Patent ID: 11917463
Assignee: TOGAIL TECHNOLOGIES, LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for a user equipment (UE) for performing a handover procedure with minimum mobility interruption, the method comprising:
receiving, at the UE, a reconfiguration message having an indicator for performing a dual-connectivity based (DC-based) handover procedure;
performing the DC-based handover procedure without reestablishing a packet data convergence protocol (PDCP) entity of the UE during the DC-based handover procedure, wherein the PDCP entity maintains a plurality of security keys to decipher PDCP packets received from at least one of a source base station and a target base station while the UE is transitioning from the source base station to the target base station, wherein performing the DC-based handover procedure comprises:
applying first and second security keys to the PDCP packets received, respectively, from the source and target base stations using additional network (NW) assistance information, and
wherein the additional NW assistance information comprises an end-marker PDCP control packet data unit (PDU), the end-marker indicating that the last PDCP packet that uses the first security key to be deciphered has been delivered.