CN111787641A - Method, system, computer device and storage medium for CSFB call establishment - Google Patents
Method, system, computer device and storage medium for CSFB call establishment Download PDFInfo
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- CN111787641A CN111787641A CN202010614848.9A CN202010614848A CN111787641A CN 111787641 A CN111787641 A CN 111787641A CN 202010614848 A CN202010614848 A CN 202010614848A CN 111787641 A CN111787641 A CN 111787641A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W76/00—Connection management
- H04W76/10—Connection setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W76/10—Connection setup
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Abstract
The present disclosure provides a method, a system, a computer device and a storage medium for CSFB call setup, where the method is applied to a mobile terminal and includes: after the multi-mode card joint attachment of the mobile terminal is completed, storing location area identification LAI information when the multi-mode card joint attachment is performed, wherein the LAI information identifies a cell in a circuit switching domain CS network; receiving inter-system cell information sent by a base station; after receiving a paging request sent by a Mobility Management Entity (MME), judging whether LAI information in the multi-mode card joint attachment exists in the inter-system cell information; and if so, establishing a call based on the LAI information when the multi-mode card is jointly attached. The technical scheme of the invention can shorten the CSFB call establishment time and reduce the signaling overhead.
Description
Technical Field
The present disclosure belongs to the field of communications technologies, and in particular, to a method for setting up a CSFB call, a system for setting up a CSFB call, a computer device, and a computer-readable storage medium.
Background
A typical CSFB (Circuit Switched Fallback) service flow mainly includes joint attachment, location update, a calling CSFB flow, a called CSFB flow, and detach, etc.; the basic idea of the CSFB scheme is that the terminal resides in an LTE (Long Term Evolution ) network idle state or a data service connection state, when there is a voice service demand (a calling party or a called party), the terminal falls back to the 2/3G network to establish a voice service with the assistance of the LTE network, and then returns to the LTE network quickly after the call is completed.
The attach procedure of the user with the CSFB function is implemented based on a joint GPRS (General packet radio service)/IMSI (International Mobile Subscriber Identity) attach procedure. The multimode group terminal carries an indication of supporting the CSFB capability in an attach request message sent to an MME (Mobility Management Entity). After receiving a joint attach request of a user, the MME derives VLR (Visited Location Register) information of a CS (Circuit Switched) domain related to the MME while performing EPS (Evolved Packet System) attachment, and initiates a Location update request to the VLR, and after receiving the Location update request, the VLR marks the user as having performed EPS attachment and stores an IP address of the MME of the user, so that an sgservice (Serving General Packet Radio Service) association between the VLR of the user and the MME is created in the VLR. Then, the MSC (Mobile Switching Center) Server/VLR will perform CS domain Location update and transmit the TMSI and LAI (Location Area identity) of the user to the MME, thereby establishing an SGs association in the MME. Finally, the MME includes the TMSI, LAI, and other information allocated to the User by the VLR in an attach request accept message and sends the attach request accept message to the UE (User Equipment), which indicates that the User has successfully performed a joint attach. After the joint attachment is successful, the user with the CSFB capability can process the circuit domain service in the LTE network
Currently, in the CSFB call implementation procedure, when there is an incoming call to a mobile terminal, an MSC sends a paging request to an MME, the MME sends a paging request to the mobile terminal, the mobile terminal receives the paging request sent by the MME, the mobile terminal sends an extended service request to the MME, the MME sends a mobile terminal fallback cell indication to an eNB (evolved Node B, which is an evolved Node B used to represent a base station in the standards of 3GPP LTE and LTE-a), the eNB sends configured fallback cell information to the mobile terminal, the mobile terminal performs fallback cell measurement, sends a measurement result to the eNB, the eNB determines a suitable fallback cell and then sends the information to the mobile terminal, the mobile terminal falls back to the suitable cell, if the fallback cell is not consistent with the cell identifier in the joint attachment, the mobile terminal first performs location update, and after the location update is completed, the mobile terminal sends a paging response message to the MSC, and establishing a call. Multiple cell measurements and location updates result in relatively long overall call setup times and poor user perception.
