Terminal and communication method
A terminal includes: a reception unit configured to receive control information and data from a base station; a control unit configured to determine a carrier for transmitting an uplink control channel, based on the control information; and a transmission unit configured to transmit information related to retransmission control of the data in the determined carrier. The control unit configures an activation timing and a deactivation timing of the determined carrier.
1 . A terminal comprising:
a reception unit configured to receive RRC (Radio Resource Control) signaling and a PDSCH (Physical Downlink Shared Channel) from a base station, the RRC signaling specifying a cell as a transmission destination cell of a PUCCH (Physical Uplink Control Channel), the cell being different from a primary cell and a subcarrier spacing (SCS) of the cell being different from an SCS of the primary cell;
a control unit configured to determine the cell that is different from the primary cell as a transmission destination cell of the PUCCH, based on the RRC signaling; and
a transmission unit configured to transmit information related to retransmission control corresponding to the PDSCH to the base station in the transmission destination cell of the PUCCH,
wherein the control unit stores an accumulated value of closed loop power control for each cell in transmission power control in the transmission destination cell of the PUCCH, and
wherein in a case where a plurality of cells can be used as a transmission destination cell of the PUCCH, a priority order between the plurality of the cells is specified in advance.
2 . The terminal as claimed in claim 1 , wherein the transmission unit transmits, to the base station, a terminal capability indicating whether or not PUCCH cell switching according to the RRC signaling is supported.
3 . A communication system comprising: a terminal; and a base station, wherein
the terminal includes:
a reception unit configured to receive RRC (Radio Resource Control) signaling and a PDSCH (Physical Downlink Shared Channel) from a base station, the RRC signaling specifying a cell as a transmission destination cell of a PUCCH (Physical Uplink Control Channel), the cell being different from a primary cell and a subcarrier spacing (SCS) of the cell being different from an SCS of the primary cell;
a control unit configured to determine the cell that is different from the primary cell as a transmission destination cell of the PUCCH, based on the RRC signaling; and
a transmission unit configured to transmit information related to retransmission control corresponding to the PDSCH to the base station in the transmission destination cell of the PUCCH,
wherein the control unit stores an accumulated value of closed loop power control for each cell in transmission power control in the transmission destination cell of the PUCCH, and
wherein in a case where a plurality of cells can be used as a transmission destination cell of the PUCCH, a priority order between the plurality of the cells is specified in advance, and
the base station includes:
a transmission unit configured to transmit the RRC signaling and the PDSCH to the terminal;
a control unit configured to assume that the cell that is different from the primary cell is to be a transmission destination cell of the PUCCH, based on the RRC signaling; and
a reception unit configured to receive information related to retransmission control corresponding to the PDSCH in the transmission destination cell of the PUCCH from the terminal.
4 . A communication method performed by a terminal, the communication method comprising:
receiving RRC (Radio Resource Control) signaling and a PDSCH (Physical Downlink Shared Channel) from a base station, the RRC signaling specifying a cell as a transmission destination cell of a PUCCH (Physical Uplink Control Channel), the cell being different from a primary cell and a subcarrier spacing (SCS) of the cell being different from an SCS of the primary cell;
determining the cell that is different from the primary cell as a transmission destination cell of the PUCCH, based on the RRC signaling;
transmitting information related to retransmission control corresponding to the PDSCH to the base station in the transmission destination cell of the PUCCH; and
storing an accumulated value of closed loop power control for each cell in transmission power control in the transmission destination cell of the PUCCH,
wherein in a case where a plurality of cells can be used as a transmission destination cell of the PUCCH, a priority order between the plurality of the cells is specified in advance.