WO2010088819A1

WO2010088819A1 - Calling back realization method and system

Info

Publication number: WO2010088819A1
Application number: PCT/CN2009/073739
Authority: WO
Inventors: 周旭强; 秦延涛; 孙祥新
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-02-06
Filing date: 2009-09-03
Publication date: 2010-08-12
Also published as: CN101483851A; CN101483851B

Abstract

A calling back realization method and system are disclosed in the present invention, wherein the method includes the steps of: after a first terminal triggered an Unstructured Supplementary Service Data service USSD service, routing a USSD request message sent by the first terminal to the service control point of the home-location by the core network of the roaming-location of the first terminal via a home-location register of the home-location of the first terminal, and triggering the calling back service of the service control point, wherein the USSD request message carries the number of a second terminal; sending a predetermined message to a service switching point by the service control point to inform the service switching point to perform calling; calling the first terminal and the second terminal by the service switching point, and realizing the talk between the first terminal and the second terminal. By applying the present invention, calling can be accomplished under the control of service during the roaming of the user, charging may be more reasonable, and the questions of the unreasonable charging and the indetermination of the way of rate selection in the related art are avoided.

Description

Callback implementation method and system

TECHNICAL FIELD The present invention relates to the field of communications, and in particular, to a callback implementation method and system. BACKGROUND With the development of communication technologies and the interconnection of international communication networks, mobile phones can roam to more and more countries for use, thereby facilitating communication in daily life and travel. However, the communication tariff standards vary from country to country, and there are even large differences. Therefore, it is difficult to calculate the cost of the call when conducting international roaming (especially when roaming from a country with a low tariff standard to a country with a high tariff). And because the roaming rate is too high, the cost of the call initiated by the roaming user is too expensive. On the other hand, due to differences in the protocols of the mobile communication network parts used in various countries, for example, mobile intelligent networks in some countries use the Customized Applications for Mobile network Enhanced Logic (CAMEL) protocol. However, some countries do not support the CAMEL protocol. In this way, when a country's prepaid subscribers roam to other countries, there is a problem that the subscriber cannot initiate a call as a calling subscriber because the network cannot trigger the call. In this case, the current method adopted by the operator is to limit all outgoing calls to the user in the Home Location Register (HLR). BAOC) information, restricting the user from initiating a call, that is, the user roaming in this case cannot initiate a call and can only answer the call. Some solutions have been proposed for various problems when a roaming user initiates a call. In a solution, the user can send a callback request to the Service Control Point (SCP), and the SCP notifies the service switching point (Service Switching Point). The user is connected to the user; when the user is successfully connected, the SCP stores the call record, and the associated user starts the call; after the call ends, the SCP determines whether the user is The user who is the first to call, if yes, finds and reads the call record associated with the user, adjusts the duration of the user's call according to the read call record; otherwise, determines the duration of the user's call as its actual call duration. The scheme can determine the call duration of the callback service, and by adding a prefix code to the calling number, the SCP can recognize the other callback request, and record the connection between the two parties when the two parties start the call. After the end, the call duration of the user who first called is adjusted, so that accurate timing can be achieved, and the basis for flexible charging can be laid. After adopting this scheme, although the purpose of accurate timing can be achieved, the problem that the calling user cannot initiate a call due to different protocols adopted by different networks cannot be solved. Therefore, it can be seen that the problem that the calling user cannot initiate a call due to different protocols adopted by different networks has not yet proposed an effective solution. SUMMARY OF THE INVENTION The present invention has been made in view of the problems in which different protocols employed by different networks in the related art cause a caller to be unable to initiate a call, and the billing is unreasonable and the rate selection method is uncertain. Therefore, the main purpose of the present invention is to Provide a callback implementation. According to an aspect of the present invention, a callback implementation method is provided for implementing a call of a first terminal to a second terminal in a case where the first terminal is in a roaming state. The callback implementation method according to the present invention includes: after the first terminal triggers the unstructured supplementary service data service USSD service, the core network of the roaming place of the first terminal sends the USSD request message sent by the first terminal to the home of the first terminal. The home location register of the ground is routed to the service control point of the home location, and the callback service of the service control point is triggered, wherein the USSD request message carries the number of the second terminal; the service control point sends the predetermined message notification service to the service switching