Beam failure recovery for user equipment communicating with multiple transmission and reception points
A user equipment (UE) may establish communication with a plurality of transmission reception points (TRPs) and determine one or more beam failures associated with a first or second TRP based on reference signals received from the first and second TRPs. The UE may then transmit a scheduling request requesting resources for indicating the beam failures associated with the first TRP or second TRPs. Upon receiving a response to the scheduling request allocating resources, the UE may then transmit, using allocated resources, a beam failure indication of the first one or more beam failures associated with the first TRP or second TRP. After receiving a beam failure response from the first or second TRP, the UE may then communicate with the first TRP and the second TRP using one or more new beams based on the beam failure indication and the beam failure response.
1. An apparatus, comprising:
a processor configured to, when executing instructions stored in a memory, perform operations comprising:
receiving a configuration including a first beam failure detection reference signal (BFD RS) set corresponding to a first transmission reception point (TRP) of a plurality of TRPs, a second BFD RS set corresponding to a second TRP of the plurality of TRPs, and at least one dedicated scheduling request associated with beam failure indication for one or more of the first and second BFD RS sets;
transmitting the at least one dedicated scheduling request requesting resources for indicating a first one or more beam failures associated with the first BFD RS set and a second one or more beam failures associated with the second BFD RS set;
receiving a response to the at least one dedicated scheduling request allocating resources; and
transmitting, using the allocated resources, a beam failure indication in a medium access control-control element (MAC-CE) indicating the first one or more beam failures associated with the first BFD RS set and the second one or more beam failures associated with the second BFD RS set, wherein the beam failure indication includes indications of:
one or more serving cells with detected beam failures,
whether a first new beam is identified from a first candidate beam detection reference signal (CBD RS) set corresponding to the first TRP,
the first new beam,
whether a second new beam is identified from a second CBD RS set corresponding to the second TRP, and
the second new beam.
2. The apparatus of claim 1 , wherein the configuration includes a single dedicated scheduling request associated with the beam failure indication for both the first and second BFD RS sets.
3. The apparatus of claim 1 , wherein the configuration includes respective dedicated scheduling requests associated with the beam failure indication for each of the first and second BFD RS sets.
4. The apparatus of claim 1 , wherein the instructions are further executable to cause the processor to perform additional operations comprising:
receiving a response to the beam failure indication; and
communicating with the first TRP and the second TRP using one or more new beams based on the beam failure indication and a beam failure response.
5. The apparatus of claim 1 , wherein the beam failure indication includes indexes of the first and second BFD-RS sets.
6. The apparatus of claim 1 , wherein the at least one dedicated scheduling request has a priority configured by radio resource control (RRC) signaling or is determined by an associated TRP index, schedulingRequestId, or PUCCH resource index.
7. The apparatus of claim 1 , further comprising:
a radio operably coupled to the processor.
8. A method, comprising:
receiving a configuration including a first beam failure detection reference signal (BFD RS) set corresponding to a first transmission reception point (TRP) of a plurality of TRPs, a second BFD RS set corresponding to a second TRP of the plurality of TRPs, and at least one dedicated scheduling request associated with beam failure indication for one or more of the first and second BFD RS sets;
transmitting the at least one dedicated scheduling request requesting resources for indicating a first one or more beam failures associated with the first BFD RS set and a second one or more beam failures associated with the second BFD RS set;
receiving a response to the at least one dedicated scheduling request allocating resources; and
transmitting, using the allocated resources, a beam failure indication in a medium access control-control element (MAC-CE) indicating the first one or more beam failures associated with the first BFD RS set and the second one or more beam failures associated with the second BFD RS set, wherein the beam failure indication includes indications of:
one or more serving cells with detected beam failures,
whether a first new beam is identified from a first candidate beam detection reference signal (CBD RS) set corresponding to the first TRP,
the first new beam,
whether a second new beam is identified from a second CBD RS set corresponding to the second TRP, and
the second new beam.
9. The method of claim 8 , wherein the configuration includes a single dedicated scheduling request associated with the beam failure indication both the first and second BFD RS sets.
10. The method of claim 8 , wherein the configuration includes respective dedicated scheduling requests associated with the beam failure indication for each of the first and second BFD RS sets.
11. The method of claim 8 , further comprising:
receiving a response to the beam failure indication; and
communicating with the first TRP and the second TRP using one or more new beams based on the beam failure indication and a beam failure response.
12. The method of claim 8 , wherein the beam failure indication includes indexes of the first and second BFD-RS sets.
13. The method of claim 8 , further comprising:
transmitting, at a first time, the at least one dedicated scheduling request to the first TRP; and
transmitting, at a second time, the at least one dedicated scheduling request to the second TRP, wherein the second time is later than the first time.
14. The method of claim 8 , wherein the at least one dedicated scheduling request has a priority configured by radio resource control (RRC) signaling or is determined by an associated TRP index, schedulingRequestId, or PUCCH resource index.
15. A non-transitory computer readable storage medium storing program instructions executable by one or more processors of a user equipment (UE) to cause the UE to:
receive a configuration including a first beam failure detection reference signal (BFD RS) set corresponding to a first transmission reception point (TRP) of a plurality of TRPs, a second BFD RS set corresponding to a second TRP of the plurality of TRPs, and at least one dedicated scheduling request associated with beam failure indication for one or more of the first and second BFD RS sets;
transmit the at least one dedicated scheduling request requesting resources for indicating a first one or more beam failures associated with the first BFD RS set and a second one or more beam failures associated with the second BFD RS set;
receive a response to the at least one dedicated scheduling request allocating resources; and
transmit, using the allocated resources, a beam failure indication in a medium access control-control element (MAC-CE) indicating the first one or more beam failures associated with the first BFD RS set and the second one or more beam failures associated with the second BFD RS set, wherein the beam failure indication includes indications of:
one or more serving cells with detected beam failures,
whether a first new beam is identified from a first candidate beam detection reference signal (CBD RS) set corresponding to the first TRP,
the first new beam,
whether a second new beam is identified from a second CBD RS set corresponding to the second TRP, and
the second new beam.
16. The non-transitory computer readable storage medium of claim 15 , wherein the configuration includes a single dedicated scheduling request associated with the beam failure indication both the first and second BFD RS sets.
17. The non-transitory computer readable storage medium of claim 15 , wherein the configuration includes a respective dedicated scheduling requests associated with the beam failure indication for each of the first and second BFD RS sets.
18. The non-transitory computer readable storage medium of claim 15 , wherein the program instructions are further executable to cause the UE to:
receive a response to the beam failure indication; and
communicate with the first TRP and the second TRP using one or more new beams based on the beam failure indication and a beam failure response.
19. The non-transitory computer readable storage medium of claim 15 , wherein the beam failure indication includes indexes of the first and second BFD-RS sets.
20. The non-transitory computer readable storage medium of claim 15 , wherein the at least one dedicated scheduling request has a priority configured by radio resource control (RRC) signaling or is determined by an associated TRP index, schedulingRequestId, or PUCCH resource index.