Hybrid automatic repeat request HARQ codebook generation method and apparatus
This application provides a hybrid automatic repeat request HARQ codebook generation method and an apparatus. The method includes: A terminal device receives a first message from a network device, where the first message is for scheduling downlink data in a plurality of cells. The terminal device generates a HARQ codebook based on the first message. This application provides the HARQ codebook generation method for a case in which there are a plurality of scheduled cells. According to the foregoing method, transmission performance can be effectively ensured. For example, a transmission opportunity can be effectively increased, or a transmission error caused by poor channel quality can be effectively avoided, so that a flexible and variable service volume and/or communication requirement can be met.
1 . A hybrid automatic repeat request (HARQ) codebook generation apparatus, comprising:
at least one processor; and
a memory having instructions stored thereon that, when executed by the at least one processor, cause the HARQ codebook generation apparatus to:
receive downlink control information (DCI) from a network device, wherein the DCI is used to schedule a first physical downlink shared channel (PDSCH) of a first cell and a second PDSCH of a second cell; and
generate a HARQ codebook based on the DCI,
wherein
the HARQ codebook comprises HARQ information corresponding to the first PDSCH and HARQ information corresponding to the second PDSCH, and the HARQ codebook is organized based on cell indexes of the first cell and the second cell, and
the DCI indicates a total downlink assignment index (T-DAI) and a first counter downlink assignment index (C-DAI) of the first PDSCH of the first cell, a second C-DAI of the second PDSCH of the second cell, and T-DAI applies to the first PDSCH of the first cell and the second PDSCH of the second cell.
2 . The HARQ codebook generation apparatus according to claim 1 , wherein
the HARQ codebook generation apparatus is further caused to:
receive the first PDSCH of the first cell and the second PDSCH of the second cell based on the DCI.
3 . The HARQ codebook generation apparatus according to claim 1 , wherein the HARQ codebook generation apparatus is further caused to:
obtain a physical downlink control channel (PDCCH) monitoring occasion by using a radio resource control (RRC) message; and
receive the DCI on the PDCCH monitoring occasion.
4 . The HARQ codebook generation apparatus according to claim 1 , wherein
the first PDSCH is used for transmitting a first transport block, and the second PDSCH is used for transmitting a second transport block.
5 . A communication apparatus, comprising:
at least one processor; and
a memory having instructions stored thereon that, when executed by the at least one processor, cause the communication apparatus to:
send downlink control information (DCI) to a terminal device, wherein the DCI is used to schedule a first physical downlink shared channel (PDSCH) of a first cell and a second PDSCH of a second cell; and
receive a hybrid automatic repeat request (HARQ) codebook from the terminal device,
wherein
the HARQ codebook comprises HARQ information corresponding to the first PDSCH and HARQ information corresponding to the second PDSCH, and the HARQ codebook is organized based on cell indexes of the first cell and the second cell, and
the DCI indicates a total downlink assignment index (T-DAI) and a first counter downlink assignment index (C-DAI) of the first PDSCH of the first cell, a second C-DAI of the second PDSCH of the second cell, and T-DAI applies to the first PDSCH of the first cell and the second PDSCH of the second cell.
6 . The communication apparatus according to claim 5 , wherein
the communication apparatus is further caused to:
send the first PDSCH of the first cell and the second PDSCH of the second cell to the terminal device based on the DCI.
7 . The communication apparatus according to claim 5 , wherein the communication apparatus is further caused to:
indicate a physical downlink control channel (PDCCH) monitoring occasion to the terminal device by using a radio resource control (RRC) message; and
send the DCI to the terminal device on the PDCCH monitoring occasion.
8 . The communication apparatus according to claim 5 , wherein
the first PDSCH is used for transmitting a first transport block, and the second PDSCH is used for transmitting a second transport block.
9 . A hybrid automatic repeat request (HARQ) codebook generation method, comprising:
receiving downlink control information (DCI) from a network device, wherein the DCI is used to schedule a first physical downlink shared channel (PDSCH) of a first cell and a second PDSCH of a second cell; and
generating a HARQ codebook based on the DCI,
wherein
the HARQ codebook comprises HARQ information corresponding to the first PDSCH and HARQ information corresponding to the second PDSCH, and the HARQ codebook is organized based on cell indexes of the first cell and the second cell, and
the DCI indicates a total downlink assignment index (T-DAI) and a first counter downlink assignment index (C-DAI) of the first PDSCH of the first cell, a second C-DAI of the second PDSCH of the second cell, and T-DAI applies to the first PDSCH of the first cell and the second PDSCH of the second cell.
10 . The HARQ codebook generation method according to claim 9 , wherein
the first PDSCH is used for transmitting a first transport block, and the second PDSCH is used for transmitting a second transport block.
11 . The HARQ codebook generation method according to claim 9 , further comprising:
receiving the first PDSCH of the first cell and the second PDSCH of the second cell based on the DCI.
12 . The HARQ codebook generation method according to claim 9 , further comprising:
obtaining a physical downlink control channel (PDCCH) monitoring occasion by using a radio resource control (RRC) message; and
receiving the DCI on the PDCCH monitoring occasion.