WO2007041929A1 - A system and method for providing the service from the ims network to the cs network - Google Patents

Abstract

A method for providing the service from the IMS network to the CS (Circuit Switch) network comprises: the call control function entity of the CS network implements the service trigger detection, and transmits the service request message to the service edge proxy after triggering successfully; the service edge proxy maps the service request message of the CS network to the service request message of the IMS network, and forwards the service request message after mapped to the IMS application server so that the IMS application server implement the service logic control; according to the service control message, the service edge proxy controls the subsequent service flow of the call control function entity of the CS network. The present invention also provides a system for providing the service from the IMS network to the CS network. According to the present invention, the users of the CS network can use the supplementary service provided by the end office and the intelligent service provided by the intelligent network, and also can use the other services provided by the IMS application server.

Description

 TECHNICAL FIELD The present invention relates to communication technologies, and more particularly to a system and method for an IMS network to provide services to a circuit switched network. Background technique

IMS (IP Multimedia Subsystem) is an IP multimedia subsystem in the WCDMA (Wideband Code Division Multiple Access) network defined by the 3GPP R5/R6 standard. It is a 3G (3rd generation) mobile network that implements packet voice and packet data to provide uniformity. The target network of multimedia services and applications.

 The IMS adopts the IP packet domain as the bearer channel for its control signaling and media transmission, and adopts the SIP protocol as the call control signaling, which realizes the separation of service management, session control and bearer access.

 In IMS, services are uniformly provided by the application server (AS), and session control is performed by the S-CSCF (Serving Call Session Control Unit), which are completely separated in the network structure, and the service is triggered by the S-CSCF to the AS, and multiple AS can work together. The user accesses the IMS through the visited domain node P-CSCF (Proxy Call Session Control Unit) where the current location is located. The session and service control are always completed by the home domain node where the subscription is located, so the user can always get the same at different access points. Service, IMS session control and service control functions are independent of access. The IMS user subscription data is centrally managed in the HSS (Home Subscriber Server).

 Circuit-switched networks refer to communication networks that provide services for fixed and mobile users in traditional PSTN and PLMN networks.

 The way in which the circuit-switched network provides services to users is to implement supplementary services in the end office. The intelligent services of the network are controlled by the SSP (Service Switching Point) reported to the SCP (Service Control Point) of the intelligent network.

In existing circuit switched networks, intelligent services can be provided to users of the circuit switched network via an intelligent network. The SSP of the circuit-switched network reports the call information of the user to the SCP of the intelligent network according to the service triggering rule, and the SCP passes the INAP/CAP according to the service logic (Intelligent Network Application Procedure/CAMEL Application) Program part) primitive, which controls the SSP for subsequent call connection. However, users of the circuit switched network cannot share the service control of the IMS, resulting in the IMS service not benefiting the users of the circuit switched network. Summary of the invention

 It is an object of the present invention to provide a system and method for an IMS network to provide services to a circuit switched network so that users of the circuit switched network (including the PSTN network and the CS domain (circuit domain) of the PLMN network) can use the services provided by the IMS network. .

 The present invention discloses a service edge proxy for implementing an IMS (IP Multimedia Subsystem) network to provide services to a circuit switched network, including:

 a circuit domain signaling processing module, configured to process a service request message of a circuit switched network call control function entity;

 The service trigger detection module is configured to perform IMS network service trigger detection on the service request message according to the subscription data;

 The IMS signaling processing module is configured to map the service request message triggered by the service trigger detection module to the service request message of the IMS network, and then send the mapped service request message of the IMS network to the IMS application server; The IMS signaling processing module controls the call control function entity of the circuit switching network to perform subsequent service flow control by the circuit domain signaling processing module according to the received service control message of the IMS application server.

 The invention also discloses a system for an IMS network to provide services to a circuit switched network, the system comprising:

The home subscriber network server is configured to store the subscription data of the circuit switched network user in the IMS network; the circuit switching network call control function entity is configured to trigger the service detection to the service edge proxy, and then pass the service request message that detects the successful triggering through the first The interface is sent to the service edge proxy; and the subsequent service control information sent by the service edge proxy is received for subsequent service and call control; and the service edge proxy is configured to receive the service request message of the circuit switched network call control function entity by using the first interface. And performing IMS network service trigger detection on the service request message of the circuit switched network according to the subscription data in the home subscription subscriber server, and then triggering the successful service request message Generating a service request message of the IMS network, and sending the mapped service request message of the IMS network to the IMS application server by using the second interface; the service edge agent further receiving the service control message of the IMS application server by using the second interface, and then Controlling, by the first interface, a call control function entity of the circuit switched network to perform subsequent service flow control;

 The IMS application server is used to implement control of the IMS network service logic.

 The service edge proxy is disposed at an end office or gateway of the circuit switched network; the first interface employs an internal interface between the service edge proxy and the circuit switched network call control entity.

 The service edge proxy is set at a service control point of the circuit switched network intelligent network, and the first interface adopts a CAP/INAP signaling interface.

 The second interface adopts SIP signaling connection between the service edge proxy and the IMS application server.

 The service edge agent includes:

 a circuit domain signaling processing module, configured to process a service request message of a circuit switched network call control function entity;

 The service trigger detection module is configured to perform IMS network service trigger detection on the service request message according to the subscription data;

 The IMS signaling processing module is configured to map the service request message triggered by the service trigger detection module to the service request message of the IMS network, and then send the mapped service request message of the IMS network to the IMS application server; The IMS signaling processing module controls the call control function entity of the circuit switching network to perform subsequent service flow control by the circuit domain signaling processing module according to the received service control message of the IMS application server.

