WO2011122191A1

WO2011122191A1 - Wireless communication system, mobile station device, base station device, wireless communication method, and integrated circuit

Info

Publication number: WO2011122191A1
Application number: PCT/JP2011/054356
Authority: WO
Inventors: 翔一鈴木; 大一郎中嶋; 克成上村
Original assignee: シャープ株式会社
Priority date: 2010-03-30
Filing date: 2011-02-25
Publication date: 2011-10-06
Also published as: JP2011211495A

Abstract

In the disclosed wireless communication system, which uses a plurality of downlink component carriers, PUSCH retransmission is efficiently controlled. When a mobile station device (1) determines that conditions are met for a downlink component carrier to be deactivated, the mobile station device (1) determines whether or not there is a possibility of PUSCH retransmission in relation to an uplink grant received through the downlink component carrier. When the mobile station device (1) determines that there is the possibility of PUSCH retransmission, the mobile station device (1) proceeds to the next subframe, and returns to the decision of whether or not there is the possibility of PUSCH retransmission. When the mobile station device (1) determines that there is no possibility of PUSCH retransmission, the downlink component carrier is deactivated. Afterwards, the mobile station device (1) ends processes relating to deactivating the downlink component carrier.

Description

Wireless communication system, mobile station apparatus, base station apparatus, wireless communication method, and integrated circuit

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

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

In LTE, a base station apparatus is a channel for transmitting uplink data (transport block, transport block) using downlink control information (Downlink control information: DCI) transmitted on 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 the success or failure of decoding of the PUSCH 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 the signal by PHICH, the mobile station apparatus sets nothing for the HARQ feedback (holds the HARQ feedback state).

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 PUSCH retransmission, 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 retransmits PUSCH, and when ACK is set for HARQ feedback, the mobile station apparatus does not transmit PUSCH and stores it 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 wireless access method and a wireless 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) ”). In LTE-A, there is 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 LTE-A is considered to use the same channel structure as LTE. ing.

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 a single frequency band (broadband frequency band). (Frequency band aggregation; also called 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 by using an RRC signal (Radio Resource Control Control signal) and the like. It has been proposed that an activation command (activation command) indicating a downlink component carrier used for downlink communication among link component carriers is notified using PDCCH or MAC (Medium Access Control) CE (Control Element). ing. (Non-Patent Document 1)

However, in the conventional technology, in a state where NACK is set in the HARQ feedback related to the PUSCH transmitted in the uplink in the mobile station apparatus, the downlink component carrier for this PUSCH is a downlink component used for downlink communication. When removed from the carrier, the mobile station apparatus repeatedly performs PUSCH retransmission regardless of the success or failure of the PUSCH decoding of the base station apparatus.

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. An object of the present invention is to provide a wireless communication system, a mobile station device, a base station device, a wireless communication method, and an integrated circuit that can be efficiently performed.

(1) In order to achieve the above object, the present invention has taken the following measures. That is, the radio communication system of the present invention is a radio communication system in which a mobile station apparatus and a base station apparatus 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 there is a possibility that retransmission of data will occur, the mobile station device may pending deactivation of a downlink component carrier that receives a HARQ indicator for uplink data transmitted to the base station device, and The apparatus determines that the mobile station apparatus is pending deactivation of a downlink component carrier that receives a HARQ indicator for uplink data transmitted to the base station apparatus.

(2) 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 re-transmission of data is likely to occur, the deactivation of the downlink component carrier that receives the HARQ indicator for the uplink data transmitted to the base station apparatus is pending.

(3) 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 the said base station apparatus. If there is a possibility that retransmission of uplink data transmitted to the mobile station apparatus will occur, the mobile station apparatus will pending deactivation of the downlink component carrier that receives the HARQ indicator for the uplink data transmitted to the base station apparatus. It is characterized by being judged.

(4) 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 a case where there is a possibility that retransmission of data occurs, there is provided a means for pending deactivation of a downlink component carrier that receives a HARQ indicator for uplink data transmitted to the base station apparatus.

