Beam indication method and apparatus, device, and medium
A beam indication method and apparatus, a device, and a medium. The method includes: receiving beam indication information transmitted by a network-side device, where the beam indication information is used to indicate a plurality of pieces of beam information of a channel or a reference signal, and the plurality of pieces of beam information correspond to different transmission and reception point TRP identification information; and transmitting the channel or the reference signal according to the beam indication information.
1. A beam indication method, comprising:
receiving beam indication information transmitted by a network-side device, wherein the beam indication information is used to indicate a plurality of pieces of beam information of a channel or a reference signal, and the plurality of pieces of beam information correspond to different transmission and reception point TRP identification information; and
transmitting the channel or the reference signal according to the beam indication information;
wherein the reference signal comprises the CSI-RS; and before the transmitting the channel or the reference signal according to the beam indication information, the method further comprises:
if the CSI-RS is an aperiodic CSI-RS, and a scheduling offset between DCI and the aperiodic CSI-RS is less than or equal to a preset offset threshold, and there is another downlink signal on a symbol on which the CSI-RS is located, determining TCI state information of the CSI-RS based on TCI state information of the another downlink signal;
or,
wherein the reference signal comprises the SRS; and the beam indication information comprises:
a plurality of pieces of spatial relation information, wherein the plurality of pieces of spatial relation information correspond to different TRP identification information.
2. The method according to claim 1 , wherein if the another downlink signal is a PDSCH, a mode of the DCI is a single-DCI mode; and
the determining TCI state information of the CSI-RS based on TCI state information of the another downlink signal comprises any one of the following:
determining that TCI state information of the PDSCH corresponding to same TRP identification information as the TCI state information of the CSI-RS is the TCI state information of the CSI-RS;
determining that TCI state information of the PDSCH corresponding to same TRP identification information as a source reference signal in the TCI state information of the CSI-RS is the TCI state information of the CSI-RS;
determining that TCI state information of the PDSCH corresponding to same TRP identification information as the PDCCH triggering the CSI-RS is the TCI state information of the CSI-RS; or
determining that default TCI state information in a group of TCI state information corresponding to preset TRP identification information is the TCI state information of the CSI-RS.
3. The method according to claim 2 , wherein the default TCI state information comprises:
TCI state information having a preset TCI state identifier;
wherein the preset TRP identification information comprises:
TRP identification information corresponding to the PDSCH; or
TRP identification information corresponding to the PDCCH; or
TRP identification information corresponding to the TCI state information of the CSI-RS.
4. The method according to claim 1 , wherein if the another downlink signal is a PDSCH, a mode of the DCI is a multi-DCI mode; and
the determining TCI state information of the CSI-RS based on TCI state information of the another downlink signal comprises:
determining the TCI state information of the CSI-RS based on TCI state information of the PDSCH corresponding to preset TRP identification information;
wherein the preset TRP identification information comprises:
TRP identification information corresponding to the PDSCH; or
TRP identification information corresponding to the PDCCH for scheduling the PDSCH; or
TRP identification information corresponding to the TCI state information of the CSI-RS.
5. The method according to claim 1 , wherein if the another downlink signal is a periodic CSI-RS or a semi-persistent CSI-RS or another aperiodic CSI-RS with an effective TCI state,
the determining TCI state information of the CSI-RS based on TCI state information of the another downlink signal comprises:
if the CSI-RS corresponds to same TRP identification information as the another downlink signal, determining the TCI state information of the CSI-RS based on the TCI state information of the another downlink signal; or
if the CSI-RS and the another downlink signal correspond to different TRP identification information, determining the TCI state information of the CSI-RS based on the TCI state information of the another downlink signal or default TCI state information corresponding to same TRP identification information as the CSI-RS.
6. The method according to claim 1 , wherein when the TCI state information is TCI state information of a CSI-RS on a fourth bandwidth part of a fourth component carrier indicated by the network-side device, the TCI state information is applied to all CSI-RSs corresponding to same TRP identification information as the CSI-RS, among all component carriers in a component carrier list in which the fourth component carrier is located; or the TCI state information is applied to a CSI-RS having a same CSI-RS resource index and corresponding to same TRP identification information as the CSI-RS, among all component carriers in a component carrier list in which the fourth component carrier is located.