 The system also includes:

 The home location register is configured to store the address information of the service edge proxy, and obtain the address information of the service edge proxy from the home location register when the circuit switching network call control function entity successfully triggers the service.

The invention also discloses a method for the IMS network to provide services to the circuit switched network, comprising: the circuit switching network call control function entity performs service trigger detection, and after successful triggering, the service side The edge agent sends a service request message;

 The service edge proxy maps the service request message in the circuit switched network to the service request message of the IMS network, and forwards the mapped service request message to the IMS application server;

 The service edge agent controls the circuit switching of the network call control function entity according to the received service control message of the IMS application server.

 The step of the circuit switching network call control function entity performs service trigger detection. After the triggering succeeds, the service request message is sent to the service edge proxy. The method further includes: the call control function entity of the circuit switched network performs service trigger detection, and if the service triggers successfully, the slave The location register obtains the address information of the service edge proxy, or obtains the address information of the service edge proxy according to the local data configuration, and then sends a service request message to the service edge proxy according to the address information of the service edge proxy.

 The step of the service edge proxy mapping the service request message in the circuit switched network to the service request message of the IMS network, and forwarding the mapped service request message to the IMS application server, so that the IMS application server performs the service logic control further includes: The service edge agent obtains the subscription data from the home subscription subscriber server; and triggers the detection of the service to the IMS according to the subscription data. When the service triggers successfully, the service edge proxy maps the service request message in the circuit switched network to the service request message of the IMS network. And forwarding the service request message of the mapped IMS network to the application server of the IMS network.

 The service edge proxy is disposed at an end office or a gateway of the circuit switched network, and the circuit switching network call control function entity sends a service request message to the service edge proxy through the first interface.

 The first interface employs an internal connection between the service edge proxy and the circuit switched network call control entity.

 The service edge proxy is located at a service control point of the circuit switched network intelligent network, and the first interface uses a CAP/INAP signaling interface.

 The service request message includes any combination of any one or more of the following: a basic call message, a network call message, a short message message, a multi-connection control message, and/or a service information collection request message.

The method for the service edge agent to obtain the service message in the circuit switched network further includes: The edge proxy intercepts control signaling between the mobile switching center and the home location register.

 According to the present invention, the user of the circuit switched network can use not only the supplementary services provided by the end office but also the intelligent services provided by the intelligent network, and other services provided by the IMS application server. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a network structure diagram of an IMS network providing services to a circuit switched network according to the present invention; FIG. 2 is a flow chart showing a call of a CS domain user terminal as a calling party when a service edge proxy is located at a PLMN end office;

 FIG. 3 is a flow chart showing a call of a CS domain user terminal as a called party when the service edge proxy is located at the PLMN end office;

 Figure 4 is a flow chart showing the call of the CS domain user terminal as the calling party when the service edge proxy is located at the PLMN tandem office;

 FIG. 5 is a flow chart showing a call of a CS domain user terminal as a called party when the service edge proxy is located at the PLMN tandem office;

 6 shows a call flow chart when the service edge agent is located in the intelligent network SCP; FIG. 7 shows a network test call flow when the service edge agent is located in the PSTN intelligent network SCP; FIG. 8 shows the service edge agent located in the PSTN intelligent FIG. 9 shows a short message control flow chart when the service edge agent is located in the PSTN intelligent network SCP; FIG. 10 shows the service information collection when the service edge agent is located in the PSTN intelligent network SCP. a flow chart for controlling business logic;

 Figure 11 shows a schematic diagram of the structure of a service edge proxy. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to facilitate the understanding and implementation of the present invention, the embodiments of the present invention are described in conjunction with the drawings.

In accordance with the present invention, as shown in FIG. 1, the present invention provides a system in which an IMS network provides services to a circuit switched network. The system includes: circuit switched network user/access network, circuit switched network call control Functional entity, HSS/HLR, CS-IMS Service Edge Proxy (hereinafter referred to as Service Edge Proxy) and IMS Service Logical Functional Entity (IMS Application Server). The circuit switched network and IMS network interworking system of the present invention will be described in detail below.

 The circuit switched network subscriber/access network is used to complete the access of the circuit switched network subscriber and to send a service request message to the circuit switching network call control function entity.

 The circuit switched network call control function entity is used to perform basic call and service control for the circuit switched network user and to trigger service detection to the service edge agent. In order to enable the circuit switched network users to use the services provided by the IMS network, the functional entity also supports the following functions:

(1) Supporting an interface with the service edge proxy (interface 1), which is an internal interface when the physical location of the service edge proxy is set in the circuit switched network end office or in the tandem office of the circuit switched network, when the service edge proxy The physical location is set in the circuit-switched network intelligent network SCP location to reuse the INAP/CAP interface between the service control function and the service switching function.

 (2), supporting the service request message that successfully triggers the service to be routed to the service edge agent. If the call switching function entity of the circuit switching network performs the service trigger detection successfully, the service request message is transmitted to the service edge proxy through the interface (interface 1) with the service edge proxy.

 (3) Supporting the control of the business process by the business edge agent. Through the interface with the service edge proxy (interface 1), the service edge agent receives subsequent control information of the call, so as to perform subsequent actions of the corresponding service flow according to the subsequent control information.

 (4) The functional entity performs addressing of the service edge proxy according to the address information of the service edge proxy of the subscriber in the subscription data of the circuit switched network, or performs addressing of the service edge proxy according to the fixed data configuration information.