(5) Moreover, the radio | wireless communication method of this invention is a radio | wireless communication method used for the base station apparatus which communicates with a mobile station apparatus using a some downlink component carrier, The said mobile station apparatus is the said base station apparatus. If there is a possibility that retransmission of uplink data transmitted to the mobile station apparatus will occur, the mobile station apparatus will pending deactivation of the downlink component carrier that receives the HARQ indicator for the uplink data transmitted to the base station apparatus. It is characterized by being judged.

(6) Moreover, the integrated circuit of 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 If there is a possibility that retransmission will occur, it has a function of pending deactivation of a downlink component carrier that receives a HARQ indicator for uplink data transmitted to the base station apparatus.

(7) 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. If there is a possibility of retransmission of the uplink data, the mobile station device is pending deactivation of the downlink component carrier that receives the HARQ indicator for the uplink data transmitted to the base station device. It has the function to judge.

According to the present invention, in a radio 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 an 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 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 which shows an example of operation | movement of the mobile station apparatus 1 of this invention.

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

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

FIG. 1 shows an uplink reference signal (Uplink Reference Signal: UL 上り RS), physical uplink control channel (Physical Uplink Control Channel) in wireless communication (uplink) from the mobile station devices 1A to 1C to the base station device 3. : PUCCH), physical uplink shared channel (Physical Uplink Shared Channel: PUSCH), and physical random access channel (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 showing an example of the frequency band aggregation processing of 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) having a bandwidth of 20 MHz. It is composed of DL CC-4) subframes. In each subframe of the downlink component carrier, a region where a PHICH indicated by a hatched region with a mesh line is disposed, and a region where a PDCCH indicated by a hatched region with a right-upward diagonal line is disposed. And there is a region where the PDSCH indicated by the non-hatched region 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; Uplink-Component Carrier-1, UL-CC-2, UL-CC-3) having a bandwidth of 20 MHz. . Each of the subframes of the uplink component carrier has a frequency in which a PUCCH indicated by a hatched area with a diagonally downward slanting line and a region in which a PUSCH indicated by a hatched area with a horizontal line are arranged. Is multiplexed.

First, the mobile station apparatus 1 performs initial access with 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 that the mobile station device 1 has made initial access to set the downlink component carrier set for the mobile station device 1. And an 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 to be 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). Note that the MAC-CE is transmitted using PDSCH.

When the base station apparatus 3 notifies the mobile station apparatus 1 that the downlink component carrier is used for downlink communication with an activation command, it 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 called an activated downlink component carrier (activated downlink component carrier) or configured and activated downlink component carrier (configured and activated downlink component carrier) and is deactivated The component carrier is referred to as a deactivated downlink component carrier (deactivated downlink component carrier) or a configured and deactivated downlink component carrier (configured and deactivated downlink component carrier).

The mobile station device 1 may deactivate the downlink component carrier by a method different from the method of deactivating the downlink component carrier notified by the activation command that it 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 device 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 more downlink component carriers among the activated downlink component carriers in the downlink subframe, and Transmit to device 1. The mobile station apparatus 1 performs monitoring and reception processing only on the activated downlink component carrier signals (PDSCH, PDCCH, PHICH, etc.).

The base station apparatus 3 includes a downlink primary component carrier (downlink primary component carrier: DL PCC) and uplink primary component carrier (uplink primary component carrier: UL PCC) among the set downlink component carrier and uplink component carrier. Is set for each mobile station apparatus 1 and an RRC signal including information related to this setting is notified to the mobile station apparatus 1. 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 corresponding to the PU of UL CC-1 is one downlink component carrier (DL CC-1 or DL CC-1) among DL CC-1 to DL CC-4. -2, or DL CC-3 or DL CC-4).

Note that the downlink component carrier that can transmit the PDSCH of the downlink component carrier or the PUSCH of the uplink component carrier can be limited. For example, in FIG. 2, the PDCCH for the UL の CC-1 PUSCH may be limited to be transmitted only on one downlink component carrier among DL-CC1 and DL CC2 for each subframe. Also, the PDCCH for the UL の CC-1 PUSCH may be limited to be transmitted only on the DL CC-1 for each subframe.

