Channel reciprocity for a multi-panel base station
Aspects of the disclosure relate to communication using a multi-panel base station. In an aspect, a base station may determine a plurality of indicators identifying a plurality of antenna panels on the base station, wherein each indicator of the plurality of indicators identifies a respective antenna panel of the plurality of antenna panels. Further, the base station may transmit the plurality of indicators to a user equipment (UE) to respectively identify the plurality of antenna panels.
1. A base station for wireless communication, comprising:
at least one processor;
a transceiver communicatively coupled to the at least one processor; and
a memory communicatively coupled to the at least one processor,
wherein the at least one processor is configured to:
transmit a plurality of indicators identifying a plurality of antenna panels on the base station to a user equipment (UE), wherein each indicator of the plurality of indicators identifies a respective panel of the plurality of antenna panels of the base station;
communicate with the UE based on the plurality of indicators of the plurality of antenna panels;
identify one or more sounding reference signal (SRS) resources, wherein transmitting the plurality of indicators comprises transmitting resource information indicating the one or more SRS resources, each SRS resource of the one or more SRS resources being associated with at least one indicator of the plurality of indicators identifying at least one respective antenna panel of the plurality of antenna panels; and
receive a plurality of sounding reference signals (SRSs) from the UE via the plurality of antenna panels on the one or more SRS resources.
2. The base station of claim 1 , wherein the at least one processor configured to transmit the resource information indicating the one or more SRS resources is configured to:
transmit an SRS resource configuration of the one or more SRS resources.
3. The base station of claim 2 , wherein the one or more SRS resources include a plurality of SRS resources and the SRS resource configuration is associated with an SRS resource set comprising the plurality of SRS resources that are respectively associated with the plurality of antenna panels.
4. The base station of claim 2 , wherein the at least one processor configured to transmit the SRS resource configuration is configured to:
transmit the SRS resource configuration in response to panel switching of the plurality of antenna panels.
5. The base station of claim 1 , wherein the one or more SRS resources include at least one SRS resource that is repeatedly used for a plurality of SRS transmissions, each of the plurality of SRS transmissions using the at least one SRS resource associated with a respective indicator of the at least one indicator identifying a respective antenna panel of the plurality of antenna panels.
6. The base station of claim 1 , wherein the one or more SRS resources include a plurality of SRS resources, each comprising a single respective indicator of the plurality of indicators identifying a single antenna panel of the plurality of antenna panels.
7. The base station of claim 1 , wherein:
panel switching associated with the plurality of antenna panels is performed within a cyclic prefix,
the one or more SRS resources include a plurality of SRS resources, and
successive SRS resources of the plurality of SRS resources associated with different indicators of the plurality of indicators identifying different antenna panels of the plurality of antenna panels are located within consecutive symbols.
8. The base station of claim 1 , wherein:
panel switching associated with the plurality of antenna panels is performed within a time duration longer than a cyclic prefix,
the one or more SRS resources include a plurality of SRS resources, and
successive SRS resources of the plurality of SRS resources associated with different indicators of the plurality of indicators identifying different antenna panels of the plurality of antenna panels are spaced apart by at least one guard symbol.
9. The base station of claim 8 , wherein a time gap for the panel switching is determined by a number of the at least one guard symbol and is determined based on at least one of subcarrier spacing or a frequency range.
10. The base station of claim 1 , wherein the plurality of indicators include a downlink transmission configuration indication (TCI) state associated with a downlink channel reception from a first antenna panel of the plurality of antenna panels and at least one of an uplink TCI state or an uplink spatial filter associated with an uplink channel transmission to a second antenna panel of the plurality of antenna panels.
11. The base station of claim 10 , wherein the at least one processor configured to transmit the plurality of indicators is configured to:
transmit a single TCI codepoint indicating the downlink TCI state and at least one of the uplink TCI state or the uplink spatial filter, or
transmit a first TCI codepoint indicating the downlink TCI state and a second TCI codepoint indicating at least one of the uplink TCI state or the uplink spatial filter.
12. The base station of claim 1 , wherein the at least one processor is further configured to:
transmit a plurality of communication configurations respectively associated with the plurality of antenna panels, wherein each of the plurality of communication configurations indicates a transmission configuration or a reception configuration associated with a respective antenna panel of the plurality of antenna panels.
13. The base station of claim 12 , wherein the plurality of antenna panels includes one or more antenna panels for transmission or reception in a time division duplex (TDD) mode, and
wherein the plurality of communication configurations are determined based on the TDD mode.
14. The base station of claim 12 , wherein the plurality of antenna panels includes at least one antenna panel for transmission and at least one antenna panel for reception in a full duplex mode, and
wherein the plurality of communication configurations are determined based on the full duplex mode.
15. A method of wireless communication by a base station, comprising:
transmitting a plurality of indicators identifying a plurality of antenna panels on the base station to a user equipment (UE), wherein each indicator of the plurality of indicators identifies a respective panel of the plurality of antenna panels of the base station;
communicating with the UE based on the plurality of indicators of the plurality of antenna panels,
identifying one or more sounding reference signal (SRS) resources, wherein transmitting the plurality of indicators comprises transmitting resource information indicating the one or more SRS resources, each SRS resource of the one or more SRS resources being associated with at least one indicator of the plurality of indicators identifying at least one respective antenna panel of the plurality of antenna panels; and
receiving a plurality of sounding reference signals (SRSs) from the UE via the plurality of antenna panels on the one or more SRS resources.
