CN100512524C - Method for precisely roaming limit - Google Patents

Abstract

The invention discloses a method for precise roaming restriction, which includes the following steps: A. setting a roaming restriction range on the SCP for a terminal that has signed a roaming restriction service, and signing an intelligent trigger for the terminal on the HLR to which the terminal belongs; B. The calling terminal initiates a call, obtains the smart trigger from the HLR to which the terminal that has subscribed to the roaming restriction service belongs, triggers the corresponding SCP according to the address of the smart trigger to obtain terminal location information, and judges whether the terminal is located in the set If yes, instruct the calling service MSC/VLR to continue the communication; otherwise, instruct the calling service MSC/VLR to refuse the communication. The present invention solves the problem that the roaming restriction range of the terminal is too large, and achieves the purpose of accurately restricting the roaming range of the terminal; at the same time, it also reduces the roaming restriction of the terminal due to changes in the wireless environment where the terminal is located. impact.

Description

A Method of Precise Roaming Restriction

technical field

The invention relates to the technical field of communication, in particular to a method for precise roaming restriction.

Background technique

With the rapid development of communication technology, the number of global communication users is increasing rapidly, and the profit growth points of the communication industry are increasingly reflected. More and more investors hope to enter the communication operation industry to obtain greater profits. profit. However, for developing countries, countries dominated by mountains, and rural or remote areas, if investors directly invest in the operation of fixed networks, there are problems of large investment, long profit cycle, and relatively high risks; For mobile networks, it is difficult to obtain mobile licenses, and it is subject to the supervision of various aspects such as national tariffs.

In this case, some investors propose to build a mobile network, but operate it as a fixed network. When operating a mobile network as a fixed network, if the operator does not limit or cannot well limit the roaming range of the terminal, it is no different from the operator simply investing in the operation of the mobile network, and it is bound to be impossible to realize the operation of the mobile network as a fixed network Purpose. Therefore, in order to achieve the purpose of operating the mobile network as a fixed network and better operate the mobile network as a fixed network, it is necessary to limit the roaming range of the terminal, that is, to restrict the roaming of the terminal.

In addition, for wireless operators, there are also some terminals that do not require roaming, such as wireless public phone terminals. Generally speaking, these terminals that do not require roaming do not need to move themselves; on the contrary, if the range that the terminal is allowed to roam is too large, that is, the range that the terminal is allowed to move is too large, which is not conducive to the management of the terminal. If some wireless public telephone terminals are stolen, they can be used to steal calls, which will bring certain economic losses to the operators. Therefore, in this case, the operator also needs to restrict the roaming of the terminal, and hopes that the roaming restriction performed on the terminal should be as precise as possible.

In the prior art, the solution usually adopted for restricting the roaming of the terminal is to sign a mobile switching center/visitor location register (MSC/VLR) identifier that allows the terminal to roam on the home location register (HLR) of the terminal, thereby restricting the terminal to Within the area covered by one or several MSCs/VLRs.

However, since the roaming restriction range of the terminal is closely linked with the MSC/VLR in the prior art, the following problems inevitably exist when restricting the roaming of the terminal:

1. The roaming restriction range of the terminal is too large. Using the above solution, the range of roaming restrictions on the terminal cannot be further narrowed. The minimum coverage must be the range covered by an MSC/VLR, and usually the range covered by an MSC/VLR can reach hundreds of square kilometers. Such a range It is obviously too large for the roaming restriction of the terminal.

2. Changes in the wireless environment where the terminal is located may affect roaming restrictions on the terminal.

When testing, planning, optimizing or expanding the mobile communication network, the MSC/VLR which is limited by the terminal itself is likely to undergo some changes: if the MSC/VLR only changes in the size of the coverage area, although this will not affect the terminal The roaming restriction carried out will have a serious impact, but it will certainly have an impact on the scope of the terminal roaming restriction; if the attributes of the MSC/VLR itself have undergone major changes, for example, when testing the mobile communication network, the operator will test the MSC/VLR The attributes of the VLR itself have been initialized, and during the period of testing the mobile communication network, the roaming restrictions imposed on the terminal by the MSC/VLR may not exist, which will definitely affect the roaming restrictions on the terminal .

In addition, for a terminal at the junction of two MSCs/VLRs, the terminal may be within the common coverage of the two MSCs/VLRs; range, when the wireless environment of another MSC/VLR changes, the terminal may not be able to communicate normally, thus correspondingly reducing the range of roaming restrictions on the terminal, which in turn affects the roaming restrictions on the terminal.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for precise roaming restriction, so as to accurately limit the range of terminal roaming and reduce the impact of changes in the wireless environment on terminal roaming restriction.