7. The method according to claim 1 , wherein when the spatial relation information is spatial relation information of an SRS on a fifth bandwidth part of a fifth component carrier and activated by a media access control control element, the spatial relation information is applied to all SRSs corresponding to same TRP identification information as the SRS, among all component carriers in a component carrier list in which the fifth component carrier is located; or the spatial relation information is applied to an SRS having a same SRS resource index and corresponding to same TRP identification information as the SRS, among all component carriers in a component carrier list in which the fifth component carrier is located.
8. The method according to claim 1 , further comprising:
if the beam indication information does not comprise spatial relation information of the SRS, determining the spatial relation information of the SRS based on default TCI state information or quasi-co-location information corresponding to preset TRP identification information.
9. The method according to claim 8 , wherein the default TCI state information or the quasi-co-location information comprises:
TCI state information or quasi-co-location information of a control resource set having a smallest control resource set identifier and corresponding to the preset TRP identification information; or
TCI state information having a smallest TCI state identifier in a group of activated TCI state information corresponding to the preset TRP identification information; or
TCI state information corresponding to a lowest codepoint in a TCI field of DCI; or
TCI state information corresponding to a lowest codepoint among codepoints containing one piece of TCI state information in a TCI field of DCI; or
TCI state information corresponding to a lowest codepoint among codepoints containing a plurality of pieces of TCI state information in a TCI field of DCI.
10. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, wherein
when the processor executes the computer program, the following steps are implemented:
receiving beam indication information transmitted by a network-side device, wherein the beam indication information is used to indicate a plurality of pieces of beam information of a channel or a reference signal, and the plurality of pieces of beam information correspond to different transmission and reception point TRP identification information; and
transmitting the channel or the reference signal according to the beam indication information;
wherein the reference signal comprises the CSI-RS; and before the transmitting the channel or the reference signal according to the beam indication information, the method further comprises:
if the CSI-RS is an aperiodic CSI-RS, and a scheduling offset between DCI and the aperiodic CSI-RS is less than or equal to a preset offset threshold, and there is another downlink signal on a symbol on which the CSI-RS is located, determining TCI state information of the CSI-RS based on TCI state information of the another downlink signal;
or,
wherein the reference signal comprises the SRS; and the beam indication information comprises:
a plurality of pieces of spatial relation information, wherein the plurality of pieces of spatial relation information correspond to different TRP identification information.
11. The terminal device according to claim 10 , wherein if the another downlink signal is a PDSCH, a mode of the DCI is a single-DCI mode; and
the determining TCI state information of the CSI-RS based on TCI state information of the another downlink signal comprises any one of the following:
determining that TCI state information of the PDSCH corresponding to same TRP identification information as the TCI state information of the CSI-RS is the TCI state information of the CSI-RS;
determining that TCI state information of the PDSCH corresponding to same TRP identification information as a source reference signal in the TCI state information of the CSI-RS is the TCI state information of the CSI-RS;
determining that TCI state information of the PDSCH corresponding to same TRP identification information as the PDCCH triggering the CSI-RS is the TCI state information of the CSI-RS; or
determining that default TCI state information in a group of TCI state information corresponding to preset TRP identification information is the TCI state information of the CSI-RS.
12. The terminal device according to claim 11 , wherein the default TCI state information comprises:
TCI state information having a preset TCI state identifier;
wherein the preset TRP identification information comprises:
TRP identification information corresponding to the PDSCH; or
TRP identification information corresponding to the PDCCH; or
TRP identification information corresponding to the TCI state information of the CSI-RS.
13. The terminal device according to claim 10 , further comprising:
if the beam indication information does not comprise spatial relation information of the SRS, determining the spatial relation information of the SRS based on default TCI state information or quasi-co-location information corresponding to preset TRP identification information.
