Beam indication method and apparatus, device, and medium
Embodiments of the present invention disclose 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 channel comprises a PDSCH; and
if there is no TCI field in downlink control information DCI for scheduling the PDSCH, a mode of the DCI is a single-DCI mode, and the beam indication information comprises:
TCI state information of a PDCCH on which the DCI is located; or
a plurality of pieces of TCI state information corresponding to a lowest codepoint among codepoints containing a plurality of pieces of TCI state information in a TCI field of the DCI, wherein the plurality of pieces of TCI state information correspond to different TRP identification information; or
if there is no TCI field in DCI for scheduling the PDSCH, a mode of the DCI is a multi-DCI mode, and the beam indication information comprises:
TCI state information of a PDCCH on which the DCI is located;
or
wherein the channel comprises a PDSCH; and the beam indication information comprises:
a plurality of sounding reference signal resource indicators, wherein a plurality of sounding reference signal resources are associated with different TRP identification information; or
one sounding reference signal resource indicator having a plurality of pieces of spatial relation information, wherein the plurality of pieces of spatial relation information are associated with different TRP identification information; or
one sounding reference signal resource indicator having spatial relation information of a plurality of source reference signals, wherein the plurality of source reference signals are associated with different TRP identification information.
2. The method according to claim 1 , wherein when TCI state information is a group of TCI state information of a PDSCH on a second bandwidth part of a second component carrier and activated by a media access control control element, the group of TCI state information is applied to all PDSCHs corresponding to same TRP identification information as the PDSCH, among all component carriers in a component carrier list in which the second component carrier is located.
3. The method according to claim 1 , wherein when the PDCCH is used for cross-carrier scheduling of the PDSCH, and a scheduling offset is less than or equal to a preset offset threshold, TCI state information of the scheduled PDSCH is determined based on TCI state information with a smallest identifier in a group of TCI state information corresponding to preset TRP identification information and activated by the network-side device for the PDSCH.
4. The method according to claim 3 , wherein the preset TRP identification information comprises any one of the following:
TRP identification information corresponding to the scheduled PDSCH;
TRP identification information corresponding to the PDCCH;
TRP identification information having a preset value; and
TRP identification information corresponding to the TCI state information indicated by the DCI of the PDCCH.
5. The method according to claim 1 , further comprising:
selecting one sounding reference signal resource indicator from a plurality of sounding reference signal resource indicators; or
selecting one piece of spatial relation information from one sounding reference signal resource indicator having a plurality of pieces of spatial relation information; or
selecting one source reference signal from one sounding reference signal resource indicator having spatial relation information of a plurality of source reference signals.
6. The method according to claim 1 , wherein the beam indication information further comprises:
TRP identification information.
7. 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 channel comprises a PDSCH; and
if there is no TCI field in downlink control information DCI for scheduling the PDSCH, a mode of the DCI is a single-DCI mode, and the beam indication information comprises:
TCI state information of a PDCCH on which the DCI is located; or
a plurality of pieces of TCI state information corresponding to a lowest codepoint among codepoints containing a plurality of pieces of TCI state information in a TCI field of the DCI, wherein the plurality of pieces of TCI state information correspond to different TRP identification information; or
if there is no TCI field in DCI for scheduling the PDSCH, a mode of the DCI is a multi-DCI mode, and the beam indication information comprises:
TCI state information of a PDCCH on which the DCI is located;
or
wherein the channel comprises a PDSCH; and the beam indication information comprises:
a plurality of sounding reference signal resource indicators, wherein a plurality of sounding reference signal resources are associated with different TRP identification information; or
one sounding reference signal resource indicator having a plurality of pieces of spatial relation information, wherein the plurality of pieces of spatial relation information are associated with different TRP identification information; or
one sounding reference signal resource indicator having spatial relation information of a plurality of source reference signals, wherein the plurality of source reference signals are associated with different TRP identification information.
