Patent ID: 11950146
Assignee: APPLE INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An apparatus, comprising:
a processor configured to cause a user equipment device (UE) to, in association with a multi-connectivity handover with a source base station (SBS) and a target base station (TBS):
transmit a measurement report to the SBS, the measurement report triggered based on a measurement event configured by the SBS;
receive radio resource control (RRC) signaling from the SBS, the RRC signaling including a handover command, the handover command including an indication for multi-connectivity support during handover by the SBS and the TBS;
configure a first protocol stack associated with the SBS and a second protocol stack associated with the TBS;
process a packet data convergence protocol (PDCP) protocol data unit (PDU) received at the UE during the handover, using the first protocol stack or the second protocol stack;
determine a sequence number (SN) of the PDCP PDU received at the UE during the handover;
perform integrity and deciphering operations of the PDCP PDU to generate a deciphered PDCP PDU using a first set of security keys associated with the SBS or a second set of security keys associated with the TBS based on whether the PDCP PDU is received from the SBS or the TBS;
store the deciphered PDCP PDU in a common buffer shared between the first protocol stack and the second protocol stack;
perform reordering to associate the deciphered PDCP PDU with the first protocol stack or the second protocol stack, based on the determined SN; and
perform robust header compression (ROHC) decompression of the deciphered PDCP PDU, subsequent to the reordering.