WO2010054536A1 - 支持异域终端选网的核心网系统、装置及呼叫方法 - Google Patents

支持异域终端选网的核心网系统、装置及呼叫方法 Download PDF

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Publication number
WO2010054536A1
WO2010054536A1 PCT/CN2009/001261 CN2009001261W WO2010054536A1 WO 2010054536 A1 WO2010054536 A1 WO 2010054536A1 CN 2009001261 W CN2009001261 W CN 2009001261W WO 2010054536 A1 WO2010054536 A1 WO 2010054536A1
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Prior art keywords
domain
terminal
status information
registration status
core network
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PCT/CN2009/001261
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English (en)
French (fr)
Inventor
魏强
于青
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China Mobile Communications Group Co Ltd
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China Mobile Communications Corp
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Priority claimed from CN2008102264988A external-priority patent/CN101742693B/zh
Priority claimed from CN200810226499A external-priority patent/CN101742447A/zh
Application filed by China Mobile Communications Corp filed Critical China Mobile Communications Corp
Publication of WO2010054536A1 publication Critical patent/WO2010054536A1/zh
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
    • H04W36/00226—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB] wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]
    • 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 the field of mobile communication technologies, and in particular, to a core network system, device, and calling method for supporting an alien terminal selection network.
  • the traditional core network system is a Circuit Switch (CS) domain.
  • the CS domain mainly provides basic services such as end-to-end voice, video telephony, and short message. With the intensification of competition in the field of mobile communications, operators need to attract users through new differentiated services. For this reason, a packet switching (PS, Packet Switch) domain is introduced in the traditional core network system, and IP transmission is performed in the PS domain.
  • PS Packet Switch
  • MMS Multimedia Messaging Service
  • content browsing etc.
  • IMS IP Multimedia Subsystem
  • IMS also provides operators with: Non-real-time End-to-end services, such as Chat, Instant Messaging (IM) services; Multi-party services, such as Multimedia Conferencing, Chat Rooms, and Push to Push Talk over Cellular ); and some server-to-user services, such as Dynamic Push Services > Click to Dial. It can be said that IMS is a core network technology that can enhance the user experience and improve the revenue of operators.
  • Non-real-time End-to-end services such as Chat, Instant Messaging (IM) services
  • Multi-party services such as Multimedia Conferencing, Chat Rooms, and Push to Push Talk over Cellular
  • Dynamic Push Services > Click to Dial Some server-to-user services, such as Dynamic Push Services > Click to Dial. It can be said that IMS is a core network technology that can enhance the user experience and improve the revenue of operators.
  • a network between a CS domain (especially an intelligent network) of a core network system and an IMS domain The network architecture is shown in Figure 1, where the Service Control Point (SCP) functions only in the intelligent network service.
  • SCP Service Control Point
  • the HLR recognizes and instructs the Mobile Switching Centre (MSC) to transfer the call to the Media Gateway Control Function (MGCF, Media Gateway Control Function) / Media Gateway.
  • MSC Mobile Switching Centre
  • MGW Media Gateway
  • S-CSCF Service-Call Session Control Function
  • URL universal positioning connection
  • HSS Home Subscriber Server
  • terminals that are compatible with the 2nd generation CS, GPRS, and IMS domain services and terminals compatible with the 3rd generation CS, GPRS, and IMS domain services have emerged. These terminals can support the CS domain, the PS domain, and the IMS. Different services in the domain adopt a unified E.164 number, which is called an alien universal terminal (referred to as a dual domain terminal).
  • the remote domain can independently select the core domain when the service is initiated, when the foreign terminal is used as the receiving terminal, the existing core network system architecture cannot determine which core domain to provide support for the service.
  • a simple technical solution is to which the calling terminal initiates a call in the core domain, and provides service support through the core domain;
  • the technical solution is that the system randomly selects the core domain to provide support for the service.
  • the above two methods may cause the selected core domain to fail to find the called foreign terminal, thereby causing the call service to fail or delay;
  • the selected core domain can find the called foreign terminal.
  • the above two methods may also enable the voice service with better shield in the CS domain to finally establish a connection through the IMS domain, or make the multimedia service with more comprehensive IMS function finally pass the CS.
  • the domain is sent, etc., resulting in poor user experience.
  • Another technical solution for selecting a core network domain is as follows: The foreign terminal terminal performs registration switching in various core network domains to ensure that the state network is valid only in one core network domain at a certain time to achieve accurate and immediate selection of the core network. area.
  • this technical solution requires the core network system to continuously switch the state of the user and repeatedly configure the state information, resulting in an increase in efficiency and an increase in system performance requirements. Meanwhile, it is also impossible to simultaneously support the external universal terminal. The advantages of exotic business. Summary of the invention
  • the embodiments of the present invention provide a core network system, a device, and a calling method for supporting an alien terminal to select a network, so as to accurately and instantaneously select a core network domain for the called foreign terminal, and at the same time, improve system performance requirements.
  • the embodiment of the invention provides a calling method for supporting a heterogeneous terminal to select a network, including:
  • An embodiment of the present invention provides an apparatus for supporting a network selection of a foreign terminal, including:
  • An obtaining unit configured to acquire CS domain terminal registration status information, IMS domain terminal registration status information, and network selection policy information in the core network system;
  • a determining unit configured to determine, according to the acquired CS domain terminal registration status information and the IMS domain terminal registration status information, the registration status information of the called foreign terminal;
  • a selecting unit configured to select, according to the obtained network selection policy information and the determined registration status information, a core network domain from the core network system to provide the call service.
  • a core network system which includes a CS domain core network, an IMS domain core network, and an alien terminal, and
  • the HLR in the CS domain core network is used to save the CS domain terminal registration status information;
  • the HSS in the IMS domain core network is used to save the network selection policy information and the IMS domain terminal registration status information;
  • the selected network application server configured in the IMS domain core network interacts with the HSS and the HLR, respectively, for acquiring the CS domain terminal registration status information, the IMS domain terminal registration status information, and the network selection policy information in the core network system; Acquiring CS domain terminal registration status information and IMS domain terminal registration status information, determining registration state information of the called foreign terminal; and based on the obtained network selection policy information and the determined registration status information, from the core network system Selecting a core domain for the foreign terminal to provide the call service.
  • the embodiment of the present invention further provides a core network system, including a CS domain core network, an IMS domain core network, and an alien terminal, and
  • the HLR in the CS domain core network is used to store the CS domain terminal registration status information;
  • the HSS in the IMS domain core network is used to save the network selection policy information and the IMS domain terminal registration status information;
  • the SCP in the core network of the CS domain interacts with the HSS and the HLR to obtain the CS domain terminal registration status information, the IMS domain terminal registration status information, and the network selection policy information in the core network system.
  • the domain terminal registration status information and the IMS domain terminal registration status information determining the registration status information of the called foreign terminal; and based on the obtained network selection policy information and the determined registration status information, from the core network system
  • the foreign terminal selects a core domain to provide the call service.
  • the solution for supporting the heterogeneous terminal selection network obtains the registration status information of the called foreign terminal and the network selection policy information, and selects the called heterogeneous terminal from the core network system based on the acquired information.
  • a core domain provides the call service to accurately and instantly select a core domain for the called foreign terminal, thereby improving the user experience; and avoiding repeated state transitions of the foreign terminal, thereby reducing system performance requirements. . DRAWINGS
  • FIG. 1 is a system block diagram of a communication between a CS domain and an IMS domain in the prior art; 2 is a block diagram of a core network system according to Embodiment 1 of the present invention;
  • FIG. 3 is a block diagram of a core network system according to Embodiment 2 of the present invention.
  • FIG. 4 is a block diagram of a core network system according to Embodiment 3 of the present invention.
  • FIG. 5 is a flowchart of a method for supporting a heterogeneous terminal selection network according to Embodiment 4 of the present invention
  • FIG. 6 is a flowchart of a method for supporting a heterogeneous terminal selection network according to Embodiment 5 of the present invention
  • FIG. 8 is a block diagram of a core network system according to Embodiment 7 of the present invention.
  • FIG. 9 is a block diagram of a core network system according to Embodiment 8 of the present invention.
  • FIG. 10 is a flowchart of a method for supporting a heterogeneous terminal selection network according to Embodiment 9 of the present invention
  • FIG. 11 is a flowchart of a method for supporting a remote terminal selection network according to Embodiment 10 of the present invention. detailed description
  • the present invention provides a solution for supporting a heterogeneous terminal to select a network, in order to effectively utilize the advantages of the heterogeneous terminal compatible with the CS domain and the IMS domain service, and avoid the inability to accurately select the network or repeatedly register the logout defect, and improve the network selection hit rate.
  • the solution obtains the registration status information and the network selection policy information of the called foreign terminal, and selects a core network for the called foreign terminal to provide the call service from the core network system based on the obtained information, so as to be accurate, The core domain is selected for the called foreign terminal in real time without increasing the system performance requirements.
  • the calling method for supporting the remote terminal selection network includes: acquiring the CS domain terminal registration status information, the IMS domain terminal registration status information, and the network selection policy information in the core network system; State information and IMS domain terminal registration status information, determining registration state information of the called foreign terminal; selecting one of the core network systems for the foreign terminal based on the obtained network selection policy information and the determined registration status information
  • the core domain provides the call service.