The HARQ (Hybrid Automatic Repeat Repeat) reQuest (HARQ) indicator that indicates 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 at DL CC-1 and transmits the PUSCH on the UL CC-1, the HARQ indicator for this PUSCH is 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 (PhysicalPhysResource 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 OFDMs (Orthogonal Frequency 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 (Transmit Time Interval: TITTI). 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. PDCCH is arranged from the OFDM symbol at the head of the subframe (the area hatched with a diagonal line rising to the right 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 communication control, configured in an information format such as downlink assignment (also referred to as downlink assignment) or 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 regarding modulation scheme and coding for PDSCH, information indicating radio resource allocation, information regarding HARQ indicating initial transmission or retransmission, a 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 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.

NDI (New Data Indicator) is included in the information regarding HARQ constituting the downlink assignment and the uplink grant. 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 retransmission. 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.

Described below is a method for encoding downlink control information. First, the base station apparatus 3 adds, to the downlink control information, a sequence obtained by scrambling the cyclic redundancy check (Cyclic Redundancy Check: CRC) code generated based on the downlink control information 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 (the area hatched with a mesh line in FIG. 3). The PHICH may be arranged only in the first OFDM symbol of the subframe, or may be arranged dispersed in a plurality of OFDM symbols. In 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 using the uplink component carrier is transmitted using the PHICH of the downlink component carrier that is the last transmitted uplink grant for this PUSCH. 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 PHICH of a downlink subframe after a predetermined time (for example, 4 ms, 4 subframes, 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). In the PDSCH, a signal of downlink data (or “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 the PDSCH is for which downlink component carrier. 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 showing an example of the 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 (a 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 (Transmit Time Interval: TITTI). 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, the channels allocated in the 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 diagonal lines rising to the right) at both ends of the band of the uplink component carrier. The PUCCH includes communication quality control such as channel quality information (Channel Quality Information) indicating downlink channel quality, a scheduling request (Scheduling Request: SR) indicating a request for allocation of uplink radio resources, and ACK / NACK for the PDSCH. Uplink control information (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; 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 “uplink carrier indicator”) indicating which uplink component carrier the PUSCH is for the uplink component carrier. 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 for explaining the uplink HARQ process of the present invention. In FIG. 5, the horizontal axis is the time domain, a square hatched with a mesh-like line indicates PHICH, a square hatched with an upward slanting diagonal line indicates PDCCH (uplink grant), and a horizontal line hatches. The marked squares indicate PUSCH, and the numbers given to PHICH, PDCCH, and PUSCH indicate the number of the HARQ process 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 corresponding to the PUSCH 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 related to different uplink component carriers can be executed 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 a plurality of uplink data (transport blocks) on one PUSCH using MIMO (Multiple Input Multiple 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 # 0 in the (n + 8) th downlink subframe, and receives this PHICH or PDCCH (uplink grant) 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 n th subframe of the DL －１ 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 DL CC-1 is deactivated before the n + 8th subframe in which the mobile station device 1 receives the PHICH for this PUSCH in the DL CC-1, the mobile station device 1 performs the DL in the n + 8th subframe. Cannot receive PHICH on CC-1. 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 subframe of the DL DL CC-1.

In order to avoid such unnecessary PUSCH retransmission, the present invention takes the following measures. Even if the mobile station apparatus 1 satisfies the condition for deactivating the downlink component carrier, there is a possibility that retransmission of PUSCH (uplink data) transmitted according to the uplink grant received by the downlink component carrier may occur. If there is, it is pending that this downlink component carrier is deactivated, that is, the period during which the downlink component carrier is activated is postponed. In other words, the mobile station apparatus 1 pending that the downlink component carrier that receives the PHICH (HARQ indicator) for the uplink data transmitted to the base station apparatus 3 is deactivated, that is, the downlink component carrier is activated. Extend the period

Even if the base station apparatus 3 satisfies the condition for the downlink component carrier set in the mobile station apparatus 1 to be deactivated, the base station apparatus 3 is transmitted according to the uplink grant received by the downlink component carrier in the mobile station apparatus 1. When there is a possibility that retransmission of PUSCH (uplink data) may occur, the mobile station apparatus 1 has pending that this downlink component carrier is deactivated, that is, the downlink component carrier is activated. Judge that the period has been postponed.

