Device using local server for V2X service
A device for a vehicle-to-everything (V2X) service selects a first local V2X server from multiple local V2X servers on the basis of current location. The device transmits a V2X service-related subscription request to the selected first local V2X server.
1. A device for vehicle-to-everything (V2X) service, the device comprising:
a processor; and
a memory operatively coupled with the processor and configured to store instructions that, when executed by the processor, cause the device to perform functions comprising:
receiving local server information and validity period information from a global V2X server, wherein the local server information includes a first management area managed by a first local V2X server, a second management area managed by a second local V2X server, and a boundary area being defined between the first management area and the second management area, and the validity period information indicates a period during which the local server information is valid;
when a publishing area where the device publishes a first V2X message carrying status information of the device overlaps with the boundary area, transmitting the first V2X message to both the first local V2X server and the second local V2X server so that each of the first local V2X server and the second local V2X server forwards the received first V2X message to another V2X device associated with the boundary area of a corresponding local V2X server;
when a part or all of an overlapped subscription area of the device overlaps with the boundary area, registering the overlapped subscription area to both the first local V2X server and the second local V2X server for requesting the first local V2X server and the second local V2X server to send a second V2X message of a provider device associated with the overlapped subscription area, wherein the second V2X message is associated with the overlapped subscription area if the provider device transmitting the second V2X message is located within the overlapped subscription area; and
receiving the second V2X message from at least one of the first local V2X server and the second local V2X server.
2. The device of claim 1 , wherein the functions further comprise:
receiving updated local server information from the global V2X server when the period indicated by the validity period information expires.
3. A method for vehicle-to-everything (V2X) service performed by a V2X device, the method comprising:
receiving local server information and validity period information from a global V2X server, wherein the local server information includes a first management area managed by a first local V2X server, a second management area managed by a second local V2X server, and a boundary area being defined between the first management area and the second management area, and the validity period information indicates a period during which the local server information is valid;
when a publishing area where the V2X device publishes a first V2X message carrying status information of the V2X device overlaps with the boundary area, transmitting the first V2X message to both the first local V2X server and the second local V2X server so that each of the first local V2X server and the second local V2X server forwards the received first V2X message to another V2X device associated with the boundary area of a corresponding local V2X server;
when a part or all of an overlapped subscription area of the V2X device overlaps with the boundary area, registering the overlapped subscription area to both the first local V2X server and the second local V2X server for requesting the first local V2X server and the second local V2X server to send a second V2X message of a provider device associated with the overlapped subscription area, wherein the second V2X message is associated with the overlapped subscription area if the provider device transmitting the second V2X message is located within the overlapped subscription area; and
receiving the second V2X message from at least one of the first local V2X server and the second local V2X server.