Disclosure of Invention
The present disclosure provides a method, a system, a computer device and a computer readable storage medium for CSFB call setup, which can shorten the CSFB call setup time, reduce signaling overhead, and improve user experience.
In a first aspect, an embodiment of the present disclosure provides a method for establishing a circuit switched fallback CSFB call, which is applied to a mobile terminal, where the method includes:
after the multi-mode card joint attachment of the mobile terminal is completed, storing location area identification LAI information when the multi-mode card joint attachment is performed, wherein the LAI information identifies a cell in a circuit switching domain CS network;
receiving inter-system cell information sent by a base station;
after receiving a paging request sent by a Mobility Management Entity (MME), judging whether LAI information in the multi-mode card joint attachment exists in the inter-system cell information;
and if so, establishing a call based on the LAI information when the multi-mode card is jointly attached.
Further, the establishing a call based on the LAI information during the multi-mode card joint attachment includes:
performing cell measurement according to the LAI information during the joint attachment of the multi-mode card to obtain a measurement result;
judging whether the measurement result meets a residence condition;
if the measurement result meets the residence condition, directly falling back to the cell identified by the LAI information when the multi-mode card is jointly attached; and the number of the first and second groups,
and establishing a call with the mobile switching center MSC after the mobile terminal falls back.
Further, the directly dropping back to the cell identified by the LAI information when the multi-mode card is attached jointly and establishing a call includes:
sending a direct fallback indication to the MME so that the MME sends a paging response to the MSC according to the direct fallback indication and informs the MSC that the mobile terminal can fallback;
and after sending a direct fallback indication to the MME, directly fallback to the cell identified by the LAI information when the multi-mode card is attached jointly, and not updating the position.
Further, the method further comprises:
if the LAI information when the multi-mode card is attached jointly does not exist in the inter-system cell information, sending an extended service request to an MME, so that the MME sends a mobile terminal fallback cell indication to a base station based on the extended service request, and the base station sends the configured fallback cell information to the mobile terminal according to the mobile terminal fallback cell indication;
receiving configured fallback cell information sent by a base station; and the number of the first and second groups,
according to the configured fallback cell information, the information is fallen back to a proper cell according to a conventional fallback flow; and the number of the first and second groups,
and establishing a call with the M SC after the mobile terminal completes the fallback.
In a second aspect, an embodiment of the present disclosure provides a system for establishing a circuit switched fallback CSFB call, including a mobile terminal, where the mobile terminal includes a storage module, a receiving module, a determining module, and a call establishing module;
the storage module is configured to store location area identifier LAI information when the multi-mode cards of the mobile terminal are jointly attached after the multi-mode cards are jointly attached, wherein the LAI information identifies a cell in a circuit switching domain CS network;
the receiving module is configured to receive inter-system cell information sent by a base station; receiving a paging request sent by a mobility management entity MME;
the judging module is configured to judge whether LAI information in the multi-mode card joint attachment exists in the inter-system cell information after the receiving module receives the inter-system cell information sent by the base station and the paging request sent by the MME;
the call establishing module is configured to establish a call based on the LAI information when the multi-mode card is jointly attached after the judging module judges that the LAI information when the multi-mode card is jointly attached exists in the inter-system cell information.
Further, the call establishing module comprises a measuring unit, a cell drop-back unit and a call unit;
the measurement unit is configured to perform cell measurement according to LAI information during the joint attachment of the multi-mode card to obtain a measurement result;
the judging module is also configured to judge whether the measurement result meets a residence condition;
the cell drop-back unit is set to enable the mobile terminal to directly drop back to the cell of the LAI information identifier when the multi-mode card is jointly attached if the judging module judges that the measuring result meets the residence condition;
and the call unit is set to establish a call with the mobile switching center MSC after the mobile terminal falls back.