When NACK is set as the HARQ feedback of the HARQ process and uplink data is stored in the HARQ buffer corresponding to the HARQ process, there is a possibility that PUSCH retransmission may occur in this HARQ process. A PUSCH retransmission may occur when a NACK is received in PHICH, or a NACK is set as HARQ feedback in a subframe (timing) corresponding to the HARQ process, or a retransmission is indicated. An uplink grant may be received. The possibility that a PUSCH retransmission may occur is also referred to as a pending PUSCH retransmission.

For example, in FIG. 2, the mobile station apparatus 1 is set so that the uplink grant for UL CC-1 is allocated to DL CC-1 and DL CC-2, and the uplink grant received by DL CC-1 When the conditions for deactivation in both DL-CC-1 and DL-CC-2 are satisfied when there is a possibility that the related PUSCH retransmission may occur, the mobile station apparatus 1 deselects DL-CC-1. Pending activation is performed, DL-CC-2 is deactivated, and PHICH reception and PDCCH blind decoding are performed on DL-CC-1.

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 every downlink component carrier. When the downlink component carrier is activated by an activation command or the like (step S100), the mobile station device 1 determines whether or not the activated downlink component carrier satisfies a deactivation condition for each subframe. (Step S101). If the mobile station apparatus 1 determines in step S101 that the condition for deactivating the downlink component carrier is not satisfied, the mobile station apparatus 1 proceeds to the next subframe (step S102) and returns to step S101.

If the mobile station apparatus 1 determines in step S101 that the condition for deactivating the downlink component carrier is satisfied, there is a possibility that retransmission of PUSCH related to the uplink grant received by this downlink component carrier may occur. It is determined whether or not there is (step S103). If the mobile station apparatus 1 determines in step S103 that there is a possibility of retransmission of PUSCH, the mobile station apparatus 1 proceeds to the next subframe (step S104) and returns to step S103. If the mobile station apparatus 1 determines in step S103 that there is no possibility of PUSCH retransmission, the mobile station apparatus 1 deactivates the downlink component carrier (step S105). The mobile station apparatus 1 ends the process related to deactivating the downlink component carrier after step S105.

As described above, when there is a possibility that PUSCH retransmission may occur, the loop of step S103 and step S104 is delayed, so that the deactivation of the downlink component carrier is postponed. Although omitted in FIG. 6 for simplification of description, when the downlink component carrier is reactivated by the activation command while step S103 and step S104 are looped, the process returns to step S101.

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 the uplink data, the RRC signal, and the MAC-CE generated by a user operation or the like to the transmission unit 107. The upper layer processing unit 101 includes a medium access control (MAC: Medium Access Control) layer, a packet data integration protocol (Packet Data Convergence Protocol: PDCP) layer, a radio link control (Radio Link Control: RLC) layer, and radio resource control. Process the (Radio Resource Control: RRC) layer. Further, upper layer processing section 101 generates control information for controlling receiving section 105 and transmitting section 107 based on downlink control information received by PDCCH, and outputs the control information to control section 103. The radio resource control unit 1011 included in the higher layer processing unit 101 manages various setting information of the own device. For example, the radio resource control unit 1011 manages RNTI such as C-RNTI. 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 in which the downlink assignment for the configured downlink component carrier and the uplink grant for the configured uplink component carrier are arranged. 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.

Even if the radio resource control unit 1011 satisfies the condition for deactivating the downlink component carrier, the retransmission of PUSCH (uplink data) transmitted according to the uplink grant received by the downlink component carrier may occur. If there is a possibility, the fact that this downlink component carrier is deactivated is pending, that is, the period during which the downlink component carrier is activated is postponed.

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 based on the ACK or NACK stored in the HARQ storage unit 1015 and the uplink grant.

