WO2009015532A1

WO2009015532A1 - A method for communication forwarding of user power off with ip multimedia subsystem centralized service

Info

Publication number: WO2009015532A1
Application number: PCT/CN2007/003663
Authority: WO
Inventors: Shilin You; Zhenwu Hao; Jiyan Cai
Original assignee: Zte Corporation
Priority date: 2007-08-01
Filing date: 2007-12-18
Publication date: 2009-02-05

Abstract

A method for communication forwarding of user power off with IP multimedia subsystem (IMS) centralized service is disclosed. It includes: the visited mobile switch centre (VMSC) (102) finds the called user power off, then transmits the mobile application part (MAP) error responding message with the power off reason value of the called user to the IMS circuit switched control function (ICCF) unit (106) after the ICCF unit (106) transmits the switched calling request message to the VMSC (102); the ICCF unit (106) maps the MAP error responding message to the session initiation protocol (SIP) responding message with the power off reason value ofthe called user, and transmits the SIP responding message to the telecom application server (TAS) (108); the TAS (108) controls the trigger of the communication forwarding service of power off according to the called user reason value in the SIP responding message. The judgement of power off or not can be processed by the home subscriber server (103).

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular, to a method for shutting down a service of a centralized user of an IP multimedia subsystem. BACKGROUND OF THE INVENTION The Internet Protocol (IP) Multimedia Subsystem (IMS) is an IP-based one proposed by the 3rd Generation Partnership Project (3GPP). The network architecture, which builds an open and flexible business environment, supports multimedia applications, and provides users with rich multimedia services.

IMS is an IP-based telecommunications network architecture, which has nothing to do with access spoofing, except for GPRS (General Packet Radio Service), WLAN (Wireless Local Area Network), and other packet switching (Packet Switched, referred to as PS) Access network provides services, and can also provide services for mobile cellular networks such as GSM (Global System for Mobile communications) and UMTS (Universal Mobile Telecommunications System).

Mobile cellular networks such as GSM and UMTS use circuit switching technology, called Circuit Switched (CS) domain, to provide basic voice services and supplementary services based on voice services. When the CS domain accesses the IMS, it evolves into an access mode. The service is completely provided by the IMS. This technology is called IMS Centralized Service (ICS).

The IMS centralized service has the following advantages:

(1) IMS provides consistent services for access modes such as circuit switched domain and packet switched domain, and supports network convergence; (2) supports CS network to evolve to IMS network;

(3) Support not only ICS-capable user equipment, but also existing ICS-capable user equipment. 1 is a schematic diagram of a session path of an IMS centralized service application scenario, including the following network elements: User Equipment (User Equipment, UE for short), Visited Mobile Switch Center (VMSC), and Home Subscriber Server 103 ( Home Subscriber Server (HSS), Media Gateway Control Function 104 (MGCF unit), Media Gateway 105 (Media Gateway, MGW for short), IMS CS Control Function (abbreviation) The ICCF unit), the Call Session Control Function 107 (CSCF unit) and the Telecom Application Server (TAS).

The UE 101 to the ICCF unit 106 of the IMS domain establishes three paths: a session control path, a bearer control path, and a bearer path. The session control path is carried on the CS domain, and the Unstructured Supplementary Service Data (USSD) is used. The path passes through the VMSC 102 and the HSS 103. Bearer Control Path The UE 101 accesses the VMSC 102 using standard CS control signaling and accesses the IMS through the MGCF unit 104 to the ICCF unit 106 via the CSCF unit 107. The bearer path is that the UE 101 accesses the IMS through the VMSC 102 and the MGW 105 and establishes a media connection with the remote user equipment of the session.

The IMS centralized service uses the session control path to exchange session control information between the UE 101 and the ICCF unit 106, and establishes and controls the media bearer through the bearer control path. The ICCF unit 106 acts as an IMS user agent instead of the user equipment to access the IMS.