Further, the mobile terminal further comprises a sending module;
the sending module is set to send a direct fallback indication to the MME so that the MME sends a paging response to the mobile switching center MSC according to the direct fallback indication to inform the MSC that the mobile terminal can fall back;
the cell drop-back unit is also configured to enable the mobile terminal to directly drop back to the cell of the LAI information identifier when the multi-mode card is jointly attached without position updating after the sending module sends a direct drop-back instruction to the MME;
and the call unit is set to send a call establishing request to the MSC after the fallback is finished, and establish a call.
Further, the mobile terminal further comprises a sending module;
the sending module is further configured to send an extended service request to the MME if the judging module judges that there is no LAI information in the inter-system cell information when the multi-mode card is jointly attached, so that the MME sends a mobile terminal fallback cell indication to the base station based on the extended service request; and the base station sends the configured information of the fallback cells to the mobile terminal according to the indication of the fallback cells of the mobile terminal;
the receiving module is also configured to receive configured fallback cell information sent by the base station;
the call establishment module comprises:
a cell drop-back unit configured to drop the mobile terminal to a suitable cell according to a conventional drop-back flow according to the configured drop-back cell information; and the number of the first and second groups,
and the call unit is arranged to establish a call with the MSC after the mobile terminal falls back.
In a third aspect, an embodiment of the present disclosure further provides a computer device, including a memory and a processor, where the memory stores a computer program, and when the processor runs the computer program stored in the memory, the processor executes the method for setting up a circuit switched fallback CSFB call according to any one of the first aspect.
In a fourth aspect, an embodiment of the present disclosure further provides a computer-readable storage medium, including: computer program which, when run on a computer, causes the computer to perform a method of circuit switched fallback CSFB call setup as described in any of the first aspects.
Has the advantages that:
the method, the system, the computer device and the computer readable storage medium for establishing the CSFB call provided by the present disclosure store the LAI information of the location area identifier when the multi-mode card of the mobile terminal is jointly attached after the multi-mode card is jointly attached, wherein the LAI information identifies a cell in a CS network of a circuit switching domain; receiving inter-system cell information sent by a base station; after receiving a paging request sent by a Mobility Management Entity (MME), judging whether LAI information in the multi-mode card joint attachment exists in the inter-system cell information; and if so, establishing a call based on the LAI information when the multi-mode card is jointly attached. According to the technical scheme, the LAI information during joint attachment is stored, and when calling is carried out, if the LAI information exists in the cell system information sent by the base station, the call drop is directly carried out, so that the problems that a terminal needs to carry out measurement on a plurality of cells and carry out position updating during the call drop, the duration is long, and the service fails are solved, the CSFB call establishment time can be shortened, the signaling overhead is reduced, and the user experience is improved.
Drawings
Fig. 1 is a flowchart of a CSFB call setup method according to a first embodiment of the present disclosure;
fig. 2 is an architecture diagram of a CSFB call setup system according to a second embodiment of the present disclosure.
Detailed Description
In order to make the technical solutions of the present disclosure better understood by those skilled in the art, the present disclosure is further described in detail below with reference to the accompanying drawings and examples.
In which the terminology used in the embodiments of the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in the disclosed embodiments and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
At present, a mobile terminal mostly adopts a 4G multimode card, and the 4G multimode card selects a CSFB technique to implement voice call, in a CSFB implementation flow, when the mobile terminal has an incoming call, an eNB sends a configured fallback cell identifier and frequency point information to the mobile terminal according to cell information where the mobile terminal is currently located, the mobile terminal performs inter-system cell measurement, sends a measurement result to the eNB, and the eNB instructs the mobile terminal to fall back to a suitable cell; when the TAI (Tracking area identity) where the mobile terminal is located spans multiple LAIs, the number of fallback cells provided by the eNB is multiple, and the mobile terminal needs to perform measurement on multiple cells, which prolongs call setup time and affects user experience.
