CN103024846B - Business switching method, mobile terminal and mobile switching center - Google Patents

Abstract

The invention relates to the technical field of communication, in particular to a business switching method, a mobile terminal and a mobile switching center. The method includes that the mobile terminal receives a circuit switching domain fallback (CFSB) instruction sent by a mobile management entity (MME), falls back from a long term evolution (LTE) to a circuit switch (CS) domain according to the CSFB instruction and performs a first CS business in the CS domain, and receives an instruction of delayed return to the LTE domain sent by the mobile switching center (MSC), wherein the instruction is used for indicating the mobile terminal to continue to reside in the CS domain after completing the first CS business, and the mobile terminal continues to reside in the CS domain according to the instruction of delayed return to the LTE domain and performs a second CS business in the CS domain, and returns to the LTE domain after the second CS business is finished.

Description

A service switching method, mobile terminal and mobile switching center

technical field

The invention relates to the technical field of communication, in particular to a service switching method, a mobile terminal and a mobile switching center.

Background technique

At present, the mobile communication network has developed from the 2/3G network to the Long Term Evolution (LTE) network. In order to maximize the use of resources such as the coverage and service quality of the existing 2/3G network, protect the operator's investment and maximize the benefits. The core network of the long-term evolution (Long Term Evolution, LTE) system only retains the packet (Packet Switched, PS) domain, which is called the evolved packet core (Evolved Packet Core, EPC) network. The evolved packet core network mainly includes MME, service gateway (Serving Gateway, S-GW), packet data network gateway (Packet Data Network Gateway, PGW) three logical entities. The wireless access network of the LTE system is the Evolved Universal Terrestrial Radio Access Network (Evolved Universal Terrestrial Radio Access Network, E-UTRAN). In addition, user equipment can also pass through the GSM/EDGE Radio Access Network (GSM EDGE Radio Access Network, GERAN) Or the Universal Terrestrial Radio Access Network (UTRAN) (abbreviated as GERAN/UTRAN) accesses the evolved packet core network.

In the initial stage of LTE network deployment, LTE is generally used as hotspot coverage, mainly for data services, such as short message services; services related to the Circuit Switch (CS) domain (calls, supplementary services, etc.) are still carried out on the 2/3G network. CS Fallback (CSFB) realizes this function, so that when a mobile terminal camps on the LTE network, it can fall back to the CS domain to perform CS-related services, and automatically and quickly return to the LTE network after the CS service is completed.

Through the analysis of the prior art, the inventor believes that the prior art has at least the following problems:

According to the existing CSFB solution, after falling back to the CS domain for one CS service, if there are one or more CS services immediately after, the mobile terminal still needs to return to the LTE network, and then fall back to the CS domain network for the second CS service. CS service, which increases the delay and signaling overhead of subsequent services.

Contents of the invention

In order to overcome the defects of the prior art, the purpose of the embodiments of the present invention is to provide a service switching method, a mobile terminal and a mobile switching center, so that in a CSFB scenario, after a mobile terminal performs a CS service, it needs to perform subsequent CS services one after another. , avoiding the time delay and signaling overhead caused by multiple handovers.

In a first aspect, an embodiment of the present invention provides a method for service switching, including:

The mobile terminal receives the circuit domain fallback CSFB instruction sent by the mobility management entity MME, falls back from the long term evolution LTE domain to the circuit switched CS domain according to the CSFB instruction, and performs the first CS service in the CS domain;

receiving an instruction to delay returning to the LTE domain sent by the mobile switching center MSC, the instruction being used to instruct the mobile terminal to continue to reside in the CS domain after completing the first CS service;

Continue to reside in the CS domain according to the instruction to delay returning to the LTE domain, and perform a second CS service in the CS domain;

The mobile terminal returns to the LTE domain.

In the first possible implementation of the first aspect, the MSC obtains the start time of the second CS service from the subscription data of the user corresponding to the mobile terminal and the first CS The difference between service end times is sent when the time difference is smaller than a predetermined time threshold.

