| CPC H04W 36/0069 (2018.08) [H04W 12/03 (2021.01); H04W 12/10 (2013.01); H04W 28/06 (2013.01); H04W 76/27 (2018.02); H04W 76/30 (2018.02); H04W 80/02 (2013.01); H04W 80/08 (2013.01)] | 8 Claims |
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1. A method of a source base station for performing a dual active protocol stack (DAPS) handover in a wireless communication system, the method comprising:
transmitting, to a target base station, a handover request including a first indicator indicating the DAPS handover is requested for a bearer;
receiving, from the target base station, a handover request acknowledgment message, the handover request acknowledgment message including a radio resource control (RRC) reconfiguration message for a user equipment (UE) and a second indicator indicating the DAPS handover is accepted or not for the bearer; and
transmitting, to the UE, the RRC reconfiguration message received in the handover request acknowledgment message,
wherein the RRC reconfiguration message includes DAPS configuration information for the bearer in case that the second indicator indicates that the DAPS handover is accepted by the target base station,
wherein the first indicator and the second indicator are identified per data radio bearer (DRB), and
wherein the DAPS handover indicates a handover procedure that maintains connection between the source base station and the UE after the UE receives the RRC reconfiguration message and until the UE releases the source base station after successful random access of the UE to the target base station.
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