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

Claim 4:
5. A handover method performed by a target base station in a wireless communication system, the handover method comprising:
receiving, from a user plane function (UPF), at least one packet being transmitted duplicately and assigned a general packet radio service (GPRS) tunneling protocol user plane (GTP-U) sequence number indicating a start of packet duplication transmission of the UPF;
receiving, from a source base station, at least one redundant packet based on the GTP-U sequence number; and
receiving, from the source 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 to the source base station;
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;
wherein the at least one packet and the at least one redundant packet are distinguished based on the GTP-U sequence number.