WO2006047964A1

WO2006047964A1 - A method for providing service to a user of cs domain

Info

Publication number: WO2006047964A1
Application number: PCT/CN2005/001873
Authority: WO
Inventors: Youzhu Shi
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2004-11-08
Filing date: 2005-11-08
Publication date: 2006-05-11
Also published as: CN100372342C; CN1773967A

Abstract

A method for providing service to a user of CS domain by PS domain enables fixed network user to access to IMS directly and use IMS services, thereby realizing blending and service reuse of fixed network and mobile network. The present invention makes IMS not only to support interworking with CS domain, but also to provide services to the user of fixed network CS domain by expanding the functions of network nodes such as MGCF, S-CSCF and AS or the like. MGCF can judge whether the user of CS domain which signaling path passes through MGCF can use IMS service, and trigger IMS session; S-CSCF processes session and routing control, and triggers AS according to IMS service subscribing information; AS performs service control and provides IMS service for the user of fixed network CS domain; and also HSS function is expanded for storing and managing IMS subscribing service data related to the users of fixed network CS domain.

Description

A method for providing services to circuit domain users

The present invention relates to a method for converging a packet domain network with a circuit domain network, and more particularly to a method for providing services to circuit domain users in an IP based multimedia subsystem (IMS). BACKGROUND OF THE INVENTION The rapid development of optical communication technologies and broadband Internet Protocol (IP) technologies has enabled communication backbone networks to have strong application support capabilities, and bandwidth is no longer a major difficulty for operators to conduct business. However, from the perspective of the development of the global telecommunications market, the voice and data services market is becoming increasingly saturated, leading operators to face the dilemma of decreasing business growth and increasing difficulties for customers. As a result, both emerging and traditional operators are looking for new market opportunities and business models to create new business growth points and attract more potential users.

Due to the limitations of its circuit switching (CS), the public telephone network limits the development of its business diversity. The public telephone network is basically unable to meet the needs of users' 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 business. Only the public telephone network or the Internet can not meet the comprehensive needs of users' voice, data and images. Operators need a solution that delivers next-generation multimedia services based on next-generation network architecture to create new business growth points.

The existing fixed-circuit circuit domain users provide various services based on Public Switched Telephone Network (PSTN) or Integrated Services Digital Network (ISDN) through digital program-controlled switches and intelligent networks. Smart business. On the one hand, due to the close combination of call control and service control, the service deployment speed is slower and the cost is higher. On the other hand, the digital program-controlled switch and the intelligent network can only provide a simple circuit domain service, and the user's human-computer interaction mode is single. The business experience is poor, and the enthusiasm of users to use the business is not high, which is not conducive to the promotion of the business. With the rapid development of personal mobile communication networks, the growth of mobile networks, and the ultimate unification of IP networks, the development trend of NGN (Next Generation Networks) must be integrated with multiple networks, such as grouping. The fusion of domain and circuit domain, the convergence of mobile network and fixed network. Packet domain and circuit domain convergence is one of the current research hotspots, and the IP-based multimedia subsystem (IMS, IP based Multimedia Subsystem) proposed by the 3rd Generation Partnership Project (3GPP, 3rd Generation Partnership Project) in the R5/R6 standard A system designed specifically for the next generation of all-IP multimedia mobile networks, which focuses on the use of IP networks to carry mobile multimedia services, enabling operators and end users to obtain faster and more flexible applications from the innovation of multimedia services. Increase revenue and profit for operators.

IMS is a target network for 3G mobile networks to implement packet voice and packet data, providing unified multimedia services and applications. Due to the increasingly fierce market competition, existing circuit-switched systems will be phased out, replaced by IP-based hardware systems that are open, scalable, and less expensive to purchase and maintain. The 3GPP system began to gradually shift to an all-IP-based core network. The 3GPP specification also highlights the importance of IP architecture and introduces the concept of IMS. One is to provide traditional circuit-switched services (such as voice services) in the form of IP, and the other is to implement this subsystem to users. All multimedia services provided. IMS is an extension of the packet switched domain (PS, Packet Switching) core network and is designed 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) is used as the call control signaling. In order to establish, maintain and terminate voice and multimedia processes, the three aspects of service management, session control and bearer access are separated. Here are a few examples of IMS multimedia traffic: 1. When a user answers a call, it receives another incoming IP videophone. The user decides not to receive the video call, but ^ ί The Pakistani turned to a message system. The user will then receive a notification that there is a video message in their mailbox. 2. When a user answers a call, he receives another incoming IP videophone. The user decides to answer the new call, but he wants to switch between the two phones. 3. A user is not answering any calls, he is modifying his user settings file to transfer calls from all those who are not high priority and who they don't know. However, in this case the user can still receive all email and text messages, regardless of who sent them to him. Figure 1 shows the framework structure and functional entities of the IMS. The framework structure of the IMS defined by the 3GPP includes a Service Call Session Control Function Unit (CSCF, Call Session Control Function), a Media Gateway Control Function Unit (MGCF, Media Gateway Control Function), and an IMS Media Gateway (IMS - MGW, IMS - Media Gate Way). ), Multimedia Resource Function Controller (MRFC), Multimedia Resource Function Processor (MRFP), Export Gateway Control Function Unit (BGCF, Breakout Gateway Control Function), and IMS Application Server (AS) , Application Server ) and functional entities such as Home Subscriber Server (HSS). CSCF is the core of the entire network and supports SIP sessions for SIP sessions. The CSCF is further divided into an inquiry CSCF (I-CSCF, Interrogating-CSCF) and a service CSCF (S-CSCF, Serving-CSCF). The proxy CSCF (P-CSCF, Proxy CSCF) is the entry point for the user equipment (UE, User Equipment) to access the IMS system, and implements the SIP protocol. Proxy and UserAgent functions in the conference; MGCF and IMS-MGW are functional entities interworking with the CS domain and the PSTN, respectively responsible for control signaling and media stream interworking; MRFC and MRFP are multiparty conferences. Functional entity, the control plane's MRFC controls the MRFP through H.248; the BGCF is the demarcation point between the IMS domain and the external network, which selects the nodes interconnected with the CS domain or the PSTN. In the IMS, the service is uniformly provided by the application server AS, and the session control is completed by the S-CSCF. The two are completely separated in the network structure. The service is triggered by the S-CSCF through the subscription rule to the AS, and multiple ASs can work together. The IMS user accesses the IMS through the visited domain node P-CSCF at the location of the current location. The session and service control are always completed by the home domain node where the subscription is located. The session control and service control functions of the IMS are independent of the access. User subscription information for IMS is centrally managed in the HSS. The IMS implements an 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, IMS services have many advantages. For example, it supports WEB self-service, and users can conduct business self-management and service customization very intuitively, such as custom intelligent routing, ring tones, calling color images, tasks and reminders, distinctive ringing, A variety of services, such as abbreviated number, outgoing call restriction, and incoming call restriction, greatly simplify the procedures for users to sign and register business. In addition, the IMS service can support the business process through a certain control agent terminal (such as WEB Client mode) by clicking on the graphical interface, so that the user can operate the service very intuitively, such as click dialing, click conference, click hold, Clicking on the recovery, click to transfer, click to queue, click to exit, click to connect and other business operations, greatly simplifying the cumbersome steps for users to use the business. In addition, IMS is a core network defined by the 3GPP standard for mobile networks to provide services for mobile users. If the fixed terminal capabilities permit or under certain control and proxy cooperation, the fixed network users are served. Reuse, surplus operator investment, Moreover, it can bring new business growth points for fixed network users, and the benefits are better. Therefore, the IMS-based network convergence solution is the current research hotspot. At present, because IMS has many technical advantages, the European Telecommunications Standards Institute (ETSI, the domain, as the core network of the fixed network NGN, provides services for fixed-access IMS domain users, realizing fixed and mobile networks. Fusion.

