Abstract: The present invention is designed so that mismatches in the recognition of TPC command-accumulated values between a radio base station and a user terminal are resolved in a simple way. The user terminal of the present invention provides a user terminal that transmits uplink channels, and that has a receiving section that receives transmission power control (TPC) commands from each of a plurality of cells that are grouped, a control section that controls the uplink channel transmission power of each of the multiple cells based on accumulated values of the TPC commands, and, when a reset condition is fulfilled in one of the multiple cells, the control section resets the accumulated values of all of the multiple cells.

Abstract: A base station used as a first base station in a wireless communication system including the first base station, a second base station that communicates with the first base station, and a user equipment that communicates with the first base station includes: a reception unit that receives a parameter used for generating a downlink physical data channel and data to be transmitted toward the user equipment from the second base station; a generating unit that generates the downlink physical data channel by performing processing of Layer 1 on the data using the parameter; and a transmission unit that transmits the generated downlink physical data channel.

Abstract: A user terminal includes a receiver that receives a downlink shared channel and a processor that obtains a transport block size (TBS) used for the downlink shared channel based on: a TBS index value that is associated with a modulation and coding scheme (MCS) index value used for the downlink shared channel; and a number of resource blocks (RBs) that are allocated to the downlink shared channel. When the downlink shared channel is transmitted by a predetermined transmission scheme and the MCS index value is a predetermined value, the processor modifies the TBS index value associated with the predetermined value and obtains the TBS based on the modified TBS index value and the number of RBs.

Abstract: A user apparatus configured to perform discontinuous reception control for discontinuously receiving a signal transmitted from a base station, including: a reception unit configured to receive information, from the base station, specifying a transmission cycle of a control signal in discontinuous reception performed at a predetermined discontinuous reception cycle; and a transmission control unit configured, when performing the discontinuous reception at the predetermined discontinuous reception cycle, to transmit the control signal in an active period in the discontinuous reception at a cycle longer than the discontinuous reception cycle based on the information specifying the transmission cycle.

Abstract: Even in the case of satellite communications to which LTE is applied, a difference between reception timings of uplink singles transmitted from a plurality of mobile stations UE located in the same cell is kept within GI specified in LTE. A mobile station UE#1 according to the present invention includes: an offset calculation unit 23 configured to calculate an offset ? from a transmission timing to be referenced, based on a distance Lx between the mobile station UE#1 and a satellite 1 used in satellite communications, and a distance Lref between the satellite 1 and a reference mobile station UE; and an RACH functional unit 24 configured to adjust a transmission timing of a random access preamble based on the calculated offset ?.

Abstract: To execute appropriate process when “Time-Switched UL CA” is executed and even when transmission of uplink information using a plurality of CCs has been scheduled in a same TTI. A radio base station eNB according to the present invention includes a UL transmission processing unit 11 configured to transmit uplink information at TTI#n+4 using a CC allocated over a PDCCH to the mobile station UE at TTI#n. The UL transmission processing unit 11 is configured to transmit the uplink information at each of TTIs using only one CC, and when a plurality of CCs is allocated at TTI#n, the UL transmission processing unit 11 is configured to select uplink information to be transmitted at TTI#n+4, based on a priority corresponding to the uplink information to be transmitted using each of the plurality of CCs allocated.

Abstract: A user apparatus configured to perform communication with a base station in a mobile communication system that supports carrier aggregation, including: transmission means configured to transmit, to the base station, the number of layers for each of component carriers that form the carrier aggregation as information of downlink MIMO capability; and reception means configured to receive, from the base station, the number of layers that is used for determining a bit width of a rank indicator for each of the component carriers that form the carrier aggregation.

Abstract: The present invention is designed to optimize the uplink random access procedure even when coverage enhancement is applied to communication by user terminals, in which the bandwidth for use is limited to partial reduced bandwidths in a system bandwidth. A user terminal, in which the bandwidth to use is limited to a partial reduced bandwidth in a system bandwidth, has a receiving section that receives information related to repetitious transmission of a PRACH (Physical Random Access CHannel); and a transmission section that transmits the PRACH in repetitions in part or all of subframes based on the information related to repetitious transmission.

Abstract: A mobile station UE notifies a radio base station of a total amount of data accumulated in a buffer with granularity finer than an LCG. A mobile station UE according to the present invention includes: a management unit 11 configured to manage LCGs and manage DFGs each of which is a group of one or more priorities assigned to one or more data flows; and a transmission unit 13 configured to notify a radio base station eNB of a total amount of data remaining in a buffer for each of combinations of the LCGs and DFGs.

Abstract: In order to control feedback control information in uplink transmission appropriately even when using carrier aggregation in HetNet, the present invention provides a user terminal that is able to communicate with a plurality of radio base stations having overlapping coverage areas by using carrier aggregation, the user terminal comprising: a reception section that receives downlink shared channel signals using component carriers of a primary cell and a secondary cell; a generating section that generates transmission acknowledgement signals in response to the downlink shared channel signals; and an allocating section that allocates the transmission acknowledgement signals to predetermined uplink control channel resources, wherein the allocating section allocates the transmission acknowledgement signals to either or both of uplink control channel resources of the primary cell and uplink control channel resources of the secondary cell in accordance with contents of the transmission acknowledgement signals and/or

Abstract: There is provided a terminal for communicating with a base station apparatus, the terminal including a receiver that receives, from the base station apparatus, instruction information for performing an operation of an error correction process to be executed between the base station apparatus and the terminal, the instruction information including at least one of a process number of a process to be used for the error correction process, a time from receiving a signal until transmitting a reception response, and a timer value indicating a time from receiving the signal until receiving a retransmitted signal; and a processor that executes the error correction process based on the instruction information received by the receiver.

