WO2008151481A1

WO2008151481A1 - A method for centralized controlling the service to implement the terminal call in a ip multimedia core network subsystem

Info

Publication number: WO2008151481A1
Application number: PCT/CN2007/003340
Authority: WO
Inventors: Zhenwu Hao; Shilin You; Zhendong Li
Original assignee: Zte Corporation
Priority date: 2007-06-15
Filing date: 2007-11-27
Publication date: 2008-12-18
Also published as: CN101325590A; CN101325590B

Abstract

A method for centralized controlling the service to implement the terminal call in a IP multimedia core network subsystem (IMS), includes that: ICCF calls the UE which accessed by the circuit switched (CS) via the session control path and carries its ICCF address assigned after it receives the terminal call request initiated by the calling side; the UE initiates the CS call by using the ICCF address as the called number and establishes the connection between the UE and the ICCF to implement the establishment of the bear control path; and the terminal call is implemented by utilizing the bear control path. This invention can establish the bear control path without the ICCF assigning the roam number, it is a method which can solve the ICS terminal call effectively.

Description

Method for centrally controlling service to realize terminal call by IP multimedia subsystem

Technical field

The present invention relates to an IP multimedia subsystem, and in particular to a method for centrally controlling a service to implement a terminal call by an IP multimedia subsystem.

Background technique

IP (Internet Protocol, IP for short) The Multimedia Subsystem (IMS) is an IP-based network proposed by the 3rd Generation Partnership Project (3GPP). The architecture, which builds an open and flexible business environment, supports multimedia applications and provides users with rich multimedia services.

IMS (IP Multimedia Subsystem) is an IP-based telecommunications network architecture, which is independent of access technology, except for GPRS (General Packet Radio Service), WLAN (Wireless Local Area Network), and other packet-connected devices. In addition to providing services to the network, it 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 users with basic voice services and supplementary services based on voice services. When the CS domain accesses the IMS, it evolves into an access mode, and 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 domain and packet domain, and supports network convergence;

(2) Supporting the evolution of the CS network to the IMS network;

(3) Support not only ICS-capable user equipment, but also existing ICS-capable user equipment.

Figure 1 is an architectural diagram of the IMS centralized control service, including the following network elements: 101 User Terminal User Equipment Referred to as UE

102 Visiting Mobile Switching Center Visited Mobile Switch Center Referred to as VMSC 103 Home Subscriber Server Home Subscriber Server Short for HSS 104 Media Gateway Control Function Media Gateway Control Function Abbreviation MGCF

105 Media Gateway Media Gateway MGW 106 IMS Circuit Domain Control Function IMS CS Control Function Acronym ICCF 107 Call Session Control Function Call Session Control Function CSCF UE-101 establishes 3 paths through VMSC-102 to ICCF-106 in the IMS domain: Session Control path, bearer control path, and bearer path, where:

The session control path uses Unstructured Supplementary Service Data (USSD), and the UE-101 reaches the ICCF-106 through the VMSC-102 and the HSS-103;

The bearer control path, the UE accesses the VMSC by using standard CS control signaling, and accesses the IMS through the MGCF. The VMSC passes the integrated digital service user part signaling (ISUP) to the MGCF-104, and then uses the same. Session Initial Protocol (Session Initial Protocol, SIP) CSCF—107 arrives at ICCF—106;

The bearer path is established by MGW-105.

The session control path transfers session information between the UE 101 and the ICCF 106, and the bearer control path carries the bearer control message between the CS domain and the IMS domain through standard CS control signaling and SIP signaling. Finally, the two control The path is associated with ICCF-106. This function is equivalent to the SIP user agent function of the UE to establish an IMS session. The bearer control path also controls the establishment of the bearer path and the management of the bearer resources.

2 is a terminal call flow of the prior art solution. The specific process is as follows

201. The CSCF receives the called request message on the calling side.

202. The ICCF receives the called request message transmitted from the CSCF.

203. The ICCF obtains the roaming number of the called party.

204. The ICCF notifies the UE that there is a called request through the session control path.

205. The ICCF uses the obtained roaming number to route to the CSCF.

206. The CSCF uses the roaming number to route to the MGCF.

207. The MGCF sends an initial address message of the ISUP to the VMSC. 208. The VMSC initiates a called establishment to the UE.