However, for the traditional PSTN and ISDN fixed-network domain users, due to technical limitations, IMS can only support call intercommunication between fixed-line circuit domain users and IMS domain users, and cannot provide services for fixed-line circuit domain users through IMS. Because the current fixed-circuit circuit domain users are in the intercommunication call, the call signaling route does not pass through the IMS AS, so the IMS cannot provide services for the fixed-circuit circuit domain users. That is, the current technology does not well support the convergence of the packet domain and the circuit domain.

At present, in order to provide service services to fixed-circuit circuit domain users, the PSTN/ISDN network realizes service access of fixed-line users through digital program-controlled switches and intelligent network nodes. Because the call control and service control functions are completed in the same network node, the solution has poor flexibility, which is not conducive to rapid deployment and expansion of services. A modification of a function may trigger another change in functionality, increasing the potential risk; deployment and expansion of certain services may even cause an upgrade of the entire network node, which is costly and slow to deploy. Moreover, since the digital program-controlled switch and the intelligent network can only provide a simple circuit domain service, the user's human-computer interaction mode is single, and the service experience is poor. The user can only use the service through the dial-up button on the fixed terminal, and set the service. It is necessary to memorize various service codes and even business processes. The enthusiasm of users to use the business is not high, which is not conducive to the promotion of the business. For the IMS system, although the existing IMS provides a mechanism for separating the service management, the session control, and the bearer access, it can provide rich multimedia services based on the packet network, and the IMS network structure also supports the fixed mobile convergence service, but The IMS standard only supports and solid The interworking call of the network circuit domain user does not support the provision of service applications for the fixed circuit domain users. Therefore, when an operator has both an IMS network and a PSTN/ISDN network, it is necessary to repeatedly develop services to provide IMS services to fixed-circuit circuit domain users. In practical applications, the above solution has the following problems: The solution that directly provides the service to the fixed network user through the network node of the circuit domain is costly and slow to deploy, and the user interface is single, which is not conducive to promotion; and the existing IMS network cannot Directly provide IMS services to fixed-circuit circuit domain users, and repeat development of the business to achieve high operating costs.

The main reason for this situation is that the existing fixed-line circuit switching methods are not flexible enough, and the network facilities are expensive; and the IMS network cannot directly provide IMS services to the fixed-circuit circuit domain users. SUMMARY OF THE INVENTION In view of this, the main object of the present invention is to provide a method for providing services for circuit domain users, so that users of fixed network circuit domains can directly access IMS and use IMS services to implement packet domain networks and traditional circuit domain networks. Integration and reuse at the business level. To achieve the above object, the present invention provides a method for providing services for a circuit domain user, which is applicable to a multimedia subsystem IMS based on an internet protocol, and includes the following steps: setting processing rule information of an IMS service for a circuit domain user in an IMS ;

Converting the call of the circuit domain user who has signed the IMS service into the format of the Session Initiation Protocol SIP, and routing the call to the IMS service call conference control function unit CSCF for processing the circuit domain user session;

The CSCF acquires IMS service processing rule information of the current circuit domain user, performs session control according to the service processing rule information, and sends a service processing request to the involved application server AS; The AS receives the service processing request, obtains the service processing rule information of the current circuit domain user, and performs service control on the circuit domain user according to the service processing rule information.

Preferably, the set IMS service processing rule information is distinguished by the SIP identity adopted by the circuit domain user in the IMS. The SIP identifier used by the user of the circuit domain in the IMS is: a SIP Uniform Resource Locator URL, or a SIP Uniform Resource Identifier URI.

When the circuit domain user is a calling user, the method specifically includes:

A1. The circuit domain network routes the call of the circuit domain user who subscribed to the IMS service to the media gateway control function unit MGCF of the IMS, and the MGCF converts the number of the circuit domain user into a SIP identity format, and translates the call into a SIP request message. ;

Bl, and sent to the CSCF for processing the circuit domain user session, the SIP request message carrying indication information indicating that the calling user is a circuit domain user and signing an IMS service;

C1, the CSCF determines, according to the indication information of the SIP request message from the MGCF, that the user is a circuit domain user and subscribes to the IMS service, acquires the IMS service processing rule information of the calling user, and the calling party according to the obtained information. The user's call is controlled to send a SIP request message to the service-related AS, where the indication information indicating that the calling user is a circuit domain user and the IMS service is contracted is included;

D1, the AS determines, according to the indication information in the SIP request message from the CSCF, that the user is a circuit domain user and subscribes to an IMS service, and obtains service processing rule information of the calling user, according to the obtained information. The call of the calling user performs service control, and returns a SIP request message to the CSCF after the processing is completed;

El. The CSCF completes the SIP request message returned by the AS related to the service and completes the addressing of the called route.

In the SIP request message, the user is indicated as a circuit domain user by signing an extension field of a "destination" parameter in a "call information" header field; and the IMS service is contracted; And the AS determines that the calling user is a circuit domain user and subscribes to the IMS service by processing the "destination" parameter extension field in the "call information" header field in the received SIP request message.

When the circuit domain user is the called user and the outgoing signaling path has entered the IMS, the method specifically includes:

A2. The calling CSCF receives the SIP request message on the outgoing signaling path, performs routing addressing on the called user, and converts the called user number into a SIP identity format for processing the called user. The called CSCF of the session routes and sends the SIP request message, where the called user is identified by using a SIP identity format;

B2, the called CSCF obtains the subscription information of the called user, and sends a SIP request message to the called AS according to the obtained information according to the obtained information;

C2, the called AS obtains the subscription information of the called user, performs service control on the called user according to the obtained information, and returns a SIP request message to the called CSCF after the processing is completed;

D2, the called CSCF receives a SIP request message returned by the called AS after all the services, and then performs a subsequent routing session; in the routing session, if the called user does not change due to the above service control, the called party The subscriber number is restored from the SIP identity format to the original circuit domain format and sent as the called number to the egress gateway control function unit BGCF or MGCF via the SIP request message, and the BGCF or MGCF routes the call to the circuit domain network.

When the circuit user is the called user and the outgoing signaling path does not enter the IMS, the method specifically includes:

A1. The circuit domain network routes the call of the circuit domain user who subscribed to the IMS service to the MGCF of the IMS, and the MGCF converts the number of the circuit domain user into a SIP identity format, and translates the call into a SIP request message;

B3, sending the SIP request message to a CSCF for processing the circuit domain user session; B3. The CSCF receives the SIP request message from the MGCF, acquires the IMS service processing rule information of the called user, controls the call of the called user according to the obtained information, and sends a SIP request message to the service-related AS. ;

C3. The AS receives the SIP request message from the called CSCF, acquires the IMS service processing rule information of the called user, and performs service control on the called user's call according to the obtained information. The called CSCF returns a SIP request message;

D3, the called CSCF receives a SIP request message returned by the called AS after all the services, and then performs a subsequent routing session; when the routing session is changed, if the called user does not change due to the foregoing service control, the called party is called The subscriber number is restored from the SIP identity format to the circuit domain format and sent as a called number to the egress BGCF or MGCF, and the BGCF or MGCF routes the call to the circuit domain network.

The step A1 specifically includes:

The circuit domain network determines, according to the preset IMS service subscription information, that the circuit domain user subscribes to the IMS service, and routes the circuit domain user's call to the MGCF in the IMS through the circuit domain network inter-office signaling, and in the letter Instructing the user to be a circuit domain user and signing an IMS service;

Determining, by the MGCF, that the user is a circuit domain user and signing an IMS service according to the inter-office signaling of the circuit domain network, converting the number of the circuit domain user into a SIP identity format, and using the circuit domain network inter-office letter Translate the call into a SIP request message.

