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

A method for providing service to a user of cs domain Download PDF

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Publication number
WO2006047964A1
WO2006047964A1 PCT/CN2005/001873 CN2005001873W WO2006047964A1 WO 2006047964 A1 WO2006047964 A1 WO 2006047964A1 CN 2005001873 W CN2005001873 W CN 2005001873W WO 2006047964 A1 WO2006047964 A1 WO 2006047964A1
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WO
WIPO (PCT)
Prior art keywords
user
ims
service
domain
called
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PCT/CN2005/001873
Other languages
French (fr)
Chinese (zh)
Inventor
Youzhu Shi
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority to CN 200410094548 priority Critical patent/CN100372342C/en
Priority to CN200410094548.3 priority
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2006047964A1 publication Critical patent/WO2006047964A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q3/00Selecting arrangements
    • H04Q3/0016Arrangements providing connection between exchanges
    • H04Q3/0025Provisions for signalling

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 of providing service for the CS domain user TECHNICAL FIELD

The present invention relates to a packet domain network and the circuit domain network convergence, and more particularly to a method (IMS) service is provided in circuit domain based on the IP Multimedia Subsystem users. Background of the Invention optical communication technology and broadband Internet Protocol (IP, Internet Protocol) The rapid development of technology, making communication backbone network already has a strong ability to support applications, the bandwidth is no longer a major difficulty operators doing business. But from the point of view of the development of the global telecommunications market, voice and data services market increasingly saturated, resulting in operators facing business growth began to decline every year, more and more difficult predicament customer development. Therefore, whether new operators or traditional operators are looking for new market opportunities and business models, and thus for the creation of new business growth and attract more potential users.

Public telephone networks due to the limitations of its circuit-switched (CS, Circuit Switching), limiting the diversity of its business development for mobile business users, personalized services and multimedia business needs of the public telephone network simply can not meet. At the same time, computer technology and network technology innovation has changed the needs of users of services, only the public telephone network or the Internet can not satisfy user demand for integrated voice, data and images. Operators need a next-generation network architecture to provide next-generation solutions for multimedia services, to create new business growth.

The existing fixed-line circuit to provide a variety of domain users based public switched telephone network (PSTN, Public Switched Telephone Network) or Integrated Services Digital Network (ISDN, Integrated Services Digital Network) services through digital program-controlled switches and intelligent network and smart business. On the one hand, due to the close connection with call control and service control, service deployment so slow, high cost; on the other hand, digital program-controlled switches and intelligent network can only provide a simple circuit domain service, single user human-computer interaction , poor service experience, business users are not enthusiastic, is not conducive to the promotion of business. With the rapid development of personal mobile communication networks, mobile networks grew, and IP network will eventually dominate the world in the context of the development trend of fixed-line Next Generation Network (NGN, Next Generation Networks) must be the integration with a variety of networks, such as packet fusion domain and the CS domain, the mobile and fixed networks of fusion. Packet domain or the circuit domain fusion is one of research focus, wherein the third generation mobile communication Partnership Project (3GPP, 3rd Generation Partnership Project) in the R5 / R6 standard proposed IP-based multimedia subsystem (IMS, IP based Multimedia Subsystem ) that is designed for the next generation all-IP mobile network design multimedia system that focuses on IP bearer for the mobile multimedia service network with the operators and end-users for more rapid and more flexible application of the innovative multimedia services, thereby increase revenue for operators, to create profits.

IMS is a 3G mobile network implementing the packet voice and packet data, the target network to provide uniform multimedia services and applications. Because of the increasingly fierce market competition, the existing circuit-switched system will be phased out and replaced by an open, scalable, acquisition and maintenance costs more affordable IP-based hardware systems. 3GPP system then gradually move to a full IP-based core network. 3GPP specifications are increasingly highlighted the importance of IP infrastructure and introduces the concept of IMS, one hopes to provide traditional circuit-switched services (such as voice service) in the form of IP, the second is to hope to achieve by this user subsystem All multimedia services offered. IMS is a packet switched domain (PS, Packet Switching) extended a core network, intended to separate the PS core network. Using the IP packet domain as control signaling and media transmission bearer channel using Session Initiation Protocol (SIP, Session Initiation Protocol) as the call control signaling to establish, maintain and terminate the voice and multimedia processes, to achieve the business management, session three separate control and bearer access. IMS multimedia traffic are given below a few examples: 1. When a user all the way to answer the phone, and receive another incoming IP video phone, the user decides to not answer the videophone, but ^ ί it is transferred to a message bus system. Subsequently, the user will receive a video message in their mailbox notification. 2. When a user all the way to answer the phone, and receive another incoming IP video phone, the user decides to answer the new phone, but he hopes he can switch between the two calls. 3. In a user did not receive any calls, he modify their own user settings file to all of those who are not high priority and they do not know calls are transferred elsewhere. However, in this case the user can still receive all e-mail and text messages, e-mail and information regardless of who sent him. FIG 1 shows a frame structure and IMS functional entities. The frame structure of IMS defined by 3GPP comprises a Serving Call Session Control Function (CSCF, Call Session Control Function), Media Gateway Control Function (MGCF, Media Gateway Control Function), IMS Media Gateway (IMS - MGW, IMS - Media Gate Way ), multimedia resource function controller (MRFC, multimedia resource function controller), a multimedia resource function processor (MRFP, multimedia resource function processor), Breakout gateway control function (BGCF, Breakout gateway control function), and IMS application server (AS , Application server) and Home Subscriber server (HSS, Home Subscriber server) and other functional entities. CSCF which is the core of the network, supporting SIP session using the SIP protocol processing. CSCF divided into inquiry CSCF (I-CSCF, Interrogating-CSCF), and serving CSCF (S-CSCF, Serving-CSCF). Proxy CSCF (P-CSCF, Proxy CSCF) is a user equipment (UE, User Equipment) access to the inlet of the IMS system, realized in the SIP proxy (Proxy) and a user agent (UserAgent) function; the MGCF and IMS - MGW is a functional entity CS domain and PSTN interworking, are responsible for controlling the exchange signaling and media streams; MRFC and MRFP are functional entities to achieve multi-party conference, the control plane through H.248 control MRFC MRFP; BGCF the IMS domain and external cut-off point of the network, it selects a node with the CS domain or PSTN interconnection. In IMS, a unified service provided by the application server AS, session control performed by S-CSCF, the two are completely separated on the network architecture, traffic triggered by S-CSCF to the AS through the subscription rule processing, among a plurality of AS may work together. IMS user through a current location visited domain position of the node P-CSCF to access the IMS, session, and total service control node by the home domain completed subscription location, session control and service control function of the access independent IMS. IMS user subscription information concentrated in the HSS management. The MGCF and IMS interworking call fixed circuit implemented by a media gateway control domain nodes: can call each other i.e. the IMS domain user and the fixed network domain user circuit. Compared to other business, IMS business has many advantages, such as its support for self-WEB, users can conduct business very intuitive self-management and service customization, such as customized intelligent routing, ring tones, caller-color images, tasks and reminders, distinctive ringing, abbreviated numbers, outgoing call restrictions, barring of incoming calls and other services, greatly simplifying the business user subscription and registration procedures. Addition, IMS provides some control traffic may support via a proxy terminal (e.g., WEB Client mode), to control traffic flow by clicking on the graphical interface such that the user can operate very intuitive operations, such as click to call, click to conference, held click, click restore, click the transfer, click the queue, click exit, click turn on other business operations, which greatly simplifies the tedious user using the service procedure. Addition, IMS provides the 3GPP standard is defined as a core mobile network provides service to mobile users, if in the case of a fixed terminal or by the ability to allow some control In the case of agents with, for fixed user services, and equipment reuse, savings operators to invest, but also bring new business growth fixed-line users, better efficiency, and therefore IMS-based network convergence solution is current research focus. Currently, due to the IMS has many technical advantages, the European Telecommunications Standards Institute (ETSI, domain as a standard fixed-line NGN core network, IMS provides services for domain users via fixed access, to achieve the fixed and mobile networks integration.