 The HSS saves the subscription data and dynamic registration information of the IMS network user on the IMS network, and supports the registration interface of the registration information and the download interface of the subscription data. To support the services provided by the IMS network for circuit switched network users, HSS also supports the following functions:

The subscription data of the circuit switched network user in the IMS network is saved, and the download of the subscription data is supported. The HLR saves the subscription data and location update information of the circuit switched network user, and supports the query interface of the location information and the insertion and update interface of the user data. To support circuit switched network users With the services provided by the IMS network, the HLR also supports the following functions:

 (1) Optionally, the HLR saves the address information of the service edge proxy in the circuit switched network user subscription data, so as to obtain the service edge from the home location register when the circuit switching network call control function entity performs the service triggering success. The address information of the proxy sends the service request message of the circuit domain to the service edge proxy.

 (2) Optionally, the HLR can store the user data of the PSTN, and support the user's query and update the interface.

 HLR and HSS can be combined or divided according to different networking requirements.

 A service edge proxy is used to implement interworking between the circuit switched network and the IMS network. As shown in FIG. 11, the service edge proxy includes:

 a circuit domain signaling processing module, configured to process a service request message of a circuit switched network call control function entity;

 The service trigger detection module is configured to perform IMS network service trigger detection on the service request message according to the subscription data;

 The IMS signaling processing module is configured to map the service request message triggered by the service trigger detection module to the service request message of the IMS network, and then send the service request message of the IMS network to the IMS application server; The processing module controls the call control function entity of the circuit switching network to perform subsequent service flow control by using the circuit domain signaling processing module according to the received service control message of the IMS application server;

 The IMS application server is used to implement control of the IMS network service logic.

 A communication interface is provided between the service edge agent and other functional entities in the system to implement communication with each other. The interface between them is described below.

 The interface between the service edge proxy and the IMS application server is the service control interface (also called interface 4) of the IMS, and the SIP signaling interface can be used.

The interface between the service edge proxy and the circuit-switched network call control entity uses an internal interface (also called interface 1); at this time, the location of the service edge proxy function is set at the location of the circuit-switched network call control function entity, and the service edge proxy-to-circuit exchange Service control capability of the network call control function entity The force is not limited.

 The interface between the service edge proxy and the circuit switching network call control function entity uses a CAP, INAP signaling interface (also called interface 1). At this time, the service edge proxy is set at the SCP location of the circuit switched network intelligent network, and the service control capability of the circuit switched network call control function entity is limited by the CAP interface capability or the INAP interface capability.

 In the system in which the circuit-switched network and the IMS network communicate with each other, the SCP of the circuit-switched network, the tandem office, or the SCP of the intelligent network can perform the charging of the user circuit domain service, and the IMS application server completes the charging of the user using the IMS service.

 The present invention also provides a method for implementing an IMS network to provide services to a circuit switched network through a service edge proxy, thereby enabling a circuit switched network user to use the services provided by the IMS network, in particular, the circuit switched network user calls to the circuit switched network. The control function entity initiates a service request message, and the call control function entity of the circuit switched network performs an event trigger check according to the service request message, and if the service triggers successfully, sends a service request message to the service edge proxy; the service edge agent performs a service trigger to the IMS. Detecting, if the service is triggered successfully, the service edge proxy maps the service request message in the circuit switched network to the service request message of the IMS network (such as mapping into a SIP message), and forwards the mapped SIP message to the application server of the IMS network; The service edge proxy performs the control of the subsequent service logic of the circuit switched network according to the service processing result of the IMS application server, and completes the complete process of the service.

 After the circuit switching network call control function entity receives the service request message of the circuit switched network user/access network, the circuit switching network call control function entity performs service triggering to the service edge proxy according to the service request message, and the circuit switched network call control function entity The business triggering methods to the service edge agent are as follows:

 (1) The circuit switching network call control function entity performs service trigger detection in the user service processing process according to the subscription data of the user in the circuit switched network;

(2) When the service edge proxy and the SCP functional entity of the circuit switched network intelligent network are collectively set at the physical location, the circuit switched network call control function entity performs service trigger detection according to the subscription data of the circuit switched network user in the intelligent network; (3) The circuit switched network call control function entity routes the service request message to the service edge proxy according to the fixed configuration data.

 After receiving the service request message of the call control function entity of the circuit switched network, the service edge proxy maps the service request message to a service request message (such as a SIP request message) of the IMS network, and then sends the service request message to the application server of the IMS network. . The service triggering of the service edge proxy to the IMS application server is as follows:

 (1) The service edge proxy performs service trigger detection according to the subscription data of the circuit switched network user in the IMS network.

 (2) The service edge proxy performs service trigger detection according to the local data configuration.

 The service edge agent controls the subsequent circuit switched network services according to the interaction result of the IMS application server. The following describes the situation in two cases. One case is when the service edge agent is located at the end office or the tandem office, and the other case is when the service edge agent is located in the SCP of the intelligent network.

 (1) When the service edge proxy is located at the end office or the tandem office, the service edge proxy controls the subsequent service flow of the user through an internal interface between the end office and the tandem call control function entity. When the service edge proxy is located at the end office of the circuit switched network and the location of the tandem office, after receiving the service control message of the IMS network, the service edge proxy controls the circuit through the internal interface with the end office and the tandem call control function entity. The switching network call control function entity performs the following functions:

 (a) Basic call control functions, including but not limited to, indicating continued connection, change of number or other call parameters to continue connection, reject call, etc.

 (b), complete the function of the network to initiate a call.

 (c), the function of completing multi-connection control, and the control of the intermediate process of the session and the business.

 (d) Control of short messages.

