CN1773967A - Method for providing service to circuit field user via group field - Google Patents

Abstract

The invention relates to a method for integrating a packet domain network and a circuit domain network, and discloses a method for providing services for circuit domain users through a packet domain, so that fixed network users can directly access IMS and use IMS services to realize fixed network and mobile network integration and business reuse. In the present invention, by expanding the functions of network nodes such as MGCF, S-CSCF, and AS, the IMS not only supports the intercommunication call with the circuit domain of the fixed network, but also provides services for the users of the circuit domain of the fixed network through the IMS; wherein, the MGCF can judge the signal Determine whether the fixed network circuit domain users whose paths pass through the MGCF subscribe to the IMS service, and trigger the IMS session. The S-CSCF processes the session and routing control, and triggers the AS according to the IMS service subscription information. IMS service; in addition, the HSS function is extended to store and manage IMS subscription service data related to fixed network circuit domain users.

Description

Method for providing services to circuit domain users through packet domain

technical field

The invention relates to a method for integrating a packet domain network and a circuit domain network, in particular to a method for providing services to circuit domain users through the packet domain.

Background technique

The rapid development of optical communication technology and broadband Internet Protocol (Internet Protocol, referred to as "IP") technology has enabled the communication backbone network to have a strong application support capability, and bandwidth is no longer the main difficulty for operators to develop services. However, from the perspective of the development of the global telecom market, the voice and data service markets are becoming increasingly saturated, causing operators to face the dilemma of decreasing business growth year by year and increasingly difficult customer development. Therefore, both emerging operators and traditional operators are looking for new market opportunities and business models, so as to create new business growth points and attract more potential users.

Due to the limitations of circuit switching (CS) of the public telephone network, the development of its business diversity is limited. The public telephone network basically cannot meet the needs of users in terms of mobile services, personalized services and multimedia services. . At the same time, the innovation of computer technology and network technology has changed the user's demand for services. Only the public telephone network or the Internet cannot well meet the user's comprehensive needs for voice, data, and images. Operators need a solution based on the next-generation network architecture and providing new-generation multimedia services to create new business growth points.

The existing fixed-line circuit domain users provide them with various services based on the Public Switched Telephone Network ("PSTN") or Integrated Services Digital Network ("ISDN") through digital program-controlled switches and intelligent networks. ”) business and smart business. On the one hand, due to the close combination of call control and service control, the service deployment speed is slow and the cost is high; on the other hand, digital program-controlled switches and intelligent networks can only provide pure circuit domain services, and the user's human-computer interaction mode is single , The service experience is poor, and the enthusiasm of users to use the service is not high, which is not conducive to the promotion of the service.

With the rapid development of personal mobile communication networks, mobile networks are gradually growing, and under the background of IP networks eventually dominating the world, the development trend of fixed-line next-generation networks (Next Generation Networks, referred to as "NGN") must be to integrate with multiple networks , such as the integration of the packet domain and the circuit domain, and the integration of the mobile network and the fixed network. The convergence of the packet domain and the circuit domain is one of the current research hotspots. Among them, the IP-based Multimedia Subsystem (IP based Multimedia Subsystem) proposed by the 3rd Generation Partnership Project (referred to as "3GPP") in the R5/R6 standard Subsystem, referred to as "IMS") is a system specially designed for the next-generation all-IP multimedia mobile network, focusing on using IP networks to carry mobile multimedia services, so that operators and end users can obtain faster and more flexible services from the innovation of multimedia services. applications, thereby increasing revenue and creating profits for operators.

IMS is the target network for the 3G mobile network to realize packet voice and packet data and provide unified multimedia services and applications. Due to the increasingly fierce market competition, the existing circuit switching system will be eliminated and replaced by an IP-based hardware system with openness, good scalability, and lower purchase and maintenance costs. The 3GPP system then began to gradually shift to an all IP-based core network. The 3GPP specification also increasingly highlights the importance of the IP architecture and introduces the concept of IMS. First, it hopes to provide traditional circuit switching services (such as voice services) in the form of IP. All multimedia services provided. The IMS is an extension of the packet switching domain (Packet Switching, "PS" for short) core network, and is intended to be independent of the PS core network. The IP packet domain is used as the bearer channel for its control signaling and media transmission, and the Session Initiation Protocol (SIP) protocol is used as the call control signaling to establish, maintain and terminate voice and multimedia processes, realizing business Management, session control, and bearer access are separated.

Several examples of IMS multimedia traffic are given below: 1. When a certain user is answering a call, he receives another incoming IP video call. Go to a messaging system. He will then receive a notification that there is a video message in his mailbox. 2. When a certain user is answering a call, he receives another incoming IP video call. The user decides to answer the new call, but he hopes that he can switch between the two calls. 3. A user is not answering any calls, and he is modifying his user settings file to forward all calls from people who are not high priority and who he does not know. In this case, however, the user will still receive all emails and text messages, no matter who sent them.

Figure 1 shows the framework structure and functional entities of IMS. The frame structure of IMS defined by 3GPP includes Call Session Control Function (Call Session Control Function, referred to as "CSCF"), Media Gateway Control Function (Media Gateway Control Function, referred to as "MGCF"), IMS Media Gateway (IMS-Media GateWay, referred to as "IMS-MGW"), Multimedia Resource Function Controller (Multimedia Resource Function Controller, referred to as "MRFC"), Multimedia Resource Function Processor (Multimedia Resource Function Processor, referred to as "MRFP"), Breakout Gateway Control Function (Breakout Gateway Control Function , referred to as "BGCF"), and IMS application server (Application Server, referred to as "AS") and Home Subscriber Server (Home Subscriber Server, referred to as "HSS") and other functional entities.

Among them, the CSCF is the core of the entire network, supports the SIP protocol to process SIP sessions, and is divided into an interrogating-CSCF (Interrogating-CSCF, "I-CSCF" for short) and a serving CSCF (Serving-CSCF, "S-CSCF" for short). Proxy CSCF (Proxy CSCF, referred to as "P-CSCF") is the entrance for user equipment (User Equipment, referred to as "UE") to access the IMS system, and realizes the functions of proxy (Proxy) and user agent (UserAgent) in the SIP protocol ; MGCF and IMS-MGW are functional entities that communicate with the CS domain and PSTN, and are respectively responsible for the intercommunication of control signaling and media streams; MRFC and MRFP are functional entities that implement multi-party conferences, and the MRFC on the control plane controls MRFP through H.248; The BGCF is the demarcation point between the IMS domain and the external network, and it chooses where to interconnect with the CS domain or PSTN.

In IMS, services are uniformly provided by the application server AS, and session control is completed by the S-CSCF. The two are completely separated in the network structure. The services are triggered by the S-CSCF to be processed by the AS through signing rules, and multiple ASs can work together. An IMS user accesses the IMS through the P-CSCF of the visited domain node where the current location is located, and the session and service control are always completed by the home domain node where the subscriber is subscribed. The session control and service control functions of the IMS have nothing to do with access. The user subscription data of the IMS is centrally managed in the HSS. The IMS realizes the intercommunication call with the fixed network circuit domain through the media gateway control node MGCF: that is, the IMS domain user and the fixed network circuit domain user can call each other.

Compared with other services, the IMS service has many advantages. For example, it supports WEB self-service, and users can perform self-service management and service customization very intuitively, such as customizing intelligent routing, ring back tones, calling party images, tasks and reminders, differentiated ringing, Various services such as abbreviated numbers, outgoing call restrictions, and incoming call restrictions greatly simplify the procedures for users to sign and register services. In addition, the IMS service supports some kind of control agent terminal (such as WEB Client mode), and the user can control the business process by clicking on the graphical interface, and the user can operate the business very intuitively, such as click to dial, click to conference, click to hold, click to resume, click to transfer , Click to queue, click to exit, click to connect and other business operations, which greatly simplifies the cumbersome operation steps for users when using services.

In addition, since IMS is the core network defined by the 3GPP standard for mobile networks, the services provided to mobile users, if the capabilities of fixed terminals allow or cooperate with some kind of control agent terminal, can be used by fixed network circuit domain users. services, realize equipment reuse, save operator investment, and bring new business growth points for fixed network users. The benefits are self-evident. Therefore, the IMS-based network convergence solution is a current research hotspot.