In order to achieve the above object, the present invention provides a method for precise roaming restriction, comprising the following steps:

A. On the service control point, set the roaming restriction range for the terminal that signed the roaming restriction service, and save the roaming restriction range of the terminal in the service control point of the intelligent network system, or in a dedicated database, or in the service control point in the database shared with other entities, and sign up for the terminal with a smart trigger on the home location register to which the terminal belongs, wherein the address of the smart trigger is the address of the service control point, and the setting of roaming restrictions for the terminal The scope includes: setting the latitude and longitude range that the operator allows the terminal to roam as the roaming restriction range of the terminal, or setting the latitude and longitude range that the operator allows the terminal to roam and the positioning accuracy range of the positioning technology used to obtain the terminal location information The range of latitude and longitude covered by the superposition is set as the roaming restriction range of the terminal;

B. The calling terminal initiates a call, obtains the smart trigger from the home location register to which the terminal that subscribed to the roaming restriction service belongs, and triggers the corresponding service control point to execute the precise roaming restriction service according to the address of the smart trigger, wherein , precise roaming restriction services specifically include:

The service control point obtains the location information of the terminal, and judges whether the terminal is located within the set roaming restriction range according to the location information, and if so, instructs the calling service mobile switching center/visitor location register to continue communication; otherwise, instructs the calling The serving MSC/VLR rejects the communication.

In the above solution, when the terminal that subscribes to the roaming restriction service is the calling party, the acquisition of the smart trigger from the home location register to which the terminal that subscribes to the roaming restriction service belongs includes: calling service mobile switching center/visited location The register sends a location registration notification message to the calling home location register, and registers the location of the calling terminal; the calling home location register receives the location registration notification message, and carries the originating intelligent trigger signed by the calling terminal in the location registration notification response The message is returned to the calling service mobile switching center/visitor location register; the calling service mobile switching center/visitor location register receives the location registration notification response message, and saves the original call smart trigger signed by the calling terminal into its own database .

In the above solution, triggering the corresponding service control point to execute the precise roaming restriction service according to the address of the smart trigger includes: the calling service mobile switching center/visitor location register detects in its own database that the calling terminal has subscribed The intelligent trigger sends an origination request message to the service control point according to the trigger address of the origination intelligent trigger, and triggers the service control point corresponding to the address of the intelligent trigger to execute the precise roaming restriction service.

In the above solution, when the terminal that subscribed to the roaming restriction service is used as the calling party, the instructing the calling service mobile switching center/visitor location register to continue communication is by returning the originating caller to the calling service mobile switching center/visitor location register The request response message is carried out; the said instructing the calling service mobile switching center/visitor location register to refuse communication is carried out by returning the originating call request response message carrying the reason of access rejection to the calling service mobile switching center/visitor location register of.

In the above solution, when the terminal that subscribes to the roaming restriction service is used as the called party, the acquisition of the smart trigger from the home location register to which the terminal that subscribes to the roaming restriction service belongs includes: calling service mobile switching center/visited location The register sends a location request message to the called home location register to obtain the routing information of the called terminal; after receiving the location request message, the called home location register finds that the called terminal has subscribed to the smart trigger, and sends the smart trigger signed by the called terminal to the called terminal. The trigger list is carried in the location request response message and returned to the calling service mobile switching center/visitor location register, and the smart trigger is a final call smart trigger included in the smart trigger list.

In the above scheme, the triggering of the corresponding service control point to execute the precise roaming restriction service according to the address of the smart trigger includes: the calling service mobile switching center/visitor location register is triggered according to the triggering of the terminal smart trigger in the smart trigger list The trigger address sends an information analysis request message to the service control point, triggering the service control point corresponding to the smart trigger address to execute the precise roaming restriction service.

In the above scheme, when the terminal that subscribed to the roaming restriction service is the called party, the instructing the calling service mobile switching center/visitor location register to continue communication is by returning an analysis request to the calling service mobile switching center/visitor location register Responding to the message; the instructing the calling service mobile switching center/visitor location register to reject the communication is carried out by returning an analysis request response message carrying the reason for access rejection to the calling service mobile switching center/visitor location register.

In the above scheme, the service control point described in step B to obtain the location information of the terminal includes: the service control point sends a location request message to the serving mobile positioning center, requesting the location information of the terminal; The location register sends a location request message to request the relevant location information of the terminal; the serving mobile switching center/visitor location register carries the relevant location information of the terminal in the location request response message and returns it to the serving mobile positioning center; the serving mobile positioning center, the positioning entity . The mobile switching center/visitor location register locates the terminal according to the relevant location information of the terminal to obtain the location information of the terminal; the serving mobile positioning center carries the location information of the terminal in the positioning request response message and returns it to the service control point.

In the above solution, before the service control point sends the location request message to the serving mobile positioning center, the service control point further includes: the service control point judges according to the mobile terminal identification of the terminal whether there is a roaming service corresponding to the mobile terminal identification of the terminal in its own database. Restricted range: If yes, the terminal has signed a roaming restriction, and sends a location request message to the serving mobile positioning center; otherwise, the terminal has not signed a roaming restriction, and ends this process.