In the second possible implementation of the first aspect, the MSC obtains the second CS corresponding to the service type of the first CS service according to the service type of the first CS service in the instruction of delaying the return to the LTE domain. The start time of the service is obtained from the difference between the start time of the second CS service and the end time of the first CS service, and is sent when the time difference is less than a predetermined time threshold.

In a second aspect, an embodiment of the present invention provides a mobile terminal, including:

A receiving unit, configured to receive a circuit domain fallback CSFB instruction sent by a mobility management entity MME;

A circuit domain fallback unit, configured to fall back from the Long Term Evolution LTE domain to the Circuit Switched CS domain according to the CSFB indication received by the receiving unit;

a CS service executing unit, configured to perform a first CS service in the CS domain after the mobile terminal falls back to the CS domain;

The receiving unit is further configured to receive an instruction to delay returning to the LTE domain sent by the mobile switching center MSC, the instruction is used to instruct the mobile terminal to continue to reside in the CS domain after completing the first CS service;

The CS service execution unit is further configured to continue to reside in the CS domain and perform a second CS service in the CS domain according to the instruction received by the receiving unit to delay returning to the LTE domain;

The return unit is used to return the LTE domain.

In the first possible implementation of the second aspect, the receiving unit receives an instruction to delay returning to the LTE domain, and the MSC obtains the start time of the second CS service from the subscription data corresponding to the mobile terminal and the It is sent after the difference between the end times of the first CS service is less than a predetermined time threshold.

In a second possible implementation of the second aspect, the instruction received by the receiving unit to delay returning to the LTE domain is based on the service type of the first CS service and the service type of the first CS service configured by the MSC. The mapping relationship with the start time of the second CS service is obtained, and the difference between the start time of the second CS service and the end time of the first CS service is less than a predetermined time threshold and then sent.

In a third aspect, an embodiment of the present invention provides a mobile switching center, including:

The first circuit-switched CS service processing unit is configured to interact with the mobile terminal to perform the first CS service after the mobile terminal falls back from the Long Term Evolution LTE domain to the CS domain;

a sending unit, configured to send an instruction to delay returning to the LTE domain to the mobile terminal, where the instruction is used to instruct the mobile terminal to continue to reside in the CS domain after completing the first CS service;

The second CS service unit is configured to interact with the mobile terminal that continues to reside in the CS domain to perform a second CS service after the mobile terminal receives the instruction to delay returning to the LTE domain.

In a first possible implementation manner of the third aspect, the mobile switching center further includes:

An obtaining unit, configured to obtain the difference between the start time of the second CS service and the end time of the first CS service from the subscription data of the user corresponding to the mobile terminal, and notify when the time difference is less than a predetermined time threshold The sending unit sends the instruction to delay returning to the LTE domain.

In a second possible implementation manner of the third aspect, the mobile switching center further includes:

The obtaining unit is configured to obtain the start time of the second CS service corresponding to the service type of the first CS service according to the service type of the first CS service, and obtain the start time of the second CS service and the first CS service start time. The difference between service end times, when the time difference is less than a predetermined time threshold, notify the sending unit to send the delayed return to LTE domain instruction.

In the service switching method, mobile terminal, and mobile switching center provided by the embodiments of the present invention, after the mobile terminal performs a CS service and needs to perform subsequent CS services one after another, it delays returning to the LTE domain, avoiding unnecessary transfer from the CS domain to the mobile switching center. LTE domain, and the time delay and signaling overhead caused by falling back from the LTE domain to the CS domain for subsequent CS services.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a flowchart of a service switching method provided by an embodiment of the present invention;

FIG. 2 is a flowchart of another service switching method provided by an embodiment of the present invention;

FIG. 3 is a flowchart of another service switching method provided by an embodiment of the present invention;

FIG. 4 is a flowchart of another service switching method provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a mobile terminal provided by an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of another mobile terminal provided by an embodiment of the present invention.

FIG. 7 is a schematic structural diagram of a mobile switching center provided by an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of another mobile switching center provided by an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figure 1, it is a schematic diagram of a service switching method provided by an embodiment of the present invention, including:

S101. The mobile terminal receives the CSFB instruction sent by the mobility management entity MME, falls back to the CS domain, and performs the first CS service in the CS domain;

The mobile falls back from the LTE domain to the CS domain according to the CSFB instruction, and performs the first CS service in the CS domain.

