CN101841788A - Method, device and system for forwarding call - Google Patents

Abstract

The present invention discloses a method, device and system for forwarding a call, wherein the method for forwarding a call includes: the first mobile switching center MSC where the called user is located in the first network sends the call to the network element in the second network Sending a redirection request; the network element sends the redirection number of the called user to the second MSC where the calling user is located according to the redirection request; the second MSC forwards the call according to the received redirection number. The present invention solves the problem that the forwarding call process in the prior art cannot perform correct forwarding calls in the scene of hybrid networking, and realizes correct forwarding calls in the scene of hybrid networking.

Description

Method, device and system for forwarding calls

technical field

The present invention relates to the communication field, in particular to a method, device and system for forwarding a call.

Background technique

As shown in Figure 1, in the traditional Code Division Multiple Access (CDMA for short) 2000 communication system, intelligent services comply with the Wireless Intelligent Network (WIN for short) protocol, and users Sign various smart service triggers in the home location register (Home Location Register, referred to as "HLR"). When the user initiates or receives a call, each trigger point in the call connection process is completed to the service location point according to the signed trigger. The service control point (Service Control Point, referred to as "SCP") is triggered by the SCP to complete the specific business logic control, and instruct the Mobile Switching Center (Mobile Switching Center, referred to as "MSC") how to proceed to the next step.

As shown in Figure 2, the forwarding call process in the existing CDMA2000 communication system includes the following steps:

Step S201: the calling user initiates a call;

Step S202: the MSC where the calling user is located (called the originating MSC) recognizes that the called is a mobile user, and requests the called related service information to the HLR to which the called user belongs;

Step S203: the HLR sends a routing request message to the landed MSC to which the user belongs (or called: the MSC where the called party is located);

Step S204: The landing MSC returns a routing request message, carrying a temporary roaming number TLDN;

Step S205: The HLR returns the called location information, carrying the TLDN number assigned by the landed MSC;

Step S206: The originating MSC connects the call to the landed MSC according to the TLDN number, and then connects to the called user, and the called user rings;

Step S207: the called user does not answer for a long time, and after the ringing timeout, the landing MSC sends a redirection request message to the originating MSC;

Step S208: the originating MSC requests the redirection number of the original called user from the HLR;

Step S209: the HLR sends a response message carrying a redirection number to the originating MSC;

Step S210: The originating MSC performs reconnection according to the above-mentioned redirection number.

It can be seen from the above process that the user's forwarding process is recorded by the HLR at the user's redirection number and controlled to forward.

FIG. 3 shows a schematic diagram of a mixed networking of an IP Multimedia Subsystem (IP Multimedia Subsystem, referred to as "IMS") network and a CDMA network. In this hybrid networking scenario, network elements of the IMS network are used to implement services of various CDMA network (hereinafter referred to as C network) users. The service list information of these users is recorded in the IMS domain. These users can subscribe to multiple services at the same time, and can realize the nesting of multiple services. In this article, such users are called multi-service users.

In this mixed networking scenario, the redirection number of the called user is not stored in the HLR, so that the calling user cannot obtain the redirection number of the called user according to the existing process. Since the called user is in the C network, the call will be connected to the C network eventually. If the called user has not activated the forwarding service on the HLR, the calling user will It will mistakenly think that the connection has failed and hang up in advance.

It can be known from the above that the call forwarding process in the existing CDMA network cannot be applied in the hybrid networking scenario, that is, the correct forwarding call cannot be performed in the hybrid networking scenario.

Contents of the invention

The main purpose of the present invention is to provide a method, device and system for forwarding calls, so as to at least solve the problem that the forwarding call process in the prior art cannot perform correct forwarding calls in a hybrid networking scenario.

According to one aspect of the present invention, a method for forwarding a call is provided, which includes: the first mobile switching center MSC where the called user in the first network is located sends a redirection request to a network element in the second network; The network element sends the redirection number of the called user to the second MSC where the calling user is located according to the redirection request; the second MSC forwards the call according to the received redirection number.

Further, the above-mentioned first MSC sending the redirection request to the network element in the second network includes: the above-mentioned first MSC obtains the forwarding information of the above-mentioned called user from the home location register HLR; if the obtained forwarding information includes Indicating that the called user has the indication information of the redirection number, the first MSC sends the redirection request to the network element.

