PDSCH transmission method and apparatus, device, and storage medium

1 . A physical downlink shared channel (PDSCH) transmission method, applied to a communications device and comprising:

in a case that a physical downlink control channel (PDCCH) occupies multiple transmission occasions and is configured to be associated with control resource sets (CORESETs) of a plurality of different CORESET identifiers (IDs), determining that a resource block (RB) start index of a PDSCH is associated with a location of a lowest RB in a specified CORESET in different CORESETs, wherein the specified CORESET is the one with smallest CORESET ID in a plurality of CORESETs associated with the PDCCH;

in a case that transmission of the PDCCH occupies the multiple transmission occasions, transmitting the PDSCH based on related configuration information of the PDCCH;

wherein in a case that a PDSCH scheduled by the PDCCH is in a first mapping manner, before the transmitting the PDSCH based on related configuration information of the PDCCH, the method further comprises: scheduling the PDSCH in a case that a first start orthogonal frequency division multiplexing (OFDM) symbol on a last transmission occasion among the multiple transmission occasions occupied by the PDCCH in time domain is not after a first start OFDM symbol of the PDSCH.

2 . The PDSCH transmission method according to claim 1 , wherein the PDSCH is scheduled by a downlink control information (DCI) format of any common search space type.

3 . The PDSCH transmission method according to claim 1 , wherein in a case that the PDCCH collides with a time-frequency resource of a PDSCH scheduled by the PDCCH, before the transmitting the PDSCH based on related configuration information of the PDCCH, the method further comprises:

transmitting the PDSCH without occupying the time-frequency resource on which collision occurs, wherein the time-frequency resource is a time-frequency resource of all PDCCH transmission occasions on which collision occurs, and, based on a preset rule, all the PDCCH transmission occasions on which collision occurs are determined by user equipment (UE) according to a PDCCH transmission occasion successfully detected by the UE.

4 . The PDSCH transmission method according to claim 3 , wherein the preset rule is determined based on an association relationship between the successfully detected PDCCH transmission occasion and all the PDCCH transmission occasions on which collision occurs, and the association relationship is determined based on the related configuration information of the PDCCH.

5 . The PDSCH transmission method according to claim 1 , wherein in a case that any front-loaded demodulation reference signal (DMRS) in a PDSCH transmission occasion comprised in a PDSCH scheduled by the PDCCH collides with any CORESET, before the transmitting the PDSCH based on related configuration information of the PDCCH, the method further comprises:

shifting the front-loaded DMRS backward until the front-loaded DMRS does not collide with any CORESET; or

in a case that a CORESET pool index configured for the CORESET that collides with the front-loaded DMRS is different from a CORESET pool index of a CORESET associated with a PDCCH for scheduling a PDSCH transmission occasion of the front-loaded DMRS, not shifting the front-loaded DMRS backward; or

in a case that a TCI state activated by the CORESET that collides with the front-loaded DMRS and a TCI state activated by a CORESET associated with a PDCCH for scheduling a PDSCH transmission occasion of the front-loaded DMRS are not in a same group, or in a case that a TCI state activated by the CORESET that collides with the front-loaded DMRS and a TCI state indicated by a PDSCH transmission occasion of the front-loaded DMRS are not in a same group, not shifting the front-loaded DMRS backward; otherwise, shifting the front-loaded DMRS backward until the front-loaded DMRS does not collide with any CORESET.

6 . The PDSCH transmission method according to claim 5 , wherein after the shifting the front-loaded DMRS backward, the method further comprises:

shifting an additional DMRS corresponding to the front-loaded DMRS backward, wherein a same gap is maintained between the front-loaded DMRS and the corresponding additional DMRS.

7 . The PDSCH transmission method according to claim 6 , wherein after the shifting an additional DMRS corresponding to the front-loaded DMRS backward, the method further comprises:

in a case that the additional DMRS collides with the CORESET, shifting the additional DMRS corresponding to the front-loaded DMRS backward until no collision occurs with any CORESET; or

discarding the additional DMRS in a case that the additional DMRS is shifted beyond a configured time domain symbol of the PDSCH.

8 . A non-transitory readable storage medium, wherein the non-transitory readable storage medium stores a program or an instruction, and the program or the instruction is executed by a processor to implement the steps of the PDSCH transmission method according to claim 2 .

9 . A non-transitory readable storage medium, wherein the non-transitory readable storage medium stores a program or an instruction, and the program or the instruction is executed by a processor to implement the steps of the PDSCH transmission method according to claim 3 .