  • selecting a core domain to provide a call service for the remote terminal based on the obtained network selection policy information and the determined registration status information includes: when the determined registration status information is that the called foreign terminal is only registered in the IMS domain. And selecting the IMS domain to provide a call service for the foreign terminal; When the determined registration status information is that the called foreign terminal is only registered in the CS domain, the CS domain is selected to provide the call service for the foreign terminal; the determined registration status information is the called foreign terminal in the IMS domain and the CS. When the domain is registered, the core network is selected to provide a call service for the foreign terminal based on the network selection policy information.
  • the method further includes: determining whether the call service is a real-time service; and when the determination result is yes, connecting the call service to the MSC in the CS domain to And the non-domain terminal; when the judgment result is no, the call service is connected to the foreign terminal by using the SMS/MMS of the CS domain.
  • the method further includes: determining whether the call service is a real-time service; and when the determination result is yes, passing the call service through the MGCF/MGW of the IMS domain. And connecting to the foreign terminal; when the determination result is no, the call service is connected to the foreign terminal through an IM/POC server of the IMS domain.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • FIG. 2 is a block diagram of a core network system according to the embodiment, including a CS domain core network A, an IMS domain core network B, and an alien terminal C.
  • the CS domain core network A and the IMS domain core network B are connected through the MGCF/MGW B4.
  • the so-called foreign terminal C refers to a terminal using a SIM+ISIM composite card of the second generation or a terminal using a USIM+ISIM composite card of the third generation.
  • the foreign terminal C can access the IMS domain to use the IMS service, and the CS domain to use the CS service, and possibly use the services of the two domains at the same time.
  • all 2 generation CS domain and PS domain services can be used to access the 2nd generation network, and the IMS domain can also be accessed through the 2nd generation GPRS to use the non-real time class.
  • IMS services such as instant messaging
  • real-time IMS services such as multimedia sessions
  • the external terminal C uses 3 generations of USIM + ISIM composite cards
  • access to the 3rd generation network can use all 3 generations of CS domain and PS domain
  • the service can also access the IMS domain through 3 generations of GPRS to use non-real-time IMS services (such as instant messaging) and real-time IMS services (such as multimedia sessions).
  • the IMS domain B includes the S-CSCF module B 1 and the HSS B2.
  • CS domain A includes MSC Al, HLR A2, and SMS (Short Message Service) / Multimedia Message Service (MMS) Center A3.
  • the S-CSCF module B1 obtains the affiliation mapping relationship between the E.164 number and the SIP URI number through the ENUM B3 by querying the home information in the HSS B2, so that the external terminal C in the IMS domain B can be directly implemented. Communication, or communication with the foreign terminal C in CS domain A through MGCF/MGW B4.
  • the HSS B2 of the IMS domain B is used to store the network selection policy information and the IMS domain terminal registration status information.
  • the network selection policy information is a network-wide policy information, that is, no The service is differentiated, and is simply set to be a CS domain A bearer or an IMS domain B bearer.
  • the ENUM module B3 of the IMS domain B interacts with the HSS B2 and the HLR A2 to obtain the registration status information and the network selection policy information of the remote terminal C, and determines whether the acquired registration status information and the network selection policy information are used. Returns the SIP URI number.
  • the analysis failure instruction is returned to the S-CSCF, then the S -CSCF automatically routes the call to MGCF/MGW.
  • the HSS B2 is used to store the network selection policy information and the IMS domain B terminal registration status information; the HLRA2 is used to save the CS domain A terminal registration status information; if an external terminal uses the IMS domain B service, The service of CS domain A is also used, and the state of the terminal C is registered at both HSS B2 and HLR A2.
  • the embodiment of the present invention only uses the HSS storage network selection policy information and the IMS domain terminal registration status information, and the HLR stores the CS domain terminal registration status information as an example for description.
  • the network selection policy information and the terminal registration status information are selected. It can also be stored in other entities.
  • the method for obtaining the registration status information of the terminal and the network selection policy, determining the registration status information of the called foreign terminal, and selecting the network service for the heterogeneous terminal to provide the call service by the core network are ENUM.
  • ENUM B3 interacts with HLR A2 and HSS B2, respectively, specifically ENUM B3 is communicatively coupled to HLR A2 and HSS B2, respectively.
  • the ENUM B3 of the IMS domain B is communicably connected to the HLR A2 through the MAP interface.
  • the MGCF/MGW B4 can perform certain functional improvements to distinguish between real-time services and non-real-time services, and send real-time services to the MSC to send non-real-time short message services to the SMS/MMS.
  • the problem of the MSC forwarding SMS/MMS can be avoided, and the efficiency is further improved.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the constituent modules are the same as those shown in FIG. 2, except that the HLR A2 is combined with the HSS B2 to form an integral device D; the ENUM B3 interacts with the HLR A2 and the HSS B2, respectively, specifically ENUM B3 and The overall device D communication connection is set.
  • the solution provided by this embodiment is more suitable for the fused mobile communication system.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • the constituent modules are the same as those shown in FIG. 2, except that the HLR A2 and the HSS B2 are connected in communication, and the HLR A2 updates the CS domain terminal registration status information to the HSS B2, and the ENUM B3 interacts with the HLR A2 and the HSS B2 respectively.
  • ENUM B3 communicates with HSS B2 to indirectly know the CS domain terminal registration status information provided by HLR A2.
  • the solution provided in this embodiment does not need to perform large-scale modification on the HLR and the HSS device, and also avoids the system complexity caused by multiple connections between the devices.
  • the HSS and the HLR can be realized only by setting the MAP interface in the HSS. connection.
  • the core network system of the prior art can continue to meet the requirements.
  • the core network system provided by the foregoing embodiment of the present invention needs to determine the return status returned by the ENUM B3 according to the registration status information of the remote terminal C and the preset network selection policy. The instructions, in turn, determine that the call is routed to one of IMS Domain B or 2/3 Generation CS Domain A for processing.
  • the core network system provided by the foregoing embodiment of the present invention can know the called foreign domain
  • the terminal is currently registered in different core domains, thereby improving the accuracy of the selection of the network.
  • the state transition of the remote terminal is avoided, and the system performance requirement is reduced.
  • the embodiment of the present invention further provides a calling method for supporting the network selection of the foreign terminal. Because the processing method of the foreign terminal as the calling party is the same as that of the ordinary IMS domain terminal or the CS domain terminal, it will not be described again. The following describes the processing method of the foreign terminal as the called party.
  • the service initiated by the CS domain caller is performed in the CS domain. If the called user is not registered in the CS domain, the HLR command is routed to the IMS domain for execution.
  • This embodiment mainly studies a processing method when an IMS domain terminal initiates a call service to an alien terminal.
  • the method includes:
  • Step 1 The S-CSCF of the IMS domain requests the ENUM to parse the called number.
  • Step 2 ENUM queries whether the called foreign terminal is registered in the IMS domain, if yes, step 3 is performed; otherwise, step 5 is performed;
  • Step 3 ENUM queries whether the called foreign terminal is registered in the CS domain, if yes, step 4 is performed; otherwise, step 7 is performed;
  • Step 4 ENUM queries the default network selection policy information in the HSS. If the CS domain is selected in the network mode (that is, the CS domain is selected), go to Step 5. Otherwise, go to Step 7.
  • Step 5 ENUM returns an analysis failure instruction to the S-CSCF.
  • Step 6 The S-CSCF connects the call service to the called alien terminal in the CS domain through the MGCF/MGW, and ends the call after completing the call;
  • Step 7 ENUM returns the parsed SIP URI number to the S-CSCF.
  • Step 8 The S-CSCF directly connects the call service to the called foreign terminal, and ends the call.
  • Step 101 The IMS city terminal M initiates a call to the S-CSCF, and the called party is an alien common number terminal. (external terminal) C's E.164 number;
  • Step 102 The S-CSCF requests the ENUM to parse the called E.164 number.
  • Step 103 ENUM queries whether the called foreign terminal C is registered in the IMS domain, if yes, step 104 is performed, otherwise step 106 is performed;
  • Step 104 ENUM query whether the called foreign terminal C is registered in the CS domain, if yes, go to step 105, otherwise go to step 112;
  • Step 105 ENUM queries the default network selection policy information in the HSS. If the network is in the CS domain selection mode, step 106 is performed, otherwise step 112 is performed;
  • Step 106 ENUM returns an analysis failure instruction to the S-CSCF.
  • Step 107 The S-CSCF connects the call service to the MGCF/MGW.
  • Step 108 The MGCF/MGW determines whether the call service is a real-time service, if yes, step 109 is performed, otherwise step 110 is performed;
  • Step 109 the MGCF/MGW connects the call service to the MSC, and performs step 111;
  • Step 110 The MGCF/MGW connects the call service to the SMS/MMS;
  • Step 111 The MSC or the SMS/MMS connects the call service to the called foreign terminal C, establishes a call channel of the terminal M and the terminal C, and ends after completing the call;
  • Step 112 ENUM returns the parsed SIP URI number to the S-CSCF.
  • Step 113 The S-CSCF directly connects the call service to the called foreign terminal C, establishes a call channel of the terminal M and the terminal C, ends the call, and releases the resource.
  • Figure ⁇ shows a block diagram of the core network system proposed in this embodiment, including a CS domain core network A, an IMS domain core network B, and an alien terminal C.
