CN102420803A - Method and system for accessing termination call through visited IMS (IP Multimedia System) access point - Google Patents
Method and system for accessing termination call through visited IMS (IP Multimedia System) access point Download PDFInfo
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Abstract
The invention discloses a method for accessing a termination call through a visited IMS (IP Multimedia System) access point. The method comprises the following steps: when an SCC AS (Service Centralization and Continuity Application Server) receives a call request to a called subscriber and ascertains that the called subscriber is accessed at a CS (Circuit Switch) domain, the SCC AS obtains identification information of the called subscriber CS domain and calls the called subscriber via a PS (Packet Switch) domain, and a calling massage carries identification information of the called subscriber CS domain; and a VICP (Virtual International Connecting Point) calls the called subscriber via the CS domain according to the identifier of the called subscriber CS domain, carried in the calling massage. The invention also discloses a system for accessing the termination call through the visited IMS (IP Multimedia System) access point, which is used for implementing the method. According to the invention, occupation to CS long-distance link resource is reduced to a certain extent.
Description
Technical Field
The invention relates to a technology that an IP Multimedia Subsystem (IMS) access function of a called user is not supported by a visited place Network, in particular to a method and a system for accessing a terminal call through a visited place IMS access point.
Background
IMS is an IP-based network architecture proposed by the third Generation Partnership Project (3 GPP), which constructs an open and flexible service environment, supports multimedia applications, and can provide rich multimedia services to users.
In the IMS service system, the control layer and the service layer are separated, the control layer does not provide specific services, and only provides necessary functions of triggering, routing, charging and the like for the service layer.
The service triggering and Control functions in the Control layer are performed by a Call Session Control Function (CSCF). The call session control functions mainly include: three types of Proxy call session control function entities (P-CSCF), inquiry call session control function entities (I-CSCF), and Serving call session control function entities (S-CSCF), wherein S-CSCF functions are necessary and I-CSCF is optional.
The service layer is composed of a series of Application Servers (AS), which can provide specific service services, and the AS may be an independent entity or may exist in the S-CSCF.
And the control layer (S-CSCF) controls service triggering according to the subscription information of the user, calls the service on the AS and realizes the service function.
The end-to-end Equipment in the session is called User Equipment (UE) and is responsible for interaction with the UE User. The UE has multiple ways to access the network, including accessing the network through a Packet Switched (PS) domain of 3GPP, or accessing the network through a PS domain of other non-3 GPP, or even accessing the network through a Circuit Switched (CS) domain, and so on. When an IMS subscriber accesses and originates a call in the CS domain, its call signaling needs to be routed to the IMS domain to which the subscriber belongs, thereby providing services to the subscriber.
Step 101, UE-2 calls UE-1, such as sending INVITE message with the ID of UE-1 as target;
step 102, the call message is routed to the home IMS network of UE-1, and is routed to a home service Continuity and convergence Application Server (SCC AS) by CSCF of the home IMS network of UE-1, the home SCC AS judges that UE-1 is accessed in the CS domain, and then decides to call UE-1 through the CS domain, and the home SCC AS acquires number information A of UE-1;
step 103, the home SCC AS sends a call message with the number information a AS a target, for example, an INVITE message with the number information a AS a target (destination address) to send an IMS signaling;
step 104, the call Message is routed to a Media Gateway Control Function (MGCF) of the home IMS network of the UE-1 by the home CSCF, the home MGCF translates the IMS signaling into a CS signaling, and routes the call Message to an MSC of the visited place of the UE-1 through the CS network, such as an Initial Address Message (IAM) or an INVITE Message for sending the CS signaling;
step 105, after receiving the message of the calling number a, the visited MSC calls the UE-1, for example, sends a SETUP (SETUP) message of the CS signaling;
step 106, UE-1 answers the call;
step 107, the visited MSC forwards the response message, and the response message is sent to the MGCF of the home IMS network of the UE-1 through the CS network, for example, sending a response message (ANM, AnswerMessage) or "200 OK";
step 108, home MGCF translates the response message of CS signaling into a response message of IMS signaling, such as "200 OK" message, and then forwards the response message, which reaches home SCCAS through home CSCF;
in step 109, the home SCC AS forwards the response message to UE-2.
