control Element). ing. (Non-Patent Document 1)

"Open issues on component carrier activation and deactivation", 3GPP TSG RAN WG2 Meeting # 69, R2-101082, February 22-26, 2010.

  However, in the conventional technology, the downlink component carrier that receives the PHICH including the HARQ indicator for the PUSCH in a state where NACK is set in the HARQ feedback related to the PUSCH transmitted in the uplink in the mobile station apparatus, When the mobile station apparatus is removed from the downlink component carrier used for link communication and cannot detect the signal with PHICH, the mobile station apparatus retransmits the PUSCH regardless of whether or not the PUSCH of the base station apparatus is successfully decoded. There was a problem of repeatedly doing it.

  The present invention has been made in view of the above points, and an object thereof is to control PUSCH retransmission in a wireless communication system in which a mobile station apparatus and a base station apparatus communicate using a plurality of downlink component carriers. It is an object to provide a wireless communication method, a mobile station apparatus, a wireless communication system, and an integrated circuit that can be efficiently performed.

  (1) In order to achieve the above object, the present invention takes the following measures. That is, the radio communication method of the present invention is a HARQ indicator for uplink data transmitted to the base station apparatus in a radio communication method used for a mobile station apparatus communicating with the base station apparatus using a plurality of downlink component carriers. When the downlink component carrier that receives the signal is deactivated, it has means for setting ACK without receiving the HARQ indicator.

  (2) The mobile station apparatus of the present invention receives a HARQ indicator for uplink data transmitted to the base station apparatus in a mobile station apparatus that communicates with the base station apparatus using a plurality of downlink component carriers. When the downlink component carrier is deactivated, ACK is set without receiving the HARQ indicator.

  (3) Moreover, the radio communication system of the present invention is a radio communication system in which a mobile station apparatus and a base station apparatus communicate with each other using a plurality of downlink component carriers, and the mobile station apparatus transmits to the base station apparatus. When the downlink component carrier that receives the HARQ indicator for the uplink data is deactivated, the mobile station apparatus sets ACK without receiving the HARQ indicator, and the base station apparatus The station apparatus determines that ACK is set without receiving the HARQ indicator.

  (4) Further, the integrated circuit of the present invention is a HARQ for uplink data transmitted to the base station apparatus in an integrated circuit used in a mobile station apparatus that communicates with the base station apparatus using a plurality of downlink component carriers. When the downlink component carrier that receives the indicator is deactivated, it has a function of setting ACK without receiving the HARQ indicator.

  According to the present invention, in a wireless communication system in which a mobile station apparatus and a base station apparatus communicate using a plurality of downlink component carriers, the mobile station apparatus can efficiently perform PUSCH retransmission.

1 is a conceptual diagram of a wireless communication system according to a first embodiment of the present 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. FIG. 3 is a schematic diagram for explaining an uplink HARQ process according to the present 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 flowchart figure which shows an example of operation | movement of the mobile station apparatus 1 of the 2nd Embodiment of this invention.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a conceptual diagram of a radio communication system according to the first embodiment 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 a synchronization signal (SS), a downlink reference signal (DL RS), a physical broadcast channel in radio communication (downlink) from the base station apparatus 3 to the mobile station apparatuses 1A to 1C. (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 illustrates uplink reference signals (UL RS), physical uplink control channels (Physical Uplink Control Channels) in radio communication (uplink) from the mobile station apparatuses 1A to 1C to the base station apparatus 3. : PUCCH), Physical Uplink Shared Channel (PUSCH), and Physical Random Access Channel (PRACH). Hereinafter, the mobile station apparatuses 1A to 1C are referred to as the mobile station apparatus 1.

  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. In each downlink component carrier subframe, a PHICH indicated by an area hatched by a grid-like line, a PDCCH indicated by a hatched area, and an hatched area are hatched. There is a region where the PDSCH indicated by the region that is not subjected to is arranged. The region where the PHICH is arranged and the region where the PDCCH is arranged are frequency multiplexed and / or time multiplexed. The region where PHICH and PDCCH are frequency-multiplexed and / or time-multiplexed and the region where PDSCH is arranged are time-multiplexed.

  On the other hand, the uplink subframe U1 is composed of three uplink component carriers (UL CC-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 sends an activation command (activation command) indicating a downlink component carrier used for downlink communication from among the set downlink component carriers, PDCCH or MAC (Medium Access Control) CE (Control Element) Notify using etc. For example, the activation command is composed of a bitmap, and when the value of the bit corresponding to each downlink component carrier is “1”, this indicates that the downlink component carrier is used for downlink communication, and the bit value “0” indicates that the downlink component carrier is not used for downlink communication. The activation command is applied after a predetermined time after receiving the activation command (for example, after one subframe or after four subframes). The MAC CE is transmitted using PDSCH.

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

  An activated downlink component carrier is referred to as an activated downlink component carrier or a configured and activated downlink component carrier and is deactivated The component carrier is referred to as a deactivated downlink component carrier or a configured and deactivated downlink component carrier.

  The mobile station apparatus 1 may deactivate the downlink component carrier by a method different from the method of deactivating the downlink component carrier that is notified that the activation command is not used for downlink communication. For example, the mobile station device 1 may deactivate the downlink component carrier when a predetermined time has elapsed after the activation of the downlink component carrier with the activation command, or the activated downlink component carrier The downlink component carrier may be deactivated when a predetermined time has elapsed since the last reception of PDCCH or PDSCH. That is, the downlink component carrier may be deactivated based on the judgment of the mobile station device 1 itself. Note that the base station apparatus 3 may set the predetermined time and notify the mobile station apparatus 1 of information including this setting with an RRC signal.

  The mobile station apparatus 1 does not receive the deactivated downlink component carrier signal. The base station apparatus 3 determines that the mobile station apparatus 1 does not receive the deactivated downlink component carrier signal. For example, the base station apparatus 3 arranges a signal (PDSCH, PDCCH, PHICH, etc.) on one or a plurality of downlink component carriers among the activated downlink component carriers in the downlink subframe, and the mobile station Transmit to device 1. The mobile station apparatus 1 monitors and receives only the activated downlink component carrier signals (PDSCH, PDCCH, PHICH, etc.).

  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. Until the setting of the downlink primary component carrier and the uplink primary component carrier, the mobile station device 1 uses the downlink component carrier and the uplink component carrier used for the initial access as the downlink primary component carrier and the uplink primary component. Set as a component carrier.

  The base station apparatus 3 cannot deactivate the downlink primary component carrier, that is, the downlink primary component carrier is always activated. The uplink primary component carrier is used to transmit uplink control information.