14. The terminal device according to claim 13 , wherein the default TCI state information or the quasi-co-location information comprises:
TCI state information or quasi-co-location information of a control resource set having a smallest control resource set identifier and corresponding to the preset TRP identification information; or
TCI state information having a smallest TCI state identifier in a group of activated TCI state information corresponding to the preset TRP identification information; or
TCI state information corresponding to a lowest codepoint in a TCI field of DCI; or
TCI state information corresponding to a lowest codepoint among codepoints containing one piece of TCI state information in a TCI field of DCI; or
TCI state information corresponding to a lowest codepoint among codepoints containing a plurality of pieces of TCI state information in a TCI field of DCI.
15. The method according to claim 10 , wherein if the another downlink signal is a PDSCH, a mode of the DCI is a multi-DCI mode; and
the determining TCI state information of the CSI-RS based on TCI state information of the another downlink signal comprises:
determining the TCI state information of the CSI-RS based on TCI state information of the PDSCH corresponding to preset TRP identification information;
wherein the preset TRP identification information comprises:
TRP identification information corresponding to the PDSCH; or
TRP identification information corresponding to the PDCCH for scheduling the PDSCH; or
TRP identification information corresponding to the TCI state information of the CSI-RS.
16. A network-side device, comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, wherein
when the processor executes the computer program, the following steps are implemented:
transmitting beam indication information to a terminal device, so that the terminal device transmits a channel or a reference signal according to the beam indication information, wherein the beam indication information is used to indicate a plurality of pieces of beam information of the channel or the reference signal, and the plurality of pieces of beam information correspond to different TRP identification information;
wherein the reference signal comprises the CSI-RS;
if the CSI-RS is an aperiodic CSI-RS, and a scheduling offset between DCI and the aperiodic CSI-RS is less than or equal to a preset offset threshold, and there is another downlink signal on a symbol on which the CSI-RS is located, TCI state information of the CSI-RS is determined based on TCI state information of the another downlink signal;
or,
wherein the reference signal comprises the SRS; and the beam indication information comprises:
a plurality of pieces of spatial relation information, wherein the plurality of pieces of spatial relation information correspond to different TRP identification information.
17. The network-side device according to claim 16 , wherein if another downlink signal is a PDSCH, a mode of the DCI is a single-DCI mode; and
the determining TCI state information of the CSI-RS based on TCI state information of the another downlink signal comprises any one of the following:
determining that TCI state information of the PDSCH corresponding to same TRP identification information as the TCI state information of the CSI-RS is the TCI state information of the CSI-RS;
determining that TCI state information of the PDSCH corresponding to same TRP identification information as a source reference signal in the TCI state information of the CSI-RS is the TCI state information of the CSI-RS;
determining that TCI state information of the PDSCH corresponding to same TRP identification information as the PDCCH triggering the CSI-RS is the TCI state information of the CSI-RS; or
determining that default TCI state information in a group of TCI state information corresponding to preset TRP identification information is the TCI state information of the CSI-RS.
18. The network-side device according to claim 17 , wherein the default TCI state information comprises:
TCI state information having a preset TCI state identifier;
wherein the preset TRP identification information comprises:
TRP identification information corresponding to the PDSCH; or
TRP identification information corresponding to the PDCCH; or
TRP identification information corresponding to the TCI state information of the CSI-RS.
19. The network-side device according to claim 16 , further comprising: if the beam indication information does not comprise spatial relation information of the SRS, the spatial relation information of the SRS is determined based on default TCI state information or quasi-co-location information corresponding to preset TRP identification information.
20. The network-side device according to claim 19 , wherein the default TCI state information or the quasi-co-location information comprises:
TCI state information or quasi-co-location information of a control resource set having a smallest control resource set identifier and corresponding to the preset TRP identification information; or
TCI state information having a smallest TCI state identifier in a group of activated TCI state information corresponding to the preset TRP identification information; or
TCI state information corresponding to a lowest codepoint in a TCI field of DCI; or
TCI state information corresponding to a lowest codepoint among codepoints containing one piece of TCI state information in a TCI field of DCI; or
TCI state information corresponding to a lowest codepoint among codepoints containing a plurality of pieces of TCI state information in a TCI field of DCI.