In this regard, a call is established between UE-1 and UE-2, wherein the CS media path is connected from the visited network of UE-1 to the home network of UE-1.
The prior art has the defects that even if the visited network of the UE-1 has the IMS network access capability, the UE-1 does not use the IMS network access capability of the visited network of the UE-1 when the UE-1 is in the CS domain as a called call, thereby occupying the long-distance link resources of the CS.
Disclosure of Invention
In view of this, the main objective of the present invention is to provide a method and a system for accessing a terminating call through a visited IMS access point, which can access a terminating call initiated by a called user in a CS domain through the visited IMS access point.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method of terminating access through a visited IMS access point, comprising:
after receiving a first call request for a called user, an SCC AS determines that the called user is accessed in a CS domain, acquires CS domain information of the called user, and sends a second call request to the called user through a PS domain, wherein the second call request carries the CS domain information of the called user;
and the VICP receives the second call request, and sends a third call request to the called user through the CS domain according to the CS domain information of the called user carried in the second call request.
Preferably, the CS domain information is at least one of the following information: number information, identification information, CS domain indication and MSC information;
the sending, by the SCC AS, the second call request to the called user through the PS domain specifically includes: and the SCC AS sends the second call request by taking the identification information used when the called user performs IMS registration AS a target.
Preferably, the sending, by the VICP, the third call request to the called subscriber through the CS domain according to the CS domain information of the called subscriber carried in the second call request specifically includes:
and the VICP determines MSC information according to the CS domain information of the called user and sends the third call request to the MSC, wherein the target of the third call request is number information or identification information in the CS domain information.
Preferably, the sending, by the VICP, the third call request to the called subscriber through the CS domain according to the CS domain information of the called subscriber carried in the second call request specifically includes:
and the VICP sends the third call request by taking the number information in the CS domain information of the called user as a target.
Preferably, the first call request, the second call request and the third call request belong to call requests of the same session.
Preferably, the VICP is an Access Transfer Control Function (ATCF), a P-CSCF, an Interworking Border Control Function (IBCF), or an MSC having an IMS Access Function.
A system for accessing terminal call through visited IMS access point includes SCC AS and VICP; wherein,
the SCC AS is used for determining the access of a called user in a CS domain after receiving a first call request to the called user; the CS domain information of the called user is obtained, and a second call request is sent to the called user through a PS domain, wherein the second call request carries the CS domain information of the called user;
and the VICP is used for sending a third call request to the called user through the CS domain according to the CS domain information of the called user carried in the second call request after receiving the second call request.
Preferably, the CS domain information is at least one of the following information: number information, identification information, CS domain indication and MSC information;
preferably, the VICP further determines MSC information according to the CS domain information of the called subscriber, and sends the third call request to the MSC, where a target of the third call request is number information or identification information in the CS domain information.
Preferably, the VICP further sends the third call request with number information in the CS domain information of the called subscriber as a target.
Preferably, the first call request, the second call request and the third call request belong to call requests of the same session.
Preferably, the VICP is an ATCF, or a P-CSCF, or an IBCF, or an MSC with IMS access function.
In the invention, after receiving a call request to a called user, an SCC AS acquires CS domain information of the called user and calls the called user through a PS domain, wherein the call message carries the CS domain information of the called user; the calling message is routed to the VICP, and the VICP sends the calling request to the called user through the CS domain according to the CS domain information of the called user. The invention can make IMS called user use the IMS access ability of the visited place when the CS domain access generates the terminal call, and reduce the occupation of CS long-distance link resources to a certain extent.
Drawings
Fig. 1 is a flow chart of an existing IMS subscriber at CS termination;
fig. 2 is a flowchart of a first embodiment of a method for accessing a terminating call through a visited IMS access point according to the present invention;
fig. 3 is a flowchart of a second method for accessing a terminating call through a visited IMS access point according to the present invention.
Detailed Description
The invention has the basic idea that after receiving a call request to a called user, the SCC AS acquires the CS domain information of the called user and calls the called user through the PS domain, wherein the call message carries the CS domain information of the called user; the calling message is routed to the VICP, and the VICP sends the calling request to the called user through the CS domain according to the CS domain information of the called user.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings by way of examples.