Therefore, in the precise roaming restriction method provided by the present invention, when the calling terminal initiates a call, the smart trigger is obtained from the HLR to which the terminal that subscribed to the roaming restriction service belongs, and according to the address of the smart trigger, Trigger the corresponding SCP to obtain terminal location information, and judge whether the terminal is within the set roaming restriction range according to the location information, if so, instruct the calling service MSC/VLR to continue communication; otherwise, instruct the calling service MSC/VLR to refuse communication.

Utilizing the present invention, since the operator can set the range of roaming restrictions for terminals that have subscribed to the roaming restriction service, they can set them according to the latitude and longitude, so the problem that the range of roaming restrictions on the terminals is too large is well solved, and accurate terminal Purpose of Roaming Restrictions. In addition, because some positioning methods have nothing to do with the mobile communication network, the roaming restriction on the terminal in the present invention has nothing to do with the MSC/VLR coverage, base station coverage, cell coverage or sector coverage of the terminal in the wireless environment. etc., and is not affected by the planning, optimization or expansion of the mobile communication network where the terminal is located. Therefore, the present invention also reduces the influence caused by the roaming restriction on the terminal due to the change of the wireless environment where the terminal is located.

Description of drawings

Fig. 1 is a method flow chart of the overall technical solution of precise roaming restriction in the present invention;

Fig. 2 is a signaling flowchart of precise roaming restriction in the first embodiment of the present invention;

Fig. 3 is a signaling flowchart of precise roaming restriction in the second embodiment of the present invention;

FIG. 4 is a schematic diagram of a network reference model for location-based services in a code division multiple access communication network system.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the following examples are given and the present invention is further described in detail with reference to the accompanying drawings.

The core content of the present invention is: when the calling terminal initiates a call, obtain the smart trigger from the HLR to which the terminal that has subscribed to the roaming restriction service belongs, and trigger the corresponding SCP to obtain the terminal location according to the address of the smart trigger information, and judge whether the terminal is located within the set roaming restriction range according to the location information, if so, instruct the calling service MSC/VLR to continue communication; otherwise, instruct the calling service MSC/VLR to refuse communication.

As shown in Figure 1, Figure 1 is a method flow chart of the overall technical solution of precise roaming restriction in the present invention, including the following steps:

Step 101: Set a roaming restriction range on the SCP for a terminal that has subscribed to a roaming restriction service, and sign a smart trigger for the terminal on the HLR to which the terminal belongs, wherein the address of the smart trigger is the SCP address;

Step 102: The calling terminal initiates a call, obtains the smart trigger from the HLR to which the terminal subscribed to the roaming restriction service belongs, and triggers the corresponding SCP to execute the precise roaming restriction service according to the address of the smart trigger, wherein the precise roaming Restricted businesses specifically include:

The SCP obtains the location information of the terminal, and judges according to the location information whether the terminal is within the set roaming restriction range, and if so, instructs the calling service MSC/VLR to continue communication; otherwise, instructs the calling service MSC/VLR to refuse communication .

The roaming restriction range of the terminal subscribed to the roaming restriction service can be set by the operator. When an operator sets a roaming restriction range on the SCP for a terminal that has subscribed to the roaming restriction service, it can set the latitude and longitude range that allows the terminal to roam as the terminal's roaming restriction range according to its actual needs.

In addition, when obtaining terminal location information under current technical conditions, the positioning accuracy of the positioning technology used has a certain range of positioning accuracy, which may affect the judgment of whether the terminal is located within the range of the terminal roaming restriction. Therefore, in order to better limit the terminal within the latitude and longitude range desired by the operator, when setting the roaming restriction range of the terminal, the operator can also first set a latitude and longitude range that allows the terminal to roam according to its actual needs, and then according to The positioning accuracy range of the positioning technology used to obtain the terminal location information, the longitude and latitude range covered by the combination of the longitude and latitude range that the operator allows the terminal to roam and the positioning accuracy range of the positioning technology used to obtain the terminal location information, set as the terminal range of roaming restrictions.

For example, if the operator allows the terminal to roam in the range of latitude and longitude between X-Y degrees east longitude and M-N degrees north latitude, and the positioning accuracy range of the positioning technology used to obtain the terminal location information is ±n degrees, then The roaming restriction range of the terminal can be set as the range included between (X-2n)-(Y+2n) degrees east longitude and (M-2n)-(N+2n) degrees north latitude.

The roaming restriction range set by the operator for the terminal is generally stored in the database of the intelligent network system SCP itself. Of course, in order to save the set roaming restriction range, the operator can also use a dedicated database, or use a database shared with other entities, as long as the database used to save the roaming restriction range can interact with the SCP, so that the SCP can determine whether the terminal When it is within the roaming restriction range of the terminal, it only needs to be able to successfully obtain the roaming restriction range set for the terminal.