In the circuit domain network, the IMS service subscription information is preset in the switch of the circuit domain user belonging to the exchange, and the switch determines that the circuit domain user has subscribed to the IMS service.

The IMS service subscription information is preset in a fixed network home location register configured in the circuit domain network, and when the circuit domain user's call passes through the fixed network home location register, it is determined that the circuit domain user has signed up. IMS business. The circuit domain network inter-office signaling sent by the circuit domain network to the MGCF is a start address message IAM of the integrated service data network user part signaling, and the "called user number" parameter of the message is used by the circuit The domain user called number is added with a specific prefix code, which is used to indicate that the user is a circuit domain user and subscribes to the IMS service; the MGCF determines the location according to the specific prefix code of the "called user number" in the start address message. The user is a circuit domain user and has signed an IMS service.

The step A1 specifically includes:

The circuit domain network routes calls of all circuit domain users directly to the MGCF of the IMS;

The MGCF determines, according to the preset IMS service subscription information, whether the circuit domain user subscribes to the IMS service, and then converts the circuit domain user number into a SIP identity format, and translates the circuit domain network interoffice signaling call into SIP request message.

The step A1 specifically includes:

The circuit domain user adds a service access code before the called number when calling, and the circuit domain network analyzes the service access code in the call, and routes the call to the MGCF;

The MGCF determines, according to the preset IMS service registration information, whether the circuit domain user registers the IMS service, and then converts the circuit domain user number into a SIP identity format, and translates the circuit domain network interoffice signaling call into SIP request message.

The specific manner of converting the number of the circuit domain user into the SIP identifier format is: pre-storing and managing the correspondence between the SIP identifier and the circuit domain user number in an electronic encoding server, and querying the electronic encoder to circuit The domain user's number is converted to the SIP identity format.

The specific method for restoring the called subscriber number from the SIP identity format to the circuit domain format is: including the circuit domain number information of the circuit domain user in the set IMS service processing rule information, where the CSCF obtains The IMS service processing rule information recovers the circuit domain format number of the called user. The set IMS service processing rule information is distinguished by the public service identifier PSI. When the circuit domain user is a calling user, the method specifically includes:

Al. The circuit domain network routes the call of the circuit domain user that subscribes to the IMS service to the MGCF of the IMS, and the MGCF generates a PSI corresponding to the IMS service subscribed by the circuit domain user, and translates the call into a SIP request message and sends the call to a CSCF for processing the circuit domain user session, where the PSI and the called number are carried;

Bl, the CSCF receives the SIP request message, obtains the IMS service processing rule information corresponding to the PSI, and sends a SIP request message to the service-related AS according to the obtained information, where the PSI is included;

Cl, the AS receives the SIP request message, obtains the IMS service processing rule information corresponding to the PSI, performs service control on the circuit domain user according to the obtained information, and returns a SIP request message to the CSCF after the processing is completed;

Dl. After receiving the SIP request message returned by the AS related to all services, the CSCF completes addressing the called route.

A2, on the outgoing signaling path, the CSCF will route the SIP request message of the called user to the MGCF;

The MGCF receives the SIP request message, and determines that the called user is a circuit domain user and subscribes to the IMS service according to the preset IMS service subscription information, and obtains a corresponding PSI according to the IMS service subscription information, and then uses the corresponding PSI. The called CSCF that processes the called user session sends a SIP request message, where the PSI and the called number are included;

C2, the called CSCF receives the SIP request message, obtains the IMS service processing rule information corresponding to the PSI, and sends a SIP request message to the service-related AS according to the obtained information, where the PSI is included; D2, the AS receives the SIP request message, obtains the IMS service processing rule information corresponding to the PSI, performs service control on the called user according to the obtained information, and returns a SIP request message to the CSCF after the processing is completed. ;

E2: After receiving the SIP request message returned by the AS related to all services, the called CSCF routes the called number.

The method further includes:

An IMS service processing flag is set in the MGCF to indicate whether the called party has processed the IMS service. After receiving the SIP request message, the MGCF determines, according to the IMS service processing flag, whether the called party has processed the service, and if so, Then, the called party is routed to the circuit domain network. Otherwise, if the user is determined to be a circuit domain user and the IMS service is contracted, the subsequent steps are performed, and the IMS service processing flag of the user is set.

The circuit user is a called user, and the outgoing signaling path does not enter the IMS, and the method specifically includes:

B3, the CSCF receives the SIP request message, obtains the IMS service processing rule information corresponding to the PSI, and sends a SIP request message to the service-related AS according to the obtained information, where the PSI is included;

C3, the AS receives the SIP request message, obtains the IMS service processing rule information corresponding to the PSI, performs service control on the called user according to the captured information, and returns a SIP request message to the CSCF after the processing is completed. ;

D3. After receiving the SIP request message returned by all service-related ASs, the CSCF performs routing addressing on the called number. The step a1 specifically includes:

The circuit domain network determines that the circuit domain user has subscribed to the IMS service according to the preset IMS service subscription information, and combines a specific indication information according to the IMS service subscription information corresponding to the user, and sends the information to the MGCF through an IAM message. ;

The MGCF determines that the user is a circuit domain user and subscribes to the IMS service according to the specific indication information, and translates the specific indication information into a corresponding PSI, and translates the call into a SIP request message. The CSCF is sent, which includes the PSI and the called number.

The specific indication information combined is a specific service prefix code, which is added before the "called number" parameter in the IAM message.

In the circuit domain network, the IMS service subscription information is preset in the switch of the circuit domain user home switching office, and the switch determines that the circuit domain user subscribes to the IMS service, and the switch only The IMS service subscription information corresponding to the user combines the specific indication information.

The IMS service subscription information is preset in a fixed network home location register configured in the circuit domain network, and when the circuit domain user's call passes through the fixed network home location register, it is determined that the circuit domain user has signed up. The IMS service, and the specific indication information is combined by the fixed network home location register according to the IMS service subscription information corresponding to the user.

The step al specifically includes:

The MGCF determines, according to the preset IMS service subscription information, whether the circuit domain user subscribes to the IMS service, and then combines the corresponding PSI according to the IMS service subscription information corresponding to the user, and translates the call into a SIP request message to the The CSCF sends, including the PSI and the called number.

The step a1 specifically includes: The circuit domain user adds a service access code before the called number, and the circuit domain network analyzes the service access code in the call, and routes the call to the MGCF;

The IMS service processing rule information is set in the home subscriber server HSS of the IMS, and the device in the IMS obtains the IMS service subscription information from the HSS.

The obtaining the IMS service processing rule information from the HSS specifically includes: the acquiring party locally queries the IMS service processing rule information to be obtained locally, and if the information is locally, directly obtains the local information, otherwise, the HSS is queried. And downloading the IMS service processing rule information, and permanently storing or temporarily storing the downloaded IMS service processing rule information.

By comparison, it can be found that the technical solution of the present invention is different from the prior art in that the IMS supports not only the intercommunication call with the fixed network circuit domain but also the extension of the functions of the network nodes such as the MGCF, the S-CSCF, and the AS. The service can be provided by the IMS for the fixed-circuit circuit domain user; wherein, the MGCF can determine whether the user of the fixed-circuit circuit domain of the MGCF through the MGCF subscribes to the IMS service, and triggers the IMS session, and the S-CSCF processes the session and the route control, according to the IMS service. The contract information triggers the AS, and the AS controls the service of the fixed network domain user to provide the IMS service. The HSS function is also extended to store and manage the IMS subscription service data related to the fixed network domain user.

