Session management function entity selection method, apparatus, and system

A method implemented by a user equipment (UE) and comprising:

• sending, to a mobility management function entity, a first session establishment request for establishing a first session served by a first session management function entity;
• receiving, from the first session management function entity, a session re-establishment indication;
• and
• sending, to the mobility management function entity and in response to the session re-establishment indication, a second session establishment request for establishing a second session,
• wherein the second session establishment request comprises a first identifier of the first session, and
• wherein the second session establishment request is for selecting a second session management function entity that is different from the first session management function entity and that is for the second session.

A non-transitory computer-readable medium storing instructions that, when executed by one or more processors, cause a user equipment (UE) to:

• send, to a mobility management function entity, a first session establishment request for establishing a first session served by a first session management function entity;
• receive, from the first session management function entity, a session re-establishment indication from the first session management function entity;
• and
• send, to the mobility management function entity and in response to the session re-establishment indication, a second session establishment request for establishing a second session,
• wherein the second session establishment request comprises a first identifier of the first session, and
• wherein the second session establishment request is for selecting a second session management function entity that is different from the first session management function entity and that is for the second session.

An apparatus for session management function entity selection, the apparatus comprising:

• a memory configured to store instructions;
• and
• one or more processors coupled to the memory and configured to execute the instructions to cause the apparatus to:
• send, to a mobility management function entity, a first session establishment request for establishing a first session served by a first session management function entity;
• receive, from the first session management function entity, a session re-establishment indication from the first session management function entity;
• and
• send, to the mobility management function entity and in response to the session re-establishment indication, a second session establishment request for establishing a second session,
• wherein the second session establishment request comprises a first identifier of the first session, and
• wherein the second session establishment request is for selecting a second session management function entity that is different from the first session management function entity and that is for the second session.