CN115942409A

CN115942409A - EPSFB call processing method, device, equipment and storage medium

Info

Publication number: CN115942409A
Application number: CN202110917184.8A
Authority: CN
Inventors: 李夏林; 李蔚; 桂国富; 姚立; 龙祺; 朱达贤; 杜昌明; 王君诚; 何梦靖
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Group Anhui Co Ltd
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Group Anhui Co Ltd
Priority date: 2021-08-11
Filing date: 2021-08-11
Publication date: 2023-04-07

Abstract

The embodiment of the application provides an EPSFB call processing method, a device, equipment and a storage medium, the EPSFB call processing method for the retroversion of the evolution grouping system is applied to a Home Subscriber Server (HSS) or a unified data management server, and the method comprises the following steps: receiving a call request sent by a Service Centralized and Continuous Application Server (SCCAS); responding to the call request, inquiring the registration information of an Authentication Management Function (AMF) and the registration information of an interworking function (IWF) of the user to obtain a first inquiry result; sending routing information of a user Circuit Switching (CS) domain to a Service Concentration and Continuity Application Server (SCCAS) according to a first query result; the routing information of the user circuit switching CS domain is obtained by inquiry; the embodiment of the application can solve the problem that the existing method for reducing the integral time delay of the evolved packet system fallback EPSFB can sacrifice part of the evolved packet system fallback EPSFB calls which can be connected through CS RETRY.

Description

EPSFB call processing method, device, equipment and storage medium

Technical Field

The present application belongs to the field of communications, and in particular, to a method, an apparatus, a device, and a storage medium for processing an EPSFB call.

Background

The 5G voice network consists of a 4G/5G wireless network, a 5G core network 5GC, a 4G core network EPC and an IP multimedia system IMS network, wherein the wireless network provides access of users and radio bearer of voice service, the 5GC and the EPC provide core network bearer and voice service continuity, and the IMS provides session control and service. Currently, the main way to implement 5G user voice service is to fall back to 4G network-connected EVOLVED packet system FALLBACK (epoffed PACKET SYSTEM FALLBACK, EPSFB), which mainly includes 5GC/EPC domain flow and IMS domain flow. The evolved packet system fallback EPSFB call in the IMS domain flow is exactly the same as the ordinary 4G VoLTE call: the called party can not be connected in the IMS domain, and a CS RETRY flow is introduced. However, the 5G user only supports single domain registration, and the registration stage does not initiate the combined location update of the SGS interface of 4G, so that the current CS RETRY flow becomes untimely, and the overall delay of the fallback EPSFB of the evolved packet system is increased.

The reduction of the overall time delay of an evolved packet system fallback EPSFB is realized by inhibiting the CS RETRY of the evolved packet system fallback EPSFB on a SERVICE CENTRALIZATION AND CONTINUITY APPLICATION SERVER (SCCAS) network element in an IMS domain, but the method may sacrifice part of the evolved packet system fallback EPSFB calls that can be connected through the CS RETRY.

Disclosure of Invention

Embodiments of the present application provide a method, an apparatus, a device, and a storage medium for processing an EPSFB call, which can solve a problem that an existing method for reducing an overall time delay of an evolved packet system fallback EPSFB may sacrifice part of an evolved packet system fallback EPSFB call that can be connected through a CS RETRY.

In a first aspect, an embodiment of the present application provides a method for processing an EPSFB call fallback in an evolved packet system, where the method is applied to a home subscriber server HSS or a unified data management server, and the method includes:

receiving a call request sent by a service centralization and continuity application server SCCAS;

responding to the call request, inquiring the registration information of an Authentication Management Function (AMF) and the registration information of an interworking function (IWF) of the user to obtain a first inquiry result;

sending routing information of a user Circuit Switching (CS) domain to a Service Concentration and Continuity Application Server (SCCAS) according to a first query result; the user circuit switching CS domain routing information is obtained by inquiry.