Abstract: A radio communication method of a user terminal and a radio base station adopting carrier aggregation to adequately feed back channel state information of a plurality of cells from a user terminal to a radio base station, is disclosed. The user generates channel state information of each cell in uplink control channel format 2 or in format 3 based on the number of cells to use in carrier aggregation, feeds back the generated channel state information via resources that the radio base station sets in an uplink control channel of a primary cell at a predetermined time in accordance with an uplink control channel format, and the radio base station secures the resources to set in the uplink control channel when the channel state information of the primary cell is generated in uplink control channel format 2, regardless of the number of cells to use in carrier aggregation.

Abstract: The present invention is designed to reduce the power consumption of user terminals more in comparison to conventional DRX control. The present invention provides a receiving section, which receives a DL signal including at least a UL grant, and a DRX control section, which controls the discontinuous reception operations, and the DRX control section, when receiving the DL signal including a UL grant, controls the discontinuous reception operations based on the DRX transition command information that is included in the DL signal. Also, a command for a transition to the discontinuous reception state is transmitted by using downlink control information that includes a UL grant, or a MAC control element.

Abstract: A user apparatus configured to perform discontinuous reception control for discontinuously receiving a signal transmitted from a base station, including: a reception unit configured to receive information, from the base station, specifying a transmission cycle of a control signal in discontinuous reception performed at a predetermined discontinuous reception cycle; and a transmission control unit configured, when performing the discontinuous reception at the predetermined discontinuous reception cycle, to transmit the control signal in an active period in the discontinuous reception at a cycle longer than the discontinuous reception cycle based on the information specifying the transmission cycle.

Abstract: A mobile station which configures a plurality of component carriers to communicate with a base station includes a transmission unit configured to transmit to the base station a terminal capability associated with non-gap measurement indicating whether the mobile station is capable of performing inter-frequency measurement using a radio frequency (RF) chain which is not used for a component carrier; a reception unit configured to receive whether to allow the non-gap measurement from the base station; and a communication control unit configured to control communication according to a gap pattern of using a portion of an inter-frequency measurement duration for data communication, when the non-gap measurement is allowed.

Abstract: A mobile communication method according to the present invention includes executing an RA procedure between a mobile station (UE) and a radio base station (eNB) when the mobile station (UE) in a DRX state makes a return to a non-DRX state in order to perform call origination processing. The method comprises: a step A of causing the radio base station (eNB) in the RA procedure to transmit “Call Identification Request” to the mobile terminal (UE); a step B of causing the mobile terminal (UE) in the RA procedure to notify the radio base station (eNB) of “Call Identification” in response to the “Call Identification Request”; and a step C of causing the radio base station (eNB) in the RA procedure to determine whether to allow the abovementioned return on the basis of the “Call Identification”.

Abstract: A user apparatus in a mobile communication system supporting carrier aggregation includes a measurement unit configured to measure a reception timing difference between component carriers; an information notification unit configured to notify the base station of information on the reception timing difference measured by the measurement unit; and a control unit configured to perform addition or deletion of a secondary cell in the carrier aggregation based on an instruction from the base station that receives the information.

Abstract: The present invention is designed so that mismatches in the recognition of TPC command-accumulated values between a radio base station and a user terminal are resolved in a simple way. The user terminal of the present invention provides a user terminal that transmits uplink channels, and that has a receiving section that receives transmission power control (TPC) commands from each of a plurality of cells that are grouped, a control section that controls the uplink channel transmission power of each of the multiple cells based on accumulated values of the TPC commands, and, when a reset condition is fulfilled in one of the multiple cells, the control section resets the accumulated values of all of the multiple cells.

Abstract: In order to suppress an increase in signal quantity attributed to repetition of transition to a “Preservation state” and return to an “Active state” when multiple applications are operated independently, a mobile station (UE) of the invention includes: a management unit (12) which manages a transmission timing for regular data not involving a user operation in each of multiple applications (#1 to #N); and a transmission unit (13) which transmits a “RRC CONNECTION REQUEST” to a radio access network when the mobile station (UE) transitions from a “Preservation state” to an “Active state.” The transmission unit (13) is configured to adjust a transmission timing for the “RRC CONNECTION REQUEST” based on the transmission timings for the regular data not involving the user operation in the multiple applications (#1 to #N).

Abstract: Provided are a radio communication system, a radio base station and a communication method which enable an inter base-station handover while reducing a processing load on a core network. An eNB 100 sends a handover request which requests an inter base-station handover of a UE 50 from the eNB 100 to an eNB 200 via an inter base-station transmission path. The eNB 200 receives the handover request from the eNB 100, and completes the handover of the UE 50 from the eNB 100 to the eNB 200 by using a communication path to the UE 50 via a highway between an MME 20 and the eNB 100 and the inter base-station transmission path.