WO2008064603A1

WO2008064603A1 - A method and a system for implementing roam cross-network for prepaid users

Info

Publication number: WO2008064603A1
Application number: PCT/CN2007/071098
Authority: WO
Inventors: Shiqian Li; Pu Li
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-11-29
Filing date: 2007-11-20
Publication date: 2008-06-05
Also published as: CN1960576A; CN100479559C

Abstract

The present invention discloses a method for implementing roam cross-network for prepaid users, the method comprises: confirming that the prepaid mobile user has roamed to an external network intercommunicating with the network of its own service provider; modifying the attributes of the prepaid user into a postpaid user; the external network provides cross-network roam service for prepaid user in term of the attributes of the postpaid user. Furthermore, the present invention also provides a system for implementing the cross-network roam of prepaid user. The present invention can implement the cross-network roam service of user by applying the method and system.

Description

Method and system for realizing pre-paid user cross-network roaming

Technical field

The present invention relates to mobile communication technologies, and more particularly to a method and system for implementing pre-paid subscribers to roam across networks. Background of the invention

Prepaid users are low-end users in the traditional concept, and their reputation is not high. They must use the service after paying the fee. Therefore, the roaming range of prepaid users is often limited. It is limited to the specific area of the carrier that is contracted by itself. Roaming inside. Even for two interoperable operators, that is, post-paid users signing up to one of the operators can achieve cross-network roaming to another operator, and prepaid users cannot use the inter-network roaming service.

However, with the development of communication technology and the popularity of mobile communication, the prepaid user base is growing. Many users choose to pay prepaid, which is often the advantage of the prepaid service, such as the opening of the account, the convenience of recharge, and so on. Therefore, how to implement the inter-network roaming service of prepaid users is an urgent problem to be solved in the prior art.

However, since the fee settlement of prepaid users is carried out within the intelligent network system, and the differences in the intelligent network standards of various operators are large, private protocols are widely used, or a large number of extensions are made on the basis of standard protocols. Therefore, due to the problem of the interconnection of intelligent network standards between different operators, the problem that the prepaid users cannot achieve inter-network roaming is created. Summary of the invention

In view of this, the embodiment of the present invention provides a method for implementing pre-paid user inter-network roaming, and the method can implement pre-paid users to implement inter-network roaming between networks of interoperable operators. In addition, the embodiment of the present invention further provides a system for implementing pre-paid users to cross-network roaming, and the system can implement pre-paid users to implement inter-network roaming between networks of interoperable operators.

To achieve the above objective, the technical solution of the embodiment of the present invention is implemented as follows: A method for implementing pre-paid user inter-network roaming, the method includes the following steps: determining that a pre-paid user moves to an external device interworking with a carrier network Network; changing the user attribute of the prepaid user to post payment;

The external network provides inter-network roaming services to the prepaid subscribers according to post-paid subscriber attributes.

A system for implementing pre-paid user cross-network roaming, the system comprising:

The home location register HLR is used to determine that the prepaid subscriber moves to the external network interworking with the carrier network, and indicates to the external mobile switching center MSC where the prepaid subscriber is currently located to change the user attribute of the prepaid subscriber to postpaid. ;

The mobile switching center MSC is configured to receive the indication sent by the HLR, and provide the prepaid fee roaming service to the prepaid user.

A method for implementing pre-paid user inter-network roaming is provided by the embodiment of the present invention. The method changes the user attribute of the pre-paid user to post-paid when the pre-paid user moves to the external network interworking with the own operator network. The prepaid user roams the roaming service to the prepaid user according to the user attribute of the postpaid user, and realizes the inter-network roaming service of the prepaid user. In addition, the embodiment of the present invention further provides a system for implementing pre-paid user cross-network roaming. The method and system of the embodiments of the present invention can implement the inter-network roaming service of the user. BRIEF DESCRIPTION OF THE DRAWINGS

1 is a flowchart of a method for implementing pre-paid user cross-network roaming according to a first preferred embodiment of the present invention; 2 is a flow chart of a prepaid subscriber returning to the network according to the first preferred embodiment of the present invention; FIG. 3 is a structural diagram of implementing a cross-network roaming system for a prepaid subscriber according to the first preferred embodiment of the present invention;

4 is a flow chart of a method for implementing pre-paid user cross-network roaming according to a second preferred embodiment of the present invention;