 (e) If the end office can perceive the user call or the service request contains video information and deliver the information through the internal interface between the service edge proxy and the circuit switched network call control function entity, the service edge proxy can pass the IMS application server The interaction controls the user video business logic.

(2) When the service edge proxy is located in the SCP of the intelligent network, the service edge proxy enters the user's service follow-up process through the CAP interface/INAP interface between the intelligent network SCP and the SSP in the circuit switched network. Row control, at this time, the business edge agent needs to complete the following functions.

 (a) The service edge agent completes the control function of the basic call.

 When the service edge agent is located at the location of the circuit switched network intelligent network SCP, the basic call control function is completed by interacting with the basic primitive of the INAP/CAP interface of the circuit switched network. The primitives are used for basic call control, indicating continued connection, changing number or other call parameters to continue, rejecting calls or / and calling playback.

 Primitives for basic call control functions include:

 activityTest,

 applyCharging {},

 applyChargingReport {},

 assistRequestlnstructions {},

 callGap {},

 calllnformationReport {},

 Calllnforaiation equest {},

 Cancel {},

 Collectlnformation {},

 Connect {},

 connectToResource {},

 Continue,

 Continue WithArgument {},

 disconnectFor ardConnection,

 disconnectForwardConnection WithArgument { },

 disconnectLeg {},

 entityReleased {},

 establishTemporaryConnection {},

 eventReportBCSM {},

 furnishCharginglnformation {},

 initialDP {},

initiateCall Attempt {}, moveLeg {},

 playTone {},

 releaseCall {},

 requestReportBCSMEvent {},

 resetTimer {},

 sendCharginglnformation {},

 (b) The function of the service edge agent to complete the network initiated call.

 When the service edge proxy is located in the SCP of the circuit switched network intelligent network, the function of initiating the call is completed by starting the call attempt primitive with the INAP/CAP interface of the circuit switched network. Initiating the call control includes the network side initiating a call to the terminal. The primitives for completing the function include but are not limited to: InitiateCall Attempt.

 (c) The service edge agent can complete the multi-connection control and the control functions of the session and service intermediate processes.

 When the service edge agent is located at the location of the circuit switched network intelligent network SCP, the multi-connection control function is implemented by the CPH (calling party processing) mechanism between the circuit switched network intelligent network SCP and the SSP. Multi-connection control functions include, but are not limited to, call splitting, call merge and other control functions. The primitives for completing this function include but are not limited to: SplitLeg, MergeLeg, MoveLeg.

 (3) The service edge agent interacts with the user through the USSD between the SCP and the user UE in the end office, the tandem office, the intelligent network, and the interaction can complete the specific user self between the terminal and the service edge agent. Various information defined and the delivery of instructions.

 The following describes the addressing modes of each network functional entity under the network architecture.

 (1) The circuit switching network call control function entity performs addressing according to the address information of the service edge proxy in the user subscription data.

 (2) The circuit switched network control function entity performs the addressing of the service edge proxy according to the local fixed data.

(3) Addressing mode of the service edge proxy to the IMS application server: The service edge proxy addresses according to the address information of the IMS application server in the subscription data of the user in the IMS network. The following describes the timing when the service edge agent downloads the service subscription data of the circuit switched network user in the IMS from the HSS:

 (1) When the service edge agent senses the registration of the user in the circuit switched network or the mobility management signaling information, the service edge agent downloads the subscription data of the user from the HSS after the initial registration of the user is successful or the location update process is successful.

 (2) The circuit service edge proxy adopts a method of downloading subscription data to the HSS at a fixed time when the user is not aware of the registration or mobility management signaling information of the circuit (for example, initializing the CS-IMS service edge functional entity) When successful).

 (3) The service edge agent downloads the subscription data from the HSS each time the contract data needs to be used, and caches it locally.

 (4) Optionally, the service edge proxy may take a method of locally storing the user's data in the IMS network, so that the data does not need to be downloaded from the HSS.

 According to the present invention, the service edge proxy needs to know or obtain relevant information of the user in order to better control the user service, and the method for the service edge agent to collect user information includes but is not limited to the following methods:

 (1) The service edge proxy uses the internal interface between the call control function entity of the circuit switched network to sense the circuit exchange network user information (including call signaling, PLMN mobility management signaling, etc.).

 (2) The service edge proxy intercepts the call control signaling of the circuit switched network to sense the signaling information of the circuit switched network user (including call signaling, PLMN mobility management signaling, etc.). The use of signaling interception can greatly reduce the impact on the original network. The following interception methods can be used.

 When the MSC device of the circuit-switched network modifies the data configuration, the MAP message originally sent to the HLR is sent to the service edge proxy. On the other hand, when the HLR modifies the data configuration, the signaling that needs to be sent to the MSC is first sent to the service. Edge agent. In order not to affect the original processing procedure, the service edge proxy forwards the original message sent by the intercepted MSC to the HLR to the HLR, and forwards the original message sent by the intercepted HLR to the MSC to the MSC.

(3) The service edge agent obtains service related information through the information transmitted by the USSD between the user UE and the UE. Information.

 (4) The service edge agent queries the collection user's registration status and location information through the J interface (ATI operation) with the HLR, and is used as auxiliary input information for business logic control.

 The basic principles and related art of the present invention have been described above, and the present invention will be described below by way of embodiments.

 Embodiment 1

 This embodiment assumes that the service edge proxy is located in the circuit-switched network end office (taking the mobile network as an example), and the flow is described in the case of the circuit-switched network user as the calling party and the called party, respectively.