Further, before the above-mentioned first MSC sends the redirection request to the network element in the above-mentioned second network, it also includes: when the above-mentioned called user configures the above-mentioned redirection number, the above-mentioned network element saves the above-mentioned redirection number and/or the above-mentioned The mapping relationship between the redirection number and the called user. The HLR saves the indication information for indicating that the called user has the redirection number.

Further, the above-mentioned network element sending the redirection number of the called user to the second MSC where the calling user is located according to the above-mentioned redirection request includes: the above-mentioned network element obtains the locally stored ID of the called user according to the above-mentioned redirection request. The above-mentioned redirection number; the above-mentioned network element sends the above-mentioned redirection number to the above-mentioned second MSC.

Further, the foregoing network element is a service control point SCP.

Further, the above-mentioned first network is a Code Division Multiple Access (CDMA) network, and the above-mentioned second network is an IP Multimedia Subsystem (IMS) network.

According to another aspect of the present invention, a device for forwarding a call is provided, which includes: a receiving module, configured to receive a redirection request sent by the first mobile switching center MSC where the called user in the first network is located; A module, configured to obtain the redirection number of the called user stored locally according to the redirection request; a sending module, configured to send the redirection number to the second MSC where the calling user is located, so that the second MSC according The received redirection number is used to forward the call; wherein, the device for forwarding the call is located in a second network different from the first network.

Further, the device for forwarding the call is a service control point SCP, the first network is a CDMA network, and the second network is an IP Multimedia Subsystem IMS network.

According to still another aspect of the present invention, a system for forwarding calls is provided, which includes: a first mobile switching center MSC where the called user in the first network is located, a network element in the second network, and a caller where the calling user is located. The second MSC, wherein the above-mentioned first MSC is used to send a redirection request to a network element in the second network; the above-mentioned network element is used to send the redirection number of the called user to the above-mentioned The second MSC where the calling user is located; the second MSC is configured to forward the call according to the received redirection number.

Further, the above-mentioned network element is a service control point SCP, the above-mentioned first network is a Code Division Multiple Access (CDMA) network, and the above-mentioned second network is an IP Multimedia Subsystem IMS network.

The present invention has the following beneficial effects: the present invention records the redirection authority and number of the called user with the network element equipment in different networks, and triggers the call to the network that actually performs service control to control the forwarded call, In this way, correct call forwarding is realized in a mixed networking scenario.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a schematic diagram of a CDMA2000 network according to related technologies;

FIG. 2 is a schematic diagram of a forwarding call flow in a CDMA2000 network according to related technologies;

Fig. 3 is the schematic diagram of IMS network and CDMA2000 network networking according to related technology;

FIG. 4 is a flowchart of a method for forwarding a call according to an embodiment of the present invention;

Fig. 5 is a preferred flow chart when a multi-service user sets a forwarding service according to an embodiment of the present invention;

Fig. 6 is a preferred flow chart of a multi-service user making a forwarded call according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of an apparatus for forwarding a call according to an embodiment of the present invention;

Fig. 8 is a schematic structural diagram of a system for forwarding calls according to an embodiment of the present invention.

Detailed ways

Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

Fig. 4 is a flowchart of a method for forwarding a call according to an embodiment of the present invention. As shown in Figure 4, the method for forwarding a call mainly includes the following steps:

S402, the first MSC where the called user in the first network is located sends a redirection request to a network element in the second network;

S404, the network element sends the redirection number of the called user to the second MSC where the calling user is located according to the redirection request. Preferably, the calling user can be in the first network, the second network, or other networks. That is to say, the called user can be in the same network as the calling user (for example, both are in the CDMA2000 network), or they can also be in different networks (for example, the called user is in the CDMA2000 network, and the calling user is in the GSM network). Network, or, PSTN (Public Switched Telephone Network, public switch telephone network), or, in the IMS network);

S406, the second MSC forwards the call according to the received redirection number.

In the hybrid networking scenario of the prior art, the redirection authority and the redirection number of the called user are not saved in the HLR, so that in the CDMA2000 network, it is impossible to obtain the called user's ID according to the procedures in the prior art. Forwarding authority, so that correct call forwarding cannot be performed in a mixed network scenario. In contrast to the embodiment of the present invention, the network element devices in different networks of CDMA2000 and IMS all record the redirection authority and the redirection number of the called user, and send the redirection number to the actual service provider after the forwarding call is triggered. IMS network for control and charging control, so as to realize correct call forwarding in the mixed network scenario.