The following describes the technical solutions of the present disclosure and how to solve the above technical problems in specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 1 is a flowchart of a method for setting up a circuit switched fallback CSFB call according to an embodiment of the present disclosure, which is applied to a mobile terminal, and as shown in fig. 1, the method includes:
step S101: after the multi-mode card joint attachment of the mobile terminal is completed, storing location area identification LAI information when the multi-mode card joint attachment is performed, wherein the LAI information identifies a cell in a circuit switching domain CS network;
step S102: receiving inter-system cell information sent by a base station;
step S103: after receiving a paging request sent by a Mobility Management Entity (MME), judging whether LAI information in the multi-mode card joint attachment exists in the inter-system cell information;
step S104: and if so, establishing a call based on the LAI information when the multi-mode card is jointly attached.
The mobile terminal of the embodiment of the disclosure has a 4G multimode card, and the 4G multimode card selects a CSFB technology to realize voice call. After the mobile terminal is started, starting a combined attachment process of the 4G multi-mode card; the 4G multi-mode card of the mobile terminal sends an Attach Request message to the MME, wherein the parameter Attach Type indicates that the Attach Request message is a combined EPS/IMSI attachment flow, and the parameter indicates that the mobile terminal has CS Fallback capability; after receiving the message, the MME sends an SGs AP-LOCATION-UPDATE-REQUEST message to the corresponding VLR, wherein the message comprises parameters such as new LAI, IMSI, MME name and LOCATION UPDATE Type of the 4G multi-mode card and the like; the VLR stores MME information and creates SGs associations with 4G multimode cards under MME. The VLR initiates a 4G multi-mode card location updating process of the HLR according to the user information and the location area information; VLR returns confirmation information to MME; and the MME sends an Attach Accept message to the mobile terminal, wherein the Attach Accept message comprises parameters LAI and VLRTMSI, and joint attachment is completed. After the joint attachment is completed, the mobile terminal stores the location area identification LAI information during the joint attachment, the LAI information identifies a cell in a circuit switching domain CS network, and the LAI information comprises the LAI cell identification information and frequency point information. The cell identifier is generally a location area identifier of a CS domain of a location area to which the mobile terminal belongs when jointly attached.
The method comprises the steps that a mobile terminal receives cell system information sent by a base station (eNB) when in standby or use, wherein the cell system information comprises heterogeneous system cell information, and the heterogeneous system refers to a 2G or 3G network system; when the mobile terminal has an incoming call, the calling MSC sends a call request to an attached MSC of the mobile terminal; the called MSC sends a paging request to the MME; the MME sends a paging request to the mobile terminal; and the mobile terminal receives the paging request sent by the MME, and judges whether the different system cell information in the cell system information has LAI information in the process of joint attachment. If the cell is the cell identified by the LAI information, the mobile terminal directly falls back to the cell identified by the LAI information and the 2G/3G network to establish a call.
The embodiment of the disclosure directly performs fallback by storing the LAI information during the joint attachment, if the LAI information exists in the cell system information sent by the eNB during the call, thereby solving the problems that the terminal needs to perform multiple cell measurements and perform location update during the fallback, the duration is long, and the service fails, shortening the CSFB call establishment time, reducing signaling overhead, and improving user experience.
Further, the establishing a call based on the LAI information during the multi-mode card joint attachment includes:
performing cell measurement according to the LAI information during the joint attachment of the multi-mode card to obtain a measurement result;
judging whether the measurement result meets a residence condition;
if the measurement result meets the residence condition, directly falling back to the cell identified by the LAI information when the multi-mode card is jointly attached; and the number of the first and second groups,
and establishing a call with the mobile switching center MSC after the mobile terminal falls back.
The mobile terminal carries out cell measurement according to the frequency point information of the LAI information which is jointly attached, the measurement process is carried out according to the existing standard flow, and if the measurement result meets the residence condition, the measurement result directly falls back to the cell marked by the LAI information when the multi-mode card is jointly attached; and establishing connection with a Mobile Switching Center (MSC) to finish the call with the calling party. If the measurement result is that the cell does not meet the residence condition, the cell is not suitable for falling back, the mobile terminal sends an extended service request to the MME, and the MME sends a cell falling back indication of the mobile terminal to the eNB; and (5) falling back according to a normal flow.