FIG. 5 is a flowchart of a prepaid subscriber returning to the network according to a second preferred embodiment of the present invention; FIG. 6 is a structural diagram of implementing a cross-network roaming system for a prepaid subscriber according to a second preferred embodiment of the present invention. Mode for carrying out the invention

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

When two operators' networks are interoperable, the post-paid users who sign up to one of the operators can implement inter-network roaming services in the networks under the jurisdiction of the two operators, but due to the problem of the interconnection between the two intelligent network standards, Pre-paid users cannot implement inter-network roaming. As a result, pre-paid users cannot implement inter-network roaming services. Therefore, when pre-paid users enter other carrier networks that communicate with their own carrier networks, their user attributes are changed. For paying users, cross-network roaming services can be provided to prepaid users.

In the technical solution provided by the embodiment of the present invention, first, it is determined that the prepaid user moves to an external network interworking with the carrier network where the user is located; and then changes the user attribute of the prepaid user to postpaid; and finally, in the external network. The network entity provides inter-network roaming services to the prepaid subscribers according to post-paid subscriber attributes.

FIG. 1 is a flow chart of a method for implementing pre-paid user cross-network roaming according to a first preferred embodiment of the present invention, and the specific process is as follows:

In step 101, when the prepaid user moves to the external network mobile switching center (MSC), the external network MSC communicates with the carrier network that is contracted by itself, and the prepaid user sends a location update request to the current external network MSC through the mobile station (MS) where it is located. In the description herein, the external network MSC cartridge is referred to as an external network MSC.

In step 102, after receiving the location update request sent by the MS of the current prepaid subscriber, the external network MSC sends a location registration request to the home location register (HLR) subscribed by the prepaid subscriber.

The location registration request carries at least the mobile switching center identification number (MSCID) of the external network MSC and an international mobile subscriber identity (IMSI) for identifying the current prepaid subscriber. Here, the MSCID is a global unified number, according to the MSCID. Uniquely identifies the MSC.

In step 103, after receiving the location registration request, the HLR determines, according to the IMSI carried therein, that the user corresponding to the currently received location registration request is a prepaid user, and determines, according to the MSCID carried therein, the MSC corresponding to the location registration request. The MSC outside the jurisdiction of the carrier, that is, the external network MSC, can determine that the current prepaid subscriber moves to the external network MSC; the HLR sends a roaming negotiation request to the SCP, where at least the IMSI of the prepaid subscriber and the external network MSC are carried. MSCID.

Here, the HLR can also interact with the SCP through the camping system.

In step S104, after receiving the roaming negotiation request sent by the HLR, the SCP determines, according to the current account balance of the current prepaid user and/or the roaming MSC, whether to allow the inter-network roaming service of the current prepaid user in the external network. If allowed, the permission indication is carried in the roaming negotiation response returned to the HLR; otherwise, the rejection indication is carried in the roaming negotiation response returned to the HLR.

Here, the SCP determines whether the prepaid subscriber can roam or not can be determined according to the SCP customized roaming control policy. For example, if the account balance of the prepaid user can support the prepaid user to make the calling call more than 300 minutes in the roaming place, the prepaid user is allowed to cross. The network roaming service; or it may also determine whether the operator of the roaming place has signed a related service with the local operator.

In addition, the SCP can also determine the services that the prepaid user can use based on the current prepaid user's account balance and/or the roaming MSC. For example, cancel the user's wireless Internet service. When the SCP re-determines the service that the current prepaid user can use, the re-determined service is carried in the roaming negotiation response and sent to the HLR where the prepaid user is located. In the authorized service list, the authorized services that are proposed in this embodiment may be: voice calling, voice called, short message originating, short message terminating, and call forwarding.

In step 105, the HLR receives the roaming negotiation response returned by the SCP, and when the roaming negotiation response carries the permission indication, the HLR cancels the prepaid user in the location registration response of the current prepaid user returned by the external network MSC. The smart trigger address list parameter, the other content in the location registration response is unchanged, such as a service authorization list. If the roaming negotiation response carries the rejection indication, the HLR cancels the user service authorization list in the location registration response of the current prepaid user returned to the roaming MSC, and the other content in the location registration response does not change, for example, carrying the smart Trigger address list parameters, etc., make it impossible for users to use the MS in a roaming network. In a CDMA network, the list of smart trigger addresses is represented in the form of a Trigger Address List.

Here, the HLR makes the prepaid subscriber a postpaid subscriber to the roaming MSC by canceling the smart trigger address list parameter of the prepaid subscriber.