TAS 108 is a telecom application server in IMS, and the basic services of telecommunications are implemented in TAS. At present, there are two ways to establish an ICS called service for an ICS UE: One is that when a called request initiated from the calling side arrives at the ICCF unit, the ICCF unit allocates an ICCF address, and the ICCF address is brought to the USSD through the session control path USSD. The called number, initiated by the called number ICS UE, initiates the calling process to establish a bearer called to the ICCF unit. Another way is that the ICCF unit obtains the roaming number of the called number, and the ICCF unit relies on roaming number routing to establish the bearer to the called unit from the ICCF unit. Figure 2 shows two ways to establish an ICS called service. As shown in Figure 2, the following processing is included:

201. The CSCF unit receives the called request service initiated by the calling side. 202. The CSCF unit forwards the called request to the ICCF unit after passing the TAS according to the initial filtering criterion.

203. The ICCF unit sends a USSD called request message to the called terminal on the session control path, where the session control path reaches the called UE through the HSS and the VMSC; and the method of establishing the ICCF unit to the called UE is called:

A1, the called UE initiates a calling process to the ICCF address to the VMSC;

A2, the VMSC initiates an integrated digital service user part ISDN User Part (ISUP) initial address message to the MGCF unit through the ICCF address routing;

A3, the MGCF unit converts the ISUP initial address message, and initiates a session request message of the SIP (Session Initiation Protocol) through the ICCF address routing, through the CSCF unit to the ICCF unit; establishing the ICCF unit to the called UE called the flow mode 2 :

Bl, the ICCF unit obtains the roaming number of the called number;

B2, the ICCF unit routes through the roaming number, and sends a SIP session request to the MGCF unit through the CSCF unit;

B3, the MGCF unit converts the SIP session request into an initial address message of the ISUP to the VMSC;