8. The terminal device according to claim 7 , wherein when TCI state information is a group of TCI state information of a PDSCH on a second bandwidth part of a second component carrier and activated by a media access control control element, the group of TCI state information is applied to all PDSCHs corresponding to same TRP identification information as the PDSCH, among all component carriers in a component carrier list in which the second component carrier is located.
9. The terminal device according to claim 7 , wherein when the PDCCH is used for cross-carrier scheduling of the PDSCH, and a scheduling offset is less than or equal to a preset offset threshold, TCI state information of the scheduled PDSCH is determined based on TCI state information with a smallest identifier in a group of TCI state information corresponding to preset TRP identification information and activated by the network-side device for the PDSCH.
10. The terminal device according to claim 9 , wherein the preset TRP identification information comprises any one of the following:
TRP identification information corresponding to the scheduled PDSCH;
TRP identification information corresponding to the PDCCH;
TRP identification information having a preset value; and
TRP identification information corresponding to the TCI state information indicated by the DCI of the PDCCH.
11. The terminal device according to claim 7 , when the processor executes the computer program, further implementing:
selecting one sounding reference signal resource indicator from a plurality of sounding reference signal resource indicators; or
selecting one piece of spatial relation information from one sounding reference signal resource indicator having a plurality of pieces of spatial relation information; or
selecting one source reference signal from one sounding reference signal resource indicator having spatial relation information of a plurality of source reference signals.
12. The terminal device according to claim 7 , wherein the beam indication information further comprises:
TRP identification information.
13. 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 channel comprises a PDSCH; and
if there is no TCI field in downlink control information DCI for scheduling the PDSCH, a mode of the DCI is a single-DCI mode, and the beam indication information comprises:
TCI state information of a PDCCH on which the DCI is located; or
a plurality of pieces of TCI state information corresponding to a lowest codepoint among codepoints containing a plurality of pieces of TCI state information in a TCI field of the DCI, wherein the plurality of pieces of TCI state information correspond to different TRP identification information; or
if there is no TCI field in DCI for scheduling the PDSCH, a mode of the DCI is a multi-DCI mode, and the beam indication information comprises:
TCI state information of a PDCCH on which the DCI is located;
or
wherein the channel comprises a PDSCH; and the beam indication information comprises:
a plurality of sounding reference signal resource indicators, wherein a plurality of sounding reference signal resources are associated with different TRP identification information; or
one sounding reference signal resource indicator having a plurality of pieces of spatial relation information, wherein the plurality of pieces of spatial relation information are associated with different TRP identification information; or
one sounding reference signal resource indicator having spatial relation information of a plurality of source reference signals, wherein the plurality of source reference signals are associated with different TRP identification information.
14. The network-side device according to claim 13 , wherein when TCI state information is a group of TCI state information of a PDSCH on a second bandwidth part of a second component carrier and activated by a media access control control element, the group of TCI state information is applied to all PDSCHs corresponding to same TRP identification information as the PDSCH, among all component carriers in a component carrier list in which the second component carrier is located.
15. The network-side device according to claim 13 , wherein when the PDCCH is used for cross-carrier scheduling of the PDSCH, and a scheduling offset is less than or equal to a preset offset threshold, TCI state information of the scheduled PDSCH is determined based on TCI state information with a smallest identifier in a group of TCI state information corresponding to preset TRP identification information and activated by the network-side device for the PDSCH.
16. The network-side device according to claim 15 , wherein the preset TRP identification information comprises any one of the following:
TRP identification information corresponding to the scheduled PDSCH;
TRP identification information corresponding to the PDCCH;
TRP identification information having a preset value; and
TRP identification information corresponding to the TCI state information indicated by the DCI of the PDCCH.
17. The network-side device according to claim 13 , when the processor executes the computer program, further implementing:
selecting one sounding reference signal resource indicator from a plurality of sounding reference signal resource indicators; or
selecting one piece of spatial relation information from one sounding reference signal resource indicator having a plurality of pieces of spatial relation information; or
selecting one source reference signal from one sounding reference signal resource indicator having spatial relation information of a plurality of source reference signals.
18. The network-side device according to claim 13 , wherein the beam indication information further comprises:
TRP identification information.