Beam indication method and communications apparatus
This application discloses a beam indication method and a communications apparatus. The method includes: sending configuration information to a terminal device, wherein the configuration information is used to indicate to determine, based on a unified beam indicator, beams used by the terminal device to transmit a plurality of physical channels and/or physical signals; and sending first information to the terminal device; wherein the first information is used to indicate the unified beam indicator; the unified beam indicator is associated with at least one downlink transmission configuration indicator (TCI) state identifier and at least one uplink TCI state identifier; and the downlink TCI state identifier is used to indicate a receive beam of a downlink physical channel, and the uplink TCI state identifier is used to indicate a transmit beam of an uplink physical channel. It can be learned it is helpful to reduce beam indication signaling overheads.
1. A beam indication method performed by an access network device, the method comprising:
sending configuration information to a terminal device, wherein the configuration information is used to indicate, based on a unified beam indicator, one or more beams used by the terminal device to transmit or receive a plurality of physical channels or physical signals, the plurality of physical channels or physical signals comprise one or more downlink physical channels or physical signals and one or more uplink physical channels or physical signals; and
sending first information to the terminal device;
wherein the first information is used to indicate the unified beam indicator;
wherein the unified beam indicator includes a downlink transmission configuration indicator (TCI) state and an uplink TCI state;
wherein the downlink TCI state is used to indicate a receive beam of the one or more beams for receiving the one or more downlink physical channels or physical signals, and the uplink TCI state is used to indicate a transmit beam of the one or more beams for transmitting the one or more uplink physical channels or physical signals; and
wherein the configuration information is further used to indicate the terminal device to transmit the plurality of physical channels or physical signals based on a unified beam.
2. The method according to claim 1 , wherein:
the plurality of physical channels comprise one or more of the following: a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), or a physical uplink control channel (PUCCH); and
the physical signals comprise one or more of the following: a channel state information-reference signal (CSI-RS) or a sounding reference signal (SRS).
3. The method according to claim 1 , wherein:
the first information is downlink control information (DCI) or a medium access control-control element (MAC-CE).
4. The method according to claim 1 , wherein before the configuration information is sent to the terminal device, the method further comprises:
receiving capability information from the terminal device, wherein the capability information is used to indicate that the terminal device supports transmission of the plurality of physical channels or physical signals based on the unified beam.
5. The method according to claim 1 , wherein the receive beam and the transmit beam has a same spatial transmission filter.
6. A beam indication method performed by a terminal device, the method comprising:
receiving configuration information from an access network device, wherein the configuration informations used to indicate, based on a unified beam indicator, one or more beams used by the terminal device to transmit or receive a plurality of physical channels or physical signals, and the plurality of physical channels or physical signals comprise one or more downlink physical channels or physical signals and one or more uplink physical channels or physical signals;
receiving first information from the access network device, wherein the first information is used to indicate the unified beam indicator; and
determining, based on the configuration information and the unified beam indicator, the beams used by the terminal device to transmit the plurality of physical channels or physical signals, wherein:
the unified beam indicator includes a downlink transmission configuration indicator (TCI) state and an uplink TCI state;
the downlink TCI state is used to indicate a receive beam of the one or more beams for receiving the one or more downlink physical channels or physical signals, and the uplink TCI state is used to indicate a transmit beam of the one or more beams for transmitting the one or more uplink physical channels or physical signals; and
the configuration information is further used to indicate the terminal device to transmit the plurality of physical channels or physical signals based on a unified beam.
7. The method according to claim 6 , wherein:
the physical channels comprise one or more of the following: a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), or a physical uplink control channel (PUCCH); and
the physical signals comprise one or more of the following: a channel state information-reference signal (CSI-RS) or a sounding reference signal (SRS).
8. The method according to claim 6 , wherein:
the first information is downlink control information (DCI) or a medium access control-control element (MAC-CE).
9. The method according to claim 6 , wherein before the configuration information is received, the method further comprises:
sending capability information to the access network device, wherein the capability information is used to indicate that the terminal device supports transmission of the plurality of physical channels or physical signals based on the unified beam.
10. The method according to claim 6 , wherein the receive beam and the transmit beam has a same spatial transmission filter.
11. A communications apparatus, comprising:
a receiver, configured to:
receive configuration information from an access network device, wherein the configuration information is used to indicate, based on a unified beam indicator, one or more beams used by a terminal device to transmit or receive a plurality of physical channels or physical signals, and the plurality of physical channels or physical signals comprise one or more downlink physical channels or physical signals and one or more uplink physical channels or physical signals; and
receive first information from the access network device, wherein the first information is used to indicate the unified beam indicator; and
a processor, configured to determine, based on the configuration information and the unified beam indicator, the beams used by the terminal device to transmit the plurality of physical channels or physical signals, wherein:
the unified beam indicator includes a downlink transmission configuration indicator (TCI) state and an uplink TCI state;
the downlink TCI state is used to indicate a receive beam of the one or more beams for receiving the one or more downlink physical channels or physical signals, and the uplink TCI state is used to indicate a transmit beam of the one or more beams for transmitting the one or more uplink physical channels or physical signals; and
the configuration information is further used to indicate the terminal device to transmit the plurality of physical channels or physical signals based on a unified beam.
12. The communications apparatus according to claim 11 , wherein:
the first information is downlink control information (DCI) or a medium access control-control element (MAC-CE).
13. The communications apparatus according to claim 11 , wherein the communications apparatus is the terminal device or a chip of the terminal device.
14. The communications apparatus according to claim 11 , further comprising:
a transmitter, configured to send capability information to the access network device, wherein the capability information is used to indicate that the terminal device supports transmission of the plurality of physical channels or physical signals based on the unified beam.
15. The communications apparatus according to claim 11 , wherein:
the physical channels comprise one or more of the following: a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), or a physical uplink control channel (PUCCH); and
the physical signals comprise one or more of the following: a channel state information-reference signal (CSI-RS) or a sounding reference signal (SRS).
16. A communications apparatus, comprising:
a transmitter, configured to:
send configuration information to a terminal device, wherein the configuration information is used to indicate, based on a unified beam indicator, one or more beams used by the terminal device to transmit or receive a plurality of physical channels or physical signals, the plurality of physical channels or physical signals comprise one or more downlink physical channels or physical signals and one or more uplink physical channels or physical signals; and
send first information to the terminal device;
wherein the first information is used to indicate the unified beam indicator;
wherein the unified beam indicator includes a downlink transmission configuration indicator (TCI) state and an uplink TCI state;
wherein the downlink TCI state is used to indicate a receive beam of the one or more beams for receiving the one or more downlink physical channels or physical signals, and the uplink TCI state is used to indicate a transmit beam of the one or more beams for transmitting the one or more uplink physical channels or physical signals; and
wherein the configuration information is further used to indicate the terminal device to transmit the plurality of physical channels or physical signals based on a unified beam.
17. The communications apparatus according to claim 16 , further comprising:
a receiver, configured to receive capability information from the terminal device, wherein the capability information is used to indicate that the terminal device supports transmission of the plurality of physical channels or physical signals based on the unified beam.
18. The communications apparatus according to claim 16 , wherein:
wherein the communications apparatus is an access network device or a chip of the access network device.
19. The method according to claim 16 , wherein:
the plurality of physical channels comprise one or more of the following: a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), or a physical uplink control channel (PUCCH); and
the physical signals comprise one or more of the following: a channel state information-reference signal (CSI-RS) or a sounding reference signal (SRS).
20. The method according to claim 16 , wherein:
the first information is downlink control information (DCI) or a medium access control-control element (MAC-CE).