RACH procedure with timing alignment

A user equipment (UE) for wireless communication, comprising:

• a memory;
• and
• one or more processors coupled to the memory, the one or more processors configured to:
• determine, based at least in part on a beam failure associated with a serving beam associated with the UE, to initiate a random access channel (RACH) procedure with a base station (BS);
• initiate, based at least in part on receiving an indication of a timing alignment from the BS, a timing alignment timer associated with the timing alignment, wherein the timing alignment identifies a timing offset or a gap between a downlink and uplink of a wireless communication link between the UE and the BS;
• determine, based at least in part on determining to initiate the RACH procedure, whether the timing alignment timer is expired;
• and
• initiate the RACH procedure on a target beam, associated with the UE and different from the serving beam, using the timing alignment based at least in part on determining that the timing alignment timer is not expired.

A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising:

• one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the one or more processors to:
• determine, based at least in part on a beam failure associated with a serving beam associated with the UE, to initiate a random access channel (RACH) procedure with a base station (BS);
• initiate, based at least in part on receiving an indication of a timing alignment from the BS, a timing alignment timer associated with the timing alignment, wherein the timing alignment identifies a timing offset or a gap between a downlink and uplink of a wireless communication link between the UE and the BS;
• determine, based at least in part on determining to initiate the RACH procedure, whether the timing alignment timer is expired;
• and
• initiate on a target beam, associated with the UE and different from the serving beam, the RACH procedure using the timing alignment based at least in part on determining that the timing alignment timer is not expired.

An apparatus for wireless communication, comprising:

• means for determining to initiate a random access channel (RACH) procedure with a base station (BS);
• means for initiating, based at least in part on receiving an indication of a timing alignment from the BS, a timing alignment timer associated with the timing alignment, wherein the timing alignment identifies a timing offset or a gap between a downlink and uplink of a wireless communication link between the apparatus and the BS;
• means for determining, based at least in part on determining to initiate the RACH procedure based at least in part on a beam failure associated with a serving beam associated with the apparatus, whether the timing alignment timer is expired;
• and
• means for initiating the RACH procedure on a target beam, associated with the apparatus and different from the serving beam, using the timing alignment based at least in part on determining that the timing alignment timer is not expired.