WO2012041138A1 - Procédé et système pour l'accès à un appel final par le biais d'un point d'accès ims de déplacement - Google Patents

Procédé et système pour l'accès à un appel final par le biais d'un point d'accès ims de déplacement Download PDF

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Publication number
WO2012041138A1
WO2012041138A1 PCT/CN2011/078856 CN2011078856W WO2012041138A1 WO 2012041138 A1 WO2012041138 A1 WO 2012041138A1 CN 2011078856 W CN2011078856 W CN 2011078856W WO 2012041138 A1 WO2012041138 A1 WO 2012041138A1
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Prior art keywords
call request
domain
information
called user
vicp
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PCT/CN2011/078856
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English (en)
Chinese (zh)
Inventor
谢振华
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中兴通讯股份有限公司
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Publication of WO2012041138A1 publication Critical patent/WO2012041138A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H04W76/16—Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer

Definitions

  • the present invention relates to a technology in which an access network does not support an access point of an IP multimedia subsystem (IMS, IP Multimedia Core Network Subsystem) of a called user, and in particular, a method for accessing a IMS access point through a visited IMS access point And system.
  • IMS IP Multimedia Core Network Subsystem
  • IMS IP-based network architecture proposed by the 3rd Generation Partnership Project (3GPP). It builds an open and flexible business environment, supports multimedia applications, and provides users with rich multimedia services.
  • 3GPP 3rd Generation Partnership Project
  • control layer 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 the necessary triggering, routing, and accounting functions to the service layer.
  • the service triggering and control functions in the control layer are performed by the Call Session Control Function (CSCF, Call Session Control Function).
  • the call session control functions mainly include: a proxy call session control function entity (P-CSCF, Proxy-CSCF), an inquiry call session control function entity (I-CSCF, Interrogating-CSCF), and a service call session control function entity (S-CSCF, Serving-CSCF) three types, of which the S-CSCF function is required, and the I-CSCF is optional.
  • the service layer is composed of a series of application servers (AS, Application Server), which can provide specific service services.
  • AS application servers
  • the AS can be an independent entity or exist in the S-CSCF.
  • the control layer controls the service trigger according to the subscription information of the user, invokes the service on the AS, and implements the service function.
  • the end-to-end device in the session is called User Equipment (UE) and is responsible for interaction with the UE user.
  • the UE has multiple ways of accessing the network, including packets through 3GPP.
  • the switching (PS, Packet Switch) domain accesses the network, or accesses the network through other non-3GPP PS domains, and even accesses the network through a circuit switched (CS, Circuit Switch) domain.
  • PS Packet Switch
  • CS Circuit Switch
  • Step 101 UE-2 calls UE-1, for example, sending an invitation with the identifier of UE-1 as a target.
  • Step 102 The call message is routed to the home IMS network of the UE-1, and is routed by the CSCF of the home IMS network of the UE-1 to the Service Centralization and Continuity Application Server (SCC AS).
  • SCC AS determines that the UE-1 is in the CS domain, and then decides to call the UE-1 through the CS domain, and the home SCC AS acquires the number information A of the UE-1;
  • Step 103 The home SCC AS sends a call message with the number information A as a target, for example, sending an INVITE message of the IMS signaling with the number information A as the destination (destination address);
  • Step 104 The call message is routed by the home CSCF to the media gateway control function entity (MGCF, Media Gateway Control Function) of the home IMS network of the UE-1, and the home MGCF translates the IMS signaling into CS signaling, and the CS network will
  • the call message is routed to the MSC of the visited place of UE-1, for example, an initial address (IAM, Initial Address Message) message or an INVITE message for transmitting CS signaling;
  • IAM Initial Address Message
  • Step 105 After receiving the message of the calling number A, the visited MSC calls the UE-1, for example, sending a CS signaling establishment (SETUP) message;
  • SETUP CS signaling establishment
  • 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 an answer message (ANM, Answer Message) or "200 OK";
  • NAM Answer Message
  • Step 108 The home MGCF translates the CS signaling response message into the IMS signaling response.
  • a message such as a "200 OK" message, and then forwarded, the message arrives at the home SCC AS through the home CSCF;
  • Step 109 The home SCC AS forwards the response message to UE-2.
