Session handling method, communications apparatus, and communications system

A communications apparatus, comprising:

• at least one processor;
• and
• a communications interface coupled to the at least one processor,
• wherein the communications interface is configured to receive a request message from an intermediate session management function, wherein the request message comprises a session identifier, and the intermediate session management function is an session management function selected by an access and mobility management function when UE moves outside of a service area of the communications apparatus, and
• wherein the at least one processor is configured to, when a session corresponding to the session identifier is a local area data network session, reject the session corresponding to the session identifier.

A communications system, comprising:

• an anchor session management function;
• and
• an intermediate session management function, wherein
• the intermediate session management function is configured to send a request message to the anchor session management function, and
• the anchor session management function is configured to:
• receive a request message sent by an intermediate session management function, wherein the request message comprises a session identifier, and the intermediate session management function is an session management function selected by an access and mobility management function when UE moves outside of a service area of the anchor session management function;
• and
• when a session corresponding to the session identifier is a local area data network (LADN) session, reject the session corresponding to the session identifier.