The purpose of the IMS-based network convergence solution is to make IMS a general-purpose platform based on SIP sessions, support multiple fixed and mobile access modes at the same time, and realize the convergence of fixed and mobile networks. However, due to technical limitations, IMS can only support call intercommunication between fixed network circuit domain users and IMS domain users, and cannot provide services for fixed network circuit domain users through IMS. The route does not pass through the IMS AS; when the IMS provides services for it, the call signaling route is triggered by the S-CSCF to the IMS AS, and the AS completes the service control. The support of IMS to fixed network NGN means that IMS is required to support various fixed access methods and mobile access methods at the same time, which is a technical problem in the industry at present. Although the call control of IMS adopts the SIP protocol stipulated by the Internet Engineering Task Force ("IETF"), corresponding enhancements and discards have been made for the characteristics of mobile access, mainly reflected in registration, authentication and session policies. etc., the specific message flow is somewhat different from the IETF's regulations, so the user in the circuit-switched domain needs to re-establish the session protocol to access the IMS.

At present, in order to provide business services for fixed network circuit domain users, PSTN/ISDN network implements business access for fixed network users through digital program-controlled switches and intelligent network nodes.

Since the call control and service control functions are implemented in the same network node, this solution has poor flexibility and is not conducive to rapid deployment and expansion of services. The modification of one function may lead to the change of another function, which increases potential risks; the deployment and expansion of some services may even cause the upgrade of the entire network node, which is costly and slow to deploy.

Secondly, since digital program-controlled switches and intelligent networks can only provide pure circuit domain services, the user's human-computer interaction mode is single, and the service experience is poor. Users can only use and set services by dialing buttons on fixed terminals. It is necessary to memorize various business codes and even business processes. Users are not very motivated to use the business, which is not conducive to the promotion of the business.

In addition, although the existing IMS provides a mechanism for separating service management, session control, and bearer access, it can provide rich multimedia services based on packet networks, and the network structure of IMS also supports fixed-mobile convergence services, but the IMS standard It only supports intercommunication calls with fixed network circuit domain users, and does not support providing service applications for fixed network circuit domain users. Therefore, when an operator owns an IMS network and a fixed network at the same time, it needs to repeatedly develop services to provide IMS services to fixed network users.

In practical application, the above solution has the following problems: the solution to provide services to fixed network users directly through the network nodes in the circuit domain is expensive, slow to deploy, and the user interface is single, which is not conducive to promotion; The solution for network users to provide services requires repeated service development, and cannot directly allow fixed network users to access IMS services, resulting in high operating costs.

The main reason for this situation is that the existing fixed network circuit switching mode is not flexible enough, and the cost of network facilities is high; and the IMS network does not provide a session protocol for direct access to fixed network users, and fixed network users cannot directly use the services provided by IMS .

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for providing services for circuit domain users through the packet domain, so that fixed network users can directly access IMS, use IMS services, and realize the integration of fixed network and mobile network at the service level. Fusion and reuse.

In order to achieve the above purpose, the present invention provides a method for providing services for circuit domain users through the packet domain, including the following steps,

The media gateway control function in the IP-based multimedia subsystem judges whether the fixed network circuit domain user whose signaling path passes through the media gateway control function has subscribed to the IP-based multimedia subsystem service, and if so, performs signaling message and Necessary conversion of message content parameters, sending a session initiation protocol request message to the corresponding service call session control function;

The service call session control function responds to the session initiation protocol request message from the media gateway control function, performs session control after obtaining the service subscription information of the current processing object, and sends the session initiation protocol request message to the application server corresponding to the service;

The application server responds to the session initiation protocol request message from the service call session control function, obtains the service subscription information of the current processing object, and performs service control on the CS domain user.

Wherein, the subscription information related to the fixed network CS domain user is stored in the home user server of the IP-based multimedia subsystem for query and download by other devices in the IP-based multimedia subsystem.

The telephone number of the fixed network circuit domain user in the session initiation protocol request message adopts the session initiation protocol uniform resource locator format.

When the CS domain user is the calling user, the method further includes the following steps,

The circuit domain network judges according to the subscription information of the circuit domain user whether he has subscribed to the multimedia subsystem service based on the Internet protocol, and if so, routes the call to the media gateway control function, and sends the call through the circuit domain network inter-office signaling Indicating that the IP-based multimedia subsystem needs to provide service control for the calling user;

The media gateway control function judges that the user is a CS domain user and subscribes to an Internet protocol-based multimedia subsystem service according to the CS domain network inter-office signaling, and converts the CS domain user number into a session initiation protocol by querying an electronic encoding server Uniform resource locator format, and then send a session initiation protocol request message to the caller service call session control function, which contains indication information for indicating that the user is a CS domain user who subscribes to the Internet protocol-based multimedia subsystem service, and uses the session The calling phone number in the Uniform Resource Locator format of the originating protocol;

The calling service call session control function responds to the session initiation protocol request message from the media gateway control function, determines that the user is a circuit domain user and subscribes to the multimedia subsystem service based on the Internet protocol according to the indication information therein, and sends the request message through the home subscriber server The query method obtains the service subscription information of the user, performs session control on the user's call, and sends a session initiation protocol request message to the application server corresponding to the service, which includes a message for indicating that the user is subscribed to an Internet protocol-based multimedia subsystem Instructions for CS domain users of the service;

The application server responds to the session initiation protocol request message from the service call session control function, determines that the user is a circuit domain user and subscribes to the multimedia subsystem service based on the Internet protocol according to the indication information therein, and uses the home subscriber server query method After obtaining the service subscription information of the user, perform service control on the call of the user, and return a session initiation protocol request message to the calling service call session control function after processing;

After receiving the SIP request message returned by the application server, the calling service call session control function continues to process the service-triggered or routing-addressed session of the CS domain user.

When the CS domain user is a called user and its outgoing signaling path has entered the IP-based multimedia subsystem, the method further includes the following steps,

On the outgoing signaling path, the calling service call session control function performs routing addressing for the CS domain user, and converts the CS domain user number into a session initiation protocol URL format by querying an electronic encoding server, Then routing and sending said session initiation protocol request message to the called service call session control function, wherein the called user number in the session initiation protocol uniform resource locator format is used;

The called service call session control function obtains the subscription information of the CS domain user through the home subscriber server query method, and sends a session initiation protocol request message to the called application server corresponding to the service;

The called application server obtains the subscription information of the CS domain user through the home user server query method, performs service control on the CS domain user, and returns a session initiation protocol to the called service call session control function after processing is completed. request message;

The called service call session control function responds to the called application server returning a session initiation protocol request message, and continues to process the service trigger of the CS domain user or the IP-based multimedia subsystem domain routing session;

After the called service call session control function processes the service trigger and the IP-based multimedia subsystem domain routing, it performs circuit domain routing addressing for the current called CS domain user, and assigns the CS domain user number to Restore the format of the Uniform Resource Locator from the Session Initiation Protocol to the original circuit domain format, and send it as the called number to the egress gateway control function through the session initiation protocol request message, and the egress gateway control function will route the call to the circuit domain network.

When the circuit user is a called user, and the outgoing signaling path does not enter the IP-based multimedia subsystem, the method includes the following steps,

The circuit domain network judges according to the subscription information of the called circuit domain user whether he has signed up for the Internet Protocol-based multimedia subsystem service, and if so, routes the call to the media gateway control function, and sends the call through the circuit domain network office Inter-signaling indicates that the IP-based multimedia subsystem needs to provide service control for the called user;

The media gateway control function judges that the user is a CS domain user and subscribes to an Internet protocol-based multimedia subsystem service according to the CS domain network inter-office signaling, and converts the CS domain user number into a session initiation protocol by querying an electronic encoding server Uniform resource locator format, and then send a session initiation protocol request message to the corresponding called service call session control function, wherein the called user number in the session initiation protocol uniform resource locator format is used;

The called service call session control function responds to the session initiation protocol request message from the media gateway control function, obtains the service subscription information of the user through the home user server query method, performs session control on the user's call, and reports to the service corresponding The application server sends a session initiation protocol request message;

The application server responds to the session initiation protocol request message from the called service call session control function, obtains the service subscription information of the user through the home user server query method, and performs service control on the user's call, and sends The called service call session control function returns a session initiation protocol request message;

The called service call session control function responds to the session initiation protocol request message returned by the called application server, and continues to process the service trigger of the CS domain user or the IP-based multimedia subsystem domain routing session;

After the called service call session control function processes the service trigger and the IP-based multimedia subsystem domain routing, it performs circuit domain routing addressing for the current called CS domain user, and assigns the CS domain user number to Restore the format of the session initiation protocol uniform resource locator to the original circuit domain format, and send a session initiation protocol request message to the egress gateway control function as the called number, and the egress gateway control function routes the call to the circuit domain network .