Further, in an embodiment, before sending the user circuit switched, CS, domain routing information to the service concentration and continuity application server, SCCAS, according to the first query result, the method further comprises:

inquiring the registration information of a Serving GPRS Support Node (SGSN) of a user to obtain a second inquiry result;

and when the second query result contains the registration information of the serving general packet radio service support node SGSN, sending the routing information of the user circuit switching CS domain to a service centralization and continuity application server SCCAS.

and when the second query result does not contain the registration information of the Serving GPRS Support Node (SGSN), sending the routing information of the CS domain of the user to a Service Centralization and Continuity Application Server (SCCAS) according to the first query result.

Further, in an embodiment, sending the user circuit switched, CS, domain routing information to the traffic concentration and continuity application server, SCCAS, according to the first query result comprises:

and when the first query result does not contain the registration information of the authentication management function AMF and the registration information of the interworking function IWF, sending the routing information of the user Circuit Switching (CS) domain to a Service Concentration and Continuity Application Server (SCCAS).

Further, in one embodiment, the method further comprises:

and when the first query result contains at least one item of the registration information of the interworking function IWF and the registration information of the authentication management function AMF, sending call failure information to the service concentration and continuity application server SCCAS.

In a second aspect, an embodiment of the present application provides an apparatus for processing an EPSFB call for an evolved packet system fallback, where the apparatus is applied to a home subscriber server HSS or a unified data management server, and the apparatus includes:

the receiving module is used for receiving a call request sent by a service concentration and continuity application server SCCAS;

the query module is used for responding to the call request, and querying the registration information of the authentication management function AMF and the registration information of the interworking function IWF of the user to obtain a first query result;

the sending module is used for sending the routing information of the CS domain of the user to a service centralization and continuity application server SCCAS according to the first query result; the user circuit switching CS domain routing information is obtained by inquiry.

Further, in an embodiment, the query module is further configured to query registration information of a serving gprs support node SGSN of the user before sending the CS domain routing information of the user to the SCCAS according to the first query result, to obtain a second query result;

and the sending module is further used for sending the routing information of the CS domain of the user to the SCCAS when the second query result contains the registration information of the SGSN.

and the sending module is also used for sending the routing information of the user circuit switching CS domain to a service concentration and continuity application server SCCAS according to the first query result when the second query result does not contain the registration information of the serving GPRS support node SGSN.

Further, in an embodiment, the sending module is specifically configured to:

In a third aspect, an embodiment of the present application provides an EPSFB call processing device, including: the processor is used for executing the EPSFB call processing method.

In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, where an implementation program for information transfer is stored on the computer-readable storage medium, and when the implementation program is executed by a processor, the method for processing an EPSFB call is implemented.

The EPSFB call processing method, the device, the equipment and the storage medium of the embodiment of the application analyze and inquire the registration information of the user at the HSS side of the attribution signed user server, and decide whether to inquire and send the routing information of the CS domain of the user to the SCCAS according to the registration condition of the user in each communication function represented by the registration information of the user, and when the registration condition of the user in each communication function meets the preset condition, the routing information of the CS domain of the user is still sent to the SCCAS, so that part of the rollback EPSFB calls of the evolved packet system which can be connected through CS RETRY can still be normally carried out, and the problem that part of the rollback EPSFB calls of the evolved packet system which can be connected through CS RETRY is sacrificed due to the inhibition of the CS RETRY of the SCCSFB calls of the SCCRETRY in the SCCAS network element of the IMS domain service centralization and the continuity application server AS network element in the existing method is avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic flow chart of a CS RETRY provided in an embodiment of the present application;

fig. 2 is a schematic flowchart of an EPSFB call processing method provided in an embodiment of the present application;

fig. 3 is a schematic structural diagram of an EPSFB call processing apparatus according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of an EPSFB call processing device according to an embodiment of the present application.

Detailed Description

Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

The evolved packet system fallback EPSFB call in the IMS domain flow is exactly the same as the ordinary 4G VoLTE call: the called party can not be connected in the IMS domain, and a CS RETRY flow is introduced, and is shown in figure 1.

There are mainly two scenarios for CS RETRY triggering:

scene one: the SCCAS does not receive the 183 message (paging no response), the CS RETRY timer is overtime, the SCCAS triggers the CS RETRY, downloads routing information of a user CIRCUIT SWITCHED (CS) network domain through HSS, sends the routing information to the CS network domain through a media gateway control function MGCF for connection, and shows that the paging no response of the user before the FALLBACK under the evolution packet system FALLBACK (EVOLVED PACKET SYSTEM FALLBACK, EPSFB).