When storing the roaming restriction range of the terminal, the terminal is generally associated with the roaming restriction range set by the operator for the terminal in the form of a correspondence. In this correspondence, there may be a one-to-one correspondence between the mobile terminal identifier (MSID) of a specific terminal and the roaming restriction range set by the operator for the terminal, or it may be that the MSIDs of all terminals in a certain number range correspond to the range of roaming restrictions set by the operator. The roaming restriction ranges set by all terminals in the number range correspond to each other one by one. The SCP can find the roaming restriction range set by the operator for the terminal in the above correspondence according to the MSID of the terminal.

There are multiple ways to implement the roaming restriction signed by the terminal, and one of the implementation ways may consider that the operator sets the roaming restriction range for the terminal as the terminal has signed the roaming restriction. In this case, when the SCP judges whether the terminal has subscribed to roaming restrictions, it can judge according to the MSID of the terminal whether there is a roaming restriction range corresponding to the MSID of the terminal in its own database: if yes, the terminal has signed the roaming restriction ; Otherwise, the terminal has not subscribed to roaming restrictions.

In addition, the terminal can also implement subscription roaming restriction by means of a subscription flag, and the subscription flag corresponds to the MSID of the terminal, and this correspondence can also be stored in the SCP's own database. Generally, the signing flag is 1, indicating that the terminal has signed a roaming restriction, and the signing flag is 0, indicating that the terminal has not signed a roaming restriction. In this case, when the SCP judges whether the terminal has subscribed to roaming restrictions, it can judge whether the subscription flag corresponding to the MSID of the terminal stored in its own database is 1 according to the MSID of the terminal: if yes, the terminal has subscribed to roaming restrictions; otherwise, the terminal is not subscribed to roaming restrictions.

When subscribing a smart trigger for a terminal on the HLR, for a calling terminal that requires roaming restrictions, it is necessary to sign a smart trigger for the terminal on the calling HLR, and its trigger address is the SCP address. The origination smart trigger can be Origination_Attempt_Authorized, ALL_Calls, or Calling_Routing_ddress_Available. For the called terminal that requires roaming restriction, it is necessary to sign up for the terminal on the called HLR with an intelligent trigger for call termination, and its trigger address is the SCP address. The smart trigger for call termination can be Initial_Termiantion or Advanced_Termination; in addition, for the called terminal, it is also necessary to sign a Location trigger at the called HLR, and the trigger address is the called HLR address.

After triggering the corresponding SCP to execute the precise roaming restriction service, the SCP can use Location Base Service (LBS) to obtain the location information of the terminal, and then realize the monitoring of the terminal according to the obtained terminal location information and the set terminal roaming restriction range. precise roaming restrictions.

In order to describe the precise roaming restriction method provided by the present invention in detail, two specific embodiments will be combined below and described in detail with reference to the accompanying drawings.

As shown in FIG. 2, FIG. 2 is a signaling flowchart of precise roaming restriction in the first embodiment of the present invention. In this embodiment, the terminal is used as the calling party. The operator sets the roaming restriction range on the SCP of the intelligent network system in advance for the calling terminal that has signed the roaming restriction service, and sets the roaming restriction range on the calling HLR for the calling terminal that has signed the roaming restriction service. The smart trigger for signing up and calling out, the smart trigger for calling out for signing up is ALL_Calls, and its trigger address is an SCP address. The method includes the following steps:

Step 201: the calling service MSC/VLR sends a location registration notification (REGNOT) message to the calling HLR to register the location of the calling terminal;

Step 202: The calling HLR receives the REGNOT message, carries the smart trigger ALL_Calls signed by the calling terminal in the regnot response message and returns it to the calling service MSC/VLR;

The calling service MSC/VLR receives the regnot response message, and saves the originating smart trigger ALL_Calls signed by the calling terminal and its trigger address in its own database.

Step 203: The calling terminal calls the called terminal. The calling service MSC/VLR detects in its own database that the calling terminal has subscribed to the originating intelligent trigger ALL_Calls. Send an originating call request (ORREQ) message to trigger the SCP corresponding to the smart trigger address to perform precise roaming restriction services;

In the ORREQ message, TRIGTYPE indicates that the intelligent trigger of the originating call is an ALL_Calls trigger, MSCID indicates the identification of the calling service MSC, and MSID indicates the MIN/IMSI information of the calling terminal.

Step 204: After receiving the ORREQ message, the SCP judges whether the calling terminal has signed a roaming restriction: if yes, then sends a location request (ISPOSREQ) to the serving mobile positioning center (Mobile Position Center, MPC) connected to the calling service MSC/VLR message to request the location information of the calling terminal; otherwise, end this process;

When the SCP judges whether the calling terminal has subscribed to the roaming restriction, the SCP judges whether the roaming restriction range corresponding to the MSID of the terminal is saved in its own database according to the MSID of the calling terminal in the received ORREQ message: if yes, the SCP The calling terminal has subscribed to the roaming restriction; otherwise, the calling terminal has not subscribed to the roaming restriction;

In the ISPOSREQ message sent by the SCP to the serving MPC, the MSID indicates the MIN/IMSI information of the calling terminal, the POSREQTYPE indicates the location request type, the PQOS indicates the positioning accuracy information, and the MSCID indicates the identity of the calling service MSC.