Further, the inter-system cell system information sent by the base station is periodically sent to the cell by the eNB in a broadcast manner.
The eNB sends cell system information to the surrounding in a broadcasting mode, all terminals in an LTE cell where the eNB base station is located can receive the cell system information, and the cell system information comprises inter-system cell information, so that the terminals can know the cells of the current surrounding inter-system.
Further, the directly dropping back to the cell identified by the LAI information when the multi-mode card is attached jointly and establishing a call includes:
sending a direct fallback indication to the MME so that the MME sends a paging response to the MSC according to the direct fallback indication and informs the MSC that the mobile terminal can fallback; and the number of the first and second groups,
and after sending a direct fallback indication to the MME, directly fallback to the cell of the LAI information identifier when the multi-mode card is attached jointly, not updating the position, sending a call establishing request to the MSC after the fallback is finished, and establishing the call.
The mobile terminal directly falls back to the cell identified by the LAI information without measuring a plurality of cells, and the fallen back cell is consistent with the cell identification during joint attachment without updating the position, thereby saving the signaling flow, shortening the CSFB call establishment time and improving the user experience.
Further, the method further comprises:
if the LAI information when the multi-mode card is attached jointly does not exist in the inter-system cell information, sending an extended service request to an MME, so that the MME sends a mobile terminal fallback cell indication to a base station based on the extended service request, and the base station sends the configured fallback cell information to the mobile terminal according to the mobile terminal fallback cell indication;
receiving configured fallback cell information sent by a base station;
according to the configured fallback cell information, the information is fallen back to a proper cell according to a conventional fallback flow; and the number of the first and second groups,
and establishing a call with the MSC after the mobile terminal completes the fallback.
If the information of the inter-system cell does not contain the LAI information during the joint attachment, it indicates that the mobile terminal may leave the service range of the registered MSC during the joint attachment, and when the current serving MSC is different from the jointly attached MSC, the mobile terminal needs to perform a location updating procedure again to complete the subsequent call connection.
The embodiment of the disclosure enables the mobile terminal to directly fall back to the cell consistent with the cell identifier in the joint attachment under the condition that the mobile terminal does not leave the service range of the registered MSC in the joint attachment and the cell identified by the LAI information in the joint attachment, shortens the CSFB call establishment time, reduces the signaling overhead, prevents service failure, and improves the user experience.
Fig. 2 is an architecture diagram of a system for setting up a circuit switched fallback CSFB call according to a second embodiment of the present disclosure, including a mobile terminal 1, where the mobile terminal 1 includes a storage module 11, a receiving module 12, a determining module 13, and a call setting module 14;
the storage module 11 is configured to store the location area identifier LAI information when the multi-mode card of the mobile terminal 1 is jointly attached, after the multi-mode card is jointly attached, where the LAI information identifies a cell in a CS network;
the receiving module 12 is configured to receive inter-system cell information sent by a base station; receiving a paging request sent by a mobility management entity MME;
the judging module 13 is configured to judge whether there is LAI information in the inter-system cell information when the multi-mode card is attached jointly after the receiving module 12 receives inter-system cell information sent by a base station and a paging request sent by an MME;
the call establishing module 14 is configured to establish a call based on the LAI information when the multi-mode card is jointly attached after the judging module 13 judges that the LAI information when the multi-mode card is jointly attached exists in the inter-system cell information.
Further, the call establishing module 14 includes a measuring unit, a cell dropping unit, and a call unit:
the measurement unit is configured to perform cell measurement according to LAI information during the joint attachment of the multi-mode card to obtain a measurement result;
the judging module is also configured to judge whether the measurement result meets a residence condition;
the cell drop-back unit is set to enable the mobile terminal to directly drop back to the cell of the LAI information identifier when the multi-mode card is jointly attached if the judging module judges that the measuring result meets the residence condition;
and the call unit is set to establish a call with the mobile switching center MSC after the mobile terminal falls back.