point. The switching point performs a call; the service switching point calls the first terminal and the second terminal to implement a call between the first terminal and the second terminal. The processing of the core network routing the USSD request message to the service control point via the home location register may include: after receiving the USSD request message from the core network in the home location register, according to the access code to the USSD request message in the USSD request message The processing is performed to obtain the address of the service control point, and the processed USSD message is sent to the service control point. In addition, after the callback service is triggered, the method may further include: the service control point sending an SRI SM message to the home location register, where the SRI_SM message is used to request to obtain the network address of the visited location register of the roaming place; Point receiving from the home location register The response message of the SRI SM message, thereby obtaining the network address of the visited location register. In addition, the process of the service switching point calling the first terminal and the second terminal may include: the service switching point calls the first terminal, and after the first terminal answers, the service switching point sends the first terminal response event to the service control point; The service control point notifies the service switching point to call the second terminal, and the service switching point calls the second terminal; after the second terminal answers, the service switching point sends the second terminal response event to the service control point. At this time, the service control point may notify the service switching point to call the second terminal by sending a request basic call state model event report message and a connection message to the service switching point, where the connection message carries the number of the second terminal. Preferably, after the callback service is triggered, the USSD service is actively terminated, or the USSD service itself ends itself. Preferably, the predetermined message may include the following: a call attempt message, a request basic call state model event report message, a request charging message, and a continuation message, where the start attempt message carries the number of the first terminal for service The switching point calls the first terminal. According to another aspect of the present invention, a callback implementation system is provided for implementing a call of a first terminal to a second terminal in a case where the first terminal is in a roaming state. The callback implementation system according to the present invention includes a service control point and a service switching point. The service control point includes: a receiving module, configured to receive a USSD request message sent by the first terminal after the first terminal triggers the USSD service, where the USSD request message is sent by the core network of the roaming terminal of the first terminal to the first terminal The home location register of the home is routed to the service control point, and the USSD request message carries the number of the second terminal; the triggering module is configured to trigger the callback service; and the sending module is configured to send the predetermined message notification service to the service switching point. The switching point performs a call. The service switching point includes: a calling module, configured to call the first terminal and the second terminal in response to the notification of the sending module, so as to implement a call between the first terminal and the second terminal. Specifically, the calling module is configured to use the first terminal as the called terminal and call the first terminal in response to the predetermined message; and, after the first terminal answers, convert the first terminal to the calling terminal in response to the notification of the sending module. Make a call to the second terminal. 4 In particular, the predetermined message includes the following message: Start the call message, request the basic call ^! The dog mode event 4 report message, the application charging message, and the continuation message, wherein the initiation call message carries the number of the first terminal, so that the service switching point calls the first terminal. With the above technical solution of the present invention, the callback service on the SCP is triggered by the unroken supplementary data service message sent by the international roaming user, and the call is completed under the service control, and the subscription service of the user is not supported on the roaming network. The corresponding communication protocol causes the problem that the calling party cannot be called. On the other hand, since the charging rate is the service rate of the user's domestic carrier, the charging can be made more reasonable, and the charging in the related technology is avoided. And the problem that the rate selection method is uncertain; the present invention also has the advantage that it is easy to implement and does not require modification of existing network equipment. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart showing a method for implementing a callback according to an embodiment of the method of the present invention; FIG. 2 is a schematic diagram showing a process for implementing a callback according to an embodiment of the method of the present invention; FIG. 4 is a block diagram of a callback implementation system in accordance with an embodiment of the present invention; FIG. 5 is a block diagram of a system for implementing a callback according to an embodiment of the present invention; FIG. A schematic diagram of the connection between the callback implementation system and the core network. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Functional Description In the related art, the calling terminal is in a roaming state (the protocol used by the roaming place and the home place is different, for example, international roaming), the call cannot be initiated as a calling party, and the call charging is unreasonable. The embodiment of the present invention proposes that in a Global System for Mobile communication (GSM) network, an international roaming user sends an unstructured Supplementary Service Data (Unstructured Supplementary Service Data), which is called a USSD message. In the manner of triggering the callback service on the SCP, so as to initiate a call to the called party under the control of the service The purpose of calling and talking to the called party. In the solution of the present invention, the USSD message (the number carrying the called terminal) is initiated by the terminal, sent to the SCP via the roaming network and the HLR, and then the SCP issues a call command, and the voice circuit is initiated from the terminal country when the call is made, and the roaming network only The Integrated Service Digital Network User Part (ISUP) or the Telephone User Part (TUP) signaling is required to process USSD messages and ordinary voice calls. Considering that any GSM mobile network 啫P will support the Mobile Application Part (also called MAP) (also known as Mobile User Part) protocol and ISUP/TUP protocol, because USSD is standard MAP signaling, it is easy to use. The solution of the invention is achieved. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. In the following embodiments, the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and although the logical order is illustrated in the flowchart, in some cases The steps shown or described may be performed in an order different from that herein. Method Embodiment In this embodiment, a callback implementation method is provided for implementing a call of a first terminal to a second terminal in a case where the first terminal is in a roaming state. 1 is a flowchart of a callback implementation method according to an embodiment of the method of the present invention. As shown in FIG. 1, the method in the embodiment of the present invention includes a step S102, a step S104, and a step S106: Step S102, at the first After the terminal triggers the USSD service, the core network of the roaming terminal of the first terminal routes the USSD request message sent by the first terminal to the SCP of the home location through the HLR of the home location of the first terminal, and triggers the callback service of the SCP, where The USSD request message carries the number of the second terminal. In step S104, the SCP sends a predetermined message to the SSP to notify the SSP to make a call. In step S106, the SSP calls the first terminal and the second terminal to implement a call between the first terminal and the second terminal. The process of the core network routing the USSD request message to the SCP via the HLR may include: after the HLR receives the USSD request message from the core network, according to the USSD request message. The access code processes the USSD request message, obtains the address of the SCP, and sends the processed USSD message to the SCP. After that, after the callback service is triggered, the SCP may send an SRI SM (SendRoutinglnfoForSM) message to the HLR, and the SRI_SM message is used to request to obtain the network address of the Visited Location Register (VLR) of the roaming place. The SCP receives the network address of the VLR from the HLR, which preferably can be carried in the SRI-SM response message. In addition, the processing of the SSP to the first terminal and the second terminal may include: the SSP calls the first terminal, and after the first terminal answers, the SSP reports the first terminal response event to the SCP; the SCP notifies the SSP to call the second terminal, And the SSP calls the second terminal; after the second terminal answers, the SSP sends the second terminal response event to the SCP. The SCP may notify the SSP to call the second terminal by sending a request basic call state model event report message and a connection message to the SSP, where the connection message carries the number of the second terminal. In addition, the foregoing predetermined message may include the following messages: Initiate Call Attempt (IC) message, Request Basic Call State Model Event Report (RequestReportBCSMEvents, Cartridge called RRBE) message, and application charging (AppCharging, the cylinder is called AC) The message and the continuation (Continuation, CUE) message (for indicating the connection), wherein the ICA message carries the number of the first terminal for the SSP to call the first terminal. FIG. 2 is a schematic diagram of processing of a callback implementation method according to an embodiment of the method of the present invention, showing a schematic diagram of execution of the above processing. As shown in FIG. 2, the terminal A (the calling terminal, that is, the first terminal described above) issues a USSD request message (carrying the number of the called terminal (ie, the second terminal)) to the core network of the roaming place ( Not shown), the request message is routed to the HLR to which the terminal belongs via the roaming network, and the HLR sends a USSD message to the SCP to trigger the callback service on the SCP; the callback service sends a call command to the SSP, and the SSP returns the terminal A. After the terminal rings and answers, the SSP calls the terminal B again (calls through the Mobile Switch Center (MSC) VLR and the Base Transceiver Station (BTS)) to implement the terminal A. A call with terminal B. 3 is a signaling flow diagram of a detailed processing procedure of a callback implementation method in accordance with an embodiment of the method of the present invention. As shown in FIG. 3, the following may specifically include the following steps: (1) The mobile terminal A initiates a USSD request message (which carries the number of the called terminal B), and the roaming core network routes the request message to the terminal home HLR;

