Methods and apparatus for beam determination for physical uplink control channel (PUCCH) transmission

A user equipment (UE), comprising a processor and a memory, wherein the processor is configured to cause the UE to:

• start a contention-based random-access channel (RACH) upon detecting beam failure of a serving cell;
• transmit a medium access control (MAC) control element (CE), wherein the MAC CE signals the beam failure of the serving cell in a message of the contention-based RACH;
• determine completion of the contention-based RACH based on receipt of a physical downlink control channel (PDCCH);
• determine whether each resource of a physical uplink control channel (PUCCH) is configured with a PUCCH spatial relation information parameter, and
• when determining that the resource of the PUCCH is configured with the PUCCH spatial relation information parameter, after receiving one or more of the last symbols of the PDCCH, determine a default Tx beam for the resource of the PUCCH that includes the PUCCH spatial relation information parameter.