 As shown in FIG. 2, in the case that the circuit switched network user is calling, the call flow is as follows: Step 201: The user terminal initiates a CM (Connection Management) service request message to the call control function entity of the mobile network end office. If the circuit switched network is a PSTN, the signaling between the user terminal and the end office may be an IAM message of the ISUP or another call control message.

 Step 202: The call control function entity of the mobile network end office performs the service trigger detection of the user according to the subscription data of the user in the circuit switched network. If the triggering is successful, the call control function entity sends the user's call message to the service edge proxy through the internal interface.

 The service edge proxy downloads the user data from the HSS when the user downloads the data from the HSS according to the present invention, and uses the interface 3 to download the user data from the HSS, or the service edge proxy performs the service trigger detection according to the subscription data of the locally stored user in the IMS network. If the trigger is successful, the service edge proxy obtains the address information of the IMS application server from the subscription data of the user.

 Step 203: The service edge proxy converts the call information of the circuit switched network user into a SIP message, and then sends a SIP INVITE message to the IMS application server through an interface with the IMS server.

 The service edge agent can trigger the service message multiple times to different IMS application servers for business logic control according to the contract data. For the sake of simplicity, only the flow of an IMS application server is shown here.

 Step 204: The IMS application server performs business logic control.

Step 205: The IMS application server sends the logical control result to the service edge proxy in the form of a SIP INVITE message, so as to send it to the called terminal. Step 206: After receiving the SIP INVITE message sent by the IMS application server to the called party, the service edge proxy sends a message to the call control function entity of the end office through an internal interface with the mobile network end office.

 The call control function entity of the mobile network end office sends a CM service request to the called party. If the circuit switching network is a PSTN network, the signaling message sent by the end office to the terminal may be an IAM message of the ISUP or other call control information.

 In step 207, there is more SIP/CS signaling interaction between the calling mobile user terminal and the called user terminal, and details are not described herein.

 Step 208: After the above and subsequent message interactions, the call is successfully established between the calling party and the called party. As shown in FIG. 3, when the circuit switched network user is called, the call flow is as follows: Step 301: The call control function entity of the mobile network end office receives the called request message IAM, where the message may also be Short message signaling of MAP, or other call control signaling.

 Step 302: The call control function entity of the mobile network end office performs the service trigger detection of the user according to the subscription data of the user on the circuit switched network. If the trigger is successful, the call control function entity sends the user's call message to the service edge proxy through the internal interface.

 The service edge proxy performs service trigger detection according to the subscription data of the user on the IMS network. If the trigger is successful, the service edge proxy obtains the address information of the IMS application server from the subscription data of the user.

 Step 303: The service edge proxy converts the call information of the circuit switched network user into a SIP message, and then sends a SIP INVITE message to the IMS application server through an interface with the IMS application server.

 The service edge agent can trigger the service message multiple times to different IMS application servers for business logic control according to the contract data. For the sake of simplicity, only the flow of an IMS application server is shown here.

 Step 304: The IMS application server performs business logic control.

 The IMS application server can use the ATI command to the HLR to query the location information of the called user according to the needs of the business logic, and is used as the input information of the business logic control.

Step 305: The IMS application server sends the logical control result to the service edge proxy by using a SIP INVITE message. Step 306: After receiving the SIP INVITE message sent by the IMS application server to the user, the service edge proxy sends a message to the call control function entity of the end office through an internal interface with the mobile network end office. The call control function entity of the mobile network end office sends a CM service request to the user.

 Step 307, there is still more SIP/CS signaling interaction between the calling mobile user terminal and the called user terminal, and details are not described herein again.

 Step 308: After the foregoing and subsequent message interaction, the call is successfully established.

 Embodiment 2

 This embodiment assumes that the service edge proxy is located in the circuit switched network tandem office (taking the mobile network as an example), and the flow is described in the case where the circuit switched network user is called and called.

 As shown in FIG. 4, in the case that the circuit switched network user is calling, the call flow is as follows: Step 401: The user terminal initiates a CM service request message to the call control function entity of the mobile network end office. In the case of a PSTN network, the message here may be an ISAM message of the ISUP or other call control signaling messages.

 Step 402: The end office call control function entity routes the call signaling to the call control function entity of the tandem office according to the route control mechanism.

 Step 403: The call control function entity of the gateway receives the call message of the end office, and sends the call message of the user to the service edge agent through the internal interface.

 The service edge proxy performs service trigger detection according to the subscription data of the user on the IMS network. If the trigger is successful, the service edge proxy obtains the address information of the IMS application server from the subscription data of the user.

 Step 404: The service edge proxy converts the call information of the circuit switched network user into call control information of the IMS network, such as SIP signaling, through the interface with the IMS application server, and sends the SIP signaling to the IMS application server.

 The service edge proxy can trigger the service message multiple times to different IMS application servers for business logic control according to the subscription data. For the sake of simplicity, only the flow of an IMS application server is shown here.

 Step 405: The IMS application server performs business logic control.

Step 406: The IMS application server sends a SIP INVITE message to the service edge proxy. Step 407: After receiving the SIP INVITE message sent by the IMS application server to the called party, the service edge proxy sends a message to the call control function entity of the gateway through an internal interface with the mobile network gateway. The call control function entity of the mobile network gateway sends an IAM message to the called mobile network end office.

 Step 408: The called mobile network end office sends a CM service request message to the called terminal. In the case of a PSTN network, the message here may be an ISAM message of the ISUP or other call control signaling message.

 In step 409, there is more SIP/CS signaling interaction between the calling mobile user terminal and the called user terminal, and details are not described herein.

