CN101043472A - Method, equipment and system for routing the call in circuit domain network to packet domain network - Google Patents

Abstract

The invention discloses a method for routing a call in a circuit domain network to a packet domain network. In this method, by modifying the initial call trigger service signed by the terminal, the MSC can obtain routing information from the network element equipment in the circuit domain network according to the initial call trigger service information of the terminal, and then construct and send an outgoing call according to the routing information, so that the MSC can The MSC implements the routing of calls in the circuit domain network to the packet domain network without having the processing capability of the intelligent network. At the same time, the invention also discloses a device and system for routing calls in the circuit domain network to the packet domain network.

Description

Method, device and system for routing calls in circuit domain network to packet domain network

technical field

The invention relates to a communication network, in particular to a call transfer technology from a circuit domain network to a packet domain network in the communication network.

Background technique

At present, the communication network is divided into two networks, the circuit domain and the packet domain. The circuit domain network is a traditional network based on circuit switching, while the packet domain network is a new type of network based on advanced packet switching technology. At the current stage where dual networks coexist, operators sometimes have the need to transfer calls occurring in the CS domain network to the PS domain network for control. For those dual-mode terminals that support both circuit domain network access and packet domain network access, a packet domain network-based entity (such as a NeDS network domain selection entity) is always inserted in the call path of the dual-mode terminal , so as to control the service of the dual-mode terminal, for example, the handover process initiated by the dual-mode terminal from the circuit domain network to the packet domain network in the call state. For those traditional circuit domain network terminals, operators may also need to use the packet domain network to manage the calls of these terminals in a unified manner for the sake of saving costs. Therefore, it is necessary to transfer their calls on the circuit domain network to the packet domain network.

In the 3GPP2 standard organization, some manufacturers proposed a scheme based on the intelligent network to route calls in the CS domain network to the PS domain network. Referring to FIG. 1 , the data flow of the scheme is illustrated. As shown, the scenario includes steps:

1. MS1 (mobile terminal 1) initiates an initial call on the circuit domain network, the call number (namely Cld Number) is the number of MS2, that is, the called terminal is MS2, and the initial call is sent to MSC/VLR (Mobile Switching Center/Visitor location register);

2. MSC/VLR triggers the initial call to the control entity NeDS of the packet domain network by means of smart contract triggering. This step is a routing request step, which can be realized by an ORREQ message;

3. NeDS records the original called number of MS1, that is, the number of MS2, and then modifies the calling number to the IMS domain access number (ie IMS Rtg Number), and returns it to MSC. This step is the routing request response step, and can also be passed through ORREQ message implementation;

4. The MSC routes the call to the MGCF (media gateway control entity) according to the IMS domain access number. The call is an outbound call, which can be implemented through the IAM signaling in the ISUP signaling group;

5. The MGCF triggers the outgoing call to NeDS in the form of a SIP (Session Initiation Protocol) call through the I/S-CSCF (query/service call session control function);

Subsequent NeDS restores the calling number to the saved original called number (that is, the number of MS2), performs service control, and then continues the call connection.

In the above technical solution, the MSC is triggered to NeDS by means of intelligent triggering, which requires the MSC to have intelligent network processing capabilities, thus resulting in high equipment upgrade and maintenance costs for operators.

Contents of the invention

The purpose of the present invention is to allow the MSC to distinguish the call initiated by the dual-mode terminal on the circuit domain network without introducing an intelligent network, and to route it to the packet domain network, which is controlled by the packet domain network, to solve the problem. In the prior art, the MSC must be upgraded to have intelligent network processing capability, which causes the technical problem of high equipment upgrade and maintenance costs.

One aspect of the present invention provides a method for routing a call in a circuit domain network to a packet domain network. A user subscribes to a call origination trigger service. The method includes: the user initiates a call in the circuit domain network, and the call The called number is the number of the called user; the call is received at the mobile switching center in the circuit domain network; and the call is generated in the mobile switching center according to the routing information obtained through interaction with the user's home location register an outgoing call, the outgoing call carries the called user number; and the outgoing call is sent in the mobile switching center; and the outgoing call is received in the packet domain network.