The HARQ control unit 1013 associates the HARQ process with the uplink component carrier and subframe number (timing) in which the PUSCH is transmitted. 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 receiving unit 105 and the transmitting unit 107 based on the control information from the higher layer processing unit 101. Control unit 103 outputs the generated control signal to receiving unit 105 and transmitting unit 107 to control receiving unit 105 and transmitting unit 107. The receiving unit 105 separates, demodulates, and decodes the received signal received from the base station apparatus 3 via the transmission / reception antenna 109 according to the control signal input from the control unit 103, and sends the decoded information to the upper layer processing unit 101. Output.

The radio reception unit 1057 converts the downlink signal received via the transmission / reception antenna 109 into an intermediate frequency (down-conversion: 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 (Guard Interval: GI) from the converted digital signal, performs a fast Fourier transform (FFT Fourier Transform: FFT) on the signal from which the guard interval is removed, Extract the region signal.

The demultiplexing unit 1055 separates the extracted signals into PHICH, PDCCH, PDSCH, and downlink reference signals. This separation is performed based on radio resource allocation information notified by 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.

The demodulator 1053 demodulates the PHICH using a BPSK (Binary Phase Shift Keying) modulation method and outputs the demodulated signal to the decoding unit 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.

The demodulation unit 1053 demodulates the modulation scheme notified by downlink assignment such as QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, etc., and outputs the result to the decoding unit 1051. . Decoding section 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 higher layer processing section 101.

The channel measurement unit 1059 measures the downlink path loss and channel state from the downlink reference signal input from the demultiplexing unit 1055, and outputs the measured path loss and channel state to the upper layer processing unit 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 in which the uplink data is notified 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 for identifying the base station device 3 (referred to as physical cell など identity: 識別する PCI, Cell 装置 ID, etc.), 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 in accordance with the control signal input from the control unit 103, and then performs discrete Fourier transform (Discrete Fourier Transform: DFT) to generate the PUCCH and PUSCH signals and the generated uplink reference Multiplex the signal.

The radio transmission unit 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-conversion: up convert), an extra 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: Medium Access Control) layer, a packet data integration protocol (Packet Data Convergence Protocol: PDCP) layer, a radio link control (Radio Link Control: RLC) layer, a radio resource control (Radio). Resource (Control: RRC) layer processing. Further, upper layer processing section 301 generates control information for controlling receiving section 305 and transmitting section 307 and outputs the control information to control section 303. The radio resource control unit 3011 included in the upper layer processing unit 301 generates downlink data (transport block), RRC signal, 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 to be 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 with 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 HARQ control unit 3013 inputs the uplink data (transport block) received by the PUSCH input from the receiving unit 305 to the HARQ buffer, and receives the error detection code (cyclic redundancy check code) added to the uplink data. 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 the uplink signal received via the transmission / reception antenna 309 to an intermediate frequency (down-conversion: 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 (Guard Interval: GI) from the converted digital signal. The radio reception unit 3057 performs fast Fourier transform (FFT Fourier Transform: を FFT) on the signal from which the guard interval is removed, extracts a frequency domain signal, and outputs the signal to the demultiplexing unit 3055.

The demultiplexing unit 3055 demultiplexes the signal input from the radio receiving unit 3057 into signals such as PUCCH, PUSCH, and uplink reference signal. This separation is performed based on radio resource allocation information included in the uplink grant that is determined in advance by the radio resource control unit 3011 by the base station device 3 and notified to each mobile station device 1. 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 demodulator 3053 performs inverse discrete Fourier transform (Inverse Discrete Fourier Transform: IDFT) on the PUSCH, acquires modulation symbols, and performs BPSK (Binary Shift Keying), QPSK, 16QAM, and 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.

Decoding section 3051 encodes the demodulated PUCCH and PUSCH encoded bits in a predetermined encoding scheme, or a coding rate at which the device itself has previously notified mobile station device 1 with an uplink grant. And the decoded uplink data and the uplink control information are output to the higher layer processing unit 301. 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 3059 measures an estimated value of the propagation path, 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 obtains a sequence known by the mobile station device 1 as a downlink reference signal, which is obtained by a predetermined rule based on a physical cell identifier (PCI) for identifying the base station device 3 or the like. Generate. The multiplexing unit 3075 multiplexes each modulated channel and the generated downlink reference signal.

