APPARATUS AND METHOD FOR ENHANCED BEAM RECOVERY
Some embodiments of this disclosure include systems, apparatuses, methods, and computer-readable media for use in a wireless network for facilitating beam failure recovery procedure. Some embodiments are directed to a method, the method including detecting a beam failure instance. The method further including initiating a beam failure recovery procedure by dynamically activating or deactivating candidate beams per uplink bandwidth part (BWP) associated with a user equipment (UE). Moreover, the method further includes generating a control signal to identify the one or more activated or deactivated candidate beams for at least one BWP associated with the UE. The method also includes transmitting the control signal to the UE.
1 . A method for beam failure recovery (BFR), the method comprising:
detecting a beam failure instance;
initiating a beam failure recovery procedure by activating or deactivating candidate beams for at least one uplink bandwidth part (BWP) associated with a user equipment (UE);
generating a control signal to identify the one or more activated or deactivated candidate beams for the at least one BWP associated with the UE; and
transmitting the control signal to the UE.
2 . The method of claim 1 , wherein the control signal is a media access (MAC) control element (CE).
3 . The method of claim 2 , wherein the one or more activated or deactivated candidate beams are identified in a media access control (MAC) protocol data unit (PDU) subheader with a new logical channel ID (LCID) in the MAC CE.
4 . The method of claim 2 , further comprising:
identifying, to the UE, a serving cell identification within the MAC CE for which the MAC CE applies.
5 . The method of claim 2 , further comprising:
identifying, to the UE, a BWP ID indicating the at least one uplink BWP for which the MAC CE applies.
6 . The method of claim 2 , further comprising:
validating the set of activated candidate beams at predetermined slots in response to receiving a hybrid automatic repeat request acknowledgement (HARQ-ACK) from the UE acknowledging a physical downlink shared channel (PDSCH) signal carrying the MAC CE.
7 . The method of claim 1 , wherein the control signal is a physical random access channel (PRACH) information element (IE).
8 . The method of claim 7 , further comprising:
configuring, for at least one uplink BWP, a subset of cell-specific candidate beams by including indices associated with the subset of candidate beams in a cell-specific uplink configuration message.
9 . An apparatus for beam failure recovery (BFR), the apparatus comprising:
radio front end circuitry; and
processor circuitry coupled to the radio front end circuitry and configured to:
detect a beam failure instance,
initiate a beam failure recovery procedure by activating or deactivating candidate beams for at least one uplink bandwidth part (BWP) associated with a user equipment (UE),
generate a control signal to identify the one or more activated or deactivated candidate beams for the at least one BWP associated with the UE, and
transmit, using the radio front end circuitry, the control signal to the UE.
10 . The apparatus of claim 9 , wherein the control signal is a media access (MAC) control element (CE).
11 . The apparatus of claim 10 , wherein the processor circuitry is further configured to:
identify the one or more activated or deactivated candidate beams in a media access control (MAC) protocol data unit (PDU) subheader with a new logical channel ID (LCID) in the MAC CE.
12 . The apparatus of claim 10 , wherein the processor circuitry is further configured to:
identify, to the UE, a serving cell identification within the MAC CE for which the MAC CE applies.
13 . The apparatus of claim 10 , wherein the processor circuitry is further configured to:
identify, to the UE, a BWP ID indicating the at least one uplink BWP for which the MAC CE applies.
14 . The apparatus of claim 10 , wherein the processor circuitry is further configured to:
validate the set of activated candidate beams at predetermined slots in response to receiving a hybrid automatic repeat request acknowledgement (HARQ-ACK) from the UE acknowledging a physical downlink shared channel PDSCH signal carrying the MAC CE.
15 . The apparatus of claim 9 , wherein the control signal is a physical random access channel (PRACH) information element (IE).
16 . The apparatus of claim 15 , wherein the processor circuitry is further configured to:
configure, for the at least one uplink BWP, a subset of cell-specific candidate beams by including indices of the candidate beams in a cell-specific uplink configuration message.
17 . A non-transitory computer-readable medium comprising instructions to cause an apparatus, upon execution of the instructions by one or more processors of the apparatus, to perform one or more operations, the operations comprising:
detecting a beam failure instance;
initiating a beam failure recovery procedure by activating or deactivating candidate beams for at least one uplink bandwidth part (BWP) associated with a user equipment (UE);
generating a control signal to identify the one or more activated or deactivated candidate beams for the at least one BWP associated with the UE; and
transmitting the control signal to the UE.
18 . The non-transitory computer-readable medium of claim 17 , wherein the control signal is a media access (MAC) control element (CE).
19 . The non-transitory computer-readable medium of claim 18 , the operations further comprising:
identifying the one or more candidate beams in a media access control (MAC) protocol data unit (PDU) subheader with a new logical channel ID (LCID) in the MAC CE.
20 . The non-transitory computer-readable medium of claim 18 , the operations further comprising:
identifying, to the UE, a serving cell identification within the MAC CE for which the MAC CE applies.