Scene two: the SCCAS receives messages of 500/503/580 and the like of the failure of establishing the special load, triggers the CS RETRY, downloads routing information of a user CS network domain through HSS, sends the routing information to the CS network domain through a media gateway control function MGCF for connection, and shows that the user fails to establish the special load after falling back under the EPSFB.

However, the 5G user only supports single domain registration, and the registration stage does not initiate the combined location update of the SGS interface of 4G, so that the current CS RETRY flow becomes untimely, and the overall delay of the fallback EPSFB of the evolved packet system is increased.

The reduction of the whole time delay of the evolution packet system fallback EPSFB is realized by restraining the CS RETRY of the evolution packet system fallback EPSFB on an IMS domain service centralization and continuity application server SCCAS network element, but the method can sacrifice part of the evolution packet system fallback EPSFB conversation which can be connected through the CS RETRY.

In order to solve the problem of the prior art, embodiments of the present application provide an EPSFB call processing method, apparatus, device, and storage medium. According to the embodiment of the application, the registration information of the inquired user is analyzed on the HSS side, whether the inquiry is carried out and the routing information of the circuit switched CS domain of the user is sent to the SCCAS according to the registration condition of the user in each communication function represented by the registration information of the user, and the routing information of the circuit switched CS domain of the user is still sent to the SCCAS when the registration condition of the user in each communication function meets the preset condition, so that part of the EPSFB call which can be returned by the evolved packet system and can be communicated through the CS RETRY can still be normally carried out, and the problem that part of the EPSFB call which can be returned by the evolved packet system and can be communicated through the RETRY is sacrificed due to the fact that the existing method inhibits the CS RETRY of the EPSFB which can be returned by the evolved packet system and can be communicated through the CS RETRY on the SCCAS network element of the IMS domain service centralization and the continuity application server is solved. First, the EPSFB call processing method provided in the embodiment of the present application will be described below.

Fig. 2 is a flowchart illustrating an EPSFB call processing method according to an embodiment of the present application, where the method is applied to a home subscriber server HSS or a Unified Data Management (UDM) server. As shown in fig. 2, the method may include the steps of:

s210, receiving a call request sent by a service centralization and continuity application server SCCAS.

In the present network, the home subscriber server HSS is connected with the service centralization and continuity application server SCCAS in a communication way, and the home subscriber server HSS can directly receive the call request sent by the service centralization and continuity application server SCCAS.

S220, responding to the call request, inquiring the registration information of the authentication management function AMF and the registration information of the interworking function IWF of the user to obtain a first inquiry result.

The home subscriber server HSS can query registration information of a user, for example: registration information of the authentication management function AMF and registration information of the interworking function IWF. If a user switches on a communication function, corresponding communication function registration information exists.

And S230, sending the routing information of the user circuit switching CS domain to a service centralization and continuity application server SCCAS according to the first query result.

The home subscriber server HSS can query the routing information of the CS domain.

The embodiment of the application analyzes and inquires the registration information of the user at the HSS side, and decides whether to inquire and send the routing information of the circuit switched CS domain of the user to the SCCAS according to the registration condition of the user in each communication function represented by the registration information of the user, and when the registration condition of the user in each communication function meets the preset condition, the routing information of the circuit switched CS domain of the user is still sent to the SCCAS, so that part of the evolved packet system rollback SFB calls which can be connected through the CS RETRY can still be normally carried out, and the problem that part of the evolved packet system rollback EPSFB calls which can be connected through the CS RETRY is sacrificed due to the fact that the existing method inhibits the CS RETRY of the evolved packet system rollback EPSFB in the IMS domain service centralization and continuity application server SCCAS network element is avoided.

In one embodiment, before S230, the method may further include:

inquiring the registration information of a Serving GPRS Support Node (SGSN) of a user to obtain a second inquiry result; and when the second query result contains the registration information of the serving general packet radio service support node SGSN, sending the routing information of the user circuit switching CS domain to a service centralization and continuity application server SCCAS.

When the registration information of the serving GPRS support node SGSN exists, indicating that the user opens the serving GPRS support node function, the routing information of the user circuit switching CS domain is directly sent to a service concentration and continuity application server SCCAS.