Example one
Fig. 2 is a flowchart of a first embodiment of a method for accessing a terminal call through a visited IMS access point, where as shown in fig. 2, an application scenario of this example is that an IMS user terminal UE-1 registers to an IMS domain through a VICP, but an MSC does not provide an IMS access function, so that a visited network PS domain does not provide a voice access capability, and can only receive a voice call of UE-2 in a CS domain, and a method for accessing a terminal call through a visited IMS access point specifically includes the following steps:
step 201, UE-1 uses mark A to execute IMS registration through PS domain of visiting network, the registration process passes through VICP;
step 202, UE-2 calls UE-1, for example, sends a call message such as INVITE message targeting identity a of UE-1;
step 203, a call message (such AS an INVITE message) is routed to a home IMS network of the UE-1, and routed to an SCC AS by a CSCF of the home IMS network of the UE-1, and the SCC AS determines that the UE-1 accesses in a CS domain, and then decides to call the UE-1 through the CS domain, and the SCC AS obtains number information B (which may be a number of the UE-1, and may also be a CS domain routing number of the UE-1 in a visited network) of the UE-1 and/or CS domain access point information, that is, information of an MSC;
step 204, SCC AS calls UE-1 through PS domain, for example, using identifier a to send a call message, where the call message carries CS domain information, and the CS domain information includes number information B, and may also include CS domain indication to show that the VICP calls UE-1 through CS domain, and may also include MSC information to indicate that the VICP directly sends the call to the MSC without intermediate routing, because UE-1 is called through PS domain, the call message may be routed to the VICP;
step 205, the VICP determines that the call message also carries CS domain information, so that UE-1 is called through the CS domain, for example, the target of the call message is changed to number B and then sent, an INVITE message of IMS signaling may be sent to MGCF of the visited network, or the call message may be directly sent to MSC according to MSC information, and the call message may finally reach MSC in CS signaling;
step 206, receiving the call message, the MSC calls UE-1, for example, the SETUP message of sending CS signaling;
step 207, UE-1 answers the call;
step 208, MSC forwards the response message, such as the response message sending CS signaling, e.g. ANM message or "200 OK" message, the response message may be translated into IMS signaling, e.g. "200 OK" message, by MGCF of visited place, and the response message reaches VICP;
step 209, the VICP forwards the response message, and the message reaches the SCC AS through the CSCF;
in step 210, the SCC AS forwards the response message to the UE-2.
Therefore, a conversation is established between the UE-1 and the UE-2, wherein the CS media path is only in the visiting network of the UE-1, and CS long-distance link resources are not occupied.
In the invention, the VICP is an Access Transfer Control Function (ATCF), or a proxy call session control function (P-CSCF), or an Interactive Border Control Function (IBCF), or an MSC with an IMS access function.
Example two
Fig. 3 is a flowchart of a second embodiment of the method for accessing a terminating call through a visited IMS access point, where as shown in fig. 3, an application scenario of this example is that an IMS user terminal UE-1 registers to an IMS domain through a VICP, an MSC provides an IMS access function, the MSC may replace the UE-1 to perform IMS registration (i.e., the UE-1 has two IMS registrations), and a registration process of the MSC may pass through the VICP (whether the implementation of the technical solution of the present invention is not affected), and since a visited network PS domain does not provide a voice capability, a voice call of the UE-2 can only be received in a CS domain, including the following steps:
step 301, UE-1 uses identification A to execute IMS registration through PS domain of visited place, and registration process passes through VICP;
step 302, the MSC uses the identifier B to replace the UE-1 to perform IMS registration, the registration process may pass (may not pass) the VICP, the identifier B and the identifier a may be the same, and the registration process also carries the identifier information of the MSC, for example, in a Contact header field;
step 303, UE-2 calls UE-1, for example, sends a call message such as INVITE message with the identifier of UE-1 as the target;
step 304, the call message (such AS INVITE message) is routed to the home IMS network of UE-1, and is routed to the SCC AS by the CSCF of the home IMS network of UE-1, and the SCC AS determines that UE-1 accesses in the CS domain, and then decides to call UE-1 through the CS domain, and the SCC AS obtains the number information D of UE-1 and/or the identifier B and/or the CS domain access point information, i.e. the information of MSC.