(2) After the HLR process, the USSD request message is sent to the SCP, and the callback service on the SCP is triggered; ((1) and (2) correspond to step S102) (3) the callback service delivers the SRI SM request to the HLR, and acquires the terminal. The network address where the VLR is roaming;

(4) The HLR returns a SRI SM Res (SRI SM response) message to the SCP;

(5) The callback service (callback service on the SCP) returns USSD_Res (response to the USSD request message) to the HLR; (6) the callback service (callback service on the SCP) initiates ICA, RRBE, AC, and SSP to the SSP.

CUE message, the called number in ICA is the number of terminal A; ((6) corresponds to step S104)

(7) SSP calls terminal A, terminal A rings;

(8) After the terminal A answers the call, the SSP answers the ERB (EventReportBCSM) event to the SCP. (9) After receiving the response event of the terminal A, the SCP service sends the RRBE and CON to the SSP.

(Connect) message, the number carried in the CON message is the number of the terminal B;

(10) SSP calls terminal B, terminal B rings;

(11) The terminal B responds, the SSP sends an ERB event to the terminal B of the SCP, and the terminal A and the terminal B enter the call state. ((7) to (11) correspond to step S106.) It should be noted that in the above step (9), the SSP needs to convert the terminal A from the called role to the calling role, that is, logically, the subsequent process Corresponding to the terminal A calling the terminal B, it is necessary to have the function of performing the above-described call conversion processing when implementing the above method. The implementation process of the callback service described above may be composed of two services loaded on the SCP, which are respectively called USSD service and call service. The USSD service is responsible for triggering the terminal callback request, obtaining the terminal number and the called number, obtaining the VLR address where the terminal roaming, and invoking the call service and transmitting the required parameters to the call service; the call service is responsible for issuing the call instruction. Give the SSP, and cooperate with the SSP to complete tasks such as connection between the calling parties, BCSM event monitoring, and accounting. Preferably, the USSD service can be terminated after the call service is invoked (the USSD service itself can also end itself) to save the SCP conversation resources. The specific implementation of the USSD service and call service will be described in detail below.