The difference in the technical solution brings about a more obvious beneficial effect, that is, the IMS is used to provide services for the users of the fixed-circuit circuit domain, and the service is independent of the network, which greatly accelerates service deployment and expansion, and greatly reduces the cost of service customization; IMS also brings users of fixed-circuit circuit domains A new business experience, improved user interface, user-friendly operation, increased user enthusiasm, and new business growth points for operators; at the same time, the reuse and integration of fixed and mobile networks in the business, reducing operating costs. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a frame structure and functional entities of an IMS;

2(a) is a flowchart of processing for providing an IMS service to a subscriber of a fixed network circuit domain when the calling party is in the first embodiment;

FIG. 2(b) is a flowchart showing a process of providing an IMS service to a fixed network circuit domain user when the user is called and the outgoing path enters the IMS domain according to the first embodiment;

FIG. 2(c) is a flowchart of a process for providing a IMS service to a fixed network circuit domain user when the user is called and the outgoing path does not enter the IMS domain according to the first embodiment;

FIG. 3(a) is a flowchart of processing for providing an IMS service to a user of a fixed network circuit domain when the calling party is in the second embodiment;

FIG. 3(b) is a flowchart of processing for providing an IMS service to a fixed network circuit domain user when the user is called and the outgoing path enters the IMS domain according to the second embodiment;

Figure 3 (c) is a flow chart showing the processing of the IMS service provided by the fixed network circuit domain of the second embodiment when the user is called and the outgoing path does not enter the IMS domain.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be further described in detail below with reference to the accompanying drawings.

The core technical solution of the present invention is: A method for providing services to circuit domain users, suitable For the IMS system, comprising: setting processing rule information of the IMS service for the circuit domain user in the IMS; converting the call of the circuit domain user who has signed the IMS service into a SIP format, and routing the call to the IMS for processing the a CSCF of a circuit domain user session; the CSCF acquires IMS service processing rule information of a current circuit domain user, performs session control according to the service processing rule information, and sends a service processing request to the AS involved; the AS accepts a service processing request, Obtaining service processing rule information of the current circuit domain user, and performing service control on the circuit domain user according to the service processing rule information.

The invention provides a session flow and related processing method for the IMS to provide services for the users of the fixed network circuit domain according to the framework of the fixed network circuit domain and the IMS interconnection and the IMS session processing specification. In the present invention, the user of the fixed network circuit domain may be identified by the SIP identifier in the IMS domain, or may be identified by the Public Service Identity (PSI) of the IMS service subscription information; the SIP identifier may be a SIP unified resource. The Locator URL (Universal Resource Locator) or the Unicode (Universal Resource Identifier); the IMS service processing rule information corresponding to the user or the PSI is stored in the HSS and managed by the HSS for other units to query and download. Whether the fixed network subscriber subscribes to the IMS service is judged by the PSTN network node and then forwarded to the MGCF, or directly forwarded to the MGCF for judgment. After the service request enters the IMS domain or passes through the IMS domain, the MGCF or the S-CSCF determines the triggering session, and routes the session to the AS corresponding to the service according to the subscription information. The AS performs service control on the fixed network user to provide IMS. business. After the service is finished, it can be routed back to the PSTN by the BGCF/MGCF to end the processing of the IMS domain. During the whole process, the session of the IMS domain satisfies the SIP protocol, but the SIP request information needs to carry the necessary call related information, or the related information is included in the subscription information. This enables IMS to directly access and provide IMS services for fixed-circuit domain users.

In order to describe the essence of the invention in more detail, feasible embodiments in various cases are given below. In the first embodiment of the present invention, the fixed network user is identified in the IMS domain by using the SIP UL or SIP URI, and the IMS service processing procedure is triggered by the user. The present invention uses the SIP URI to identify the fixed network user as an example, and the present invention uses the SIP URI to identify the fixed network user. In the case of the user's calling and called in the fixed network domain, the access processing flow is shown in Figure 2, respectively. FIG. 2( a ) is a flowchart of processing for providing an IMS service when a user of the fixed network circuit domain is called by the first embodiment; FIG. 2( b ) is a called by the user of the fixed network domain in the first embodiment. And the flow chart of the IMS service is provided when the outgoing path enters the IMS domain; FIG. 2(c) is the IMS service provided when the user of the fixed network circuit domain is called and the outgoing path does not enter the IMS domain according to the first embodiment. Process flow chart. The flow of the three cases in the first embodiment will be specifically described below.

Referring to FIG. 2(a), the processing flow for providing the IMS service when the user of the fixed network circuit domain is called by the first embodiment includes:

Step 211: The fixed network domain user, that is, the fixed UE initiates a dialing call to the PSTN.

Step 212: The PSTN determines, according to the pre-stored service subscription information of the calling user, whether the calling user subscribes to the IMS service, and if yes, routes the call to the MGCF, and sends an indication flag to the MGCF, indicating that the call is not interworking. Call, but a IMS service call that requires IMS to provide service control for the calling user; otherwise, it processes according to the existing processing flow.

In this embodiment, the indication flag is transmitted to the MGCF by using PSTN inter-office signaling. There are various types of inter-office signaling in the PSTN. In the preferred embodiment of the present invention, an IAM (Initial Address Message) in the ISDN User Part (ISUP) part signaling may be used. To describe and pass the indicator. The IAM message indicates that the call is initiated by the fixed network user and the IMS service is contracted. As a preferred embodiment, the IMS service can be indicated by adding a specific prefix code to the called user number in the IAM message to indicate that the calling user is a fixed network user and subscribes to the IMS service. Control System.

Step 213: After receiving the IAM message, the MGCF performs number analysis on the "called user number" in the message, and determines that the calling user subscribes to the IMS service according to the specific prefix code, and deletes the prefix code to obtain the real Call the user PSTN number. Since the user identifiers in the IMS network are in the SIP URI format, and the user numbers in the PSTN are represented by the E.164 format, the MGCF needs to use the electronic code server (ENUM Server, Electronic Numbering Server) to request the calling party number from the E. The .164 format is translated into a SIP URI format. Here, the ENUM Server needs to pre-store the corresponding conversion relationship for managing the SIP URI of the fixed-circuit domain user number field.

Step 214: The ENUM Server translates the calling party number from the E.164 format into a SIP URI format by querying the conversion relationship, and returns the translation result to the MGCF.

Step 215: The MGCF translates the IAM message into a SIP request (INVITE) message (the method of translation is a well-known technique), and the calling address in the INVITE message adopts the translated SIP URI format; and the calling party is indicated in the INVITE message. The user is a fixed circuit domain user and signs an indication of the IMS service. In this embodiment, the indication flag can be extended by using the extension of the "purpose" parameter in the additional information of the calling user or the called user provided by the "Call-Info" header field of the INVITE message. To identify. The MGCF sends the INVITE message to the S-CSCFL that handles the caller session control. The S-CSCF1 represents the S-CSCF that handles the caller session control, that is, the caller S-CSCF; and the S-CSCF2 handles the called session control. S-CSCF, called the S-CSCF.

Step 216: After receiving the INVITE message, the S-CSCF1 processes the session control of the calling user. The difference between the processing and the prior art is: determining that the calling user is based on the value of the dedicated parameter of the Call-Info header field in the INVITE message. The user of the fixed-circuit circuit domain subscribes to the IMS service, and then queries the service processing rule information of the user locally. If the information does not exist locally, the HSS is requested to download; and then the IMS is triggered according to the service processing rule information of the user. AS1, AS1 indicates that the service is controlled by the calling party, that is, the calling AS; AS2 indicates that the called party performs service control, that is, the called AS, and the S-CSCF1 sends an INVITE message to the AS1, and the message still indicates the main The user is called a fixed network domain user and has signed an IMS service.

In the present invention, a user may sign a plurality of IMS services, and the information is recorded in the service processing rule information of the user as part of the contracting rule, and the S-CSCF1 processes the contract according to the contracting rules, for example, signing three AS services, and having In order, the corresponding ASs can be triggered in sequence.