Another aspect of the present invention provides a device for routing a call in a circuit domain network to a packet domain network. A user initiates a call in the circuit domain network, and the called number in the call is the called user number. The device Including: a receiving unit, used to receive the call; an obtaining unit coupled to the receiving unit, used to obtain routing information; a generating unit coupled to the obtaining unit, used to generate an outgoing call according to the routing information , the outgoing call carries the called user number; the sending unit coupled with the generating unit is configured to send the outgoing call. Another aspect of the present invention provides a system for routing calls from a circuit domain network to a packet domain network, including a terminal for initiating a call, and the called number in the call is the called user number; the terminal and the home The mobile switching center coupled with the location register, the mobile switching center includes: a receiving unit, used to receive the call; an acquiring unit coupled with the receiving unit, used to acquire routing information; coupled with the acquiring unit A generating unit, configured to generate an outgoing call according to the routing information, the outgoing call carrying the called user number; a sending unit coupled to the generating unit, configured to send the outgoing call, and exchange with the mobile The packet domain network equipment coupled to the center is used to receive the outgoing call.

The present invention provides such a method, device and system. By identifying the originating call trigger service information of the user terminal on the mobile switching center, the subscription service is triggered. The subscription service can be some improvement of the existing service or a newly established service. business. Through the subscription service, the routing information is obtained in the home location register in the circuit domain network or other network element equipment, and the call initiated by the terminal in the circuit domain network can be routed to the packet domain network through the routing information . In this way, call routing and switching are realized without upgrading the mobile switching center to adapt to the intelligent network. The transformation cost of the manufacturer is low.

Description of drawings

FIG. 1 is a data flow diagram of a method for routing a call in a circuit domain network to a packet domain network in the prior art;

FIG. 2 is a structural diagram of a specific embodiment of a system for routing a call in a circuit domain network to a packet domain network provided by the present invention;

Fig. 3 is a functional structure diagram of MSC105 in Fig. 2;

FIG. 4 is a data flow diagram of an embodiment of a method for routing a call in a CS domain network to a PS domain network based on the system in FIG. 2;

Fig. 5a is a data flow diagram during terminal registration of another embodiment of the method for routing a call in a circuit domain network to a packet domain network based on the system in Fig. 2;

Fig. 5b is a data flow diagram during call transfer of another embodiment of the method for routing a call in a CS domain network to a PS domain network based on the system in Fig. 2 .

FIG. 6 is a structural diagram of another specific embodiment of a system for routing a call in a circuit domain network to a packet domain network provided by the present invention;

FIG. 7 is a data flow diagram of an embodiment of a method for routing a call in a CS domain network to a PS domain network based on the system in FIG. 6 .

Detailed ways

Referring to FIG. 2 , it illustrates an embodiment of the system structure for routing a call in a CS domain network to a PS domain network provided by the present invention. As shown in the figure, MS50 is the user's mobile terminal equipment, which may be a dual-mode terminal (supporting both the circuit domain network and the packet domain network). The communication network serving the MS 50 includes a PLMN (Public Land Mobile Network) 100 and an IMS (IP Multimedia Subsystem) network 200 . The PLMN 100 is a circuit domain network, and the IMS network 200 is a packet domain network. Wherein, the PLMN100 includes an MSC105 and an HLR (Home Location Register)110. Of course, the PLMN100 also includes BSC (base station controller) and other network element entities responsible for connecting the signal of MS50 to the network and other network element entities (such as VLR, visitor location register), but these technologies belong to those skilled in the art Well-known techniques, and have little to do with the implementation of the present invention, are therefore omitted. The MS50 can communicate with the MSC105, and the MSC105 can communicate with the HLR110.

It is worth noting that in this article, "user" and "terminal" or "user terminal" have the same meaning unless otherwise specified.

Referring to FIG. 2 , the IMS network 200 includes MGCF205 , I/S-CSCF210 and NeDS215 . Wherein, the MGCF205 can communicate with the MSC105. The I/S-CSCF210 can communicate with the MGCF205 and NeDS215.

Referring to FIG. 3 , a functional structure diagram of the MSC 105 in FIG. 2 is illustrated. As shown in the figure, the MSC 105 includes a receiving unit 106 , an acquiring unit 107 coupled to the receiving unit 106 , a generating unit 108 coupled to the acquiring unit 107 , and a sending unit 109 coupled to the generating unit 108 . The MSC 105 also includes a storage unit 104 coupled to the acquisition unit 107 .

If the MS 50 has subscribed to some origination trigger services in the circuit domain network, the purpose of the present invention can be realized by modifying these services.

