Method for assisting unregistered user device to access end-to-end call service of private network and communication system

1. A method for assisting an unregistered user device to access an end-to-end call service of a private network, which is suitable for a communication system using mobile edge computing, and the method comprising:

determining by a mobile edge computing server whether the user device that is not registered on the private network wants to initiate an emergency-call request; and

in response to determining that the user device that is not registered on the private network wants to initiate the emergency call, assisting the user device by the mobile edge computing server to access the end-to-end call service without being registered on the private network, comprising:

obtaining at least one preset service device corresponding to the end-to-end call service, wherein each of the at least one preset service device has been registered on the private network;

selecting a specific service device from the at least one preset service device by the mobile edge computing server, and sending a call-service request by the mobile edge computing server to the specific service device, wherein the specific service device sends a call-service response in response to the call-service request; and

in response to the call-service response, assisting the user device by the mobile edge computing server in performing an end-to-end call with the specific service device.

2. The method according to claim 1 , wherein the communication system further comprises the private network, and the method further comprises:

determining by the private network that an emergency-call session is established between the user device and the private network; and

in response to establishing the emergency-call session, sending session information associated with the emergency-call session by the private network to the mobile edge computing server.

3. The method according to claim 1 , wherein performing the end-to-end call with the specific service device comprises:

in response to the specific service device sending the call-service response, confirming by the mobile edge computing server through the private network that the specific service device has entered a call waiting state; and

sending an emergency-call response by the mobile edge computing server to the user device, wherein the emergency call responds to the request corresponding to the emergency call, and the user device performs the end-to-end call with the specific service device through the mobile edge computing server.

4. The method according to claim 2 , wherein in response to the mobile edge computing server receiving the session information of the emergency-call session, the mobile edge computing server determines that the user device that is not registered on the private network wants to initiate the emergency call.

5. The method according to claim 4 , further comprising:

in response to determining that the user device that is not registered on the private network wants to initiate the emergency call, analyzing a location of at least one preset service device by the mobile edge computing server based on the session information, wherein each of the at least one preset service device has been registered on the private network.

6. The method according to claim 2 , wherein the session information of the emergency-call session comprises at least one of an Internet protocol address of the user device, a session type, and a quality of service flow identifier.

7. The method according to claim 1 , wherein the specific service device is closest to the user device among the at least one preset service device.

8. A communication system for assisting an unregistered user device to access an end-to-end call service of a private network, comprising:

a mobile edge computing server, configured to:

determine whether the user device that is not registered on the private network wants to initiate an emergency-call request; and

in response to determining that the user device that is not registered on the private network wants to initiate the emergency call, assist the user device to access the end-to-end call service without being registered on the private network, comprising:

obtaining at least one preset service device corresponding to the end-to-end call service through a private service module corresponding to the end-to-end call service, wherein each of the at least one preset service device has been registered on the private network;

selecting a specific service device from the at least one preset service device through the private service module, and request a policy control function entity of the private network to send a call-service request to the specific service device through a policy/charging rule module of the mobile edge computing server, wherein the specific service device sends a call-service response in response to the call-service request; and

in response to the call-service response, triggering the private service module through the policy/charging rule module to assist the user device in performing an end-to-end call with the specific service device.

9. The communication system according to claim 8 , wherein the communication system further comprises the private network, and the private network is further configured to:

determine that an emergency-call session is established between the user device and the private network; and

in response to establishing the emergency-call session, send session information associated with the emergency-call session to the mobile edge computing server.

10. The communication system according to claim 9 , wherein the mobile edge computing server is configured to:

in response to the specific service device sending the call-service response, confirm by the mobile edge computing server through the private network that the specific service device has entered a call waiting state; and

send an emergency-call response by the mobile edge computing server to the user device, wherein the emergency call responds to the request corresponding to the emergency call, and the user device performs the end-to-end call with the specific service device through the mobile edge computing server.

11. The communication system according to claim 9 , wherein the mobile edge computing server is further configured to:

in response to receiving the session information of the emergency-call session, determine that the user device that is not registered on the private network wants to initiate the emergency call.

12. The communication system according to claim 11 , wherein the mobile edge computing server is further configured to:

in response to determining that the user device that is not registered on the private network wants to initiate the emergency call, analyze a location of the at least one preset service device by the mobile edge computing server based on the session information, wherein each of the at least one preset service device has been registered on the private network.

13. The communication system according to claim 9 , wherein the session information of the emergency-call session comprises at least one of an Internet protocol address of the user device, a session type, and a quality of service flow identifier.

14. The communication system according to claim 8 , wherein the specific service device is closest to the user device among the at least one preset service device.