  • the CS domain core network A and the IMS domain core network B are connected through the MGCF/MGW B5.
  • the IMS domain B includes an S-CSCF module B1, an HSS B2, a network selection application server B3, an ENUM module B4, an MGCF/MGW unit B5, and an IM/POC server B6.
  • CS domain A includes MSC Al, HLR A2, SCP A3, and SMS/MMS Center A4.
  • the network selection application server B3 is specifically configured as a network selection device, and is disposed in the IMS domain B and interacts with the HLR A2 and the HSS B2, respectively, for acquiring the foreign terminal c from the HLR A2 and the HSS B2.
  • the registration status information and the network selection policy information are selected;
  • the network application server B3 is in communication connection with the S-CSCF B1, and is configured to select the network according to the registration status information and the network selection policy information instruction S-CSCF B1.
  • the ENUM is selected as the network selection device to perform the acquiring the terminal registration status information and the network selection policy information, determining the registration status information of the called foreign terminal, and selecting a core network domain for the foreign terminal.
  • a network selection application server is specifically configured in the IMS domain to perform the function of the network selection device.
  • the network application server B3 identifies that the foreign terminal C is registered in the IMS domain B and the CS domain A, and according to the network selection policy obtained from the HSS B2 (for example, the voice type call is the CS domain selection mode), it is necessary to select the CS.
  • the voice call initiated by the IMS domain B is routed to the CS domain A through the MGCF/MGW B5 for processing.
  • the SCP A3 of the CS domain core network A is further configured to interact with the HLR A2 and the HSS B2 to obtain the registration status information and the network selection policy information of the remote terminal C, and according to the registration status information and the network selection policy information. Choose the network.
  • the MMS call is the IMS domain selection mode (ie, the IMS domain is selected)
  • the MMS call initiated by the terminal in the CS domain A is routed to the IMS domain B through the SMS/MMS A4 for processing.
  • the HSS B2 is used to store the network selection policy information and the IMS domain B terminal registration status information; the HLRA2 is used to store the CS domain A terminal registration status information; if an external terminal uses the IMS domain B service, If the service of CS domain A is used, the state of the foreign terminal is registered at both HSS B2 and HLR A2.
  • SCPA3 interacts with HLRA2 and HSS B2, respectively, specifically that SCPA3 is in communication with HLR A2 and HSS B2, respectively, and network application server B3 is associated with HLR A2 and HSS, respectively.
  • the B2 interaction is specifically for the network selection application server B3 to communicate with the HLRA2 and the HSS B2, respectively.
  • the constituent modules are the same as those shown in Figure 7, except that HLR A2 and HSS B 2 are combined to form an integral device D; SCP A3 interacts with HLR A2 and HSS B2 respectively, specifically SCP A3 and the combined whole.
  • the device D communication connection, the network selection application server B3 interacts with the HLRA2 and the HSS B2 respectively, and specifically connects the network selection application server B3 with the integrated device D.
  • the solution provided by this embodiment is more suitable for the mobile communication system after the convergence.
  • the constituent modules are the same as those shown in FIG. 7.
  • the difference is that the HLRA2 and HSS B2 communication connections, the HLR A2 updates the CS domain terminal registration status information to the HSS B2, and the SCP A3 interacts with the HLRA2 and the HSS B2 respectively, specifically SCPA3 and
  • the HSS B2 communication connection can be used to obtain the CS domain terminal registration status information provided by HLRA2; the network selection application server B3 interacts with the HLR A2 and the HSS B2 respectively, and specifically selects the network application server B3 to communicate with the HSS B2, and the HLR A2 can be known.
  • the CS domain terminal registration status information provided.
  • the solution provided in this embodiment does not need to perform large-scale modification on the HLR and the HSS device, and also avoids the system complexity caused by multiple connections between the devices.
  • the HSS and the HLR can be realized only by setting the MAP interface in the HSS. connection.
  • the SCP A3 interacts with the HSS B2 or the whole device D through the MAP interface
  • the selected network application server B3 interacts with the HLRA2 through the MAP interface, and accesses the HSS B2 or the entire device D through the Sh interface.
  • the network selection policy preset in the HSS B2 may be a policy set by the user and/or a policy set by the operator, and the policy may include: a static policy, an operator-defined policy, a user-specified policy, and the like. .
  • MGCF/MGW B5 and IM/POC server B6 are required.
  • a certain functional improvement is made to be able to extract the E.164 number of the foreign terminal C in the special IMS domain number or the special CS domain number.
  • the routing object is determined by the prefix, and the E.164 number of the foreign terminal C is obtained by removing the prefix.
  • other algorithms may be used to form a special IMS domain number or a special CS domain number, and the corresponding algorithm is used to extract the E.164 number of the foreign terminal C, which does not affect the implementation of the technical solution provided by the present invention.
  • the core network system provided by the foregoing embodiment of the present invention can implement real-time and accurate network selection of the foreign terminal service according to the terminal registration status and the preset network selection policy.
  • the higher-capacity domain is processed, thus improving the user experience; at the same time, the state transition of the user is avoided, and the performance requirement of the system is lowered.
  • the embodiment of the present invention further provides a method for supporting the hetero-terminal selection network. Because the processing method of the foreign terminal as the calling party is the same as that of the ordinary IMS domain terminal or the CS domain terminal, it will not be described again. The following describes the processing method of the foreign terminal as the called party.
  • Step 5 is a processing method when a CS domain terminal initiates a call service to an external terminal, including: Step 1.
  • the SCP receives a call request.
  • Step 2 The SCP queries whether the called foreign terminal is registered in the CS domain, if yes, step 3 is performed, otherwise step 5 is performed;
  • Step 3 The SCP queries whether the called external terminal is registered in the IMS domain, if yes, step 4 is performed, otherwise step 6 is performed;
  • Step 4 The SCP queries the network selection policy information preset in the HSS, and determines the network selection mode of the call service. If the network selection mode is the IMS domain, go to step 5, otherwise go to step 6.
  • Step 5 The SCP generates a routing instruction that points to the special IMS domain number, and connects the call service to the IMS domain, and ends the call; the special IMS domain number carries the E.164 number of the called foreign terminal.
  • Step 6 The SCP indicates that the call service connection is performed in the CS domain, and the call ends. Since the voice service (real-time service) and the message service (non-real-time service) are handled by different gateways respectively in the call service initiated by the CS domain, they are further divided into two cases:
  • the SCP receives the call request sent by the MSC.
  • the terminal in the CS domain initiates a voice call
  • the SCP queries the called terminal to query the network selection policy information preset in the HSS in the case that both the CS domain and the IMS domain are registered, because the voice call is better in the CS domain. Therefore, the policy set by the operator is usually that the voice call is processed in the CS domain, and the SCP directly returns a routing instruction to the MSC, and the MSC establishes a call to the called terminal in the CS domain.
  • the IMS domain provides a better visual effect. Therefore, the user may specifically set the policy to be a voice call in the IMS domain.
  • Step 51 The SCP generates a special IMS domain number, where the special IMS domain number carries the E.164 number of the called foreign terminal.
  • Step 52a the SCP sends a routing instruction to the IMS to the IMS;
  • Step 53a the MSC connects the call service to the MGCF/MGW according to the routing instruction;
  • Step 54a MGCF/MGW from the special Extracting the E.164 number of the called foreign terminal from the IMS domain number and sending it to the S-CSCF;
  • Step 55a The S-CSCF parses the E.164 number into a SIP URI number, and establishes a call to the called foreign terminal.
  • Step 56a after the call is completed, ends.
  • the SCP receives a call request sent by the SMS/MMS. For example, when the terminal of the CS domain sends a short message to the called terminal, it is reported to the SCP by the SMS.
  • the SCP queries the called terminal to query the network selection policy information preset in the HSS in the case that both the CS domain and the IMS domain are registered. Since the short message service can be well supported in the CS domain, the static policy is usually When the message is processed in the CS domain, the SCP directly returns a routing instruction to the SMS, and the SMS sends the short message to the called foreign terminal in the CS domain. However, when the calling party initiates the multimedia messaging service, the multimedia support provided by the IMS domain is relatively rich. Therefore, the operator setting policy is usually performed by the multimedia message service in the IMS domain, and the step 5 is specifically:
  • Step 51b The SCP generates a special IMS domain number, where the special IMS domain number carries the E.164 number of the called foreign terminal.
  • Step 52b the SCP sends a routing instruction to the special IMS domain number to the SMS/MMS;
  • Step 53b the SMS/MMS connects the call service to the IM/POC server according to the routing instruction; and sends the E.164 number to the S-CSCF;
  • Step 55b The S-CSCF parses the E.164 number into a SIP URI number, and establishes a call to the called foreign terminal.
  • Step 56b after the call is completed, it ends.