S102. Receive an instruction from the mobile switching center MSC to delay returning to the LTE domain, the instruction is used to instruct the mobile terminal to continue to reside in the CS domain after completing the first CS service;

Here, the instruction to delay returning to the LTE domain may be sent after the MSC learns from the subscription data that the difference between the start time of the second CS service and the end time of the first CS service is less than a predetermined time threshold; specifically, the mobile terminal corresponds to The second CS service is set in the subscription data of the user, and the second CS service is a service to be continued within a predetermined time period after the end of the first CS service. Optionally, the subscription data of the user corresponding to the mobile terminal may also set a specific time when the second CS service starts to execute, and use this time to calculate the difference between the start time of the second CS service and the end time of the first CS service. Difference.

The MSC can also obtain the start time of the second CS service according to the service type of the first CS service and the mapping relationship between the service type of the first CS service and the start time of the second CS service configured by the MSC, and know the second CS service After the difference between the start time of the service and the end time of the first CS service is less than a predetermined time threshold, the instruction to delay returning to the LTE domain is sent.

S103, continue to reside in the CS domain according to the instruction to delay returning to the LTE domain, and perform a second CS service in the CS domain;

Specifically, the second CS service may be executed when the start time of the second CS service in the subscription data arrives.

S104, the mobile terminal returns to the LTE domain.

Specifically, the mobile terminal may return to the LTE domain after the second CS service ends. Optionally, when the third CS service needs to be performed immediately after the second CS service, the mobile terminal may judge the difference between the start time of the third CS service and the end time of the second CS service again after the end of the second CS service. Whether the difference is less than the predetermined time threshold, if it is less than the predetermined time threshold, the mobile terminal receives the instruction to delay returning to the LTE domain again, continues to reside in the CS domain, and completes the third CS service. For a specific method of judging whether the difference between the start time of the third CS service and the end time of the second CS service is less than a predetermined time threshold, reference may be made to the description of S102, and details are not repeated here. Certainly, the embodiment of the present invention is not limited to two or three CS services, and may also be more CS services, and the principle is the same as above.

In the embodiment of the present invention, when the difference between the start time of the second CS service and the end time of the first CS service is less than a predetermined time threshold, the mobile terminal receives an instruction to delay returning to the LTE domain, and after completing the first CS service, Stay in the CS domain to complete the second CS service, and then return to the LTE domain. The time delay and signaling overhead caused by unnecessary return from the CS domain to the LTE domain and fallback from the LTE domain to the CS domain to perform the second CS service are avoided.

As shown in Figure 2, an embodiment of the present invention provides a method for service switching, including:

S201, the mobile terminal sends an extended service request message to the MME via the evolved base station eNodeB;

The extended service request may include parameters to trigger the mobile terminal to perform CS domain fallback.

S202, the MME returns a modification request message to the eNodeB, carrying a CSFB indication;

S203, the eNodeB sends an RRC Release message to the mobile terminal;

Here, the RRC Release message carries a CSFB indication, notifying the mobile terminal to fall back to the CS domain.

S204, establishing a CS connection;

The mobile terminal establishes a CS connection with the MSC through the base station controller.

S205, performing the first CS service;

The MSC judges whether there is a second CS service after the first CS service ends. If there is no second CS service after the first CS service ends, go to S208, and the mobile terminal immediately returns to the LTE domain.

If there is a second CS service after the end of the first CS service, and the time difference between the start time of the second CS service and the end time of the first CS service is less than a predetermined time threshold, execute S206;

The specific judging method can be that the MSC obtains the subscription data of the user from the Home Location Register (Home Location Register, HLR) or the Visit Location Register (Visit Location Register, VLR) or the service control point (Service Control Point, SCP), from the subscription data can be It is known that there is a second CS service after the first CS service, and the difference between the start time of the second CS service and the end time of the first CS service can be obtained from the subscription data. When the time difference between the start time of the second CS service and the end time of the first CS service is less than a predetermined time threshold (such as less than 5 seconds), perform S206; the time threshold is less than the mobile terminal completing the first CS service After that, it directly returns to the LTE domain and falls back to the sum of the time spent in the CS domain.