The electronic encoding server stores and manages the corresponding relationship between the session initiation protocol uniform resource locator and the CS domain user number, and provides a mutual query service between the session initiation protocol uniform resource locator and the CS domain user number .

In the session initiation protocol request message, through the extended definition of the "purpose" parameter in the "call information" header field, it indicates that the calling user is a circuit domain user and subscribes to the multimedia subsystem service based on the Internet Protocol; in the In the calling service call session control function and the calling application server, by processing the extended definition of the "purpose" parameter in the "call information" header field in the received session initiation protocol request message, it is judged that the calling user is A CS domain user subscribes to an IP-based multimedia subsystem service.

The subscription information includes the CS domain user number information, and the called party obtains the CS domain user number through the subscription information, and implements the CS domain network after the multimedia subsystem domain based on the Internet protocol has processed the service. routing addressing.

The subscription information stored and managed in the home user server corresponds to that of the CS domain user, including the subscription information and routing information of the IP-based multimedia subsystem service of the CS domain user.

In the session initiation protocol request message, the IP-based multimedia subsystem service is triggered by using the public service identifier as the destination address.

When the CS domain user is the calling user, the steps include the following steps,

The circuit domain network judges according to the subscription information of the circuit domain user that he has signed up for the multimedia subsystem service based on the Internet protocol, routes the call to the media gateway control function, and indicates the need for The IP-based multimedia subsystem provides service control for the calling user;

The media gateway control function judges that the user is a circuit domain user and subscribes to an Internet protocol-based multimedia subsystem service according to the inter-office signaling of the circuit domain network, and obtains the corresponding public service identifier according to the subscription information, and then sends the The corresponding service call session control function sends a session initiation protocol request message, which includes the public service identifier;

The service call session control function obtains the subscription information corresponding to the public service identifier through a home subscriber server query method, and then sends a session initiation protocol request message to the application server corresponding to the service, which includes the public service identifier;

The application server obtains the subscription information corresponding to the public service identifier through the home user server query method, performs service control on the circuit domain user, and returns a session initiation protocol to the service call session control function after processing is completed. request message;

After receiving the SIP request message returned by the application server, the service call session control function continues to process service triggering or routing addressing.

When the CS domain user is a called user and its outgoing signaling path has entered the IP-based multimedia subsystem, the method further includes the following steps,

On the outgoing signaling path, the service call session control function performs routing addressing for the CS domain user, and routes the called party to the egress gateway control function;

The egress gateway control function routes the called party to the media gateway control function;

The media gateway control function judges whether the called party has processed the service according to the service processing flag of the multimedia subsystem based on the Internet protocol, and if so, routes the called party to the circuit domain network, or judges that the user is a circuit domain network. The domain user subscribes to the Internet protocol-based multimedia subsystem service, and obtains the corresponding public service identifier according to the subscription information, and then sends a session initiation protocol request message to the corresponding service call session control function, which includes using the public service flag, and at the same time set the user's IP-based multimedia subsystem service processing flag;

The service call session control function obtains the subscription information corresponding to the public service identifier through a home subscriber server query method, and then sends a session initiation protocol request message to the application server corresponding to the service, which includes the public service identifier;

The application server obtains the subscription information corresponding to the public service identifier through the home user server query method, performs service control on the circuit domain user, and returns a session initiation protocol to the service call session control function after processing is completed. request message;

After receiving the SIP request message returned by the application server, the service call session control function continues to process service triggering or routing addressing.

The circuit user is a called user, and the outgoing signaling path does not enter the IP-based multimedia subsystem, comprising the following steps,

The circuit domain network judges according to the subscription information of the called circuit domain user that he has signed up for the Internet protocol-based multimedia subsystem service, routes the call to the media gateway control function, and sends the call to the media gateway control function through the circuit domain network interoffice information Instructions related information;

The media gateway control function judges that the user is a circuit domain user and subscribes to an Internet protocol-based multimedia subsystem service according to the inter-office signaling of the circuit domain network, and obtains the corresponding public service identifier according to the subscription information, and reports to the corresponding The serving call session control function sends a session initiation protocol request message, which includes the public service identifier;

The service call session control function obtains the subscription information corresponding to the public service identifier through a home subscriber server query method, and then sends a session initiation protocol request message to the application server corresponding to the service, which includes the public service identifier;

The application server obtains the subscription information corresponding to the public service identifier through the home user server query method, performs service control on the circuit domain user, and returns a session initiation protocol to the service call session control function after processing is completed. request message;

After receiving the SIP request message returned by the application server, the service call session control function continues to process service triggering or routing addressing.

In the session initiation protocol request message, the public service identifier is carried as a destination address identifier.

In the session initiation protocol request message, the CS domain user number of the called user is carried by a message body.

The service call session control function and the application server obtain the CS domain user number of the called user in the message body of the received Session Initiation Protocol request message, and use it in the Internet protocol-based multimedia subsystem domain. Realize the routing addressing of the circuit domain network after the business is processed; it is also used for the business control performed by the application server.

The subscription information stored and managed in the home subscriber server corresponds to the public service identification service, and includes the public service identification service subscription data, the calling or called attribute of the public service identification service. The application server determines whether to provide service control for the calling CS domain user or the called CS domain user according to the calling or called attribute in the subscription data of the public service identifier.

Also includes the following steps,

the circuit domain network routes all calls to the media gateway control function;

The media gateway control function intercepts the call, judges through authentication that the user is a circuit domain user and subscribes to an Internet protocol-based multimedia subsystem service, and if so, triggers an Internet protocol-based multimedia subsystem session; otherwise, the The call is returned to the CS domain network.

Also includes the following steps,

The circuit domain user directly dials the service access code and then dials the called number, the circuit domain network analyzes the service access code, and routes the call to the media gateway control function;

The media gateway control function intercepts the call, judges through authentication that the user is a circuit domain user and subscribes to an Internet protocol-based multimedia subsystem service, and if so, triggers an Internet protocol-based multimedia subsystem session; otherwise, the The call is returned to the CS domain network.

Also includes the following steps,

When the session initiation protocol request message transmits the relevant information of the CS domain user through the public service identifier, after the media gateway control function determines that the user is a CS domain user and subscribes to an Internet protocol-based multimedia subsystem service, according to the The service subscription information of the CS domain user is obtained to obtain the corresponding public service identifier.

In the circuit domain network, the originating office switch or the tandem office switch of the calling circuit domain user judges that the calling circuit domain user has subscribed to the multimedia subsystem service based on the Internet protocol. When the CSIP request message transmits the relevant information of the CS domain user through the public service identifier, the originating office switch or the tandem office switch combines a specific prefix code according to the service subscription information.

In the circuit domain network, the land office switch or the tandem switch of the called circuit domain user judges that the called circuit domain user has subscribed to the multimedia subsystem service based on the Internet protocol. When the SIP request message transmits the relevant information of the CS domain user through the public service identifier, the landing office switch or the tandem switch combines a specific prefix code according to the service subscription information.

The fixed network home location register is configured in the circuit domain network, and when the call of the circuit domain user passes through the fixed network home location register, it is judged whether the circuit domain user has subscribed to the multimedia subsystem service based on the Internet protocol. When the SIP request message transmits the relevant information of the CS domain user through the public service identifier, the fixed network home location register combines a specific prefix code according to the service subscription information.

The circuit domain network inter-office signaling sent by the circuit domain network to the media gateway control function is the initial address message message of the ISDN user part signaling, and the "called" of the initial address message message is The "subscriber number" parameter is composed of the CS domain user's called number plus a specific prefix code, which is used to indicate that the CS domain user has subscribed to the Internet protocol-based multimedia subsystem service.

After receiving the initial address message, the media gateway control function performs number analysis on the specific prefix code to determine whether the CS domain user has subscribed to the Internet protocol-based multimedia subsystem service. When the session initiation protocol request message transmits relevant information of the CS domain user through the public service identifier, the specific prefix code is provided by the CS domain network according to the IP-based multimedia subsystem service of the CS domain user. The subscription information is combined and generated, and the media gateway control function translates the public service identifier according to the specific prefix code.

After receiving the initial address message, the media gateway control function obtains the called number of the CS domain user according to the "called user number" parameter.