10 . A communications device, comprising a processor, a memory, and a program or an instruction that is stored in the memory and executable on the processor, wherein the program or the instruction, when executed by the processor, causes the communications device to perform:

in a case that a physical downlink control channel (PDCCH) occupies multiple transmission occasions and is configured to be associated with control resource sets (CORESETs) of a plurality of different CORESET identifiers (IDs), determining that a resource block (RB) start index of a physical downlink shared channel (PDSCH) is associated with a location of a lowest RB in a specified CORESET in different CORESETs, wherein the specified CORESET is the one with smallest CORESET ID in a plurality of CORESETs associated with the PDCCH;

in a case that transmission of the PDCCH occupies the multiple transmission occasions, transmitting the PDSCH based on related configuration information of the PDCCH;

wherein a PDSCH scheduled by the PDCCH is in a first mapping manner, and the program or the instruction, when executed by the processor, causes the communications device to further perform: scheduling the PDSCH in a case that a first start orthogonal frequency division multiplexing (OFDM) symbol on a last transmission occasion among the multiple transmission occasions occupied by the PDCCH in time domain is not after a first start OFDM symbol of the PDSCH.

11 . The communications device according to claim 10 , wherein the PDSCH is scheduled by a downlink control information (DCI) format of any common search space type.

12 . The communications device according to claim 10 , wherein the PDCCH collides with a time-frequency resource of a PDSCH scheduled by the PDCCH; and

the program or the instruction, when executed by the processor, causes the communications device to further perform:

transmitting the PDSCH without occupying the time-frequency resource on which collision occurs, wherein the time-frequency resource is a time-frequency resource of all PDCCH transmission occasions on which collision occurs, and all the PDCCH transmission occasions on which collision occurs are determined by user equipment (UE) based on a preset rule and according to a PDCCH transmission occasion successfully detected by the UE.

13 . The communications device according to claim 12 , wherein the preset rule is determined based on an association relationship between the successfully detected PDCCH transmission occasion and all the PDCCH transmission occasions on which collision occurs, and the association relationship is determined based on the related configuration information of the PDCCH.

14 . The communications device according to claim 10 , wherein any front-loaded demodulation reference signal (DMRS) in a PDSCH transmission occasion comprised in a PDSCH scheduled by the PDCCH collides with any CORESET; and

the program or the instruction, when executed by the processor, causes the communications device to further perform:

shifting the front-loaded DMRS backward until the front-loaded DMRS does not collide with any CORESET; or

in a case that a CORESET pool index configured for the CORESET that collides with the front-loaded DMRS is different from a CORESET pool index of a CORESET associated with a PDCCH for scheduling a PDSCH transmission occasion of the front-loaded DMRS, not shifting the front-loaded DMRS backward; or

in a case that a TCI state activated by the CORESET that collides with the front-loaded DMRS and a TCI state activated by a CORESET associated with a PDCCH for scheduling a PDSCH transmission occasion of the front-loaded DMRS are not in a same group, or in a case that a TCI state activated by the CORESET that collides with the front-loaded DMRS and a TCI state indicated by a PDSCH transmission occasion for scheduling the front-loaded DMRS are not in a same group, not shifting the front-loaded DMRS backward; otherwise, shifting the front-loaded DMRS backward until the front-loaded DMRS does not collide with any CORESET.

15 . The communications device according to claim 14 , wherein the program or the instruction, when executed by the processor, causes the communications device to further perform:

after the front-loaded DMRS is shifted backward, shifting an additional DMRS corresponding to the front-loaded DMRS backward, wherein a same gap is maintained between the front-loaded DMRS and the corresponding additional DMRS.

16 . A non-transitory readable storage medium, wherein the non-transitory readable storage medium stores a program or an instruction, and the program or the instruction is executed by a processor to implement the steps of the PDSCH transmission method according to claim 1 .

17 . A chip, wherein the chip comprises a processor and a communications interface, the communications interface is coupled to the processor, and the processor is configured to run a program or an instruction to implement the steps of the PDSCH transmission method according to claim 1 .

18 . A computer program product, wherein the computer program product is stored in a non-volatile storage medium, and the computer program product is executed by at least one processor to implement the steps of the PDSCH transmission method according to claim 1 .

19 . The communications device according to claim 15 , wherein the program or the instruction, when executed by the processor, causes the communications device to further perform:

after the additional DMRS corresponding to the front-loaded DMRS is shifted backward, in a case that the additional DMRS collides with the CORESET, shifting the additional DMRS corresponding to the front-loaded DMRS backward until no collision occurs with any CORESET.

20 . The communications device according to claim 19 , wherein the program or the instruction, when executed by the processor, causes the communications device to further perform:

after the additional DMRS corresponding to the front-loaded DMRS is shifted backward, discarding the additional DMRS in a case that the additional DMRS is shifted beyond a configured time domain symbol of the PDSCH.