CN110876169A - Method and device for saving call after circuit switched fallback abnormity - Google Patents

Abstract

Embodiments of the present invention provide a method and device for saving a call after an abnormal circuit domain fallback. The method includes: after initiating the CS domain fallback voice service request, judging whether a fallback instruction sent by the network side is received before the first timing time-out time-out; Indicates that the terminal autonomously falls back to the CS domain network; initiates a call or completes a paging response in the CS domain. In the embodiment of the present invention, a timer is added on the terminal side to determine whether an abnormality occurs in the circuit domain fallback process. If an abnormality occurs, the terminal automatically completes the circuit domain fallback, so as to remedy the failure of the fallback caused by the CSFB abnormality and ensure the continuity of the call service.

Description

Method and device for saving call after abnormal circuit domain fallback

technical field

Embodiments of the present invention relate to the field of communication technologies, and in particular, to a method and apparatus for saving a call after an abnormal circuit domain fallback.

Background technique

Circuit Switched Fallback (CSFB) is an LTE network voice call service bearer solution. In this solution, when a user performs a calling voice service, the EPS (Evolved Packet System, Evolved Packet System) network instructs the user to fall back to the target GSM/UMTS Circuit Switched (CS) network before initiating a voice call. After the called voice service receives a voice indication message (receives CS-Paging from the network side in idle state, and receives CS Service Notification from the network side in service state), it is indicated by the EPS network. The user falls back to the target GSM/UMTS circuit domain network, and then initiates a voice called response connection.

Under normal circumstances, the network side delivers the GSM frequency by sending redirection signaling, instructing the terminal to complete the fallback and complete subsequent services. However, under abnormal circumstances, the network side may not send redirection signaling (for example, some manufacturers have set the redirection switch, so that after the redirection switch is turned off in the LTE independent networking process, the network side does not send redirection signaling in the CSFB process). , or the network side sends redirection signaling, and the terminal cannot receive it due to some specific environments (such as a steep drop and weak coverage scenario). If the above abnormal phenomenon occurs, the terminal will stay on the LTE network all the time (the caller does not fall back to the GSM network to complete the call, and the called person does not fall back to the GSM network to complete the paging response), which eventually leads to a call failure.

SUMMARY OF THE INVENTION

In view of the problems in the prior art, the embodiments of the present invention provide a method and apparatus for saving a call after an abnormal circuit domain fallback.

In one aspect, an embodiment of the present invention provides a method for saving a call after an abnormal circuit domain fallback, the method comprising:

After initiating the CS domain fallback voice service request, determine whether a fallback instruction sent by the network side is received before the first timing time-out expires;

If the fallback instruction from the network side is not received before the first timing period expires, the terminal autonomously falls back to the circuit area network;

Initiate a call or complete a paging response in the circuit domain.

On the other hand, an embodiment of the present invention provides a device for saving a call after an abnormal circuit domain fallback, the device comprising:

a judging unit, configured to judge whether a fallback instruction sent by the network side is received before the first timing time-out time-out after initiating the CS domain fallback voice service request;

a fallback unit, configured to automatically fall back to the circuit area network if the terminal does not receive a fallback instruction from the network side before the first timing time-out expires;

The calling unit is used to initiate a call or complete a paging response in the circuit domain.

On the other hand, an embodiment of the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and running on the processor, where the processor implements the above circuit domain when executing the program Steps for a method to rescue a call after falling back on an exception.

On the other hand, an embodiment of the present invention further provides a non-transitory computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, implements the steps of the above-mentioned method for saving a call after a circuit domain fallback exception .

In the embodiment of the present invention, a timer is added on the terminal side to determine whether an abnormality occurs in the circuit domain fallback process. If an abnormality occurs, the terminal automatically completes the circuit domain fallback, so as to remedy the failure of the fallback caused by the CSFB abnormality and ensure the continuity of the call service.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces 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 These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic flowchart of a method for saving a call after an abnormal circuit domain fallback provided by an embodiment of the present invention;

2 is a schematic flowchart of a method for a CSFB-based voice call provided by an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an apparatus for saving a call after an abnormal circuit domain fallback provided by an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

FIG. 1 shows a schematic flowchart of a method for saving a call after an abnormal circuit domain fallback provided by an embodiment of the present invention.