Preferably, the above-mentioned first MSC sending the redirection request to the network element in the second network includes: the above-mentioned first MSC obtains the forwarding information of the above-mentioned called user from the home location register HLR; if the obtained forwarding information includes Indicating that the called user has the indication information of the redirection number, the first MSC sends the redirection request to the network element.

Through the above-mentioned HLR, it can be judged whether the called user has configured the redirection authority and the redirection number. Only in the case of configuration, the first MSC sends a redirection request to the network element in the second network, thereby optimizing the process and reducing unnecessary operation.

Preferably, before the first MSC sends the redirection request to the network element in the second network, it further includes: when the called user configures the redirection number, the network element saves the redirection number and/or To the mapping relationship between the number and the called user, the HLR saves the above indication information for indicating that the called user has the redirection number.

Through the above method, it is possible to store the indication information in the HLR and store the redirection number on the network element in the second network, so that the transmission of the redirection number in the hybrid network can be realized.

Preferably, the above-mentioned network element sending the redirection number of the called user to the second MSC where the calling user is located according to the above-mentioned redirection request includes: the above-mentioned network element obtains the locally saved ID number of the above-mentioned called user according to the above-mentioned redirection request. The above-mentioned redirection number; the above-mentioned network element sends the above-mentioned redirection number to the above-mentioned second MSC.

By storing the diversion number of the called user locally in the above network element, it is possible to implement correct call forwarding in a hybrid network scenario.

Preferably, the aforementioned network element is an SCP. Preferably, the SCP is on the AS in the second network. In the present invention, the above-mentioned device for storing and transmitting the redirection number is SCP, which is just an example, and it can also be other devices in the second network, for example, Media Gateway Control Function (Media Gateway Control Function, referred to as " MGCF") entities. Through the above manner, the embodiment of the present invention can be applied to the SCP scenario.

Preferably, the above-mentioned first network is a CDMA network, and the above-mentioned second network is an IMS network. The above-mentioned first network and second network are just an example of the present invention, and the present invention is not limited thereto. For example, the first network is a code division multiple access WCDMA network, and the second network is an IMS network. Through the above method, call forwarding under the CDMA and IMS networking can be realized.

In each of the above-mentioned embodiments, during the process of triggering various intelligent services of the called user through the IMS network, a prefix is added in front of the called number through the IMS network to prompt the MSC to trigger the SCP first according to the prefix, and then control the non-execution through the SCP. Guide the business process, but directly continue the called.

In the embodiment of the present invention, the forwarding service is divided into two parts: one part is that when the user registers the forwarding information, it needs to be recorded in both the HLR and the SCP. For business transfer, the specific corresponding number is irrelevant. The SCP records the forwarding authority and the user's various redirection number information; the other part is the forwarding call process, in which the redirection number is sent to the MSC through the relevant information stored in the SCP, so that the MSC can pass the redirection number Make a forwarded call. The processes corresponding to the above two parts will be described in detail below in conjunction with the accompanying drawings.

Fig. 5 is a preferred flowchart when a multi-service user sets a forwarding service according to an embodiment of the present invention. As shown in Figure 5, setting forwarding services for multi-service users mainly includes the following steps:

Step S501: the mobile user initiates a call, and the MSC identifies the smart user according to the subscription information of the user, and loads a series of smart service triggers signed by the calling user (in this embodiment, only one trigger needs to be signed to the SCP);

Step S502: When the call is processed to a trigger control point on the calling side, the MSC sends a trigger message to the SCP signed by the calling user according to the loaded trigger list, and the SCP records the forwarding setting information set by the user;

Step S503: the SCP replies with a response message;

Step S504: the MSC continues to trigger a service modification request message to the HLR, and the HLR records the setting information of the user.

Step S505: the HLR replies with a response message.