When the SCP further carries the re-determined service that the prepaid user can use in the roaming negotiation response returned to the HLR, the HLR changes the authorized service list (Profile) in the location registration response according to the roaming negotiation response returned by the SCP, and passes the location. The registration response is returned to the external network MSC.

In step 106, the external network MSC returns a location update response to the current prepaid subscriber via the wireless system based on the location registration response returned by the HLR. Here, when the smart trigger address list parameter is not carried in the location registration response returned by the HLR, it indicates that the inter-network roaming service of the prepaid subscriber is allowed. Correspondingly, when the location trigger response does not carry the smart trigger address list parameter, the external network MSC determines that the currently received location registration response corresponds to the post-paid user, and then initiates the current pre-paid user according to the processing procedure of the post-paid user. The various businesses are processed. When there is no service authorization list of the current prepaid user in the location registration response returned by the HLR, it means that the inter-network roaming service of the prepaid user is not allowed. Correspondingly, when the location registration response does not carry the service authorization list of the current prepaid subscriber, the MS will not be able to use various services within the jurisdiction of the external network MSC.

The above describes the process when a prepaid subscriber roams into an external network interworking with its own contracted carrier. The process shown in Figure 2 is used to describe the process in which prepaid users return to their own contracted carrier jurisdiction. For the description of the package, the operator that subscribes the prepaid user is called the local operator, and the network under the jurisdiction of the local operator is called the local network. The specific steps shown in Figure 2 are as follows:

In step 201, when the prepaid subscriber returns to the local network, the MS used by itself sends a location update request to the local MSC where the subscriber is currently located.

In step 202, after receiving the location update request of the MS, the local MSC sends a location registration request to the HLR that the current prepaid subscriber subscribes, at least carrying its own MSCID and the current prepaid subscriber IMSI.

In step 203, the HLR can learn that the prepaid subscriber has returned to the local network from the external network according to the IMSI of the prepaid subscriber and the MSCID of the current local network MSC, and notify the SCP by sending a roaming negotiation request to the SCP. The prepaid user has returned to the website from the external network.

In step 204, the SCP returns a roaming negotiation response to the HLR, informing the HLR to return to restore the prepaid subscriber attribute of the current prepaid subscriber.

In step 205, the HLR returns to the local MSC where the current prepaid subscriber is located. In response to the response, the original smart trigger address list parameter is restored with respect to the location registration response returned by the external network MSC in step 105. If the SCP changes the authorized service of the prepaid subscriber when the prepaid subscriber roams the external network, the HLR restores the original contracted service of the prepaid subscriber in the location registration response returned to the local MSC.

At this time, the HLR restores the user attribute of the prepaid user from post-paid to pre-paid by restoring the original smart trigger address list parameter in the location registration response.

In step 206, the MS receives the location registration response returned by the MSC of the local network, and returns a location update response to the MS where the prepaid subscriber is currently located according to the location registration response.

3 is a system structural diagram of a method for implementing a first preferred embodiment of the present invention, including at least an MS, an MSC, an HLR, and an SCP. The MSC is configured to: when the MS moves to its own jurisdiction, send a location registration request to the home location register HLR that is subscribed by the user to which the MS belongs; and provide an inter-network to the user according to the post-paid user attribute indication returned by the HLR. Roaming business. An HLR, configured to determine, according to the location registration request, whether the user is a prepaid user, a network; when the user is a prepaid user and moves to the external network, sending a roaming negotiation request to the SCP; The result returned by the SCP indicates to the MSC that the user attribute of the prepaid user is postpaid or prepaid. The SCP is configured to determine whether to provide the inter-network roaming service to the pre-paid user according to the pre-paid user and the external network where the pre-paid user is located; and return the determined result to the HLR.

The method for determining, by the HLR, the prepaid user moving to the external network interworking with the operator network that the user subscribes to according to the location registration request, the method for the HLR to indicate to the MSC that the user attribute of the prepaid user is postpaid, and the SCP according to the SCP For the pre-paid user and the external network, the method for determining whether to provide the inter-network roaming service to the pre-paid user can be referred to the related description of the method in the first preferred embodiment, and details are not described herein.

In addition, when the prepaid subscriber returns to the carrier network of his own contract, the HLR will The user attribute of the prepaid user is restored to prepaid.

4 is a flow chart of a method of a second preferred embodiment of the present invention.