16. A user equipment (UE) for wireless communication, comprising:
at least one processor;
a transceiver communicatively coupled to the at least one processor; and
a memory communicatively coupled to the at least one processor,
wherein the at least one processor is configured to:
receive, from a base station configured to communicate via a plurality of antenna panels, a plurality of indicators to respectively identify the plurality of antenna panels of the base station; and
transmit a plurality of sounding reference signals (SRSs) respectively to the plurality of antenna panels of the base station based on the plurality of indicators,
wherein the at least one processor configured to receive the plurality of indicators is configured to receive resource information indicating one or more sounding reference signal (SRS) resources from the base station, wherein each SRS resource of the one or more SRS resources is associated with at least one indicator of the plurality of indicators identifying at least one respective antenna panel of the plurality of antenna panels, and
wherein the at least one processor configured to transmit the plurality of SRSs is configured to transmit the plurality of SRSs to the base station on the one or more SRS resources.
17. The UE of claim 16 , wherein the at least one processor is further configured to:
receive a plurality of downlink reference signals respectively via a plurality of downlink reference signal beams respectively indicated by a plurality of uplink spatial filters respectively corresponding to the plurality of antenna panels or a plurality of transmission configuration indication (TCI) states respectively corresponding to the plurality of antenna panels, the plurality of indicators comprising the plurality of uplink spatial filters and/or the plurality of TCI states; and
select a plurality of UE beams, wherein each UE beam of the plurality of UE beams is selected based on a respective downlink reference signal of the plurality of downlink reference signals,
wherein the plurality of SRSs are transmitted respectively using the plurality of UE beams respectively to the plurality of antenna panels.
18. The UE of claim 16 , wherein the at least one processor configured to receive the resource information indicating the one or more SRS resources is configured to:
receive an SRS resource configuration of the one or more SRS resources.
19. The UE of claim 18 , wherein the SRS resource configuration is received in response to panel switching in one or more of the plurality of antenna panels.
20. The UE of claim 16 , wherein the one or more SRS resources include at least one SRS resource that is repeatedly used for a plurality of SRS transmissions, each of the plurality of SRS transmissions using the at least one SRS resource associated with a respective indicator of the at least one indicator identifying a respective antenna panel of the plurality of antenna panels.
21. The UE of claim 16 , wherein the one or more SRS resources include a plurality of SRS resources, each comprising a single respective indicator of the plurality of indicators identifying a single antenna panel of the plurality of antenna panels.
22. The UE of claim 16 , wherein:
panel switching associated with the plurality of antenna panels is performed within a cyclic prefix,
the one or more SRS resources include a plurality of SRS resources, and
successive SRS resources of the plurality of SRS resources associated with different indicators of the plurality of indicators identifying different antenna panels of the plurality of antenna panels are located within consecutive symbols.
23. The UE of claim 16 , wherein:
panel switching associated with the plurality of antenna panels is performed within a time duration longer than a cyclic prefix,
the one or more SRS resources include a plurality of SRS resources, and
successive SRS resources of the plurality of SRS resources associated with different indicators of the plurality of indicators identifying different antenna panels of the plurality of antenna panels are spaced apart by at least one guard symbol.
24. The UE of claim 23 , wherein a time gap for panel switching is determined by a number of the at least one guard symbol and is determined based on at least one of subcarrier spacing or a frequency range.
25. The UE of claim 16 , wherein the plurality of indicators include a downlink transmission configuration indication (TCI) state associated with a downlink channel reception from a first antenna panel of the plurality of antenna panels and at least one of an uplink TCI state or an uplink spatial filter associated with an uplink channel transmission to a second antenna panel of the plurality of antenna panels.
26. The UE of claim 25 , wherein the at least one processor configured to receive the plurality of indicators is configured to receive a single TCI codepoint indicating the downlink TCI state and the at least one of the uplink TCI state or the uplink spatial filter, or
wherein the at least one processor configured to receive the plurality of indicators is configured to receive a first TCI codepoint indicating the downlink TCI state and a second TCI codepoint indicating the at least one of the uplink TCI state or the uplink spatial filter.
27. The UE of claim 16 , wherein the at least one processor is further configured to:
receive a plurality of communication configurations respectively associated with the plurality of antenna panels, wherein each of the plurality of communication configurations indicates a transmission configuration or a reception configuration associated with a respective antenna panel of the plurality of antenna panels.
28. A method of wireless communication by a user equipment (UE), comprising:
receiving, from a base station configured to communicate via a plurality of antenna panels, a plurality of indicators to respectively identify the plurality of antenna panels of the base station;
transmitting a plurality of sounding reference signals (SRSs) respectively to the plurality of antenna panels of the base station based on the plurality of indicators,
wherein said receiving the plurality of indicators includes receiving resource information indicating one or more sounding reference signal (SRS) resources from the base station, wherein each SRS resource of the one or more SRS resources is associated with at least one indicator of the plurality of indicators identifying at least one respective antenna panel of the plurality of antenna panels, and
wherein said transmitting the plurality of SRSs includes transmitting the plurality of SRSs to the base station on the one or more SRS resources.