Patent ID: 11871287
Assignee: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A handover method of a first terminal in a wireless communication system, the handover method comprising:
transmitting a first measurement report message to a first cell that is a primary cell (PCell);
receiving, from the first cell, one or more first configuration messages for one or more target cells determined according to the first measurement report message;
adding each of the one or more target cells as a candidate PCell based on the one or more first configuration messages;
performing data transmission and reception with at least one cell among the first cell and the one or more candidate PCells;
changing a PCell of the first terminal from the first cell to a second cell determined as a handover target among the one or more candidate PCells;
performing a first process for signaling of reception status information for data transmission between the first terminal and the first cell before the changing of the PCell of the first terminal; and
when it is identified that there is lost data based on the reception status information, performing a second process for transmission and reception of recovered data corresponding to the lost data.