In addition, the MSC can also obtain the start time of the second CS service according to its own configuration and the service type of the first CS service. Specifically, the MSC configures the mapping relationship between the service type of the first CS service and the start time of the second CS service, and obtains the start time of the second service through the service type of the first service, because the MSC can obtain the first CS service end time of the second CS service, and then it can be judged whether the time difference between the start time of the second CS service and the end time of the first CS service is less than a predetermined time threshold, and if less than the time threshold, perform S206;

It should be pointed out that the first CS service or the second CS service here refers to a complete CS service, such as a complete voice call process, or a complete supplementary service process.

S206, the MSC sends an instruction to the mobile terminal to return to the LTE domain with a delay;

The delayed return instruction to the LTE domain is used to inform the mobile terminal to continue to reside in the CS domain without immediately returning to the LTE domain after the first CS service is completed, and to continue the second CS service in the CS domain;

Specifically, the command to delay returning to the LTE domain may be carried by a ClearCommand message.

S207, performing a second CS service in the CS domain;

After receiving the instruction to delay returning to the LTE domain, the mobile terminal continues to reside in the CS domain, and performs the second CS service in the CS domain.

S208, the mobile terminal returns to the LTE domain.

After the second CS service ends, the mobile terminal returns to the LTE domain.

The above steps S201-S204 are the standard flow of falling back from the LTE domain to the CS domain, and S208 is also the standard flow of returning the CS domain to the LTE. Wherein, the method of returning to the LTE domain may be that the mobile terminal sends a tracking area update message to the MME, and the MME sends a location update request message to the MSC, accepts a location update response returned by the MSC, and then sends a tracking area update acceptance message to the mobile terminal, and the mobile terminal Return to the LTE domain.

Of course, if after the second CS service ends, there are still CS services in succession, after S207, refer to S205 to judge again the start time of the third CS service and the end time of the second CS service, if the start time of the third CS service If the time and the end time of the second CS service are less than the predetermined threshold, the mobile terminal continues to camp in the CS domain to perform the third CS service after completing the second CS service. Certainly, the embodiment of the present invention is not limited to two or three CS services, and may also be more CS services, and the principle is the same as above.

In this way, when the mobile terminal needs to perform two or more consecutive CS services, it delays returning to the LTE domain, thereby reducing unnecessary time delay and signaling caused by returning from the CS domain to LTE, and then falling back to CS from LTE overhead.

As shown in FIG. 3 , the embodiment of the present invention provides another method for service switching. After the mobile terminal completes the CS voice call service, it directly performs the Unstructured Supplementary Service Data (USSD) service without returning to LTE immediately. Specifically include:

S301, the mobile terminal sends an extended service request message to the MME via the eNodeB;

S302, the MME returns a modification request message to the eNodeB, carrying a CSFB indication;

S303, the eNodeB sends an RRC Release message to the mobile terminal;

Here, the RRC Release message carries a CSFB indication, notifying the mobile terminal to fall back to the CS domain.

S304, establishing a CS connection;

The mobile terminal establishes a CS connection with the MSC through the base station controller.

S305, performing a CS voice call service;

Specifically, MSC can obtain user subscription data from HLR or VLR or SCP. There is a field in the subscription information of this user, indicating that after the voice call service is completed, the user needs to know the status of the call charge, and needs to notify the user of the call charge status through the USSD service. Another field of the subscription information may indicate the time difference between the start time of the USSD service and the end of the CS voice call. When the time difference is less than the predetermined time threshold, S306 is executed next. Here, the USSD service is a supplementary service and also a CS service. Specifically, the process for the MSC to obtain the subscription data is a standard process, which will not be repeated in the present invention.