B4, the VMSC initiates a call setup to the called UE, and pages the called UE; the called procedure of the ICS UE can be established by using the above two methods. The mobile user shuts down the forward service: When the called user B signs the user to the user C to turn off the service, the user B shuts down, the shutdown information is saved in the visit location register (VLR), and the calling user A calls B. The gateway exchange office (GMSC) initiates a routing request to the home location register (HLR), and the HLR initiates a roaming number request to the VLR. When the VLR finds that the user is shut down, the VLR tells the HLR that the roaming number cannot be requested, the user shuts down, and the shutdown information received by the HLR will be The forwarding information is sent to the GMSC, and the GMSC initiates a call to the forwarding user C according to the received forwarding information. In addition, the VLR determines that the mobile user is turned off. There are two cases: First, the user shuts down normally and notifies the VLR; Second, the user is inactive, and the VLR sets the state of the user to the shutdown state through a timer. In the prior art, the User Forwarding Not Logged-in (CFNL) in the IMS domain performs processing in the AS (Application Server), which requires the call session control function unit to know the IMS terminal. The registration status is notified to the AS through a third-party registration, and the AS performs the forwarding service. In the existing IMS centralized control service, the IMS domain does not know the shutdown status of the ICS UE. In particular, it is difficult for the VLR to set the inactive user to the shutdown state. Therefore, the CS service user is turned off by the prior art. Control in the IMS domain is also very difficult to implement. SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to provide a method for shutting down a centralized service user of an IP multimedia subsystem, and realizing the control of the CS service user to switch to the IMS i or before shutting down. In order to solve the above problem, the present invention provides a method for shutting down a centralized service user of an IP multimedia subsystem, including the following steps: a. The IP multimedia subsystem circuit domain control function unit sends the converted called request message to the visit. The mobile switching center; b, visits the mobile switching center to find that the called user is shut down, sends a mobile application partial error response message to the IP multimedia subsystem circuit domain control function unit, and the mobile application partial error response message carries the called user shutdown reason value; c. The IP multimedia subsystem circuit domain control function unit maps the mobile application part error response message to a session initial protocol response message, and the session initial protocol response message carries the called user shutdown cause value, and delivers the session initial protocol response message to the telecommunication application server; The telecommunication application server controls the triggering of the shutdown forwarding service according to the called user shutdown reason value carried in the session initial protocol response message. Further, the method may further include that, in step a, the call session control function unit receives the called request message on the calling side, and sends the called request message to the IP multimedia according to the initial filtering criterion. The subsystem circuit domain controls the functional unit. Further, the above method may further include, in step a, the IP multimedia subsystem circuit domain control function unit converts the called request message into an unstructured supplementary service data called request message, which is not The structured supplementary service data called request message is sent to the visited mobile switching center via the home subscriber server. Further, the above method may further include: the called request message carries the called user number information. Further, the method may further include: in step b, the mobile switching center visits the state of the stored called user according to the visited location register, that is, the paging is sent to the called user terminal according to the called number, and the called party is found. The user shuts down. Further, the above method may further include, in step b, the visited mobile switching center sends a mobile application partial error response message to the IP multimedia subsystem circuit domain control function unit on the session control path. Further, the above method may further include that the user shutdown cause value includes an absent user. Further, the foregoing method may further include, in step c, the session initial protocol response message is a session initiation protocol 503 message, indicating that the user is shut down. Further, the method may further include, in step c, the IP multimedia subsystem circuit domain control function unit transmits the session initial protocol response message to the telecommunication application server through the call session control function unit; the telecommunication application server responds to the message according to the session initial protocol. The value of the called user's shutdown reason is controlled to trigger the shutdown of the forwarding service. The present invention also provides another IP multimedia subsystem centralized service user shutdown forward method, the following steps, al, IP multimedia subsystem circuit domain control function unit sends the converted called request message to the home user ^ Bl, the home subscriber server finds that the called subscriber is shut down, sends a mobile application partial error response message to the IP multimedia subsystem circuit domain control function unit, and the mobile application partial error response message carries the called subscriber shutdown reason value; cl, IP multimedia The subsystem circuit domain control function unit maps the mobile application part error response message to a session initial protocol response message, and the session initial protocol response message carries the called user shutdown cause value, and delivers the session initial protocol response message to the telecommunication application server; The server controls the triggering of the shutdown forwarding service according to the called user shutdown reason value carried in the session initial protocol response message. Further, the step a1 further includes: after receiving the called request message on the calling side, the call session control function unit sends the called request message to the IP multimedia subsystem circuit domain control function according to the initial filtering criterion. unit. Further, in step a1, the IP multimedia subsystem circuit domain control function unit converts the called request message into an unstructured supplementary service data called request message, and sends the unstructured supplementary service data called request message to the home subscriber server. . Further, in step bl, the home subscriber server sends a mobile application partial error response message to the IP multimedia subsystem circuit domain control function unit on the tongue control path. Further, it is characterized in that the user shutdown cause value includes an absent user. Further, in the step cl, the session initial protocol response message is a session initiation protocol 503 message, indicating that the user is shut down. Further, in step cl, the IP multimedia subsystem circuit domain control function unit transmits the session initial protocol response message to the telecommunication application server through the call session control function unit; the telecommunication application server responds according to the session initial protocol. The called user's shutdown reason value carried in the message controls the triggering of the shutdown forwarding service. Compared with the prior art, the IMS domain does not need to obtain the shutdown state of the ICS UE when the CS is accessed, and the implementation of the shutdown service of the user of the IMS centralized service terminal is completed. Other features and advantages of the invention will be set forth in the description which follows, and The objectives and other advantages of the invention will be realized and attained by the <RTI The drawings are intended to provide a further understanding of the invention, and are intended to be a part of the description of the invention. In the drawings: FIG. 1 is a schematic diagram of a current IMS centralized service application scenario session path; FIG. 2 is a flow chart of a prior art ICS service implementing user shutdown forwarding; FIG. 3 is an IP multimedia sub-invention according to an embodiment of the present invention. System centralized business users Flowchart of the method Embodiment 1 FIG. 4 is a second embodiment of a flowchart of a method for shutting down a centralized service user of an IP multimedia subsystem according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. In a specific embodiment of the present invention, after the called request message is sent to the CSCF unit, the CSCF unit sends the called request message to the ICCF unit according to the initial filtering criterion, and the ICCF unit converts the called request message to the USSD called request message. The called request message carries the called number information, and transmits the USSD called request message to the VMSC through the HSS; if the USSD called request message is transmitted to the HSS, the HSS finds that the user is shut down, and the HSS will carry the MAP error of the user's shutdown reason. The response message is delivered to the ICCF unit, or the USSD called request message arrives at the VMSC, and the VMSC finds that the user is shut down, and the VMSC transmits the MAP (Mobile Application Part) error response message carrying the user shutdown reason value to the ICCF unit in the session control path; ICCF The unit maps the SIP response message carrying the user shutdown reason value to the TAS, and the TAS triggers the user to turn off according to the user shutdown reason value carried in the SIP response message. FIG. 3 illustrates a first embodiment of a method for shutting down a centralized operation of an IP multimedia subsystem in a specific embodiment of the present invention, including the following steps. Step 301: The call session control function unit receives the caller's side. Calling the request message; Step 302, the call session control function unit sends the called request message to the IMS circuit domain control function unit via the telecommunication application server; the call session control function unit passes the called request message to the telecommunication application server according to the initial filtering criterion. Send to the IMS circuit domain control function unit. Step 303: The IMS circuit domain control function unit sends the converted called request message to the visited mobile switching center. The IMS circuit domain control function unit converts the called request message into a USSD (Unstructured Supplementary Service Data) called request message. The called request message carries the called subscriber number information and the ICCF information, and the USSD called request message is sent to the visited mobile switching center via the home subscriber server. Step 304: The visited mobile switching center detects that the called user is powered off according to the stored state of the called user in the visited location register. Step 305: Send a mobile application partial error response message to the IMS circuit i or the control function unit, and the mobile application part error response The message carries the shutdown cause value; the visited mobile switching center sends a mobile application partial error response message to the IMS circuit domain control function unit on the session control path, and the mobile application partial error response message carries the user shutdown cause value. The user shutdown reason value indicates the cause of the user's shutdown error and can be an absent user. Step 306, the IMS circuit domain control function unit maps the mobile application part error response message to a session initial protocol response message, the session initial protocol response message carries the user shutdown reason value, and delivers the session initial protocol response message to the telecommunication application server;