In the second preferred embodiment of the present invention, before the inter-network roaming is performed, the pre-paid user applies to the management platform of the operator who has signed the contract in advance, and provides the roaming place to be visited by the operator. The current prepaid user's situation determines whether the user's request is allowed. For a specific method, refer to the determining method of steps 103 to 104 in the first preferred embodiment. At this time, when the operator determines that the current prepaid subscriber does not satisfy the proposed roaming application, the prepaid subscriber may be notified to perform related operations, and the prepaid subscriber has been made to meet the roaming requirement. For example, users are required to top up their own prepaid accounts. When the prepaid subscriber satisfies the roaming requirement, the operator sets inter-network roaming information for the prepaid subscriber, wherein the prepaid subscriber's network allowing inter-network roaming is recorded.

Here, the method for the operator to modify the user subscription information of the HLR subscribed by the current prepaid user may be: adding the inter-network roaming information to the user subscription information of the prepaid user, where the roaming place is recorded and the roaming is performed at the place Authorized business. When the pre-paid user initiates a location update request in the network that allows inter-network roaming, the HLR can directly return the location registration response to the external network MSC according to the record in the roaming information, without having to negotiate with the SCP, thereby reducing the roaming service. The number of times information is exchanged. In addition, due to the needs of some prepaid users' own services, it is necessary to switch between networks of several operators. For example, when conducting transactions between several countries, operators in different countries are generally different. Therefore, prepaid users can also apply for more than one country before roaming as their own network that allows cross-network roaming.

When the pre-paid user performs the location update, the HLR only needs to determine whether the pre-paid user's current external network is recorded according to the inter-network roaming information in the current user subscription information, and if so, according to the corresponding inter-network roaming information. The network MSC returns a location registration response; otherwise, the location update request is rejected, that is, the prepaid user cannot implement the inter-network roaming service. Business.

The specific steps of the process shown in Figure 4 are as follows:

In steps 401 to 402, the specific steps are the same as steps 101 to 102 in the first preferred embodiment, and will not be described in detail herein.

In step 403, the HLR receives the location registration request sent by the external network MSC, and the HLR searches for the network where the external network MSC is located to allow the network to roam across the network, in the inter-network roaming information of the current prepaid subscriber subscription information. If not, the HLR cancels the basic service authorization of the current prepaid user in the location registration response returned by the external network MSC; if yes, the HLR returns the location registration response to the external network MSC according to the record in the inter-network roaming information, including basic The service authorization does not carry the smart trigger address list parameter of the prepaid user.

In step 404, the roaming MSC returns a location update response to the current prepaid subscriber based on the location registration response returned by the HLR.

Here, when the smart trigger address list parameter is not carried in the location registration response returned by the HLR, it indicates that the inter-network roaming service of the prepaid subscriber is allowed. Correspondingly, when the location registration response does not carry the smart trigger address list parameter, the external network MSC determines that the currently received location registration response corresponds to the post-paid user, and then subsequently processes the current pre-paid user according to the post-paid user process. Various services initiated are processed. When there is no service authorization list of the current prepaid user in the location registration response returned by the HLR, it means that the inter-network roaming service of the prepaid user is not allowed. Correspondingly, when the location registration response does not carry the service authorization list of the current prepaid subscriber, the MS will not be able to use various services within the jurisdiction of the external network MSC.

Figure 5 is a diagram showing the process in which a prepaid subscriber corresponding to the second preferred embodiment of the present invention returns to the jurisdiction of his own contracted operator. Specifically:

In the steps 501 to 502, the specific implementation is the same as the steps 201 to 202 in the first preferred embodiment, and will not be described in detail herein. In step 503, the HLR can learn that the prepaid subscriber has returned to the network from the external network according to the IMSI of the prepaid subscriber and the MSCID of the MSC where the subscriber is located, and then restore the current prepaid in the returned location registration response. The user's prepaid user attribute, that is, the original smart trigger address list parameter is restored; and when the prepaid user's authorized service is changed, the HLR resumes the prepaid in the location registration response returned to the local network MSC this time. The fee is the original contracted business of the user.

In step 504, the MS receives the location registration response returned by the local MSC, and returns a location update response to the MS where the prepaid subscriber is currently located according to the location registration response.

