QUALCOMM Incorporated
MESSAGE 3 REPETITION WITH RECEIVE BEAM SWEEP AND ASSOCIATED BEAM REFINEMENT FOR MESSAGE 4

Abstract:

A random access procedure between a user equipment (UE) and a base station may include repetition of a random access message 3 to improve reception and provide for selection of a refined beam. The UE may receive, using a first receive beam, a random access message 2 transmitted by a base station using a first transmit beam. The random access message 2 indicates to the UE to transmit a plurality of repetitions of a random access message 3. The UE may transmit the plurality of repetitions based on the random access message 2. The UE may receive a random access message 4 transmitted by the base station using a second transmit beam that is a sub-beam of the first transmit beam based on transmitting the plurality of repetitions. The base station may select the second transmit beam based on at least one of the plurality of repetitions.