WO2010054536A1

WO2010054536A1 - Core network system, device and calling method for supporting foreign domain terminal selecting network

Info

Publication number: WO2010054536A1
Application number: PCT/CN2009/001261
Authority: WO
Inventors: 魏强; 于青
Original assignee: 中国移动通信集团公司
Priority date: 2008-11-13
Filing date: 2009-11-13
Publication date: 2010-05-20

Abstract

A core network system, device and calling method for supporting a foreign domain terminal selecting a network are disclosed. The method includes the following steps. Terminal registration status information in a CS domain and terminal registration status information in an IMS domain of a core network system and network selection policy information are acquired. According to the acquired terminal registration status information in the CS domain and terminal registration status information in the IMS domain, the registration status information about a called foreign domain terminal is determined. According to the acquired network selection policy information and the determined registration status information, a core network domain is selected for the foreign domain terminal from the core network system to supply the calling service. A core network domain can be selected accurately and instantly for called foreign domain terminals through solutions in the present invention. The experience of users can be improved. Meanwhile the requirement for performance of the system doesn’t need to be increased.

Description

Core network system, device and calling method for supporting foreign terminal selection network

Technical field

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. Provide new data services, such as Multimedia Messaging Service (MMS), content browsing, etc., but these IP-based data services are due to network bandwidth limitations, terminal restrictions, poor user experience, and unclear billing. There are no successful applications.

In order to overcome the above problems, the 3rd Generation Partnership Project (3GPP, 3rd Generation Partnership Project) proposed the IP Multimedia Subsystem (IMS) in the Release 5 version. The IMS is superimposed on the PS domain and applied to the PS domain. Carrying and transmitting multimedia signals. IMS establishes a softswitch platform for controlling calls/sessions, realizing real-time and end-to-end communication services through technologies such as session negotiation and management, QoS management, and mobility management. 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.

In the prior art, 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. When the terminal in the CS domain makes a call to the terminal in the IMS domain, 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. (MGW, Media Gateway) unit, further in the IMS domain, the service-call session control function (S-CSCF, Service-Call Session Control Function) module, the electronic number mapping from the terminal number to the universal positioning connection (URL) The (Enum, Electronic Numbering) module and the Home Subscriber Server (HSS) process; when the terminal in the IMS domain makes a call to the terminal in the CS domain, the HSS recognizes and instructs the S-CSCF module to place the call. Transfer to the MGCF unit, further implementing call processing in the CS domain by the MSC. For the case where the IMS domain terminal and the CS domain terminal are independent of each other, the existing core network system can meet the requirements of accurate calling.

However, with the continuous advancement of the terminal technology, 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). Although 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.

In order to cope with the above problem that the core network domain cannot be selected, 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. However, since the foreign terminal is not necessarily registered in different core domains at the same time, 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. However, 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:

Obtaining CS domain terminal registration status information and IMS domain terminal registration status information and network selection policy information in the core network system;

Determining registration status information of the called foreign terminal based on the acquired CS domain terminal registration status information and the IMS domain terminal registration status information;

And selecting, according to the obtained network selection policy information and the determined registration status information, a core network domain from the core network system to select the core network domain to provide the call service.

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;

And 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 proposed by the embodiment of the present invention 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

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;

3 is a block diagram of a core network system according to Embodiment 2 of the present invention;

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; a block diagram of the core network system proposed in Example 6;

8 is a block diagram of a core network system according to Embodiment 7 of the present invention;

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 according to the embodiment of the present invention 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.

Preferably, 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.

Preferably, when the CS domain is selected to provide the call service to the remote terminal, 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.

Preferably, when the IMS domain is selected to provide the call service to the foreign terminal, 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.

Specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

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. In the case of the same E.164 number, 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.

For example, when the foreign terminal C uses the 2nd generation SIM+ISIM composite card, 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) and real-time IMS services (such as multimedia sessions); when 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).

In the core network system proposed in this embodiment, the IMS domain B includes the S-CSCF module B 1 and the HSS B2. ENUM module B3, and MGCF/MGW unit B4. CS domain A includes MSC Al, HLR A2, and SMS (Short Message Service) / Multimedia Message Service (MMS) Center A3.

In the prior art, 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.