As shown in FIG. 1 , the method for saving a call after an abnormal circuit domain fallback provided by an embodiment of the present invention specifically includes the following steps:

S11, after initiating the CS domain fallback voice service request, determine whether a fallback instruction sent by the network side is received before the first timing time-out expires;

In this embodiment of the present invention, a CSFB abnormal process waiting timer is added on the terminal side to determine whether the CSFB process is abnormal. After initiating a CSFB fallback request, if a fallback instruction from the network side is received before the timer times out, the CSFB fallback is normal. Otherwise, an exception occurs when the circuit domain falls back.

S12. If the fallback instruction from the network side is not received before the first timing period expires, the terminal autonomously falls back to the circuit area network;

The embodiments of the present invention remedy the phenomenon of unsuccessful fallback caused by abnormal fallback in the circuit domain. After judging the abnormality, the terminal automatically completes the fallback to the GSM network according to the previous fallback frequency point, thereby saving the voice call.

S13. Initiate a call in the circuit domain or complete a paging response.

In the embodiment of the present invention, after successfully camping on the GSM, the calling party initiates a call on the GSM network, and the called party completes the paging response on the GSM network, so that the call service is continued.

In the embodiment of the present invention, a timer is added on the terminal side to determine whether the circuit domain fallback process is abnormal. If an abnormality occurs, the terminal automatically completes the circuit domain fallback, so as to remedy the failure of the fallback caused by the CSFB abnormality, and the terminal side completes the fallback independently. The call connection process can improve network indicators and improve user-side perception.

In the embodiment of the present invention, only the terminal side needs to be upgraded and improved, and the signaling process is completely self-judging behavior of the terminal, which does not involve the transformation of the network side, and is simple and convenient to implement.

Specifically, the first timing duration T=T ₁ +T ₂ , where:

T1 is the average value of the previous N fallback durations _of the terminal, and the fallback duration is the time difference from when the terminal initiates a fallback request to when the terminal receives _a fallback indication; if the terminal does not fall back N times in the early stage, T1 is the specified second timing duration;

T ₂ is the specified third timing duration.

The CSFB abnormal process waiting timer provided by the embodiment of the present invention is composed of an average value T ₁ of a previous fallback duration and an abnormal waiting timer T ₂ , and is a dynamic variable timer.

Specifically, the average value of the time difference between the terminal sending the CSFB request message (Extended service request) the first N times (for example, the first 5 times) and receiving the fallback indication (RRC connection release) from the network side is T ₁ ; N times (for example, only falling back 4 times, but not reaching 5 times), then T ₁ is set to a specified duration, for example, T ₁ is set to 0.5 seconds.

T ₂ is an abnormal waiting timer with a specified duration, and T ₂ can be set to 5 seconds.

On the basis of the above embodiment, S11 specifically includes:

Obtain the service type carried in the extended service message sent by the terminal to the network side;

Determine whether the service type is a CS fallback service;

When the service type is a CS fallback service, start a timer whose timing duration is the first timing duration;

Determine whether the redirection signaling sent by the network side is received before the timer expires.

Specifically, the CSFB signaling process includes:

When a terminal initiates a CSFB-based voice service, it will send an ESR (Extended ServiceRequest, extended service message) to the network side. The message carries a Service type (service type) cell, indicating that the service type is the originating CSFB voice service, and then it will be sent to the base station. With the help of , it fell back to 2G.

The base station sends a redirection signaling RRC connection release (RRC connection release) message, and the GSM frequency point is specified in the message to fall back, and then the process of initiating a call or responding to a paging in GSM is performed.

When the terminal side initiates the Extended service request in this embodiment of the present invention, the following judgments are made:

Service type judges whether it is mobile originating CS fallback or 1xCSfallback. If so, it can be judged that it is a service triggered by CSFB (the calling side is actively triggered, and the called side is triggered by the network side prompting the called side to respond actively). Once it is judged that it is a CSFB service, the terminal side starts the CSFB exception process waiting timer, receives the RRC connection release message from the network side before the CSFB exception process wait timer expires, and normally performs the fallback process according to the network side guidance. Once the CSFB abnormal process waits for a timeout, the terminal automatically redirects to the GSM network.

On the basis of the above embodiment, S12 specifically includes:

Search for the historical frequency points that the terminal has camped on, and perform cell camping according to the signal strength of each frequency point;

If the historical frequency point cannot complete the camping, scan the full frequency band of the frequency band that the terminal can support and complete the cell camping.