Step 205: the serving MPC sends an ISPOSREQ message to the calling serving MSC/VLR, requesting the relevant location information of the calling terminal;

In the ISPOSREQ message sent by the serving MPC to the calling service MSC/VLR, MSID indicates the MIN/IMSI information of the calling terminal, POSREQTYPE indicates the location request type, PQOS indicates the positioning accuracy information, and LIRAUTH indicates the location information restriction authorization.

Step 206: the calling service MSC/VLR carries the relevant location information of the calling terminal in the isposreq message and returns it to the serving MPC;

In the returned isposreq message, MSCID indicates the identity of the calling service MSC, SCELLID indicates the identity of the serving cell where the calling party is located, MPCAP indicates the mobile positioning capability, and MOBINFO indicates the mobile information.

Step 207: The serving MPC, the Position Determining Entity (PDE), and the calling MSC/VLR locate the calling terminal according to the relevant location information of the calling terminal, and obtain the location information of the calling terminal.

Step 208: The serving MPC returns the location information of the calling terminal to the SCP in an isposreq message.

Step 209: The SCP judges whether the calling terminal is within the terminal roaming restriction range set by the operator according to the acquired location information of the calling terminal and the terminal roaming restriction range set in advance by the operator: The VLR returns an origination request response (orreq) message, instructing the calling service MSC/VLR to continue the call; otherwise, it carries the Access Denied Reason (Access Denied Reason) in the returned orreq message, instructing the calling service MSC/VLR to reject the call ;

After the calling service MSC/VLR receives the orreq message, if it finds that there is AccessDenied Reason in the orreq message, it will interrupt the call; otherwise, the call will continue, and request the called route information from the called HLR according to the called number, and establish a connection with the called service MSC. /VLR calls.

In this way, when the terminal initiates a call as the calling party, the SCP will judge whether the terminal is within the terminal roaming limit set by the operator. If so, the call will continue; otherwise, the call will be rejected and the terminal cannot initiate a call.

As shown in FIG. 3, FIG. 3 is a signaling flowchart of precise roaming restriction in the second embodiment of the present invention. In this embodiment, as the called terminal, the operator sets the roaming restriction range on the SCP of the intelligent network system in advance for the called terminal that has subscribed to the roaming restriction service, and sets the roaming restriction range on the called HLR for the called terminal that has signed the roaming restriction service. Subscribe to the termination intelligent trigger, the contract termination intelligent trigger is Advanced_Termination, and its trigger address is the SCP address; on the called HLR, sign the Location trigger for the called terminal, and its trigger address is the called HLR address, the The method includes the following steps:

Step 301: the calling terminal calls the called terminal, and the calling service MSC/VLR sends a location request (LOCREQ) message to the called HLR to obtain the routing information of the called terminal;

In the LOCREQ message, MSCID indicates the calling service MSC ID, DGTSDIAL indicates the called number, and the calling service MSC/VLR obtains the called HLR address by analyzing the called number, and then sends the LOCREQ message to the called HLR according to the called HLR address; TRIGTYPE indicates that the smart trigger is a Mobile_Termination trigger; the Mobile_Termination trigger does not require a contract, and when the called terminal is a mobile terminal, the smart trigger type is the Mobile_Termination trigger.

Step 302: After receiving the LOCREQ message, the called HLR finds that the called terminal has signed an intelligent trigger, and returns a locreq response message to the calling service MSC/VLR;

In the locreq response message, the trigger address list TRIGADDRLIST indicates that the called terminal has subscribed to the Advanced_Termination trigger and the Location trigger, MSID indicates the MIN/IMSI information of the called terminal, and MSCID indicates the called service MSC identifier.

Step 303: After receiving the locreq response, the calling service MSC/VLR detects the Advanced_Termination trigger in TRIGADDRLIST, and the Advanced_Termination trigger address is the SCP address, then sends an information analysis request (ANLYZD) message to the SCP according to the Advanced_Termination trigger address, Trigger the SCP corresponding to the smart trigger address to perform precise roaming restriction services;

In the ANLYZD message, TRIGTYPE indicates that the trigger is an Advanced_Termination trigger, MSCID indicates the calling service MSC ID, MSID indicates the MIN/IMSI information of the called terminal, DGTSDIAL indicates the called number, and MDN indicates the called directory number.