In the present invention, the method for the S-CSCF to request the HSS to download the service processing rule information may be one of the following manners: In the first mode, the S-CSCF does not store the downloaded service processing rule information, that is, the session is released. The service processing rule information is deleted in the future, and will be re-downloaded each time a new call is made; the second method is to permanently store the service processing rule information obtained by the download, and further query whether the local service storage rule information is stored before each call. If there is no HSS download, the service processing rule information is retained after the session is released. The third method uses the data aging update mechanism to save the service processing rule information for a period of time, if a certain threshold is exceeded (such as If there is no related call for more than 24 hours, delete the locally saved service processing rule information, and further query whether the local service processing rule information is stored before each call, if not to go to the HSS download. The processing method for the above S-CSCF to request the HSS to download the service processing rule information is also applicable to other network processing nodes in the present invention, such as nodes such as S-CSCF2, IMS AS1, and IMS AS2.

Step 217: When the IMS AS 1 receives the INVITE message, according to the value of the purpose parameter of the Call-Info header field in the message, it is determined whether the calling user is a fixed network domain user and subscribes to the IMS service, and the local user is queried locally. The service processing rule information, if the information does not exist locally, request the download to the HSS; and then perform the phase according to the user service processing rule information. The service control (which is specifically performed under the scope of the present invention) is processed, and the INVITE message is sent to the S-CSCF1.

Step 218: The S-CSCF1 receives the INVITE message, and continues to trigger the service of the calling user or route the called user according to the service subscription rule in the service processing rule information of the user. At this time, if the service contracting rule further describes that a new AS service needs to be triggered, the new AS is continuously triggered, and an INVITE message is sent to the new AS, and the message still indicates that the calling user is a fixed network domain user and signs the contract. The IMS service returns to step 217; if there is no new AS service, the S-CSCF1 completes the subsequent route addressing function to the called user.

FIG. 2(a) is a flowchart of providing an IMS service for a fixed network circuit domain user in the first embodiment. When the user of the fixed network domain is called, the process of providing the IMS service is divided into two cases: The first type, when calling in a fixed network domain user, the incoming call requires the IMS to provide the called user with a certain Service application control, and the first half of the call, that is, the outgoing signaling path has entered the IMS, the service of the calling user is completed, and the IMS routes the called user in the fixed network domain; the second type, incoming call For a fixed-circuit circuit domain user, the incoming call requires the IMS to provide some service application control for the called user, and the first half of the call, that is, the outgoing signaling path does not pass through the IMS.

Referring to FIG. 2(b), the fixed network circuit domain user in the first embodiment is called and the outgoing path is provided with an IMS service processing flow when entering the IMS domain. The process includes:

Step 221: The S-CSCF1 receives the INVITE message of the outgoing path entering the IMS domain, and performs routing addressing on the called user in the fixed network domain. The called address is in the E.164 format, and then requests the ENUM Server to the called user number. The E.164 format is translated into a SIP URI format.

Step 222: The ENUM Server translates the called user number from the E.164 format into a SIP URI format by using a configuration query, and returns the translation result to the S-CSCF1.

Step 223: The S-CSCF1 obtains the called subscriber number in the SIP URI format, and sends an INVITE message to the S-CSCF2 in the called home domain, where the called address in the message is translated. SIP URI format. The route addressing method of S-CSCF1 to S-CSCF2 is completely the same as that defined by the 3GPP IMS standard, and the present invention will not be described.

Step 224: The S-CSCF2 receives the INVITE message and processes the session control of the called user. The difference between the processing and the prior art is: querying the service processing rule information of the called user locally, and requesting the HSS if not queried. The IMS AS2 is triggered by the service contracting rule in the user service processing rule information, and the S-CSCF2 sends an INVITE message to the IMS AS2, and the AS2 provides related service application control for the called user.

Step 225: The IMS AS2 receives the INVITE message, and locally queries the service processing rule information of the called user. If no query is found, the IMS AS2 requests the HSS to download. Then, according to the user service processing rule information, the corresponding application service control is performed. The S-CSCF2 sends an INVITE message.

Step 226: The S-CSCF2 receives the INVITE message from the AS2, and continues to perform service triggering or routing addressing on the called user according to the service subscription rule in the user service processing rule information. At this time, if the service contracting rule further describes that a new AS service needs to be triggered, the new AS is continuously triggered, and the INVITE message is sent to the new AS. The new AS receives the INVITE message, and returns to step 225; if there is no new AS service, Then S-CSCF2 addresses the current called user route.

When S-CSCF2 routes the current called user, if the called user does not change due to the service control of the AS, S-CSCF2 re-acquires the PSTN number of the called user in E.164 format, and the called user is called. The PSTN number is sent to the BGCF as the called address in the INVITE message, and proceeds to step 227; if the PSTN number of the called user is not re-acquired, the S-CSCF2 continues to use the URI of the currently called user for routing in the IMS domain. Address, and the called user is actually located in the circuit domain causing the route to fail. If the called user changes due to the business control of the AS, it is processed according to the existing process.

In the present invention, the S-CSCF2 reacquires the PSTN number of the called user in the E.164 format. There are various types, for example, setting a valid "circuit domain routing number" in the subscription information of the called user, the valid "circuit domain routing number", consisting of "specific prefix code" + "PSTN number of the called user", The "specific prefix code" indicates that the S-CSCF2 does not need to request the ENUM Server to translate the called number in the E.164 format, and directly uses the called user's PSTN number for routing; in addition, the ENUM Server can also be requested to translate into The called number in E.164 format. .

Step 227: After receiving the INVITE message, the BGCF routes the call to the PSTN, and the process is defined by the 3GPP IMS standard. The called user continues to be addressed by the PSTN.

Referring to FIG. 2(c), the processing flow for providing the IMS service when the user of the fixed network circuit domain is called and the outgoing path does not enter the IMS domain is described in the first embodiment. The process includes:

Step 231: Incoming a user of a fixed network circuit domain, the PSTN receives the incoming IAM message, and determines whether the called user subscribes to the IMS service according to the pre-stored called user subscription information, and then the PSTN sends an IAM message to the MGCF, and Indicates that the called user has subscribed to the IMS service. Otherwise, it processes according to the existing IMS processing flow.

In this embodiment, when the PSTN sends an IAM message to the MGCF, the IMS service may be instructed by the USER service by adding a specific prefix code to the called user number in the I AM message. It provides business control.

Step 232: The MGCF receives the IAM message, performs number analysis on the called user number in the message, and determines that the called user subscribes to the IMS service according to the specific prefix code, and deletes the prefix code to obtain the real called party. User PSTN number. The MGCF requests the ENUM Server to translate the called number from the E.164 format to the SIP URI format.

Step 233: The ENUM Server translates the called user number from the E.164 format into a SIP URI format through a configuration query, and returns the translation result to the MGCF.

Step 234: The MGCF translates the IAM message into a SIP INVITE message, and the called address in the INVITE message is in a translated SIP URI format.

Step 235: The S-CSCF2 receives the INVITE message, and processes the session control of the called user. Specifically, the IMS AS2 is queried by the local service provider, and if the information does not exist locally, the HSS is requested to download, and then the IMS AS2 is triggered according to the service subscription rule in the called user service processing rule information, and the AS2 is The user is requested to provide related service application control, and the S-CSCF2 sends an INVITE message to the AS2.

Step 236: The IMS AS2 receives the INVITE message, and locally queries the subscription information of the called user. If it does not exist, it requests the HSS to download, and then performs corresponding service control according to the service processing rule information of the user, and the processing is completed and sent to the S-CSCF2. INVITE message.

Step 237: The S-CSCF2 receives the INVITE message from the AS, and continues to perform service triggering or routing addressing on the called user according to the service subscription rule in the user service processing rule information. At this time, if the service contracting rule further describes that a new AS service needs to be triggered, the new AS is triggered to send an INVITE message to the new AS, and the new AS receives the INVITE message, and returns to step 236. If there is no new AS service, S-CSCF2 addresses the current called user route.