209. The UE sends a response message to the VMSC.

210. The VMSC sends a response message to the MGCF.

211. The MGCF sends a SIP success response message to the CSCF.

212. The CSCF sends a SIP success response message to the ICCF.

213. The ICCF sends a SIP success response message to the CSCF.

214. The CSCF sends a SIP success response message to the calling side, and enters a call state.

It can be seen from the call flow of the existing call that the terminal call needs to obtain the number of a roaming number when the ICCF establishes the terminating call bearer control path with the VMSC, and establishes the bearer control path with the number of the roaming number and the VMSC. How to get this number and the format of this number is uncertain in the existing process.

In addition, the existing terminating process may require two paging processes, and the call setup time is relatively long.

Summary of the invention

In view of the defects and deficiencies of the prior art, the object of the present invention is to provide a method for centrally controlling a service to implement a terminal call by an IP multimedia subsystem, and using a circuit domain calling process to establish a circuit domain bearer mode to implement an ICS terminal call. . The session connection is established directly between the user UE and the ICCF without going through the process of obtaining the roaming number. To achieve the above objective, the present invention provides a method for centrally controlling a service to implement a terminal call by an IP multimedia subsystem, which is characterized by comprising the following steps:

11) Circuit domain control function After receiving the terminal call request message initiated by the calling side, the ICCF calls the called terminal UE accessed by the circuit domain through the session control path and carries its assigned circuit domain control function ICCF address;

12) After receiving the call of step 11), the called terminal UE initiates a circuit domain call with the circuit domain control function ICCF address as the called number to establish a connection between the called terminal UE and the circuit domain control function ICCF, and completes the bearer. The establishment of a control path;

13) Implementing the termination call by using the bearer control path.

among them,

After receiving the terminal call request message, the ICCF in step 11), according to the obtained called information, The home control server HSS and the visited mobile switching center VMSC establish a session control path to the terminal UE, and the call request message sent by the ICCF to the UE includes the ICCF address, the calling information, and the called information.

Further, step 11) further includes: the called terminal displaying the calling number according to the received calling information.

Step 12) includes:

The UE uses the ICCF address received in step 11) as the called number to establish a call through the bearer control path, and if the UE has the calling intelligent service, the VMSC will not trigger the calling intelligent service according to the ICCF address, where The process is:

The call setup message of the UE is sent to the VMSC, and the VMSC routes the call to the media gateway control function MGCF, and the MGCF passes the call session control function CSCF to the ICCF according to the ICCF address.

Further, step 12) further includes: after the ICCF receives the UE call, associating the session control path with the bearer control path by using the called number ICCF address of the call.

Step 13) includes the following steps:

601) circuit domain control function ICCF uses the bearer control path to send a ringing message to the called terminal UE;

602) circuit domain control function ICCF uses the bearer control path to send ringing to the calling side; 603) after the called terminal UE answers, send a connection message to the circuit domain control function through the session control path;

604) The circuit domain control function ICCF sends the session initial protocol SIP success response message to the calling side by using the bearer control path, and simultaneously returns a success message response message to the called terminal UE by using the bearer control path, and the two parties enter the call state.

Further,

The ICCF in the step 601) sends a ringing message to the media gateway control function MGCF through the call session control function CSCF, and the MGCF converts the ringing message to the UE via the VMSC.

In step 602):

After receiving the call setup request initiated by the UE in step 12), the ICCF directly sends a ringing message to the calling side; or

After receiving the ringing message sent by the UE through the session control path, the ICCF sends the ringing message to the main The calling side sends a ringing message.