But the traditional PSTN and ISDN fixed network CS domain user, the current due to technical limitations, only support IMS interworking call between the fixed network CS user and an IMS domain user, and can not provide service for fixed IMS CS user, because the current users in the fixed-line circuit domain interworking call, call signaling route the aS without IMS, the IMS can not provide services for the fixed network domain user circuit. Ie, the current technology does not adequately support the convergence of packet and circuit domains domain.

In order to provide a fixed current CS domain user traffic service, PSTN / ISDN networks fixed user access via digital PBX services and intelligent network node. Since the program call control and service control functions done in the same network node, inflexible and not conducive to the rapid deployment and expansion of the business. Modify a function may lead to change another function, increasing the potential risks; deploy and expand business even cause some to upgrade the entire network nodes, high cost, slow deployment. Further, since the digital program-controlled switches and intelligent network can offer a simple circuit domain service, the user of a single human-computer interaction, the service experience is poor, the user can use the service by dialing a key way on the fixed terminal, provided services, the user need to remember a variety of business code or even business process, business users are not enthusiastic, is not conducive to the promotion of business. For IMS system, while existing IMS provides service management, session control mechanism for three separate bearer access and can provide rich multimedia services a packet-based network and the IMS network architecture also supports fixed-mobile convergence service, but IMS supports only standard domain users and fixed network exchange call circuit, does not provide support for the fixed-line business applications CS user. When the operator also has the IMS network and PSTN / ISDN networks, development operations need to be repeated in order to provide IMS services to a user circuit fixed network domain. In practical applications, the presence of the above-described embodiment the following problems: high fixed network users directly supplied to the circuit domain through the network node traffic program cost, slow deployment, and a single user interface, is not conducive to the promotion; through the existing IMS network can not directly to the fixed network domain IMS service user circuit, repeated development operations so that costly operations.

The main reason for this situation is that the existing fixed-line circuit-switched inflexible, costly network facilities; IMS and IMS network can not provide fixed-line services directly to the user domain circuit. SUMMARY OF THE INVENTION Accordingly, the main object of the present invention is to provide a method for providing a service for the CS domain user, so that the fixed network CS domain user can directly access the IMS, using the IMS services, and a packet domain network and the traditional circuit domain network the operational level of integration and reuse. To achieve the above object, the present invention provides a method of providing a service for the CS domain user, suitable for use on Internet Protocol multimedia subsystem IMS, comprising the steps of: processing rule setting circuit domain IMS service to a user in the IMS information ;

The subscription services of IMS domain user circuit call into a format of a Session Initiation Protocol SIP, the call is routed to the IMS call session processing service for the CS domain user session control function CSCF unit;

The IMS CSCF obtaining information of the current service processing rules circuit domain user, session control processing rule according to the service information, sends a service processing request to the application server AS involved; AS receiving the service processing request, acquires the current CS user business process rule information, the service control circuit domain user according to the service information processing rule.

Preferably, IMS service processing rules set distinguished by the information identifying the SIP CS domain user in the IMS employed. The CS domain user in the IMS uses SIP identified as: SIP Uniform Resource Locator URL, and a is a SIP uniform resource identifier URI.

When the calling subscriber CS domain user, the method comprises:

A1, a circuit domain network subscription services call routing IMS CS domain user to the IMS-Media Gateway Control Function MGCF, MGCF said circuit domain user identification number into a SIP format, translates the SIP call request message ;

BL, and sent to the CSCF for processing the CS domain user session, the SIP request message carries the calling user to indicate the user is a circuit domain and IMS subscription information indication service;

C1, the CSCF determines that the information message indicating that the user is a CS user and an IMS service subscription, the IMS service processing rules acquired information of the calling user according to the SIP request from the MGCF according to the acquired information for the calling user's call control, service-related aS sends the SIP request message contains information indicating the calling user and a CS user IMS subscription information indication service;

D1, the information message indicating the AS determines that the user is a CS user and an IMS subscription service, the service processing rules acquired information of the calling user according to the SIP request from the CSCF, according to the information obtained the calling subscriber call service control, after processing returns a SIP request message to the CSCF;

El, the CSCF receives the called address complete routing request message related to the service AS returns all of SIP.

In the SIP request message, through the extension field of the "object" parameter "call information" field of the header to indicate that the user is a CS user and an IMS subscription service; AS through the CSCF and receiving of process "object" parameter in the message extension fields "call information" header field of the SIP request, determining caller user and a circuit domain IMS service subscription.

When the CS domain user and the called user exhales into the signaling path has IMS, the method comprises:

A2, calling on the CSCF receives a SIP signaling path exhalation request message, the called user address, the called user identification number into a SIP format, for processing the called subscriber to the routing session called CSCF and transmits the SIP request message, wherein the SIP identifier of the called user identification format;

B2, obtaining the called CSCF of the called user subscription information, the information acquisition request message to the service associated with the called SIP AS sends According;

C2, by obtaining the called AS subscription information of the called user according to the acquired information of the called user service control, after processing to the called CSCF returns a SIP request message;

D2, the called CSCF receives a subsequent request message routing session after all related to the service of the called party returns the SIP AS; in routing the session, if the called user does not change because of the above-described control operations, the called party is a user identification number from a SIP format to recover the original format of the circuit domain, as the called number and transmits the request message to the BGCF Breakout gateway control function or MGCF unit via SIP, the MGCF or the BGCF route the call to the circuit domain network.

When the called user and the user circuit which outgoing signaling path does not enter the IMS, the method comprises:

Call routing A1, the circuit domain network subscribes to an IMS service circuit domain user to the IMS MGCF, MGCF the circuit domain user identification number into a SIP format, translates the SIP call request message;

B3, sending the SIP request message to the CS user session CSCF for processing; B3, the CSCF receives a SIP request message from the MGCF, IMS service processing rules acquired information of the called user according to the obtained information of the called user's call control, service-related AS sends the SIP request message;

C3, the AS receives a SIP request from the called CSCF message, the IMS service processing rules acquired information of the called user, the service control information of the called user according to the acquired call, the post-processed the CSCF returns a SIP request message to the called party;

D3, the called CSCF receives a subsequent request message routing session after all related to the service of the called party returns the SIP AS; in routing the session, if the called user does not change because of the above-described control operations, the called party is a user identification number from a SIP format to recover the circuit domain format, and transmits the SIP request message to the BGCF outlet or as a called number MGCF, BGCF by this route the call to the MGCF or the circuit domain network.

Said step A1 comprises:

IMS subscription of the circuit domain network service according to the IMS service subscription information preset by the user of the circuit domain, the domain user call via a circuit domain network inter-exchange signaling circuit routing to MGCF of the IMS, and the letter the user instructed the CS user and an IMS subscription service;

Analyzing the MGCF according to the inter-office signaling circuit domain network that the user subscribes to the CS user and an IMS service, the circuit domain user identification number into a SIP format, the inter-channel circuit domain network Board SIP call request so translated message.

In the circuit domain network, the IMS service subscription information preset in said circuit switch domain user's home exchange, it is determined that the user subscribes to the CS domain to the IMS services by the switch.

The IMS service subscription information of the default configuration is fixed in the circuit domain network home location register, a user domain when the circuit through the fixed network call home location register determines that the CS domain by a user subscribes IMS services. Inter-domain network of the circuit of the circuit domain network Board sends to the MGCF signaling is integrated services digital network user part initial address message signaling IAM, "Called Party Number" parameter of the message by said circuit add specific user domain called number prefix and is used for indicating the user-CS user and an IMS subscription service; MGCF according to the start address of the message "called party number" is judged as a specific prefix code said user subscribes to the CS domain and IMS service user.

Said step A1 comprises:

All the circuit domain network CS domain user route the call directly to the IMS the MGCF;

MGCF default subscription information judging whether the IMS service the user subscribes to the CS domain IMS service, the domain user is the circuit identification number is converted to a SIP format, the inter-exchange signaling circuit domain network call translated SIP request message.