  • 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 shortcoming of the prior art is that even if the visited network of the UE-1 has the IMS network access capability, the UE-1 in the CS domain does not use the IMS of the visited network of the UE-1 as the called call.
  • the network access capability which occupies the long-distance link resources of the CS.
  • the main purpose of the present invention is to provide a method and system for accessing a IMS access point through a visited call, and can perform a call to a IMS access point that is called by a called user in the CS domain.
  • a method for terminating a call by visiting an IMS access point including:
  • the SCC AS After receiving the first call request to the called user, the SCC AS determines that the called user accesses in the CS domain, and the SCC AS acquires the CS domain information of the called user, and sends the CS domain information to the called domain through the PS domain. Calling the user to send a second call request, where the second call request carries the CS domain information of the called user;
  • 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.
  • the CS domain information is at least one of the following information: number information, identification information, CS domain indication, MSC information;
  • the SCC AS sends the second call request by using the PS domain, where the SCC AS sends the second call request by using the identifier information used by the called user to perform IMS registration.
  • the VICP sends the third call request to the called user by using the CS domain according to the CS domain information of the called user that is carried in the second call request, specifically:
  • the VICP determines the MSC information according to the CS domain information of the called user, and sends the third call request to the MSC, where the target of the third call request is the number information in the CS domain information or Identification information.
  • the VICP sends the 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, which is specifically:
  • the VICP sends the third call request with the number information in the CS domain information of the called user 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 an Access Transfer Control Function (ATCF), or a P-CSCF, or an Interconnection Border Control Function (IBCF), or an MSC with an IMS access function.
  • ATCF Access Transfer Control Function
  • IBCF Interconnection Border Control Function
  • a system for terminating access through a visited IMS access point including SCC AS and VICP;
  • the SCC AS is configured to: after receiving the first call request to the called user, determine that the called user accesses in the CS domain; and acquire CS domain information of the called user, and send the CS domain information to the The called user sends a second call request, where the second call request carries the CS domain information of the called user;
  • the VICP after receiving the second call request, 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.
  • the CS domain information is at least one of the following information: number information, identification information, CS domain indication, MSC information;
  • the VICP further determines the MSC information according to the CS domain information of the called user, and sends the third call request to the MSC, where the target of the third call request is in the CS domain information. Number information or identification information.
  • the VICP further sends the third call request with the number information in the CS domain information of the called user 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 an ATCF, or a P-CSCF, or an IBCF, or an MSC having an IMS access function.
  • the SCC AS After receiving the call request to the called user, the SCC AS acquires the CS domain information of the called user, and calls the called user through the PS domain, and the call message carries the CS domain information of the called user; The message is routed to the VICP.
  • the VICP will send the call request to the called user through the CS domain according to the CS domain information of the called user.
  • the invention enables the IMS called user to use the IMS access capability of the visited place when the CS domain access terminal call occurs, which reduces the occupation of the CS long-distance link resource to a certain extent.
  • 1 is a flow chart of an existing IMS user at the end of the CS call
  • Embodiment 2 is a flow chart of Embodiment 1 of a method for accessing a IMS access point through a visited IMS access point according to the present invention
  • FIG. 3 is a flowchart of Embodiment 2 of a method for accessing a IMS access point by a visited call according to the present invention.
  • the basic idea of the present invention is that after receiving the call request to the called user, the SCC AS acquires the CS domain information of the called user, and calls the called user through the PS domain, and the call message carries the called The CS domain information of the user is called; the call message is routed to the VICP, and the VICP sends the call request to the called user through the CS domain according to the CS domain information of the called user.
  • FIG. 2 is a flowchart of Embodiment 1 of a method for accessing a IMS access point by a visited call according to the present invention.
  • the application scenario of the present example is that the IMS user terminal UE-1 registers with the IMS domain through the VICP.
  • the MSC does not provide the IMS access function.
  • the voice call of the UE-2 can only be accepted in the CS domain.
