US 12,414,199 B2
Method and apparatus for mobility management in wireless communication system
Jian Xu, Seoul (KR); Daewook Byun, Seoul (KR); and Seokjung Kim, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Appl. No. 17/608,638
Filed by LG Electronics Inc., Seoul (KR)
PCT Filed May 4, 2020, PCT No. PCT/KR2020/005897
§ 371(c)(1), (2) Date Nov. 3, 2021,
PCT Pub. No. WO2020/226398, PCT Pub. Date Nov. 12, 2020.
Claims priority of application No. 10-2019-0052191 (KR), filed on May 3, 2019.
Prior Publication US 2022/0232433 A1, Jul. 21, 2022
Int. Cl. H04W 76/36 (2018.01); H04W 36/00 (2009.01); H04W 76/27 (2018.01); H04W 92/20 (2009.01)
CPC H04W 76/36 (2018.02) [H04W 36/0061 (2013.01); H04W 76/27 (2018.02); H04W 92/20 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method performed by a target base station for a mobility of a user equipment (UE) from a source base station, the method comprising:
receiving, by a central unit (CU)-control plane (CP) of the target base station from the source base station, a request message comprising a notification that a dual connection-based mobility is requested,
wherein the dual connection-based mobility is a mobility that maintains a connection with the source base station until releasing the connection with the source base station after a random access to the target base station;
transmitting, by the CU-CP of the target base station to a CU-user plane (UP) of the target base station, a bearer context setup request message comprising a notification that the dual connection-based mobility is requested;
receiving, by the CU-CP of the target base station from the CU-UP of the target base station, a bearer context setup response message;
transmitting, by the CU-CP of the target base station to the source base station, a response message for the request message, the response message comprising a notification that the dual connection-based mobility is accepted;
performing the random access with the UE; and
transmitting, by the CU-CP of the target base station to the source base station, a UE context release message related to releasing a UE context in the source base station, after performing the random access with the UE.