Method for adjusting multicast broadcast service area and network apparatus using the same

1. A method for adjusting a multicast broadcast service area, adapted for a network apparatus, the method comprising:

obtaining a cell list in a session update request message;

adjusting an old broadcast target area for a multicast broadcast service to a new broadcast target area for the multicast broadcast service according to the cell list, wherein the new broadcast target area is associated with a V2X message of a V2X service from a service content provider, and the V2X message comprising event-related information of a road event; and

controlling at least one base station to allocate or release radio spectrum resources for the multicast broadcast service,

wherein the cell list is determined according to the event-related information of the road event, and the event-related information of the road event comprises an event coordinate location and a broadcast range, wherein the cell list indicates multiple target base stations in the new broadcast target area.

2. The method for adjusting a multicast broadcast service area according to claim 1 , wherein the step of adjusting the old broadcast target area for the multicast broadcast service to the new broadcast target area for the multicast broadcast service according to the cell list comprises:

in response to the cell list comprising a first cell but the old broadcast target area not comprising the first cell, adjusting the old broadcast target area to the new broadcast target area by adding the first cell.

3. The method for adjusting a multicast broadcast service area according to claim 1 , wherein the step of controlling the base station to allocate or release the radio spectrum resources for the multicast broadcast service comprises:

sending a scheduling information message to control a first base station corresponding to the first cell to allocate the radio spectrum resources for the multicast broadcast service.

4. The method for adjusting a multicast broadcast service area according to claim 1 , wherein the step of adjusting the old broadcast target area for the multicast broadcast service to the new broadcast target area for the multicast broadcast service according to the cell list comprises:

in response to the old broadcast target area comprising a second cell but the cell list not comprising the second cell, adjusting the old broadcast target area to the new broadcast target area by removing the second cell.

5. The method for adjusting a multicast broadcast service area according to claim 4 , wherein the step of controlling the base station to allocate or release the radio spectrum resources for the multicast broadcast service comprises:

sending a scheduling information message to control a second base station corresponding to the second cell to release the radio spectrum resources for the multicast broadcast service.

6. The method for adjusting a multicast broadcast service area according to claim 1 , wherein before the step of obtaining the cell list in the session update request message, the method further comprises:

allocating a first resource pool belonging to a first mode and a second resource pool belonging to a second mode, wherein resource elements in the first resource pool are configured to transmit a broadcast service content of the multicast broadcast service, resource elements in the second resource pool are configured to transmit a broadcast service content of another multicast broadcast service, the multicast broadcast service belongs to the first mode, and the another multicast broadcast service belongs to the second mode.

7. The method for adjusting a multicast broadcast service area according to claim 6 , wherein the step of controlling the base station to allocate or release the radio spectrum resources for the multicast broadcast service comprises:

controlling the base station to allocate or release the resource elements in the first resource pool.

8. The method for adjusting a multicast broadcast service area according to claim 7 , wherein the target base station allocates the resource elements in the first resource pool to send a broadcast service content, and the target base station sends the broadcast service content according to the same resource elements.

9. The method for adjusting a multicast broadcast service area according to claim 7 , wherein before the step of obtaining the cell list in the session update request message, the method further comprises:

obtaining a flag in a session start request message of the multicast broadcast service to determine that the multicast broadcast service belongs to one of the first mode and the second mode according to the flag; and

in response to the flag matching a predetermined value, determining that the multicast broadcast service belongs to the first mode and suspending the multicast broadcast service.

10. A network apparatus comprising:

a transceiver; and

a processor coupled to the transceiver, wherein the processor is configured to:

obtain a cell list in a session update request message,

adjust an old broadcast target area for a multicast broadcast service to a new broadcast target area for the multicast broadcast service according to the cell list, wherein the new broadcast target area is associated with a V2X message of a V2X service from a service content provider, and the V2X message comprising event-related information of a road event, and

control at least one base station to allocate or release radio spectrum resources for the multicast broadcast service,

wherein the cell list is determined according to the event-related information of the road event, and the event-related information of the road event comprises an event coordinate location and a broadcast range, wherein the cell list indicates multiple target base stations in the new broadcast target area.

11. The network apparatus according to claim 10 , wherein the processor is configured to:

in response to the cell list comprising a first cell but the old broadcast target area not comprising the first cell, adjust the old broadcast target area to the new broadcast target area by adding the first cell.

12. The network apparatus according to claim 11 , wherein the processor is configured to:

send, by using the transceiver, a scheduling information message to control a first base station corresponding to the first cell to allocate the radio spectrum resources for the multicast broadcast service.

13. The network apparatus according to claim 10 , wherein the processor is configured to:

in response to the old broadcast target area comprising a second cell but the cell list not comprising the second cell, adjust the old broadcast target area to the new broadcast target area by removing the second cell.

14. The network apparatus according to claim 13 , wherein the processor is configured to:

send, by using the transceiver, a scheduling information message to control a second base station corresponding to the second cell to release the radio spectrum resources for the multicast broadcast service.

15. The network apparatus according to claim 10 , wherein the processor is configured to:

allocate a first resource pool belonging to a first mode and a second resource pool belonging to a second mode, wherein resource elements in the first resource pool transmit a broadcast service content of the multicast broadcast service, resource elements in the second resource pool transmit a broadcast service content of another multicast broadcast service, the multicast broadcast service belongs to the first mode, and the another multicast broadcast service belongs to the second mode.

16. The network apparatus according to claim 15 , wherein the processor is configured to:

control the base station to allocate or release the resource elements in the first resource pool.

17. The network apparatus according to claim 16 , wherein the target base station allocates the resource elements in the first resource pool to send a broadcast service content, and the target base station sends the broadcast service content according to the same resource elements.

18. The network apparatus according to claim 15 , wherein the processor is configured to:

obtain a flag in a session start request message of the multicast broadcast service to determine that the multicast broadcast service belongs to one of the first mode and the second mode according to the flag, and

in response to the flag matching a predetermined value, determine that the multicast broadcast service belongs to the first mode and suspend the multicast broadcast service.