  The base station apparatus 3 allocates the PUSCH radio resource of one or more uplink component carriers among the configured uplink component carriers in the uplink subframe, and indicates the radio resource allocation to this PUSCH. Control information (Downlink Control Information: DCI) is transmitted on the activated PDCCH of the downlink component carrier. The mobile station apparatus 1 arranges a signal on the PUSCH of one or a plurality of uplink component carriers among the configured uplink component carriers in accordance with the downlink control information indicating the allocation of the radio resources of the PUSCH, and the base station apparatus 3 to send.

  In the downlink subframe, the downlink control information for the PDSCH of the downlink component carrier and the PUSCH of the uplink component carrier is one of the downlink component carriers set and activated. It is transmitted to mobile station apparatus 1 using the PDCCH of the carrier. The PDCCH for the PDSCH of the downlink component carrier and the PDCCH for the PUSCH of the uplink component carrier may be arranged in different downlink component carriers for each subframe.

  That is, for one PDSCH of a downlink component carrier or one PUSCH of an uplink component carrier, a plurality of PDCCHs are simultaneously transmitted by one downlink component carrier or a plurality of downlink component carriers. There is nothing. For example, in FIG. 2, in the downlink subframe, the PDCCH for the PUSCH of UL CC-1 is one downlink component carrier (DL CC-1 or DL CC) among DL CC-1 to DL CC-4. -2 or DL CC-3 or DL CC-4).

  In addition, the downlink component carrier which can transmit PDCCH with respect to PDSCH of a downlink component carrier or PUSCH of an uplink component carrier may be restrict | limited. For example, in FIG. 2, the PDCCH for the PUSCH of UL CC-1 may be limited to be transmitted only on one downlink component carrier among DL-CC1 and DL CC2 for each subframe. Moreover, you may restrict | limit so that PDCCH with respect to PUSCH of UL CC-1 may be transmitted only by DL CC-1 for every sub-frame.

  A HARQ (Hybrid Automatic Repeat reQuest) indicator indicating the success or failure of decoding of the PUSCH transmitted by the mobile station apparatus 1 on the uplink component carrier is transmitted on the PHICH of the downlink component carrier on which the PDCCH for this PUSCH was last transmitted. For example, in FIG. 2, when the mobile station apparatus 1 finally receives the PDCCH for the PUSCH of the UL CC-1 in the DL CC-1, and transmits the PUSCH in the UL CC-1, the HARQ indicator for the PUSCH is the DL CC- 1 is transmitted with PHICH. When the base station apparatus 3 successfully decodes the PUSCH, the HARQ indicator indicates ACK (ACKnowledgement), and when the base station apparatus fails to decode the PUSCH, the HARQ indicator indicates NACK (Negative ACKnowledgement).

  FIG. 3 is a schematic diagram illustrating an example of a configuration of a downlink radio frame according to the present invention. FIG. 3 shows a configuration of a radio frame in the downlink component carrier. In FIG. 3, the horizontal axis is the time domain, and the vertical axis is the frequency domain. As shown in FIG. 3, the radio frame of the downlink component carrier 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 channels allocated in the downlink component carrier will be described. In each downlink subframe, for example, PDCCH, PHICH, PDSCH, and a downlink reference signal are allocated. First, PDCCH will be described. The PDCCH is arranged from the first OFDM symbol of the subframe (the area hatched with a left oblique line in FIG. 3). Note that the number of OFDM symbols in which the PDCCH is arranged is 1 to 3, and is different for each subframe. The PDCCH includes downlink control information, which is information used for control of communication, configured in an information format such as downlink assignment (also referred to as downlink assignment or downlink grant) and uplink grant (Uplink grant). A signal is placed. In each subframe, a plurality of PDCCHs are frequency-multiplexed and time-multiplexed in each downlink component carrier.

  The downlink assignment includes information on modulation scheme and coding for PDSCH, information indicating radio resource allocation, information on HARQ indicating initial transmission or retransmission, TPC command, and the like. Further, the uplink grant includes information on modulation scheme and coding for PUSCH, information indicating radio resource allocation, information on HARQ indicating initial transmission or retransmission, a TPC command, and the like. Note that HARQ means that, for example, the mobile station apparatus 1 (base station apparatus 3) transmits HARQ feedback indicating success or failure of data decoding to the base station apparatus 3 (mobile station apparatus 1), and the mobile station apparatus 1 (base station apparatus). When the device 3) cannot decode the data due to an error (NACK), the base station device 3 (mobile station device 1) retransmits the signal, and the mobile station device 1 (base station device 3) has already received the signal again. This is a technique for performing a decoding process on a combined signal with a signal.

  The information on HARQ that configures the downlink assignment and the uplink grant includes NDI (New Data Indicator). When receiving the downlink assignment or the uplink grant, the mobile station apparatus 1 stores the NDI included in the received downlink assignment or the uplink grant. At this time, if the mobile station apparatus 1 already stores the NDI, it is determined whether the NDI is toggled, and then overwritten with the new NDI.

  When the NDI is toggled, the mobile station apparatus 1 determines that the downlink assignment or uplink grant indicates initial transmission. When the NDI is not toggled, the mobile station apparatus 1 determines the downlink assignment or uplink. It is determined that the grant indicates initial transmission. NDI is toggled means that the stored NDI value is different from the received NDI value. If NDI is not toggled, the stored NDI value is the same as the received NDI value. It is to be. Hereinafter, the NDI included in the downlink assignment or uplink grant is toggled, and the downlink assignment or uplink grant is referred to as instructing initial transmission, and the NDI is not toggled. It is said that the downlink assignment or the uplink grant is instructing retransmission.

  A method for encoding downlink control information will be described. First, the base station apparatus 3 adds, to the downlink control information, a sequence in which a cyclic redundancy check (CRC) code generated based on downlink control information is scrambled with an RNTI (Radio Network Temporary Identifier). . The mobile station apparatus 1 changes the interpretation of the downlink control information depending on which RNTI the cyclic redundancy check code is scrambled. For example, if the cyclic redundancy check code is scrambled by the C-RNTI (Cell-Radio Network Temporary Identity) assigned by the mobile station apparatus 1 from the base station apparatus 3, the downlink control information is addressed to the mobile station apparatus 1 It is determined that the radio resource is indicated. Hereinafter, the addition of a cyclic redundancy check code scrambled with RNTI to downlink control information is simply expressed as RNTI included in downlink control information or RNTI included in PDCCH.

  The mobile station apparatus 1 decodes the PDCCH, descrambles the sequence corresponding to the cyclic redundancy check code scrambled by the RNTI with the RNTI stored by the mobile station apparatus 1, and makes an error based on the descrambled cyclic redundancy check code. When it is detected that there is no PDCCH, it is determined that acquisition of the PDCCH is successful. This process is called blind decoding.

  Next, PHICH will be described. In each subframe, PHICH and PDCCH are frequency-multiplexed within the same OFDM symbol (in FIG. 3, the area hatched by grid lines). 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 the PHICH, a HARQ indicator indicating success / failure of PUSCH decoding (ACK / NACK) is arranged. In each subframe, a plurality of PHICHs are frequency-multiplexed and code-multiplexed in each downlink component carrier.

