Patent ID: 11968573
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A source base station performing a handover in a wireless communication system, the source base station comprising:
a transceiver;
at least one memory storing programs and data for executing the handover; and
at least one processor configured to, by executing the programs stored in the memory,
receive, from an access and mobility management function (AMF), a general packet radio service (GPRS) tunneling protocol user plane (GTP-U) sequence number indicating a start of packet duplication transmission of a user plane function (UPF),
receive, from the UPF, at least one packet being transmitted duplicately and assigned the GTP-U sequence number,
distinguish the received at least one packet and at least one redundant packet based on the GTP-U sequence number,
transmit, to a target base station, the at least one redundant packet, and
transmit, to the target base station, an end-mark indicating that transmission of the redundant packet is completed after transmitting all of the at least one redundant packet to the target base station, or along with a last redundant packet,
wherein the packet duplication transmission includes transmitting, to the target base station, a packet that is identical to a packet transmitted by the UPF,
wherein the at least one redundant packet is received from the UPF before the start of the packet duplication transmission but is not transmitted to a User Equipment (UE) and stored.