Control method and local control plane device

1. A control method, comprising:

obtaining, by a local control plane device, context information of a user equipment from a remote control plane device according to an interaction process between the user equipment and the remote control plane device, wherein obtaining the context information comprises:

in the interaction process between the user equipment and the remote control plane device, forwarding, by the local control plane device, forwarding plane modification information from the remote control plane device to a gateway device, wherein the forwarding plane modification information carries the context information of the user equipment, and

obtaining, by the local control plane device, the context information of the user equipment by parsing the forwarding plane modification information; and

setting up, by the local control plane device according to the context information of the user equipment, a radio bearer between the user equipment and a base station in which a current camping cell of the user equipment is located.

2. The method according to claim 1 , wherein the interaction process comprises at least one of: an attach request process initiated by the user equipment and a packet data network connection setup process initiated by the user equipment.

3. The method according to claim 1 , wherein obtaining the context information comprises: in the interaction process between the user equipment and the remote control plane device, receiving, by the local control plane device, the context information of the user equipment from the remote control plane device.

4. The method according to claim 1 , wherein setting up the radio bearer comprises: in response to receiving a service request from the user equipment via the base station, sending, by the local control plane device according to the context information of the user equipment, a context setup request to the base station.

5. The method according to claim 4 , wherein before the local control plane device receives the service request, the method further comprises:

in response to receiving a downlink data arrival notification message, initiating, by the local control plane device, paging to the user equipment according to the context information of the user equipment.

6. The method according to claim 1 , wherein after obtaining the context information, the method further comprises:

in response to receiving a context deletion request from the remote control plane device, deleting, by the local control plane device, the stored context information of the user equipment; and sending, by the local control plane device, the context deletion request to the gateway device.

7. The method according to claim 1 , wherein after setting up the radio bearer, the method further comprises:

sending, by the local control plane device, a user state modification notification to the remote control plane device, wherein the user state modification notification is used for modification of state information of the user equipment.

8. A local control plane device, comprising:

a transceiver; and

a processor configured to;

obtain context information of a user equipment from a remote control plane device according to an interaction process between the user equipment and the remote control plane device, including

in the interaction process between the user equipment and the remote control plane device, forwarding forwarding plane modification information from the remote control plane device to a gateway device, wherein the forwarding plane modification information carries the context information of the user equipment, and

obtaining the context information of the user equipment by parsing the forwarding plane modification information; and

set up, according to the context information of the user equipment, a radio bearer between the user equipment and a base station in which a current camping cell of the user equipment is located.

9. The local control plane device according to claim 8 , wherein the interaction process comprises at least one of: an attach request process initiated by the user equipment and a packet data network connection setup process initiated by the user equipment.

10. The local control plane device according to claim 8 , wherein the transceiver is configured to receive the context information of the user equipment from the remote control plane device.

11. The local control plane device according to claim 8 , wherein the processor is configured to: after a service request from the user equipment via the base station is received, send according to the context information of the user equipment, a context setup request to the base station.

12. The local control plane device according to claim 11 , wherein the processor is further configured to: after a downlink data arrival notification message is received, initiate paging to the user equipment according to the context information of the user equipment.

13. The local control plane device according to claim 8 , wherein the processor is further configured to: after a context deletion request from the remote control plane device is received, delete the stored context information of the user equipment; and send the context deletion request to the gateway device.

14. The local control plane device according to claim 8 , wherein the transceiver is further configured to send a user state modification notification to the remote control plane device, wherein the user state modification notification is used for modification of state information of the user equipment.

15. The local control plane device according to claim 8 , wherein the remote control plane device comprises: a mobility management entity of a evolved packet core (EPC) network architecture; or a central control plane device of a control-forwarding decoupling network architecture.

16. A wireless communications system, comprising:

a remote control plane device, configured to perform interaction process with a user equipment;

a gateway device; and

a local control plane, communicatively coupled to the remote control plane device and configured to;

obtain context information of the user equipment during the interaction process, including

in the interaction process between the user equipment and the remote control plane device, forwarding forwarding plane modification information from the remote control plane device to the gateway device, wherein the forwarding plane modification information carries the context information of the user equipment, and

obtaining the context information of the user equipment by parsing the forwarding plane modification information, and

set up a radio bearer between the user equipment and a base station in which a current camping cell of the user equipment is located according to the context information.

17. The system according to claim 16 , further comprising: the base station, configured to receive a context setup request from the local control plane device, and set up the radio bearer.

18. The system according to claim 16 , wherein the interaction process comprises at least one of: an attach request process initiated by the user equipment and a packet data network connection setup process initiated by the user equipment.

19. The system according to claim 16 , wherein the local control plane is configured to receive the context information of the user equipment from the remote control plane device.

20. The system according to claim 16 , wherein the local control plane is configured to: after a service request from the user equipment via the base station is received, send according to the context information of the user equipment, a context setup request to the base station.