Method and apparatus for transmitting beam failure recovery information by user equipment in wireless communication system
A method for transmitting a truncated beam failure recovery (BFR) medium access control (MAC) control element (CE) by a user equipment (UE) in a wireless communication system is disclosed. The method comprises steps of generating a truncated BFR MAC CE while not exceeding an available grant size upon detecting beam failures on a plurality of serving cells; and transmitting the truncated BFR MAC CE to the network, wherein generating the BFR MAC CE comprises: based on beam failure being detected on a special cell (SpCell) among the plurality of serving cells, including BFR information for SpCell among the plurality of serving cells into the truncated beam failure MAC CE firstly; and based on beam failure being detected on at least one SCell among the plurality of serving cells, including first BFR information for each of the at least one secondary cell (SCell) into the truncated beam failure MAC CE in ascending order of a serving cell index, and including second BFR information for each of the at least one SCell into the truncated beam failure MAC CE in ascending order of the serving cell index.
1 . A method for transmitting a truncated beam failure recovery (BFR) medium access control (MAC) control element (CE) by a user equipment (UE) in a wireless communication system, the method comprising:
generating a truncated BFR MAC CE while not exceeding an available grant size upon detecting beam failures on a plurality of serving cells; and
transmitting the truncated BFR MAC CE to the network,
wherein generating the BFR MAC CE comprises:
including BFR information for a special cell (SpCell) among the plurality of serving cells into the truncated BFR MAC CE firstly;
including first BFR information for each of a plurality of secondary cells (SCells) among the plurality of serving cells into the truncated BFR MAC CE in ascending order of a serving cell index; and
based on there being second BFR information for at least one SCell among the plurality of SCells, including the second BFR information for each of the at least one SCell into the truncated BFR MAC CE in ascending order of the serving cell index.
2 . The method of claim 1 , wherein the plurality of serving cells is configured with multiple transmission and reception points (TRPs), and
wherein the first BFR information is related to one TRP of the multiple TRPs, and the second BFR information is related to another TRP of the multiple TRPs.
3 . The method of claim 2 , wherein based on the beam failure being detected on at least two TRPs of the SpCell, the first BFR information for the SpCell and the second BFR information for the SpCell is included into the truncated BFR MAC CE firstly before including the first and second BFR information for the at least one SCell.
4 . The method of claim 2 , wherein the first and second BFR information includes fields indicating corresponding TRPs.
5 . The method of claim 1 , wherein the truncated BFR MAC CE includes bitmap information indicating whether the beam failure is detected or not on each of the plurality of serving cells.
6 . A user equipment (UE) in a wireless communication system, the UE comprising:
at least one processor; and
at least one computer memory storing instructions that, when executed by the at least one processor, cause the UE to perform operations comprising:
generating a truncated beam failure recovery (BFR) medium access control (MAC) control element (CE) while not exceeding an available grant size upon detecting beam failures on a plurality of serving cells; and
transmitting the truncated BFR MAC CE to the network,
wherein generating the BFR MAC CE comprises:
including BFR information for a special cell (SpCell) among the plurality of serving cells into the truncated BFR MAC CE firstly;
including first BFR information for each of a plurality of secondary cells (SCells) among the plurality of serving cells into the truncated BFR MAC CE in ascending order of a serving cell index; and
based on there being second BFR information for at least one SCell among the plurality of SCells, including the second BFR information for each of the at least one SCell into the truncated BFR MAC CE in ascending order of the serving cell index.
7 . The UE of claim 6 , wherein the plurality of serving cells is configured with multiple transmission and reception points (TRPs), and
wherein the first BFR information is related to one TRP of the multiple TRPs, and the second BFR information is related to another TRP of the multiple TRPs.
8 . The UE of claim 7 , wherein based on the beam failure being detected on at least two TRPs of the SpCell, the first BFR information for the SpCell and the second BFR information for the SpCell is included into the truncated BFR MAC CE firstly before including the first and second BFR information for the at least one SCell.
9 . The UE of claim 7 , wherein the first and second BFR information includes fields indicating corresponding TRPs.
10 . The UE of claim 6 , wherein the truncated BFR MAC CE includes bitmap information indicating whether the beam failure is detected or not on each of the plurality of serving cells.