When the media gateway control function routes to the service call session control function, the routing address of the service call session control function is obtained through the routing relationship table set in the data configuration mode.

The method for querying the home user server includes the following steps,

The query initiator judges whether the information to be queried is local, and if so, directly invokes the local information, otherwise inquires and downloads the information to be queried from the home user server;

The query initiator keeps and stores the queried information, and performs aging update;

Wherein the query initiator is any one of the service call session control function and the application server.

Through comparison, it can be found that the difference between the technical solution of the present invention and the prior art is that the present invention enables the IMS not only to support intercommunication calls with fixed network circuit domains, but also to The IMS can provide services for the fixed network circuit domain users; among them, the MGCF can determine whether the fixed network circuit domain users who have the signaling path through the MGCF subscribe to the IMS service, and trigger the IMS session, and the S-CSCF processes the session and route control, according to the IMS service The subscription information triggers the AS, and the AS controls the services of the fixed network circuit domain users and provides IMS services; in addition, the HSS function is extended to store and manage the IMS subscription service data related to the fixed network circuit domain users.

The difference in this technical solution has brought obvious beneficial effects, that is, using IMS to provide services for fixed network circuit domain users, realizing that services have nothing to do with the network, greatly speeding up service deployment and expansion, and greatly reducing service customization costs; at the same time IMS also brings a brand-new service experience to fixed network circuit domain users, improves the user interface, facilitates user operations, increases user enthusiasm, and brings new business growth points for operators; at the same time, it realizes the integration of fixed network and mobile network services. Reuse and converge to reduce operating costs.

Description of drawings

Figure 1 is a schematic diagram of the framework structure and functional entities of the IMS;

Fig. 2 is according to an embodiment of the present invention the user triggers the IMS service processing flow;

Fig. 3 is a PSI-triggered IMS service processing flow according to an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

According to the framework of the interconnection between the circuit domain of the fixed network and the IMS and the IMS session processing specification, the invention provides the session flow and the related processing method for the fixed network user to access the IMS. First of all, fixed network users can be identified by SIP Universal Resource Locator (Universal Resource Locator, “URL” for short) in the IMS domain or public service identity (Public Service Identity, “PSI” for short) through their IMS service subscription information, then The subscription information of the corresponding user or PSI is maintained and managed by the HSS for query and download by other functional entities. Secondly, whether the fixed network user subscribes to the IMS service is determined by the PSTN network node and then forwarded to the MGCF, or directly forwarded to the MGCF for determination. After the service request enters the IMS domain or itself passes through the IMS domain, the MGCF or S-CSCF judges and triggers the session, and routes the session to the AS corresponding to the service according to the subscription information, and the AS performs service control for fixed network users and provides IMS services. After the service ends, it can be routed back to the PSTN by the BGCF to end the processing of the IMS domain. During the whole process, the session in the IMS domain complies with the rules of the SIP protocol, but necessary call-related information needs to be carried in the SIP request information, or related information should be included in the subscription information. In this way, IMS can be directly accessed by fixed network users and IMS services can be provided.

In order to describe the essence of the present invention in detail, feasible embodiments in various situations are given below.

In one embodiment of the present invention, the SIP URL is used to identify the fixed network user in the IMS domain, and the IMS service processing flow is triggered by the user. In various situations such as calling and called by fixed network CS domain users, the access processing flow is shown in Figure 2 respectively.

Fig. 2(a) shows the IMS service processing flow when a fixed network CS domain user calls a call according to an embodiment of the present invention.

In step 211, first, the fixed network CS domain user initiates a call, and the PSTN judges that the calling user has subscribed to the IMS service according to the service subscription information of the calling user, routes the call to the MGCF, and at the same time indicates to the MGCF that the call is not an interworking call, and It is necessary for the IMS to provide service control for the calling user. In one embodiment of the present invention, the indicator is transmitted to the MGCF by using PSTN inter-office signaling. There are many kinds of PSTN inter-office signaling. In a preferred embodiment of the present invention, an Initial Address Message (InitialAddress Message, referred to as ISUP) in one of the ISDN User Part (ISDN User Part, referred to as "ISUP") signaling is used. "IAM") to describe. The IAM message indicates that the caller is a fixed network user and subscribes to the IMS service. In a preferred embodiment of the present invention, when the PSTN sends an IAM message to the MGCF, a specific prefix code is added to the mandatory parameter "called user number" in the IAM message to indicate that the calling user has subscribed to the IMS service, IMS is required to provide service control for it.

Then enter step 212, when the MGCF receives the IAM message, it analyzes the "called subscriber number" in the message, judges that the calling user has signed an IMS service according to its specific prefix code, and deletes the prefix code simultaneously to obtain the real PSTN number of the called party. Since the user identification in the IMS network is in the SIP URL format, and the user number representation in the PSTN is in the E.164 format, the MGCF needs to first request the electronic numbering server (Electronic Numbering Server, referred to as "ENUM Server") to send the calling user The number is translated from E.164 format to SIP URL format. Here the ENUM Server needs to store and manage the corresponding conversion relationship of the fixed network circuit domain user number domain SIP URL.

Then enter step 213, the ENUM Server translates the calling party number from the E.164 format into the SIP URL format by configuration query, and returns the translation result to the MGCF.

Enter step 214 then, MGCF translates IAM message into SIP request (INVITE) message, and the calling address in the INVITE message adopts the SIP URL format after translation. At the same time, it indicates in the INVITE message that the calling user is a fixed network circuit domain user and has signed an IMS service sign. In one embodiment of the present invention, the extended definition indication of the parameter "purpose" (purpose) in the additional information of the calling user or called user is provided through the "Call-Info" header field in the INVITE message The calling user is a fixed network circuit domain user and has signed an IMS service. MGCF sends the INVITE message to S-CSCF1. (Here S-CSCF1 represents the S-CSCF that handles the calling session control, that is, the calling S-CSCF; S-CSCF2 represents the S-CSCF that handles the called session control, that is, the called S-CSCF)

Then enter step 215, after S-CSCF1 receives the INVITE message, process the session control of the calling user. According to the value of the purpose parameter in the Call-Info header field in the message, it is determined that the calling user is a fixed network circuit domain user and has subscribed to the IMS service. S-CSCF1 queries the user's subscription data and if it does not exist, it requests the HSS to download the user's subscription data. S-CSCF1 triggers an IMS AS1 according to the downloaded user's service subscription rule (here, AS1 means to control the service of the calling party, that is, the calling AS; AS2 means to control the service of the called party, that is, the called AS), S-CSCF1 sends an INVITE message to the AS1, and the message still needs to indicate that the calling user is a fixed network circuit domain user and has signed an IMS service.

Then enter step 216, when the IMS AS1 receives the INVITE message, it judges that the calling user is a fixed network circuit domain user and has signed an IMS service according to the purpose parameter value of the Call-Info header field in the message. AS1 inquires about the user's subscription data, and if it does not exist, it requests the HSS to download the user's subscription data. AS1 performs corresponding service control according to the user subscription data download result, and sends an INVITE message to S-CSCF1 after the processing is completed.

Finally, in step 217, S-CSCF1 receives the INVITE message, and continues to trigger services for the calling user or perform routing addressing for the called user. If a new service AS continues to be triggered, S-CSCF1 sends an INVITE message to the new AS, which still indicates that the calling user is a fixed network circuit domain user and has signed an IMS service, and the process re-enters step 216; otherwise, S-CSCF1 completes the routing addressing function for the called user.

Fig. 2(b) shows an IMS service processing flow when a fixed network CS domain user is called and the outgoing path enters the IMS domain according to an embodiment of the present invention.

When a call is made to a fixed network circuit domain user, the IMS needs to provide some kind of service application control for the called user, and the first half of the call, that is, the outgoing signaling path has entered the IMS, and the calling user's service After processing, the IMS performs routing addressing for the called user in the fixed network circuit domain.

First in step 221, S-CSCF1 performs routing addressing for the called user in the fixed network circuit domain, and the called address is in the E-164 format, and then requests the ENUM Server to translate the called user number from the E.164 format into SIP URL format.

Then enter in step 222, the ENUM Server translates the called subscriber number from the E.164 format into the SIP URL format by configuration query, and returns the translation result to the S-CSCF1.