Step 604): After receiving the success response, the media gateway MGW on the calling side sends an acknowledgement request to the ICCF; after receiving the successful response, the media gateway control function MGCF on the called side sends a confirmation request to the ICCF; The media gateway MGW on the calling side establishes a bearer connection with the media gateway MGW on the called side, so that the bearer resources of the calling user and the called terminal UE are connected to the call state. The method for the IP multimedia subsystem to control the service to implement the terminating call is provided by the IP multimedia subsystem, and the ICCF address obtained by the UE is used as the called number, and a calling process is established to establish a bearer control path, and the ICCF is not required to obtain the roaming number to establish the bearer. Control path, is a simple and effective solution for ICS termination

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be further described in detail below with reference to the drawings and specific embodiments. 1 is a schematic diagram of a networking architecture of an IMS centralized control service of an IP multimedia subsystem; FIG. 2 is a flow chart of a terminal call of an IMS centralized control service ICS of an existing IP multimedia subsystem; FIG. 3 is an IMS centralized control service ICS of the present invention. Final call flow chart;

4 is a flow chart of another terminal call of the IMS centralized control service ICS of the present invention.

Preferred embodiment of the invention

First, the main innovation of the present invention is that the session connection is established directly between the user UE and the ICCF without going through the process of obtaining the roaming number.

Second, FIG. 3 is an implementation process of the present invention, and the specific steps are:

301. The CSCF receives a session initial protocol SIP session request on the calling side.

302, the ICCF receives a SIP session request forwarded by the CSCF;

303, the ICCF determines, by the acquired called information, that the called UE is an ICS-enabled UE, allocates an ICCF address, and passes the session control path, that is, USSD, to the called UE through the HSS and the VMSC; 304. After receiving the called request message, the UE immediately treats the ICCF address as the called number, and initiates call setup to the VMSC.

305. The VMSC analyzes the ICCF address and sends an initial address message to the MGCF. If the UE has a calling smart service, the VMSC will not trigger the calling smart service of the UE according to the ICCF address;

306. The MGCF routes to the CSCF according to the ICCF address.

307, the CSCF is routed to the ICCF according to the ICCF address;

308, the ICCF associates the session request of step 302 with the session request of step 307, and sends a ringing message to the CSCF;

309. The CSCF returns a ringing message to the MGCF.

310, the MGCF returns an address full message to the VMSC;

311. The VMSC sends a ringing message to the UE.

312, the UE starts ringing, and sends a ringing message to the ICCF through the session control path;

313, ICCF notifies CSCF to ring;

314, the CSCF notifies the calling side to ring;

315. After the UE answers, the UE also sends a connection message to the ICCF through the session control path.

316, the ICCF sends a SIP success response message to the CSCF;

317. The CSCF sends a SIP success response message to the calling side.

318, the ICCF sends a success response message to the UE, and the message is first sent to the CSCF;

319. The CSCF forwards the SIP success response message to the MGCF.

320. The MGCF returns an ISUP response message to the VMSC serving the terminating UE.

321. The VMSC sends a connection message to the terminating UE.

322, the calling side sends a SIP confirmation message to the CSCF;

323, the CSCF sends a SIP confirmation message to the ICCF;

324. The MGCF sends a SIP acknowledgement message to the CSCF.

325. The CSCF sends a SIP confirmation message to the ICCF, so that the call state is entered. Third, an implementation of another simplified process of the present invention, as shown in FIG. 4, includes the steps of:

401. The CSCF receives a session initial protocol SIP session request on the calling side.

402. The ICCF receives a SIP session request forwarded by the CSCF.

403. The ICCF determines, by using the obtained called information, that the called party is an ICS-capable UE, allocates an ICCF address, and sends the ICCF address to the called UE through the HSS and the VMSC through the session control path, that is, the USSD.

404. After receiving the called request message, the UE immediately treats the ICCF address as the called number, and initiates call setup to the VMSC.

405. The VMSC analyzes the ICCF address and sends an initial address message to the MGCF. If the UE has a calling smart service, the VMSC will not trigger the calling smart service of the UE according to the ICCF address;

406. The MGCF routes to the CSCF according to the ICCF address.

407, the CSCF is routed to the ICCF according to the ICCF address;

408, the ICCF associates the session request of step 302 with the session request of step 307, and sends a ringing message to the CSCF;

409, the CSCF notifies the calling side to ring;

410, the CSCF returns a ringing message to the MGCF.

