US 11,871,287 B2
Method and apparatus for handover in wireless communication system
Hyun Seo Park, Daejeon (KR); Yun Joo Kim, Daejeon (KR); Eunkyung Kim, Daejeon (KR); Tae Joong Kim, Daejeon (KR); An Seok Lee, Daejeon (KR); Yu Ro Lee, Daejeon (KR); and Heesoo Lee, Daejeon (KR)
Assigned to Electronics and Telecommunications Research Institute, Daejeon (KR)
Filed by ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, Daejeon (KR)
Filed on Jul. 23, 2021, as Appl. No. 17/384,703.
Claims priority of application No. 10-2020-0092137 (KR), filed on Jul. 24, 2020; and application No. 10-2021-0096512 (KR), filed on Jul. 22, 2021.
Prior Publication US 2022/0030476 A1, Jan. 27, 2022
Int. Cl. H04W 36/00 (2009.01); H04W 36/08 (2009.01)
CPC H04W 36/0058 (2018.08) [H04W 36/08 (2013.01)] 17 Claims
OG exemplary drawing
 
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.