Then enter in step 223, S-CSCF1 obtains the called subscriber number of SIP URL format, sends INVITE message to S-CSCF2 of called home domain, and the called address in the message adopts the SIP URL format after translation. The routing addressing method of S-CSCF1 to S-CSCF2 is completely the same as that defined in the 3GPP IMS standard, and will not be described in the present invention.

Then enter step 224, S-CSCF2 receives the INVITE message, and processes the session control of the called user. Query the called user's subscription data if it does not exist, then request the HSS to download, and trigger an IMS AS2 according to the downloaded user's service subscription rules, and the AS2 will provide the called user with relevant service application control. S-CSCF2 sends an INVITE message to the AS2.

Then enter step 225, IMS AS2 receives the INVITE message, inquires if the subscription data of the called user does not exist, then requests downloading to the HSS, and performs corresponding application service control according to the download result of the user subscription data. - CSCF2 sends INVITE message.

Then enter step 226, S-CSCF2 receives the INVITE message from the AS, and continues to perform service triggering or routing addressing for the called user. If a new service AS continues to be triggered, the S-CSCF2 sends an INVITE message to the new AS, and the new AS receives the INVITE message, and the process re-enters step 225 . Otherwise, S-CSCF2 routes and addresses the current called user. If the called user does not change due to the service control of the AS, S-CSCF2 judges that there is a valid "circuit domain routing number" in the subscription data of the called user previously downloaded from the HSS request, and the "specific prefix code" + "called PSTN number of the called user", the "specific prefix code" indicates that S-CSCF2 does not need to request ENUMServer to translate the called number in E.164 format, and S-CSCF2 uses the PSTN number of the called user as the called number in the INVITE message The calling address is sent to the BGCF, and step 227 is entered. Otherwise, S-CSCF2 continues to perform routing addressing for the current called user in the IMS domain.

In step 227, after receiving the INVITE message, the BGCF routes the call to the PSTN, and the flow is defined with the 3GPP IMS standard. The called party is continued to be addressed by the PSTN

Fig. 2(C) shows an IMS service processing flow when a fixed network circuit domain user is called and the outgoing path does not enter the IMS domain according to an embodiment of the present invention.

A fixed network circuit domain user is called in. This call requires the IMS to provide some kind of service application control for the called user, but the first half of the call—that is, the outgoing signaling path does not pass through the IMS. The process is shown in the figure below.

First, in step 231, a call is made to a fixed network circuit domain user, the PSTN receives the IAM message, and judges that the called user has signed up for the IMS service according to the called user's subscription information, and the PSTN sends an IAM message to the MGCF, and instructs the called user to sign up IMS service, in a preferred embodiment of the present invention, when the PSTN sends an IAM message to the MGCF, a specific prefix code is added to the mandatory parameter "called user number" in the IAM message to indicate that the called user subscribes IMS service needs to be provided by IMS for service control.

Then enter step 232, MGCF receives the IAM message, performs number analysis on the "called user number" in the message, and after judging that the called user has signed an IMS service according to its specific prefix code, deletes the prefix code to obtain the real called party Call the user PSTN number. MGCF requests ENUM Server to translate the called number from E.164 format to SIP URL format.

Then enter step 233, the ENUM Server translates the called user number from the E.164 format into the SIP URL format by configuration query, and returns the translation result to the MGCF.

Then enter step 234, the MGCF translates the IAM message into a SIP INVITE message, and the called address in the INVITE message adopts the SIP URL format after translation.

Then enter step 235, S-CSCF2 receives the INVITE message, and processes the session control of the called user. Query the called user's subscription data if it does not exist, then request the HSS to download, and trigger an IMS AS2 according to the downloaded user's service subscription rules, and the AS2 will provide the called user with relevant service application control. S-CSCF2 sends an INVITE message to the AS2.

Then enter step 236, IMS AS2 receives the INVITE message, inquires if the subscription data of the called user does not exist, then requests downloading to the HSS, and performs corresponding service control according to the download result of the user subscription data. Send INVITE message.

Then enter step 237, S-CSCF2 receives the INVITE message from the AS, and continues to perform service triggering or routing addressing for the called user. If a new service AS continues to be triggered, the S-CSCF2 sends an INVITE message to the new AS, and the new AS receives the INVITE message, and the flow re-enters step 236 . Otherwise, S-CSCF2 routes and addresses the current called user. If the called user does not change due to the service control of the AS, S-CSCF2 judges that there is a valid "circuit domain routing number" in the subscription data of the called user previously downloaded from the HSS request, and the "specific prefix code" + "called PSTN number of the calling user", the "specific prefix code" indicates that S-CSCF2 does not need to request ENUM Server to translate the called number in E.164 format, and S-CSCF2 uses the PSTN number of the called user as the INVITE message The called address is sent to the BGCF, and step 238 is entered. Otherwise, S-CSCF2 continues to perform routing addressing for the current called user in the IMS domain.

In step 238, after receiving the INVITE message, the BGCF routes the call to the PSTN, and the process is defined with the 3GPP IMS standard. The called party continues to be addressed by the PSTN.

In an embodiment of the present invention, the MGCF selects an S-CSCF for routing through data configuration, such as directly specifying a certain type of user corresponding to an S-CSCF in the configuration data.

In one embodiment of the present invention, the PSTN determines the user's IMS subscription characteristics and notifies the MGCF through a message through a specific prefix code. After the MGCF performs number analysis on the prefix code and determines that the user has signed an IMS service, it requests the ENUM Server to The PSTN number in the E.164 format of the calling user or called user is translated into the SIP URL format.

In another embodiment of the present invention, the PSTN does not make a judgment, and the PSTN directly routes the user's call to the MGCF unconditionally, and the MGCF provides the user authentication processing function to intercept the call. If the user has signed an IMS service, the MGCF requests the ENUM Server to The PSTN number in the E.164 format of the calling user or called user is converted into a SIP URL format; if there is no IMS service subscription, the MGCF will return the call to the PSTN.

In another embodiment of the present invention, the fixed network circuit domain user can also directly dial the IMS service access code and then dial the called number. The PSTN performs number analysis on the service access code and routes the call to the MGCF, which provides The user authentication processing function intercepts the call. If the user subscribes to the IMS service, the MGCF requests the ENUM Server to translate the PSTN number in the E.164 format of the calling user or the called user into the SIP URL format; if the user does not subscribe to the IMS service, The MGCF returns the call to the PSTN.

In one embodiment of the present invention, the fixed network circuit domain user sets a valid "circuit domain routing number" in the IMS subscription data, so that after the IMS handles the service control of the called fixed network circuit domain user, the call Can enter the PSTN domain to address the called user.

Those skilled in the art can understand that, in addition to the method of setting the "circuit domain routing number" in the subscription data, any method can be adopted so that after the IMS handles the service control of the called fixed network circuit domain user, the S-CSCF The PSTN number of the called user can be obtained again, and the call can be routed to the BGCF, so as to realize the object of the present invention without affecting the essence and scope of the present invention.

In one embodiment of the present invention, the PSI is used to identify the IMS service provided for the fixed network user, and the IMS service processing flow is triggered by the PSI. In various situations such as calling and called by fixed network CS domain users, the access processing flow is shown in Figure 3 respectively.

In the embodiment of SIP URL identification, a significant difference between the call flow of the calling fixed network CS domain user and the called fixed network CS domain user in the IMS domain is: S-CSCF1 needs to determine the current session, and the calling party is a fixed network CS domain user. The user has subscribed to the IMS service. If the user's subscription data does not exist, it will request to download. This is an extension of the 3GPP IMS standard definition process; and S-CSCF2 can request to download as long as it finds that the called subscription data does not exist. This is in line with the 3GPP IMS standard definition process. Using the PSI to trigger the IMS service can make the download process of the subscription data of the IMS subscription service of the calling party's fixed network circuit domain conform to the definition of the 3GPP IMS standard.

Fig. 3(a) shows the IMS service processing flow when a fixed network CS domain user calls a call according to an embodiment of the present invention.

In step 311, the fixed network circuit domain user initiates a call, and the PSTN judges that the caller has subscribed to the IMS service according to the subscription information of the calling user, and combines a specific service prefix code according to the IMS service subscription information of the calling user, and sends the The service prefix code is added in front of the parameter "called user number" in the IAM message, and the IAM message is sent to the MGCF.

