US Patent No. 10,798,770

METHOD, APPARATUS, AND SYSTEM FOR ESTABLISHING SESSION


Patent No. 10,798,770
Issue Date October 06, 2020
Title Method, Apparatus, And System For Establishing Session
Inventorship Fenghui Dou, Beijing (CN)
Hui Jin, Beijing (CN)
Guowei Ouyang, Beijing (CN)
Yue He, Beijing (CN)
Haorui Yang, Shenzhen (CN)
Assignee HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)

Claim of US Patent No. 10,798,770

1. A system, comprising:a session management function (SMF) entity configured to:
establish a first Protocol Data Unit (PDU) session, wherein the first PDU session is served by a second user plane function (UPF) entity;
determine that the second UPF entity needs to be changed; and
send a first request message indicating a PDU session re-establishment; and
an access and mobility management function (AMF) entity configured to:
receive the first request message from the SMF entity;
send a first message to a terminal in response to the first request message, wherein the first message comprises PDU session release time information associated with the first PDU session;
receive a second message comprising a PDU session establishment request and a first PDU session identifier (ID) from the terminal after the terminal determines that a session and service continuity (SSC) mode for the first PDU session is a mode comprising releasing the first PDU session after establishing a new PDU session, wherein the first PDU session ID is associated with the first PDU session; and
send the second message to the SMF entity based on an association between the first PDU session ID and an SMF ID associated with the SMF entity stored in the AMF entity, and
wherein the SMF entity is further configured to:
establish the new PDU session, wherein the new PDU session is served by a first UPF; and
release the first PDU session according to the PDU session release time information.