The IMS circuit domain control function unit maps the mobile application part error response message to the session initial protocol response message, indicating that the user is shut down, the session initial protocol response message carries the user shutdown reason value, and transmits the session initial protocol response message through the call session control function unit. To the telecom application server. The Session Initiation Protocol Response message may be a Session Initiation Protocol 503 message indicating that the user is down. Step 307: The telecommunication application server controls the triggering of the shutdown forwarding service according to the value of the user shutdown reason carried in the session initial protocol response message. In some cases, when the user is inactive for a long time, the VLR is considered to be powered off. After a period of time, the VLR deletes the user data and notifies the HSS that the user is shut down. FIG. 4 is a second embodiment of a method for shutting down a centralized operation of an IP multimedia subsystem in a specific embodiment of the present invention. In this example, the HSS determines that the user is shut down, and includes the following steps: Step 401 The call session control function unit receives the called party request message on the calling side; step 402, the call session control function unit sends the called request message to the IMS circuit domain control function unit via the telecommunication application server; the call session control function unit The initial filtering criteria will be called by the request message through the telecommunications With the server, send to the IMS circuit domain control function unit. Step 403: The IMS circuit domain control function unit sends the converted called request message to the home subscriber server.

The IMS circuit domain control function unit converts the called request message into a USSD (Unstructured Supplementary Service Data) called request message, and the called request message carries the called subscriber number information and ICCF information, and sends the USSD called request message to the home subscriber. server. Step 404: The home subscriber server finds that the called subscriber is powered off. Step 405: The home subscriber server sends a mobile application partial error response message to the IMS circuit domain control function unit, and the mobile application partial error response message carries a shutdown reason value; the home subscriber server is in session control. A mobile application partial error response message is sent to the IMS circuit domain control function unit on the path, and the mobile application partial error response message carries the user shutdown cause value. The user shutdown reason value indicates the cause of the user's shutdown error and can be an absent user. Step 406: The IMS circuit domain control function unit maps the mobile application part error response message to a session initial protocol response message, where the session initial protocol response message carries the user shutdown reason value, and delivers the session initial protocol response message to the telecommunication application server;