Then enter step 312, MGCF receives the IAM message, carries out the number analysis to the "called subscriber number" in the message, judges that the calling user has signed an IMS service according to its specific service prefix code, and translates the service prefix code into A corresponding PSI, and delete the prefix code to obtain the real PSTN number of the called party. The MGCF translates the IAM message into an INVITE message, and fills the PSI into the INVITE message according to the definition of the IMS standard. In one embodiment of the present invention, the MGCF fills the called party's PSTN number into other areas in the INVITE message, such as the message body (Message body) carried in the INVITE message. The MGCF sends the INVITE message to the S-CSCF2, and the method for the MGCF to obtain the routing address of the S-CSCF2 is the same as that defined in the 3GPP IMS standard.

Then enter step 313, S-CSCF2 receives the INVITE message, judges whether the service subscription data corresponding to the PSI exists, and if not, requests the HSS to download. Trigger an IMS AS2 according to the downloaded signing rules. S-CSCF2 sends an INVITE message to AS2

Then enter step 314, AS2 receives the INVITE message, takes out the called user number from a specific area in the message, and judges whether the service subscription data corresponding to the PSI exists, if not, then requests the HSS to download. According to the downloaded subscription data, the subscription data indicates that the call triggers the calling service, and AS2 performs corresponding service control on the calling user, and sends an INVITE message to S-CSCF2 after the processing is completed.

Then enter step 315, S-CSCF2 receives the INVITE message from AS2, and continues to perform service triggering or routing addressing for PSI. If a new service AS continues to be triggered, S-CSCF2 sends an INVITE message to the newly triggered AS, and then enters step 314; if it is routing addressing, S-CSCF2 takes out the current called address from a specific area in the message for address routing.

Fig. 3(b) shows an IMS service processing flow when a fixed network CS domain user is called and the outgoing path enters the IMS domain according to an embodiment of the present invention.

When a call is made to a fixed network circuit domain user, the IMS needs to provide some kind of service application control for the called user, and the first half of the call, that is, the outgoing signaling path has entered the IMS, and the calling user's service After processing, the IMS performs routing addressing for the called user in the fixed network circuit domain.

First, in step 321, the S-CSCF performs routing addressing for the called user in the fixed network circuit domain. The called address is in E.164 format, and the translation request to the ENUM Server fails, and the S-CSCF routes the session to the BGCF.

Then in step 322, the BGCF routes the session to the MGCF.

Then enter step 323, the MGCF receives the INVITE message, judges that the called user in the fixed network circuit domain has not processed the IMS service, and then performs service authentication processing on the called user. If the called user has signed an IMS service, the MGCF The specific service subscription information is combined to form a corresponding PSI; if the called user has not subscribed to the IMS service or has processed the IMS service, the MGCF will route the call to the PSTN. The MGCF fills the PSI into the INVITE message according to the definition of the IMS standard, and fills the PSTN number of the called user into other fields in the message. The MGCF sends the INVITE message to the S-CSCF2, and the method for the MGCF to obtain the routing address of the S-CSCF2 is the same as that defined in the 3GPP IMS standard. At the same time, the MGCF sets the flag indicating that the called user has processed the IMS service.

Then enter step 324, S-CSCF2 receives the INVITE message, judges whether the service subscription data corresponding to the PSI in the To header field exists, and if not, requests downloading from the HSS. Trigger an IMS AS2 according to the downloaded signing rules. S-CSCF2 sends an INVITE message to AS2

Then enter step 325, AS2 receives the INVITE message, takes out the called subscriber number from a specific area in the message, and judges whether the service subscription data corresponding to the PSI exists, if not, then requests downloading to the HSS. According to the downloaded subscription data (in this subscription data, it can be indicated that this is to trigger the called service), the corresponding service control is performed on the called user, and the INVITE message is sent to the S-CSCF2 after the processing is completed.

Then enter step 326, S-CSCF2 receives the INVITE message from AS2, and continues to perform service triggering or routing addressing for PSI. If a new service AS continues to be triggered, S-CSCF2 sends an INVITE message to the newly triggered AS, and the process enters step 325; if it is routing addressing, S-CSCF2 extracts the current called address from a specific area in the message body , for address routing.

Fig. 3(C) shows an IMS service processing flow when a fixed network circuit domain user is called and the outgoing path does not enter the IMS domain according to an embodiment of the present invention.

A fixed network circuit domain user is called in. This call requires the IMS to provide some kind of service application control for the called user, but the first half of the call—that is, the outgoing signaling path does not pass through the IMS. The process is shown in the figure below.

First, in step 331, a call is made to a fixed network circuit domain user, and the PSTN receives the IAM message, judges that the called user has signed an IMS service according to the subscription information of the called user, and combines a specific IMS service subscription information according to the called user's IMS service subscription information The service prefix code is added to the front of the parameter "called user number" in the IAM message, and the IAM message is sent to the MGCF.

Then enter step 332, the MGCF receives the IAM message, performs number analysis on the "called subscriber number" in the message, judges that the called subscriber has signed an IMS service according to its specific service prefix code, and translates the service prefix code into a corresponding PSI, and delete the prefix code to obtain the real PSTN number of the called party. The MGCF translates the IAM message into an INVITE message, fills the PSI into the INVITE message according to the definition of the IMS standard, and fills in other areas of the message with the PSTN number of the called user. The MGCF sends the INVITE message to the S-CSCF2, and the method for the MGCF to obtain the routing address of the S-CSCF2 is the same as that defined in the 3GPP IMS standard.

Then enter step 333, S-CSCF2 receives the INVITE message, judges whether the service subscription data corresponding to the PSI exists, and if not, requests the HSS for downloading. Trigger an IMS AS2 according to the downloaded signing rules. S-CSCF2 sends an INVITE message to AS2.

Then enter step 334, AS2 receives the INVITE message, takes out the called subscriber number from a certain specific area in the message, and judges whether the service subscription data corresponding to the PSI exists, if not, then requests downloading to the HSS. The downloaded subscription data indicates that the call triggers the called service, and AS2 performs corresponding service control on the called user, and sends an INVITE message to S-CSCF2 after the processing is completed.

Then enter step 335, S-CSCF2 receives the INVITE message from the AS, and continues to perform service triggering or routing addressing on the PSI. If a new service AS continues to be triggered, S-CSCF2 sends an INVITE message to the newly triggered AS, and the process re-enters step 334; address for addressing routing.

In one embodiment of the present invention, the PSTN determines the user's IMS subscription characteristics and combines them into a service prefix code to inform the MGCF through a message, and the MGCF translates the service prefix code into PSI.

In another embodiment of the present invention, the PSTN does not make a judgment, the PSTN directly routes the user's call to the MGCF unconditionally, and the MGCF provides the user authentication processing function to intercept the call. If the user subscribes to the IMS service, the MGCF provides a specific service subscription information. Through this authentication process, the MGCF judges that if the called user subscribes to the IMS service, the corresponding PSI is directly combined according to the service subscription information; if the called user does not subscribe to the IMS service, the MGCF returns the call to the PSTN.

In another embodiment of the present invention, the fixed network circuit domain user can also directly dial the IMS service access code and then dial the called number. The PSTN performs number analysis on the service access code and routes the call to the MGCF, which provides The user authentication processing function intercepts the call. If the user subscribes to the IMS service, the MGCF provides specific service subscription information. Through this authentication process, the MGCF judges that if the called user subscribes to the IMS service, the corresponding PSI is directly combined according to the service subscription information; if the called user does not subscribe to the IMS service, the MGCF returns the call to the PSTN.

In one embodiment of the present invention, the network node that determines that the calling user is an IMS subscriber in the PSTN may be the originating office or the tandem office switch of the calling user; the network node that determines that the called user is an IMS subscriber in the PSTN The network node may be a landing office or a tandem office switch of the called user. In another embodiment of the present invention, a fixed network home location register (Home Location Register, referred to as "HLR") is configured in the PSTN network, and when a call passes through the HLR, the HLR judges that the call is subscribed to an IMS service.

In an embodiment of the present invention, the method for entities such as S-CSCF and AS to query the HSS for downloading subscription information may be one of the following methods. The S-CSCF and the like do not store the downloaded subscription information, that is, after the session is released That is to delete, each call will be re-downloaded; or permanently store the subscription information, that is, before each call, first check whether the subscription information is stored locally, if not, go to the HSS to download, and the subscription information will still be stored after the session is released; or The data aging mechanism is adopted, that is, the subscription information is stored for a period of time. If the threshold is exceeded (for example, there is no related call for more than 24 hours), the entity deletes the locally stored subscription data.

Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein, and without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (28)

1. A method for providing services to circuit domain users through a packet domain, characterized in that it comprises the following steps, The media gateway control function in the IP-based multimedia subsystem judges whether the fixed network circuit domain user whose signaling path passes through the media gateway control function has subscribed to the IP-based multimedia subsystem service, and if so, sends the signaling message and the message Necessary conversion of content parameters, sending a session initiation protocol request message to the corresponding service call session control function; The service call session control function responds to the session initiation protocol request message from the media gateway control function, performs session control after obtaining the service subscription information of the current processing object, and sends the session initiation protocol request message to the application server corresponding to the service; The application server responds to the session initiation protocol request message from the service call session control function, obtains the service subscription information of the current processing object, and performs service control on the CS domain user. 2. The method for providing services for circuit domain users through the packet domain according to claim 1, characterized in that the information related to the fixed network circuit domain users is stored in the home user server of the Internet protocol-based multimedia subsystem. The subscription information for other devices in the IP-based multimedia subsystem to query and download. 3. The method for providing services for circuit domain users through the packet domain according to claim 2, wherein the telephone number of the fixed network circuit domain user in the session initiation protocol request message adopts session initiation protocol uniform resource location device format. 4. The method for providing services for CS domain users through PS domain according to claim 3, characterized in that, when the CS domain user is the calling user, the method further comprises the following steps, The circuit domain network judges according to the subscription information of the circuit domain user whether he has subscribed to the multimedia subsystem service based on the Internet protocol, and if so, routes the call to the media gateway control function, and sends the call through the circuit domain network inter-office signaling Indicating that the IP-based multimedia subsystem needs to provide service control for the calling user; The media gateway control function judges that the user is a CS domain user and subscribes to an Internet protocol-based multimedia subsystem service according to the CS domain network inter-office signaling, and converts the CS domain user number into a session initiation protocol by querying an electronic encoding server Uniform resource locator format, and then send a session initiation protocol request message to the caller service call session control function, which contains indication information for indicating that the user is a CS domain user who subscribes to the Internet protocol-based multimedia subsystem service, and uses the session The calling phone number in the Uniform Resource Locator format of the originating protocol; The calling service call session control function responds to the session initiation protocol request message from the media gateway control function, determines that the user is a circuit domain user and subscribes to the multimedia subsystem service based on the Internet protocol according to the indication information therein, and sends the request message through the home subscriber server The query method obtains the service subscription information of the user, performs session control on the user's call, and sends a session initiation protocol request message to the application server corresponding to the service, which includes a message for indicating that the user is subscribed to an Internet protocol-based multimedia subsystem Instructions for CS domain users of the service; The application server responds to the session initiation protocol request message from the service call session control function, determines that the user is a circuit domain user and subscribes to the multimedia subsystem service based on the Internet protocol according to the indication information therein, and uses the home subscriber server query method After obtaining the service subscription information of the user, perform service control on the call of the user, and return a session initiation protocol request message to the calling service call session control function after processing; After receiving the SIP request message returned by the application server, the calling service call session control function continues to process the service-triggered or routing-addressed session of the CS domain user. 5. The method for providing services for CS domain users through PS domain according to claim 3, characterized in that, when the CS domain user is a called user and its outgoing signaling path has entered the IP-based When the multimedia subsystem is used, the method also includes the following steps, On the outgoing signaling path, the calling service call session control function performs routing addressing for the CS domain user, and converts the CS domain user number into a session initiation protocol URL format by querying an electronic encoding server, Then routing and sending said session initiation protocol request message to the called service call session control function, wherein the called user number in the session initiation protocol uniform resource locator format is used; The called service call session control function obtains the subscription information of the CS domain user through the home subscriber server query method, and sends a session initiation protocol request message to the called application server corresponding to the service; The called application server obtains the subscription information of the CS domain user through the home user server query method, performs service control on the CS domain user, and returns a session initiation protocol to the called service call session control function after processing is completed. request message; The called service call session control function responds to the called application server returning a session initiation protocol request message, and continues to process the service trigger of the CS domain user or the IP-based multimedia subsystem domain routing session; After the called service call session control function processes the service trigger and the IP-based multimedia subsystem domain routing, it performs circuit domain routing addressing for the current called CS domain user, and assigns the CS domain user number to Restore the format of the Uniform Resource Locator from the Session Initiation Protocol to the original circuit domain format, and send it as the called number to the egress gateway control function through the session initiation protocol request message, and the egress gateway control function will route the call to the circuit domain network. 6. The method for providing services for circuit domain users through the packet domain according to claim 3, wherein the circuit user is a called user, and the outgoing signaling path of the circuit user does not enter the IP-based When the multimedia subsystem is used, the method includes the following steps, The circuit domain network judges according to the subscription information of the called circuit domain user whether he has signed up for the Internet Protocol-based multimedia subsystem service, and if so, routes the call to the media gateway control function, and sends the call through the circuit domain network office Inter-signaling indicates that the IP-based multimedia subsystem needs to provide service control for the called user; The media gateway control function judges that the user is a CS domain user and subscribes to an Internet protocol-based multimedia subsystem service according to the CS domain network inter-office signaling, and converts the CS domain user number into a session initiation protocol by querying an electronic encoding server Uniform resource locator format, and then send a session initiation protocol request message to the corresponding called service call session control function, wherein the called user number in the session initiation protocol uniform resource locator format is used; The called service call session control function responds to the session initiation protocol request message from the media gateway control function, obtains the service subscription information of the user through the home user server query method, performs session control on the user's call, and reports to the service corresponding The application server sends a session initiation protocol request message; The application server responds to the session initiation protocol request message from the called service call session control function, obtains the service subscription information of the user through the home user server query method, and performs service control on the user's call, and sends The called service call session control function returns a session initiation protocol request message; The called service call session control function responds to the session initiation protocol request message returned by the called application server, and continues to process the service trigger of the CS domain user or the IP-based multimedia subsystem domain routing session; After the called service call session control function processes the service trigger and the IP-based multimedia subsystem domain routing, it performs circuit domain routing addressing for the current called CS domain user, and assigns the CS domain user number to Restore the format of the session initiation protocol uniform resource locator to the original circuit domain format, and send a session initiation protocol request message to the egress gateway control function as the called number, and the egress gateway control function routes the call to the circuit domain network . 7. The method for providing services for circuit domain users through the packet domain according to any one of claims 4 to 6, wherein the electronic encoding server stores and manages the session initiation protocol uniform resource locator and the The corresponding relation of the CS domain user number provides a mutual query service between the session initiation protocol URL and the CS domain user number. 8. The method for providing services for circuit domain users through the packet domain according to claim 4, characterized in that, in the session initiation protocol request message, the "purpose" parameter in the "call information" header field Extended definition, indicating that the calling user is a circuit domain user and subscribes to the Internet protocol-based multimedia subsystem service; in the calling service call session control function and application server, through the " The processing defined by the "purpose" parameter extension in the "call information" header field determines that the calling user is a circuit domain user and subscribes to the multimedia subsystem service based on the Internet protocol. 9. The method for providing services for CS domain users through the PS domain according to claim 5 or 6, wherein the subscription information includes the CS domain user number information, and the called party passes the subscription The information obtains the CS domain user number, and realizes the routing addressing of the CS domain network after the multimedia subsystem domain based on the Internet protocol has processed the business. 10. The method for providing services for CS domain users through the PS domain according to any one of claims 4 to 6, characterized in that, the home subscriber server stores and manages the subscription information and the CS domain user's Correspondingly, it includes the service subscription information and routing information of the Internet protocol-based multimedia subsystem of the CS domain user. 11. The method for providing services for circuit domain users through the packet domain according to claim 2, characterized in that, the session initiation protocol request message uses the public service identifier as the destination address, and triggers the multimedia subsystem based on the Internet Protocol business. 