Further, the mobile terminal 1 further includes a sending module 15;
the sending module 15 is configured to send a direct fallback indication to the MME, so that the MME sends a paging response to the mobile switching center MSC according to the direct fallback indication, and informs the MSC that the mobile terminal will fall back;
the cell drop-back unit is further configured to directly drop back the mobile terminal to the cell identified by the LAI information when the multi-mode card is attached in a combined manner without performing location update after the sending module 15 sends a direct drop-back instruction to the MME.
Further, the mobile terminal 1 further includes a sending module 15;
the sending module 15 is further configured to send an extended service request to the MME if the determining module 13 determines that there is no LAI information in the inter-system cell information when the multi-mode card is jointly attached, so that the MME sends a mobile terminal fallback cell indication to the base station based on the extended service request; and the base station sends the configured information of the fallback cells to the mobile terminal 1 according to the indication of the fallback cells of the mobile terminal;
the receiving module 12 is further configured to receive configured fallback cell information sent by the base station;
the call establishment module 14 includes:
a cell dropping unit configured to drop the mobile terminal 1 to a suitable cell according to a conventional dropping procedure according to the configured dropping cell information; and the number of the first and second groups,
and the call unit is arranged to establish a call with the MSC after the mobile terminal 1 finishes the fallback.
The CSFB call setup system in the embodiment of the present disclosure is used to implement the CSFB call setup method in the first embodiment of the method, so the description is simple, and reference may be specifically made to the related description in the first embodiment of the method, and details are not described here again.
Furthermore, the embodiments of the present disclosure also provide a computer device, which includes a memory and a processor, where the memory stores a computer program, and when the processor runs the computer program stored in the memory, the processor executes the above-mentioned various possible methods.
In addition, the embodiments of the present disclosure also provide a computer-readable storage medium, in which computer-executable instructions are stored, and when at least one processor of the user equipment executes the computer-executable instructions, the user equipment executes the above-mentioned various possible methods.
Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC (Application Specific Integrated Circuit). Additionally, the ASIC may reside in user equipment. Of course, the processor and the storage medium may reside as discrete components in a communication device.
It is to be understood that the above embodiments are merely exemplary embodiments that are employed to illustrate the principles of the present disclosure, and that the present disclosure is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the disclosure, and these are to be considered as the scope of the disclosure.
Claims (10)
1. A method for setting up a Circuit Switched Fallback (CSFB) call is applied to a mobile terminal, and the method comprises the following steps:
after the multi-mode card joint attachment of the mobile terminal is completed, storing location area identification LAI information when the multi-mode card joint attachment is performed, wherein the LAI information identifies a cell in a circuit switching domain CS network;
receiving inter-system cell information sent by a base station;
after receiving a paging request sent by a Mobility Management Entity (MME), judging whether LAI information in the multi-mode card joint attachment exists in the inter-system cell information;
and if so, establishing a call based on the LAI information when the multi-mode card is jointly attached.
2. The method of claim 1, wherein establishing a call based on LAI information when the multi-mode card is attached jointly comprises:
performing cell measurement according to the LAI information during the joint attachment of the multi-mode card to obtain a measurement result;
judging whether the measurement result meets a residence condition;
if the measurement result meets the residence condition, directly falling back to the cell identified by the LAI information when the multi-mode card is jointly attached; and the number of the first and second groups,
and establishing a call with the mobile switching center MSC after the mobile terminal falls back.
3. The method of claim 2, wherein the directly dropping back to the cell identified by the LAI information when the multi-mode card is jointly attached comprises:
sending a direct fallback indication to the MME so that the MME sends a paging response to the MSC according to the direct fallback indication and informs the MSC that the mobile terminal can fallback;
and after sending a direct fallback indication to the MME, directly fallback to the cell identified by the LAI information when the multi-mode card is attached jointly, and not updating the position.
