| CPC H04W 80/02 (2013.01) [H04L 1/1874 (2013.01); H04W 72/23 (2023.01); H04W 74/02 (2013.01); H04W 74/0833 (2013.01)] | 20 Claims |

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1. A user equipment (UE), comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
receive a random access response message including an uplink grant;
obtain a medium access control (MAC) protocol data unit (PDU) from a message 3 (Msg3) buffer based at least in part on that the uplink grant is received in the random access response message;
determine that an uplink grant size is different than a size of the obtained MAC PDU; and
output an indication to include only one or more MAC sub-protocol data units (subPDUs) carrying only one or more MAC service data units (MAC SDUs) from the obtained MAC PDU in a subsequent uplink transmission based at least in part on the determination that the uplink grant size is different than the size of the obtained MAC PDU.
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