In a circuit domain network (for example, PLMN100 in FIG. 2 ), there is a supplementary origination trigger service called "SPINI (subscriber PIN code interception)" service. Taking the example environment in Figure 2 as an example, when MS50 subscribes to this service, if the call number initiated by MS50 meets the triggering conditions for signing (such as international long distance, domestic long distance, all calls, etc.), MSC105 will trigger the call to HLR110. The HLR110 plays the sound to the MS50 and requires the MS50 to input the PIN code. If MS50 has input the correct PIN code, then HLR110 returns the indication of call continuation, continues to connect call by MSC105. In a specific embodiment of the present invention, MSC105 obtains routing information by modifying this service.

Referring to FIG. 4 , it illustrates the data flow of an embodiment of the method for routing a call in the CS domain network to the PS domain network based on the implementation environment of FIG. 2 . In this embodiment, MS50 subscribes to the SPINI service, and the trigger condition is "all calls". Referring to FIG. 4 while referring to FIG. 3 and FIG. 2, as shown in the figure, the method includes:

1. MS50 initiates a call in PLMN100, and the call number (that is, the Cld Number in the figure) is the number of MS2, that is, MS2 is the terminal of the called user;

2. MSC105 receives the call through receiving unit 106, that is, MS50 initiates a calling service, and recognizes that MS50 has signed up for the SPINI service according to the service information triggered by MS50, and sends a routing information request to HLR110 according to the requirements of this service , that is, the step of obtaining routing information, which is controlled by the MSC 105 through the obtaining unit 107 . MSC 105 may send the routing information request through an ORREQ message of the MAP signaling group. 3. After the HLR110 receives the routing information request and judges that the MS50 is a dual-mode terminal, it does not need to require the MS50 to input a PIN code as processing normal SPINI services, but generates the routing information and sends the routing information as The form of routing information request response is sent to MSC105. In the routing information, the calling number is changed to the routing number of the IMS network 200, and the original calling number (ie, the number of MS2) may be carried in the routing information. The manner of carrying may be indicated by a special parameter, or the routing number of the IMS network 200 may be added before the original calling number as the calling number. This step is the routing information request response step, which can be sent by the HLR 110 through the ORREQ message of the MAP signaling group.

4. After receiving the routing information, the MSC 105 generates an outgoing call, and the calling number of the outgoing call is the calling number in the routing information, that is, the routing number of the IMS network 200 . And the original calling number (that is, the number of MS2), that is, the number of the called party, is also carried in the outgoing call. This work is performed by the generation unit 108 in the MSC 105 . After the outgoing call is generated, the sending unit 109 of the MSC 105 sends the outgoing call, which may be implemented through IAM signaling in the ISUP signaling group. The outgoing call will be routed to the MGCF 205 in the IMS network 200 according to the calling number;

5. After the MGCF205 receives the outgoing call, it triggers the outgoing call to NeDS215 through the I/S-CSCF210, which can be sent by constructing SIP signaling, and the request URI field in the SIP signaling is filled with the one received from the MSC205 The routing number of the IMS network 200, and the original called party number (the number of MS2) is filled in another special header field. NeDS215 performs follow-up processing after receiving the outgoing call.

So far, the call of MS 50 in PLMN 100 has been routed to IMS network 200 . In this embodiment, the MSC105 does not need to support the intelligent network, and it only needs to improve on the basis of the original service (that is, the SPINI service), so as to distinguish the user attributes of the MS50 and route the calls of a specific terminal in the circuit domain network to The purpose of receiving the packet domain network to which the specific terminal belongs.

It is worth noting that if MS50 originally subscribed to a certain number to trigger the SPINI service, such as "international call trigger", then in order not to affect the original contracted service of MS50, HLR110 should detect after processing the "all calls" trigger. Whether the service that MS50 is currently preparing to carry out meets another contract trigger condition, and if so, it still needs to trigger the original PIN code interception service, and requires MS50 to input the PIN code to play the announcement to MS50. Because it was originally judged by MSC105 whether the service performed by MS50 satisfies the trigger condition, but now it is judged by HLR110, so HLR110 must consider the roaming of MS50, that is, whether MS50 is performing this service in a roaming place to judge Whether the attribute of the service currently performed by MS50 satisfies the service triggering condition.

It is worth noting that the acquisition of routing information can also be achieved in the following manner: when MS50 signs up for SPINI service registration, the routing information is generated by HLR110 and sent to MSC105, stored in the storage unit 104 of MSC105, when MS50 initiates a call , the MSC105 does not need to go to the HLR110 to obtain it, but directly obtains it from the storage unit 104 through the internal interface. In this way, the interaction between MSC105 and HLR110 is saved during calling, thus shortening the connection time. In another specific embodiment below, this way of obtaining routing information is introduced in more detail.