The embodiment of the application analyzes and inquires the registration information of the user at the HSS side, decides whether to inquire and sends the routing information of the CS domain of the user to the SCCAS according to the registration condition of the user at the SGSN represented by the registration information of the user, and still sends the routing information of the CS domain of the user to the SCCAS when the registration condition of the user at each communication function meets the preset condition, so that part of the rollback EPSFB call of the evolved packet system which can be connected through CS RETRY can still be normally carried out.

In one embodiment, before S230, the method may further include:

inquiring the registration information of a Serving GPRS Support Node (SGSN) of a user to obtain a second inquiry result; and when the second query result does not contain the registration information of the Serving GPRS Support Node (SGSN), sending the routing information of the CS domain of the user to a Service Centralization and Continuity Application Server (SCCAS) according to the first query result.

When the registration information of the Serving GPRS Support Node (SGSN) does not exist, the user does not open the serving GPRS support node function, and the routing information of the user Circuit Switching (CS) domain is sent to a Service Centralized and Continuity Application Server (SCCAS) according to the first query result.

The embodiment of the application analyzes and inquires the registration information of the user at the side of a Home Subscriber Server (HSS), determines whether to inquire and send the routing information of a Circuit Switched (CS) domain of the user to a Service Centralized and Continuous Application Server (SCCAS) according to the registration condition of the user represented by the registration information of the user at a Serving GPRS Support Node (SGSN), an Authentication Management Function (AMF) and an interworking function (IWF), and still sends the routing information of the CS domain of the user to the SCCAS when the registration condition of the user at each communication function meets a preset condition, so that part of the rollback EPSFB call of an evolved packet system which can be connected through CS RETRY can still be normally carried out.

In one embodiment, S230 may include:

When the registration information of the authentication management function AMF and the registration information of the interworking function IWF do not exist, the user is not in the 5G network at present, and the routing information of the user circuit switching CS domain is sent to the service concentration and continuity application server SCCAS.

The embodiment of the application analyzes and inquires the registration information of the user at the HSS side, decides whether to inquire and sends the routing information of the CS domain of the user to the SCCAS according to the registration condition of the user represented by the registration information of the user at the authentication management function AMF and the interworking function IWF, and still sends the routing information of the CS domain of the user to the SCCAS when the registration condition of the user at each communication function meets the preset condition, so that part of the Evolved Packet System (EPSFB) call which can be connected through CS RETRY can still be normally carried out.

In one embodiment, the method may further comprise:

When at least one item of registration information of the authentication management function AMF and the interworking function IWF exists, the user is still in the 5G network at present, and a CS RETRY flow is not needed, so that call failure information is sent to a service centralization and continuity application server SCCAS.

Fig. 2 illustrates an EPSFB call processing method, and the following describes the apparatus provided in the embodiment of the present application with reference to fig. 3 and fig. 4.

Fig. 3 is a schematic structural diagram of an EPSFB call processing apparatus provided in an embodiment of the present application, where the apparatus is applied to a home subscriber server HSS or a unified data management server HSS, and each module in the apparatus shown in fig. 3 has a function of implementing each step in fig. 2, and can achieve its corresponding technical effect. As shown in fig. 3, the apparatus may include:

a receiving module 310, configured to receive a call request sent by a service convergence and continuity application server SCCAS.

The query module 320 is configured to query, in response to the call request, registration information of an authentication management function AMF of the user and registration information of an interworking function IWF to obtain a first query result.

And the sending module 330 is configured to send the user circuit switched CS domain routing information to the service convergence and continuity application server SCCAS according to the first query result. The user circuit switching CS domain routing information is obtained by inquiry.

The embodiment of the application analyzes and inquires the registration information of the user at the HSS side, decides whether to inquire and sends the routing information of the CS domain of the user to the SCCAS according to the registration condition of the user represented by the registration information of the user at the AMF and the IWF, and still sends the routing information of the CS domain of the user to the SCCAS when the registration condition of the user at each communication function meets the preset condition, so that part of the fallback EPSFB call of the evolved packet system which can be connected through CS RETRY can still be normally carried out.