Step 305, SCC AS calls UE-1 through PS domain, for example, using identifier a to send a call message, where the call message carries CS domain information, and includes number information D and/or identifier B, and may also include CS domain indication to show that the VICP calls UE-1 through CS domain, and may also include MSC information to indicate that the VICP directly sends the call to the MSC without intermediate routing, and since UE-1 is called through PS domain, the call message may be routed to the VICP;
step 306, the VICP judges that the call message also carries CS domain information, so that UE-1 is called through the CS domain, for example, the destination of the call message is changed to be sent by number D or identifier B, an INVITE message of IMS signaling can be sent to MGCF of the visited network, or the call message can be directly sent to MSC according to MSC information;
step 307, receiving the call message, the MSC calls UE-1, for example, the SETUP message of sending CS signaling;
step 308, UE-1 answers the call;
step 309, the MSC forwards the response message, for example, the response message sending CS signaling such as ANM message or "200 OK" message of IMS signaling, the response message may be translated into IMS signaling such as "200 OK" message by MGCF of the visited place, and the response message reaches the VICP;
step 310, the VICP forwards the response message, and the message reaches the SCC AS through the CSCF;
in step 311, the SCC AS forwards the response message to the UE-2.
Therefore, a conversation is established between the UE-1 and the UE-2, wherein the CS media path is only in the visiting network of the UE-1, and CS long-distance link resources are not occupied.
In the invention, the VICP is ATCF, P-CSCF, IBCF or MSC with IMS access function.
The invention also discloses a system for accessing the terminal call through the visited IMS access point, wherein the system comprises an SCC AS and a VICP; the following corresponding application functions are provided:
the SCC AS is used for determining the access of a called user in a CS domain after receiving a first call request to the called user; the CS domain information of the called user is obtained, and a second call request is sent to the called user through a PS domain, wherein the second call request carries the CS domain information of the called user;
and the VICP is used for sending a third call request to the called user through the CS domain according to the CS domain information of the called user carried in the second call request after receiving the second call request.
The CS domain information is at least one of the following information: number information, identification information, CS domain indication and MSC information;
the SCC AS further sends the second call request with the identification information used when the called user performs IMS registration AS a target.
The VICP further determines MSC information according to the CS domain information of the called subscriber, and sends the third call request to the MSC, where the third call request is targeted to number information or identification information in the CS domain information.
The above-mentioned VICP further sends the third call request with the number information in the CS domain information of the called subscriber as a target.
The first call request, the second call request and the third call request belong to a call request of the same session.
The VICP is ATCF, P-CSCF, IBCF or MSC with IMS access function.
It should be understood by those skilled in the art that the system for accessing an end call through a visited IMS access point of the present invention is designed to implement the aforementioned method for accessing an end call through a visited IMS access point, and the implementation functions of the aforementioned processing units can be understood by referring to the related description of the aforementioned method. The functions of the processing units in the figures may be implemented by a program running on a processor, or may be implemented by specific logic circuits.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (13)
1. A method for terminating access through a visited IMS access point, the method comprising:
after receiving a first call request to a called user, a service continuity and centralization application server (SCC AS) determines that the called user is accessed in a Circuit Switching (CS) domain, wherein the SCC AS acquires CS domain information of the called user and sends a second call request to the called user through a Packet Switching (PS) domain, and the second call request carries the CS domain information of the called user;
and the Visited IMS Control Point (VICP) receives the second call request, and sends a third call request to the called user through the CS domain according to the CS domain information of the called user carried in the second call request.
2. The method of claim 1, wherein the sending, by the SCC AS, the second call request to the called user through the PS domain specifically comprises:
and the SCC AS sends the second call request by taking the identification information used when the called user performs IMS registration AS a target.
3. The method of claim 1, wherein the CS domain information is at least one of the following: number information, identification information, CS domain indication and MSC information.
4. The method according to claim 3, wherein the sending, by the VICP, the third call request to the called subscriber through the CS domain according to the CS domain information of the called subscriber carried in the second call request specifically comprises:
and the VICP determines MSC information according to the CS domain information of the called user and sends the third call request to the MSC, wherein the target of the third call request is number information or identification information in the CS domain information.