The IMS circuit domain control function unit maps the mobile application part error response message to the session initial protocol response message, indicating that the user is shut down, the session initial protocol response message carries the user shutdown reason value, and transmits the session initial protocol response message through the call session control function unit. To the telecom application server. The Session Initiation Protocol Response message may be a Session Initiation Protocol 503 message indicating that the user is down. Step 407: The telecommunication application server controls the triggering of the shutdown forwarding service according to the value of the user shutdown reason carried in the session initial protocol response message. The method of the specific embodiment of the present invention is that the IMS domain does not need to obtain the shutdown state of the ICS UE when the CS is accessed, and the user turns off the forwarding service of the IMS centralized service terminal. The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A method for shutting down a user of an IP multimedia subsystem centralized service, characterized in that it comprises the following steps:

a. The IP multimedia subsystem circuit domain control function unit sends the converted called request message to the visited mobile switching center;

b. Visiting the mobile switching center to find that the called user is shut down, and sending a mobile application partial error response message to the IP multimedia subsystem circuit domain control function unit, where the mobile application partial error response message carries the called user shutdown reason value;

c. The IP multimedia subsystem circuit domain control function unit maps the mobile application part error response message to a session initial protocol response message, where the session initial protocol response message carries the called user shutdown cause value, and the session initial protocol is The response message is delivered to the telecommunication application server; the telecommunication application server controls the triggering of the shutdown forwarding service according to the called user shutdown reason value carried in the session initial protocol response message.

2. The method according to claim 1, wherein the step a further comprises

After receiving the called request message on the calling side, the call session control function unit sends the called request message to the IP multimedia subsystem circuit domain control function unit according to the initial filtering criterion.

3. The method according to claim 1, wherein in the step a, the IP multimedia subsystem circuit domain control function unit converts the called request message into an unstructured supplementary service data called request message. And sending the unstructured supplementary service data called request message to the visited mobile switching center via the home server.

The method according to claim 3, wherein the called request message carries the called subscriber number information.

The method according to claim 1, 2, 3 or 4, wherein in the step b, the visited mobile switching center sends a mobile application to the IP multimedia subsystem circuit domain control function unit on the session control path. Partial error response message.

6. The method according to claim 1, 2, 3 or 4, wherein the user shutdown cause value packet 4 is absent from the user.

The method according to claim 1, 2, 3 or 4, wherein in the step c, the session initial protocol response message is a session initiation protocol 503 message, indicating that the user is shut down. -

The method according to claim 1, 2, 3 or 4, wherein in the step c, the IP multimedia subsystem circuit domain control function unit sends the initial protocol response message to the call The session control function unit is delivered to the telecommunication application server; the telecommunication application server controls the triggering of the shutdown forwarding service according to the called user shutdown reason value carried in the session initial protocol response message.

9. A method for shutting down a user of an IP multimedia subsystem centralized service, characterized in that it comprises the following steps,

Al, the IP multimedia subsystem circuit domain control function unit sends the converted called request message to the home subscriber server;

Bl, the home subscriber server finds that the called user is shut down, and sends a mobile application partial error response message to the IP multimedia subsystem circuit domain control function unit, where the mobile application part error response message carries the called user shutdown reason value;

The IP multimedia subsystem circuit domain control function unit maps the mobile application part error response message to a session initial+office response message, where the session initial protocol response message carries the called user shutdown reason value, and the session is The initial protocol response message is delivered to the telecommunication application server; the telecommunication application server controls the triggering of the shutdown forwarding service according to the called user shutdown reason value carried in the session initial protocol response message.

10. The method according to claim 9, wherein the step al further comprises

After receiving the called request message on the calling side, the call session control function unit sends the called request message to the IP multimedia subsystem circuit domain control function according to the initial filtering criterion. unit.

The method according to claim 9, wherein in the step a1, the IP multimedia subsystem circuit domain control function unit converts the called request message into an unstructured supplementary service data called request message. Transmitting the unstructured supplementary service data called request message to the home subscriber server.

The method according to claim 9, 10 or 11, wherein, in the step bl, the home subscriber server sends a mobile to the IP multimedia subsystem circuit domain control function unit on the session control path. Apply a partial error response message.

13. The method according to claim 9, 10 or 11, wherein the user shutdown cause value comprises an absent user.

The method according to claim 9, 10 or 11, wherein, in the step cl, the session initial protocol response message is a session initiation protocol 503 message, indicating that the user is shut down.

The method according to claim 9, 10 or 11, wherein in the step c1, the IP multimedia subsystem circuit domain control function unit passes the session initial protocol response message through a call session control function. The unit is delivered to the telecommunication application server; the telecommunication application server controls the triggering of the shutdown forwarding service according to the called user shutdown reason value carried in the session initial protocol response message.