Step 304: After receiving the ANLYZD message, the SCP judges whether the called terminal has signed a roaming restriction: if yes, then sends an ISPOSREQ message to the serving MPC connected to the called serving MSC/VLR to request the location information of the called terminal; Otherwise, end this process;

When the SCP judges whether the called terminal has subscribed for roaming restrictions, the SCP judges whether the MSID of the called terminal in the received ANLYZD message has a roaming restriction range corresponding to the MSID of the terminal in its own database: if yes, it is The calling terminal has subscribed to the roaming restriction; otherwise, the called terminal has not subscribed to the roaming restriction;

In the ISPOSREQ message sent by the SCP to the serving MPC, the MSID indicates the MIN/IMSI information of the called terminal, the MSCID indicates the called serving MSC identity, the POSREQTYPE indicates the location request type, and the PQOS indicates the location accuracy information.

Step 305: the serving MPC sends an ISPOSREQ message to the called serving MSC/VLR, requesting the relevant location information of the called terminal;

In the ISPOSREQ message sent by the serving MPC to the called serving MSC/VLR, MSID indicates the MIN/IMSI information of the called terminal, POSREQTYPE indicates the location request type, PQOS indicates the positioning accuracy information, and LIRAUTH indicates the location information restriction authorization.

Step 306: The called serving MSC/VLR carries the relevant location information of the called terminal in the isposreq message and returns it to the serving MPC;

In the returned isposreq message, MSCID indicates the identity of the called serving MSC, SCELLID indicates the identity of the called serving cell, MPCAP indicates the mobile positioning capability, and MOBINFO indicates the mobile information.

Step 307: The serving MPC, the PDE, and the called MSC/VLR locate the called terminal according to the related location information of the called terminal, and obtain the called terminal's location information.

Step 308: The serving MPC returns the location information of the called terminal to the SCP in an isposreq message.

Step 309: The SCP judges whether the called terminal is within the terminal roaming restriction range set by the operator according to the acquired location information of the called terminal and the terminal roaming restriction range set in advance by the operator: The VLR returns an Analysis Request Response (anlyzd) message to indicate that the calling service MSC/VLR continues the call; otherwise, the Access Denied Reason is carried in the returned onlyzd message to indicate that the calling service MSC/VLR rejects the call.

Step 310: After receiving the anlyzd message, the calling service MSC/VLR judges whether there is an Access Denied Reason in the anlyzd message: if yes, interrupt the call and end this process; otherwise, execute step 311.

Step 311: The calling service MSC/VLR detects the Location trigger in the TRIGADDRLIST, and the Location trigger address is the called HLR address, then sends a LOCREQ message to the called HLR according to the Location trigger address to obtain the called terminal route information;

In the LOCREQ message, TRIGTYPE indicates that the trigger is a Location trigger, and its trigger address is the called HLR address; MSCID indicates the calling service MSC ID, and DGTSDIAL indicates the called number.

Step 312: The called HLR sends a ROUTREQ message to the called serving MSC/VLR to obtain the called routing information, and the ROUTREQ message includes the called MSCID and called MSID.

Step 313: After receiving the ROUTREQ message, the called service MSC/VLR assigns a roaming number (TLDN) to the called terminal according to the MSCID and MSID therein, and returns the TLDN to the called HLR in the routreq response.

Step 314: The called HLR packs the TLDN into a terminal list (TERMLIST) parameter, and returns it to the calling service MSC/VLR through an lcoreq response message, which also includes the called MSCID and called MSID.

Step 315: The calling serving MSC/VLR establishes a call to the called serving MSC/VLR according to the TLDN in the TERMLIST parameter.

In this way, when the terminal is called, the SCP will also judge whether the terminal is within the roaming limit set by the operator. If so, the call will continue; otherwise, the call will be rejected and the terminal cannot be called.

In the two embodiments of the present invention, after the SCP is triggered to initiate positioning of the target terminal, the SCP uses the LBS to obtain the location information of the terminal. LBS is a service in which the communication network system obtains actual location information such as terminal longitude and latitude, and provides users with practically meaningful geographic location information based on the obtained actual location information. For example, display the actual location information of the terminal on the electronic map, or find out the location information of hotels, hospitals, shopping centers, schools, etc. and phone information to end users.

In order to clearly illustrate the LBS used by the SCP, the following describes the LBS in detail in conjunction with the schematic diagram of the LBS network reference model.

As shown in FIG. 4, FIG. 4 is a schematic diagram of a network reference model of an LBS in a code division multiple access (CDMA) communication network system. LBS introduces network entities such as PDE, MPC and location service application client (Client-Location Service Client, LCS) in the CDMA network. Among them, the main function of the PDE is: when receiving the location request from the MPC, the PDE exchanges information with related equipment such as the MSC, MS, and base station controller (BSC), and uses various measurement information and various data to complete specific operations through specific algorithms. Position calculation, and report the final calculation result to MPC. The MPC is the control management center of the positioning operation processing flow and the control management center of the location information; the LCS is used to receive the positioning request and locate through the MPC.