When S-CSCF2 routes the current called user, if the called user does not change due to the service control of the AS, S-CSCF2 re-acquires the PSTN number of the called user in E.164 format, and the called user is called. The PSTN number is sent to the BGCF as the called address in the INVITE message, and proceeds to step 238; if the PSTN number of the called user is not re-acquired, the S-CSCF2 continues to use the current called user's UI for routing in the IMS domain. Address, and the called user is actually located in the circuit domain causing the route to fail. If the called user changes due to the business control of the AS, it is processed according to the existing process.

Step 238: After receiving the INVITE message, the BGCF routes the call to the PSTN, and the process is defined by the 3GPP IMS standard. The called user continues to be addressed by the PSTN.

In the foregoing first embodiment, when the MGCF routes the call to the S-CSCF, the MGCF may select an S-CSCF to perform routing by means of data configuration, such as directly specifying one or a certain type of user in the configuration data. S-CSCF; In addition, the MGCF can also call First routed to the I-CSCF, the I-CSCF obtains an S-CSCF address according to the method defined by the 3GPP IMS standard, and the I-CSCF then routes the call to the S-CSCF.

In the above-mentioned first embodiment, the PSTN determines the IMS subscription feature of the user and notifies the MGCF by using a specific prefix code. The MGCF performs a number analysis on the prefix code to determine that the user has subscribed to the IMS service, and then requests the ENUM Server to be the master. The PSTN number in the E.164 format called the user or the called user is translated into the SIP URI format. Another solution is: PSTN does not make a judgment. The PSTN directly routes the user's call to the MGCF unconditionally. The MGCF pre-stores the subscription information and provides a user authentication processing function to intercept the call, that is, the current user is judged according to the pre-stored subscription information. Whether to sign the IMS service, if the user subscribes to the IMS service, the MGCF requests the ENUM Server to translate the PSTN number of the E.164 format of the calling or called user into the SIP URI format; if there is no contracted IMS service, the MGCF returns the call. To PSTN.

In the above-mentioned first embodiment, the user of the fixed network circuit domain 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, routes the call to the MGCF, and provides the user profile by the MGCF. The right processing is to intercept the call by function. If the user subscribes to the IMS service, the MGCF requests the ENUM Server to translate the PSTN number of the E.164 format of the calling or called user into the SIP URI format; if there is no contracted IMS service, the MGCF Return the call to the PSTN.

In the embodiment of the SIP URI identification, a significant difference between the calling fixed network domain user and the called fixed network domain user in the IMS domain call flow is: S-CSCF1 needs to determine that the current session's calling party is a fixed network circuit domain. The user also subscribes to the IMS service, and if the user service processing rule information does not exist locally, the HSS download is requested, which is an extension of the 3GPP IMS standard definition process; and the S-CSCF2 only needs to find the called service processing rule information. If the local does not exist, you can request the HSS download, which is in line with the 3GPP IMS standard definition process. The use of PSI for IMS service triggering can enable the IMS subscription service for the fixed-line circuit domain of the calling party. The download process of the rule processing information is also in accordance with the definition of the 3GPP IMS standard.

In the second embodiment of the present invention, the IMS service is provided for the fixed network user by using the PSI identifier, and the IMS service processing procedure is triggered by the PSI. In the case of the user's calling and called in the fixed network domain, the access processing flow is shown in Figure 3. FIG. 3( a ) is a flowchart of processing for providing an IMS service when a user of the fixed network circuit domain is called by the second embodiment; FIG. 3( b ) is a called by the user of the fixed network domain in the second embodiment. And the processing flow chart for providing the IMS service when the outgoing path enters the IMS domain; FIG. 3(c) is a process for the IMS service provided by the fixed network circuit domain user of the second embodiment when the called party does not enter the IMS domain. flow chart. The flow of the three cases in the second embodiment will be specifically described below.

Referring to FIG. 3 (a), the processing flow for providing the IMS service when the user of the fixed network circuit domain is called by the second embodiment includes:

Step 311: The user of the fixed network circuit domain initiates a dialing call to the PSTN.

Step 312: The PSTN determines, according to the pre-stored subscription information of the calling user, whether the primary user subscribes to the IMS service. If the IMS service is contracted, the specific service prefix code is combined according to the IMS service subscription information of the calling user. And add the service prefix code in front of the parameter "called user number" in the IAM message, and send the IAM message to the MGCF; if there is no contracted IMS service, it is processed according to the existing process.

Step 313: The MGCF receives the IAM message, performs number analysis on the "called user number" in the message, determines, according to the specific service prefix code, that the calling user subscribes to the IMS service, and translates the service prefix code into a corresponding correspondence. PSI (this PSI is used to identify the service type in the IMS domain), and delete the prefix code to get the real called user PSTN number; MGCF translates the IAM message into a SIP INVITE message, and fills the PSI into the INVITE according to the IMS standard definition In the To header field/Request-URI request line of the message; fill the called user PSTN number into an area in the INVITE message, such as the message body carried by the INVITE message; send the INVITE message to the S-CSCF2. Here, MGCF gets S-CSCF2 The method of routing addresses is defined in accordance with the 3GPP IMS standard.

Step 314: The S-CSCF2 receives the INVITE message, and locally queries the service processing rule information corresponding to the PSI. If the information does not exist locally, the HSS is requested to download. Then, according to the subscription rule in the service processing rule information, an IMS is triggered. AS2. S-CSCF2 sends an INVITE message to AS2.

Step 315: The AS2 receives the INVITE message, takes the called user number from the message, and queries the service processing rule information corresponding to the PSI locally. If the information does not exist locally, the HSS requests the download; where the service processing rule information is used. Indicates that the service is a service for the calling party, and the AS2 then performs corresponding service control on the calling user according to the service processing rule information, and the processing is completed, and the INVITE message is sent to the S-CSCF2.

Step 316: The S-CSCF2 receives the INVITE message from the AS2, and continues to perform service triggering or routing addressing on the PSI according to the service subscription rule in the service processing rule information corresponding to the PSI. If the service contracting rule further describes that there is a new AS service, If triggered, the new service AS is triggered, and the S-CSCF2 sends an INVITE message to the newly triggered AS, and returns to step 315. If the route is addressed, the S-CSCF2 retrieves the current called address from the message for addressing.

FIG. 3(a) is a flowchart of providing an IMS service for a fixed network circuit domain user in the second embodiment. When the user of the fixed network domain is called, the process of providing the IMS service is divided into two cases: The first type, when calling in a fixed network domain user, the incoming call requires the IMS to provide the called user with a certain Service application control, and the first half of the call, that is, the outgoing signaling path has entered the IMS, the service of the calling user is completed, and the IMS routes the called user in the fixed network domain; the second type, incoming call For a fixed-circuit circuit domain user, the incoming call requires the IMS to provide some service application control for the called user, and the first half of the call, that is, the outgoing signaling path does not pass through the IMS.

Referring to FIG. 3(b), a process flow for providing a IMS service when a user of the fixed network circuit domain is called and the outgoing path enters the IMS domain according to the second embodiment. The process includes: Step 321: The S-CSCF receives the INVITE message, and performs routing addressing on the called user in the fixed network circuit domain. The called address is in the E.164 format, and the ENUM Server requests the translation failure, and the S-CSCF routes the session to the BGCF. In the second embodiment, the ENUM Server does not pre-store the corresponding conversion relationship for managing the SIP URI of the fixed-circuit domain user number field, and thus the translation fails.

Step 322: The BGCF routes the INVITE message of the session to the MGCF.

The MGCF further includes an IMS service processing flag for indicating whether the called user has handled the IMS service.