  The HARQ indicator indicating the success or failure of decoding of the PUSCH transmitted by the mobile station apparatus 1 on the uplink component carrier is transmitted on the PHICH of the same downlink component carrier on which the uplink grant for this PUSCH was transmitted last. Also, in which PHICH in the downlink component carrier the HARQ indicator for the PUSCH is arranged is the physical resource block with the smallest number (of the lowest frequency region) among the physical resource blocks allocated to this PUSCH. It is determined from the number and information related to the cyclic shift of the uplink reference signal time-multiplexed with the PUSCH, which is included in the uplink grant.

  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. In the uplink reference signal, code multiplexing is used, and a plurality of different codes are used. For example, a plurality of different codes are generated by periodically shifting (referred to as cyclic shift) a predetermined basic sequence, and different codes are generated by cyclic shifts of different shift amounts.

  Next, PDSCH will be described. The PDSCH is arranged in an OFDM symbol other than the OFDM symbol in which the PDCCH and / or PHICH of the subframe is arranged (in FIG. 3, a region not hatched). On the PDSCH, a signal of downlink data (or referred to as “Transport Block”) is arranged. PDSCH radio resources are allocated using downlink assignment. The PDSCH radio resources are arranged in the same downlink subframe as the PDCCH including the downlink assignment used for the PDSCH assignment in the time domain, and the downlink used for the PDSCH assignment in the frequency domain. It is arranged on the same downlink component carrier as the PDCCH including the link assignment or on a different downlink component carrier.

  The downlink assignment includes information (hereinafter, referred to as “downlink carrier indicator”) indicating which downlink component carrier is associated with the PDSCH of this downlink assignment. When a downlink carrier indicator is not included in the downlink assignment, the downlink assignment not including the downlink carrier indicator and the PDSCH corresponding to the downlink assignment are transmitted on the same downlink component carrier. In each subframe, a plurality of PDSCHs are frequency-multiplexed and spatially multiplexed in each downlink component carrier. 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. FIG. 4 shows a configuration of a radio frame in the uplink component carrier. In FIG. 4, 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. 4) is composed of 12 subcarriers (15 kHz) in the frequency domain, and 7 SC-FDMA symbols ( 71 μs).

  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, a channel allocated in an uplink radio frame will be described. In each uplink subframe, for example, a PUCCH, a PUSCH, and an uplink reference signal are allocated. First, PUCCH will be described. The PUCCH is allocated to uplink physical resource block pairs (regions hatched with left diagonal lines) at both ends of the uplink component carrier band. The PUCCH includes communication quality control such as channel quality information indicating downlink channel quality, scheduling request (SR) indicating a request for uplink radio resource allocation, and ACK / NACK for PDSCH. Uplink Control Information (UCI) signal, which is information used for the transmission, is arranged. In each subframe, a plurality of PUCCHs are frequency-multiplexed and code-multiplexed in each uplink component carrier.

  Next, PUSCH will be described. The PUSCH is assigned to 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. In the PUSCH, uplink control information and uplink data (transport block) signals that are information other than the uplink control information are 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.

  The uplink grant includes information (hereinafter, referred to as an “uplink carrier indicator”) indicating which uplink component carrier the PUSCH is for which uplink grant. Further, when the uplink grant does not include an uplink carrier indicator, the uplink grant that does not include the uplink carrier indicator is a downlink component that is associated in advance with the uplink component carrier to which the uplink grant corresponds. Sent on carrier. In each subframe, a plurality of PUSCHs are frequency-multiplexed and spatially multiplexed in each uplink component carrier. The uplink reference signal is time-multiplexed with PUCCH and PUSCH, but detailed description is omitted for the sake of simplicity.

  FIG. 5 is a schematic diagram illustrating an uplink HARQ process according to the present invention. In FIG. 5, the horizontal axis is the time domain, the square hatched with a grid-like line indicates PHICH, the hatched square with a right diagonal line indicates PDCCH (uplink grant), and the horizontal line is hatched. The squares indicate PUSCH, and the numbers given to PHICH, PDCCH, and PUSCH indicate the number of HARQ processes to which each channel corresponds. In the present invention, multiple (eight) HARQ processes operate independently and simultaneously for each uplink component carrier.

  The HARQ process number to which the PUSCH corresponds is associated with the uplink subframe number. For example, the remainder of dividing the subframe number by the number of HARQ processes operating simultaneously in the uplink component carrier is set as the HARQ process number in the uplink component carrier corresponding to the subframe. The number of the HARQ process to which PHICH and PDCCH (uplink grant) correspond is associated with the number of the downlink subframe. In the uplink and downlink, the corresponding HARQ process number is shifted by four.

  HARQ processes associated with different uplink component carriers can be performed simultaneously in the same subframe. For example, when the mobile station device 1 and the base station device 3 communicate using three uplink component carriers as shown in FIG. 2, 8 × 3 = 24 HARQ processes operate independently and simultaneously. For simplicity of explanation, FIG. 5 shows only the PUSCH of one uplink component carrier.

  Each HARQ process is associated with one HARQ buffer. The mobile station apparatus 1 stores the uplink data (transport block) transmitted on the PUSCH in the HARQ buffer of the HARQ process corresponding to the PUSCH, stores the uplink grant received last on the corresponding PDCCH, and HARQ. ACK or NACK set as feedback is stored. The base station apparatus 3 stores the uplink data received and decoded on the PUSCH in the HARQ buffer of the HARQ process corresponding to the PUSCH, and the uplink grant transmitted last on the corresponding PDCCH.

  In addition, when the mobile station apparatus 1 can transmit multiple uplink data (transport blocks) using one PUSCH using MIMO (Multiple Input Multiple Output) SM (Spatial Multiplexing), each HARQ process has one It is necessary to be associated with the same number of HARQ buffers as the number of uplink data (transport blocks) transmitted on the PUSCH.

  A PDCCH (uplink grant) for a HARQ process of a certain uplink component carrier may be transmitted using a different downlink component carrier for each HARQ process timing, or a downlink component carrier corresponding to each uplink component carrier. May be sent only. The PHICH for the HARQ process of a certain uplink component carrier is transmitted on the downlink component carrier to which the PDCCH (uplink grant) related to the HARQ process is last transmitted.

  For example, in FIG. 5, the mobile station apparatus 1 receives a PDCCH (uplink grant) instructing initial transmission related to the HARQ process No. 0 in the nth downlink subframe, and the n + 4th uplink subframe. Then, the PUSCH for the HARQ process number 0 is initially transmitted according to this PDCCH (uplink grant). The mobile station apparatus 1 receives the PHICH and the PDCCH (uplink grant) related to the HARQ process No. 0 in the (n + 8) th downlink subframe, and the PHICH or PDCCH (uplink) in the (n + 12) th uplink subframe In accordance with (link grant), initial transmission or retransmission of PUSCH related to the HARQ process of No. 0 is performed.