In the process of using LBS to obtain the actual location information of the terminal, there are mainly the following three implementation methods:

The first is the network-based source cell technology, which acquires the actual location information of the terminal according to the identity of the mobile cellular service cell where the terminal is located.

The second is a trilateration technique based on the principle of Time of Arrival (TOA) or Time Difference of Arrival (TDOA), which obtains the actual location information of the terminal according to the angle and delay of the radio signal between the terminal and one or more base stations .

The third is the Assisted Global Positioning System (A-GPS) technology based on the satellite radio navigation system, which uses the radio signals of GPS satellites for positioning, and then obtains the actual location information of the terminal.

Since the positioning accuracy ranges of each implementation are different, in practical applications, when an operator sets the roaming restriction range of a terminal, it may be adjusted according to the different positioning accuracy ranges of each positioning technology. In addition, in practical applications, other positioning technologies can also be used to obtain the location information of the terminal, as long as the roaming restriction range of the terminal is adjusted accordingly.

In the two embodiments of the present invention, the roaming restriction range set by the operator for the terminal is saved in the database of the intelligent network system SCP itself. In practical applications, in order to save the set roaming restriction range, the operator can also use a dedicated database, or use a database shared with other entities, as long as the database used to save the roaming restriction range can interact with the SCP, so that the SCP can When judging whether the terminal is located within the roaming restriction range of the terminal, it only needs to be able to successfully acquire the roaming restriction range set for the terminal.

In the two embodiments of the present invention, when the SCP judges whether the terminal has signed a roaming restriction, it judges whether the roaming restriction range corresponding to the MSID of the terminal is saved in its own database according to the MSID of the terminal: if it is , the terminal has subscribed to the roaming restriction; otherwise, the terminal has not subscribed to the roaming restriction. In practical applications, there may be multiple ways to implement the roaming restriction signed by the terminal, and judging whether the terminal has signed the roaming restriction may also be different according to different ways of the terminal signed roaming restriction. For example, the terminal can also use a subscription flag to implement subscription roaming restriction. The subscription flag corresponds to the MSID of the terminal, and this correspondence can also be stored in the SCP's own database. In this case, when the SCP judges whether the terminal has subscribed to roaming restrictions, it can judge whether the subscription flag corresponding to the MSID of the terminal stored in its own database is 1 according to the MSID of the terminal: if yes, the terminal has subscribed to roaming restrictions; otherwise, the terminal is not subscribed to roaming restrictions. Such a technical solution is completely consistent with the technical solution provided by the present invention, and should be included within the protection scope of the present invention.

In addition, when the terminal is the calling party, the ALL_Calls trigger is used to sign the terminal on the calling HLR, and its trigger address is the SCP address; when the terminal is called, the Advanced_Termination trigger is used to sign the terminal on the called HLR. Its trigger address is the SCP address. In practical applications, when the terminal acts as the calling party, it is also possible to subscribe the Origination_Attempt_Authorized or Calling_Routing_ddress_Available trigger for the terminal on the calling HLR, both trigger addresses are SCP addresses; when the terminal acts as the called party, it is The terminal signs the Initial_Termiantion trigger, whose trigger address is the SCP address. Such a technical solution is completely consistent with the technical solution provided by the present invention, and should be included within the protection scope of the present invention.

As can be seen from the above embodiments, in the precise roaming restriction method provided by the present invention, when the calling terminal initiates a call, the smart trigger is acquired from the HLR to which the terminal that subscribed to the roaming restriction service belongs, according to The address of the intelligent trigger triggers the corresponding SCP to obtain terminal location information, and judges whether the terminal is within the set roaming restriction range according to the location information, and if so, instructs the calling service MSC/VLR to continue communication; otherwise, instructs The calling service MSC/VLR rejects the communication.

Utilizing the present invention, since the operator can set the range of roaming restrictions for terminals that have subscribed to the roaming restriction service, they can set them according to the latitude and longitude, so the problem that the range of roaming restrictions on the terminals is too large is well solved, and accurate terminal Purpose of Roaming Restrictions. In addition, because some positioning methods have nothing to do with the mobile communication network, the roaming restriction on the terminal in the present invention has nothing to do with the MSC/VLR coverage, base station coverage, cell coverage or sector coverage of the terminal in the wireless environment. etc., and is not affected by the planning, optimization or expansion of the mobile communication network where the terminal is located. Therefore, the present invention also reduces the influence caused by the roaming restriction on the terminal due to the change of the wireless environment where the terminal is located.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. 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 (9)

