Proximity service communication method, management network element, terminal device, and communication system

A proximity service communication method, comprising:

• sending, by a terminal device, a request message to a management network element device, wherein the request message comprises information about a first application, the request message requests a proximity service discovery parameter of the first application, and the proximity service discovery parameter is to be used by the terminal device to discover another terminal device that uses the first application;
• receiving, by the terminal device, the proximity service discovery parameter from the management network element device;
• establishing, by the terminal device based on the proximity service discovery parameter, a first sidelink with the another terminal device that uses the first application, and obtaining, by the terminal device from an access network device, a communication resource corresponding to the first sidelink;
• and
• in response to the terminal device not in a first geographic area, receiving, by the terminal device, a first update message from the management network element device, wherein the first update message notifies the terminal device that the proximity service discovery parameter becomes invalid, and the first geographic area is a geographic area in which the terminal device is allowed to use the first application through a sidelink.

A communication apparatus, comprising:

• at least one processor;
• and
• one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to cause the communication apparatus to perform operations comprising:
• receiving a request message from a terminal device, wherein the request message comprises information about a first application, the request message requests a proximity service discovery parameter of the first application, and the proximity service discovery parameter is to be used by the terminal device to discover another terminal device that uses the first application;
• obtaining (i) information about a first geographic area in which the terminal device is allowed to use the first application through a sidelink and (ii) location information of the terminal device;
• and
• in response to a geographic area indicated by the location information located in the first geographic area, sending the proximity service discovery parameter to the terminal device.

A terminal device, comprising:

• at least one processor;
• and
• one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to cause the terminal device to perform operations comprising:
• sending a request message to a management network element device, wherein the request message comprises information about a first application, the request message requests a proximity service discovery parameter of the first application, and the proximity service discovery parameter is to be used by the terminal device to discover another terminal device that uses the first application;
• receiving the proximity service discovery parameter from the management network element device;
• establishing, based on the proximity service discovery parameter, a first sidelink with the another terminal device that uses the first application, and obtaining, from an access network device, a communication resource corresponding to the first sidelink;
• and
• in response to the terminal device not in a first geographic area, receiving a first update message from the management network element device, wherein the first update message notifies the terminal device that the proximity service discovery parameter becomes invalid, and the first geographic area is a geographic area in which the terminal device is allowed to use the first application through a sidelink.