 Step 410: After the foregoing and subsequent message interaction, the call is successfully established between the calling party and the called party. As shown in FIG. 5, when the circuit switched network user is called, the call flow is as follows: Step 501: Call control function of the mobile network end office. The entity receives the IAM message of the office to the called user.

 Step 502: The end office call control function entity performs service trigger detection according to the subscription data of the user in the circuit switched network. If the detection succeeds, the IAM cancellation step 503 is sent to the call control function entity of the gateway, and the call control function entity of the tandem office The IAM message of the end office is received, and the user's call message is sent to the service edge agent through the internal interface.

 The service edge proxy performs service trigger detection according to the subscription data of the user on the IMS network. If the trigger is successful, the service edge proxy obtains the address information of the IMS application server from the subscription data of the user.

 Step 504: The service edge proxy converts call information of the circuit switched network user into call control information of the IMS network, such as SIP signaling, through the interface with the IMS application server, and sends the SIP signaling to the IMS application server.

 The service edge proxy can trigger the service message multiple times to different IMS application servers for business logic control according to the subscription data. For the sake of simplicity, only the flow of an IMS application server is shown here.

Step 505: The IMS application server performs business logic control. The IMS application server can be based on The need of business logic, using ATI commands to the HLR to query the location information of the called user, etc., is used as input information for business logic control.

 Step 506: The IMS application server sends a SIP INVITE message to the service edge proxy.

 Step 507: After receiving the SIP INVITE message sent by the IMS application server to the called party, the service edge proxy sends a message to the call control function entity of the gateway through an internal interface with the mobile network gateway. The call control function entity of the mobile network gateway sends an IAM message to the mobile network end office of the called user.

 Step 508: The called mobile network end office sends a CM service request to the called user. In the case of a PSTN network, the message can be an IAM message or other call control signaling message.

 In step 509, there is more SIP/CS signaling interaction between the calling mobile user terminal and the called user terminal, and details are not described herein.

 Step 510: After the foregoing and subsequent message interaction, the call is successfully established between the calling party and the called party. Embodiment 3

 This embodiment assumes that the service edge proxy is located in the SCP of the circuit switched network intelligent network (taking the PSTN network as an example). In this embodiment, the basic call flow, the network call attempt process, the multi-connection control flow, and the short message control are respectively introduced. Process.

 As shown in Figure 6, the following describes the basic call flow in which the Service Edge Agent is located in the SCP of the Circuit Switched Network Intelligent Network:

 Step 601: The public switched telephone network user initiates a SETUP request message to the end office/SSP.

 Step 602: The end office/SSP sends an InitialDP message to the intelligent network SCP, and reports the user call information. Step 603: The service edge proxy performs service trigger detection according to the subscription data of the user on the IMS network. If the trigger is successful, the service edge proxy obtains the address information of the IMS application server from the subscription data of the user.

 Step 604: The service edge proxy converts the call information of the circuit switched network user into call control information of the IMS network, such as SIP signaling, through the interface with the IMS application server, and sends the SIP signaling to the IMS application server.

Step 605: The IMS application server performs business logic control. Step 606: The IMS application server sends the service logic control result to the service edge proxy in the form of a SIP INVITE message, so as to send it to the called party.

 Step 607: After receiving the SIP INVITE message sent by the IMS application server to the called party, the service edge proxy sends a message to the intelligent network SCP through the second internal interface with the intelligent network SCP. The intelligent network SCP sends a RequestReportBCSMEvent message to the end office/SSP, indicating that the subsequent call message is sent to the end office SSP. The intelligent network SCP sends the user's call information to the service edge agent through the second internal interface.

 Step 608: The intelligent network SCP sends a Continue message to the end office, and instructs to continue the subsequent call action.

 Step 609 615, the end office performs subsequent call setup actions, and the call is successfully established between the calling party and the called party.

 As shown in Figure 7, the service edge proxy uses the InitiateCallAttempt primitive between the SCP and the SSP to implement the network call function. The following describes the network call process:

 Step 701: The IMS application server initiates an INVITE request to the service control point SCP/service edge proxy.

 Step 702: The service control point SCP/service edge proxy initiates an InitiateCallAttempt request to the service switching point.

 Step 703: The intelligent network SCP sends the call information of the user to the service edge agent through the second internal interface. The service edge proxy sends a RequestReportBCSMEvent message to the service switching point, indicating the subsequent call message of the end office SSPJ.

 Step 704: The service edge proxy sends a Continue message to the service switching point to indicate that the service continues.

 Step 705: The service switching point sends a SETUP message to the terminal user.

 Step 706: The terminal user sends an Altering message to the service switching point.

 Step 707: The end user sends a Connect message to the service switching point.

Step 708: The service switching point sends an EventReportBCSM message to the service control point/service edge agent to report the service information. ,

 Step 709: The service control point/service edge proxy sends a 200 message to the IMS application server. Step 710: The end office performs a subsequent call setup operation, and the call is successfully established between the calling party and the called party. Figure 8 shows the multi-connection control flow. In the multi-connection control flow, the service edge proxy uses the CPH mechanism between the SCP and the SSP to implement the function. As shown in Fig. 8, the multi-connection control flow is described below.

 Step 801: The terminal 1 sends a SETUP request to the service switching point.

 Step 802: The service switching point sends an InitiateDP message to the service control point/service edge proxy. Step 803: The service control point/the service edge proxy sends an INVITE message to the IMS application server. Step 804: The IMS application server performs business logic control.

 Step 805: The IMS application server determines to send a service request message to the called party according to the service logic. The IMS application server sends an INVITE message to the service control point/service edge agent.

