Terminal, base station and communication method
A terminal includes: a reception unit configured to receive data according to SPS (Semi persistent scheduling) from a base station; a control unit configured to determine HARQ-ACK (Hybrid automatic repeat request Acknowledgement) feedback information corresponding to the data, wherein transmission of the HARQ-ACK feedback information is required to be postponed until a valid uplink resource is found, configure a HARQ-ACK codebook related to the feedback information, and determine bits of the feedback information by applying the codebook; and a transmission unit configured to transmit the feedback information to the base station. The control unit configures the codebook based on priorities configured to the bits.
1 . A terminal comprising:
a reception unit configured to receive data according to SPS (Semi persistent scheduling) from a base station;
a control unit configured to determine whether or not transmission of HARQ-ACK (Hybrid automatic repeat request Acknowledgement) feedback information corresponding to the data is to be postponed for each of configurations of the SPS and, in a case where transmission of each of a plurality of HARQ-ACK feedback information items corresponding to a plurality of the configurations of the SPS is determined to be postponed, determine a postponed timing for transmitting the plurality of HARQ-ACK feedback information items via an uplink (UL) channel, based on a priority of each of the plurality of HARQ-ACK feedback information items; and
a transmission unit configured to transmit the HARQ-ACK feedback information to the base station at the postponed timing.
2 . The terminal as claimed in claim 1 , wherein
the control unit adds bits of the plurality of HARQ-ACK feedback information items to an end of a HARQ-ACK codebook that is to be transmitted at the postponed timing.
3 . The terminal as claimed in claim 2 , wherein
the control unit determines an order of the bits of the HARQ-ACK feedback information items, corresponding to the data, that are added to the HARQ-ACK codebook, based on a serving cell index, an SPS configuration index, and an SPS slot index.
4 . The terminal as claimed in claim 1 , wherein
the control unit determines an order of the bits of the HARQ-ACK feedback information items, corresponding to the data, that are added to the HARQ-ACK codebook, based on a serving cell index, an SPS configuration index, and an SPS slot index.
5 . A wireless communication system comprising: a terminal; and a base station, wherein
the terminal includes:
a reception unit configured to receive data according to SPS (Semi persistent scheduling) from a base station;
a control unit configured to determine whether or not transmission of HARQ-ACK (Hybrid automatic repeat request Acknowledgement) feedback information corresponding to the data is to be postponed for each of configurations of the SPS, and, in a case where transmission of each of a plurality of HARQ-ACK feedback information items corresponding to a plurality of the configurations of the SPS is determined to be postponed, determine a postponed timing for transmitting the plurality of HARQ-ACK feedback information items via an uplink (UL) channel, based on a priority of each of the plurality of HARQ-ACK feedback information items; and
a transmission unit configured to transmit the HARQ-ACK feedback information to the base station at the postponed timing, and
the base station includes:
a transmission unit configured to transmit data according to SPS (Semi persistent scheduling) to the terminal; and
a reception unit configured to receive the HARQ-ACK feedback information from the terminal.
6 . A communication method performed by a terminal, the communication method comprising:
receiving data according to SPS (Semi persistent scheduling) from a base station;
determining whether or not transmission of HARQ-ACK (Hybrid automatic repeat request Acknowledgement) feedback information corresponding to the data is to be postponed for each of configurations of the SPS and, in a case where transmission of each of a plurality of HARQ-ACK feedback information items corresponding to a plurality of the configurations of the SPS is determined to be postponed, determining a postponed timing for transmitting the plurality of HARQ-ACK feedback information items via an uplink (UL) channel, based on a priority of each of the plurality of HARQ-ACK feedback information items; and
transmitting the HARQ-ACK feedback information to the base station at the postponed timing.