In the core network system provided in this embodiment, 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.

For example, when ENUM B3 recognizes that the foreign terminal C is registered in the IMS domain B and the CS domain A, and the network selection policy obtained from the HSS B2 is the CS domain selection mode, the analysis failure instruction is returned to the S-CSCF, then the S -CSCF automatically routes the call to MGCF/MGW.

In the embodiment of the present invention, 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.

It should be noted that 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. Of course, the network selection policy information and the terminal registration status information are selected. It can also be stored in other entities.

In addition, in this embodiment, 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. For example, other entities may be selected as the network selection device. In this embodiment, ENUM B3 interacts with HLR A2 and HSS B2, respectively, specifically ENUM B3 is communicatively coupled to HLR A2 and HSS B2, respectively. Specifically, the ENUM B3 of the IMS domain B is communicably connected to the HLR A2 through the MAP interface.

In the embodiment of the present invention, 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. Thus, the problem of the MSC forwarding SMS/MMS can be avoided, and the efficiency is further improved.

Embodiment 2:

Referring to FIG. 3, 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.

Since HLRA2 and HSS B2 are combined, the internal interface connection is a trend of convergence of mobile communication networks. Therefore, the solution provided by this embodiment is more suitable for the fused mobile communication system.

Embodiment 3:

Referring to FIG. 4, 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.

It should be noted that when the foreign terminal C is used as the calling party, since the network can be actively selected, the core network system of the prior art can continue to meet the requirements. However, when the remote terminal C is used as the called party, 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.

It can be seen that 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. At the same time, the state transition of the remote terminal is avoided, and the system performance requirement is reduced.

Based on the above-mentioned core network system supporting the network selection of the foreign terminal, 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.

Embodiment 4

In this embodiment, 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. Referring to FIG. 5, 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. Embodiment 5

To further improve efficiency, when MGCF/MGW adds the identification function of the service, see Figure 6, including:

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.

Another core network system proposed by the embodiment of the present invention will be described below with reference to the accompanying drawings.

Example 6:

Figure Ί 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.

In the core network system proposed in this embodiment, 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.

In this embodiment, 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.

It should be noted that, in the first embodiment, 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. In the embodiment, a network selection application server is specifically configured in the IMS domain to perform the function of the network selection device.

For example, when 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. In the case of the domain, the voice call initiated by the IMS domain B is routed to the CS domain A through the MGCF/MGW B5 for processing.

In this embodiment, 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.

For example, when SCP A3 recognizes that the foreign terminal C is registered in both the IMS domain B and the CS domain A, and according to the network selection policy obtained from the HSS B2 (for example, the MMS call is the IMS domain selection mode (ie, the IMS domain is selected)) When the IMS domain needs to be 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.

In this embodiment, 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.

In this embodiment, 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.

Example 7:

Referring to Figure 8, 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.

Since the HLR and the HSS are combined, the connection through the internal interface is a development trend of the convergence of the mobile communication network. Therefore, the solution provided by this embodiment is more suitable for the mobile communication system after the convergence.

Example 8:

Referring to FIG. 9, 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.

In the above embodiment, the SCP A3 interacts with the HSS B2 or the whole device D through the MAP interface, and 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.

In the embodiment of the present invention, 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. .

These policies can be saved not only in the HSS B2 but also in the network application server B3. This prevents the network application server B3 from obtaining the interaction of the network selection policy from the HSS B2.

In the above embodiment of the present invention, 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. For example, if a special IMS domain number or a special CS domain number is set as a prefix plus a normal E.164 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. Of course, 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.

It can be seen that 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.

Based on the above-mentioned core network system supporting the hetero-terminal selection network, 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.

Example nine

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:

In one case, when the call service in step 1 is a voice call, the SCP receives the call request sent by the MSC. For example, the terminal in the CS domain initiates a voice call, and 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.

However, when the called party initiates a visual voice call, 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.

In another case, when the call service in the step 1 is a message type service, 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.

Example ten

Referring to FIG. 6, 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.

In the call service initiated by the IMS domain, real-time services (such as voice services) and non-real-time services (such as message services) are also handled by different gateways. Therefore, the call service is voiced. In the case of a class service, 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.

When the call service is a message service, 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.