FIG. 6 is a structural diagram of a system for implementing a method according to a second preferred embodiment of the present invention. The system includes: an MS, an MSC, and an HLR. The MSC is configured to: when the mobile station MS moves to its own jurisdiction, send a location registration request to the HLR that is subscribed by the user to which the MS belongs; and provide the user with the inter-network roaming service according to the indication of the post-paid user attribute of the HLR. An HLR, configured to determine, according to the location registration request, whether the user is a prepaid user, and move to an external network interworking with an operator network that is subscribed to the user; when determining that the user is a prepaid user, and moving to the external In the network, the HLR indicates to the current MSC where the user is located that the user attribute of the user is post-paid. Here, the HLR may further determine, according to the user subscription information of the prepaid user, whether to indicate that the user attribute is changed to post-paid. The specific method is as described in step 403 in the second preferred embodiment, and details are not described herein again. .

In addition, the HLR determines, according to the location registration request, a method for the prepaid user to move to the external network interworking with the operator network that the user subscribes to, and the method for the HLR to indicate to the MSC that the user attribute of the prepaid user is postpaid, as described in the second comparison. A description of the method in the preferred embodiment is not described in detail herein.

When the prepaid user enjoys the inter-network roaming service by using the post-paid user attribute, the prepaid user's charging method is implemented for the prepaid user, and when periodically resolving, the SCP is further deducted from the prepaid user's account.

In the inter-network roaming service, since the pre-paid users adopt the first-use and post-accounting policies, the services used by the pre-paid users can be appropriately controlled to prevent the pre-paid users from being maliciously overdrawn. For example, when the pre-paid user uses the originating call service, the initial call control condition is preset; and the location registration response message returned to the external network MSC by the HLR carries the initial call trigger parameter, and the initial call trigger is set on the external network MSC. Device. When the prepaid subscriber sends a start call service, the external network MSC triggers an originating call to send an origin call request (ORREQ) message to the HLR, and the HLR determines whether the current originating call service satisfies the initial call control condition, and if so, Instructing the external network MSC to tear down the current call; otherwise, instructing the external network MSC to continue to connect, completing subsequent operations.

The initial call control condition here may be that the whitelist policy or blacklist is set by the HLR. Set the number allowed in the whitelist. Only the number currently dialed by the prepaid subscriber is in the whitelist, and the call is allowed to be connected; otherwise, the call is removed. In the blacklist, set the number segment that is not allowed to dial. As long as the number currently dialed by the prepaid user is in the blacklist, the call is removed; otherwise, the connection of the call is allowed.

The method of setting the black and white list specifically can be set according to the specific country or region. For example, if only pre-paid users who cross-network roaming are allowed to dial the numbers of several countries, the international number prefix and country code of these countries can be added to the white list; for example, pre-paid users who restrict cross-network roaming are dialed. When the numbers of several countries are used, the international number prefix and country code of these countries can be added to the blacklist.

The method and system for implementing pre-paid user inter-network roaming provided by the embodiments of the present invention can be widely applied to mobile communication systems such as CDMA and GSM. At the same time, because all countries are in this The method and system provided by the embodiments of the present invention can also be applied to the international roaming service. In addition, since the pre-paid users cannot realize the inter-network roaming service mainly due to the interconnection problem between the operators' intelligent networks, the current research focuses on how to solve the problem of the intelligent network docking. In the embodiment of the present invention, the user attribute of the prepaid user is changed to post-paid, and the inter-network roaming service of the prepaid user is realized, and the complexity of the system and the technical difficulty are reduced.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalents, improvements, etc., which are made within the spirit and principles of the present invention, should be included in the present invention. Within the scope of protection.

Claims

Claim

A method for implementing pre-paid user cross-network roaming, characterized in that the method comprises the following steps:

Determining that the prepaid user moves to an external network interworking with the carrier network of the carrier; changing the user attribute of the prepaid user to postpaid;

2. The method of claim 1 wherein

Determining that the prepaid user moves to the external network comprises: the home location register HLR subscribed by the prepaid user, determining that the user is based on the received location registration request of the prepaid user in the location registration process Prepaid users and move to the external network;

The changing the user attribute of the prepaid user to the post-paid includes: the HLR does not carry the smart trigger address list in the location registration response returned to the external network mobile switching center MSC where the prepaid user is currently located, User attributes changed from prepaid to postpaid.

The method according to claim 2, wherein the determining that the user is a prepaid user and moving to the external network comprises:

Determining, by the HLR, whether the prepaid subscriber moves to the external network according to the user identifier of the user carried in the location registration request and the mobile switching center identifier MSCID of the current MSC, and if yes, determining that the user is Prepaid users and move to the external network.