  • the processing method when the IMS domain terminal initiates a call service to the remote terminal includes:
  • Step 1 ' the S-CSCF of the IMS domain terminal sends the call request to the network selection application server;
  • Step 2' the network selection application server queries whether the called foreign terminal is registered in the IMS domain, if yes, step 3' is performed, otherwise the step is performed 5';
  • Step 3 ′ the network selection application server queries whether the called foreign terminal is registered in the CS domain, if yes, step 4 ′, otherwise step 7 ′;
  • Step 4 ′ the network selection application server queries the network selection policy information preset in the HSS, and determines the network selection mode of the call service. If the network selection mode is the CS domain, step 5 ′ is performed, otherwise step 7 ′ is performed; Step 5 ′, the network selection application server generates a special CS domain number and sends it to the S-CSCF, where the special CS domain number carries the E.164 number of the called foreign terminal;
  • Step 6 ′ the S-CSCF connects the call service to the CS domain according to the special CS domain number, End after completing the call;
  • Step 7' Selecting the network application server instruction
  • the S-CSCF performs the call service connection in the IMS domain, and ends when the call is completed.
  • the call service is voiced.
  • the step 6' is specifically:
  • Step 61a' the S-CSCF sends a routing instruction to the special CS domain number to the MGCF/MGW;
  • End E.164 number connecting the call service to the MSC
  • Step 63 a' the MSC establishes a call to the called foreign terminal according to the E.164 number; Step 64a', after the call is completed, ends.
  • the step 6' is specifically:
  • Step 61b' the S-CSCF sends a routing instruction to the special CS domain number to the IM/POC server;
  • Step 62b the IM/POC server extracts the E.164 number of the called foreign terminal from the special CS domain number, and connects the call service to the SMS/MMS;
  • Step 63b' the SMS MMS establishes a call to the called foreign terminal according to the E.164 number.
  • Step 64b' after the call is completed, ends.
  • the communication mode is a conventional intra-domain or inter-domain communication, and details are not described herein again.
  • the embodiment of the present invention further provides an apparatus for calling an alien terminal in a core network system, including: an acquiring unit, configured to acquire a CS domain terminal registration state information and an IMS domain terminal registration state information in the core network system, and select Network policy information; determining unit, based on the acquired CS domain The terminal registration status information and the IMS domain terminal registration status information determine the registration status information of the called foreign terminal; the selecting unit is configured to use the obtained network selection policy information and the determined registration status information from the core network system. Selecting a core domain for the foreign terminal to provide the call service.
  • the selecting unit specifically includes: a selecting subunit, configured to: when the determined registration status information is that the called foreign terminal is only registered in the IMS domain, select the IMS domain to provide a call service for the foreign terminal; The status information is that when the called foreign terminal is only registered in the CS domain, the CS domain is selected to provide the call service for the foreign terminal; and the determined registration status information is that the called foreign terminal is registered in both the IMS domain and the CS domain. And selecting, according to the network selection policy information, a core network domain to provide a call service for the foreign terminal.
  • the selecting unit when the CS domain is selected to provide the call service for the remote terminal, the selecting unit further includes: a determining subunit, configured to determine whether the call service is a real-time service; and a connection sub-unit, configured to And transmitting the call service to the foreign terminal through the MSC of the CS domain; and when the determination result is no, the call service is connected to the foreign terminal by using an SMS MMS of the CS domain.