5. The method according to claim 3, wherein the sending, by the VICP, the third call request to the called subscriber through the CS domain according to the CS domain information of the called subscriber carried in the second call request specifically comprises:
and the VICP sends the third call request by taking the number information in the CS domain information of the called user as a target.
6. The method according to any of claims 1 to 5, wherein the first call request, the second call request and the third call request belong to call requests of the same session.
7. The method of claim 1, wherein the VICP is an Access Transfer Control Function (ATCF), or a proxy call session control function (P-CSCF), or an Interworking Border Control Function (IBCF), or an MSC with IMS access functionality.
8. A system for accessing a terminating call through a visited IMS access point, the system comprising a SCC AS and a VICP; wherein,
the SCC AS is used for determining that a called user is accessed in a Circuit Switching (CS) domain after receiving a first call request to the called user; the CS domain information of the called user is obtained, and a second call request is sent to the called user through a PS domain, wherein the second call request carries the CS domain information of the called user;
and the VICP is used for sending a third call request to the called user through the CS domain according to the CS domain information of the called user carried in the second call request after receiving the second call request.
9. The system of claim 8, wherein the CS domain information is at least one of: number information, identification information, CS domain indication and MSC information.
10. The system according to claim 9, wherein said VICP further determines MSC information according to CS domain information of said called subscriber, and sends said third call request to said MSC, and a target of said third call request is number information or identification information in said CS domain information.
11. The system of claim 9, wherein the VICP further sends the third call request targeting number information in CS domain information of the called subscriber.
12. The system according to any of claims 8 to 11, wherein the first call request, the second call request and the third call request belong to call requests of the same session.
13. The system of claim 12, wherein the VICP is an ATCF, or a P-CSCF, or an IBCF, or an MSC with IMS access functionality.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010295647.3A CN102420803B (en) | 2010-09-27 | 2010-09-27 | Called through the method and system of visited place IMS access point access eventually |
| PCT/CN2011/078856 WO2012041138A1 (en) | 2010-09-27 | 2011-08-24 | Method and system for final call accessing via visited ims access point |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010295647.3A CN102420803B (en) | 2010-09-27 | 2010-09-27 | Called through the method and system of visited place IMS access point access eventually |
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| CN102420803A true CN102420803A (en) | 2012-04-18 |
| CN102420803B CN102420803B (en) | 2016-03-30 |
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| CN201010295647.3A Expired - Fee Related CN102420803B (en) | 2010-09-27 | 2010-09-27 | Called through the method and system of visited place IMS access point access eventually |
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| CN (1) | CN102420803B (en) |
| WO (1) | WO2012041138A1 (en) |
Cited By (1)
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|---|---|---|---|---|
| WO2015101205A1 (en) * | 2013-12-31 | 2015-07-09 | 华为技术有限公司 | Call control device and method for processing user services |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105025454B (en) * | 2014-04-30 | 2019-06-25 | 中国移动通信集团公司 | A kind of charging method, system and network side equipment |
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| CN101114976A (en) * | 2006-07-28 | 2008-01-30 | 摩托罗拉公司 | Method for establishing circuit switching call on dual-module access terminal |
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| CN101102614B (en) * | 2007-08-03 | 2011-06-22 | 中兴通讯股份有限公司 | Method for implementing call forwarding on busy in IMS centrally controlled service |
| KR20090016363A (en) * | 2007-08-10 | 2009-02-13 | 삼성전자주식회사 | Apparatus and method for domain transfer of user equip in internet protocol multimedia subsystem |
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- 2010-09-27 CN CN201010295647.3A patent/CN102420803B/en not_active Expired - Fee Related
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- 2011-08-24 WO PCT/CN2011/078856 patent/WO2012041138A1/en active Application Filing
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| WO2015101205A1 (en) * | 2013-12-31 | 2015-07-09 | 华为技术有限公司 | Call control device and method for processing user services |
| US9918216B2 (en) | 2013-12-31 | 2018-03-13 | Huawei Technologies Co., Ltd | Home network domain selection for routing call to a visited network |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012041138A1 (en) | 2012-04-05 |
| CN102420803B (en) | 2016-03-30 |
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