Beam failure detection and recovery
A user equipment (UE) and a method for wireless communication are provided. The method includes receiving a first radio resource control (RRC) configuration, the first RRC configuration configuring a radio link monitoring configuration that includes a beam failure detection (BFD) timer and a beam failure indication (BFI) count threshold; starting or restarting the BFD timer by a medium access control (MAC) entity of the UE each time a BFI is received from a lower layer; counting a number of the received BFIs using a BFI counter; initiating a beam failure recovery (BFR) procedure upon determining that the BFI counter indicates a value greater than or equal to the BFI count threshold; and setting the BFI counter to zero when receiving a second RRC configuration that reconfigures the radio link monitoring configuration.
1. A user equipment (UE) for wireless communication, the UE comprising:
one or more non-transitory computer-readable media storing executable instructions; and
at least one processor coupled to the one or more non-transitory computer-readable media and configured to execute the executable instructions to cause the UE to:
receive a first radio resource control (RRC) configuration, the first RRC configuration configuring a radio link monitoring configuration that includes a beam failure detection (BFD) timer and a beam failure indication (BFI) count threshold;
start or restart the BFD timer by a medium access control (MAC) entity of the UE each time a BFI is received from a lower layer;
count a number of the received BFIs using a BFI counter;
initiate a beam failure recovery (BFR) procedure upon determining that the BFI counter indicates a value greater than or equal to the BFI count threshold; and
set the BFI counter to zero when receiving a second RRC configuration that reconfigures the radio link monitoring configuration.
2. The UE of claim 1 , wherein the second RRC configuration is received via a downlink RRC message.
3. The UE of claim 1 , wherein the second RRC configuration reconfigures the BFI count threshold.
4. The UE of claim 1 , wherein the second RRC configuration reconfigures the BFD timer.
5. The UE of claim 1 , wherein both the first RRC configuration and the second RRC configuration are associated with a specific downlink bandwidth part (BWP).
6. A method performed by a User Equipment (UE) for wireless communication, the method comprising:
receiving a first radio resource control (RRC) configuration, the first RRC configuration configuring a radio link monitoring configuration that includes a beam failure detection (BFD) timer and a beam failure indication (BFI) count threshold;
starting or restarting the BFD timer by a medium access control (MAC) entity of the UE each time a BFI is received from a lower layer;
counting a number of the received BFIs using a BFI counter;
initiating a beam failure recovery (BFR) procedure upon determining that the BFI counter indicates a value greater than or equal to the BFI count threshold; and
setting the BFI counter to zero when receiving a second RRC configuration that reconfigures the radio link monitoring configuration.
7. The method of claim 6 , wherein the second RRC configuration is received via a downlink RRC message.
8. The method of claim 6 , wherein the second RRC configuration reconfigures the BFI count threshold.
9. The method of claim 6 , wherein the second RRC configuration reconfigures the BFD timer.
10. The method of claim 6 , wherein both the first RRC configuration and the second RRC configuration are associated with a specific downlink bandwidth part (BWP).