US 11,722,933 B2
Apparatus and method for supporting handover in a wireless communication system
Lixiang Xu, Beijing (CN); Hong Wang, Beijing (CN); and Xiaowan Ke, Beijing (CN)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Oct. 18, 2021, as Appl. No. 17/503,863.
Application 17/503,863 is a continuation of application No. 16/611,075, granted, now 11,153,787, previously published as PCT/KR2018/005233, filed on May 4, 2018.
Claims priority of application No. 201710313665.1 (CN), filed on May 5, 2017; application No. 201710327037.9 (CN), filed on May 10, 2017; application No. 201710400195.2 (CN), filed on May 31, 2017; application No. 201710552782.3 (CN), filed on Jul. 7, 2017; and application No. 201710687667.7 (CN), filed on Aug. 11, 2017.
Prior Publication US 2022/0038960 A1, Feb. 3, 2022
Int. Cl. H04W 4/00 (2018.01); H04W 36/00 (2009.01); H04W 36/08 (2009.01)
CPC H04W 36/0016 (2013.01) [H04W 36/0033 (2013.01); H04W 36/08 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method performed by a session management function (SMF) for a handover from a source radio access network (RAN) node to a target RAN node, the method comprising:
receiving, from an access and mobility function (AMF), a first request message including an identifier of a protocol data unit (PDU) session and a target identifier;
transmitting, to the AMF, a first response message including the identifier of the PDU session and session management (SM) information;
receiving, from the AMF, a second request message including tunnel information associated with the target RAN node for the PDU session;
in case of a direct forwarding, transmitting, to the AMF, a second response message including the tunnel information associated with the target RAN node;
in case of an indirect forwarding, transmitting, to a user plane function (UPF), a session modification request message for the indirect forwarding;
receiving, from the UPF, a session modification response message including tunnel information associated with the UPF; and
transmitting, to the AMF, a response message including the tunnel information allocated by the UPF.