12. The method for providing services for CS domain users through PS domain according to claim 11, characterized in that, when the CS domain user is a calling user, the method comprises the following steps, The circuit domain network judges according to the subscription information of the circuit domain user that he has signed up for the multimedia subsystem service based on the Internet protocol, routes the call to the media gateway control function, and indicates the need for The IP-based multimedia subsystem provides service control for the calling user; The media gateway control function judges that the user is a circuit domain user and subscribes to an Internet protocol-based multimedia subsystem service according to the inter-office signaling of the circuit domain network, and obtains the corresponding public service identifier according to the subscription information, and then sends the The corresponding service call session control function sends a session initiation protocol request message, which includes the public service identifier; The service call session control function obtains the subscription information corresponding to the public service identifier through a home subscriber server query method, and then sends a session initiation protocol request message to the application server corresponding to the service, which includes the public service identifier; The application server obtains the subscription information corresponding to the public service identifier through the home user server query method, performs service control on the circuit domain user, and returns a session initiation protocol to the service call session control function after processing is completed. request message; After receiving the SIP request message returned by the application server, the service call session control function continues to process service triggering or routing addressing. 13. The method for providing services for CS domain users through the packet domain according to claim 11, wherein when the CS domain user is a called user, and its outgoing signaling path has entered the IP-based When the multimedia subsystem is used, the method also includes the following steps, On the outgoing signaling path, the service call session control function performs routing addressing for the CS domain user, and routes the called party to the egress gateway control function; The egress gateway control function routes the called party to the media gateway control function; The media gateway control function judges whether the called party has processed the service according to the service processing flag of the multimedia subsystem based on the Internet protocol, and if so, routes the called party to the circuit domain network, or judges that the user is a circuit domain network. The domain user subscribes to the Internet protocol-based multimedia subsystem service, and obtains the corresponding public service identifier according to the subscription information, and then sends a session initiation protocol request message to the corresponding service call session control function, which includes using the public service flag, and at the same time set the user's IP-based multimedia subsystem service processing flag; The service call session control function obtains the subscription information corresponding to the public service identifier through a home subscriber server query method, and then sends a session initiation protocol request message to the application server corresponding to the service, which includes the public service identifier; The application server obtains the subscription information corresponding to the public service identifier through the home user server query method, performs service control on the circuit domain user, and returns a session initiation protocol to the service call session control function after processing is completed. request message; After receiving the SIP request message returned by the application server, the service call session control function continues to process service triggering or routing addressing. 14. The method for providing services for circuit domain users through the packet domain according to claim 11, wherein the circuit user is a called user, and the outgoing signaling path of the circuit user does not enter the IP-based The multimedia subsystem comprises the following steps, The circuit domain network judges according to the subscription information of the called circuit domain user that he has signed up for the Internet protocol-based multimedia subsystem service, routes the call to the media gateway control function, and sends the call to the media gateway control function through the circuit domain network interoffice information Instructions related information; The media gateway control function judges that the user is a circuit domain user and subscribes to an Internet protocol-based multimedia subsystem service according to the inter-office signaling of the circuit domain network, and obtains the corresponding public service identifier according to the subscription information, and reports to the corresponding The serving call session control function sends a session initiation protocol request message, which includes the public service identifier; The service call session control function obtains the subscription information corresponding to the public service identifier through a home subscriber server query method, and then sends a session initiation protocol request message to the application server corresponding to the service, which includes the public service identifier; The application server obtains the subscription information corresponding to the public service identifier through the home user server query method, performs service control on the circuit domain user, and returns a session initiation protocol to the service call session control function after processing is completed. request message; After receiving the SIP request message returned by the application server, the service call session control function continues to process service triggering or routing addressing. 15. The method for providing services for circuit domain users through the packet domain according to any one of claims 12 to 14, characterized in that, in the session initiation protocol request message, the public service identifier is used as the destination address identifier Bearer, the CS domain user number of the called user is carried by the message body. 16. The method for providing services for circuit domain users through the packet domain according to any one of claims 12 to 14, wherein the service call session control function and the application server receive the session The circuit domain user number of the called user is obtained from the message body of the request message for initiating the protocol, which is used to realize the routing addressing of the circuit domain network after the multimedia subsystem domain based on the Internet protocol has processed the business; it is also used for the Service control by the application server. 17. The method for providing services for circuit domain users through the packet domain according to any one of claims 12 to 14, characterized in that the subscription information and the public service identification service are stored and managed in the home subscriber server Correspondingly, it includes the subscription data of the public service identification service, the calling or called attribute of the public service identification service; the application server determines whether it is based on the calling or called attribute in the subscription data of the public service identification The calling CS domain user or the called CS domain user provides service control. 18. The method for providing services for circuit domain users through packet domain according to claim 2, further comprising the following steps, the circuit domain network routes all calls to the media gateway control function; The media gateway control function intercepts the call, judges through authentication that the user is a circuit domain user and subscribes to an Internet protocol-based multimedia subsystem service, and if so, triggers an Internet protocol-based multimedia subsystem session; otherwise, the The call is returned to the CS domain network. 19. The method for providing services for circuit domain users through the packet domain according to claim 2, further comprising the following steps, The circuit domain user directly dials the service access code and then dials the called number, the circuit domain network analyzes the service access code, and routes the call to the media gateway control function; The media gateway control function intercepts the call, judges through authentication that the user is a circuit domain user and subscribes to an Internet protocol-based multimedia subsystem service, and if so, triggers an Internet protocol-based multimedia subsystem session; otherwise, the The call is returned to the CS domain network. 20. The method for providing services for CS domain users through the packet domain according to claim 18 or 19, characterized in that when the session initiation protocol request message transmits the relevant information of the CS domain users through the public service identifier, After the media gateway control function determines that the user is a CS domain user and subscribes to an Internet protocol-based multimedia subsystem service, it obtains the corresponding public service identifier according to the service subscription information of the CS domain user. 21. The method for providing services to CS domain users through the packet domain according to claim 4 or 12, wherein in the CS domain network, the originating office switch or the tandem office switch of the CS domain user determines The CS domain user subscribes to the Internet Protocol-based multimedia subsystem service; when the session initiation protocol request message transmits the relevant information of the CS domain user through the public service identifier, the originating office switch or the tandem office The switch combines a specific prefix code according to the service subscription information. 22. The method for providing services for CS domain users through the packet domain according to claim 6 or 14, characterized in that, in the CS domain network, it is determined by the landing office switch or the tandem switch of the CS domain user The CS domain user has signed an Internet Protocol-based multimedia subsystem service; when the session initiation protocol request message transmits the relevant information of the CS domain user through the public service identifier, the landing office switch or the tandem switch according to The service subscription information is combined to form a specific prefix code. 23. The method for providing services for circuit domain users through the packet domain according to any one of claims 4, 6, 12, or 14, characterized in that the fixed network home location register is configured in the circuit domain network, When the call of the circuit domain user passes through the fixed network home location register, it is judged whether the circuit domain user has subscribed to the Internet protocol-based multimedia subsystem service; when the session initiation protocol request message passes the public service identifier The relevant information of the CS domain user is transmitted, and the fixed network home location register combines a specific prefix code according to the service subscription information. 24. The method for providing services to circuit domain users through the packet domain according to any one of claims 4, 6, 12, or 14, wherein the circuit domain network provides the media gateway with a control function When the CSN inter-office signaling sent is the initial address message message of the ISDN user part signaling, the "called user number" parameter of the initial address message message is sent by the CS domain user. The calling number is composed of adding a specific prefix code, which is used to indicate that the CS domain user has subscribed to the Internet protocol-based multimedia subsystem service. 25. The method for providing services for CS domain users through the packet domain according to claim 24, wherein the media gateway control function performs a process on the specific prefix code after receiving the initial address message. Number analysis, judging whether the CS domain user has subscribed to the Internet protocol-based multimedia subsystem service; when the session initiation protocol request message transmits the relevant information of the CS domain user through the public service identifier, the specific prefix code is It is generated by the circuit domain network according to the combination of the Internet protocol-based multimedia subsystem service subscription information of the circuit domain user, and the media gateway control function translates and obtains the public service identifier according to the specific prefix code. 26. The method for providing services for circuit domain users through the packet domain according to claim 24, characterized in that, after the media gateway control function receives the initial address message, it parameter to obtain the called number of the CS domain user. 27. The method for providing services for circuit domain users through the packet domain according to claim 4 or 6, wherein when the media gateway control function routes to the service call session control function, it is set in a data configuration mode Obtain the routing address of the service call session control function from the routing relationship table. 28. The method for providing services for circuit domain users through the packet domain according to any one of claims 4 to 6, 12 to 14, characterized in that the home subscriber server query method comprises the following steps, The query initiator judges whether the information to be queried is local, and if so, directly invokes the local information, otherwise inquires and downloads the information to be queried from the home user server; The query initiator keeps and stores the queried information, and performs aging update; Wherein the query initiator is any one of the service call session control function and the application server.

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