  • the selecting unit when the IMS domain is selected to provide the call service for the remote terminal, the selecting unit further includes: a determining subunit, configured to determine whether the call service is a real-time service; and a connection sub-unit, configured to determine And transmitting, by the MGCF/MGW of the IMS domain, to the foreign terminal; and when the determination result is no, connecting the call service to the IM/POC server of the IMS domain to the Exotic terminal.

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Description

支持异域终端选网的核心网系统、 装置及呼叫方法
技术领域
本发明涉及移动通信技术领域， 特别涉及一种支持异域终端选网的核心 网系统、 装置及呼叫方法 背景技术
传统的核心网系统为电路交换（CS, Circuit Switch )域， CS域中主要提 供端到端的语音、 可视电话和短消息等基本业务。 随着移动通信领域竟争的 加剧， 运营商需要通过新的差异化业务来吸引用户， 为此在传统的核心网系 统中引入了分组交换（PS， Packet Switch )域， PS域中通过 IP传输提供新的 数据业务， 例如多媒体信息服务（MMS, Multimedia Messaging Service )、 内 容浏览等， 但是由于网络带宽限制、 终端限制、 贫乏的用户体验、 不明朗的 计费等因素使得这些基于 IP的数据业务没有得到成功的应用。
为了克服上述问题， 第三代合作伙伴计划 （3GPP , 3rd Generation Partnership Project )在 Release 5版本中提出了 IP 多媒体子系统（IMS, IP Multimedia Subsystem ), IMS叠加于 PS域之上并应用 PS域来进行多媒体信 号的承载和传输。 IMS建立了对呼叫 /会话进行控制的软交换平台， 通过会话 协商和管理、 QoS管理、 移动性管理等技术实现实时的、 端到端的通信业务； IMS还为运营商提供了： 非实时性的端到端业务， 例如聊天（Chat )、 即时消 息 （IM， Instant Message ) 业务； 多方业务， 例如多媒体会议 ( Multimedia Conferencing ), 聊天室（Chat Rooms )业务、 无线一键通业务 ( POC, Push to talk over Cellular ); 以及一些服务器到用户的业务， 例如动态推送业务 ( Dynamic Push Services )> 点击拨号 （ Click to Dial )等。 可以说 IMS是真正 可以提升用户体验、 提高运营商收益的核心网技术。
现有技术中， 核心网系统的 CS域（特别是智能网）与 IMS域之间的网 络架构如图 1所示， 其中业务控制点 （SCP, Service Control Point )仅在智能 网业务中发挥作用。 处于 CS域的终端对处于 IMS域的终端进行呼叫时， 由 HLR识别并指令移动交换中心 （MSC， Mobile Switching Centre ), 将呼叫转 移到媒体网关控制功能 ( MGCF， Media Gateway Control Function ) /媒体网关 ( MGW, Media Gateway )单元， 进一步在 IMS域中， 由服务-呼叫会话控制 功能（S-CSCF, Service-Call Session Control Function )模块、 实现终端号码到 通用定位连接 ( URL ) 的映射的电子号码 ( Enum, Electronic Numbering )模 块以及归属用户服务器（HSS, Home Subscriber Server )进行处理；而处于 IMS 域的终端对处于 CS域的终端进行呼叫时，则由 HSS识别并指令 S-CSCF模块， 将呼叫转移到 MGCF单元， 进一步由 MSC实现在 CS域中的呼叫处理。 对于 IMS域终端和 CS域终端彼此独立的情况，现有核心网系统能够满足准确呼叫 的需求。
但随着终端技术的不断进步， 出现了可以兼容 2代 CS、 GPRS和 IMS域 业务的终端以及兼容 3代 CS、 GPRS和 IMS域业务的终端， 这些终端能够支 持在 CS域、 PS域以及 IMS域中的不同业务， 采用统一的 E.164号码， 被称 为异域通用终端 （简称异域终端 （ Dual Domain Terminal ) )。 虽然异域终端进 行业务发起时能够自主选择核心网域， 但当异域终端作为接收终端时， 现有 的核心网系统架构就无法判断通过哪一种核心网域来提供对业务的支持。
为了应对上述无法选择核心网域（筒称选网） 的问题， 一种简单的技术 方案是主叫终端在哪一个核心网域发起呼叫， 就通过该核心网域提供业务支 持； 另一种简单的技术方案是由系统随机选择核心网域来提供对业务的支持。 但由于异域终端不一定同时在不同的核心网域进行了注册， 因此上述两种方 式都可能导致被选择的核心网域无法找到被叫异域终端， 因此导致呼叫业务 的失败或者延迟； 此外， 即便被选择的核心网域可以找到被叫异域终端， 上 述两种方式也可能使得在 CS域盾量较好的语音业务最终通过 IMS域建立连 接， 或者使得在 IMS功能较全面的多媒体业务最终通过 CS域发送等， 从而 导致用户实际的使用感受不佳。 还有一种选择核心网域的技术方案是： 异域终端通过不断在各种核心网 域中进行注册切换， 保证在某一时刻仅在一个核心网域中状态有效来实现准 确、 即时地选择核心网域。 但这种技术方案需要核心网系统不断地对用户的 状态进行切换以及反复配置状态信息， 造成了效率的降^ ί氏和对系统性能要求 的提高； 同时， 也无法发挥异域通用终端能同时支持异域业务的优势。 发明内容
本发明实施例提供一种支持异域终端选网的核心网系统、 装置及呼叫方 法， 以能准确、 即时地为被呼叫的异域终端选择核心网域， 且同时不会提高 对系统性能的要求。
本发明实施例提出一种支持异域终端选网的呼叫方法， 包括：
获取核心网系统中的 CS域终端注册状态信息和 IMS域终端注册状态信 息以及选网策略信息；
基于获取到的 CS域终端注册状态信息和 IMS域终端注册状态信息， 确 定被呼叫的异域终端的注册状态信息；
基于获取到的选网策略信息以及确定的注册状态信息， 从所述核心网系 统中为所述异域终端选择一个核心网域提供所述呼叫业务。
本发明实施例提出一种支持异域终端选网的装置， 包括：
获取单元， 用于获取核心网系统中的 CS域终端注册状态信息和 IMS域 终端注册状态信息以及选网策略信息；
确定单元， 用于基于获取到的 CS域终端注册状态信息和 IMS域终端注 册状态信息， 确定被呼叫的异域终端的注册状态信息；
选择单元， 用于基于获取到的选网策略信息以及确定的注册状态信息， 从所述核心网系统中为所述异域终端选择一个核心网域提供所述呼叫业务。
本发明实施例提出的一种核心网系统， 包括 CS域核心网、 IMS域核心网 和异域终端， 且
所述 CS域核心网中的 HLR用于保存 CS域终端注册状态信息； 所述 IMS域核心网中的 HSS用于保存选网策略信息和 IMS域终端注册状 态信息；
所述 IMS域核心网中构建的选网应用服务器分别与所述 HSS和 HLR交 互， 用于获取核心网系统中的 CS域终端注册状态信息和 IMS域终端注册状 态信息以及选网策略信息； 基于获取到的 CS域终端注册状态信息和 IMS域 终端注册状态信息， 确定被呼叫的异域终端的注册状态信息； 并基于获取到 的选网策略信息以及确定的注册状态信息， 从所述核心网系统中为所述异域 终端选择一个核心网域提供所述呼叫业务。
本发明实施例还提出一种核心网系统， 包括 CS域核心网、 IMS域核心网 和异域终端， 且
所述 CS域核心网中的 HLR用于保存 CS域终端注册状态信息； 所述 IMS域核心网中的 HSS用于保存选网策略信息和 IMS域终端注册状 态信息；
所述 CS域核心网中的 SCP分别与所述 HSS和 HLR交互，用于获取核心 网系统中的 CS域终端注册状态信息和 IMS域终端注册状态信息以及选网策 略信息； 基于获取到的 CS域终端注册状态信息和 IMS域终端注册状态信息， 确定被呼叫的异域终端的注册状态信息； 并基于获取到的选网策略信息以及 确定的注册状态信息， 从所述核心网系统中为所述异域终端选择一个核心网 域提供所述呼叫业务。
本发明实施例提出的支持异域终端选网的方案， 通过获取被叫异域终端 的注册状态信息以及选网策略信息， 并基于获取到的信息， 从该核心网系统 中为被呼叫的异域终端选择一个核心网域提供该呼叫服务， 以能准确、 即时 地为被呼叫的异域终端选择核心网域， 从而提升了用户体验； 同时避免了异 域终端反复进行状态变换， 从而降低了对系统性能的要求。 附图说明
图 1为有技术中 CS域与 IMS域通信的系统框图； 图 2为本发明实施例一提出的核心网系统的框图；
图 3为本发明实施例二提出的核心网系统的框图；
图 4为本发明实施例三提出的核心网系统的框图；
图 5为本发明实施例四提出的支持异域终端选网的呼叫方法的流程图； 图 6为本发明实施例五提出的支持异域终端选网的呼叫方法的流程图； 图 7为本发明实施例六提出的核心网系统的框图；
图 8为本发明实施例七提出的核心网系统的框图；
图 9为本发明实施例八提出的核心网系统的框图；
图 10为本发明实施例九提出的支持异域终端选网的呼叫方法的流程图； 图 11为本发明实施例十提出的支持异域终端选网的呼叫方法的流程图。 具体实施方式
为了真正发挥异域终端兼容 CS域及 IMS域业务的优势， 避免无法准确 选网或者反复注册注销的缺陷， 提高选网命中率， 本发明实施例提供了一种 支持异域终端选网的方案， 该方案通过获取被叫异域终端的注册状态信息和 选网策略信息， 并基于获取到的信息， 从该核心网系统中为被呼叫的异域终 端选择一个核心网域提供该呼叫服务， 以能准确、 即时地为被呼叫的异域终 端选择核心网域， 且同时不会提高对系统性能的要求。