  Thus, the downlink subframe and the uplink subframe corresponding to the same HARQ process are shifted by 4 ms (4 subframes, 4 TTIs). Also, PHICH, PDCCH (uplink grant) and PUSCH for the same HARQ process are transmitted at intervals of 8 ms (8 subframes, 8 TTI).

  In the uplink HARQ process of the present invention, the mobile station apparatus 1 first sets ACK or NACK indicated by the HARQ indicator received by PHICH as HARQ feedback. When the mobile station apparatus 1 receives the uplink grant instructing the initial transmission of the PUSCH on the PDCCH, the mobile station apparatus 1 determines new uplink data to be transmitted on the PUSCH without depending on the ACK or NACK set as the HARQ feedback. The uplink data is stored in the HARQ buffer, the received uplink grant is stored, PUSCH is initially transmitted according to the stored uplink grant, and NACK is set as HARQ feedback.

  When the mobile station apparatus 1 receives the uplink grant instructing the PUSCH retransmission on the PDCCH, the mobile station apparatus 1 does not depend on the ACK or NACK set as the HARQ feedback and receives the stored uplink grant. Overwrite the link grant, retransmit the uplink data stored in the HARQ buffer according to the overwritten uplink grant on the PUSCH, and set NACK as HARQ feedback. When the HARQ buffer is empty, the mobile station device 1 determines the uplink data to be transmitted on the PUSCH without depending on whether the uplink grant instructs initial transmission or re-transmission. Uplink data is stored in the HARQ buffer, the received uplink grant is stored, PUSCH is initially transmitted according to the stored uplink grant, and NACK is set as HARQ feedback.

  When the mobile station apparatus 1 does not receive the uplink grant for the PUSCH and NACK is set as the HARQ feedback, the mobile station apparatus 1 retransmits the uplink data stored in the HARQ buffer on the PUSCH according to the stored uplink grant. Send. When the mobile station apparatus 1 does not receive the uplink grant for the PUSCH and ACK is set as the HARQ feedback, the mobile station apparatus 1 does not transmit the PUSCH, and is stored in the HARQ buffer managed by the HARQ process. Retain data.

  When the mobile station apparatus 1 receives the uplink grant for the PUSCH of the UL CC-1 in the nth subframe of the DL CC-1 in FIG. 5, the n + 4th subframe of the UL CC-1 according to the received uplink grant. Transmits PUSCH and sets NACK as HARQ feedback. When the DL CC-1 is deactivated before the n + 8th subframe in which the mobile station apparatus 1 receives the PHICH for this PUSCH in the DL CC-1, the mobile station apparatus 1 performs the DL in the n + 8th subframe. CC-1 cannot receive PHICH. At this time, if the NACK is still set as the HARQ feedback, the mobile station apparatus 1 is an uplink subframe corresponding to the 0th HARQ process ((n + 4 + 8 × i) th subframe: i is an integer), and n The PUSCH retransmission is continued according to the uplink grant received in the sub-frame of the first DL CC-1.

  In order to avoid such unnecessary PUSCH retransmission, the present invention takes the following measures. 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 performs the process of FIG. 6 for each HARQ process. When the processing of the HARQ process is started, the mobile station apparatus 1 activates the downlink component carrier that receives the PHICH for the HARQ process (that is, the downlink component carrier that last received the uplink grant for the HARQ process). It is determined whether or not (step S100).

  When the mobile station apparatus 1 determines that the downlink component carrier that receives the PHICH for the HARQ process is activated, the mobile station apparatus 1 receives the PHICH and uses ACK or NACK indicated by the HARQ indicator included in the received PHICH as HARQ feedback. Set (step S101). Next, the mobile station apparatus 1 determines whether or not an uplink grant addressed to itself is detected (step S103). When determining that the uplink grant has been detected, the mobile station device 1 stores the detected uplink grant, sets NACK as HARQ feedback (step S104), and performs initial transmission of PUSCH according to the stored uplink grant or Re-transmission is performed (step S106).

  When determining that the uplink grant is not detected in Step S103, the mobile station device 1 determines which of ACK and NACK is set as HARQ feedback (Step S105). When determining that NACK is set as HARQ feedback in step S105, the mobile station apparatus 1 performs PUSCH retransmission according to the stored uplink grant (step S106). If it is determined in step S105 that ACK is set as HARQ feedback, the mobile station device 1 does not transmit the PUSCH and retains the content of the HARQ buffer corresponding to the HARQ process (step S107).

  After Step S106 and Step S107, the mobile station apparatus 1 returns to Step S100 in the next downlink subframe corresponding to this HARQ process (Step S108), and the downlink component carrier that receives the PHICH for the HARQ process is activated. It is determined whether or not it has been done.

  In Step S100, when it is determined that the downlink component carrier that receives PHICH is not activated, that is, is deactivated, the mobile station device 1 does not receive PHICH and sets ACK as HARQ feedback ( Step S102). If the downlink component carrier capable of transmitting the uplink grant for the HARQ process of the uplink component carrier is not among the activated downlink component carriers, the mobile station apparatus 1 performs ACK in step S102. In step S103, it is determined that no uplink grant has been detected. In step S105, it is determined that ACK is set in HARQ feedback. In step S107, PUSCH is not transmitted, and the HARQ process is supported. The contents of the HARQ buffer to be held are held.

  When a downlink component carrier capable of transmitting an uplink grant for the HARQ process of this uplink component carrier is among the activated downlink component carriers, the base station apparatus 3 transmits an uplink grant. The mobile station apparatus 1 determines that the uplink grant is detected in step S103 after setting the ACK in step S102 by transmitting the uplink grant on the activated downlink component carrier that can be activated. In step S106, PUSCH can be initially transmitted or retransmitted according to the received and detected uplink grant.

  In addition, when the HARQ buffer related to the HARQ process is empty, or when the HARQ process has never been used for communication with the base station apparatus after the mobile station apparatus 1 is turned on, ACK is set as the HARQ feedback. In the case where the mobile station apparatus 1 has been configured, the mobile station apparatus 1 may not receive the PHICH corresponding to the HARQ process in step S101. If the uplink grant instructing retransmission is received after holding the contents of the HARQ buffer in step S107, the contents of the HARQ buffer can be retransmitted on the PUSCH. For example, the base station device 3 transmits an uplink grant using an activated downlink component carrier, deactivates the downlink component carrier used for transmission of the uplink grant, and uses the deactivated downlink component carrier. The mobile station apparatus 1 can be instructed to re-activate and retransmit the PUSCH transmitted in the previously activated state.

  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 a HARQ storage 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.