Specifically, the process of autonomous redirection of the terminal is as follows: searching for historical frequency points (GSM frequency points that the terminal has previously camped on), selecting the strongest frequency point to complete the camping, and if unable to camp, then sweeping the entire frequency band supported by the terminal And stay at the scanned frequency point, and the service continues. After successfully camping on the GSM, the calling party initiates a call on the GSM network, the called party completes the paging response on the GSM network, and the call service continues.

FIG. 2 shows a schematic flowchart of a CSFB-based voice call according to an embodiment of the present invention.

2, the CSFB-based voice call proposed by the embodiment of the present invention specifically includes the following steps:

The terminal sends an ESR message;

Determine whether the service type carried in the ESR message is CSFB;

If the service type is CSFB, the terminal side starts the CSFB exception process waiting timer T;

After starting the timer T, determine whether the CSFB abnormal flow waits for the redirection signaling from the network side before the timer T times out;

If the redirection signaling is received before T times out, the CSFB process is normally completed according to the instructions of the network side, otherwise the terminal selects a historical frequency point to complete the GSM cell camping;

If the camping is unsuccessful, scan the frequency band supported by the terminal to complete the GSM cell camping;

After the park is successful, the calling party initiates a voice call on the GSM, and the called party completes the paging response on the GSM.

It should be noted that the above CSFB process is applicable to both the calling terminal and the called terminal. Regardless of the calling voice service or the called voice service, when a call is made (calling) or a voice indication message is received (the callee is in idle state, the When the called service state receives the CS service notification (CS ServiceNotification) sent by the network side, it initiates sending an ESR message to the network side, and then judges the CSFB abnormality. .

The embodiment of the present invention also provides a device for saving a call after the circuit domain fallback is abnormal.

FIG. 3 shows a schematic structural diagram of an apparatus for saving a call after an abnormal circuit domain fallback provided by an embodiment of the present invention.

As shown in FIG. 3 , the apparatus for saving a call after an abnormal circuit domain fallback provided by an embodiment of the present invention includes a judgment unit 11, a fallback unit 12, and a call unit 13, wherein:

The judging unit 11 is configured to, after initiating the CS domain fallback voice service request, judge whether a fallback instruction sent by the network side is received before the first timing time-out expires;

In this embodiment of the present invention, a CSFB abnormal process waiting timer is added on the terminal side to determine whether the CSFB process is abnormal. After initiating a CSFB fallback request, if a fallback instruction from the network side is received before the timer times out, the CSFB fallback is normal. Otherwise, an exception occurs when the circuit domain falls back.

The fallback unit 12 is configured to automatically fall back to the circuit area network if the terminal does not receive a fallback instruction from the network side before the first timing time-out expires;

The embodiments of the present invention remedy the phenomenon of unsuccessful fallback caused by abnormal fallback in the circuit domain. After judging the abnormality, the terminal automatically completes the fallback to the GSM network according to the previous fallback frequency point, thereby saving the voice call.

The talking unit 13 is used for initiating a call or completing a paging response in the circuit domain.

In the embodiment of the present invention, after successfully camping on the GSM, the calling party initiates a call on the GSM network, and the called party completes the paging response on the GSM network, so that the call service is continuous.

In the embodiment of the present invention, a timer is added on the terminal side to determine whether the circuit domain fallback process is abnormal. If an abnormality occurs, the terminal automatically completes the circuit domain fallback, so as to remedy the failure of the fallback caused by the CSFB abnormality, and the terminal side completes the fallback independently. The call connection process can improve network indicators and improve user-side perception.

In the embodiment of the present invention, only the terminal side needs to be upgraded and improved, and the signaling process is completely self-judging behavior of the terminal, which does not involve the transformation of the network side, and is simple and convenient to implement.

Specifically, the first timing duration T=T ₁ +T ₂ , where:

T1 is the average value of the previous N fallback durations _of the terminal, and the fallback duration is the time difference from when the terminal initiates a fallback request to when the terminal receives _a fallback indication; if the terminal does not fall back N times in the early stage, T1 is the specified second timing duration;

T ₂ is the specified third timing duration.

The CSFB abnormal process waiting timer provided by the embodiment of the present invention is composed of an average value T ₁ of a previous fallback duration and an abnormal waiting timer T ₂ , and is a dynamic variable timer.

Specifically, the average value of the time difference between the terminal sending the CSFB request message (Extended service request) the first N times (for example, the first 5 times) and receiving the fallback indication (RRC connection release) from the network side is T ₁ ; N times (for example, only falling back 4 times, but not reaching 5 times), then T ₁ is set to a specified duration, for example, T ₁ is set to 0.5 seconds.