S306, the MSC sends to the mobile terminal an instruction to return to the LTE domain with a delay;

The delayed return to the LTE domain instruction is used to inform the mobile terminal to stay in the CS domain and not return to the LTE domain immediately after the CS voice call service is completed, and to continue the USSD service in the CS domain;

Specifically, the command to delay returning to the LTE domain may be carried by a ClearCommand message.

S307, performing USSD service;

According to the instruction sent by the MSC to delay returning to the LTE domain, the mobile terminal does not return to the LTE domain after the CS voice call service, and directly performs the USSD service to know the user's call charge status.

S308, return to the LTE domain.

After the USSD service ends, the mobile terminal returns to the LTE domain.

The specific method of returning to LTE can be a standard process. The mobile terminal sends a tracking area update message to the MME, and the MME sends a location update request message to the MSC, accepts the location update response returned by the MSC, and then sends a tracking area update acceptance message to the mobile terminal. The terminal returns to the LTE domain. The specific USSD service is also a standard process, and will not be repeated here.

Through the method of this embodiment, the mobile terminal does not return to LTE immediately after the CS voice call ends, but returns to the LTE domain after the completion of the USSD service, thereby reducing unnecessary return from the CS domain to the LTE domain, and LTE domain fallback. After arriving in the CS domain, USSD is performed, resulting in delay and signaling overhead.

As shown in FIG. 4 , the embodiment of the present invention provides yet another method for service switching. After the mobile terminal completes the USSD service, it directly conducts the voice call service and does not return to LTE immediately. Specifically include:

S401, the mobile terminal sends an extended service request message to the MME via the eNodeB;

S402, the MME returns a modification request message to the eNodeB, carrying a CSFB indication;

S403, the eNodeB sends an RRC Release message to the mobile terminal;

Here, the RRC Release message carries a CSFB indication, notifying the mobile terminal to fall back to the CS domain.

S404, establishing a CS connection;

The mobile terminal establishes a CS connection with the MSC through the base station controller.

S405, the mobile terminal performs the USSD service;

Specifically, the MSC can learn that the service type of the service is a USSD service by analyzing the USSD message. According to the mapping relationship between the service type of the USSD service configured by the MSC and the start time of the CS voice call service, the start time of the CS voice call service after the USSD service is known, because the MSC can obtain the end time of the USSD service, if the CS voice call service start time If the difference with the end time of the USSD service is less than the predetermined time threshold, S406 is executed.

Here, the predetermined time threshold should be less than the sum of the time it takes for the mobile terminal to return to the LTE domain and fall back to the CS domain again. In addition, the CS voice call service after the USSD service may be a callback service or a voice mailbox service, which is not limited in this embodiment of the present invention.

S406, the MSC sends to the mobile terminal an instruction to return to the LTE domain with a delay;

The delayed return instruction to the LTE domain is used to inform the mobile terminal to stay in the CS domain without immediately returning to the LTE domain after completing the USSD service, and to continue the CS voice call service in the CS domain;

Specifically, the command to delay returning to the LTE domain may be carried by a ClearCommand message.

S407, performing a CS voice call service;

According to the instruction sent by the MSC to return to the LTE domain with a delay, the mobile terminal does not return to the LTE domain after the USSD service, and directly performs the CS voice call service.

S408, return to the LTE domain.

After the CS voice call service ends, the mobile terminal returns to the LTE domain.

The specific method of returning to LTE can be as follows: the mobile terminal sends a tracking area update message to the MME, the MME sends a location update request message to the MSC, accepts the location update response returned by the MSC, and then sends a tracking area update acceptance message to the mobile terminal, and the mobile terminal returns to the LTE area.

Certainly, the embodiment of the present invention is not limited to the USSD service, and may also be other CS supplementary services.

Through the method of this embodiment, the mobile terminal does not return to LTE immediately after the USSD service ends, but returns to the LTE domain after the next CS voice call service is completed, thereby reducing unnecessary CS domain to LTE domain, and LTE The time delay and signaling overhead caused by falling back from the CS domain to the CS domain.