本发明实施例提出的支持异域终端选网的呼叫方法， 包括： 获取核心网 系统中的 CS域终端注册状态信息和 IMS域终端注册状态信息以及选网策略 信息； 基于获取到的 CS域终端注册状态信息和 IMS域终端注册状态信息， 确定被呼叫的异域终端的注册状态信息； 基于获取到的选网策略信息以及确 定的注册状态信息， 从所述核心网系统中为所述异域终端选择一个核心网域 提供所述呼叫业务。
较佳地， 基于获取到的选网策略信息和确定的注册状态信息， 为异域终 端选择一个核心网域提供呼叫业务包括： 在确定的注册状态信息为被呼叫的 异域终端只在 IMS域注册时，选择所迷 IMS域为所述异域终端提供呼叫业务； 在确定的注册状态信息为被呼叫的异域终端只在 CS域注册时， 选择所述 CS 域为所述异域终端提供呼叫业务； 在确定的注册状态信息为被呼叫的异域终 端在 IMS域和 CS域均注册时， 基于所述选网策略信息为所述异域终端选择 一个核心网域提供呼叫业务。
较佳地， 当选择 CS域为异域终端提供呼叫业务时， 还包括： 判断所述呼 叫业务是否为实时业务； 当判断结果为是时， 将所述呼叫业务通过所述 CS域 的 MSC接续到所述异域终端； 当判断结果为否时， 将所述呼叫业务通过所述 CS域的 SMS/MMS接续到所述异域终端。
较佳地， 当选择 IMS域为异域终端提供呼叫业务时， 还包括： 判断所述 呼叫业务是否为实时业务； 当判断结果为是时，将所述呼叫业务通过所述 IMS 域的 MGCF/MGW接续到所述异域终端； 当判断结果为否时， 将所述呼叫业 务通过所述 IMS域的 IM/POC服务器接续到所述异域终端。
下面结合说明书附图详细描述本发明的具体实施方式。
实施例一：
图 2示出了本实施例提出的核心网系统的框图，包括 CS域核心网 A、 IMS 域核心网 B、 以及异域终端 C。 其中， CS域核心网 A与 IMS域核心网 B通 过 MGCF/MGW B4连接。所谓异域终端 C是指使用 2代的 SIM+ISIM复合卡 的终端或者使用 3代的 USIM+ISIM复合卡的终端。 异域终端 C在同一 E.164 号码的情况下， 就既可以接入 IMS域使用 IMS业务， 又可以接入 CS域使用 CS业务， 且可能同时使用两个域的业务。
例如， 异域终端 C使用 2代 SIM+ISIM复合卡时， 接入 2代网络就可使 用所有的 2代 CS域和 PS域业务， 也能通过 2代 GPRS接入 IMS域， 以使用 非实时类的 IMS业务（如即时消息）和实时类的 IMS业务（如多媒体会话）； 异域终端 C使用 3代 USIM+ISIM复合卡时，接入 3代网络就可使用所有的 3 代 CS域和 PS域业务， 也能通过 3代 GPRS接入 IMS域， 以使用非实时类的 IMS业务（如即时消息）和实时类的 IMS业务（如多媒体会话）。
在本实施例提出的核心网系统中， IMS域 B包括 S-CSCF模块 B 1、 HSS B2、 ENUM模块 B3、 以及 MGCF/MGW单元 B4。 CS域 A中包括 MSC Al , HLR A2以及短消息业务（ SMS, Short Message Service ) /多媒体消息业务（ MMS， Multimedia Message Service ) 中心 A3。
在现有技术中， S-CSCF模块 B1通过在 HSS B2中查询归属信息， 再通 过 ENUM B3获取 E.164号码与 SIP URI号码的解析映射关系， 即可实现直接 与 IMS域 B中异域终端 C的通信，或者通过 MGCF/MGW B4实现与 CS域 A 中异域终端 C的通信。
在本实施例所提供的核心网系统中， IMS域 B的 HSS B2用于保存选网策 略信息和 IMS域终端注册状态信息，这种选网策略信息是一种全网策略信息， 即不进行业务区分， 而简单设置为是 CS域 A承载或者 IMS域 B承载。
IMS域 B的 ENUM模块 B3分别与所述 HSS B2和 HLR A2交互，用于获 取异域终端 C的注册状态信息及选网策略信息， 并才艮据获取的注册状态信息 及选网策略信息确定是否返回 SIP URI号码。
例如， 当 ENUM B3识别出异域终端 C同时在 IMS域 B和 CS域 A中注 册， 且从 HSS B2获取的选网策略为 CS域选网方式时， 向 S-CSCF返回解析 失败指令， 则 S-CSCF自动将呼叫路由到 MGCF/MGW。
在本发明实施例中， HSS B2用于保存选网策略信息和 IMS域 B终端注册 状态信息； HLRA2用于保存 CS域 A终端注册状态信息； 如果一个异域终端 既使用了 IMS域 B的业务， 也使用了 CS域 A的业务， 则该终端 C的状态是 同时在 HSS B2和 HLR A2注册。
需要注意的是， 本发明实施例仅以由 HSS存储选网策略信息和 IMS域终 端注册状态信息， 由 HLR存储 CS域终端注册状态信息为例来说明， 当然选 网策略信息和终端注册状态信息也可以存储在其它实体中。
此外， 本实施例中用于执行获取终端注册状态信息和选网策略信息， 确 定被呼叫的异域终端的注册状态信息， 以及为异域终端选择一个核心网域提 供呼叫业务的选网设备以 ENUM为例， 当然也可以选择其它实体作为选网设 备。 在本实施例中， ENUM B3分别与 HLR A2和 HSS B2交互具体为 ENUM B3分别与 HLR A2和 HSS B2通信连接。 具体地， IMS域 B的 ENUM B3通 过 MAP接口与 HLR A2通信连接。
同时， 在本发明实施例中， MGCF/MGW B4可以进行一定的功能改进， 以能够区分实时业务和非实时业务， 并将实时业务发送到 MSC, 将非实时的 短消息业务发送到 SMS/MMS, 从而可避免 MSC转发 SMS/MMS的问题， 并 进一步提高效率。
实施例二：
参见图 3 , 其构成模块与图 2所示相同， 区别在于所述 HLR A2与所述 HSS B2合设，构成一个整体设备 D; ENUM B3分别与 HLR A2和 HSS B2交 互具体为 ENUM B3与合设的整体设备 D通信连接。
由于 HLRA2与 HSS B2合设，通过内部接口连接是移动通信网络融合的 发展趋势， 因此， 本实施例所提供的方案更加适合于融合后的移动通信系统。
实施例三：
参见图 4， 其构成模块与图 2所示相同， 区别在于 HLR A2和 HSS B2通 信连接， HLR A2向 HSS B2更新 CS域终端注册状态信息， 则 ENUM B3分 别与 HLR A2和 HSS B2交互具体为 ENUM B3与 HSS B2通信连接， 间接获 知 HLR A2所提供的 CS域终端注册状态信息。
本实施例所提供的方案无需对 HLR和 HSS设备进行大规模改造，也避免 了设备之间的多重连接造成的系统复杂度增高，仅仅通过在 HSS中设置 MAP 接口， 即可实现 HSS与 HLR的连接。
需要注意的是， 当异域终端 C作为主叫时， 由于可以主动选网， 因此继 续使用现有技术的核心网系统就能够满足要求。但当异域终端 C作为被叫时， 则需要通过本发明上述实施例所提供的核心网系统， 依据此时异域终端 C的 注册状态信息和预设的选网策略，确定由 ENUM B3所返回的指令，进而确定 呼叫被路由到 IMS域 B或者 2/3代 CS域 A其中之一加以处理。
可见， 通过本发明上述实施例所提供的核心网系统， 能够获知被叫异域 终端当前在不同核心网域的注册状态， 进而提高选网命中的准确度； 同时， 避免了异域终端反复进行的状态变换， 降低了对系统性能的要求。
基于上述支持异域终端选网的核心网系统， 本发明实施例还提供了支持 异域终端选网的呼叫方法。由于异域终端作为主叫的处理方法，与普通的 IMS 域终端或者 CS域终端没有区别， 因此不再赘述， 下面以异域终端作为被叫的 处理方法加以阐述。
实施例四
在本实施例中， 对于 CS域主叫发起的业务就在 CS域执行， 假设被叫用 户未在 CS域注册， 则再由 HLR指令路由到 IMS域执行。
本实施例主要研究 IMS域终端向异域终端发起呼叫业务时的处理方法， 参见图 5， 包括：
步骤 1、 IMS域的 S-CSCF向 ENUM请求解析被叫号码；
步骤 2、 ENUM查询被叫异域终端是否在 IMS域注册， 是则执行步骤 3 , 否则执行步骤 5;
步骤 3、 ENUM查询被叫异域终端是否在 CS域注册， 是则执行步骤 4, 否则执行步骤 7;
步骤 4、 ENUM查询 HSS中预设的选网策略信息， 若为 CS域选网方式 (即选择 CS域） 时， 执行步骤 5， 否则执行步骤 7;
步骤 5、 ENUM向 S-CSCF返回解析失败指令；
步骤 6、 S-CSCF将呼叫业务通过 MGCF/MGW接续到 CS域的被叫异域 终端， 完成呼叫后结束；
步骤 7、 ENUM向 S-CSCF返回解析后的 SIP URI号码；
步骤 8、 S-CSCF将呼叫业务直接接续到被叫异域终端， 完成呼叫后结束。 实施例五
为了进一步提高效率， MGCF/MGW增加了业务的识别功能时，参见图 6， 包括：
步骤 101、 IMS城终端 M向 S-CSCF发起呼叫， 被叫方为异域共号终端 (异域终端） C的 E.164号码；
步骤 102、 S-CSCF向 ENUM请求解析被叫的 E.164号码；
步骤 103、 ENUM查询被叫异域终端 C是否在 IMS域注册， 是则执行步 骤 104， 否则执行步骤 106;
步骤 104、 ENUM查询被叫异域终端 C是否在 CS域注册，是则执行步骤 105 , 否则执行步骤 112;
步骤 105、 ENUM查询 HSS中预设的选网策略信息， 若为 CS域选网方 式时， 执行步骤 106， 否则执行步骤 112;
步骤 106、 ENUM向 S-CSCF返回解析失败指令；
步骤 107、 S-CSCF将呼叫业务接续到 MGCF/MGW;
步骤 108、 MGCF/MGW判断所述呼叫业务是否为实时业务， 是则执行步 骤 109， 否则执行步骤 110;
步驟 109、 MGCF/MGW将呼叫业务接续到 MSC， 并执行步骤 111 ;
步骤 110、 MGCF/MGW将呼叫业务接续到 SMS/MMS；
步骤 111、 MSC或 SMS/MMS将呼叫业务接续到被叫异域终端 C, 建立 了终端 M和终端 C的呼叫信道， 完成呼叫后结束；
步骤 112、 ENUM向所述 S-CSCF返回解析后的 SIP URI号码；
