Method and apparatus for transmitting and receiving data in a wireless communication system

Patent metadata

Field	Value
Publication number	US-2022217756-A1
Application number	US-202017609943-A
Country	US
Kind code	A1
Filing date	May 15, 2020
Priority date	May 17, 2019
Publication date	Jul 7, 2022
Grant date	—

Abstract

A terminal and a base station in a wireless communication system and a method performed by the terminal and the base station are disclosed. According to an embodiment, the method performed by the terminal in the wireless communication system comprises: receiving a physical downlink control channel (PDCCH), the PDCCH including downlink control information (DCI) for scheduling one or more physical downlink shared channels (PDSCHs); receiving the PDSCHs according to the DCI; and transmitting a hybrid automatic repeat request acknowledgement (HARQ-ACK/NACK) codebook for the PDSCHs.

First claim

1 . A method performed by a terminal in a wireless communication system, the method comprising:
receiving a physical downlink control channel (PDCCH), the PDCCH including downlink control information (DCI) for scheduling one or more physical downlink shared channels (PDSCHs); receiving the PDSCHs according to the DCI; and transmitting a hybrid automatic repeat request acknowledgement (HARQ-ACK/NACK) codebook for the PDSCHs.

2 . The method of claim 1 , wherein the DCI comprises a downlink assignment index (DAI); and
wherein, where one DCI schedules a plurality of PDSCHs, the DAI indicates information on a first PDSCH of the plurality of PDSCHs, or indicates information on a last PDSCH of the plurality of PDSCHs.

3 . The method of claim 1 , wherein the DCI comprises a downlink assignment index (DAI); and
wherein, where a plurality of PDSCHs scheduled by one PDCCH belong to one or more PDSCH groups, the DAI includes one or more DAI bit fields, and each of the DAI bit fields respectively corresponds to DAI information of one PDSCH group.

4 . The method of claim 1 , the method further comprises:
grouping, for a plurality of PDSCHs that are fed back in the HARQ-ACK/NACK codebook, the PDSCHs according to a DCI format of the DCI for scheduling each of the PDSCHs, wherein PDSCHs scheduled by DCI of a given DCI format belong to a given PDSCH group; and determining the codebook for each PDSCH group.

5 . The method of claim 1 , the method further comprises:
grouping, for a plurality of PDSCHs that are fed back in the HARQ-ACK/NACK codebook, the PDSCHs according to a number of PDSCHs scheduled by each DCI for scheduling the plurality of PDSCHs; wherein a PDSCH scheduled by such DCI that schedules PDSCHs of a number greater than a threshold value, and a PDSCH scheduled by such DCI that schedules PDSCHs, a number of which is less than or equal to the threshold value, belong to different PDSCH groups; and determining the codebook for each PDSCH group.

6 . The method of claim 1 , the method further comprises:
grouping, for a plurality of PDSCHs that are fed back in a HARQ-ACK/NACK codebook, the PDSCHs according to a transmission granularity, wherein PDSCHs having a given transmission granularity belong to a given PDSCH group, and PDSCHs having different transmission granularityities belong to different PDSCH groups, or PDSCHs having different granularityities belong to a given PDSCH group determined according to a transmission granularity of a reference PDSCH; and determining the codebook for each PDSCH group.

7 . The method of claim 1 , wherein the DCI comprises a downlink assignment index (DAI) for counting the PDCCHs, and wherein a number of bits of a HARQ-ACK/NACK corresponding to one PDCCH N t =N max_p ×N max_pdsch and a total number of bits of the sent HARQ-ACK/NACK codebook M×N t =M×N max_p ×N max_pdsch , where N max_p is a number of bits of a HARQ-ACK/NACK of each PDSCH, N max_pdsch is a maximum number of PDSCHs scheduled by the one PDCCH and belonging to a given PDSCH group and M is a value of the DAI in the PDSCH group.

8 . The method of claim 1 , wherein the DCI comprises a downlink assignment index (DAI) for counting the PDSCHs, the DAI indicates information on a last PDSCH of the PDSCHs scheduled by the DCI, and wherein a total number of bits of the sent HARQ-ACK/NACK codebook is M×N max_p , where N max_p is a number of bits of a HARQ-ACK/NACK of each PDSCH and M is a value of the DAI in a PDSCH group.

9 . The method of claim 1 , wherein the DCI comprises a downlink assignment index (DAI) for counting the PDCCHs, and,
wherein a total number of bits of the sent HARQ-ACK/NACK codebook is M×N t , where M is a value of the DAI in a PDSCH group and N t is a number of bits of a HARQ-ACK/NACK corresponding to one PDCCH, and wherein N t is predefined or semi-statically configured, and N t is not less than a sum Σ i=0 X Ni of numbers of bits of the HARQ-ACK/NACKs of the PDSCHs scheduled by the one PDCCH, wherein Ni is a number of bits of the HARQ-ACK/NACK of an i-th PDSCH scheduled by the one PDCCH.

10 . The method of claim 1 , wherein the DCI comprises zero power channel state information reference signal (ZP CSI-RS) information,
wherein, where one DCI schedules a plurality of PDSCHs, the method further comprises: performing rate matching on the plurality of PDSCHs according to the ZP CSI-RS information.

11 . The method of claim 1 , wherein the DCI comprises control channel resource set (CORESET) information,
wherein, for DCI for scheduling the plurality of PDSCHs, the CORESET information comprises a plurality of CORESETs.

12 . The method of claim 1 , wherein the receiving the PDSCHs according to the DCI further comprises: receiving a demodulation reference signal (DMRS) of the PDSCHs according to the DCI, and receiving the PDSCHs according to the DMRS,
wherein the DCI indicates a pattern of the DMRS, and the pattern of the DMRS comprises one or more of period information, time offset information, a duration and a symbol index; and/or wherein the DCI indicates position information on the DMRS, and the position information on the DMRS is determined by time domain information on each PDSCH; or the position information on the DMRS is determined by time domain information on all PDSCHs scheduled by DCI of one PDCCH.

13 . A method performed by a base station in a wireless communication system, comprising:
transmiting a physical downlink control channel (PDCCH), the PDCCH including downlink control information (DCI) for scheduling one or more physical downlink shared channels (PDSCHs); transmiting the PDSCHs according to the DCI; and receiving a hybrid automatic repeat request acknowledgement (HARQ-ACK/NACK) codebook for the PDSCHs.

14 . The method of claim 13 , wherein the DCI comprises a downlink assignment index (DAI), and in a situation where one DCI schedules a plurality of PDSCHs, the DAI indicates information on a first PDSCH of the plurality of PDSCHs, or indicates information on a last PDSCH of the plurality of PDSCHs.

15 . A terminal in a wireless communication system, the terminal comprising:
a transceiver; a memory configured to store at least one instruction; and a processor configured to: receive a physical downlink control channel (PDCCH), the PDCCH including downlink control information (DCI) for scheduling one or more physical downlink shared channels (PDSCHs); receive the PDSCHs according to the DCI; and transmit a hybrid automatic repeat request acknowledgement (HARQ-ACK/NACK) codebook for the PDSCHs.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Wu Min
• Fu Jingxing
• Wang Yi
• Sun Feifei
• Yu Bin

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04W72/232

  the control data signalling from the physical layer, e.g. DCI signalling · CPC title

• H04L1/1864

  ARQ related signaling (H04L1/1607 takes precedence) · CPC title

• H04L1/1861 Primary

  Physical mapping arrangements (for ACK signaling see also H04L5/0053) · CPC title