Control signaling transmission method and device

1. A method of control signaling transmission, comprising:

receiving and saving, by a forwarder from a controller, a processing rule related to a mobile context of a user equipment, wherein the processing rule related to the mobile context of the user equipment is determined by the controller according to a route between the forwarder and a service network element, or a route between the forwarder and a target network element, the service network element is a network element serving the user equipment, and the target network element is a network element to which the mobile context of the user equipment belongs;

receiving, by the forwarder, control signaling carrying rule matching information, wherein the rule matching information comprises classification information and an identifier of the mobile context of the user equipment;

obtaining, by the forwarder according to the rule matching information, a processing rule corresponding to the rule matching information, wherein the processing rule comprises rule description information and forwarding routing information, the processing rule corresponding to the rule matching information is a processing rule whose rule description information matches the rule matching information, and the match between the rule description information and the rule matching information comprises: a match between classification information in the rule description information and the classification information in the rule matching information, and a match between an identifier of a mobile context of user equipment in the rule description information and the identifier of the mobile context of the user equipment in the rule matching information; and

forwarding, by the forwarder, the control signaling to a next-hop network element according to the forwarding routing information of the obtained processing rule.

2. The method according to claim 1 , further comprising:

when the mobile context of the user equipment is migrated from an original target network element to a new target network element, receiving, by the forwarder, the processing rule from the controller and that is related to the mobile context of the user equipment; and updating, according to the received processing rule, a processing rule that is locally saved by the forwarder and that is related to the mobile context of the user equipment; wherein the processing rule received by the forwarder is determined by the controller according to a route between the forwarder and the new target network element, and the new target network element is a network element to which the mobile context of the user equipment belongs after the mobile context of the user equipment is migrated.

3. The method according to claim 1 , wherein the obtaining, by the forwarder according to the rule matching information, a processing rule corresponding to the rule matching information comprises:

finding, by the forwarder from processing rules saved by the forwarder and according to the rule matching information, the processing rule corresponding to the rule matching information.

4. The method according to claim 3 , wherein the finding, by the forwarder from processing rules saved by the forwarder and according to the rule matching information, the processing rule corresponding to the rule matching information comprises:

searching, by the forwarder according to the rule matching information, rule description information in the processing rules saved by the forwarder; finding rule description information matching the rule matching information; and using a processing rule comprising the found rule description information as the processing rule corresponding to the rule matching information.

5. The method according to claim 1 , wherein the obtaining, by the forwarder according to the rule matching information, a processing rule corresponding to the rule matching information comprises:

sending, by the forwarder, a processing rule query request to a controller, wherein the request carries the rule matching information, and the processing rule query request is used to request the processing rule corresponding to the rule matching information; and

receiving, by the forwarder, the processing rule that is sent by the controller and that corresponds to the rule matching information.

6. The method according to claim 1 , wherein the forwarding routing information of the processing rule comprises a forwarding port; and

the forwarding, by the forwarder, the control signaling to a next-hop network element according to the forwarding routing information of the obtained processing rule comprises:

forwarding, by the forwarder, the control signaling to the next-hop network element by using the forwarding port.

7. The method according to claim 1 , wherein the identifier of the mobile context of the user equipment comprises: an international mobile subscriber identity (IMSI) or a packet temporary mobile subscriber identity (P-TMSI) of the user equipment.

8. The method according to claim 1 , wherein the classification information comprises a network element type of a destination network element for the control signaling, or a signaling type of the control signaling.