Step 323: The MGCF receives the INVITE message, and determines, according to the IMS service processing flag, whether the called user in the fixed network circuit domain has processed the IMS service. If the IMS service has not been processed, the IMS service subscription information is pre-stored according to the pre-stored user IMS service subscription information. The user is called to perform service authentication. If the called user subscribes to the IMS service, the MGCF combines a specific PSI according to its specific service subscription information. The PSI is filled in the INVITE message according to the IMS standard definition, for example, filled in here. In the To header field/Request-URI request line of the message, the called user PSTN number is filled in other areas of the message; the INVITE message is sent to the S-CSCF2, and the MGCF obtains the S-CSCF2 routing address in the same way as the 3GPP IMS standard. Definition; At the same time, the MGCF sets the IMS service processing flag of whether the called user has processed the IMS service to indicate that the IMS service has been processed. If the called user does not subscribe to the IMS service or has already processed the IMS service, the MGCF routes the call to the PSTN.

Step 324: The S-CSCF2 receives the INVITE message, and locally queries the service processing rule information corresponding to the PSI in the To header field/Request-URI request line. If the information does not exist locally, the HSS requests the download, and then obtains the information according to the obtained The contract processing rule in the service processing rule information triggers an IMS AS2. S-CSCF2 sends an INVITE message to AS2.

Step 325: The AS2 receives the INVITE message, and takes out the called user number from the message, and locally queries the service processing rule information corresponding to the PSI. If the subscription information does not exist locally, Then, the HSS is requested to download, and then according to the service processing rule information (in this service processing rule information, it can be specified that the called service is triggered), the called user is subjected to corresponding service control, and after the processing is completed, the INVITE message is sent to the S-CSCF2. .

Step 326: The S-CSCF2 receives the INVITE message from the AS2, and continues to perform service triggering or routing addressing on the PSI according to the service subscription rule in the service processing rule information corresponding to the PSI. At this time, if the service contracting rule further describes that a new AS service needs to be triggered, the new service AS is continuously triggered, and the S-CSCF2 sends an INVITE message to the newly triggered AS, and returns to step 325; if it is route addressing, S-CSCF2 The current called address is retrieved from the message body for addressing routing.

Referring to FIG. 3(c), the process of providing the IMS service when the user of the fixed network circuit domain is called and the outgoing path does not enter the IMS domain is described in the second embodiment. The process includes:

Step 331: Incoming a user of a fixed network circuit domain, the PSTN receives the incoming IAM message, and determines whether the called user subscribes to the IMS service according to the pre-stored subscription information of the called user, and is based on the IMS service of the called user. The subscription information combines a specific service prefix code, and 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.

Step 332: The MGCF receives the IAM message, performs number analysis on the "called user number" in the message, determines that the called user subscribes to the IMS service according to the specific service prefix code, and translates the service prefix code into a corresponding correspondence. PSI, and delete the prefix code to get the real called user PSTN number; MGCF translates the IAM message into an INVITE message, and fills the PSI into the INVITE message according to the IMS standard definition, for example, the To header field of the message is filled in here. The /Request-URI is in the request line, and the called user PSTN number is filled in other areas of the message; the MGCF sends the INVITE message to the S-CSCF2. The method by which the MGCF obtains the S-CSCF2 routing address is the same as that defined by the 3GPP IMS standard.

Step 333: The S-CSCF2 receives the INVITE message, and locally queries the industry corresponding to the PSI. The service rule information is: if the service processing rule information does not exist locally, the HSS is requested to download; then, according to the contracting rule in the obtained service processing rule information, an IMS AS2 is triggered; the S-CSCF2 sends an INVITE message to the AS2.

Step 334: The AS2 receives the INVITE message, and the called user number is retrieved from the message, and the service processing rule information corresponding to the PSI is locally queried. If the information does not exist locally, the HSS is requested to download. Here, the service processing rule information is used. Indicates that the call triggers the called service. AS2 performs corresponding service control on the called user. After the processing is completed, the INVITE message is sent to the S-CSCF2.

Step 335: The S-CSCF2 receives the INVITE message from the AS, and continues to perform service triggering or route addressing on the PSI according to the service contracting rule in the PSI corresponding service processing rule information. At this time, if the service contracting rule further describes that a new AS service needs to be triggered, the new service AS is continuously triggered, and the S-CSCF2 sends an INVITE message to the newly triggered AS, and returns to step 334; if there is no new AS service, The S-CSCF2 fetches the current called address from the message body for addressing routing.

In the above second embodiment, the IMS subscription feature of the user can be judged by the PSTN and a service prefix code is combined to notify the MGCF by the message, and the MGCF translates the service prefix code into the PSI. Another solution may be: PSTN does not make a judgment, PSTN directly routes the user's call to the MGCF unconditionally, the MGCF pre-stores the subscription information, and provides a user authentication processing function to intercept the call. If the user subscribes to the IMS service, the MGCF provides The specific service subscription information directly combines the corresponding PSI according to the service subscription information; if the user does not subscribe to the IMS service, the MGCF returns the call to the PSTN.

In the foregoing second embodiment, the user of the fixed network circuit domain 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, routes the call to the MGCF, and the MGCF pre-stores the subscription. Information, and provide user authentication processing function to intercept the call. If the user signs the IMS service, the MGCF provides specific service subscription information. The corresponding PSI is directly combined according to the service subscription information; if there is no contracted IMS service, the MGCF returns the call to the PSTN.

In the above solution of the present invention, the network node that determines that the calling user is the IMS subscription user in the PSTN may be the originating office or the gateway switch of the calling user; the PSTN determines that the called user is the network of the IMS subscription user. The node can be the landed office or the gateway switch of the called user. In addition, a home location register ("HLR") may be configured in the PSTN network. When the call passes through the HLR, the HLR determines whether the call has subscribed to the IMS service.

In addition, the service processing rule information stored and managed in the HSS in the present invention corresponds to the PSI service, and includes the PSI service subscription information, a calling or called attribute of the PSI service. The AS determines, according to the calling or called attribute in the subscription information of the PSI, that the service control is provided for the calling circuit domain user or the called circuit domain user.

Although the present invention has been illustrated and described with reference to the preferred embodiments of the present invention, those skilled in the art The spirit and scope of the invention is defined by the appended claims.

Claims

Claim

A method for providing services to circuit domain users, which is applicable to an Internet Protocol-based multimedia subsystem IMS, which is characterized in that it comprises the following steps:

Setting processing rule information of the IMS service for the circuit domain user in the IMS;

The CSCF acquires IMS service processing rule information of the current circuit domain user, performs session control according to the service processing rule information, and sends a service processing request to the involved application server AS;

The AS receives the service processing request, obtains the service processing rule information of the current circuit domain user, and performs service control on the circuit domain user according to the service processing rule information.

2. The method for providing services to a circuit domain user according to claim 1, wherein the set IMS service processing rule information is distinguished by a SIP identifier used by the circuit domain user in the IMS.

The method for providing a service to a circuit domain user according to claim 2, wherein the SIP identifier used by the circuit domain user in the IMS is: a SIP uniform resource locator URL, or a SIP uniform resource identifier URL.

The method for providing a service to a circuit domain user according to claim 3, wherein when the circuit domain user is a calling user, the method specifically includes:

Bl, and sent to the CSCF for processing the circuit domain user session, the SIP request cancellation The information carries indication information indicating that the calling user is a circuit domain user and has signed an IMS service;

5. The method for providing a service to a circuit domain user according to claim 4, wherein in the SIP request message, the extension field of the "destination" parameter in the "call information" header field is used to indicate The user is a circuit domain user and subscribes to the IMS service; the CSCF and the AS determine that the calling user is a circuit by processing the "destination" parameter extension field in the "call information" header field in the received SIP request message. Domain users and sign up for IMS services.