步骤 113、 S-CSCF将呼叫业务直接接续到被叫异域终端 C, 建立了终端 M和终端 C的呼叫信道， 完成呼叫后结束， 并释放资源。
下面参照附图介绍本发明实施例提出的另一种核心网系统。
实施例六：
图 Ί示出了本实施例提出的核心网系统的框图，包括 CS域核心网 A, IMS 域核心网 B、 以及异域终端 C。 其中， CS域核心网 A与 IMS域核心网 B通 过 MGCF/MGW B5连接。
在本实施例提出的核心网系统中， IMS域 B包括 S-CSCF模块 B l , HSS B2, 选网应用服务器 B3， ENUM模块 B4， MGCF/MGW单元 B5 , IM/POC 服务器 B6。 CS域 A中包括 MSC Al , HLR A2, SCP A3以及 SMS/MMS中心 A4。
在本实施例中， 特别设置了选网应用服务器 B3作为选网设备， 设于 IMS 域 B中并分别与 HLR A2和 HSS B2交互， 用于从 HLR A2和 HSS B2获取所 述异域终端 c的注册状态信息及选网策略信息；选网应用服务器 B3与 S-CSCF B1通信连接，用于根据注册状态信息及选网策略信息指令 S-CSCF B1进行选 网。
需要说明的是， 实施例一中是选取 ENUM作为选网设备来执行获取终端 注册状态信息和选网策略信息、 确定被呼叫的异域终端的注册状态信息、 以 及为异域终端选择一个核心网域提供呼叫业务的； 而本实施例中则是在 IMS 域中特别设置一种选网应用服务器， 以执行选网设备的功能。
例如， 当选网应用服务器 B3识别出异域终端 C同时在 IMS域 B和 CS 域 A中注册， 且根据从 HSS B2获取的选网策略（比如语音类呼叫为 CS域选 网方式）获知需要选择 CS域时，将 IMS域 B发起的语音呼叫通过 MGCF/MGW B5路由到 CS域 A进行处理。
本实施例中还设置 CS域核心网 A的 SCP A3分别与 HLR A2和 HSS B2 交互， 用于获取异域终端 C的注册状态信息及选网策略信息， 并根据注册状 态信息及选网策略信息进行选网。
例如， 当 SCP A3识别出异域终端 C同时在 IMS域 B和 CS域 A中注册， 且根据从 HSS B2获取的选网策略（比如彩信类呼叫为 IMS域选网方式（即 选择 IMS域 ) ), 获知需要选择 IMS域时， 将 CS域 A中的终端发起的彩信呼 叫通过 SMS/MMS A4路由到 IMS域 B进行处理。
在本实施例中， HSS B2用于保存选网策略信息和 IMS域 B终端注册状 态信息； HLRA2用于保存 CS域 A终端注册状态信息； 如果一个异域终端即 使用了 IMS域 B的业务， 也使用了 CS域 A的业务， 则该异域终端的状态是 同时在 HSS B2和 HLR A2注册。
在本实施例中， SCPA3分别与 HLRA2和 HSS B2交互具体为 SCPA3分 别与 HLR A2和 HSS B2通信连接，选网应用服务器 B3分别与 HLR A2和 HSS B2交互具体为选网应用服务器 B3分别与 HLRA2和 HSS B2通信连接。
实施例七：
参见图 8， 其构成模块与图 7所示相同， 区别在于 HLR A2与 HSS B2合 设，构成一个整体设备 D; SCP A3分别与 HLR A2和 HSS B2交互具体为 SCP A3与合设的整体设备 D通信连接，选网应用服务器 B3分别与 HLRA2和 HSS B2交互具体为选网应用服务器 B3与合设的整体设备 D通信连接。
由于 HLR与 HSS合设，通过内部接口连接是移动通信网络融合的发展趋 势， 因此， 本实施例所提供的方案更加适合于融合后的移动通信系统。
实施例八：
参见图 9， 其构成模块与图 7所示相同， 区别在于 HLRA2和 HSS B2通 信连接， HLR A2向 HSS B2更新 CS域终端注册状态信息， 则 SCP A3分别与 HLRA2和 HSS B2交互具体为 SCPA3与 HSS B2通信连接，即可获知 HLRA2 所提供的 CS域终端注册状态信息；选网应用服务器 B3分别与 HLR A2和 HSS B2交互具体为选网应用服务器 B3与 HSS B2通信连接， 即可获知 HLR A2 所提供的 CS域终端注册状态信息。
本实施例所提供的方案无需对 HLR和 HSS设备进行大规模改造，也避免 了设备之间的多重连接造成的系统复杂度增高，仅仅通过在 HSS中设置 MAP 接口， 即可实现 HSS与 HLR的连接。
在上述实施例中， SCP A3通过 MAP接口与 HSS B2或整体设备 D交互， 选网应用服务器 B3通过 MAP接口与 HLRA2交互，通过 Sh接口访问 HSS B2 或者整体设备 D。
在本发明实施例中， HSS B2中预设的选网策略可以是用户设定的策略和 /或运营商设定的策略， 该策略可能包括： 静态策略、 运营商制定策略、 用户 指定策略等。
这些策略不仅可以保存在 HSS B2中， 也可以在选网应用服务器 B3中备 份， 这样可避免选网应用服务器 B3再向 HSS B2获取选网策略的交互。
在本发明上述实施例中， MGCF/MGW B5以及 IM/POC服务器 B6需要 进行一定的功能改进， 以能够在特殊 IMS域号码或者特殊 CS域号码中提取 异域终端 C的 E.164号码。 比如， 设置特殊 IMS域号码或者特殊 CS域号码 为前缀加上正常的 E.164号码，则通过前缀确定路由对象，去掉前缀就得到了 异域终端 C的 E.164号码。 当然， 也可以采用其他算法形成特殊 IMS域号码 或者特殊 CS域号码， 再采用相应的算法提取异域终端 C的 E.164号码， 不影 响本发明所提供的技术方案的实施。
可见， 通过本发明上述实施例所提供的核心网系统， 能够根据终端注册 状态和预设的选网策略实现对异域终端业务的即时、 准确选网； 由于通过选 网策略能够为呼叫业务选择支持能力较高的域来处理， 因此提高了用户的使 用感受； 同时， 避免了用户反复进行的状态变换， 降低了对系统性能的要求。
基于上述支持异域终端选网的核心网系统， 本发明实施例还提供了支持 异域终端选网的方法。 由于异域终端作为主叫的处理方法， 与普通的 IMS域 终端或者 CS域终端没有区别， 因此不再赘述。 下面就异域终端作为被叫的处 理方法加以阐述。
实施例九
图 5为 CS域终端向异域终端发起呼叫业务时的处理方法， 包括： 步骤 1、 SCP接收到呼叫请求；
步骤 2、 SCP查询被叫异域终端是否在 CS域注册， 是则执行步骤 3， 否 则执行步驟 5;
步骤 3、 SCP查询被叫异域终端是否在 IMS域注册， 是则执行步骤 4， 否 则执行步骤 6;
步骤 4、 SCP查询 HSS中预设的选网策略信息， 并确定所述呼叫业务的 选网方式， 若为 IMS域选网方式时， 执行步骤 5， 否则执行步骤 6;
步骤 5、 SCP生成指向特殊 IMS域号码的路由指令， 将呼叫业务接续到 IMS 域， 呼叫完成后结束； 所述特殊 IMS 域号码中携带有被叫异域终端的 E.164号码；
步骤 6、 SCP指示在 CS域进行呼叫业务接续， 完成呼叫后结束。 由于 CS域发起的呼叫业务中，语音类业务（实时业务）与消息类业务（非 实时业务）分别由不同的网关处理， 因此进一步分为两种情况：
一种情况是： 当步骤 1中所述呼叫业务为语音呼叫时， SCP接收到 MSC 发送的呼叫请求。 例如， CS域的终端发起语音通话， SCP查询到被叫终端同 时在 CS域和 IMS域都注册的情况下， 查询 HSS中预设的选网策略信息， 由 于语音通话在 CS 域中效果较好， 因此运营商设置的策略通常为语音通话在 CS域处理， 则 SCP直接返回路由指令给 MSC, 由 MSC在 CS域中建立到被 叫终端的呼叫。
但当被叫发起的是可视的语音通话时， 由于 IMS域提供的可视化效果较 好， 因此可能用户特别设定策略为可视的语音通话在 IMS域处理， 则所述步 骤 5具体为：
步骤 51a、 SCP生成特殊的 IMS域号码， 所述特殊 IMS域号码中携带有 被叫异域终端的 E.164号码；
步骤 52a、 SCP将指向所述特殊的 IMS域号码的路由指令发送给 MSC; 步骤 53a、 MSC根据所述路由指令， 将呼叫业务接续到 MGCF/MGW; 步驟 54a、MGCF/MGW从所述特殊的 IMS域号码中提取被叫异域终端的 E.164号码， 并发送给 S-CSCF;
步骤 55a、 S-CSCF将 E.164号码解析为 SIP URI号码， 并建立到被叫异 域终端的呼叫；
步骤 56a、 呼叫完成后， 结束。
另外一种情况是， 当所述步骤 1中的呼叫业务为消息类业务时，所述 SCP 接收到 SMS/MMS发送的呼叫请求。例如， 当 CS域的终端向被叫终端发送短 信， 是由 SMS上报给 SCP。
SCP查询到被叫终端同时在 CS域和 IMS域都注册的情况下， 查询 HSS 中预设的选网策略信息， 由于短消息业务在 CS域中就能够得到良好的支持， 因此静态策略通常为通消息在 CS域处理，则 SCP直接返回路由指令给 SMS， 由 SMS在 CS域中将短消息发送给被叫异域终端。 但当主叫发起的是多媒体短信业务时， 由于 IMS域提供的多媒体支持比 较丰富， 因此运营商设定策略通常为多媒体短信业务在 IMS域处理， 则所述 步骤 5具体为：
步骤 51b、 SCP生成特殊的 IMS域号码， 所述特殊 IMS域号码中携带有 被叫异域终端的 E.164号码；
步骤 52b、 SCP 将指向所述特殊的 IMS 域号码的路由指令发送给 SMS/MMS;
步骤 53b、 SMS/MMS根据所述路由指令， 将呼叫业务接续到 IM/POC服 务器； 的 E.164号码， 并发送给 S-CSCF;
步骤 55b、 S-CSCF将 E.164号码解析为 SIP URI号码， 并建立到所述被 叫异域终端的呼叫；
步骤 56b、 呼叫完成后， 结束。
实施例十
参见图 6， 为当 IMS域终端向异域终端发起呼叫业务时的处理方法， 包 括：
步骤 1'、 IMS域终端的 S-CSCF将呼叫请求发送到选网应用服务器； 步骤 2'、 选网应用服务器查询被叫异域终端是否在 IMS域注册， 是则执 行步骤 3', 否则执行步骤 5'；
步骤 3'、 选网应用服务器查询所述被叫异域终端是否在 CS域注册， 是则 执行步骤 4'， 否则执行步骤 7'；
步骤 4'、 选网应用服务器查询 HSS中预设的选网策略信息， 并确定所述 呼叫业务的选网方式，若为 CS域选网方式时，执行步骤 5'，否则执行步骤 7'； 步骤 5'、 选网应用服务器生成特殊 CS域号码并发送给 S-CSCF, 所述特 殊 CS域号码中携带有所述被叫异域终端的 E.164号码；