Said step A1 comprises:

Adding service access code before the called number when a call to the CS user, after the circuit domain network service access code to analyze the call, routing the call to the MGCF said;

MGCF according to a preset IMS service registration information to determine whether said circuit domain user registered IMS service, the domain user is the circuit identification number is converted to a SIP format, the inter-exchange signaling circuit domain network call translated SIP request message.

The circuit converts the domain user identification number of the SIP is formatted DETAILED DESCRIPTION: In an electronic code stored in the server in advance manages the SIP identifier and the correspondence relationship between the circuit domain user number, by querying the electronic encoder circuit domain user identification number into a SIP format.

The specific method to recover from the called subscriber number identifying the format for the SIP format for the circuit domain: domain number information comprising CS domain user in the IMS service to the circuit information processing rule in the set, acquired by the CSCF IMS traffic handling policy of the called user information recovery circuit domain format number. IMS service information processing rule set distinguished by the Public Service Identity PSI. When the calling subscriber CS domain user, the method comprises:

Al, said circuit domain network will route the call sign of the circuit domain user to the IMS-IMS service MGCF, MGCF generates a domain user service circuit corresponding to a PSI IMS subscription, the call is translated and sent to a SIP request message CSCF for processing the CS domain user session, wherein said carrying PSI and a called number;

BL, the CSCF receives the SIP request message to obtain the IMS service processing rule information corresponding to PSI, according to the acquired information related to the service AS sends a SIP request message, wherein the PSI contains;

cl, the AS receives the SIP request message to obtain the IMS service processing rule information corresponding to PSI, the service control domain circuit according to the user information acquired, after processing returns a SIP request message to the CSCF;

DL, the CSCF receives all traffic related to AS returns a SIP request message, the called address complete routing.

When the CS domain user and the called user exhales into the signaling path has IMS, the method comprises:

a2, on the outgoing call signaling path, CSCF of the called user will be routed to the MGCF SIP request message;

b2, the MGCF receives a SIP request message, IMS subscription information according to a preset service determines that the called subscriber is a CS user and an IMS subscription service, subscription service information according to the IMS to give the corresponding the PSI, and then Into processing the called user to the called CSCF sends the SIP session request message comprising the called number and using said PSI;

c2, the called CSCF receives the SIP request message to obtain the IMS service processing rule information corresponding to PSI, sends a SIP request message to the service information acquired related to the AS, wherein the PSI contains; D2, the said AS receives the SIP request message to obtain the IMS service processing rule information corresponding to PSI, the service control of the called user according to the acquired information, after processing returns a SIP request message to the CSCF;

e2, the called CSCF upon receipt of all business related AS returns a SIP request message, the called number is routing addressing.

The method further comprising:

In the MGCF is provided for indicating whether the called IMS service processing flag processed IMS service, the MGCF after receiving the SIP request message, according to the IMS service processing flag determines whether the called service has been treated, if so, then the called route network to the CS domain, or the user determines that the user is a CS domain and an IMS subscription service, the subsequent steps while the user's IMS service processing flag is set.

Said circuit is a user of the called user, and which does not enter the path of the outgoing signaling the IMS, the method comprises:

Al, said circuit domain network will route the call sign of the circuit domain user to the IMS-IMS service MGCF, MGCF generates a domain user service circuit corresponding to a PSI IMS subscription, the call is translated and sent to a SIP request message CSCF for processing the CS domain user session, wherein said carrying PSI and a called number;

b3, the CSCF receives the SIP request message to obtain the IMS service processing rule information corresponding to PSI, according to the acquired information related to the service AS sends a SIP request message, wherein the PSI contains;

c3, the AS receives the SIP request message to obtain the IMS service processing rules corresponding to the PSI information, service control information of the called user according to Di taken, after processing returns a SIP request message to the CSCF ;

d3, the CSCF upon receipt of all business related AS returns a SIP request message, the called number is routing addressing. Said step al comprises:

Said circuit domain network determines that the user subscribes to the CS domain IMS service, according to the user subscription information corresponding to a combination of a specific IMS service indication information sent to the MGCF through an IAM message according to a preset IMS service subscription information ;

The MGCF ^ according to the specific indication information determines that the user is a CS user and an IMS subscription service, and the specific indication information corresponding to the PSI is translated, translates the SIP call request message to the said CSCF sends, wherein the PSI and a called number comprising.

Specific information indicating a combination of a specific service prefix code, preceded by the IAM message parameter "called number."

In the circuit domain network, the IMS service subscription information preset in said circuit switch domain user's home exchange, it is determined that the user subscribes to the CS domain to the IMS service from the switch by the switch according to the Gen only IMS user service subscription information corresponding to a combination of the specific indication information.

The IMS service subscription information of the default configuration is fixed in the circuit domain network home location register, a user domain when the circuit through the fixed network call home location register determines that the CS domain by a user subscribes IMS service, the home location register by the fixed network subscription information of a composition according to the specific indication information corresponding to the user's IMS service.

Said step al comprises:

All the circuit domain network CS domain user route the call directly to the IMS the MGCF;

MGCF default subscription information judging whether the IMS service the user subscribes to the CS domain IMS service, if yes, according to the user subscription information corresponding to a combination of an IMS service corresponding to the PSI, translates the SIP call request message to the CSCF sends, including PSI and the called number.

Said step al comprises: the CS domain user service access code plus a call before the called number, and the circuit domain of the analyzed network service access code after the call and routes the call to the said the MGCF;

MGCF default subscription information judging whether the IMS service the user subscribes to the CS domain IMS service, if yes, according to the user subscription information corresponding to a combination of an IMS service corresponding to the PSI, translates the SIP call request message to the CSCF sends, including PSI and the called number.

The IMS service processing rule information provided at the IMS Home Subscriber Server HSS in the IMS, the apparatus acquires from the HSS in the IMS service subscription information.

The processing rule acquiring the IMS service information from the HSS comprises: the IMS service information acquirer processing rule local query to be acquired, if the information is available locally, directly obtain local information, or to query the HSS and downloading the IMS service processing rule information, and download the IMS service processing rule information permanently stored or temporarily stored.

Can be found by comparing the difference aspect of the present invention and the prior art that the present invention is by extension of the MGCF, S-CSCF, AS and other functions of the network node, so that not only support the IMS and CS domain interworking fixed network calls, further may be provided by the IMS user service for fixed circuit domain; wherein, MGCF signaling path can be determined through the fixed network domain user circuit MGCF whether the IMS service subscription and triggers IMS session, S-CSCF processing sessions, routing control, according to IMS services subscription information triggered AS, AS CS user is fixed network service control, to provide IMS services; HSS also extended function for fixed network and storage management CS user in an IMS subscription service data.

The difference this solution brings obvious benefit that provides services using IMS for fixed circuit domain users, and business has nothing to do with the network, greatly accelerate service deployment and expansion, greatly reduce the low-cost service customization; at the same time IMS also bring new business for the fixed network CS user experience, improved user interface, user-friendly operation, improve user enthusiasm, bring new business growth point for operators; while achieving fixed and mobile networks in business reuse and integration, reduce operating costs. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic illustration of the frame structure and IMS functional entities;

FIG 2 (a) is a flowchart of processing to provide the IMS service when calling fixed network CS user first embodiment embodiment;

FIG 2 (b) is a flowchart of processing to provide IMS services to the embodiment when the called user and the fixed network domain exhalation circuit path into a first embodiment of an IMS domain;

FIG. 2 (c) to a first embodiment of the fixed network and the called CS user outgoing process flow diagram for provision of IMS services into the IMS domain when no path;

FIG. 3 (a) to a second embodiment of the fixed network to provide CS user processing flowchart for the calling IMS service;

FIG 3 (b) is a flowchart of processing to provide IMS services to the embodiment when the called user and the fixed network domain exhalation circuit path into a second embodiment of an IMS domain;

Providing IMS service processing flowchart when the fixed network CS user in FIG. 3 (c) to a second embodiment of the exhalation path and does not enter the called IMS domain for.

Embodiment of the present invention to make the objectives, technical solutions, and advantages of the present invention will become apparent in conjunction with the accompanying drawings below of the present invention will be described in further detail.