T ₂ is an abnormal waiting timer with a specified duration, and T ₂ can be set to 5 seconds.

On the basis of the above embodiment, the judging unit includes:

an obtaining module, configured to obtain the service type carried in the extended service message sent by the terminal to the network side;

a first judging module, configured to judge whether the service type is a circuit domain fallback service;

an enabling module, configured to enable a timer whose timing duration is a first timing duration when the service type is a CS fallback service;

The second judgment module is used for judging whether the redirection signaling sent by the network side is received before the timer expires.

When the terminal side initiates the Extended service request in this embodiment of the present invention, the following judgments are made:

Service type judges whether it is mobile originating CS fallback or 1xCSfallback. If so, it can be judged that it is a service triggered by CSFB (the calling side is actively triggered, and the called side is triggered by the network side prompting the called side to respond actively). Once it is judged that it is a CSFB service, the terminal side starts the CSFB exception process waiting timer, receives the RRC connection release message from the network side before the CSFB exception process wait timer expires, and normally performs the fallback process according to the network side guidance. Once the CSFB abnormal process waits for a timeout, the terminal automatically redirects to the GSM network.

Specifically, the fallback unit 12 includes:

The first camping module is used to search the historical frequency points where the terminal has camped, and perform cell camping according to the signal strength of each frequency point;

The second camping module is used to perform a full-band frequency scan on the frequency band that the terminal can support and complete the cell camping if the historical frequency point cannot complete the camping.

Specifically, the process of autonomous redirection of the terminal is as follows: searching for historical frequency points (GSM frequency points that the terminal has previously camped on), selecting the strongest frequency point to complete the camping, and if unable to camp, then sweeping the entire frequency band supported by the terminal And stay at the scanned frequency point, and the service continues. After successfully camping on the GSM, the calling party initiates a call on the GSM network, the called party completes the paging response on the GSM network, and the call service continues.

The functional modules in the embodiments of the present invention may implement relevant functional modules by using a hardware processor, which will not be repeated in the embodiments of the present invention.

The device embodiments described above are only illustrative, wherein 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 it can be distributed over multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.

An embodiment of the present invention further provides an electronic device, including a memory, a processor, and a computer program stored in the memory and running on the processor, where the processor implements the method as shown in FIG. 1 when the processor executes the program.

FIG. 4 shows a schematic structural diagram of an electronic device provided by an embodiment of the present invention.

As shown in FIG. 4 , the electronic device provided by the embodiment of the present invention includes a memory 21 , a processor 22 , a bus 23 , and a computer program stored in the memory 21 and running on the processor 22 . The memory 21 and the processor 22 communicate with each other through the bus 23 .

The processor 22 is configured to call program instructions in the memory 21 to implement the method as shown in FIG. 1 when executing the program.

For example, the processor implements the following methods when executing the program:

After initiating the CS domain fallback voice service request, determine whether a fallback instruction sent by the network side is received before the first timing time-out expires;

If the fallback instruction from the network side is not received before the first timing period expires, the terminal autonomously falls back to the circuit area network;

Initiate a call or complete a paging response in the circuit domain.

In the electronic device provided by the embodiment of the present invention, a timer is added on the terminal side to determine whether the circuit domain fallback process is abnormal. If an abnormality occurs, the terminal automatically completes the circuit domain fallback, so as to remedy the failure of the fallback caused by the CSFB abnormality and ensure the call Business continues.

An embodiment of the present invention further provides a non-transitory computer-readable storage medium, where a computer program is stored on the storage medium, and when the program is executed by a processor, the steps as shown in FIG. 1 are implemented.

For example, the processor implements the following methods when executing the program:

After initiating the CS domain fallback voice service request, determine whether a fallback instruction sent by the network side is received before the first timing time-out expires;

If the fallback instruction from the network side is not received before the first timing period expires, the terminal autonomously falls back to the circuit area network;

Initiate a call or complete a paging response in the circuit domain.

In the non-transitory computer-readable storage medium provided by the embodiment of the present invention, a timer is added on the terminal side to determine whether the circuit domain fallback process is abnormal. If an abnormality occurs, the terminal automatically completes the circuit domain fallback, so that the fallback fails for CSFB abnormality. The phenomenon is remedied to ensure the continuity of the call service.