In an embodiment, the querying module 320 is further configured to query the registration information of the serving general packet radio service support node SGSN of the user to obtain a second query result before sending the circuit-switched CS domain routing information of the user to the service concentration and continuity application server SCCAS according to the first query result.

The sending module 330 is further configured to send the CS domain routing information of the user to the SCCAS, when the second query result includes registration information of the serving gprs support node SGSN.

The sending module 330 is further configured to send, when the second query result does not include the registration information of the serving gprs support node SGSN, the CS domain routing information of the user circuit switched to the service convergence and continuity application server SCCAS according to the first query result.

In an embodiment, the sending module 330 is specifically configured to:

The embodiment of the application analyzes and inquires the registration information of the user at the HSS side, decides whether to inquire and sends the routing information of the CS domain of the user to the SCCAS according to the registration condition of the user at each communication function represented by the registration information of the user, and still sends the routing information of the CS domain of the user to the SCCAS when the registration condition of the user at each communication function meets the preset condition, so that part of the SFB call returned by the evolved packet system which can be communicated through CS RETRY can still be normally carried out, and the problem that part of the SFB call returned by the evolved packet system which can be communicated through CS RETRY is sacrificed due to the inhibition of the CS RETRY of the EPSFB call returned by the evolved packet system in the IMS domain service centralization and on the SCCAS network element in the continuity application server is avoided in the existing method.

Fig. 4 shows a schematic structural diagram of an EPSFB call processing device according to an embodiment of the present application. As shown in fig. 4, the apparatus may include a processor 401 and a memory 402 storing computer program instructions.

Specifically, the processor 401 may include a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement the embodiments of the present Application.

Memory 402 may include mass storage for data or instructions. By way of example, and not limitation, memory 402 may include a Hard Disk Drive (HDD), floppy Disk Drive, flash memory, optical Disk, magneto-optical Disk, tape, or Universal Serial Bus (USB) Drive or a combination of two or more of these. In one example, memory 402 can include removable or non-removable (or fixed) media, or memory 402 is non-volatile solid-state memory. The memory 402 may be internal or external to the integrated gateway disaster recovery device.

In one example, the Memory 402 may be a Read Only Memory (ROM). In one example, the ROM can be mask-programmed ROM, programmable ROM (PROM), erasable PROM (EPROM), electrically Erasable PROM (EEPROM), electrically rewritable ROM (EAROM), or flash memory, or a combination of two or more of these.

The processor 401 reads and executes the computer program instructions stored in the memory 402 to implement the method in the embodiment shown in fig. 2, and achieve the corresponding technical effects achieved by the embodiment shown in fig. 2 executing the method, which are not described herein again for brevity.

In one example, the EPSFB call processing device can also include a communication interface 403 and a bus 410. As shown in fig. 4, the processor 401, the memory 402, and the communication interface 403 are connected via a bus 410 to complete communication therebetween.

The communication interface 403 is mainly used for implementing communication between modules, apparatuses, units and/or devices in this embodiment.

Bus 410 includes hardware, software, or both coupling the components of the online data traffic charging apparatus to one another. By way of example, and not limitation, a Bus may include an Accelerated Graphics Port (AGP) or other Graphics Bus, an Enhanced Industry Standard Architecture (EISA) Bus, a Front-Side Bus (Front Side Bus, FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) Bus, an InfiniBand interconnect, a Low Pin Count (LPC) Bus, a memory Bus, a Micro Channel Architecture (MCA) Bus, a Peripheral Component Interconnect (PCI) Bus, a PCI-Express (PCI-X) Bus, a Serial Advanced Technology Attachment (SATA) Bus, a video electronics standards Association local (VLB) Bus, or other suitable Bus or a combination of two or more of these. Bus 410 may include one or more buses, where appropriate. Although specific buses are described and shown in the embodiments of the application, any suitable buses or interconnects are contemplated by the application.

The EPSFB call processing device can execute the EPSFB call processing method in the embodiment of the application, thereby realizing the corresponding technical effects of the EPSFB call processing method described in fig. 2.

In addition, in combination with the EPSFB call processing method in the above embodiments, the embodiments of the present application may provide a computer storage medium to implement. The computer storage medium having computer program instructions stored thereon; the computer program instructions, when executed by a processor, implement any one of the EPSFB call processing methods in the above embodiments.