As shown in Figure 5, an embodiment of the present invention provides a mobile terminal, including:

The receiving unit 501 is configured to receive the CSFB indication sent by the MME;

A circuit domain fallback unit 502, configured to fall back from the Long Term Evolution LTE domain to the Circuit Switched CS domain according to the CSFB indication received by the receiving unit;

A CS service executing unit 503, configured to perform a first CS service in the CS domain after the mobile terminal falls back to the CS domain;

The receiving unit 501 is also configured to receive an instruction to delay returning to the LTE domain sent by the mobile switching center MSC, and the instruction is used to instruct the mobile terminal to continue camping in the CS domain after completing the first CS service;

The CS service execution unit 503 is further configured to continue to reside in the CS domain and perform a second CS service in the CS domain according to the instruction received by the receiving unit 501 to delay returning to the LTE domain;

The returning unit 504 is configured to return to the LTE domain after the second CS service ends.

Further, the receiving unit 501 receives an instruction to delay returning to the LTE domain, and the MSC learns from the subscription data the difference between the start time of the second CS service and the end time of the first CS service, when the time difference is less than the predetermined sent when the time threshold is reached; or

The receiving unit 501 receives the instruction to delay returning to the LTE domain, and the MSC learns the second CS service type according to the service type of the first CS service and the mapping relationship between the service type of the first CS service and the start time of the second CS service configured by the MSC. The start time of the CS service is obtained from the difference between the start time of the second CS service and the end time of the first CS service, and is sent when the time difference is smaller than a predetermined time threshold.

It should be pointed out that the above time threshold should be less than the sum of the time it takes for the mobile terminal to directly return to the LTE domain and fall back to the CS domain after completing the first CS service.

As shown in FIG. 6, it is a structural diagram of another mobile terminal provided by the embodiment of the present invention. As shown in FIG. 6, the mobile terminal includes at least one processor 601, a communication bus 602, a memory 603 and at least one communication interface 604.

Wherein, the communication bus 602 is used to realize connection and communication between the above components, and the communication interface 604 is used to connect and communicate with external devices.

Wherein, the memory 603 is used to store program codes that need to be executed. These program codes may specifically include: a circuit domain fallback unit 6031, a receiving unit 6032, a CS service execution unit 6033, and a return unit 6034. When the above units are executed by the processor When 601 is executed, the following functions are realized:

The receiving unit 6031 is configured to receive the CSFB indication sent by the MME;

A circuit domain fallback unit 6032, configured to fall back from the Long Term Evolution LTE domain to the Circuit Switched CS domain according to the CSFB indication received by the receiving unit;

A CS service executing unit 6033, configured to perform a first CS service in the CS domain after the mobile terminal falls back to the CS domain;

The receiving unit 6031 is also configured to receive an instruction to delay returning to the LTE domain sent by the mobile switching center MSC, and the instruction is used to instruct the mobile terminal to continue camping in the CS domain after completing the first CS service;

The CS service execution unit 6033 is further configured to continue to reside in the CS domain and perform a second CS service in the CS domain according to the instruction received by the receiving unit 6031 to delay returning to the LTE domain;

The returning unit 6034 is configured to return to the LTE domain after the second CS service ends.

Further, the receiving unit 6031 receives an instruction to delay returning to the LTE domain, and the MSC learns from the subscription data the difference between the start time of the second CS service and the end time of the first CS service, when the time difference is less than the predetermined sent when the time threshold is reached; or

The receiving unit 6031 receives the instruction to delay returning to the LTE domain, and the MSC learns the second CS service type according to the service type of the first CS service and the mapping relationship between the service type of the first CS service and the start time of the second CS service configured by the MSC. The start time of the CS service is obtained from the difference between the start time of the second CS service and the end time of the first CS service, and is sent when the time difference is smaller than a predetermined time threshold.

It should be pointed out that the above time threshold should be less than the sum of the time it takes for the mobile terminal to directly return to the LTE domain and fall back to the CS domain after completing the first CS service.

The mobile terminal provided by the embodiment of the present invention delays returning to the LTE domain when the mobile terminal needs to perform two or more consecutive CS services, thereby reducing unnecessary returning to the LTE from the CS domain and falling back to the CS from the LTE. The resulting delay and signaling overhead.