 Step 806: The service control point/service edge proxy sends a RequestReportBCSMEvent message to the service switching point to instruct the end office service switching point to report subsequent call messages.

 Step 807: The service control point/service edge proxy sends a Connect primitive message to the service switching point, where the called terminal number is included.

 Step 808: The service switching point sends a SETUP message to the called terminal (terminal 2 in the figure). Step 809: The called terminal sends an Altering message to the service switching point.

 Step 810: The service switching point sends an Alterting message to the calling terminal (terminal 1 in the figure). Step 811: The called terminal sends a Connect message to the service switching point.

 Step 812: The service switching point sends an EventReportBCSM message to the service control point/business edge proxy.

 Step 813: The service control point/service edge proxy sends a 200 message to the IMS application server. Step 814: The IMS application server sends a 200 message to the calling side of the service control point/service edge agent.

 Step 815: The service control point/service edge proxy sends a Continue message to the service switching point. Step 816: The service switching point sends a Connect message to the calling terminal.

Step 817: The IMS application server decides to add the terminal 3 to the session of the terminal 1 and the terminal 2. Step 818: The IMS application server sends an INVITE message to the service control point/service edge generation. The message carries the number of the terminal 3, carries the JOIN header field, and the value of the JOIN header field is the Call-ID value, the FROM tag value, and the To Tag value of the session of the terminal 1 and the terminal 2.

 Step 819: The service control point/service edge proxy sends an ICA message to the service switching point.

 Step 820: The service control point/service edge proxy sends a RequestReportBCSMEvent message to indicate subsequent call messages on the end office SSP.

 Step 821: The service switching point sends a SETUP message to the terminal 3.

 Step 822: The terminal 3 sends an Altering message to the service switching point.

 Step 823: The terminal 3 sends a Connect message to the service switching point.

 Step 824: The service switching point sends an EventReportBCSM message to the service control point/service edge proxy to report the Connect message. The Service Control Point/Business Edge Agent sends a Continue message to the Service Switching Point.

 Step 825: The service control point/service edge proxy sends a 200 message to the IMS application server. Step 826: The service control point/service edge proxy sends a MergeLeg message to the service switching point, and adds the terminal 3 to the session of the terminal 1 and the terminal 2.

 FIG. 9 shows a control flow of a short message. In the control flow of the short message, the service edge proxy uses the short message primitive between the SCP and the SSP to implement the short message control function. As shown in FIG. 9, the short message is described below. Control process.

 Step 901: The calling terminal sends a short message request message to the service switching point.

 Step 902: The service switching point sends an InitiateDPSMS primitive to the service control point/service edge proxy.

 Step 903: The service control point/service edge proxy sends a RequestReportSMSEvent message to the service switching point, and the end office service switching point reports the subsequent information.

Step 904: The service control point/service edge proxy determines the address information of the destination IMS application server. Step 905, the service control point/service edge proxy sends a MESSAGE elimination step 906 to the IMS application server, and the IMS application server performs the comic control. Possible control package for short messages This includes, but is not limited to, modifying the short message center address, modifying the short message to receive the short number information, and rejecting the short message according to certain policies.

 For the MT process of the short message, the IMS application server may also modify the short message center address information, modify the short message receiving number information, and reject the short message control.

 Step 907: The IMS application server sends a MESSAGE message to the service switching point/business edge agent.

 Step 908: The service switching point/service edge proxy sends a ConnectSMS message to the service switching point, indicating the next hop address information of the short message.

 Step 909: The service switching point sends a MAP-Forward-Short-MESSAGE (ForwardSMS) message to the short message center.

 Step 910: The short message center sends a response message to the service switching point.

 Step 911: The service switching point sends an EventReportSMS message to the service control point/service edge agent to notify that the short message is sent successfully.

 Step 912: The service switching point/service edge agent sends a 200 OK message to the IMS application server. Step 913: The IMS application server sends a 200 OK message to the calling service switching point/service edge proxy.

 Step 914: Send a short message to the calling party to send a success message.

 Embodiment 4 This embodiment shows a process of collecting business information and transmitting business logic control instructions through USSD (Unstructured Supplementary Service Data). When the physical location of the service edge proxy is set in the end office of the circuit switched network, the tandem office, or the location of the SCP of the intelligent network, the information related to the USSD is collected through the UE and the service logic control command is transmitted. . As shown in Figure 10, the following describes the process by which the service edge agent collects service information through the USSD and passes the business logic control instructions.

 Steps 1001-1014, terminal 1 and terminal 2 establish a call.

Step 1015: The terminal 1 wishes to perform call hold, and transmits the information to the MSC/Service Edge Agent through the USSD with the end office. Step 1016: The MSC/Service Edge Agent sends an INVITE message to the IMS application server, where the message carries call hold information.

 Step 1017: The IMS application server sends a 200 OK message to the MSC/Service Edge Agent.

 Step 1018: The call control function entity of the MSC performs related media control.

 Step 1019: The MSC/Service Edge Agent replies to the terminal 1 with a USSD response message.

 Step 1020: The IMS application server performs the call recovery function of the terminal 1 according to the control of the service logic.

 Step 1021: The IMS application server sends an INVITE message to the MSC/service edge proxy. The INVITE message carries call recovery information.

 Step 1022: The MSC/Service Edge Agent sends an USSD message to the terminal 1, where the USSD message carries call recovery information.

 Step 1023: The terminal 1 replies to the MSC/Service Edge Agent with a USSD response message.

 Step 1024: The MSC/Service Edge Agent replies with a 200 OK message to the IMS application server.

 In accordance with the present invention, circuit switched network users can be made to use IMS network services.

