SYSTEM AND METHOD FOR PROCESSING PACKET DOMAIN SIGNAL

• US 20070211695A1
• Filed: 03/06/2007
• Published: 09/13/2007
• Est. Priority Date: 09/07/2004
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Zhu, Dongming, Shi, Youzhu
• Granted Patent: US 7,804,820 B2
• Time in Patent Office: Days
• US Class Current: 370/352
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
• CPC Class Codes: H04L 65/1016 IP multimedia subsystem [IMS]
• CPC Class Codes: H04L 65/1043 Gateway controllers, e.g. media gateway control protocol [MGCP] controllers
• CPC Class Codes: H04M 7/123 where the packet-switched network is an Internet Protocol Multimedia System-type network

Abstract

Embodiments of the present invention disclose a system and a method for processing a packet domain service signal, which enable a terminal that does not support an access control protocol of an Internet Protocol Multimedia Subsystem (IMS) to access the IMS and acquire the services in the IMS. An AGCF is added for shielding the differences of the users on the basis of the IMS defined in the 3GPP R5/R6 standard, specifically, a PSTN/ISDN user accesses an AGF first, accesses the IMS through an agent function of the AGCF, and the AGCF also manages and controls the AGF. Control of the PSTN/ISDN services may be implemented in the AGCF, or in an AS added to the IMS, or the control of basic services and supplementary services may be implemented in the AGCF while the control of value-added services may be implemented in the AS.

Claims

1. A system for processing a packet domain service signal, comprising:

an Internet Protocol Multimedia Subsystem (IMS);

at least one access gateway function for implementing a function of conversion between a narrowband voice in a circuit domain and an Internet Protocol (IP) media flow in a packet domain, and a function of conversion between user interface signalling in the circuit domain and call control signalling in the packet domain; and

at least one access gateway control function for implementing access management and call control for the access gateway function, and enabling the user equipment which accesses the access gateway control function through the access gateway function to access a Call Session Control Function (CSCF) in the IMS.

2. The system of claim 1, further comprising a first application server for providing a function of service control of a Public Switched Telephone Network (PSTN)/Integrated Services Digital Network (ISDN) according to service triggering of the CSCF.

3. The system of claim 2, wherein the first application server comprises means for implementing the service control of the PSTN/ISDN including control of a basic service, a supplementary service and an extended value-added service.

4. The system of claim 2, wherein the access gateway control function comprises a sixth module for processing a basic service and a supplementary service of the PSTN/ISDN;

and the first application server comprises means for processing an extended value-added service.

5. The system of claim 1, wherein the access gateway control function comprises a seventh module for generating a charging request according to a requirement defined by a standard of the IMS, and sending the charging request to a charging collection unit in the IMS.

6. The system of claim 1, wherein the access gateway control function comprises a second module for implementing registration and authentication of the access gateway function.

7. The system of claim 1, wherein the access gateway control function comprises a fourth module for converting between Session Initiation Protocol (SIP) and an interface protocol of an interface through which the access gateway control function is connected to the access gateway function;

and a fifth module for obtaining a user identify of a calling user according to an access gateway function identity and a user port identity, or locating an access gateway function and a user port which a called user accesses according to a user identity.

8. The system of claim 7, wherein the interface adopts one of H.248 protocol, Media Gateway Control Protocol, the SIP and the IUA/V5UA over SIGTRAN protocol.

9. A method for processing a packet domain service signal, when a user makes an outgoing call, the method comprising:

transferring a first message to an access gateway control function upon receiving a dialling signal from a user equipment processing a service signal of a Public Switched Telephone Network (PSTN)/Integrated Services Digital Network (ISDN);

upon receiving the first message, obtaining, by the access gateway control function, a user identity according to an identity of the access gateway function and a user port identity, converting the first message to an Session Initiation Protocol (SIP) request message, and sending the SIP message to a Call Session Control Function (CSCF) in an Internet Protocol Multimedia Subsystem (IMS);

implementing, by the CSCF, service triggering according to user subscription information, and sending a second message to a first application server;

upon receiving the second message, implementing, by the first application server, service control of the PSTN/ISDN, and notifying the CSCF to continue to implement session control by a third message.