As shown in Figure 7, an embodiment of the present invention provides a mobile switching center, including:

The first CS service processing unit 701 is configured to interact with the mobile terminal to perform the first CS service after the mobile terminal falls back from the Long Term Evolution LTE domain to the CS domain;

A sending unit 702, configured to send an instruction to delay returning to the LTE domain to the mobile terminal, where the instruction is used to instruct the mobile terminal to continue camping in the CS domain after completing the first CS service;

The second CS service unit 703 is configured to interact with the mobile terminal that continues to reside in the CS domain to perform a second CS service after the mobile terminal receives the instruction to delay returning to the LTE domain.

Further, the mobile switching center may also include an acquisition unit, configured to:

Obtain the difference between the start time of the second CS service and the end time of the first CS service from the subscription data of the user corresponding to the mobile terminal, and notify the sending unit 702 when the time difference is less than a predetermined time threshold sending the instruction to delay returning to the LTE domain; or

According to the service type of the first CS service, obtain the start time of the second CS service corresponding to the service type of the first CS service, and obtain the difference between the start time of the second CS service and the end time of the first CS service , when the time difference is smaller than a predetermined time threshold, notify the sending unit 702 to send the delayed return to LTE domain instruction.

As shown in FIG. 8, it is a structural diagram of another mobile switching center provided by an embodiment of the present invention. As shown in FIG. 8, the mobile terminal includes at least one processor 801, a communication bus 802, a memory 803 and at least one communication Interface 804.

Wherein, the communication bus 802 is used to realize connection and communication between the above components, and the communication interface 804 is used to connect and communicate with external devices.

Wherein, the memory 803 is used to store program codes that need to be executed. These program codes may specifically include: a first CS service processing unit 8031, a sending unit 8032, and a second CS service processing unit 8033. When the above units are executed by the processor When 801 is executed, the following functions are realized:

The first CS service processing unit 701 is configured to interact with the mobile terminal to perform the first CS service after the mobile terminal falls back from the Long Term Evolution LTE domain to the CS domain;

A sending unit 702, configured to send an instruction to delay returning to the LTE domain to the mobile terminal, where the instruction is used to instruct the mobile terminal to continue camping in the CS domain after completing the first CS service;

The second CS service unit 703 is configured to interact with the mobile terminal that continues to reside in the CS domain to perform a second CS service after the mobile terminal receives the instruction to delay returning to the LTE domain.

In the mobile switching center provided by the embodiment of the present invention, when the mobile terminal needs to perform two or more CS services in succession, it sends a delayed return to the LTE domain to the mobile terminal, thereby reducing unnecessary return to LTE from the CS domain, and Delay and signaling overhead caused by LTE falling back to CS.

From the above description of the implementation manners, it can be seen that those skilled in the art can clearly understand that all or part of the steps in the methods of the above embodiments can be implemented by means of software plus a necessary general hardware platform. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products can be stored in storage media, such as ROM/RAM, disk , CD, etc., including several instructions to make a computer device (which may be a personal computer, server, or network device, etc.) execute the methods described in various embodiments or some parts of the embodiments of the present invention.

It should be noted that each embodiment in this specification is described in a progressive manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments. place. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the specific function execution process of each unit can refer to the part of the description of the method embodiment. The device embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place , or can also be distributed to multiple network elements. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment. It can be understood and implemented by those skilled in the art without creative effort.

In a word, the above descriptions are only preferred embodiments of the technical solutions of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (12)