In a circuit domain network (such as PLMN100 in FIG. 2 ), there is also a supplementary origination trigger service called "single number call out" service. Taking the example environment in Figure 2 as an example, after MS50 subscribes to this service, any call initiated by MS50 will be connected to a fixed number agreed in advance, which we can call "restricted number". In another specific embodiment of the present invention, the MSC105 obtains routing information by modifying this service.

Referring to FIG. 5 a , it illustrates a data flow during terminal registration of another embodiment of the method for routing a call in the CS domain network to the PS domain network based on the implementation environment of FIG. 2 . In this embodiment, MS50 subscribes to the single number outbound service, as shown in the figure, the signing and registration process includes:

1. MS50 initiates a registration request, requesting to sign a single number outbound service, and the registration request is sent to MSC105, which can be sent as a Location Update Request message;

2. MSC105 sends a registration notice to HLR110 after receiving said registration request, submits said registration request to HLR110, and can send REGNOT message in MAP signaling group;

3. After receiving the registration notification, HLR110 generates routing information and returns it to MSC105 in the form of subscription data. The routing information is the single-number outgoing service information, in which the restricted number is filled in as the routing number of the IMS network 200, which can be sent as a REGNOT message in the MAP signaling group;

4. After MSC105 receives the routing information, store it in the storage unit 104 for future use, and simultaneously send a registration success message to MS50, which can be sent in the form of a Location Update Request message.

Referring to FIG. 5 b , it illustrates the data flow when the call is transferred in another embodiment of the method for routing a call in the CS domain network to the PS domain network based on the implementation environment of FIG. 2 . Referring to Fig. 2 and Fig. 3 simultaneously, the method includes:

1. MS50 initiates a call in PLMN100, and the call number (that is, the Cld Number in the figure) is the number of MS2 (such as the MDN number), that is, MS2 is the called user terminal;

2. The MSC105 receives the call through the receiving unit 106, and according to the originating call trigger service information of the MS50, the obtaining unit 107 of the MSC105 obtains the routing information from the storage unit 104 through the internal interface. The routing information is the routing information downloaded by the MSC 105 on the HLR 110 and stored in the storage unit 104 when the MS 50 registers the single number outbound service. Then generating unit 108 generates an outgoing call according to the routing information. In this outgoing call, the calling number is filled in as a restricted number in the routing information, that is, the routing number of the IMS network 200, and the original calling number (the number of MS2) is filled in In the original call number parameter, the outgoing call is sent by the sending unit 109, which can be realized by IAM signaling in the ISUP signaling group. The outgoing call will be routed to the MGCF 205 in the IMS network 200 according to the calling number;

3. After receiving the outgoing call, the MGCF205 triggers the outgoing call to the NeDS215 through the I/S-CSCF210, which can be sent by constructing SIP signaling, and the request URI field in the SIP signaling is filled with the one received from the MSC205 The routing number of the IMS network 200, and the original called number (the number of MS2) is filled in another special header field. NeDS215 performs follow-up processing after receiving the outgoing call.

So far, the call of MS 50 in PLMN 100 has been routed to IMS network 200 . In this embodiment, MSC105 is not required to support the intelligent network, and it only needs to be improved on the basis of the original service (that is, the single-number call service), so as to distinguish the user attributes of MS50 and place a specific terminal in the circuit domain network. The purpose of routing the call to the packet domain network to which the specific terminal belongs.

Referring to FIG. 6 , it illustrates another embodiment of the system structure for routing a call in the CS domain network to the PS domain network provided by the present invention. Referring to FIG. 2 at the same time, compared with FIG. 2, this embodiment adds a signaling interception device 108 between MSC105 and HLR110 on the basis of FIG.

Referring to FIG. 7 , a data flow of an embodiment of a method for routing a call in a CS domain network to a PS domain network based on the system in FIG. 6 is illustrated. Referring to FIG. 4 at the same time, as shown in the figure, compared with FIG. 4 , the signaling interception device 108 replaces the HLR 100 to respond to the routing request information. That is to say, when the MSC105 sends routing request information to the HLR100, the signaling interception device 108 intercepts the routing request information, and responds by sending the routing information to the MSC105 in the form of routing request response information. The routing information on the signaling interception device 108 may be obtained from the HLR100. Other steps in this embodiment are the same as those in FIG. 4 , and will not be repeated here.