4. The method of claim 1, further comprising:
if the LAI information when the multi-mode card is attached jointly does not exist in the inter-system cell information, sending an extended service request to an MME, so that the MME sends a mobile terminal fallback cell indication to a base station based on the extended service request, and the base station sends the configured fallback cell information to the mobile terminal according to the mobile terminal fallback cell indication;
receiving configured fallback cell information sent by a base station;
according to the configured fallback cell information, the information is fallen back to a proper cell according to a conventional fallback flow; and the number of the first and second groups,
and establishing a call with the MSC after the mobile terminal completes the fallback.
5. A system for establishing a Circuit Switched Fallback (CSFB) call is characterized by comprising a mobile terminal, wherein the mobile terminal comprises a storage module, a receiving module, a judging module and a call establishing module;
the storage module is configured to store location area identifier LAI information when the multi-mode cards of the mobile terminal are jointly attached after the multi-mode cards are jointly attached, wherein the LAI information identifies a cell in a circuit switching domain CS network;
the receiving module is configured to receive inter-system cell information sent by a base station; receiving a paging request sent by a mobility management entity MME;
the judging module is configured to judge whether LAI information in the multi-mode card joint attachment exists in the inter-system cell information after the receiving module receives the inter-system cell information sent by the base station and the paging request sent by the MME;
the call establishing module is configured to establish a call based on the LAI information when the multi-mode card is jointly attached after the judging module judges that the LAI information when the multi-mode card is jointly attached exists in the inter-system cell information.
6. The system of claim 5, wherein the call setup module comprises a measurement unit, a cell fallback unit and a call unit;
the measurement unit is configured to perform cell measurement according to LAI information during the joint attachment of the multi-mode card to obtain a measurement result;
the judging module is also configured to judge whether the measurement result meets a residence condition;
the cell drop-back unit is set to enable the mobile terminal to directly drop back to the cell of the LAI information identifier when the multi-mode card is jointly attached if the judging module judges that the measuring result meets the residence condition;
and the call unit is set to establish a call with the mobile switching center MSC after the mobile terminal falls back.
7. The system according to claim 6, wherein said mobile terminal further comprises a transmitting module;
the sending module is set to send a direct fallback indication to the MME so that the MME sends a paging response to the mobile switching center MSC according to the direct fallback indication to inform the MSC that the mobile terminal can fall back;
the cell drop-back unit is further configured to enable the mobile terminal to directly drop back to the cell identified by the LAI information when the multi-mode card is jointly attached without performing location update after the sending module sends a direct drop-back instruction to the MME.
8. The method of claim 5, wherein the mobile terminal further comprises a transmitting module;
the sending module is further configured to send an extended service request to the MME if the judging module judges that there is no LAI information when the multi-mode card is jointly attached in the inter-system cell information, so that the MME sends a mobile terminal fallback cell indication to the base station based on the extended service request, and the base station sends the configured fallback cell information to the mobile terminal according to the mobile terminal fallback cell indication;
the receiving module is also configured to receive configured fallback cell information sent by the base station;
the call establishment module comprises:
a cell drop-back unit configured to drop the mobile terminal to a suitable cell according to a conventional drop-back flow according to the configured drop-back cell information; and the number of the first and second groups,
and the call unit is arranged to establish a call with the MSC after the mobile terminal falls back.
9. Computer arrangement comprising a memory and a processor, wherein the memory has stored therein a computer program, and wherein the processor, when executing the computer program stored by the memory, performs the method for circuit switched fallback CSFB call setup as claimed in any of claims 1-4.
10. A computer-readable storage medium, comprising: computer program which, when run on a computer, causes the computer to perform the method of circuit switched fallback CSFB call setup according to any of claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010614848.9A CN111787641B (en) | 2020-06-30 | 2020-06-30 | Method, system, computer device and storage medium for CSFB call establishment |
Applications Claiming Priority (1)
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| CN202010614848.9A CN111787641B (en) | 2020-06-30 | 2020-06-30 | Method, system, computer device and storage medium for CSFB call establishment |
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| CN111787641B (en) | 2022-04-29 |
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