1. A service switching method, characterized in that, comprising: The mobile terminal receives the circuit domain fallback CSFB instruction sent by the mobility management entity MME, falls back from the long term evolution LTE domain to the circuit switched CS domain according to the CSFB instruction, and performs the first CS service in the CS domain; receiving an instruction to delay returning to the LTE domain sent by the mobile switching center MSC, where the instruction to delay returning to the LTE domain is used to instruct the mobile terminal to continue to reside in the CS domain after completing the first CS service; Continue to reside in the CS domain according to the instruction to delay returning to the LTE domain, and perform a second CS service in the CS domain; The mobile terminal returns to the LTE domain. 2. The method according to claim 1, wherein the instruction of returning to the LTE domain after a delay is obtained by the MSC from the subscription data of the user corresponding to the mobile terminal to obtain the start time of the second CS service and the first The difference between the CS service end times is sent when the time difference is smaller than a predetermined time threshold. 3. The method according to claim 1, characterized in that the MSC obtains the second CS service corresponding to the service type of the first CS service according to the service type of the first CS service in the instruction of delaying the return to the LTE domain. The start time of the CS service is obtained by obtaining the difference between the start time of the second CS service and the end time of the first CS service, and sending when the time difference is smaller than a predetermined time threshold. 4. The method according to claim 2 or 3, wherein the time threshold is less than the sum of the time it takes for the mobile terminal to return to the LTE domain from the CS domain and fall back from the LTE domain to the CS domain. 5. The method according to claim 1, wherein the mobile terminal further comprises: after performing the second CS service and before returning to the LTE domain: Receive the instruction from the MSC to return to the LTE domain after a delay, and stay in the CS domain to perform the third CS service. 6. A mobile terminal, characterized in that, comprising: A receiving unit, configured to receive a circuit domain fallback CSFB instruction sent by a mobility management entity MME; A circuit domain fallback unit, configured to fall back from the Long Term Evolution LTE domain to the Circuit Switched CS domain according to the CSFB indication received by the receiving unit; a CS service executing unit, configured to perform a first CS service in the CS domain after the mobile terminal falls back to the CS domain; The receiving unit is further configured to receive an instruction to delay returning to the LTE domain sent by the mobile switching center MSC, and the instruction to delay returning to the LTE domain is used to instruct the mobile terminal to continue to reside after completing the first CS service. in the CS domain; The CS service execution unit is further configured to continue to reside in the CS domain and perform a second CS service in the CS domain according to the instruction received by the receiving unit to delay returning to the LTE domain; The return unit is used to return the LTE domain. 7. The mobile terminal according to claim 6, characterized in that, the instruction received by the receiving unit delays returning to the LTE domain, and the MSC learns from the subscription data that the start time of the second CS service is different from that of the first CS service Sent when the difference in end time is less than a predetermined time threshold. 8. The mobile terminal according to claim 6, characterized in that, the delayed return to the LTE domain instruction received by the receiving unit is determined by the MSC according to the service type of the first CS service and the first CS service configured by the MSC. The mapping relationship between the service type and the start time of the second CS service is sent after the difference between the start time of the second CS service and the end time of the first CS service is less than a predetermined time threshold. 9. The mobile terminal according to claim 7 or 8, wherein the time threshold is less than the sum of the time it takes for the mobile terminal to directly return to the LTE domain and fall back from the LTE domain to the CS domain after completing the first CS service. 10. A mobile switching center, characterized in that, comprising: The first circuit-switched CS service processing unit is configured to interact with the mobile terminal to perform the first CS service after the mobile terminal falls back from the Long Term Evolution LTE domain to the CS domain; A sending unit, configured to send an instruction to delay returning to the LTE domain to the mobile terminal, where the instruction to delay returning to the LTE domain is used to instruct the mobile terminal to continue to reside in the CS domain after completing the first CS service ; The second CS service unit is configured to interact with the mobile terminal that continues to reside in the CS domain to perform a second CS service after the mobile terminal receives the instruction to delay returning to the LTE domain. 11. The mobile switching center according to claim 10, characterized in that, the mobile switching center further comprises: An obtaining unit, configured to obtain the difference between the start time of the second CS service and the end time of the first CS service from the subscription data of the user corresponding to the mobile terminal, and notify when the time difference is less than a predetermined time threshold The sending unit sends the instruction to delay returning to the LTE domain. 12. The mobile switching center according to claim 10, characterized in that, the mobile switching center further comprises: The obtaining unit is configured to obtain the start time of the second CS service corresponding to the service type of the first CS service according to the service type of the first CS service, and obtain the start time of the second CS service and the first CS service start time. The difference between service end times, when the time difference is less than a predetermined time threshold, notify the sending unit to send the delayed return to LTE domain instruction.