The purpose of the present invention can also be realized by adding some originating trigger services. In yet another specific embodiment of the present invention, by defining a new origination trigger service, the origination trigger service is triggered when MS50 initiates a call. The main function of this service is that MSC105 can use this service to obtain the route of IMS network 200 information, and then route the call of MS50 in PLMN100 to IMS network 200 according to the routing information. The flow of this embodiment is similar to the flow of the above embodiment, and will not be repeated here.

What is disclosed above is only a preferred embodiment of the present invention, and of course it cannot limit the scope of rights of the present invention. Therefore, equivalent changes made according to the patent scope of the present invention still fall within the scope of the present invention.

Claims (16)

1. A method for routing a call in a circuit domain network to a packet domain network, the user signs a call origination trigger service, it is characterized in that the method includes: The user initiates a call in the circuit domain network, and the called number in the call is the called user number; receiving the call at a mobile switching center in the circuit domain network; generating an outgoing call in the mobile switching center according to routing information obtained through interaction with the user's home location register, the outgoing call carrying the number of the called user; and sending said outgoing call in said mobile switching center; The outgoing call is received in the packet domain network. 2. The method according to claim 1, characterized in that: the interaction is that the mobile switching center interacts with the home location register when the user performs a calling service, and obtaining routing information includes the steps of: sending a routing information request to the home location register in the mobile switching center; The routing information is received in the mobile switching center from a returned message. 3. The method according to claim 1, characterized in that: the interaction is that the mobile switching center interacts with the home location register when the user registers, and is stored in the mobile switching center after acquisition , when the user performs a calling service, the mobile switching center obtains the routing information stored in the mobile switching center through an internal interface. 4. The method according to claims 2 and 3, characterized in that: the routing information is stored in the HLR, and returns when receiving a routing information request or a registration request sent from the mobile switching center The routing information includes the routing number of the packet domain. 5. The method according to claims 2 and 3, characterized in that: the routing information is stored in a signaling interception device, and the mobile switching center sends a request to obtain routing information or a registration request to the HLR When sending a message, implement signaling interception in the signaling path, intercept the message and return the routing information to the mobile switching center, and the routing information includes the routing number of the packet domain. 6. The method according to claim 1, characterized in that: the origination trigger service is a user PIN code interception service, or a single number outbound service, or a newly added origination trigger service. 7. The method according to any one of claims 4, characterized in that: the called number in the outgoing call is the routing number of the packet domain. 8. The method according to claim 7, characterized in that: the called party number is indicated by a special parameter in the outgoing call or the routing number of the packet field is added before the called party number. 9. The method according to claim 1, characterized in that: the electrical domain network is a public land mobile communication network, and the packet domain network is an IP multimedia subsystem network. 10. The method according to claim 1, wherein the packet domain network includes a media gateway control entity, a call session control function, and a network domain selection entity, and the outgoing call passes through the media gateway control entity, The call session control function reaches the network domain selection entity. 11. A device for routing a call in a circuit domain network to a packet domain network, where a user initiates a call in the circuit domain network, and the called number in the call is the called user number, characterized in that the device includes : a receiving unit for receiving the call; An acquisition unit coupled to the receiving unit, configured to acquire routing information; A generating unit coupled to the obtaining unit, configured to generate an outgoing call according to the routing information, and the outgoing call carries the called user number; A sending unit coupled with the generating unit, configured to send the outgoing call. 12. The device according to claim 9, further comprising a storage unit coupled to the obtaining unit for storing the routing information. 13. A system for routing calls in a circuit domain network to a packet domain network, comprising: The terminal is used to initiate a call, and the called number in the call is the called user number; A mobile switching center coupled to said terminal and a home location register, the mobile switching center comprising: a receiving unit for receiving the call; An acquisition unit coupled to the receiving unit, configured to acquire routing information; A generating unit coupled to the obtaining unit, configured to generate an outgoing call according to the routing information, and the outgoing call carries the called user number; a sending unit coupled to the generating unit, configured to send the outgoing call, The packet domain network equipment coupled to the mobile switching center is used to receive the outgoing call. 14. The system according to claim 13, further comprising a home location register storing pre-configured routing information; 15. The system according to claim 13, further comprising a signaling interception device storing pre-configured routing information; 16. The system according to claim 13, further comprising a storage unit coupled to the obtaining unit for storing the routing information.

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