The core aspect of the present invention is: a method of providing service for the CS domain user method for IMS system, comprising: setting IMS service in the IMS domain user is a circuit information processing rule; subscribes to the IMS domain user service circuit call into a SIP format, the call is routed to the IMS CSCF for processing the CS domain user session; the CSCF obtaining an IMS service user domain information of the current processing rule circuit performs session control according to the service information processing rule , sends a service processing request relates to the aS; aS receiving the service processing request, acquires service information of the current processing rule circuit domain user, the service control circuit domain user according to the service information processing rule.

The frame of the present invention are given IMS IMS session processing and CS domain and the IMS specification fixed network to provide service for fixed interconnection circuit domain user session flow and related processing methods. In the present invention, the fixed network CS user in the IMS domain may be identified by a SIP identifier or subscription information through an IMS service which the Public Service Identity (PSI, Public Service Identity) for identifying; the SIP uniform resource identifier may be a SIP Locator URL (Universal resource Locator), or a SIP uniform resource identifier (URI, Universal resource identifier); user or PSI corresponding IMS service processing rule information stored in the HSS, the HSS maintenance management for other units inquiries download. Whether the user subscribes for IMS services fixed-discrimination, is determined by the PSTN network initiating node and then forwarded to MGCF, the MGCF may also be forwarded directly determined. In the service request into the IMS domain by itself, or after an IMS domain, the S-CSCF or MGCF determines triggered session, and subscription information according Gen 4 routes the session to the AS corresponding to the service, service control of the AS by the fixed network users, providing IMS business. At the end of the service, by BGCF / MGCF routed back to the PSTN, processing IMS domain ending. Throughout this process, the session in the IMS domain SIP protocol to meet, but need to carry the necessary information in the call related information, or the information contained in the subscription information in the SIP request. Thereby implementing IMS for fixed circuit direct access to the user domain and provide IMS services.

To the spirit of the invention described in more detail, the following possible embodiment is given in many cases. In a first embodiment of the present invention, the use of SIP UL or SIP URI in the IMS domain user identification fixed network, by the user IMS service triggering process flow. As a result of using the SIP URL and the user's SIP URI identifies fixed invention no difference, so the present embodiment, SIP URI to identify the user as an example the fixed network. In many cases the user domain calling and called fixed circuits and the like, which access process depicted in Figure 2. Wherein FIG. 2 (a) to a first embodiment when the fixed network CS domain calling user embodiment processing flowchart for providing IMS service; FIG. 2 (b) to the fixed network CS user called a first embodiment and the provision of the IMS service process flow diagram for an outgoing call path into the IMS domain; FIG. 2 (c) to a first embodiment of the fixed network and the called outgoing CS user to provide service when the IMS does not enter the path of the IMS domain processing flowchart. The following detailed description of the procedure for the embodiment of three cases of the first embodiment.

Referring to FIG. 2 (a), to provide service when said fixed network IMS CS user calling a first embodiment of a process flow comprising:

Step 211, i.e. fixed CS user UE initiates fixed dialed call to the PSTN.

Step 212, PSTN calling user according to the pre-stored service subscription information, whether the calling user subscribes to an IMS service, if the call is, simultaneous transmission indicator to the MGCF MGCF to route the call is not for indicating interworking call, but need to provide IMS calling subscriber subscription service call IMS service control; otherwise dealt with according to the existing processes.

In the present embodiment, transmitted using the inter-exchange signaling the PSTN indicator to MGCF. There are many inter-exchange signaling PSTN, in the preferred embodiment of the present invention may be used in the initial address message signaling where one ISDN User Part (ISUP, ISDN User Part) (IAM, Initial Address Message) and pass the described indicator. IAM message indicating that the call origination service and an IMS subscription for the fixed network users. As a preferred embodiment, the IAM message by the mandatory parameter "called party number" add a specific prefix to indicate that the calling user subscribes to and fixed IMS service user is required to provide IMS services control.

Step 213, after the MGCF receives the IAM message, the message in the "called number" in number analysis, the IMS subscription service according to their particular prefix code determines that the calling user, and removes the prefix code is obtained real called PSTN user number. Since the user identifier in the IMS network is SIP URI format, the PSTN subscriber number is represented by the E.164 format, and therefore, the MGCF needs to use an electronic code server (ENUM Server, Electronic Numbering Server) request from the calling subscriber number E .164 format translated into SIP URI format. Here ENUM Server needs to pre-stored corresponding relationship management fixed conversion circuit domain user number field of the SIP URI.

Step 214, ENUM Server query by converting the relationship between the caller number from the SIP URI E.164 format translated format, and returns the result to the translation MGCF.

Step 215, MGCF converts the IAM message translated to SIP request (INVITE) message (translation method is known prior art), the source address in the INVITE message using the SIP URI format translation; while in the INVITE message indicating the calling fixed network user subscribes to the CS domain user and the IMS service indicator. In the present embodiment, the indicator may be utilized INVITE message "call information" extended definition of the caller additional information (Call-Info) or header provided by the called user in the "object" (Purpose) parameters identified. The MGCF sends an INVITE message to the S-CSCFL herein calling processing session control, the session control on behalf of the calling process with the S-CSCF1 the S-CSCF, i.e., the calling party S-CSCF; S-CSCF2 Representative called session control processing S-CSCF, i.e., the called S-CSCF.

Step 216, the S-CSCF1 receives the INVITE message, the calling user session control process; process is distinguished from the prior art: The calling user determines parameter values ​​purpose INVITE message Call-Info header field is fixed CS user and an IMS subscription service, a service processing rule query the local user information, if the information does not exist locally, the request to the HSS to download; then trigger the service processing rules according to IMS ASl user information, herein AS1 is expressed by the calling service control, i.e. the calling party AS; AS2 expressed is called service control, i.e. the called party AS, S-CSCF1 to the AS1 transmits an INVITE message, the message indicates to the calling subscriber is still fixed CS user and an IMS subscription service.

In the present invention, a user may be multiple IMS service subscription, the subscription information is recorded as part of the business rules in the user's information processing rule, S-CSCF1 processed according to subscription rules, e.g., three AS subscription service, and there is order, may in turn trigger the corresponding AS in order.

In the present invention, S-CSCF requests the HSS to download service processing method for an information processing rules may be one of the following ways: The first way, S-CSCF downloads the information to the service processing rules obtained not stored, i.e. session release after the information is deleted business processing rules will be re-downloaded each time a new call; the second way, stored permanently downloaded to the business processing rules, and further first check before each call whether to store the local business information processing rules if not before going to download HSS, after the session release processing rules remain the business information storage; third way, using the data update aging mechanism, the upcoming business rules processing information stored for some time, if it exceeds a certain threshold (such as no more than 24 hours call), then delete locally saved information business processing rules, and further to inquire whether local store the information business process rules before each call, if you did not go HSS download. The method of processing a request to download the above-described S-CSCF to the HSS service information processing rule is also applicable to the present invention, other processing nodes in the network, for example, S-CSCF2, IMS AS1 and IMS AS2 peer node.

Step 217, when the IMS AS 1 receives the INVITE message, according to the purpose parameter value of the Call-Info header field in the message is determined whether the calling user is a fixed network subscription CS user and an IMS service, is at a local query the user business process rule information that if the local does not exist, to the HSS a request to download; followed by the appropriate service control according to the user service processing rule information (what traffic control process particularly performed, not within the scope of the present invention as discussed), processed , sends an INVITE message to the S-CSCF1.

Step 218, S-CSCF1 receives the INVITE message, the calling user to continue service according to the user service processing rule information service subscription rule triggers or called user addressed. At this time, if the service subscription rules also described new service needs to be triggered AS, continues to trigger new AS, AS sends an INVITE message to the new, the message indicates to the calling subscriber is still fixed and CS user subscribes IMS service, returns to step 217; if not a new service AS, S-CSCF1 route the subsequent completion of the addressing function for the called user.

