Voice resource saving method, device, and system

1. A voice resource saving method, comprising:

receiving, by a mobility management entity (MME) from a mobile switching center (MSC), a first paging request message that is used to page a user equipment (UE), wherein the first paging request message comprises first indication information indicating a non-voice service, wherein the non-voice service comprises one of a location service (LCS) or an unstructured supplementary service data (USSD);

sending, by the MME, a second paging message to the UE indicating the non-voice service;

receiving, by the MME, from the UE, a message containing an extended service request to request a circuit switched (CS) fallback (CSFB) to perform the non-voice service;

sending, by the MME, a notification message to an evolved NodeB (eNodeB) in response to the message containing the extended service request, wherein the notification message instructs the eNodeB not to hand over, for the non-voice service, the UE from a Long Term Evolution (LTE) network to a circuit switched (CS) domain of a second generation (2G) or a third generation (3G) network;

receiving, by the MME from the eNodeB, a message indicating that handover of the UE is required to perform the non-voice service; and

sending, by the MME to the eNodeB, a handover required response message that includes information about radio resources of the CS domain that the eNodeB uses to command the UE to either be handed over from a Long Term Evolution (LTE) network to a packet switched (PS) domain of the 2G or 3G network, or the UE is to be moved from the LTE network to the 2G or 3G network by a redirection procedure, wherein a voice resource is released in response to the UE being handed over or moved from the LTE network to the 2G or 3G network.

2. The method according to claim 1 , wherein the notification message comprises second indication information indicating the non-voice service.

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

sending, by the MME, a second paging request message to the UE; and

receiving, by the MME, a service request from the UE, wherein the service request is used to request a circuit switched fallback (CSFB) for a circuit domain service.

4. The method according to claim 1 wherein completion of the handover from the LTE network to the CS domain of the 2G or 3G network to perform the non-voice service results in a bearer release being sent by the MSC to a base station to release voice resources.

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

receiving, by the eNodeB located in the LTE network, the notification message from the MME; and

sending, by the eNodeB to the MME in response to the notification message, a handover required message for handing over the UE from the LTE network to a packet switched (PS) domain of the 2G or 3G network.

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

receiving, by the eNodeB located in the LTE network, the notification message from the MME; and

sending, by the eNodeB in response to the notification message, a redirection request to the UE.

7. A mobility management entity (MME), comprising:

a receiver, configured to receive, from a mobile switching center (MSC), a first paging request message that is used to page a user equipment (UE), wherein the first paging request message comprises first indication information indicating a non-voice service, wherein the non-voice service comprises one of a location service (LCS) or an unstructured supplementary service data (USSD);

a transmitter, configured to send a second paging request to the UE indicating the non-voice service;

the receiver further configured to receive a service request from the UE to request a circuit switched fallback (CSFB) to perform the non-voice service;

the transmitter further configured to send a notification message to an evolved NodeB (eNodeB) in response to the received message containing the extended service request, wherein the notification message instructs the eNodeB not to hand over, for the non-voice service, the UE from a Long Term Evolution (LTE) network to a circuit switched (CS) domain of a second generation (2G) or a third generation (3G) network;

the receiver further configured to receive, from the eNodeB, a message indicating that handover of the UE is required to perform the non-voice service; and

the transmitter further configured to send, to the eNodeB, a handover required response message that includes information about radio resources of the CS domain that the eNodeB uses to command the UE to either be handed over from a Long Term Evolution (LTE) network to a packet switched (PS) domain of the 2G or 3G network, or the UE is to be moved from the LTE network to the 2G or 3G network by a redirection procedure, wherein a voice resource is released in response to the UE being handed over or moved from the LTE network to the 2G or 3G network.

8. The MME according to claim 7 , wherein the notification message comprises second indication information indicating the non-voice service.

9. The MME according to claim 8 , wherein

the transmitter is further configured to send a second paging request message to the UE; and

the receiver is further configured to receive a service request from the UE, wherein the service request is used to request a circuit switched fallback (CSFB) for a circuit domain service.

10. The MME according to claim 7 , wherein completion of the handover from the LTE network to the CS domain of the 2G or 3G network to perform the non-voice service results in a bearer release being sent by the MSC to a base station to release voice resources.

11. A voice resource saving system, comprising:

a mobility management entity (MME), that receives, from a mobile switching center (MSC), a first paging request message that is used to page a user equipment (UE), wherein the first paging request message comprises first indication information indicating a non-voice service, wherein the non-voice service comprises one of a location service (LCS) or an unstructured supplementary service data (USSD); the MME sends a second paging request to the UE indicating the non-voice service; the MME receives a service request from the UE to request a circuit-switched fallback (CSFB) to perform the non-voice service; and the MME sends a notification message to an evolved NodeB (eNodeB) in response to the message containing the extended service request, wherein the notification message instructs the eNodeB not to handover, for the non-voice service, the UE from a Long Term Evolution (LTE) network to a circuit switched (CS) domain of a second generation (2G) or a third generation (3G) network;

the evolved NodeB (eNodeB), that receives the notification message from the MME indicating that handover of the UE is required to perform the non-voice service; and

the MME sends to the eNodeB, in response to the received notification message, a redirection request to the UE, or a handover required message to the MME for a handover from a Long Term Evolution (LTE) network to a packet switched (PS) domain or a circuit switched domain of the 2G or 3G network, wherein a voice resource is released in response to the UE being handed over or moved from the LTE network to the 2G or 3G network.

12. The system according to claim 11 , wherein the notification message is used to instruct the eNodeB not to hand over, for the non-voice service, the UE from the LTE network to a circuit switched (CS) domain of the 2G or 3G network.

13. The system according to claim 11 , wherein the notification message comprises second indication information indicating the non-voice service.

14. The system according to claim 11 , wherein completion of the handover from the LTE network to the CS or PS domain of the 2G or 3G network to perform the non-voice service results in a bearer release being sent by the MSC to a base station to release voice resources.