  The upper layer processing unit 101 outputs uplink data, an RRC signal, and a MAC CE generated by a user operation or the like to the transmission unit 207. 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 on 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. Also, the radio resource control unit 1011 generates information arranged in each uplink channel and outputs the information to the transmission unit 107.

  The radio resource control unit 1011 manages the downlink component carrier and the uplink component carrier set by the RRC signal notified from the base station apparatus 3, and the downlink component carrier activated or deactivated by an activation command or the like. Do. The radio resource control unit 1011 manages the downlink component carrier in which the downlink assignment for the configured downlink component carrier and the uplink grant for the configured uplink component carrier are arranged.

  The HARQ control unit 1013 included in the higher layer processing unit 101 manages an uplink HARQ process. The HARQ storage unit 1015 included in the higher layer processing unit 101 includes a HARQ buffer associated with each uplink HARQ process managed by the HARQ control unit 1013. The HARQ storage unit 1015 stores uplink grants and HARQ feedback (ACK or NACK) related to each HARQ process. The downlink HARQ process is not related to the present invention, and thus the description thereof is omitted.

  The HARQ control unit 1013 performs the following operation for each HARQ process. The HARQ control unit 1013 inputs uplink data (transport block) transmitted on the PUSCH to the HARQ buffer, and receives the ACK or NACK indicated by the HARQ indicator received from the PHICH input from the reception unit 105 and the PDCCH. The uplink grant is stored in the HARQ storage unit 1015. The HARQ control unit 1013 performs HARQ control according to the flowchart of FIG. 6 based on the ACK or NACK stored in the HARQ storage unit 1015 and the uplink grant.

  The HARQ control unit 1013 associates the number (timing) of the uplink component carrier and subframe in which the PUSCH is transmitted with the HARQ process. HARQ control section 1013 assigns PUSCH physical resource blocks among a plurality of PHICHs in the downlink component carrier in which the uplink grant was last received, and cyclic shift of the uplink reference signal that is time-multiplexed with PUSCH. The PHICH corresponding to this HARQ process is determined from the information included in the uplink grant.

  The HARQ control unit 1013 determines the HARQ process corresponding to the received uplink grant from the uplink carrier indicator included in the uplink grant and the number (timing) of the subframe in which the uplink grant is received. When the uplink grant does not include the uplink carrier indicator, the HARQ control unit 1013 determines that the received uplink grant is based on the downlink component carrier and the subframe number (timing) from which the uplink grant is received. Determine the corresponding HARQ process.

  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. The control unit 103 outputs the generated control signal to the reception unit 105 and the transmission unit 107 to control the reception unit 105 and the transmission 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 demodulates PHICH 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. 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. .

  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 Multiplex the signal.

  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 upper layer processing unit 301 includes a radio resource control unit 3011, a HARQ control unit 3013, and a HARQ storage 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, the upper layer processing unit 301 generates control information for controlling the reception unit 305 and the transmission unit 307 and outputs the control information to the control unit 303. The radio resource control unit 3011 included in the higher layer processing unit 301 generates downlink data (transport block), RRC signal, and MAC CE arranged in the downlink PDSCH, or acquires from the upper node, and transmits the transmission unit 307. Output to. 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 RNTI management such as assigning C-RNTI to the mobile station apparatus 1.

  The radio resource control unit 3011 manages the downlink component carrier and the uplink component carrier set for each mobile station apparatus 1 and the activated or deactivated downlink component carrier. The radio resource control unit 3011 sets a downlink component carrier and an uplink component carrier used for communication to each mobile station apparatus 1 and transmits via the control unit 303 so as to notify information related to this setting using an RRC signal. The unit 307 is controlled.

  The radio resource control unit 3011 sets the downlink component carrier used for communication and the downlink component carrier on which the PDCCH for the uplink component carrier is arranged for each mobile station apparatus 1, and notifies information related to this setting using an RRC signal. Thus, the transmission unit 307 is controlled via the control unit 303. The radio resource control unit 3011 controls the transmission unit 307 via the control unit 303 so that each mobile station apparatus 1 is notified of the activation command by PDCCH or MAC CE.

  The HARQ control unit 3013 provided in the higher layer processing unit 301 manages the uplink HARQ process of each mobile station apparatus 1. The HARQ storage unit 3015 provided in the higher layer processing unit 301 includes a plurality of HARQ buffers corresponding to each uplink HARQ process managed by the HARQ control unit 3013. The downlink HARQ process is not related to the present invention, and thus the description thereof is omitted. The uplink data (transport block) received by the PUSCH input from the HARQ control unit 3013 and the reception processing unit 305 is input to the HARQ buffer, and an error detection code (cyclic redundancy check code) added to the uplink data is input. To determine whether or not the decoding of the uplink data is successful.

  The HARQ control unit 3013 generates a HARQ indicator indicating ACK when determining that the decoding of uplink data is successful, and generates a HARQ indicator indicating NACK when determining that the decoding of the uplink data has failed. And output to the transmission unit 307. When the HARQ control unit 3013 determines that the decoding of the uplink data has failed, the HARQ control unit 3013 changes the information on the radio resource allocation, the modulation scheme, and the coding rate, and sets the uplink grant that instructs retransmission including the changed information. The transmission unit 307 may be controlled via the control unit 303 so as to transmit.

  When the uplink data retransmitted in the mobile station apparatus 1 is input from the reception unit 305, the HARQ control unit 3013 combines the uplink data already stored in the HARQ buffer and the retransmitted uplink data. Then, it is determined whether or not the uplink data has been successfully decoded. The HARQ control unit 3013 associates the uplink component carrier and subframe number (timing) with which the mobile station apparatus 1 transmits the PUSCH with the HARQ process number.

  The HARQ control unit 3013 allocates PUSCH physical resource blocks among a plurality of PHICHs in a downlink component carrier in which an uplink grant is last transmitted for a certain HARQ process, and an uplink that is time-multiplexed with the PUSCH. A PHICH used to transmit ACK / NACK corresponding to this HARQ process is determined from information included in the uplink grant related to the cyclic shift of the reference signal.

  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 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 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. Note that 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. In addition, demultiplexing section 3055 compensates for the propagation paths of PUCCH and PUSCH from the propagation path estimation value input from channel measurement section 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.

  The decoding unit 3051 encodes the demodulated PUCCH and PUSCH encoded bits in a predetermined encoding method, in advance, or in which the own apparatus has previously notified the mobile station apparatus 1 with an uplink grant. And the decoded uplink data and the uplink control information are output to the upper layer processing unit 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 received 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 each modulated channel and the generated downlink reference signal.