The wireless transmission unit 3077 performs inverse fast Fourier transform (Inverse Fast Fourier Transform: IFFT) on the multiplexed modulation symbols, modulates the OFDM scheme, adds a guard interval to the OFDM symbol that has been OFDM-modulated, and 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-conversion: up convert), the excess frequency component is removed, the power is amplified, and output to the transmission / reception antenna 309 for transmission.

Thus, according to the present invention, in a wireless communication system in which the mobile station apparatus 1 and the base station apparatus 3 communicate using a plurality of downlink component carriers, the PUSCH transmitted from the mobile station apparatus 1 to the base station apparatus 3 When there is a possibility that retransmission for (uplink data) may occur, the mobile station apparatus 1 receives a downlink component carrier for receiving a PHICH (HARQ indicator) for PUSCH (uplink data) transmitted to the base station apparatus 3 Is deactivated, and the base station apparatus 3 receives the PHICH (HARQ indicator) for the PUSCH (uplink data) transmitted from the mobile station apparatus 1 to the base station apparatus 3, and the downlink component carrier is deactivated. It is determined that it is pending .

As a result, the mobile station apparatus 1 keeps the fact that the downlink component carrier that receives the PHICH (HARQ indicator) satisfies the deactivation condition, and is deactivated, and the PHICH (HARQ indicator) and PDCCH (uplink) Since the link grant can be received, the base station apparatus 3 can efficiently control the retransmission of the PUSCH using the PHICH (HARQ indicator) and the PDCCH (uplink grant).

In addition, the mobile station apparatus 1 may switch the process of deactivating a downlink component carrier based on which conditions which deactivate a downlink component carrier were satisfy | filled. The mobile station apparatus 1 is shown to explicitly deactivate the downlink component carrier by the activation command. After receiving the activation command, the mobile station apparatus 1 immediately deactivates the downlink component carrier or receives the activation command. The downlink component carrier is deactivated after a predetermined time elapses (for example, after 4 ms, after 4 subframes, and after 4 TTIs).

When the mobile station apparatus 1 is explicitly instructed by the activation command and deactivates the downlink component carrier, the mobile station apparatus 1 does not apply the present invention, and explicitly indicates that the downlink component carrier is activated. The present invention is applied to the case where the downlink component carrier is deactivated by the mobile station apparatus 1 itself after a predetermined time has elapsed (for example, 100 ms, 100 subframes, 100 TTI) since the activation command is received. When the base station apparatus 1 determines that there is no possibility of retransmission of PUSCH in the uplink component carrier, the base station apparatus 1 explicitly corresponds to the uplink component carrier with an activation command (corresponding PHICH and PDCCH are arranged). Deactivate the downlink component carrier.

When the mobile station apparatus 1 decides to deactivate the downlink component carrier by itself, the mobile station apparatus 1 retransmits the PUSCH (uplink data) transmitted according to the uplink grant received by the downlink component carrier. When the downlink component carrier is deactivated, the PUSCH (uplink data) transmitted according to the uplink grant received by this downlink component carrier is retransmitted. When there is no possibility to do so, the downlink component carrier is deactivated.

In the case where the base station apparatus 3 wants to keep the uplink component carrier and the downlink component carrier corresponding to the uplink component carrier in an activated state in consideration of the possibility of PUSCH retransmission in the uplink component carrier. , An activation command that explicitly indicates that the downlink component carrier is to be activated is transmitted to the mobile station apparatus 1, but this activation command is detected without error in the mobile station apparatus 1 due to the influence of interference, propagation path fluctuation, etc. You may not be able to. In consideration of such a situation, the mobile station apparatus 1 does not perform PUSCH retransmission on the uplink component carrier unless the activation command explicitly indicates that the downlink component carrier is to be deactivated. When there is a possibility of occurrence, the mobile station apparatus 1 can accurately implement the PUSCH re-transmission by postponing the corresponding downlink component carrier being deactivated. Further, the base station apparatus 3 Transmits the activation command again in the activated downlink component carrier, and can continue to maintain the activated state of the downlink component carrier.