In FIG 2 (a) to a first embodiment when the fixed network CS domain calling user Example flowchart for provision of IMS services. When the fixed network CS user is called, the flow of IMS service to provide two cases: first, when an incoming call a fixed network subscriber circuit domain, the IMS needs an incoming call for the called user to provide a kinds of traffic control application, while half of the call, i.e., outgoing signaling path has entered the IMS, the calling subscriber service processing is completed, the IMS for fixed circuit addressing domain called user; second, incoming a fixed network CS domain user, the incoming call requires a certain service provided by the IMS application control for the called user, and the first half of the call, i.e., outgoing signaling path and without IMS.

Referring to FIG. 2 (b), provide the IMS service processing flow for the first embodiment when the fixed network and the called CS user exhalation into the path of the IMS domain. The process includes:

Step 221, S-CSCF1 receives the INVITE message into the IMS domain exhalation path, the circuit of the fixed network addressing domain called user, the called E.164 address format, the request to the ENUM Server from the called subscriber number E.164 format translated into SIP URI format.

Step 222, ENUM Server configured by the called subscriber number from the query E.164 format translates into SIP URI format, and returns the result to the translation S-CSCF1.

Step 223, S-CSCF1 obtained SIP URI format of the called subscriber number, and sends an INVITE message to the called home domain S-CSCF2, called address in the message format using the SIP URI translation. S-CSCF1 for the S-CSCF2 exactly the same routing and addressing methods 3GPP IMS standard defined by the present invention is not described.

Step 224, S-CSCF2 receiving the INVITE message, the called user session control process; process is distinguished from the prior art: Query service processing rule information in the called subscriber local, if no request to the HSS is queried downloading; then the service processing according to a user rule information service subscription rule triggers an IMS AS2, S-CSCF2 sends an INVITE message to the IMS AS2, business applications provide control of the called user AS2.

Step 225, IMS AS2 receives the INVITE message, the query processing service information of the called user rule locally if no inquiry request to the HSS to download; followed by the corresponding application service control information according to a user service processing rules, the post-processed S-CSCF2 sends an INVITE message.

Step 226, S-CSCF2 receiving the INVITE message from the AS2 continue the called user or service triggering route addressing service processing according to a user rule information service subscription rules. At this time, if the service subscription rules also describe the new AS business to be triggered, continue to trigger new AS, sends an INVITE message to the AS new, new AS receives the INVITE message, returns to step 225; if no new AS business, the S-CSCF2 for the current routing address of the called user.

When the S-CSCF2 for the current addressing called user, if the called party does not occur due to changes of the service control AS, the S-CSCF2 reacquire PSTN E.164 number format called user, the called user PSTN number sent as the called address of the INVITE message to BGCF, proceeds to step 227; if not retrieve the called user's PSTN number where the S-CSCF2 will continue in route to the current in the IMS domain of the called user URI address, the called user actually cause the circuit domain route fails. If the called user and the service control changes due to the AS, the process according to the existing process.

In the present invention, S-CSCF2 reacquire the called user has a variety of PSTN E.164 number format, such as setting a valid "CS domain Routing Number" in the subscription information of the called user, the effective "CS domain Routing number ,, a "specific prefix code" + "PSTN number of the called user" component, the "specific prefix code indicating ,, S-CSCF2 does not require translation request again ENUM Server called number in E.164 format, directly PSTN number of the called user route; in addition, a request may be translated to ENUM Server called E.164 number format. .

After step 227, BGCF receives the INVITE message, the call is routed to the PSTN, the process as defined in 3GPP IMS standards. Continue to the called user addressed by PSTN.

Referring to FIG. 2 (c), of a first embodiment of the fixed network and the called user domain outgoing circuit to provide a process when the IMS service does not enter the path of the IMS domain. The process includes:

Step 231, a fixed network domain user incoming circuit, PSTN incoming IAM message is received, the called user according to the subscription information stored in advance is determined whether the called user subscribes to IMS services is the PSTN sends an IAM message to the MGCF, and indicating that the called user subscribes to an IMS service, otherwise, the process according to the existing IMS processes.

In the present embodiment, PSTN sends an IAM message to the MGCF when, by the message I AM Required parameter "called party number" add a specific prefix code indicating that the called user subscribes to an IMS service, the need for the IMS which provides service control.

Step 232, MGCF receives the IAM message, the message number analysis performed in the "called number", after determining that the called user subscribes to an IMS service, remove the prefix obtained real called their specific prefix code PSTN user number. ENUM Server MGCF requests the called number is translated into the E.164 format from the SIP URI format.

Step 233, ENUM Server configured by the called subscriber number from the query E.164 format translates into SIP URI format, and returns the result to the translation MGCF.

Step 234, MGCF converts the IAM message is translated to a SIP INVITE message, the called address of the INVITE message using the SIP URI format translations.

Step 235, S-CSCF2 receiving the INVITE message, the called user session control process. Specifically: the called user query service processing rules in the local information, if the information does not exist locally download request to the HSS, then the called user to trigger the IMS service processing AS2 rule information service subscription rules, the AS2 as being a provide service calling user application control, S-CSCF2 sends an INVITE message to AS2.

Step 236, IMS AS2 receives the INVITE message, the called user's query in the local subscription information, if there is a request to the HSS to download, followed by the appropriate service control rule according to the service processing user information, sends the processed S-CSCF2 INVITE message.

Step 237, S-CSCF2 receiving the INVITE message from the AS, the called subscriber for continued service triggering addressing or routing service processing according to a user rule information service subscription rules. At this time, if the service subscription rules also described new service needs to be triggered AS, continues to trigger new AS, AS sends an INVITE message to the new, the new AS receiving the INVITE message, returns to step 236. If no new service AS, S-CSCF2 for the current route addressing the called user.

When the S-CSCF2 for the current addressing called user, if the called party does not occur due to changes of the service control AS, the S-CSCF2 reacquire PSTN E.164 number format called user, the called user PSTN number sent as the called address of the INVITE message to BGCF, proceeds to step 238; if reacquire here a PSTN number of the called user is S-CSCF2 will continue in route in the IMS domain of the called user to the current UI address, the called user actually cause the circuit domain route fails. If the called user and the service control changes due to the AS, the process according to the existing process.

After step 238, BGCF receives the INVITE message, the call is routed to the PSTN, the process as defined in 3GPP IMS standards. Continue to the called user addressed by PSTN.

In the first embodiment, when the MGCF to route the call to the S-CSCF, MGCF embodiment can be configured by the data, selecting an S-CSCF to route, such as a specified class of users or directly in the configuration data corresponding to a S-CSCF; Furthermore, the MGCF may also be routed to a call to I-CSCF, a S-CSCF to obtain the address from the I-CSCF according to 3GPP IMS standard method defined by the I-CSCF then routes the call to the S-CSCF.

In the first embodiment, is judged by the PSTN user IMS subscription characteristic and through a specific notification message via MGCF prefix, the prefix code number MGCF analysis determines that the user subscribes to an IMS service request to the primary ENUM Server PSTN number called user or the called user's E.164 format is translated into SIP URI format. Another embodiment is: PSTN is not determined, PSTN user calls unconditionally routed directly to the MGCF, MGCF subscription information stored in advance, and provides the user authentication processing function to intercept the call, i.e., the current is determined according to prestored user subscription information whether an IMS service subscription, if the user subscribes to the IMS service, the MGCF requests the PSTN number to ENUM Server E.164 format caller or called subscriber translated into SIP URI format; if no IMS service subscription, the call returns the MGCF to the PSTN.

In the first embodiment, the fixed network CS user can directly dial the called number dialing, PSTN service access code number of analysis IMS service access code, to route the call to the MGCF, user authentication provided by the MGCF right process to function call interception, if the user subscribes to an IMS service, the MGCF requests the PSTN number to ENUM Server E.164 format caller or called subscriber translated into SIP URI format; if no IMS subscription service, the MGCF the call to return to the PSTN.