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

  Thus, according to the present invention, in a wireless communication system in which the mobile station apparatus 1 and the base station apparatus 3 communicate using a plurality of downlink component carriers, the uplink transmitted from the mobile station apparatus 1 to the base station apparatus 3 When the downlink component carrier that receives the PHICH in which the HARQ indicator for the link data (transport block) is arranged is deactivated, the mobile station apparatus 1 does not receive the HARQ indicator in the PHICH and does not receive the corresponding HARQ. ACK is set as HARQ feedback in the process, and the base station apparatus 3 determines that the mobile station apparatus 1 has set ACK as HARQ feedback in the corresponding HARQ process without receiving the HARQ indicator arranged in the PHICH.

  Note that the present invention can achieve the same effect when the downlink component carrier that receives the PHICH is excluded from the setting of the downlink component carrier used for communication using the RRC signal. That is, when the downlink component carrier from which PHICH is received is excluded from the downlink component carriers used for communication, the mobile station apparatus 1 sets ACK to the corresponding HARQ process.

  6, when the downlink component carrier is deactivated at the timing when the mobile station apparatus 1 receives PHICH in steps S100 and S102 of FIG. 6, the mobile station apparatus 1 sets ACK. When the mobile station apparatus 1 transmits the PUSCH in S106, if it is known that the downlink component carrier that receives the PHICH is deactivated before receiving the PHICH for the PUSCH, the mobile station apparatus 1 moves after the step S106. The station apparatus 1 may set ACK. As a result, when the downlink component carrier that receives the PHICH is deactivated, the mobile station apparatus 1 leaves the control of the base station apparatus 3 and avoids unnecessary retransmission of the PUSCH. Can be efficiently controlled.

  In the present invention, the RRC signal is used to set the downlink component carrier in which the PHICH for a certain uplink component carrier is not the downlink component carrier in which the uplink grant for the uplink component carrier is arranged. It may be applied to That is, when the downlink component carrier from which the PHICH is received is excluded from the downlink component carriers in which the uplink grant is arranged, the mobile station apparatus 1 sets ACK to the corresponding HARQ process.

  For example, in FIG. 2, when the downlink component carrier in which the uplink grant for UL CC-1 is transmitted is set as DL CC-1, the mobile station apparatus 1 uses the uplink grant for UL CC-1 and PHICH is received by DL CC-1. Before the mobile station apparatus 1 receives the PHICH in the DL CC-1, the base station apparatus 3 resets the downlink component carrier that transmits the uplink grant for the UL CC-1 to the DL CC-2, and the mobile station apparatus When 1 applies this setting, the mobile station apparatus 1 receives the PHICH for the UL CC-1 by the DL CC-1 and monitors the uplink grant for the UL CC-1 by the DL CC-2. The load of the reception process of the mobile station device 1 increases.

  Therefore, by applying the present invention, before the mobile station apparatus 1 receives the PHICH in the DL CC-1, the base station apparatus 3 transmits the downlink component carrier that transmits the uplink grant for the UL CC-1 to the DL CC-1. When the mobile station apparatus 1 applies this setting, the mobile station apparatus 1 sets ACK to the UL CC-1 HARQ process and performs the reception process of the DL CC-1 PHICH. Therefore, since only the uplink grant of DL CC-2 is monitored, the load of the reception process of the mobile station apparatus 1 can be reduced.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described in detail with reference to the drawings.

  In the second embodiment of the present invention, when all downlink component carriers in which PHICH (HARQ indicator) and PDCCH (uplink grant) for the uplink component carrier are arranged are deactivated, the mobile station device 1 The base station apparatus 3 deletes (flashes) the contents of the HARQ buffer related to the uplink component carrier, and the base station apparatus 3 receives PHICH (HARQ indicator) and PDCCH (uplink grant) for the uplink component carrier. When all the arranged downlink component carriers are deactivated, the mobile station apparatus 1 erases (flashes) the contents of the HARQ buffer related to this uplink component carrier. To determine.

  In addition, when the downlink component carrier with which the uplink grant with respect to a certain uplink component carrier is limited to one, the downlink component carrier with which the HARQ indicator with respect to an uplink component carrier is arrange | positioned was deactivated In some cases, the content of the HARQ buffer related to the uplink component carrier can be expressed as being erased (flushed).

  For example, in FIG. 2, when the mobile station apparatus 1 is set so that the uplink grant for the UL CC-1 is arranged only in the DL CC-1, the UL CC-1 is deactivated when the DL CC-1 is deactivated. Erase the contents of all HARQ buffers associated with -1. For example, in FIG. 2, when it is set that the uplink grant for UL CC-1 is arranged in DL CC-1, DL CC-2, and DL CC-3 for mobile station apparatus 1, the mobile station Device 1 erases the contents of all HARQ buffers associated with UL CC-1 when all of DL CC-1, DL CC-2 and DL CC-3 are deactivated.

  As described above, the mobile station apparatus 1 deletes the content of the HARQ buffer related to the HARQ process that cannot receive the corresponding PHICH (HARQ indicator) and PDCCH (uplink grant), thereby enabling HARQ feedback of the HARQ process. Even if NACK is set, PUSCH is not retransmitted.

  In addition, even if all downlink component carriers in which HARQ indicators and uplink grants for uplink component carriers may be arranged are deactivated, the PUSCH transmission is determined in the HARQ process, but the PUSCH transmission is still performed. If not (when there is a pending PUSCH transmission), the content of the HARQ buffer may be erased after transmitting this PUSCH.

  For example, the mobile station apparatus 1 receives the uplink grant from the time when the uplink grant is received until the PUSCH is transmitted based on the received uplink grant (4 ms, 4 subframes, 4 TTIs). When the link component carrier is deactivated, the content of the HARQ buffer may be deleted after transmitting the PUSCH once. In this way, the PUSCH before being actually transmitted after 4 subframes after receiving PHICH (HARQ indicator) or PDCCH (uplink grant) is referred to as pending PUSCH.

  FIG. 9 is a flowchart showing an example of the operation of the mobile station apparatus 1 according to the second embodiment of the present invention. The mobile station apparatus 1 performs the process of FIG. 9 for each HARQ process. When the process is started, the mobile station apparatus 1 determines whether the downlink component carrier in which PHICH (HARQ indicator) and PDCCH (uplink grant) for the HARQ process related to a certain uplink component carrier are arranged is deactivated. Determination is made (step S200).

  In step S200, the mobile station apparatus 1 determines that all downlink component carriers in which PHICH (HARQ indicator) and PDCCH (uplink grant) for the HARQ process related to a certain uplink component carrier are arranged are deactivated. If so, it is determined whether there is a pending PUSCH transmission (step S201).

  If the mobile station apparatus 1 determines that there is a pending PUSCH transmission in step S201, after transmitting the pending PUSCH (step S202), the HARQ buffer related to this uplink component carrier Is deleted (step S203). If the mobile station apparatus 1 determines in step S201 that there is no pending PUSCH transmission, the mobile station apparatus 1 proceeds to step S203 and deletes the contents of the HARQ buffer related to this uplink component carrier.