Fig. 6 is a preferred flow chart of a multi-service user making a forwarded call according to an embodiment of the present invention. As shown in Figure 6, the process for a multi-service user to forward a call includes the following steps:

Step S601: A call to a multi-service user occurs;

Step S602: According to the multi-service call connection mode, the call is connected to the IMS domain;

Steps S603-S605: According to the user's subscription information, the IMS network interacts with multiple ASs sequentially to control multiple services;

Step S606: The IMS network reroutes the call back to the MGCF, which doubles as the gateway office of the CDMA 2000 network;

Step S607: The MGCF identifies that the called party is a mobile user, and requests the called party's related service information from the HLR to which the called party belongs, and the MGCF is also responsible for triggering and other processing of the intelligent flow for the multi-service user;

Step S608: the HLR sends a routing request message to the landed MSC to which the user belongs;

Step S609: The landing MSC allocates a temporary roaming number TLDN, and returns a routing request message to the HLR, carrying the temporary roaming number TLDN;

Step S610: the HLR returns the called location information, carrying the TLDN number assigned by the landed MSC;

Step S611: The MSC connects the call to the office where the called user is located according to the TLDN number, and the called party rings;

Step S612: The called user does not answer for a long time, and after the ringing timeout, according to the service list obtained by the user from the HLR, it is found that the user has activated no answer forwarding, and then sends a redirection request to the originating MSC, that is, the MGCF;

Step S613: The MGCF is different from the processing in the traditional CDMA 2000 at this time, no longer requests the called number from the HLR, but returns a failure to the IMS domain, carrying the reason for the connection failure;

Step S614: The IMS domain performs forwarding connection according to the forwarding authority and redirection number recorded in the SCP (AS), and releases the call to the original called party.

The present invention also provides an embodiment of an apparatus for forwarding a call, which can use the method for forwarding a call described in the above embodiments. As shown in FIG. 7, the device for forwarding a call according to the embodiment of the present invention includes: a receiving module 702, configured to receive a redirection request sent by the first mobile switching center MSC where the called user in the first network is located; an acquisition module 704, configured to obtain the locally stored redirection number of the called user according to the redirection request; a sending module 706, configured to send the redirection number to the second MSC where the calling user is located, so that the second MSC Forwarding the call according to the received redirection number; wherein, the device for forwarding the call is located in a second network different from the first network.

In the embodiment of the present invention, the redirection number of the called user is recorded by a network element device in a network different from that of the calling user and the called user, and the redirection number is sent to the calling user after the forwarding call is triggered , so as to implement correct call forwarding in a mixed networking scenario.

Preferably, the calling user can be in the first network, the second network, or other networks. That is to say, the called user can be in the same network as the calling user (for example, both are in the CDMA2000 network), or they can also be in different networks (for example, the called user is in the CDMA2000 network, and the calling user is in the GSM network). network, or, PSTN (Public Switched Telephone Network, public switch telephone network), or, in the IMS network).

Preferably, the device for forwarding calls is a service control point SCP, the first network is a CDMA network, and the second network is an IP Multimedia Subsystem IMS network. Through the above method, call forwarding under the CDMA and IMS networking can be realized.

Preferably, in the above device embodiment, the first MSC obtains the forwarding information of the called user from the home location register HLR; if the obtained forwarding information includes an indication for indicating that the called user has the above redirection number information, the first MSC sends the redirection request to the device for forwarding the call.

Preferably, before the first MSC sends a redirection request to the device for forwarding the call, when the called user configures the redirection number, the device for forwarding the call saves the redirection number and/or the redirection number For the mapping relationship with the called user, the HLR stores the indication information for indicating that the called user has the redirection number.

Preferably, the sending module 706 sending the redirection number of the called user to the second MSC where the calling user is located according to the redirection request includes: the sending module 706 obtains the locally stored ID of the called user according to the redirection request. The above-mentioned redirection number; the sending module 706 sends the above-mentioned redirection number to the above-mentioned second MSC.

The present invention also provides an embodiment of a system for forwarding a call, which can use the method for forwarding a call described in the above embodiments. As shown in Figure 8, the system for forwarding calls includes: the first MSC 802 where the called user in the first network is located, the network element 804 in the second network, and the second MSC 806 where the calling user is located, wherein the above The first MSC 802 is used to send a redirection request to a network element in the second network; the above-mentioned network element 804 is used to send the redirection number of the called user to the second network where the calling user is located according to the above-mentioned redirection request. MSC; the above-mentioned second MSC 806, which is used to forward the call according to the received above-mentioned redirection number.

In the embodiment of the present invention, the redirection number of the called user is recorded by a network element device in a network different from that of the calling user and the called user, and the redirection number is sent to the calling user after the forwarding call is triggered , so as to implement correct call forwarding in a mixed networking scenario.