In an embodiment of the SIP URI identification, a calling fixed network CS domain user and the called user in the CS domain fixed a significant difference IMS domain call flow is: S-CSCF1 need to determine if the caller is a fixed current CS domain session and the user subscribes to an IMS service, and if the user information service processing rules will not exist in the local request HSS to download, which is an extension to the standard 3GPP IMS process definition; whereas S-CSCF2 called long service discovery information processing rule local does not exist, you can go to download HSS request, in line with 3GPP IMS standards define the process. The use of PSI for IMS service triggering may make service processing rules IMS CS domain calling fixed network subscription information service download process also meet the definition of 3GPP IMS standards.

In a second embodiment of the present invention, the provision of the IMS services using PSI identifies the user for the fixed network, the IMS service is triggered by the PSI process flow. In many cases the fixed network CS domain calling and called users, etc., which are access process shown in Figure 3. Wherein FIG. 3 (a) to a second embodiment of the fixed network to provide CS user processing flowchart for the calling IMS service; FIG. 3 (b) of the fixed network user a second embodiment of the circuit domain called process to provide IMS services Figure 3 (c) CS user is fixed to the second embodiment of the exhalation path and does not enter the called IMS domain; processing flowchart when the provision of the IMS services to its IMS domain and into the exhalation path flow chart. The following detailed description of the process for the second embodiment of the three cases.

Referring to FIG. 3 (a), to provide IMS service processing flow includes a second user of said fixed network CS domain calling Example:

Step 311, the CS domain user initiates a fixed dialing a call to the PSTN.

Step 312, PSTN calling user according to the subscription information stored in advance to determine whether the primary user subscribes to an IMS service, if the IMS service subscription, the calling user according to the Gen only IMS service subscription information of a specific service composition prefix code front, and the service prefix code added to the IAM message parameter "called party number" will send an IAM message to the MGCF; if no IMS subscription service is processed according to conventional procedures.

Step 313, MGCF receives the IAM message, the message in the "called number" for number analysis, it is determined that the calling user subscribes to the service according to their particular IMS service prefix, the prefix code translated into a service corresponding to the PSI (PSI for identifying the service type of the IMS domain), and removes the prefix of the called user to get real PSTN number; the MGCF converts the IAM message translated into a SIP INVITE message, the IMS standard defined by the PSI filled INVITE to header field of the message / request-URI in the request line; PSTN number of the called subscriber will fill an area INVITE message, such as message body carried in the INVITE message (message body); INVITE message sent to the S-CSCF2. Here, MGCF to give S-CSCF2 routing address 3GPP IMS standard defined method.

Step 314, S-CSCF2 receiving the INVITE message, the query processing service rule information corresponding to the PSI locally, if the information does not exist locally, the request to the HSS to download; then the processing rule information according to the service subscription rules, triggers an IMS AS2. S-CSCF2 sends an INVITE message to AS2.

Step 315, AS2 receives the INVITE message, the called party number extracted from the message, and the business process rule information corresponding to PSI local query, if the information does not exist locally, the request to the HSS to download; where the service information processing rule indicate that the service is to provide a calling service, followed by the AS2 corresponding service control the calling user according to the service information processing rule, processed, transmits an INVITE message to S-CSCF2.

Step 316, S-CSCF2 receiving the INVITE message from the AS2 continue for PSI addressing or routing for service triggering process based on business rules PSI information corresponding to the service subscription rules, if the service subscription rules also described new service AS It needs to be triggered, the trigger new business AS, S-CSCF2 sends an INVITE message to the AS new trigger, returns to step 315; if the routing address, S-CSCF2 remove the current message from the called address in the routing addressing.

In FIG 3 (a) is a second embodiment of fixed CS user calling a flowchart for provision of IMS services. When the fixed network CS user is called, the flow of IMS service to provide two cases: first, when an incoming call a fixed network subscriber circuit domain, the IMS needs an incoming call for the called user to provide a kinds of traffic control application, while half of the call, i.e., outgoing signaling path has entered the IMS, the calling subscriber service processing is completed, the IMS for fixed circuit addressing domain called user; second, incoming a fixed network CS domain user, the incoming call requires a certain service provided by the IMS application control for the called user, and the first half of the call, i.e., outgoing signaling path and without IMS.

Referring to FIG. 3 (b), of a second embodiment of the fixed network and the called CS user exhalation into the path of the IMS domain to provide a process when the IMS service. The process includes: Step 321, S-CSCF receiving the INVITE message, the circuit of the fixed network addressing domain called user, the called E.164 address format, the translation request to the ENUM Server fails, S-CSCF routes the session to BGCF. The second embodiment according to the present embodiment, ENUM Server conversion relation is no corresponding pre-stored fixed CS user management number field of the SIP URI, and therefore translation fails.

Step 322, BGCF will then route the INVITE message to the MGCF.

MGCF further comprising a user for indicating whether the called IMS service processing flag processed IMS services.

Step 323, MGCF receives the INVITE message, the IMS service processing in accordance with the flag that determines whether the called subscriber fixed network CS domain treated IMS service, if it is not treated IMS service, the subscription based on pre-stored user information is IMS service the calling subscriber service authentication process, if the called user subscribes to an IMS service, the MGCF subscription information according to its particular combination of a service corresponding PSI; IMS standard defined by the PSI filled INVITE message, e.g. fill in to header field of the message / request-URI in the request line, a PSTN number and the called subscriber in the other area fill message; method sends INVITE message to S-CSCF2, MGCF to give S-CSCF2 routing address with 3GPP IMS standards defined above; if the called subscriber while the MGCF of the IMS service treated IMS service processing flag is set to indicate the treated IMS service. If the called party does not subscribe IMS service or has been treated IMS service, MGCF to route the call to the PSTN.

Step 324, S-CSCF2 receiving the INVITE message, the local query To header field / Request-URI rule information service processing request line corresponding to PSI, if the information does not exist locally, the download request to the HSS, and then in accordance with the obtained contracting business rules in information processing rules, triggers a IMS AS2. S-CSCF2 sends an INVITE message to AS2.

Step 325, AS2 receives the INVITE message, the called party number extracted from the message, the local service processing rule information corresponding to PSI inquiry, if the subscription information does not exist locally, the download request to the HSS, then the information processing rule according to the service ( in this business process rule information, it is possible to specify the called service trigger) corresponding to the called user service control and sends an INVITE message to S-CSCF2 after processing.

Step 326, S-CSCF2 receiving the INVITE message from the AS2 continue for service triggering for PSI addressing or routing traffic according to a processing rule corresponding to the PSI information service subscription rules. At this time, if the service subscription rules also described new service needs to be triggered AS, continues to trigger a new service AS, S-CSCF2 sends an INVITE message to the AS new trigger returns to step 325; if the routing address, S-CSCF2 remove the current called address from the message body, for routing and addressing.

Referring to FIG. 3 (c), to provide IMS service processing flow of the second embodiment of the fixed network and the called CS user does not enter the outgoing path IMS domain. The process includes:

Step 331, a fixed network domain user incoming circuit, PSTN incoming IAM message is received, it determines whether the called user subscribes to an IMS service according to the subscription information of the called user stored in advance, is the IMS service according to the called user subscription information of a combination of a specific service prefix and prefix in front of the service added to the IAM message parameter "called party number", and sends an IAM message to the MGCF.

Step 332, MGCF receives the IAM message, the message in the "called number" for number analysis, it is determined that the called user subscribes to the service according to their particular IMS service prefix, the prefix code translated into a service corresponding to the PSI, and removes the prefix of the called user to get real PSTN number; the MGCF converts the IAM message translated into the INVITE message, the IMS standard defined by the PSI filled INVITE message, e.g. fill in the to field of the message / request-URI in the request line, and the number of the called subscriber PSTN filling the message in other areas; the MGCF sends to the S-CSCF2 INVITE message. To give S-CSCF2 MGCF address routing method defined 3GPP IMS standards.

Step 333, S-CSCF2 receiving the INVITE message, the query processing service rule information corresponding to PSI locally, the service information, if the local processing rule does not exist, a request to the HSS to download; then processing rule according to the service information obtained in the subscription rule , a trigger IMS AS2; S-CSCF2 sends an INVITE message to AS2.