 While the invention has been described by the embodiments of the invention in the embodiments of the invention Request to limit.

Claims

Rights request A service edge proxy, configured to implement an IMS (IP Multimedia Subsystem) network to provide services to a circuit switching network, and the method includes:  a circuit domain signaling processing module, configured to process a service request message of a circuit switched network call control function entity;  The service trigger detection module is configured to perform IMS network service trigger detection on the service request message according to the subscription data;  The IMS signaling processing module is configured to map the service request message triggered by the service trigger detection module to the service request message of the IMS network, and then send the mapped service request message of the IMS network to the IMS application server; The IMS signaling processing module controls the call control function entity of the circuit switching network to perform subsequent service flow control by the circuit domain signaling processing module according to the received service control message of the IMS application server.  2. A system for providing services to a circuit switched network by an IMS network, wherein the system comprises:  The home subscriber network server is configured to store the subscription data of the circuit switched network user in the IMS network; the circuit switching network call control function entity is configured to trigger the service detection to the service edge proxy, and then pass the service request message that detects the successful triggering through the first The interface is sent to the service edge proxy; and the subsequent service control information sent by the service edge proxy is received for subsequent service and call control; and the service edge proxy is configured to receive the service request message of the circuit switched network call control function entity by using the first interface. And performing IMS network service trigger detection on the service request message of the circuit switched network according to the subscription data in the home subscriber network, and then mapping the successfully triggered service request message to the service request message of the IMS network, and mapping through the second interface The service request message of the IMS network is sent to the IMS application server; the service edge agent further receives the service control message of the IMS application server through the second interface, and then controls the call control function entity of the circuit switched network through the first interface. Subsequent service process control; The IMS application server is used to implement control of the IMS network service logic. 3. A system for providing services to a circuit switched network by an IMS network according to claim 2, wherein:  The service edge proxy is disposed at an end office or gateway of the circuit switched network; the first interface employs an internal interface between the service edge proxy and the circuit switched network call control entity.  4. A system for providing services to a circuit switched network by an IMS network according to claim 2, wherein:  The service edge proxy is set at a service control point of the circuit switched network intelligent network, and the first interface adopts a CAP/INAP signaling interface.  The system for providing services to the circuit switched network by the IMS network according to claim 2, wherein the second interface is connected to the SIP signaling between the service edge proxy and the IMS application server.  6. The system of claim 2, wherein the service edge agent comprises:  a circuit domain signaling processing module, configured to process a service request message of a circuit switched network call control function entity;  The service trigger detection module is configured to perform IMS network service trigger detection on the service request message according to the subscription data;  The IMS signaling processing module is configured to map the service request message triggered by the service trigger detection module to the service request message of the IMS network, and then send the mapped service request message of the IMS network to the IMS application server; The IMS signaling processing module controls the call control function entity of the circuit switching network to perform subsequent service flow control by the circuit domain signaling processing module according to the received service control message of the IMS application server.  The system for providing services to the circuit-switched network by the IMS network according to claim 2, wherein the system further comprises: The home location register is configured to store the address information of the service edge proxy, and obtain the address information of the service edge proxy from the home location register when the circuit switching network call control function entity successfully triggers the service. A method for the IMS network to provide services to the circuit-switched network, the method comprising: the circuit-switched network call control function entity performs service trigger detection, and sends a service request message to the service edge agent after the triggering succeeds;  The service edge proxy maps the service request message in the circuit switched network to the service request message of the IMS network, and forwards the mapped service request message to the IMS application server;  The service edge proxy controls the subsequent service flow of the circuit switched network control function entity according to the received service control message of the IMS application server.  The method for providing services to a circuit switched network by the IMS network according to claim 8, wherein the step of the circuit switching network call control function entity performs service trigger detection, and after the trigger is successful, sends a service request to the service edge proxy. The message further includes: the call control function entity of the circuit switched network performs service trigger detection, and if the service triggers successfully, obtains the address information of the service edge proxy from the home location register, or obtains the address information of the service edge proxy according to the local data configuration, and then according to the service The address information of the edge proxy sends a service request message to the service edge proxy.  10. The method of claim 8, wherein the step of the service edge proxy maps the service request message in the circuit switched network to the service request message of the IMS network, and Forwarding the mapped service request message to the IMS application server, so that the IMS application server performs the service logic control further includes: the service edge agent obtains the subscription data from the home subscription user server; and triggers detection on the service of the IMS according to the subscription data, when the service is triggered Upon success, the service edge proxy maps the service request message in the circuit switched network to the service request message of the IMS network, and forwards the mapped service request message of the IMS network to the application server of the IMS network.  11. The method of claim 8, wherein the service edge proxy is disposed in an end office or a gateway of a circuit switched network, and the circuit switched network call control The functional entity sends a service request to the service edge proxy through the first interface. 12. The method of claim 1, wherein the first interface uses a service edge proxy and a circuit switched network call control entity. Interface.  13. The method of interworking between a circuit switched network and an IMS network according to claim 8, wherein the service edge proxy is located at a service control point of the circuit switched network intelligent network, and the first interface uses a CAP/INAP signaling interface.  The method for providing a service to a circuit switched network by the IMS network according to any one of claims 8 to 13, wherein the service request message comprises any combination of any one or more of the following messages: Basic call message, network call message, short message message, multi-connection control message, and/or service information collection request message.  The method for the IMS network to provide services to the circuit switched network according to claim 8, wherein the method for the service edge agent to obtain the service message in the circuit switched network further comprises: the service edge proxy intercepting the mobile switching center Control signaling with the home location register.