  • the method specifically includes the following steps:
  • Step 201 UE-1 performs IMS registration by using the identifier A by visiting the PS domain of the network, and the registration process passes the VICP;
  • Step 202 UE-2 calls UE-1, for example, sending a call message such as an INVITE message with the identifier A of UE-1 as a target;
  • Step 203 A call message (such as an INVITE message) is routed to the home IMS network of the UE-1, and is routed to the SCC AS by the CSCF of the home IMS network of the UE-1, and the SCC AS determines that the UE-1 is connected in the CS domain, and then determines Calling UE-1 through the CS domain, the SCC AS obtains the number information B of the UE-1 (which may be the number of the UE-1, or the CS domain routing number of the UE-1 in the visited network) and/or the CS domain access point.
  • Information is the information of the MSC;
  • Step 204 The SCC AS calls the UE-1 through the PS domain, for example, using the identifier A to send a call message, where the call message carries the CS domain information, the CS domain information includes the number information B, and the CS domain indication may also be included to indicate that the VICP is to be passed.
  • the CS domain calls UE-1, and may also include MSC information to instruct the VICP to directly send the call to the MSC without intermediate routing.
  • Step 205 The VICP determines that the call message further carries the CS domain information, and then calls the UE-1 through the CS domain, for example, the destination of the call message is changed to the number B, and the INVITE message of the IMS signaling can be sent to the MGCF of the visited network.
  • the call message may also be directly sent to the MSC according to the MSC information, and the call message will eventually arrive at the MSC by means of CS signaling;
  • Step 206 Receive a call message, and the MSC calls UE-1, for example, sends a SETUP message of CS signaling to UE-1.
  • Step 207 UE-1 answers the call.
  • Step 208 The MSC forwards the response message, for example, sends a CS signaling response message, such as an ANM message or a "200 OK" message, and the response message may be translated into IMS signaling by the visited MGCF, such as a "200 OK" message, and the response The message arrives at VICP;
  • a CS signaling response message such as an ANM message or a "200 OK” message
  • the response message may be translated into IMS signaling by the visited MGCF, such as a "200 OK" message, and the response The message arrives at VICP;
  • Step 209 the VICP forwards the response message, and the message arrives at the SCC AS through the CSCF;
  • Step 210 The SCC AS forwards the response message to the UE-2.
  • a call is established between UE-1 and UE-2, wherein the CS media path is only in the visited network of UE-1, and does not occupy CS long-distance link resources.
  • 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 having an IMS access function.
  • ATCF access transfer control function
  • P-CSCF proxy call session control function
  • IBCF interactive border control function
  • FIG. 3 is a flowchart of Embodiment 2 of a method for accessing a IMS access point by a visited terminal according to the present invention.
  • the application scenario of the present example is that the IMS user terminal UE-1 registers with the IMS domain through the VICP.
  • the MSC provides the IMS access function, and the MSC may perform the IMS registration instead of the UE-1 (that is, the UE-1 has two IMS registrations), and the registration process of the MSC may pass the VICP (whether or not the implementation of the technical solution of the present invention is not affected).
  • Step 301 UE-1 performs IMS registration by using the identifier A in the PS domain of the visited place, and the registration process passes the VICP;
  • Step 302 The MSC performs the IMS registration by using the identifier B instead of the UE-1.
  • the registration process may pass (may not pass) the VICP, and the identifier B and the identifier A may be the same.
  • the registration process also carries the identification information of the MSC, for example, in Contact. ) the header field carries;
  • Step 303 UE-2 calls UE-1, for example, sending a call message, such as an INVITE message, with the identifier of UE-1 as a target;
  • a call message such as an INVITE message
  • Step 304 A call message (such as an INVITE message) is routed to the home IMS network of the UE-1, and is routed to the SCC AS by the CSCF of the home IMS network of the UE-1, and the SCC AS determines that the UE-1 is connected in the CS domain, and then determines The UE is called by the CS domain, and the SCC AS acquires the number information D of the UE-1 and/or the information of the B and/or CS domain access point information, that is, the MSC.
  • a call message (such as an INVITE message) is routed to the home IMS network of the UE-1, and is routed to the SCC AS by the CSCF of the home IMS network of the UE-1, and the SCC AS determines that the UE-1 is connected in the CS domain, and then determines The UE is called by the CS domain, and the SCC AS acquires the number information D of the UE-1 and/or the information of the B and/or CS domain access point
  • Step 305 The SCC AS calls the UE-1 through the PS domain, for example, using the identifier A to send a call message, where the call message carries the CS domain information, including the number information D and/or the identifier B, and may further include a CS domain indication to indicate that the VICP is to be passed.