411. The MGCF returns an address full message to the VMSC.

412. The VMSC returns a ringing message to the UE.

413. After the UE answers, the UE also sends a connection message to the ICCF through the session control path.

414. The ICCF sends a SIP success response message to the CSCF.

415. The CSCF sends a SIP success response message to the calling side.

416, the ICCF sends a success response message to the UE, and the message is first sent to the CSCF;

417. The CSCF forwards the SIP success response message to the MGCF.

418. The MGCF returns an ISUP response message to the VMSC serving the terminating UE.

419. The VMSC sends a connection message to the terminating UE.

420, the calling side sends a SIP acknowledgement message to the CSCF; 421, the CSCF sends a SIP confirmation message to the ICCF.

422. The MGCF sends a SIP acknowledgement message to the CSCF.

423, the CSCF sends a SIP confirmation message to the ICCF, so that the call state is entered.

Finally, it can be seen from the above process that the ICS UE call flow is implemented by adopting the method of the present invention.

It is a matter of course that the invention may be embodied in various other forms without departing from the spirit and scope of the invention.

Claims

Claim

A method for centrally controlling a service to implement a terminal call by an IP multimedia subsystem, characterized in that the method comprises the following steps:

11) The circuit domain control function (106), after receiving the terminal call request message initiated by the calling side, calls the called terminal (101) accessed by the circuit domain through the session control path and carries the circuit domain control function address allocated by itself;

12) The called terminal (101) initiates a circuit domain call with the circuit domain control function address as the called number to initiate a connection between the called terminal (101) and the circuit domain control function (106), and completes the establishment of the bearer control path. ;

13) Implementing the termination call by using the bearer control path.

2. The method according to claim 1, wherein in step 11), after receiving the terminal call request message, the circuit domain control function (106) moves through the home subscriber server (103) and the visited call according to the obtained called party information. The switching center (102) establishes a session control path to the called terminal (101), and the circuit domain control function (106) sends a call request message to the called terminal (101) including the circuit domain control function address, the calling information, and the Call information.

The method according to claim 1, wherein the step 11) further comprises: the called terminal (101) displaying the calling number according to the received calling information.

The method according to claim 1, wherein the step 12) is further divided into: the called terminal (101) uses the circuit domain control function address received in step 11) as the called number, and performs bearer control. The path establishes a call, and if the called terminal has a calling intelligent service, the visiting mobile switching center (102) does not trigger the calling intelligent service according to the circuit domain control function address, wherein the establishing process is:

The call setup message of the called terminal (101) is sent to the visited mobile switching center (102), and the call is routed to the media gateway control function (104) by the visited mobile switching center (102), and the media gateway control function (104) is based on the circuit domain. The control function address passes the call session control function (107) to the circuit domain control function (106).

The method according to claim 1, wherein the step 12) further comprises: after receiving the called terminal (101) call by the circuit domain control function (106), using the called number circuit domain control function of the call The address associates the session control path with the bearer control path.

6. The method according to claim 1, wherein the step 13) comprises the following steps:

601) The circuit domain control function (106) returns a ringing message to the called terminal (101) by using the bearer control path;

602) the circuit domain control function (106) transmits the ringing to the calling side by using the bearer control path; 603) after the called terminal (101) answers, sends a connection message to the circuit domain control function (106) through the session control path;

604) The circuit domain control function (106) sends a session initial protocol success response message to the calling side by using the bearer control path, and returns a success message response message to the called terminal (101) by using the bearer control path, and the two parties enter the session. Call status.

7. The method according to claim 6, wherein the circuit domain control function (106) in step 601) sends a ringing message to the media gateway control function (104) through a call session control function (107), and the media gateway control function (104) After the conversion, the mobile switching center (102) is called to ring the message to the called terminal (101).

8. The method according to claim 6, wherein in step 602): the circuit domain control function (106) directly contacts the calling party after receiving the call setup request initiated by the called terminal (101) in step 12) The side sends a ringing message; or, the circuit domain control function (106) sends a ringing message to the calling side after receiving the ringing message sent by the called terminal (101) through the session control path.

The method according to claim 6, wherein in step 604): after receiving the successful response, the media gateway on the calling side sends a confirmation request to the circuit domain control function (106); After receiving the successful response, the media gateway control function (104) sends an acknowledgement request to the circuit domain control function (106); the media gateway on the calling side establishes a bearer connection with the media gateway (103) on the called side, thereby connecting The bearer resources of the calling user and the called terminal (101) enter a call state.