10. The method of claim 9, wherein the process of continuing to implement the session control comprises:

determining whether the third message received triggers a new service;

if the third message received triggers a new service, triggering the new service and sending a new SIP request message to an application server corresponding to the new service;

otherwise, implementing connection control and routing.

11. The method of claim 10, wherein the process of implementing the connection control and the routing comprises determining whether a called user is in a domain of the IMS;

if the called user is in the domain of the IMS, sending an SIP request message to a Serving Call Session Control Function in a home domain of the called user;

otherwise, sending an SIP request message to a Breakout gateway control function.

12. The method of claim 9, wherein the service control of the PSTN/ISDN comprises control of a basic service, a supplementary service and an extended value-added service.

13. The method of claim 9, further comprising:

before converting the first message to the SIP request message, and sending the SIP request message to the CSCF in the IMS, controlling a basic service and a supplementary service of the PSTN/ISDN;

wherein the service control of the PSTN/ISDN implemented by the first application server comprises control of an extended value-added service.

14. The method of claim 9, wherein the first message adopts one of H.248 protocol, Media Gateway Control Protocol, the SIP and the IUA/V5UA over SIGTRAN protocol.

15. A method for processing a packet domain service signal, when a user makes an incoming call, the method comprising:

upon receiving a Session Initiation Protocol (SIP) request message, triggering, by a Call Session Control Function (CSCF) in a home domain of a called user, a service according to user subscription information, and sending a fourth message to a first application server;

upon receiving the fourth message, implementing, by the first application server, service control of a Public Switched Telephone Network (PSTN)/Integrated Services Digital Network (ISDN), and sending a fifth message to the CSCF;

upon receiving the fifth message, implementing, by the CSCF, connection control and routing, and sending a Session Initiation Protocol (SIP) request message to an access gateway control function;

upon receiving the SIP request message, locating, by the access gateway control function, an access gateway function that a called user accesses and a user port according to a called user identity, converting the SIP request message to a sixth message, and notifying the access gateway function to send an incoming call signal to a user equipment processing a service signal of the PSTN/ISDN.

16. The method of claim 15, wherein the processes of implementing the connection control and the routing, and sending the SIP request message to the access gateway control function comprise:

upon receiving the fifth message, determining whether a new service is triggered;

if the new service is triggered, triggering the new service and sending an SIP request message to an application server corresponding to the new service;

otherwise, implementing the connection control and the routing, and sending an SIP request message to the access gateway control function.

17. The method of claim 15, wherein the service control of the PSTN/ISDN implemented by the first application server comprises control of a basic service, a supplementary service and an extended value-added service.

18. The method of claim 15, wherein the service control of the PSTN/ISDN implemented by the first application server comprises control of an extended value-added service;

upon receiving the SIP request message, the access gateway control function determines whether a basic service and a supplementary service of the PSTN/ISDN are triggered;

if the basic service and the supplementary service are triggered, the access gateway control function controls the basic service and the supplementary service that are triggered, and determines whether to carry out the session control again for the incoming call;

if determining to carry out the session control again for the incoming call, the access gateway control function sends an SIP request message to the CSCF, and the CSCF continues to implement the session control again;

if determining not to carry out the session control again for the incoming call, the incoming call is terminated;

if the basic service and the supplementary service are not triggered, the access gateway control function locates an access gateway function that a called user accesses and a user port according to the called user identity, converts the SIP request message to the sixth message, and notifies the access gateway function to send an incoming call signal to a user equipment processing the service signal of the PSTN/ISDN.

19. The method of claim 15, wherein the sixth message adopts one of H.248 protocol, Media Gateway Control Protocol, the SIP and the IUA/V5UA over SIGTRAN protocol.