An embodiment of the present invention discloses a computer program product, the computer program product includes a computer program stored on a non-transitory computer-readable storage medium, the computer program includes program instructions, when the program instructions are executed by a computer , the computer can execute the methods provided by the above method embodiments, for example, including:

After initiating the CS domain fallback voice service request, determine whether a fallback instruction sent by the network side is received before the first timing time-out expires;

If the fallback instruction from the network side is not received before the first timing period expires, the terminal autonomously falls back to the circuit area network;

Initiate a call or complete a paging response in the circuit domain.

It will be understood by those skilled in the art that although some of the embodiments described herein include certain features, but not others, included in other embodiments, that combinations of features of the different embodiments are intended to be within the scope of the present invention And form different embodiments.

From the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and certainly can also be implemented by hardware. Based on this understanding, the above-mentioned technical solutions can be embodied in the form of software products in essence or the parts that make contributions to the prior art, and the computer software products can be stored in computer-readable storage media, such as ROM/RAM, magnetic A disc, an optical disc, etc., includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in various embodiments or some parts of the embodiments.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A method for saving a call after a circuit domain fallback is abnormal, wherein the method comprises: After initiating the CS domain fallback voice service request, determine whether a fallback instruction sent by the network side is received before the first timing time-out expires; If the fallback instruction from the network side is not received before the first timing period expires, the terminal autonomously falls back to the circuit area network; Initiate a call or complete a paging response in the circuit domain. 2. The method according to claim 1, wherein The first timing duration T=T ₁ +T ₂ , where: T1 is the average value of the previous N fallback durations _of the terminal, and the fallback duration is the time difference from when the terminal initiates a fallback request to when the terminal receives _a fallback indication; if the terminal does not fall back N times in the early stage, T1 is the specified second timing duration; T ₂ is the specified third timing duration. 3. The method according to claim 1, wherein after initiating the CS domain fallback voice service request, judging whether a fallback instruction sent by the network side is received before the first timing time-out expires comprises: Obtain the service type carried in the extended service message sent by the terminal to the network side; Determine whether the service type is a CS fallback service; When the service type is a CS fallback service, start a timer whose timing duration is the first timing duration; Determine whether the redirection signaling sent by the network side is received before the timer expires. 4. The method according to claim 1, wherein the terminal autonomously falling back to the circuit area network comprises: Search for the historical frequency points that the terminal has camped on, and perform cell camping according to the signal strength of each frequency point; If the historical frequency point cannot complete the camping, scan the full frequency band of the frequency band that the terminal can support and complete the cell camping. 5. A device for saving a call after a circuit domain fallback is abnormal, wherein the device comprises: a judging unit, configured to judge whether a fallback instruction sent by the network side is received before the first timing time-out time-out after initiating the CS domain fallback voice service request; a fallback unit, configured to automatically fall back to the circuit area network if the terminal does not receive a fallback instruction from the network side before the first timing time-out expires; The calling unit is used to initiate a call or complete a paging response in the circuit domain. 6. The device of claim 5, wherein The first timing duration T=T ₁ +T ₂ , where: T1 is the average value of the previous N fallback durations _of the terminal, and the fallback duration is the time difference from when the terminal initiates a fallback request to when the terminal receives _a fallback indication; if the terminal does not fall back N times in the early stage, T1 is the specified second timing duration; T ₂ is the specified third timing duration. 7. The device according to claim 5, wherein the judging unit comprises: an obtaining module, configured to obtain the service type carried in the extended service message sent by the terminal to the network side; a first judging module, configured to judge whether the service type is a circuit domain fallback service; an enabling module, configured to enable a timer whose timing duration is a first timing duration when the service type is a CS fallback service; The second judgment module is used for judging whether the redirection signaling sent by the network side is received before the timer expires. 8. The device according to claim 5, wherein the fallback unit comprises: The first camping module is used to search the historical frequency points where the terminal has camped, and perform cell camping according to the signal strength of each frequency point; The second camping module is used to perform a full-band frequency scan on the frequency band that the terminal can support and complete the cell camping if the historical frequency point cannot complete the camping. 9. An electronic device, comprising a memory, a processor and a computer program stored on the memory and running on the processor, wherein the processor implements any one of claims 1 to 5 when the processor executes the program The steps of saving the call after the circuit domain fallback is abnormal. 10. A non-transitory computer-readable storage medium on which a computer program is stored, characterized in that, when the computer program is executed by a processor, the rescue after a circuit domain fallback abnormality according to any one of claims 1 to 5 is realized Call steps.

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