Step 334, AS2 receives the INVITE message, the called party number extracted from the message, the local service processing rule information corresponding to PSI inquiry, if the information does not exist locally, the request to the HSS to download; here, the service information processing rule indicating that the called service call is triggered, the AS2 corresponding to the called user service control and sends an INVITE message to S-CSCF2 after processing.

Step 335, S-CSCF2 receiving the INVITE message from the AS, continues to be service triggering PSI or PSI routing address corresponding to the service subscription according to the rules in the rule information service processing. At this time, if the service subscription rules also described new service needs to be triggered AS, continues to trigger a new service AS, S-CSCF2 sends an INVITE message to the AS new trigger, returns to step 334; if not a new service AS, the remove the current S-CSCF2 called address from the message body for routing and addressing.

In the second embodiment, a user may be judged PSTN IMS subscription characteristic and combined into one service prefix notification message through the MGCF, the MGCF service prefix translated PSI. Another embodiment may be: PSTN is not determined, PSTN user calls unconditionally routed directly to the MGCF, MGCF subscription information stored in advance, and provides the user authentication processing function to intercept the call, if the user subscribes to an IMS service, the MGCF provides specific service subscription information, subscription information directly according to the service corresponding to the PSI composition out; if the user does not subscribe IMS service, the MGCF returns the call to the PSTN.

In the second embodiment, the fixed network CS user can directly dial the called number dialing, PSTN service access code number of analysis IMS service access code, to route the call to the MGCF, MGCF prestored signing information, and provides the user authentication processing function for call interception, if the user subscribes to an IMS service, the MGCF providing specific service subscription information, subscription information directly according to the service corresponding to the PSI composition out; if no IMS service subscription, the call returns the MGCF to the PSTN.

In the embodiment of the present invention, PSTN calling user in the IMS determines that the subscriber network nodes may be caller's originating office or tandem office switch; the PSTN to the called user in the IMS determines that the subscriber's network node may be called user's office or tandem office switch floor. Further, the configuration may be fixed home location register (Home Location Register, referred to as "HLR") in the PSTN network when the call passes by the HLR HLR determines whether the call sign of the IMS service.

Further, the present invention corresponding to the rules in the business process management information stored in the HSS service the PSI, PSI comprising the service subscription information of the calling or called PSI service attributes. The PSI AS according to the subscription information in the calling or called attributes, service control is determined to provide the calling user or the called CS domain CS user.

Although embodiments of the present invention by reference to certain preferred, the invention has been illustrated and described, those of ordinary skill in the art should understand that various changes may be made thereto in form and details the appended claims without departing from the spirit and scope of the invention defined in the appended.