  If the mobile station apparatus 1 determines in step S200 that all downlink component carriers in which PHICH (HARQ indicator) and PDCCH (uplink grant) for the HARQ process related to a certain uplink component carrier are arranged have been deactivated. Without performing steps S201 and S202, the transmission of the PUSCH of the uplink component carrier may be canceled in the subsequent subframe, and the content of the HARQ buffer may be erased (step S203). After step S203, the mobile station apparatus 1 ends the process. The mobile station apparatus 1 has at least one downlink component carrier in which PHICH (HARQ indicator) and PDCCH (uplink grant) for the HARQ process related to the uplink component carrier are not deactivated in step S200. If it is determined that there is one, the process is terminated.

  When the wireless communication system according to the second embodiment and the wireless communication system according to the first embodiment are compared, the upper layer processing unit 101 of the mobile station apparatus 1 is different. However, since the configurations and functions of other components are the same as those in the first embodiment, descriptions of the same functions as those in the first embodiment are omitted.

  The HARQ control unit 1013 of the higher layer processing unit 101 of the mobile station apparatus 1 according to the second embodiment performs HARQ when the downlink component carrier in which the PHICH (HARQ indicator) for the uplink component carrier is arranged is deactivated. Do not set ACK as HARQ feedback for process. Then, the HARQ control unit 1013 includes the HARQ storage unit 1015 when all downlink component carriers in which PHICH (HARQ indicator) and PDCCH (uplink grant) are arranged for the uplink component carrier are deactivated. The contents of the HARQ buffer related to the uplink component carrier are deleted.

  Note that the mobile station apparatus 1 may change the timing of erasing the contents of the HARQ buffer according to how the downlink component carrier is deactivated. The mobile station apparatus 1 uses the activation command to notify the downlink component carrier, which is not used for downlink communication, a predetermined time after receiving the activation command (for example, 4 ms, 4 subframes, 4 TTI). When a predetermined time (for example, 100 ms, 100 subframes, 100 TTI) has elapsed since the downlink component carrier was activated by the activation command. A method of deactivating a component carrier, a predetermined time (eg, 10 ms, 10 subframes, 10 TTIs) since the last received PDCCH or PDSCH on an activated downlink component carrier If the spent, a method for de-activating the downlink component carrier (hereinafter, the methods other than deactivated is performed from the reception of the activation command after a predetermined time is referred to as Implicit deactivation.) Is used.

  The base station apparatus 3 notifies the mobile station apparatus 1 of an activation command or maintains the activated state when the downlink component carrier to be deactivated after a predetermined time by the Implicit deactivation is to be maintained in the activated state. The PDCCH or PDSCH is transmitted to the mobile station apparatus 1 on the downlink component carrier to be continued. The mobile station device 1 has a timer that measures the passage of time since activation of the downlink component carrier by the activation command, and the passage of time since the last reception of PDCCH or PDSCH on the activated downlink component carrier. When an activation command is notified or when a PDCCH or PDSCH is received, the timers for the corresponding downlink component carrier are reset. For example, in the case of Explicit deactivation, the mobile station apparatus 1 erases the content of the HARQ buffer when the downlink component carrier is deactivated. In the case of Implicit deactivation, the mobile station apparatus 1 deactivates the downlink component carrier and then performs a predetermined The contents of the HARQ buffer may be erased after a lapse of time.

  Thereby, although the base station apparatus 3 wants to continue the uplink communication (retransmission of PUSCH), the activation command cannot be notified to the mobile station apparatus 1 without error, or PDCCH and PDSCH can be transmitted. Even when the mobile station apparatus 1 cannot properly transmit to the mobile station apparatus 1 and the mobile station apparatus 1 has deactivated the downlink component carrier due to the Implicit deactivation, the mobile station apparatus 1 remains in the HARQ buffer for a predetermined time. Therefore, the base station apparatus 3 activates the downlink component carrier that has been deactivated by using the activation command, and transmits the downlink component carrier that activates the uplink grant that instructs retransmission. By doing so, the PUSCH is transmitted to the mobile station apparatus 1. It can be executed retransmit immediately.

  Thereby, the mobile station apparatus 1 leaves control of the base station apparatus 3 unnecessary when all downlink component carriers that receive PHICH (HARQ indicator) and PDCCH (uplink grant) have been deactivated. Therefore, it is possible to efficiently perform PUSCH retransmission control by avoiding re-transmission of PUSCH.

  The present invention is also applicable to the case where all downlink component carriers receiving PHICH (HARQ indicator) and PDCCH (uplink grant) are excluded from the setting of downlink component carriers used for communication using RRC signals. The same effect can be obtained by applying. That is, when all downlink component carriers that receive PHICH (HARQ indicator) and PDCCH (uplink grant) are excluded from the setting, the mobile station apparatus 1 includes the contents of the HARQ buffer related to the uplink component carrier. Erase.

  In the present invention, the RRC signal is used to set the downlink component carrier in which the PHICH for a certain uplink component carrier is not the downlink component carrier in which the uplink grant for the uplink component carrier is arranged. It may be applied to That is, when the downlink component carrier from which the PHICH is received is excluded from the downlink component carriers in which the uplink grant is arranged, the mobile station apparatus 1 sets ACK to the corresponding HARQ process.

  For example, in FIG. 2, when the downlink component carrier in which the uplink grant for UL CC-1 is transmitted is set as DL CC-1, the mobile station apparatus 1 uses the uplink grant for UL CC-1 and PHICH is received by DL CC-1. Before the mobile station apparatus 1 receives the PHICH in the DL CC-1, the base station apparatus 3 resets the downlink component carrier that transmits the uplink grant for the UL CC-1 to the DL CC-2, and the mobile station apparatus When 1 applies this setting, the mobile station apparatus 1 receives the PHICH for the UL CC-1 on the DL CC-1 and monitors the uplink grant for the UL CC-1 on the DL CC-2. The load of the reception process of the mobile station device 1 increases.

  Therefore, by applying the present invention, before the mobile station apparatus 1 receives the PHICH in the DL CC-1, the base station apparatus 3 transmits the downlink component carrier that transmits the uplink grant for the UL CC-1 to the DL CC-1. -2 is reset, and when the mobile station apparatus 1 applies this setting, the mobile station apparatus 1 deletes the contents of the HARQ buffer related to the HARQ process of the UL CC-1, and the PHICH of the DL CC-1 Since only the uplink grant of DL CC-2 is monitored without performing the receiving process, the load of the receiving process of the mobile station apparatus 1 can be reduced.

  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.

  Moreover, you may implement | achieve part or all of the mobile station apparatus 1 in the embodiment mentioned above and the base station apparatus 3 as LSI which is typically an integrated circuit. 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.