歩骤 6'、 S-CSCF根据所述特殊 CS域号码， 将呼叫业务接续到 CS域， 完成呼叫后结束；
步骤 7'、 选网应用服务器指令 S-CSCF在 IMS域进行呼叫业务接续， 完 成呼叫后结束。
由于 IMS域发起的呼叫业务中， 实时业务（如语音类业务） 与非实时业 务（如消息类业务）也分别由不同的网关处理， 因此同样分为两种情况： 当所述呼叫业务为语音类业务时， 所述步骤 6'具体为：
步骤 61a'、 S-CSCF 将指向所述特殊的 CS 域号码的路由指令发送给 MGCF/MGW;
端的 E.164号码， 将呼叫业务接续到 MSC;
步骤 63 a'、 MSC根据所述 E.164号码，建立到所述被叫异域终端的呼叫； 步骤 64a'、 呼叫完成后， 结束。
当所述呼叫业务为消息类业务时， 所述步骤 6'具体为：
步骤 61b'、 S-CSCF 将指向所述特殊的 CS 域号码的路由指令发送给 IM/POC服务器；
步骤 62b'、 IM/POC服务器从所述特殊的 CS域号码中提取所述被叫异域 终端的 E.164号码， 将呼叫业务接续到 SMS/MMS;
步骤 63b'、 SMS MMS根据所述 E.164号码， 建立到所述被叫异域终端的 呼叫 · 步骤 64b'、 呼叫完成后， 结束。
由于当用户接入 IMS域使用时， 具备普通 IMS域终端的正常业务功能， 当用户接入 CS域使用时， 具备普通 CS域终端的正常业务功能， 因此， 如果 异域终端仅在一个域中注册， 则通信方式为常规的域内或者域间通信， 这里 不再赘述。
相应的， 本发明实施例还提出了一种核心网系统中呼叫异域终端的装置， 包括： 获取单元， 用于获取核心网系统中的 CS域终端注册状态信息和 IMS 域终端注册状态信息以及选网策略信息； 确定单元， 用于基于获取到的 CS域 终端注册状态信息和 IMS域终端注册状态信息， 确定被呼叫的异域终端的注 册状态信息； 选择单元， 用于基于获取到的选网策略信息以及确定的注册状 态信息， 从所述核心网系统中为所述异域终端选择一个核心网域提供所述呼 叫业务。
所述选择单元具体包括： 选择子单元， 用于在确定的注册状态信息为被 呼叫的异域终端只在 IMS域注册时， 选择所述 IMS域为所述异域终端提供呼 叫业务； 在确定的注册状态信息为被呼叫的异域终端只在 CS域注册时， 选择 所述 CS域为所述异域终端提供呼叫业务；以及在确定的注册状态信息为被呼 叫的异域终端在 IMS域和 CS域均注册时， 基于所述选网策略信息为所述异 域终端选择一个核心网域提供呼叫业务。
较佳地，当选择 CS域为异域终端提供呼叫业务时，所述选择单元还包括： 判断子单元， 用于判断所述呼叫业务是否为实时业务； 接续子单元， 用于在 判断结果为是时， 将所述呼叫业务通过所述 CS域的 MSC接续到所述异域终 端； 以及在判断结果为否时， 将所述呼叫业务通过所述 CS 域的 SMS MMS 接续到所述异域终端。
较佳地， 当选择 IMS域为异域终端提供呼叫业务时， 所述选择单元还包 括： 判断子单元， 用于判断所述呼叫业务是否为实时业务； 接续子单元， 用 于在判断结果为是时， 将所述呼叫业务通过所述 IMS域的 MGCF/MGW接续 到所述异域终端； 以及在判断结果为否时， 将所述呼叫业务通过所述 IMS域 的 IM/POC服务器接续到所述异域终端。
最后所应说明的是， 以上实施例仅用以说明本发明的技术方案而非限制， 尽管参照较佳实施例对本发明进行了详细说明， 本领域的普通技术人员应当 理解， 可以对本发明的技术方案进行修改或者等同替换， 而不脱离本发明技 术方案的精神和范围。

Claims

权 利 要 求
1、 一种支持异域终端选网的呼叫方法， 其特征在于， 包括：
获取核心网系统中的 CS域终端注册状态信息和 IMS域终端注册状态信 息以及选网策略信息；
基于获取到的 CS域终端注册状态信息和 IMS域终端注册状态信息， 确 定被呼叫的异域终端的注册状态信息；
基于获取到的选网策略信息以及确定的注册状态信息， 从所述核心网系 统中为所述异域终端选择一个核心网域提供所述呼叫业务。
2、 如权利要求 1所述的方法， 其特征在于， 所述基于获取到的选网策略 信息和确定的注册状态信息， 为异域终端选择一个核心网域提供呼叫业务包 括：
在确定的注册状态信息为被呼叫的异域终端只在 IMS域注册时， 选择所 述 IMS域为所述异域终端提供呼叫业务；
在确定的注册状态信息为被呼叫的异域终端只在 CS域注册时，选择所述 CS域为所述异域终端提供呼叫业务；
在确定的注册状态信息为被呼叫的异域终端在 IMS域和 CS域均注册时， 基于所述选网策略信息为所述异域终端选择一个核心网域提供呼叫业务。
3、 如权利要求 1或 2所述的方法， 其特征在于， 当选择 CS域为异域终 端提供呼叫业务时， 还包括：
判断所述呼叫业务是否为实时业务；
当判断结果为是时， 将所述呼叫业务通过所述 CS域的 MSC接续到所述 异域终端；
当判断结果为否时，将所述呼叫业务通过所述 CS域的 SMS/MMS接续到 所述异域终端。
4、 如权利要求 1或 2所述的方法， 其特征在于， 当选择 IMS域为异域终 端提供呼叫业务时， 还包括： 判断所述呼叫业务是否为实时业务；
当判断结果为是时， 将所述呼叫业务通过所述 IMS域的 MGCF/MGW接 续到所述异域终端；
当判断结果为否时， 将所述呼叫业务通过所述 IMS域的 IM/POC服务器 接续到所述异域终端。
5、 一种支持异域终端选网的装置， 其特征在于， 包括：
获取单元， 用于获取核心网系统中的 CS域终端注册状态信息和 IMS域 终端注册状态信息以及选网策略信息；
确定单元， 用于基于获取到的 CS域终端注册状态信息和 IMS域终端注 册状态信息， 确定被呼叫的异域终端的注册状态信息；
选择单元， 用于基于获取到的选网策略信息以及确定的注册状态信息， 从所述核心网系统中为所述异域终端选择一个核心网域提供所述呼叫业务。
6、 如权利要求 5所述的装置， 其特征在于， 所述选择单元具体包括： 选择子单元， 用于在确定的注册状态信息为被呼叫的异域终端只在 IMS 域注册时， 选择所述 IMS域为所述异域终端提供呼叫业务； 在确定的注册状 态信息为被呼叫的异域终端只在 CS域注册时， 选择所述 CS域为所述异域终 端提供呼叫业务； 以及在确定的注册状态信息为被呼叫的异域终端在 IMS域 和 CS域均注册时，基于所述选网策略信息为所述异域终端选择一个核心网域 提供呼叫业务。
7、 如权利要求 5或 6所述的装置， 其特征在于， 当选择 CS域为异域终 端提供呼叫业务时， 所述选择单元还包括：
判断子单元， 用于判断所述呼叫业务是否为实时业务；
接续子单元， 用于在判断结果为是时， 将所述呼叫业务通过所述 CS域的
MSC接续到所述异域终端； 以及在判断结果为否时， 将所述呼叫业务通过所 述 CS域的 SMS MMS接续到所述异域终端。
8、 如权利要求 5或 6所述的装置， 其特征在于， 当选择 IMS域为异域终 端提供呼叫业务时， 所述选择单元还包括： 判断子单元， 用于判断所述呼叫业务是否为实时业务；
接续子单元， 用于在判断结果为是时， 将所述呼叫业务通过所述 IMS域 的 MGCF/MGW接续到所述异域终端； 以及在判断结果为否时， 将所述呼叫 业务通过所述 IMS域的 IM/POC服务器接续到所述异域终端。
9、 一种核心网系统， 包括 CS域核心网、 IMS域核心网和异域终端， 其 特征在于，
所述 CS域核心网中的 HLR用于保存 CS域终端注册状态信息； 所述 IMS域核心网中的 HSS用于保存选网策略信息和 IMS域终端注册状 态信息；
所述 IMS域核心网中的选网设备分别与所述 HSS和 HLR交互， 用于获 取核心网系统中的 CS域终端注册状态信息和 IMS域终端注册状态信息以及 选网策略信息； 基于获取到的 CS域终端注册状态信息和 IMS域终端注册状 态信息， 确定被呼叫的异域终端的注册状态信息； 并基于获取到的选网策略 信息以及确定的注册状态信息， 从所述核心网系统中为所述异域终端选择一 个核心网域提供所述呼叫业务。
10、 如权利要求 9所述的核心网系统， 其特征在于， 所述 CS域核心网中 的 SCP分别与所述 HLR和 HSS交互，用于获取核心网系统中的 CS域终端注 册状态信息和 IMS域终端注册状态信息以及选网策略信息；基于获取到的 CS 域终端注册状态信息和 IMS域终端注册状态信息， 确定被呼叫的异域终端的 注册状态信息； 并基于获取到的选网策略信息以及确定的注册状态信息， 从 所述核心网系统中为所述异域终端选择一个核心网域提供所述呼叫业务。
11、 如权利要求 9所述的核心网系统， 其特征在于， 所述选网设备为所 述 IMS域中的 ENUM模块。
12、 如权利要求 9所述的核心网系统， 其特征在于， 所述选网设备为在 所述 IMS域中设置的选网应用服务器。
13、如权利要求 9-11中任一项所述的核心网系统，其特征在于，所述 HSS 和所迷 HLR合设； 则 所述分别与 HSS和 HLR交互具体为： 与合设的 HLR和 HSS通信连接。
14、如权利要求 9-11中任一项所述的核心网系统，其特征在于，所述 HSS 与所述 HLR通信连接， 且所述 HLR向所述 HSS更新 CS域终端注册状态信 息； 则
所述分别与 HSS和 HLR交互具体为： 与 HSS通信连接。
15、 一种核心网系统， 包括 CS域核心网、 IMS域核心网和异域终端， 其 特征在于，
所述 CS域核心网中的 HLR用于保存 CS域终端注册状态信息； 所述 IMS域核心网中的 HSS用于保存选网策略信息和 IMS域终端注册状 态信息；
所述 CS域核心网中的 SCP分别与所述 HSS和 HLR交互，用于获取核心 网系统中的 CS域终端注册状态信息和 IMS域终端注册状态信息以及选网策 略信息； 基于获取到的 CS域终端注册状态信息和 IMS域终端注册状态信息， 确定被呼叫的异域终端的注册状态信息； 并基于获取到的选网策略信息以及 确定的注册状态信息， 从所述核心网系统中为所述异域终端选择一个核心网 域提供所述呼叫业务。
PCT/CN2009/001261 2008-11-13 2009-11-13 支持异域终端选网的核心网系统、装置及呼叫方法 Ceased WO2010054536A1 (zh)

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