USSD service (corresponding to the above steps (1) to (5)): The mobile terminal A inputs a USSD request through a terminal (which may be a mobile terminal), and the format is: * access code * called number #, where the access code is The USSD service logical access code, different access codes can correspond to different USSD service logics. The USSD service delivers the SRI-SM message to the HLR. Because the terminal initiates the USSD request, the VLR that the roaming station needs to exchange messages with the HLR, that is, the HLR must have updated the VLR address information of the terminal, so the HLR The VLR address (NetworkNode_Number parameter) carried in the SRI_SM_Res message returned after receiving the SRI SM message is accurate and valid. The USSD service determines whether to allow callback according to the VLR address (if the VLR address is in the blacklist, it prohibits the callback) and uses different callback rates according to the VLR's address. The USSD service returns the HLR to the USSD-Res and invokes the call service, and passes the obtained number, rate, and other parameters to the call service, and then ends the operation itself. Call service (corresponding to steps (6) to (11) above): After the call service is triggered, the SCP will generate a new session, in which the service will deliver the ICA/RRBE/AC/CUE message (ie The predetermined message mentioned above can be sent to the SSP by means of a Begin dialog multi-component, thereby reducing the signaling load. The SSP connects the terminal A according to the terminal number carried in the ICA. After the terminal A rings and responds, the service sends the RRBE/CON message again. The SSP converts the information of the terminal A from the called party to the calling party, and then the CON is called CON. The terminal number carried in the message is connected to the called terminal B. This is equivalent to terminal A calling terminal B. When terminal B picks up the phone and answers, terminal A and terminal B enter a normal call state. After the call ends, the call service can configure the management data to determine whether the terminal A response or the terminal B response is the charging start time point. Specifically, the operator can select and decide according to the market feedback, thereby making the charging more reasonable. Through the foregoing processing, the problem that the user cannot make a call when the roaming network does not support the communication protocol corresponding to the user subscription service can be solved; because in the above processing, the voice circuit is initiated from the user (home country), and the rate is the national The operator's service rate, therefore, can guarantee the reasonableness of the billing (calling charges); In the above processing, the callback service replaces the usually used query with the SRI-SM message ( AnyTimelnterrogation, the tube is called ATI) The message is used to obtain the address of the user roaming network node, and the user information (ProvideSubscriberlnfomation, called PSI) message interaction between the HLR and the VLR is omitted while satisfying the application requirement. Correspondingly, the VLR does not need to page the user, thereby saving network resources, improving the service response speed, and avoiding the problem that the user call is interrupted due to the long waiting time. System Embodiment In this embodiment, a callback implementation system is provided for implementing a call of a first terminal to a second terminal in a case where the first terminal is in a roaming state. 4 is a block diagram of a callback implementation system in accordance with an embodiment of the present invention. As shown in FIG. 4, the callback implementation system includes SCP 1 and SSP 2. Specifically, the specific structures of SCP 1 and SSP 2 in FIG. 4 are as follows:

The SCP 1 includes: a receiving module 12, configured to receive a USSD request message sent by the first terminal after the first terminal triggers the USSD service, where the USSD request message is sent by the core network of the first terminal to the home network of the first terminal The HLR is routed to the SCP, and the USSD request message carries the number of the second terminal; the triggering module 14 is configured to trigger the callback service; and the sending module 16 is configured to send the predetermined message to the SSP to perform the call by using the SSP;

The SSP 2 includes: a calling module 22, configured to call the first terminal and the second terminal in response to the notification of the sending module, thereby implementing a call between the first terminal and the second terminal. The foregoing predetermined message may include the following messages: an ICA message, an RRBE message, an AC message, and a CUE message, where the ICA message carries the number of the first terminal, so that the SSP calls the first terminal. The calling module 22 may, in response to the predetermined message, use the first terminal as the called terminal and call the first terminal, that is, the first terminal as the called party; and, after the first terminal answers, respond to the sending module 16 The notification converts the first terminal to the calling terminal to make a call to the second terminal. The call is initiated by the calling module 22, but the call of the first terminal to the second terminal is realized by the conversion of the calling role of the first terminal. In the above system, the SCP (callback service) replaces the commonly used ATI message with the SRI-SM message to obtain the user roaming network node address from the HLR, which satisfies the application requirements and eliminates the PSI between the HLR and the VLR. The message interaction, correspondingly, the VLR does not need to page the user, thereby saving network resources, improving the service response speed, and avoiding the problem that the user call is interrupted due to the long waiting time. 5 is a schematic diagram of a connection between a callback implementation system and a core network according to an embodiment of the system of the present invention, As shown in FIG. 5, the system is composed of an SCP and an SSP, and the SCP is composed of a Signal Interface Unit (SIU) and a service processor. The service processor is used to run the business logic, and the service processing is performed. The machine is connected to the SIU via Transmission Control Protocol/Internet Protocol (TCP/IP). Both the SCP and the SSP access the core network using the standard SS7 signaling interface. The solid line in the figure indicates the voice channel relay, and the dotted line indicates the signaling link. With the above system, the user can not solve the problem that the roaming network does not support the communication protocol corresponding to the user subscription service without modifying the existing network equipment and configuring only the required link, voice channel resources, and routing data. The problem of making a call, ensuring the reasonableness of billing (reducing the cost of the call). In summary, with the above technical solution of the present invention, the call back service on the SCP is triggered by the unroken supplementary data service message sent by the international roaming user, and the call is completed under the service control, and the roaming network is solved on the one hand. The communication protocol corresponding to the user's contracted service is not supported, and the problem of the calling party cannot be performed. On the other hand, since the billing rate is the service rate of the user's home operator, (the calling fee is higher than that of the international roaming) In the case of a low rate, the user can save the call charge, avoid the problem that the billing is unreasonable in the related art, and the rate selection method is uncertain; in addition, the implementation of the present invention does not need to modify the existing network equipment and implement The single order also satisfies people's needs for different types of communication services, and enriches the types of operators' services, and has a good market prospect. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

