Relations between beam group beam failure recovery and cell level beam failure recovery
In operation, the UE in the cell (SpCell/SCell) may be configured to operate with beam group specific BFRs, cell-level BFRs, or combinations of them under a beam failure configuration that is determined according to various rules. A method of wireless communication performed by a user equipment (UE) and a UE is disclosed. The method includes determining a beam failure configuration for a serving cell, the beam failure configuration including at least one of a beam failure parameter of a beam group or a beam failure parameter of a cell; and detecting, in the serving cell based at least in part on the beam failure configuration, a beam failure recovery (BFR) based at least in part on the beam failure configuration. The beam failure configuration is determined based on various rules that control the operation of the BFR.
1. A method of wireless communication performed by a user equipment (UE), the method comprising:
receiving, from a base station (BS), configuration information including a beam failure parameter of a beam group, wherein the beam failure parameter of the beam group is associated with a beam group-specific triggering condition for initiating a beam failure recovery (BFR) procedure; and
detecting, in a serving cell based at least in part on the configuration information, a beam failure.
2. The method of claim 1 , wherein the beam failure parameter of the beam group comprises at least one of a transmission-reception point (TRP)-specific beam failure detection (BFD) parameter or a TRP-specific beam failure recovery (BFR) parameter.
3. The method of claim 1 , wherein:
the configuration information includes a plurality of TRP-specific beam failure parameters associated with a plurality of TRPs; and
the detecting the beam failure comprises independently monitoring for beam for each of the plurality of TRPs.
4. The method of claim 1 , wherein:
the configuration information further includes a beam failure parameter of the serving cell; and
the beam failure parameter of the beam group includes a beam group-specific BFD parameter and the beam failure parameter of the serving cell includes a cell-level BFD parameter.
5. The method of claim 4 , wherein the detecting the beam failure comprises:
performing a first BFD based on the beam group-specific BFD parameter; and
performing a second BFD based on the cell-level BFD parameter.
6. The method of claim 5 , wherein the configuration information includes a beam group-specific BFR parameter and does not include a cell-level BFR parameter, the method further comprising:
performing a BFR, in response to the detecting the beam failure in the first BFD, based on the beam group-specific BFR parameter.
7. The method of claim 5 , wherein the configuration information includes a cell-level BFR parameter and does not include a beam group-specific BFR parameter, the method further comprising:
performing, in response to the detecting the beam failure in the second BFD, a BFR based on the cell-level BFR parameter.
8. The method of claim 5 , wherein:
the performing the first BFD based on the beam group-specific BFD parameter comprises monitoring for at least one TRP-specific BFD reference signal (RS); and
the performing the second BFD based on the cell-level BFD parameter comprises monitoring for at least one cell-level BFD RS.
9. The method of claim 4 , wherein:
the beam failure parameter of the beam group includes a TRP-specific BFD parameter and wherein the configuration information further includes a TRP-specific BFR parameter; and
the detecting the beam failure comprises performing a BFD based on the TRP-specific BFD parameter, the method further comprising:
performing, in response to the BFD indicating the beam failure, a BFR based on the TRP-specific BFR parameter.
10. The method of claim 4 , wherein:
the beam group-specific BFD parameter includes a TRP-specific BFD parameter;
the cell-level BFD parameter includes a cell-level BFR parameter; and
the detecting the beam failure comprises performing a BFD based on the TRP-specific BFD parameter, the method further comprising:
performing, in response to the BFD indicating a beam failure, a BFR based on the cell-level BFR parameter.
11. The method of claim 4 , wherein:
the beam group-specific BFD parameter includes a TRP-specific BFD parameter and wherein the configuration information further comprises a TRP-specific BFR parameter;
the cell-level BFD parameter includes a cell-level BFD parameter and a cell-level BFR parameter; and
the detecting the beam failure comprises:
performing a first BFD based on the TRP-specific BFD parameter; and
performing a second BFD based on the cell-level BFD parameter.
12. The method of claim 11 , further comprising at least one of:
performing, in response to the first BFD indicating the beam failure, a first BFR based on the TRP-specific BFR parameter; or
performing, in response to the second BFD indicating the beam failure, a second BFR based on the cell-level BFR parameter.
13. The method of claim 1 , wherein:
the configuration information includes a plurality of TRP-specific beam failure parameters associated with a plurality of TRPs; and
the detecting the beam failure comprises:
performing a BFD for each of the plurality of TRPs; and
performing, based on a number of BFDs indicating the beam failure, a BFR.
14. The method of claim 13 , wherein the performing the BFR comprises:
performing, in response to the number being less than a first threshold, a TRP-specific BFR;
performing, in response to the number being greater than a second threshold, a cell-level BFR; or
disallowing the cell-level BFR when a threshold number of working TRPs is exceeded.
15. The method of claim 13 , further comprising:
receiving, from the base station, an indication of at least one threshold value for determining whether to perform a TRP-specific BFR or a cell-level BFR.
16. The method of claim 13 , wherein further comprises:
performing, in response to detection of the beam failure, a cell-level BFR; and
terminating any active TRP-specific BFRs.
17. The method of claim 4 , wherein:
the beam group-specific BFD parameter includes a plurality of TRP-specific beam failure parameters associated with a plurality of TRPs; and
the cell-level BFD parameter includes a radio-link failure (RLF) parameter;
the detecting the beam failure comprises performing a BFD for each of the plurality of TRPs, the method further comprising:
performing, based on a number of BFDs indicating the beam failure, a recovery.
18. A user equipment (UE), comprising:
one or more memory devices; and
one or more processors in communication with the one or more memory devices, wherein the UE is configured to:
receive, from a base station (BS), configuration information including a beam failure parameter of a beam group, wherein the beam failure parameter of the beam group is associated with a beam group-specific triggering condition for initiating a beam failure recovery (BFR) procedure; and
detect, in a serving cell based at least in part on the configuration information, a beam failure.
19. The UE of claim 18 , wherein the beam failure parameter of the beam group comprises at least one of a transmission-reception point (TRP)-specific beam failure detection (BFD) parameter or a TRP-specific beam failure recovery (BFR) parameter.
20. The UE of claim 18 , wherein:
the configuration information includes a plurality of TRP-specific beam failure parameters associated with a plurality of TRPs; and
the UE configured to detect the beam failure comprises the UE configured to independently monitor for beam for each of the plurality of TRPs.