1. A method for precise roaming restriction, comprising the following steps: A. On the service control point, set the roaming restriction range for the terminal that signed the roaming restriction service, and save the roaming restriction range of the terminal in the service control point of the intelligent network system, or in a dedicated database, or in the service control point in the database shared with other entities, and sign up for the terminal with a smart trigger on the home location register to which the terminal belongs, wherein the address of the smart trigger is the address of the service control point, and the setting of roaming restrictions for the terminal The scope includes: setting the latitude and longitude range that the operator allows the terminal to roam as the roaming restriction range of the terminal, or setting the latitude and longitude range that the operator allows the terminal to roam and the positioning accuracy range of the positioning technology used to obtain the terminal location information The range of latitude and longitude covered by the superposition is set as the roaming restriction range of the terminal; B. The calling terminal initiates a call, obtains the smart trigger from the home location register to which the terminal that subscribed to the roaming restriction service belongs, and triggers the corresponding service control point to execute the precise roaming restriction service according to the address of the smart trigger, wherein , precise roaming restriction services specifically include: The service control point obtains the location information of the terminal, and judges whether the terminal is located within the set roaming restriction range according to the location information, and if so, instructs the calling service mobile switching center/visitor location register to continue communication; otherwise, instructs the calling The serving MSC/VLR rejects the communication. 2. The method according to claim 1, characterized in that, when the terminal that subscribes to the roaming restriction service is the calling party, the smart trigger is obtained from the home location register to which the terminal that has subscribed to the roaming restriction service belongs include: The calling service mobile switching center/visitor location register sends a location registration notification message to the calling home location register, and registers the location of the calling terminal; The calling home location register receives the location registration notification message, and returns the originating smart trigger signed by the calling terminal in the location registration notification response message to the calling service mobile switching center/visitor location register; The calling service mobile switching center/visitor location register receives the location registration notification response message, and saves the origination smart trigger subscribed by the calling terminal into its own database. 3. The method according to claim 2, wherein, according to the address of the smart trigger, triggering the corresponding service control point to execute precise roaming restriction service comprises: The calling service mobile switching center/visitor location register detects in its own database that the calling terminal has subscribed to the originating intelligent trigger, and sends an originating request message to the service control point according to the trigger address of the originating intelligent trigger. The service control point corresponding to the trigger address executes the precise roaming restriction service. 4. The method according to claim 1, characterized in that, when a terminal that has subscribed to the roaming restriction service is used as the calling party, the instructing the calling party to serve the mobile switching center/visitor location register to continue communication is by sending the calling party The serving mobile switching center/visitor location register returns an origination request response message; The said instructing the calling service mobile switching center/visitor location register to reject the communication is carried out by returning an origination request response message carrying the reason of access rejection to the calling service mobile switching center/visitor location register. 5. The method according to claim 1, characterized in that, when the terminal that subscribes to the roaming restriction service is the called party, the smart trigger is acquired from the home location register to which the terminal that subscribes to the roaming restriction service belongs include: The calling service mobile switching center/visitor location register sends a location request message to the called home location register to obtain the routing information of the called terminal; After receiving the location request message, the called home location register finds that the called terminal has subscribed to the smart trigger, and carries the list of smart triggers signed by the called terminal in the location request response message and returns it to the calling service mobile switching center/visitor location register, the smart trigger is an end-call smart trigger included in the smart trigger list. 6. The method according to claim 5, characterized in that, according to the address of the smart trigger, triggering the corresponding service control point to execute the precise roaming restriction service comprises: The calling service mobile switching center/visitor location register sends an information analysis request message to the service control point according to the trigger address of the final call smart trigger in the smart trigger list, and triggers the service control point corresponding to the smart trigger address to perform precise roaming Restrict business. 7. The method according to claim 1, characterized in that, when the terminal that has subscribed to the roaming restriction service is the called party, the instructing the calling service mobile switching center/visitor location register to continue communication is by sending the caller The serving mobile switching center/visitor location register returns an analysis request response message; The said instructing the calling service mobile switching center/visitor location register to reject the communication is carried out by returning an analysis request response message carrying the reason of access rejection to the calling service mobile switching center/visitor location register. 8. The method according to claim 1, characterized in that the acquisition of the location information of the terminal by the service control point in step B includes: The service control point sends a location request message to the serving mobile positioning center to request the location information of the terminal; The serving mobile positioning center sends a location request message to the serving mobile switching center/visitor location register, requesting relevant location information of the terminal; The serving mobile switching center/visitor location register carries the relevant location information of the terminal in the location request response message and returns it to the serving mobile positioning center; The serving mobile positioning center, the positioning entity, and the mobile switching center/visitor location register locate the terminal according to the relevant location information of the terminal, and obtain the location information of the terminal; The serving mobile positioning center carries the location information of the terminal in the positioning request response message and returns it to the service control point. 9. The method according to claim 8, characterized in that before the service control point sends the location request message to the serving mobile positioning center, it further includes: The service control point judges whether the roaming restriction range corresponding to the mobile terminal identifier of the terminal is stored in its own database according to the mobile terminal identifier of the terminal: if yes, the terminal has signed a roaming restriction, and sends a location request message to the serving mobile positioning center; Otherwise, the terminal has not subscribed to the roaming restriction, and this process ends.

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