  • the CS domain calls UE-1, and may also include MSC information to instruct the VICP to directly send the call to the MSC without intermediate routing. Since the UE is called through the PS domain, the call message is routed to the VICP;
  • Step 306 the VICP determines that the call message also carries the CS domain information, and then calls the UE-1 through the CS domain, for example, the target of the call message is changed to the number D or the identifier B, and the INVITE of the IMS signaling can be sent to the MGCF of the visited network.
  • the message may also be sent directly to the MSC according to the MSC information;
  • Step 307 Receive a call message, and the MSC calls UE-1, for example, a SETUP message that sends CS signaling.
  • Step 309 the MSC forwards the response message, for example, sends a response message of the CS signaling, such as ANM message or "200 OK" message or "200 OK” message of IMS signaling, the response message may be translated into IMS signaling by the MGCF of the visited place, such as "200 OK" message, and the response message arrives at VICP;
  • a response message of the CS signaling such as ANM message or "200 OK” message or "200 OK” message of IMS signaling
  • the response message may be translated into IMS signaling by the MGCF of the visited place, such as "200 OK" message, and the response message arrives at VICP;
  • Step 310 the VICP forwards the response message, and the message arrives at the SCC AS through the CSCF;
  • Step 311 The SCC AS forwards the response message to the UE-2.
  • a call is established between UE-1 and UE-2, where the CS media path is only in the visited network of UE-1, and does not occupy CS long-distance link resources.
  • the VICP is ATCF, or P-CSCF, or IBCF, or an MSC having an IMS access function.
  • the invention also describes a system for terminating access through an visited IMS access point, the system comprising SCC AS and VICP; having the following corresponding application functions:
  • the SCC AS is configured to: after receiving the first call request to the called user, determine that the called user accesses in the CS domain; and acquire CS domain information of the called user, and send the CS domain information to the The called user sends a second call request, where the second call request carries the CS domain information of the called user;
  • the VICP after receiving the second call request, 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.
  • the CS domain information is at least one of the following information: number information, identification information, CS domain indication, MSC information;
  • the SCC AS further sends the second call request with the identifier information used by the called user for IMS registration.
  • the VICP further determines the MSC information according to the CS domain information of the called user, and sends the third call request to the MSC, where the target of the third call request is the number information in the CS domain information or Identification information.
  • the VICP further transmits the third call request with the number information in the CS domain information of the called user 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 above VICP is ATCF, or P-CSCF, or IBCF, or has IMS access function.
  • the system for accessing the IMS access point through the visited IMS access point is designed to implement the foregoing method for accessing the IMS access point by the visited IMS, and the implementation of each processing unit is implemented.
  • the function can be understood by referring to the relevant description of the aforementioned method.
  • the functions of the various units in the figure can be implemented by a program running on a processor, or by a specific logic circuit.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention a trait à un procédé pour l'accès à un appel final par le biais d'un point d'accès IMS de déplacement, qui se déroule de la manière suivante : après la réception d'une demande d'appel à un abonné appelé, un SCC AS détermine que ledit abonné appelé utilise un domaine CS pour l'accès, il obtient des informations d'identification du domaine CS de l'abonné appelé, et il appelle l'abonné appelé par le biais d'un domaine PS, le message d'appel contenant les informations d'identification du domaine CS de l'abonné appelé ; et le VICP appelle l'abonné appelé par le biais du domaine CS conformément à l'identification du domaine CS de l'abonné appelé contenu dans le message d'appel. L'invention se rapporte également à un système qui permet l'accès à un appel final par le biais d'un point d'accès IMS de déplacement, ainsi qu'à la mise en œuvre du procédé précité. La présente invention limite dans une certaine mesure l'occupation des ressources de liaison CS longue distance.
PCT/CN2011/078856 2010-09-27 2011-08-24 Procédé et système pour l'accès à un appel final par le biais d'un point d'accès ims de déplacement WO2012041138A1 (fr)

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CN201010295647.3A CN102420803B (zh) 2010-09-27 2010-09-27 终呼通过拜访地ims接入点接入的方法及系统
CN201010295647.3 2010-09-27

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