A callback implementation method, configured to implement the call of the first terminal to the second terminal when the first terminal is in a roaming state, where the method includes:

After the first terminal triggers the unstructured supplementary service data service USSD service, the core network of the roaming area of the first terminal sends the USSD request message sent by the first terminal to the home location of the first terminal. The home location register is routed to the service control point of the home location, and the callback service of the service control point is triggered, where the USSD request message carries the number of the second terminal;

Sending, by the service control point, a predetermined message to the service switching point to notify the service switching point to make a call;

The service switching point calls the first terminal and the second terminal to implement a call between the first terminal and the second terminal.

2. The method according to claim 1, wherein the processing by the core network to route the USSD request message to the service control point via the home location register comprises: receiving, at the home location register After the USSD request message from the core network, the USSD request message is processed according to the access code in the USSD request message, and the address of the service control point is obtained, and sent to the service control point. The processed USSD message.

The method according to claim 1, wherein after the callback service is triggered, the method further includes:

The service control point sends an SRI_SM message to the home location register, where the SRI_SM message is used to request to acquire a network address of the visited location register of the roaming place;

The service control point receives a response message from the SRI_SM message of the home location register to obtain a network address of the visited location register.

The method according to claim 1, wherein the processing of the service switching point to call the first terminal and the second terminal comprises: The service switching point calls the first terminal, and after the first terminal answers, the service switching point reports the first terminal response event to the service control point;

The service control point notifying the service switching point to call the second terminal, and calling the second terminal by the service switching point;

After the second terminal responds, the service switching point reports the second terminal response event to the service control point. The method according to claim 4, wherein the service control point notifies the service switching point to call the second terminal by sending a request basic call state model event report message and a connection message to the service switching point. The connection message carries the number of the second terminal. The method according to claim 1, wherein after the callback service is triggered, the USSD service is actively terminated, or the USSD service itself ends itself. The method according to any one of claims 1 to 6, wherein the predetermined message comprises the following messages: a start attempt call message, a request basic call state model event report message, a request charging message, and a continuation message, wherein The startup call message carries the number of the first terminal, so that the service switching point calls the first terminal. A callback implementation system is configured to implement the call of the first terminal to the second terminal when the first terminal is in a roaming state, where the system includes:

Business control points, including:

a receiving module, configured to receive a USSD request message sent by the first terminal after the first terminal triggers the USSD service, where the USSD request message is sent by the core network of the roaming area of the first terminal The home location register of the home location of the terminal is routed to the service control point, and the USSD request message carries the number of the second terminal; the triggering module is configured to trigger the callback service;

a sending module, configured to send a predetermined message to the service switching point to notify the service switching point to make a call;

The service switching point includes: a calling module, configured to call the first terminal and the second terminal in response to the notification of the sending module, so as to implement a call between the first terminal and the second terminal.

The system according to claim 8, wherein the predetermined message comprises the following messages: a call attempt message, a request basic call state model event report message, a request charging message, and a continuation message, wherein the starting message The call message carries the number of the first terminal, so that the service switching point calls the first terminal.

10. The system of claim 8 wherein:

The calling module is configured to use the first terminal as a called terminal and call the first terminal in response to the predetermined message; and to notify the sending module after the first terminal answers Converting the first terminal to a calling terminal to make a call to the second terminal.