SERVER AND METHOD FOR VIDEO CALL HANDOVER ADAPTABILITY

1 . A computer-implemented method, executable by a processor of a service centralization and continuity (SCC) application server, the method comprising:

acquiring a first circuit switching (CS) video call parameter of an user equipment (UE) after the UE establishes a video call within a packet switching (PS) domain;

acquiring an address of a mobile switching center (MSC) server corresponding to the UE according to a position of the UE;

searching for the address of the MSC server in an information table to determine whether the MSC server is recorded;

reading a second CS video call parameter of the MSC server from the information table, in response to that the MSC server is recorded in the information table;

comparing the first CS video call parameter with the second CS video call parameter to discover any common parameter;

when a common parameter is discovered, detecting, via a mobility management entity (MME), whether the video call of the UE is transferred from the PS domain to a CS domain;

transmitting the common parameter to the MSC server in response to that the video call of the UE is transferred from the PS domain to the CS domain;

receiving a confirmed parameter from the MSC server; and

transmitting the confirmed parameter to the UE to re-establish the video call within the CS domain.

2 . The method as claimed in claim 1 , further comprising:

transmitting the first CS video call parameter of the UE to the MSC server to perform a pre-negotiation to the CS video call parameter, in response to that the MSC server is not recorded in the information table or no common parameter is discovered;

receiving a pre-negotiated CS video call parameter from the MSC server;

storing the pre-negotiated CS video call parameter into the information table;

detecting, via the MME, whether the video call of the UE is transferred from the PS domain to the CS domain; and

transmitting the pre-negotiated CS video call parameter to the UE to re-establish the video call within the CS domain, in response to that the video call of the UE is transferred from the PS domain to the CS domain.

3 . The method as claimed in claim 1 , wherein the information table records CS video call parameters corresponding to each MSC server, wherein the CS video call parameters are outputs of pre-negotiations between multiple MSC servers and multiple UEs.

4 . The method as claimed in claim 3 , further comprising:

updating the information table according to the confirmed parameter in response to that the confirmed parameter is different from the common parameter.

5 . The method as claimed in claim 1 , wherein the UE establishes the video call using a 3G-324M standard, and the first and second CS video call parameters comply with the 3G-324M standard.

6 . A non-transitory storage medium, storing a set of instructions, the set of instructions being executed by a processor of a service centralization and continuity (SCC) application server, to perform a method comprising:

acquiring a first circuit switching (CS) video call parameter of an user equipment (UE) after the UE establishes a video call within a packet switching (PS) domain;

acquiring an address of a mobile switching center (MSC) server corresponding to the UE according to a position of the UE;

searching for the address of the MSC server in an information table to determine whether the MSC server is recorded;

reading a second CS video call parameter of the MSC server from the information table, in response to that the MSC server is recorded in the information table;

comparing the first CS video call parameter with the second CS video call parameter to discover any common parameter;

when a common parameter is discovered, detecting, via a mobility management entity (MME), whether the video call of the UE is transferred from the PS domain to a CS domain;

transmitting the common parameter to the MSC server in response to that the video call of the UE is transferred from the PS domain to the CS domain;

receiving a confirmed parameter from the MSC server; and

transmitting the confirmed parameter to the UE to re-establish the video call within the CS domain.

7 . The non-transitory storage medium as claimed in claim 6 , wherein the method further comprises:

transmitting the first CS video call parameter of the UE to the MSC server to perform a pre-negotiation to the CS video call parameter, in response to that the MSC server is not recorded in the information table or no common parameter is discovered;

receiving a pre-negotiated CS video call parameter from the MSC server;

storing the pre-negotiated CS video call parameter into the information table;

detecting, via the MME, whether the video call of the UE is transferred from the PS domain to the CS domain; and

transmitting the pre-negotiated CS video call parameter to the UE to re-establish the video call within the CS domain, in response to that the video call of the UE is transferred from the PS domain to the CS domain.

8 . The non-transitory storage medium as claimed in claim 6 , wherein the information table records CS video call parameters corresponding to each MSC server, wherein the CS video call parameters are outputs of pre-negotiations between multiple MSC servers and multiple UEs.

9 . The non-transitory storage medium as claimed in claim 8 , wherein the method further comprises:

updating the information table according to the confirmed parameter in response to that the confirmed parameter is different from the common parameter.

10 . The non-transitory storage medium as claimed in claim 6 , wherein the UE establishes the video call using a 3G-324M standard, and the first and second CS video call parameters comply with the 3G-324M standard.

11 . A server, the server comprising:

a processor;

memory storing instructions,

wherein the instructions are executed on the processor to cause the processor to:

acquire a first circuit switching (CS) video call parameter of an user equipment (UE) after the UE establishes a video call within a packet switching (PS) domain;

acquire an address of a mobile switching center (MSC) server corresponding to the UE according to a position of the UE;

search for the address of the MSC server in an information table to determine whether the MSC server is recorded;

read a second CS video call parameter of the MSC server from the information table, in response to that the MSC server is recorded in the information table;

compare the first CS video call parameter with the second CS video call parameter to discover any common parameter;

when a common parameter is discovered, detect, via a mobility management entity (MME), whether the video call of the UE is transferred from the PS domain to a CS domain;

transmit the common parameter to the MSC server in response to that the video call of the UE is transferred from the PS domain to the CS domain;

receive a confirmed parameter from the MSC server; and

transmit the confirmed parameter to the UE to re-establish the video call within the CS domain.

12 . The server as claimed in claim 11 , wherein the instructions executed on the processor further causes the processor to:

transmit the first CS video call parameter of the UE to the MSC server to perform a pre-negotiation to the CS video call parameter, in response to that the MSC server is not recorded in the information table or no common parameter is discovered;

receive a pre-negotiated CS video call parameter from the MSC server;

store the pre-negotiated CS video call parameter into the information table;

detect, via the MME, whether the video call of the UE is transferred from the PS domain to the CS domain; and

transmit the pre-negotiated CS video call parameter to the UE to re-establish the video call within the CS domain, in response to that the video call of the UE is transferred from the PS domain to the CS domain.

13 . The server as claimed in claim 11 , wherein the information table records CS video call parameters corresponding to each MSC server, wherein the CS video call parameters are outputs of pre-negotiations between multiple MSC servers and multiple UEs.

14 . The server as claimed in claim 13 , wherein the instructions executed on the processor further causes the processor to:

update the information table according to the confirmed parameter in response to that the confirmed parameter is different from the common parameter.

15 . The server as claimed in claim 11 , wherein the first and second CS video call parameters comply with a 3G-324M standard.