  (A) The present invention can also take the following aspects. 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 communicate with each other using a plurality of downlink component carriers, and an uplink transmitted from the mobile station apparatus to the base station apparatus When the downlink component carrier that receives the HARQ indicator for data is deactivated, the mobile station apparatus sets ACK without receiving the HARQ indicator, and the base station apparatus , It is determined that ACK is set without receiving the HARQ indicator.

  (B) Moreover, the radio | wireless communications system of this invention is a radio | wireless communications system with which a mobile station apparatus and a base station apparatus communicate using a some downlink component carrier, The said mobile station apparatus transmits to the said base station apparatus When the downlink component carrier that receives the HARQ indicator for the uplink data is deactivated, the mobile station apparatus deletes the buffer contents for the uplink data without receiving the HARQ indicator, The base station apparatus determines that the mobile station apparatus has erased the contents of the buffer for the uplink data without receiving the HARQ indicator.

  (C) The mobile station apparatus of the present invention is a mobile station apparatus that communicates with a base station apparatus using a plurality of downlink component carriers, and the mobile station apparatus transmits an uplink transmitted to the base station apparatus. When a downlink component carrier that receives a HARQ indicator for data is deactivated, ACK is set without receiving the HARQ indicator.

  (D) The mobile station apparatus of the present invention is a mobile station apparatus that communicates with a base station apparatus using a plurality of downlink component carriers, and the mobile station apparatus transmits an uplink transmitted to the base station apparatus. When a downlink component carrier that receives a HARQ indicator for data is deactivated, the buffer content for the uplink data is erased without receiving the HARQ indicator.

  (E) Moreover, the base station apparatus of this invention is a base station apparatus which communicates with a mobile station apparatus using a some downlink component carrier, The said base station apparatus is a said base station apparatus. When the downlink component carrier that receives the HARQ indicator for the uplink data transmitted to is deactivated, the mobile station apparatus determines that the ACK is set without receiving the HARQ indicator. Yes.

  (F) Moreover, the base station apparatus of this invention is a base station apparatus which communicates with a mobile station apparatus using a some downlink component carrier, The said base station apparatus is a said base station apparatus. When the downlink component carrier that receives the HARQ indicator for the uplink data transmitted to is deactivated, the mobile station apparatus has erased the contents of the buffer for the uplink data without receiving the HARQ indicator It is characterized by judging.

  (G) The radio communication method of the present invention is a radio communication method used for a mobile station apparatus that communicates with a base station apparatus using a plurality of downlink component carriers, and the uplink transmitted to the base station apparatus In the case where the downlink component carrier that receives the HARQ indicator for data is deactivated, it has means for setting an ACK without receiving the HARQ indicator.

  (H) A radio communication method of the present invention is a radio communication method used for a mobile station apparatus that communicates with a base station apparatus using a plurality of downlink component carriers, and the uplink transmitted to the base station apparatus. When the downlink component carrier that receives the HARQ indicator for the data is deactivated, it has means for erasing the contents of the buffer for the uplink data without receiving the HARQ indicator.

  (I) The radio communication method of the present invention is a radio communication method used for a base station apparatus that communicates with a mobile station apparatus using a plurality of downlink component carriers, and the mobile station apparatus is the base station apparatus. When the downlink component carrier that receives the HARQ indicator for the uplink data transmitted to is deactivated, the mobile station apparatus has means for determining that the ACK is set without receiving the HARQ indicator. It is characterized by.

  (J) The radio communication method of the present invention is a radio communication method used for a base station apparatus that communicates with a mobile station apparatus using a plurality of downlink component carriers, and the mobile station apparatus is the base station apparatus. When the downlink component carrier that receives the HARQ indicator for the uplink data transmitted to is deactivated, the mobile station apparatus has erased the contents of the buffer for the uplink data without receiving the HARQ indicator It has the means to judge that.

  (K) An integrated circuit according to the present invention is an integrated circuit used in a mobile station apparatus that communicates with a base station apparatus using a plurality of downlink component carriers, and for the uplink data transmitted to the base station apparatus. When the downlink component carrier that receives the HARQ indicator is deactivated, it has means for setting ACK without receiving the HARQ indicator.

  (L) An integrated circuit according to the present invention is an integrated circuit used in a mobile station apparatus that communicates with a base station apparatus using a plurality of downlink component carriers, and for the uplink data transmitted to the base station apparatus. When the downlink component carrier that receives the HARQ indicator has been deactivated, it has means for erasing the contents of the buffer for the uplink data without receiving the HARQ indicator.

  (M) The integrated circuit of the present invention is an integrated circuit used in a base station apparatus that communicates with a mobile station apparatus using a plurality of downlink component carriers, and the mobile station apparatus transmits to the base station apparatus. When the downlink component carrier that receives the HARQ indicator for the uplink data is deactivated, the mobile station apparatus has means for determining that the ACK is set without receiving the HARQ indicator. It is said.

  (N) The integrated circuit of the present invention is an integrated circuit used in a base station apparatus that communicates with a mobile station apparatus using a plurality of downlink component carriers, and the mobile station apparatus transmits to the base station apparatus. When the downlink component carrier that receives the HARQ indicator for the uplink data is deactivated, it is determined that the mobile station apparatus has erased the contents of the buffer for the uplink data without receiving the HARQ indicator It has the means to do.

  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 HARQ storage unit 3011 Radio resource control unit 3013 HARQ control unit 3015 HARQ storage unit

Claims (3)

In a radio communication method used for a mobile station apparatus that communicates with a base station apparatus using a plurality of downlink component carriers,
The mobile station device
A part of the downlink component carrier of the plurality of downlink component carriers, according to an instruction of the downlink component carrier to receive the HARQ indicator and deactivated with respect to the uplink data transmitted to the base station apparatus, wherein A radio communication method comprising: deactivating a part of downlink component carriers, and erasing the contents of the HARQ buffer of the uplink component carrier related to the deactivated downlink component carrier . In a mobile station apparatus that communicates with a base station apparatus using a plurality of downlink component carriers,
In accordance with an instruction to deactivate a downlink component carrier that is a part of the plurality of downlink component carriers and that receives a HARQ indicator for uplink data transmitted to the base station apparatus, the part A mobile station apparatus , comprising: deactivating a downlink component carrier of the uplink component carrier; and erasing contents of the HARQ buffer of the uplink component carrier related to the deactivated downlink component carrier . In an integrated circuit used in a mobile station apparatus that communicates with a base station apparatus using a plurality of downlink component carriers,
In accordance with an instruction to deactivate a downlink component carrier that is a part of the plurality of downlink component carriers and that receives a HARQ indicator for uplink data transmitted to the base station apparatus, the part An integrated circuit having a function of deactivating a downlink component carrier of the uplink component carrier and erasing contents of a HARQ buffer of the uplink component carrier related to the deactivated downlink component carrier .

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