Preferably, in the above-mentioned system embodiment, the first MSC 802 obtains the forwarding information of the called user from the home location register HLR; if the obtained forwarding information includes an indication for indicating that the called user has the above-mentioned redirection number information, then the first MSC 802 sends the above-mentioned redirection request to the network element 804.

Preferably, before the first MSC 802 sends a redirection request to the network element 804, when the above-mentioned called user configures the above-mentioned redirection number, the network element 804 saves the above-mentioned redirection number and/or the above-mentioned redirection number and the above-mentioned called user's mapping relationship, the HLR stores the indication information used to indicate that the called user has the redirection number.

Preferably, the network element 804 sends the redirection number of the above-mentioned called user to the second MSC 806 where the above-mentioned calling user is located according to the above-mentioned redirection request. The above-mentioned redirection number; the network element 804 sends the above-mentioned redirection number to the second MSC 806.

Preferably, the above-mentioned calling user may be in the first network, the second network, or other networks. That is to say, the called user can be in the same network as the calling user (for example, both are in the CDMA2000 network), or they can also be in different networks (for example, the called user is in the CDMA2000 network, and the calling user is in the GSM network). network, or, PSTN (Public Switched Telephone Network, public switch telephone network), or, in the IMS network).

Preferably, the above-mentioned network element 804 is a service control point SCP, the above-mentioned first network is a CDMA network, and the above-mentioned second network is an IP Multimedia Subsystem IMS network. Through the above method, call forwarding under the CDMA and IMS networking can be realized.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Alternatively, they may be implemented in program code executable by a computing device so that they may be stored in a storage device to be executed by a computing device, and in some cases in an order different from that shown here The steps shown or described are carried out, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps among them are fabricated into a single integrated circuit module for implementation. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A method for forwarding a call, comprising: The first mobile switching center MSC where the called user in the first network is located sends a redirection request to a network element in the second network; The network element sends the redirection number of the called user to the second MSC where the calling user is located according to the redirection request; The second MSC forwards the call according to the received redirection number. 2. The method according to claim 1, wherein the first MSC sending a redirection request to a network element in the second network comprises: The first MSC obtains the forwarding information of the called subscriber from the home location register HLR; If the obtained forwarding information includes indication information for indicating that the called user has the redirection number, the first MSC sends the redirection request to the network element. 3. The method according to claim 2, further comprising: before the first MSC sends a redirection request to a network element in the second network: When the called user configures the redirection number, the network element saves the redirection number and/or the mapping relationship between the redirection number and the called user, and the HLR saves the indicating that the called user has the indication information of the redirection number. 4. The method according to claim 1, wherein the network element sending the redirection number of the called user to the second MSC where the calling user is located according to the redirection request comprises: The network element obtains the redirection number of the called user stored locally according to the redirection request; The network element sends the redirection number to the second MSC. 5. The method according to any one of claims 1 to 4, wherein the network element is a Service Control Point (SCP). 6. The method according to any one of claims 1 to 4, wherein the first network is a Code Division Multiple Access (CDMA) network, and the second network is an IP Multimedia Subsystem (IMS) network. 7. A device for forwarding calls, comprising: The receiving module is used to receive the redirection request sent by the first mobile switching center MSC where the called user in the first network is located; An acquisition module, configured to acquire the locally stored redirection number of the called user according to the redirection request; A sending module, configured to send the redirection number to a second MSC where the calling user is located, so that the second MSC forwards the call according to the received redirection number; Wherein, the device for forwarding a call is located in a second network different from the first network. 8. The device according to claim 7, wherein the device for forwarding the call is a Service Control Point SCP, the first network is a Code Division Multiple Access (CDMA) network, and the second network is an IP Multimedia Subsystem System IMS network. 9. A system for forwarding calls, characterized in that it comprises: the first mobile switching center MSC where the called user in the first network is located, the network element in the second network, the second MSC where the calling user is located, in, The first MSC is configured to send a redirection request to a network element in the second network; The network element is configured to send the redirection number of the called user to the second MSC where the calling user is located according to the redirection request; The second MSC is configured to forward the call according to the received redirection number. 10. The system according to claim 9, wherein the network element is a Service Control Point SCP, the first network is a Code Division Multiple Access (CDMA) network, and the second network is an IP Multimedia Subsystem (IMS) network .

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