Claims

Claims
A service providing method for the CS domain user, suitable for use on the IMS Internet Protocol multimedia subsystem, characterized by comprising the steps of:
IMS services provided in the IMS to CS user information processing rule;
The subscription services of IMS domain user circuit call into a format of a Session Initiation Protocol SIP, the call is routed to the IMS call session processing service for the CS domain user session control function CSCF unit;
The IMS CSCF obtaining information of the current service processing rules circuit domain user, session control processing rule according to the service information, sends a service processing request to the application server involved in the AS;
The AS accepting service processing request, acquires service information of the current processing rule circuit domain user, the service control circuit domain user according to the service information processing rule.
2. The method of providing services to a user of the circuit domain to claim 1, characterized in that, the SIP message processing rule identifies the IMS service provided by the circuit using a domain user in the IMS distinguish.
3. The method of providing services to a user of the circuit domain of claim 2, wherein the CS domain user in the IMS uses SIP identified as: SIP URL Uniform Resource Locator, or URL is a SIP uniform resource identifier
4. The method of providing services to a user of the circuit domain to claim 3, wherein, when the calling subscriber CS domain user, the method comprises:
A1, a circuit domain network subscription services call routing IMS CS domain user to the IMS-Media Gateway Control Function MGCF, MGCF said circuit domain user identification number into a SIP format, translates the SIP call request message ;
BL, and sent to the CSCF for processing the CS domain user session, the SIP request message carries the calling user to indicate the user is a circuit domain and IMS subscription information indication service;
C1, the CSCF determines that the information message indicating that the user is a CS user and an IMS service subscription, the IMS service processing rules acquired information of the calling user according to the SIP request from the MGCF according to the acquired information for the calling user's call control, service-related aS sends the SIP request message contains information indicating the calling user and a CS user IMS subscription information indication service;
D1, the information message indicating the AS determines that the user is a CS user and an IMS subscription service, the service processing rules acquired information of the calling user according to the SIP request from the CSCF, according to the information obtained the calling subscriber call service control, after processing returns a SIP request message to the CSCF;
El, the CSCF receives the called address complete routing request message related to the service AS returns all of SIP.
5. The method of providing services to a user domain circuit according to claim 4, wherein, in the SIP request message, the extension field of the "object" parameter "call information" header field to indicate the said user subscription CS user and an IMS service; by treating the CSCF and the aS "object" parameter of the extension field of the received SIP request message "call information" header field, the circuit determines that the caller is IMS domain user and contract services.
6. The method of providing services to a user of the circuit domain to claim 3, wherein, when the CS domain user and the called user has exhaled into the IMS signaling path, said method comprises :
A2, calling on the CSCF receives a SIP signaling path exhalation request message, the called user address, the called user identification number into a SIP format, for processing the called subscriber to the routing session called CSCF and transmits the SIP request message, wherein the SIP identifier of the called user identity format; B2, the called CSCF obtain subscription information of the called user according to the acquired information related to the service is SIP AS sends a call request message;
C2, by obtaining the called AS subscription information of the called user according to the acquired information of the called user service control, after processing to the called CSCF returns a SIP request message;
D2, the called CSCF receives all traffic related to the called party subsequent routing session request message AS returns the SIP;. When routing session, if the called user does not change because of the above-described control operations, is the is the calling subscriber number identification from a SIP format to recover the original format of the CS domain, as the called number and a SIP request message to a Breakout gateway control function or BGCF unit MGCF, BGCF by this route the call to the MGCF or the circuit domain network .
7. The method of providing services to a user of the circuit domain to claim 3, wherein said circuit is a user and the called user does not enter its outgoing signaling path when the IMS, the method comprises:
Call routing A1, the circuit domain network subscribes to an IMS service circuit domain user to the IMS MGCF, MGCF the circuit domain user identification number into a SIP format, translates the SIP call request message;
B3, sending the SIP request message to the CSCF for processing the CS domain user session ;.
B3, the CSCF receives a SIP request message from the MGCF, of the IMS service processing rules acquired information of the called user performs call control of the called user according to the acquired information, the AS sends a SIP service request related message ;
After C3, the AS receives from the called CSCF SIP request message, the IMS service processing rules acquired information of the called user, the service control information of the called user according to the acquired call, processed to the called CSCF returns a SIP request message;
D3, the called CSCF receives a subsequent request message routing session after all related to the service of the called party returns the SIP AS; in routing the session, if the called user does not change because of the above-described control operations, the called party is a user identification number from a SIP format to recover the circuit domain format, and transmits the SIP request message to the BGCF outlet or as a called number MGCF, BGCF by this route the call to the MGCF or the circuit domain network.
8. The method of providing services to a user circuit domain 4 or claim 7, wherein the step A1 comprises:
IMS subscription of the circuit domain network service according to the IMS service subscription information preset by the user of the circuit domain, the domain user call via a circuit domain network inter-exchange signaling circuit routing to MGCF of the IMS, and the letter the user instructed the CS user and an IMS subscription service;
Analyzing the MGCF according to the inter-office signaling circuit domain network that the user subscribes to the CS user and an IMS service, the circuit domain user identification number into a SIP format, the inter-channel circuit domain network Board SIP call request so translated message.
9. A method of providing services to a user of the CS domain according to claim 8, characterized in that, in the circuit domain network, the IMS service subscription information preset in said circuit switch domain user's home exchange, a the switch circuit is determined that the user subscribes to an IMS services domain.
10. A method of providing services to a user of the circuit domain of claim 8, wherein the IMS service subscription information preset in the circuit domain network-configured fixed home location register, the CS domain user when the home location register after the calling fixed network, by the circuit is determined that the user subscribes to IMS services domain.
11. The method of providing services to a user of the circuit domain of claim 8, wherein said circuit domain network between the circuit domain network Bureau transmitted to the MGCF is a signaling Integrated Services Digital Network User Part letter the start address of the IAM message order, "called Party number" parameter of the message by the CS user called number prefix add specific composition, for instructing the user is a CS user and an IMS service subscription; the Analyzing said MGCF according to the start address message "called party number" of a specific prefix code to the user and the CS user subscribes to an IMS service.
12. The method of providing services for the CS user 4 or claim 7, wherein the step A1 comprises:
All the circuit domain network CS domain user route the call directly to the IMS the MGCF;
MGCF default subscription information judging whether the IMS service the user subscribes to the CS domain IMS service, the domain user is the circuit identification number is converted to a SIP format, the inter-exchange signaling circuit domain network call translated SIP request message.
13. The method of providing services for the CS user 4 or claim 7, wherein the step A1 comprises:
Adding service access code before the called number when a call to the CS user, after the circuit domain network service access code to analyze the call, routing the call to the MGCF said;
MGCF according to a preset IMS service registration information to determine whether said circuit domain user registered IMS service, the domain user is the circuit identification number is converted to a SIP format, the inter-exchange signaling circuit domain network call translated SIP request message.
14. A service providing any one of the methods for the CS domain user to 4 according to claim 7, wherein said converting circuit domain user identification number for the specific format into SIP mode: an electronic coding storage management server for storing correspondence relationship between the SIP identifier and the circuit domain user number, by querying the electronic encoder circuitry converts the domain user identification number of the SIP format.
15. The method of providing services to the CS user 6 or claim 7, characterized in that, the called subscriber number from a SIP identifier format recovery circuit domain format specific method is as follows: the IMS set CS domain number information service processing rule information includes the user domain circuit, the recovery circuit CSCF gamut format number of the called user by the IMS service processing rules acquired information.
16. The method of providing services to a user of the circuit domain of claim 1, wherein, the IMS service information processing rule set distinguished by the Public Service Identity PSI.
17. The method of providing services to a user domain circuit according to claim 16, wherein said calling subscriber CS domain when a user, the method comprises:
Al, said circuit domain network will route the call sign of the circuit domain user to the IMS-IMS service MGCF, MGCF generates a domain user service circuit corresponding to a PSI IMS subscription, the call is translated and sent to a SIP request message CSCF for processing the CS domain user session, wherein said carrying PSI and a called number;
BL, the CSCF receives the SIP request message to obtain the IMS service processing rule information corresponding to PSI, according to the acquired information related to the service AS sends a SIP request message, wherein the PSI contains;
cl, the AS receives the SIP request message to obtain the IMS service processing rule information corresponding to PSI, the service control domain circuit according to the user information acquired, after processing returns a SIP request message to the CSCF;
DL, the CSCF receives all traffic related to AS returns a SIP request message, the called address complete routing.
18. The method of providing services to a user of the circuit domain of claim 16, wherein, when the CS domain user and the called user has exhaled into the IMS signaling path, said method comprises :
a2, on the outgoing call signaling path, CSCF of the called user will be routed to the MGCF SIP request message;
b2, the MGCF receives a SIP request message, IMS subscription information according to a preset service determines that the called subscriber is a CS user and an IMS subscription service, subscription service information according to the IMS to give the corresponding the PSI, and then Into processing the called user to the called CSCF sends the SIP session request message comprising the called number and using said PSI;
c2 the called CSCF receives the SIP request message, acquires the PSI corresponding IMS service processing rule information according to the acquired information related to the service AS sends a SIP request message, wherein the PSI contains;
d2, the AS receives the SIP request message to obtain the IMS service processing rule information corresponding to PSI, the service control of the called user according to the acquired information, after processing returns a SIP request message to the CSCF ;
e2, the called CSCF upon receipt of all business related AS returns a SIP request message, the called number is routing addressing.
19. The method of providing services to a user of the circuit domain of claim 18, wherein said method further comprises:
In the MGCF is provided for indicating whether the called IMS service processing flag processed IMS service, the MGCF after receiving the SIP request message, the home IMS service processing flag determines whether the called service has been treated, if so, then the called route network to the CS domain, or the user determines that the user is a CS domain and an IMS subscription service, the subsequent steps while the user's IMS service processing flag is set.
20. The method of providing services to a user of the circuit domain of claim 16, wherein the user is a called user circuit, and which did not enter the path of the outgoing signaling the IMS, the method comprises :
Al, said circuit domain network will route the call sign of the circuit domain user to the IMS-IMS service MGCF, MGCF generates a domain user service circuit corresponding to a PSI IMS subscription, the call is translated and sent to a SIP request message CSCF for processing the CS domain user session, wherein said carrying PSI and a called number;
b3, the CSCF receives the SIP request message to obtain the IMS service processing rule information corresponding to PSI, according to the acquired information related to the service AS sends a SIP request message, wherein the PSI contains;
c3, the AS receives the SIP request message to obtain the IMS service processing rule information corresponding to PSI, for industrial control of the called user according to the acquired information, after processing returns a SIP request message to the CSCF;
d3, the CSCF upon receipt of all business related AS returns a SIP request message, the called number is routing addressing.
21. The method of providing services to users CS domain 17 or claim 20, wherein said step al comprises:
Said circuit domain network determines that the user subscribes to the CS domain IMS service, the home IMS user service subscription information corresponding to a combination of a specific indication information is sent to the MGCF through an IAM message according to a preset IMS service subscription information ;
Analyzing the MGCF according to the specific indication information that the user is a CS user and an IMS subscription service and translating the particular indication information corresponding to the PSI, translates the SIP call request message to the CSCF sends, wherein the PSI and a called number comprising.
22. The method of providing services to a user of the circuit domain of claim 21, wherein the specific indication information for a specific combined service prefix, plus the IAM message in the "called number" parameter earlier.
23. The method of providing services to a user of the circuit domain of claim 21, wherein, in the circuit domain network, the IMS service subscription information preset in said circuit switch domain user's home exchange, a the switch circuit is determined that the user subscribes to the domain IMS service, the subscription information of the switch by a composition according to the specific indication information corresponding to the user's IMS service.
24. The method of providing services to a user of the circuit domain of claim 21, wherein the IMS service subscription information preset in the circuit domain network-configured fixed home location register, the CS domain user fixed network call through said home location register determines that the CS domain by a user subscribes to an IMS service, the home location register by the fixed network subscription information according to the user's IMS service corresponding to the combination of the specific indication information .
25. The method of providing services to users CS domain 17 or claim 20, wherein said step al comprises:
All the circuit domain network CS domain user route the call directly to the IMS the MGCF;
MGCF default subscription information judging whether the IMS service the user subscribes to the CS domain IMS service, if yes, according to the user subscription information corresponding to a combination of an IMS service corresponding to the PSI, translates the SIP call request message to the CSCF sends, including PSI and the called number.
26. The method of providing services for the CS domain user 17 or claim 20, wherein said step al comprises:
Adding service access code before the called number when a call to the CS user, said circuit domain network analysis showing the service access code, and routing the call to the MGCF in a call;
MGCF default subscription information judging whether the IMS service the user subscribes to the CS domain IMS service, if yes, according to the user subscription information corresponding to a combination of an IMS service corresponding to the PSI, translates the SIP call request message to the CSCF sends, including PSI and the called number.
27. The method of providing services for the CS domain user 1 to 7, 16 to 20 according to any one of the preceding claims, wherein said information processing rule IMS service provided at the IMS Home Subscriber Server HSS, the IMS the apparatus acquires from the HSS in the IMS service subscription information.
28. The method of providing services to a user of the circuit domain of claim 27, wherein said processing rule acquiring the IMS service information from the HSS comprises: the IMS service party acquiring the local query to be acquired information processing rules, if there is the local information, direct access to local information otherwise the query to the HSS in the IMS service and download the information processing rules, and tilted downward and crashed IMS service processing rule information stored permanently or temporarily stored.
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