It is to be understood that the present application is not limited to the particular arrangements and instrumentality described above and shown in the attached drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present application are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications, and additions or change the order between the steps after comprehending the spirit of the present application.

The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic Circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the present application are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.

It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.

Aspects of the present application are described above with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions/acts specified in the flowchart and/or block diagram block or blocks. Such a processor may be, but is not limited to, a general purpose processor, a special purpose processor, an application specific processor, or a field programmable logic circuit. It will also be understood that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based computer instructions which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

As described above, only the specific embodiments of the present application are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present application, and these modifications or substitutions should be covered within the scope of the present application.

Claims

1. An EPSFB call processing method is characterized in that the method is applied to a Home Subscriber Server (HSS) or a unified data management server, and the method comprises the following steps:

receiving a call request sent by a Service Centralized and Continuous Application Server (SCCAS);

sending user Circuit Switching (CS) domain routing information to the Service Centralization and Continuity Application Server (SCCAS) according to the first query result; and the routing information of the user circuit switching CS domain is obtained by inquiry.

2. The EPSFB call processing method of claim 1, wherein prior to sending user circuit switched, CS, domain routing information to the traffic concentration and continuity application server, SCCAS, in accordance with the first query result, the method further comprises:

3. The EPSFB call processing method of claim 1, wherein prior to sending user circuit switched, CS, domain routing information to the traffic concentration and continuity application server, SCCAS, according to the first query result, the method further comprises:

and when the second query result does not contain the registration information of the Serving GPRS Support Node (SGSN), sending routing information of a user Circuit Switched (CS) domain to the Service Centralization and Continuity Application Server (SCCAS) according to the first query result.

4. The EPSFB call processing method of claim 1, wherein the sending of user circuit switched, CS, domain routing information to the service concentration and continuity application server, SCCAS, according to the first query result comprises:

and when the first query result does not contain the registration information of the authentication management function AMF and the registration information of the interworking function IWF, sending the routing information of the user circuit switching CS domain to the service concentration and continuity application server SCCAS.

5. The EPSFB call processing method of claim 1, wherein the method further comprises:

6. An Evolved Packet System Fallback (EPSFB) call processing device, which is applied to a Home Subscriber Server (HSS) or a unified data management server, the device comprising:

the query module is used for responding to the call request, querying the registration information of the authentication management function AMF and the registration information of the interworking function IWF of the user to obtain a first query result;

a sending module, configured to send, to the service centralization and continuity application server SCCAS, user circuit switched CS domain routing information according to the first query result; and the routing information of the user circuit switching CS domain is obtained by inquiring.

7. The EPSFB call processing device of claim 6, wherein the query module is further configured to query registration information of a serving gprs support node, SGSN, of a user to obtain a second query result before sending user circuit switched, CS, domain routing information to the SCCAS according to the first query result;

the sending module is further configured to send the routing information of the CS domain to the SCCAS, when the second query result includes registration information of the SGSN, the CS domain routing information.

8. The EPSFB call processing device of claim 6, wherein the query module is further configured to query registration information of a serving gprs support node, SGSN, of a user to obtain a second query result before sending user circuit switched, CS, domain routing information to the SCCAS according to the first query result;

and the sending module is further configured to send, according to the first query result, user circuit switched CS domain routing information to the service centralization and continuity application server SCCAS when the second query result does not include the registration information of the serving gprs support node SGSN.

9. The EPSFB call processing device of claim 6, wherein the sending module is specifically configured to:

and when the first query result does not contain the registration information of the authentication management function AMF and the registration information of the interworking function IWF, sending the routing information of the user Circuit Switching (CS) domain to the Service Centralization and Continuity Application Server (SCCAS).

10. The EPSFB call processing device of claim 6, wherein the sending module is specifically configured to:

11. An EPSFB call processing device, comprising: memory, processor and computer program stored on the memory and executable on the processor, which when executed by the processor implements the EPSFB call processing method of any of claims 1 to 5.

12. A computer-readable storage medium, on which an information transfer implementation program is stored, which, when executed by a processor, implements the EPSFB call processing method of any of claims 1 to 5.