9. A non-transitory computer-readable storage medium comprising instructions which, when executed by a computer, cause the computer to carry out a method of control signaling transmission, comprising:

receiving and saving, by a forwarder from a controller, a processing rule related to a mobile context of a user equipment, wherein the processing rule related to the mobile context of the user equipment is determined by the controller according to a route between the forwarder and a service network element, or a route between the forwarder and a target network element, the service network element is a network element serving the user equipment, and the target network element is a network element to which the mobile context of the user equipment belongs;

receiving, by the forwarder, control signaling carrying rule matching information, wherein the rule matching information comprises classification information and an identifier of the mobile context of the user equipment;

obtaining, by the forwarder according to the rule matching information, a processing rule corresponding to the rule matching information, wherein the processing rule comprises rule description information and forwarding routing information, the processing rule corresponding to the rule matching information is a processing rule whose rule description information matches the rule matching information, and the match between the rule description information and the rule matching information comprises: a match between classification information in the rule description information and the classification information in the rule matching information, and a match between an identifier of a mobile context of user equipment in the rule description information and the identifier of the mobile context of the user equipment in the rule matching information; and

forwarding, by the forwarder, the control signaling to a next-hop network element according to the forwarding routing information of the obtained processing rule.

10. A forwarder, comprising:

a receiver, configured to:

receive from a controller a processing rule related to a mobile context of user equipment, wherein the processing rule related to the mobile context of the user equipment is determined by the controller according to a route between the forwarder and a service network element, or a route between the forwarder and a target network element, the service network element is a network element serving the user equipment, and the target network element is a network element to which the mobile context of the user equipment belongs; and

receive control signaling carrying rule matching information, wherein the rule matching information comprises classification information and an identifier of the mobile context of the user equipment;

a memory, configured to save the processing rule received by the receiver;

a processor, configured to obtain, according to the rule matching information received by the receiver, a processing rule corresponding to the rule matching information, wherein the processing rule comprises rule description information and forwarding routing information, the processing rule corresponding to the rule matching information is a processing rule whose rule description information matches the rule matching information, and the match between the rule description information and the rule matching information comprises: a match between classification information in the rule description information and the classification information in the rule matching information, and a match between an identifier of a mobile context of user equipment in the rule description information and the identifier of the mobile context of the user equipment in the rule matching information; and

a transmitter, configured to forward, according to the forwarding routing information of the processing rule obtained by the processor, the control signaling received by the receiver to a next-hop network element for the control signaling.

11. The forwarder according to claim 10 , wherein the receiver is configured to: when the mobile context of the user equipment is migrated from an original target network element to a new target network element, receive the processing rule that is sent by the controller and that is related to the mobile context of the user equipment; and

the memory is configured to update, according to the processing rule, the processing rule that is saved by the memory and that is related to the mobile context of the user equipment; wherein the processing rule received by the receiver is determined by the controller according to a route between the forwarder and the new target network element, and the new target network element is a network element to which the mobile context of the user equipment belongs after the mobile context of the user equipment is migrated.

12. The forwarder according to claim 10 , wherein the processor is configured to find, from processing rules saved by the memory and according to the rule matching information, the processing rule corresponding to the rule matching information.

13. The forwarder according to claim 12 , wherein the processor is configured to: search, according to the rule matching information, rule description information in the processing rules saved by the memory; find rule description information matching the rule matching information; and use a processing rule comprising the found rule description information as the processing rule corresponding to the rule matching information.

14. The forwarder according to claim 10 , wherein the processor is configured to: send a processing rule query request to a controller, wherein the request carries the rule matching information; and receive the processing rule that is sent by the controller and that corresponds to the rule matching information.

15. The forwarder according to claim 10 , wherein the forwarding routing information of the processing rule comprises a forwarding port; and the transmitter is configured to forward, by using the forwarding port, the control signaling received by the receiver, so as to forward the control signaling to the next-hop network element.

16. The forwarder according to claim 10 , wherein the identifier of the mobile context of the user equipment comprises: an international mobile subscriber identity (IMSI) or a packet temporary mobile subscriber identity (P-TMSI) of the user equipment.

17. The forwarder according to claim 10 , wherein the classification information comprises a network element type of a destination network element for the control signaling, or a signaling type of the control signaling.

18. The forwarder according to claim 17 , wherein the network element type of the destination network element for the control signaling comprises: a mobility management entity (MME) or an evolved NodeB (eNB); or the network element type of the destination network element for the control signaling comprises: a target network element or a service network element; or

the signaling type of the control signaling comprises: a service request or a service response.