The method according to claim 2 or 3, wherein the method further comprises: Determining whether the prepaid subscriber moves to the external network interworking with the carrier network in which the prepaid subscriber is located, the HLR sends a roaming negotiation request to the service control point SCP to which the prepaid subscriber subscribes; the SCP determines whether the prepaid subscriber is allowed The inter-network roaming service sends an indication that the user attribute is post-paid to the HLR if the inter-network roaming service of the pre-paid user is allowed.

The method according to claim 4, wherein the roaming negotiation request sent by the HLR to the SCP carries at least the user identifier of the prepaid subscriber and the MSCID of the current MSC;

The determining, by the SCP, whether the inter-network roaming service of the prepaid user is allowed to: obtaining a corresponding account balance according to the user identifier of the prepaid user, and determining whether the account balance satisfies the fee requirement of the external network MSC, if If satisfied, the inter-network roaming service is allowed; otherwise, the inter-network roaming service is not allowed.

The method according to claim 4, wherein when the inter-network roaming service of the prepaid user is allowed, the method further includes:

Updating the authorized service of the prepaid user according to the account balance of the prepaid user and the roaming place, and notifying the HLR of the updated authorized service;

The external network provides an inter-network roaming service to the prepaid user according to the updated authorized service.

The method according to claim 1, 2 or 3, wherein the method further comprises: pre-setting a network for allowing the inter-network roaming for the pre-paid user;

Determining whether the external network where the prepaid user is currently located is a pre-set network that allows inter-network roaming, and when the pre-paid user is currently in the external network as the pre-set network that allows inter-network roaming, the prepaid The user attribute of the fee user is changed to post-paid.

The method according to claim 7, wherein the pre-setting network that allows inter-network roaming comprises: The prepaid user applies for an inter-network roaming service to the management platform of the own contracting operator, and the management platform determines whether to accept the application according to the account balance of the prepaid user and the proposed network for inter-network roaming, when accepting At the time of the application, the management platform sets the inter-network roaming information in the subscription information of the pre-paid user in the HLR signed by the pre-paid user, wherein the network that allows inter-network roaming is recorded.

The method according to claim 8, wherein when accepting the application, the management platform further comprises: updating the prepaid user according to the account balance of the prepaid user and the proposed network of inter-network roaming Authorizing the service and recording it in the inter-network roaming information;

The external network provides the inter-network roaming service to the prepaid subscriber according to the authorized service recorded in the inter-network roaming information.

10. The method according to claim 2 or 3, characterized in that the method further comprises: the HLR setting an initial call control condition; the HLR is carried by a location registration response returned to the external network MSC Calling a trigger parameter, setting an initial call trigger on the external network MSC;

When the prepaid subscriber sends a start call service, the external network MSC sends an origin call request ORREQ message to the HLR according to the detected initial call trigger, and the HLR determines, according to whether the current originating call service satisfies the initial call control condition. If yes, the external network MSC is instructed to tear down the current call; otherwise, the external network MSC is instructed to continue to perform subsequent operations.

11. The method of claim 1, 2 or 3, wherein the method further comprises:

When the prepaid user returns to the carrier network that is contracted by the prepaid user, the HLR signed by the prepaid user restores the user attribute of the prepaid user to prepaid, and the operator network re-subscribes according to the prepaid user attribute. The prepaid user provides a service.

12. A system for implementing pre-paid user inter-network roaming, characterized in that the system comprises:

The home location register HLR is configured to determine, when the prepaid subscriber moves to the external network interworking with the network of the operator in which the prepaid subscriber is located, to change the user attribute of the prepaid subscriber to postpaid to the external mobile switching center MSC where the prepaid subscriber is currently located. ;

The mobile switching center MSC is configured to receive the indication sent by the HLR, and provide the prepaid user with an inter-network roaming service.

The system according to claim 12, wherein the system further comprises: a service control point SCP;

The SCP is configured to receive a roaming negotiation request sent by the HLR, and determine, according to the prepaid user and an external network, whether to provide an inter-network roaming service to the prepaid user; and return a determined result to the HLR. ; among them,

The HLR sends a roaming negotiation request to the SCP for the prepaid user moving to the external network; and according to the result returned by the SCP, indicates the user attribute of the prepaid user to the MSC for the prepaid user that is provided with the inter-network roaming service. Pay for the post.