Beam failure detection and recovery
A user equipment (UE) is configured with at least one bandwidth part (BWP) specific configuration information. The UE receives a configuration information specific to the bandwidth part (BWP). The configuration information configures an initial value of a beam failure detection (BFD) timer and a beam failure indication (BFI) count threshold. The UE starts or re-starts the BFD timer from the initial value when receiving a beam failure indication (BFI) from a lower sublayer, and counts a number of the received BFIs using a BFI counter. The UE resets the BFI counter to zero when receiving a reconfiguration information. The reconfiguration information, that is specific to the BWP, re-configures at least one of the initial value of the BFD timer and the BFI count threshold.
1. A user equipment (UE) for wireless communication, the UE comprising:
one or more non-transitory computer-readable media having executable instructions embodied thereon; and
at least one processor coupled to the one or more non-transitory computer-readable media and configured to execute the executable instructions to:
receive a first radio resource control (RRC) configuration, the first RRC configuration configuring 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 when receiving a BFI 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 a count of the BFI counter is greater than or equal to a BFI count threshold; and
set the BFI counter to zero when receiving a second RRC configuration, the second RRC configuration reconfiguring the BFD timer,
wherein both the first RRC configuration and the second RRC configuration are associated with a specific downlink bandwidth part (BWP).
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 is a radio link monitoring configuration information element.
4. A method for wireless communication, the method comprising:
receiving a first radio resource control (RRC) configuration, the first RRC configuration configuring 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 when receiving a BFI 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 a count of the BFI counter is greater than or equal to a BFI count threshold; and
setting the BFI counter to zero when receiving a second RRC configuration, the second RRC configuration reconfiguring the BFD timer,
wherein both the first RRC configuration and the second RRC configuration are associated with a specific downlink bandwidth part (BWP).
5. The method of claim 4 , wherein the second RRC configuration is received via a downlink RRC message.
6. The method of claim 4 , wherein the second RRC configuration is a radio link monitoring configuration information element.
7. The UE of claim 1 , wherein the first RRC configuration is one of a beam failure recovery configuration information element and a radio link monitoring configuration information element.
8. The method of claim 4 , wherein the first RRC configuration is one of a beam failure recovery configuration information element and a radio link monitoring configuration information element.