When the user accesses the IMS domain, it has the normal service function of the normal IMS domain terminal. When the user accesses the CS domain, it has the normal service function of the ordinary CS domain terminal. Therefore, if the foreign terminal is only registered in one domain. , the communication mode is a conventional intra-domain or inter-domain communication, and details are not described herein again.

Correspondingly, 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.

Preferably, 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.

Preferably, 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.

It should be noted that the above embodiments are only intended to illustrate the technical solutions of the present invention and are not intended to be limiting, and the present invention will be described in detail with reference to the preferred embodiments. Modifications or equivalents are made without departing from the spirit and scope of the invention.

Claims

Rights request

A call method for supporting a remote terminal selection network, which is characterized in that:

The method according to claim 1, wherein the 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, the IMS domain is selected to provide the 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;

When the determined registration status information is that the called foreign terminal is registered in both the IMS domain and the CS domain, selecting a core domain to provide a call service for the foreign terminal based on the network selection policy information.

The method according to claim 1 or 2, wherein when the CS domain is selected to provide a call service for the heterogeneous terminal, the method further includes:

Determining whether the call service is a real-time service;

When the judgment result is yes, the call service is connected to the foreign terminal through the MSC of the CS domain;

When the judgment result is no, the call service is connected to the foreign terminal through the SMS/MMS of the CS domain.

The method according to claim 1 or 2, wherein when the IMS domain is selected to provide a call service for the remote terminal, the method further includes: Determining whether the call service is a real-time service;

When the judgment result is yes, the call service is connected to the foreign terminal through the MGCF/MGW of the IMS domain;

When the judgment result is no, the call service is connected to the foreign terminal through the IM/POC server of the IMS domain.

5. A device for supporting a network selection of a foreign terminal, comprising:

The device according to claim 5, wherein 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, The IMS domain provides 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; and the determined registration status is When the information is that the called foreign terminal is registered in both the IMS domain and the CS domain, the network service is configured to select a core domain to provide a call service according to the network selection policy information.

The device according to claim 5 or 6, wherein when the CS domain is selected to provide a call service to the heterogeneous terminal, the selecting unit further includes:

a determining subunit, configured to determine whether the call service is a real-time service;

a connection subunit, configured to pass the call service through the CS domain when the determination result is yes

The MSC is connected to the foreign terminal; and when the determination result is no, the call service is connected to the foreign terminal through the SMS MMS of the CS domain.

The device according to claim 5 or 6, wherein when the IMS domain is selected to provide a call service to the remote terminal, the selecting unit further includes: a determining subunit, configured to determine whether the call service is a real-time service;

a connection subunit, configured to: when the determination result is yes, connect the call service to the remote terminal by using the MGCF/MGW of the IMS domain; and when the determination result is no, the call service is used by the The IM/POC server of the IMS domain is connected to the foreign terminal.

9. A core network system, including a CS domain core network, an IMS domain core network, and an alien terminal, wherein

The network selection device in the IMS domain core network 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; 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 The foreign terminal selects a core network domain to provide the call service.

The core network system according to claim 9, wherein the SCP in the core network of the CS domain interacts with the HLR and the HSS, and is used to obtain the registration status information of the CS domain terminal in the core network system. IMS domain terminal registration status information and network selection policy information; determining registration state information of the called foreign terminal based on the acquired CS domain terminal registration status information and IMS domain terminal registration status information; and based on the acquired network selection policy information And determining the registration status information, and selecting, by the core network system, a core network domain for the foreign terminal to provide the call service.

The core network system according to claim 9, wherein the network selection device is an ENUM module in the IMS domain.

The core network system according to claim 9, wherein the network selection device is a network selection application server set in the IMS domain.

The core network system according to any one of claims 9 to 11, wherein the HSS and the HLR are combined; The interaction with the HSS and the HLR respectively is specifically: communicating with the combined HLR and HSS.

The core network system according to any one of claims 9-11, wherein the HSS is in communication with the HLR, and the HLR updates the CS domain terminal registration status information to the HSS;

The interaction with the HSS and the HLR respectively is specifically: communicating with the HSS.

15. A core network system, including a CS domain core network, an IMS domain core network, and an alien terminal, wherein