The method for providing a service to a circuit domain user according to claim 3, wherein when the circuit domain user is a called user and the outgoing signaling path has entered the IMS, the method specifically includes: :

A2. The calling CSCF receives the SIP request message on the outgoing signaling path, performs routing addressing on the called user, and converts the called user number into a SIP identity format for processing the called user. The called CSCF of the session routes and sends the SIP request message, where the called user is identified by using a SIP identity format; B2, the called CSCF obtains the subscription information of the called user, and sends a SIP request message to the called AS according to the obtained information according to the obtained information;

D2, the called CSCF receives all the service-related called. The SIP request message returned by the AS performs a subsequent routing session; when the routing session is changed, if the called user does not change due to the above service control, the called CSCF The calling user number is restored from the SIP identity format to the original circuit domain format, and is sent as the called number to the egress gateway control function unit BGCF or MGCF through the SIP request message, and the BGCF or MGCF routes the call to the circuit domain network. .

The method for providing a service to a circuit domain user according to claim 3, wherein when the circuit user is a called user and the outgoing signaling path does not enter the IMS, the method specifically includes:

B3, sending the SIP request message to a CSCF for processing the circuit domain user session;

B3. The CSCF receives the SIP request message from the MGCF, acquires the IMS service processing rule information of the called user, controls the call of the called user according to the obtained information, and sends a SIP request message to the service-related AS. ;

C3. The AS receives the SIP request message from the called CSCF. The IMS service processing rule information of the called user is obtained, and the call of the called user is controlled according to the obtained information. After the processing is completed, Returning a SIP request message to the called CSCF;

D3. The called CSCF receives a SIP request returned by the called AS of all services. After the message, the subsequent routing session is performed; when the called user does not change due to the above service control, the called user number is restored from the SIP identification format to the circuit domain format, and is sent as the called number. The SIP request message is sent to the egress BGCF or MGCF, and the BGCF or MGCF routes the call to the circuit domain network.

The method for providing a service to a circuit domain user according to claim 4 or 7, wherein the step A1 specifically includes:

The method for providing services to a circuit domain user according to claim 8, wherein in the circuit domain network, the IMS service subscription information is preset in a switch of the circuit domain user home switching office, The switch determines that the circuit domain user has subscribed to the IMS service.

The method for providing services to a circuit domain user according to claim 8, wherein the IMS service subscription information is preset in a fixed network home location register configured in a circuit domain network, and the circuit domain user When the call passes through the fixed network home location register, it is determined that the circuit domain user has subscribed to the IMS service.

The method for providing services to a circuit domain user according to claim 8, wherein the circuit domain network inter-office signaling sent by the circuit domain network to the MGCF is a partial part of an integrated service data network user. The start address message IAM of the order, the "called user number" parameter of the message is composed of the circuit domain user called number added with a specific prefix code, used to indicate The user is a circuit domain user and subscribes to the IMS service; the MGCF determines that the user is a circuit domain user and subscribes to the IMS service according to the specific prefix code of the "called user number" in the start address message.

The method for providing a service to a circuit domain user according to any one of claims 4 to 7, wherein the specific manner of converting the number of the circuit domain user into the SIP identity format is: The server pre-stores and manages the correspondence between the SIP identifier and the circuit domain user number, and queries the electronic encoder to convert the circuit domain user number into a SIP identifier format.

The method for providing services for a circuit domain user according to claim 6 or 7, wherein the specific method for restoring the called subscriber number from the SIP identity format to the circuit domain format is: in the set IMS The service processing rule information includes circuit domain number information of the circuit domain user, and the CSCF recovers by using the acquired IMS service processing rule information. The circuit domain format number of the called user.

16. The method for providing a service to a circuit domain user according to claim 1, wherein the set IMS service processing rule information is distinguished by a public service identifier PSI.

The method for providing a service to a circuit domain user according to claim 16, wherein when the circuit domain user is a calling user, the method specifically includes:

The method for providing a service to a circuit domain user according to claim 16, wherein when the circuit domain user is a called user and the outgoing signaling path has entered the IMS, the method specifically includes :

The MGCF receives the SIP request message, and determines that the called user is a circuit domain user and subscribes to the IMS service according to the preset IMS service subscription information, and obtains a corresponding PSI according to the IMS service subscription information, and then uses the corresponding PSI. Called to handle the called user session The CSCF sends a SIP request message, which includes the PSI and the called number;

C2, the called CSCF receives the SIP request message, obtains the IMS service processing rule information corresponding to the PSI, and sends a SIP request message to the service-related AS according to the obtained information, where the PSI is included;

D2, the AS receives the SIP request message, obtains the IMS service processing rule information corresponding to the PSI, performs service control on the called user according to the obtained information, and returns a SIP request message to the CSCF after the processing is completed. ;

The method for providing a service to a circuit domain user according to claim 18, wherein the method further comprises:

An IMS service processing flag is set in the MGCF to indicate whether the called party has processed the IMS service. After the MGCF receives the SIP request message, the IMS service processing flag determines whether the called party has processed the service. If yes, Then, the called party is routed to the circuit domain network. Otherwise, if the user is determined to be a circuit domain user and the IMS service is contracted, the subsequent steps are performed, and the IMS service processing flag of the user is set.

The method for providing a service to a circuit domain user according to claim 16, wherein the circuit user is a called user, and the outgoing signaling path does not enter the IMS, and the method specifically includes: :

B3, the CSCF receives the SIP request message, acquires IMS service processing rule information corresponding to the PSI, and sends a SIP request to the service-related AS according to the obtained information. Interest, which includes the PSI;

C3, the AS receives the SIP request message, obtains the IMS service processing rule information corresponding to the PSI, performs industry control on the called user according to the obtained information, and returns a SIP request message to the CSCF after the processing is completed;

D3. After receiving the SIP request message returned by the AS related to all services, the CSCF routes the called number.

The method for providing a service to a circuit domain user according to claim 17 or 20, wherein the step a1 specifically includes:

The circuit domain network determines, according to the preset IMS service subscription information, that the circuit domain user subscribes to the IMS service, and the IMS service subscription information corresponding to the user combines a specific indication information, and sends the information to the MGCF through an IAM message. ;

Determining, by the MGCF, that the user is a circuit domain user and signing an IMS service according to the specific indication information, and translating the specific indication information into a corresponding PSI, and translating the call into a SIP request message to the The CSCF sends, which contains the PSI and the called number.

22. The method for providing a service to a circuit domain user according to claim 21, wherein the combined specific indication information is a specific service prefix code, and the "called number" parameter is added to the IAM message. The front.

The method for providing services to a circuit domain user according to claim 21, wherein in the circuit domain network, the IMS service subscription information is preset in a switch of the circuit domain user home switching office, The switch determines that the circuit domain user subscribes to the IMS service, and the switch combines the specific indication information according to the IMS service subscription information corresponding to the user.

The method for providing services for a circuit domain user according to claim 21, wherein the IMS service subscription information presets a fixed network home position configured in a circuit domain network. In the register, when the call of the circuit domain user passes through the fixed network home location register, it is determined that the circuit domain user subscribes to the IMS service, and the fixed network home location register is based on the IMS service corresponding to the user. The subscription information combines the specific indication information.

The circuit domain user adds a service access code before the called number, and the circuit domain network analyzes the service access code in the call, and routes the call to the MGCF;

The method for providing services for a circuit domain user according to any one of claims 1 to 7, 16 to 20, wherein the IMS service processing rule information is set in an IMS home subscriber server HSS, the IMS The device in the device obtains the IMS service subscription information from the HSS.

The method for providing a service to a circuit domain user according to claim 27, wherein the obtaining the IMS service processing rule information from the HSS specifically includes: the acquiring party locally querying the IMS service to be acquired Processing rule information, if this If the information is available, the local information is directly obtained. Otherwise, the IMS service processing rule information is queried and downloaded to the HSS, and the downloaded IMS service processing rule information is permanently stored or temporarily stored.