FIG. 9 is a flowchart showing an example of the operation of the mobile station apparatus 1 of the present invention. When the flowchart of FIG. 9 is compared with the flowchart of FIG. 6, step S206 hatched with a diagonal line rising to the right is different. However, the configuration and function of the other steps are the same as those in the flowchart of FIG. 6, and thus the description of the same steps as those in the flowchart of FIG. 6 is omitted. In FIG. 9, when the mobile station apparatus 1 determines that the activated downlink component carrier satisfies the condition for deactivation (step S201), the mobile station apparatus 1 further uses the activation command notified from the base station apparatus 3 for the downlink component. It is determined whether it is instructed to deactivate the carrier or whether it is decided to deactivate the downlink component carrier by the mobile station apparatus 1 itself (step S206).

If the mobile station apparatus 1 determines that the mobile station apparatus 1 itself has decided to deactivate in step S206, the PUSCH related to the uplink grant received on this downlink component carrier may be retransmitted. It is determined whether or not there is a property (step S203). If the mobile station apparatus 1 determines that the downlink component carrier is instructed to be deactivated by the activation command notified from the base station apparatus 3 in step S206, the mobile station apparatus 1 deactivates the downlink component carrier (step S205). ).

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 functions as a computer) that controls a CPU (Central Processing Unit) so as to realize the functions of the above-described embodiments related to the present invention. Program). Information handled by these devices is temporarily accumulated 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. The “computer system” here 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.

Further, the “computer-readable recording medium” means a storage device such as a flexible disk, 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.

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

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

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

Claims

In a wireless communication system in which a mobile station apparatus and a base station apparatus communicate using a plurality of downlink component carriers,
When there is a possibility of retransmission for uplink data transmitted by the mobile station device to the base station device,
The mobile station device is pending deactivation of a downlink component carrier that receives a HARQ indicator for uplink data transmitted to the base station device,
The radio communication system, wherein the base station apparatus determines that a deactivation of a downlink component carrier that receives a HARQ indicator for uplink data transmitted from the mobile station apparatus to the base station apparatus is pending. .
In a mobile station apparatus that communicates with a base station apparatus using a plurality of downlink component carriers,
The mobile station device
When there is a possibility that retransmission of uplink data transmitted to the base station apparatus may occur, pending deactivation of a downlink component carrier that receives a HARQ indicator for uplink data transmitted to the base station apparatus A mobile station apparatus characterized by the above.
In a base station apparatus that communicates with a mobile station apparatus using a plurality of downlink component carriers,
The base station device
When there is a possibility that retransmission of uplink data transmitted from the mobile station apparatus to the base station apparatus may occur, the mobile station apparatus receives a HARQ indicator for uplink data transmitted to the base station apparatus. A base station apparatus that judges that deactivation of a link component carrier is pending.
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,
A means for pending deactivation of a downlink component carrier that receives a HARQ indicator for uplink data transmitted to the base station apparatus when there is a possibility of retransmission of the uplink data transmitted to the base station apparatus A wireless communication method comprising:
In a radio communication method used for a base station apparatus that communicates with a mobile station apparatus using a plurality of downlink component carriers,
When there is a possibility that retransmission of uplink data transmitted from the mobile station apparatus to the base station apparatus may occur, the mobile station apparatus receives a HARQ indicator for uplink data transmitted to the base station apparatus. A wireless communication method comprising: determining that deactivation of a link component carrier is pending.
In an integrated circuit used in a mobile station apparatus that communicates with a base station apparatus using a plurality of downlink component carriers,
A function of pending deactivation of a downlink component carrier that receives a HARQ indicator for uplink data transmitted to the base station device when there is a possibility of retransmission of the uplink data transmitted to the base station device An integrated circuit comprising:
In an integrated circuit used in a base station apparatus that communicates with a mobile station apparatus using a plurality of downlink component carriers,
When there is a possibility that retransmission of uplink data transmitted from the mobile station apparatus to the base station apparatus may occur, the mobile station apparatus receives a HARQ indicator for uplink data transmitted to the base station apparatus. An integrated circuit having a function of determining that deactivation of a link component carrier is pending.