WO2012009875A1

WO2012009875A1 - Method, short message center, home location register and system for achieving short message user roaming between networks

Info

Publication number: WO2012009875A1
Application number: PCT/CN2010/077142
Authority: WO
Inventors: 张道平; 施健; 何磊; 崔新峰; 孙雷
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-07-21
Filing date: 2010-09-20
Publication date: 2012-01-26
Also published as: CA2793043A1; CN101902709B; BR112012023406A2; CA2793043C; CN101902709A

Abstract

A method for achieving short message user roaming between networks is provided in the present invention, wherein a short message center initiates a termination request to a home location register (HLR); the HLR returns the address of the termination mobile switching center (MSC) for responding to the termination request; the short message center determines whether the termination MSC address includes a particular number; when the termination MSC address includes a particular number, the short message center re-initiates a corresponding termination request to the HLR. A short message center, an HLR and a system for achieving the short message user roaming between networks are provided. The short message center inquires whether the termination MSC address returned by the HLR includes a particular number, and then special processing for roaming between networks is performed according to the particular number. Not only is the message delivery between users roaming between networks achieved effectively, but also no additional interface or network element is required, and thereby the present invention reduces the cost greatly compared with the prior art.

Description

Method for realizing roaming between short message users, short message center, HLR and system

The present invention relates to the field of mobile communications, and in particular, to a method for implementing roaming between short message users, a short message center, an HLR, and a system. Background technique

Inter-network roaming is a service set up to provide users with multiple networks and to dilute user network barriers. Users can perform soft handover between different networks of operators through network roaming, so as to make reasonable use of network resources.

With the advent of the 3G era, WCDMA, TDS-CDMA, and CDMA2000 will become mainstream, and various network standards will have their own advantages. Therefore, the optimization of inter-network roaming has become especially important, such as inter-network roaming. Delivery of messages between users.

The short message center is based on the called number segment for routing and forwarding of messages. This delivery forwarding method is based entirely on the ownership relationship between the number segment and the carrier network. However, if the service of roaming between users is supported, the number of the user is always one. When switching between different networks, the user number has no attribution relationship with the network. Therefore, it is not possible to simply forward the short message directly through the number segment.

Based on the above reasons, how to achieve the attribution of the destination user number in this application becomes a key issue. There are two common practices:

1. Add a Routing Number (RN) query message to determine the user's attribution before terminating the call.

This method is similar to the standard number portability mode, and the current attribution of the destination user is judged by the RN. Although the method is very accurate and the process is clear, the RN query message interface needs to be added, and the network element is added to store the correspondence between the user number and the RN. Therefore, it is more suitable for the number portability service of the entire network, and the global user RN information is uniformly managed by the independent network element. But come with a single carrier To say, it is not economical, requires high network transformation costs, and adds maintenance to a network element.

2. Open an account through the SMS center and deliver the message according to the user's network attribution information.

This method actually uses the SMS center to save the user's attribution information. Thus, on the SMS center side, although the attribution to the user is clear, the SMS center is required to additionally maintain a set of user information, and may also need to add an interface to synchronize the SMS center through the Home Location Register (HLR). User Info. Therefore, this method also makes the cost higher.

Therefore, there is an urgent need for a method that can save costs and effectively realize delivery of roaming users between networks. Summary of the invention

The main object of the present invention is to provide a method for realizing roaming between short message users, a short message center, an HLR and a system, which aims to save cost and effectively realize delivery of roaming users between networks.

The present invention provides a method for implementing roaming between short message users, including:

The short message center initiates a call request to the home location register HLR;

Responding to the terminal call request, and returning to the terminating mobile switching center MSC address; the short message center determines that the terminating MSC address includes a special number, and then re-initiating a corresponding terminal call to the HLR according to the special number request.

The HLR responds to the terminal call request and returns a terminating MSC address:

The HLR acquires the terminal call request information according to the terminal call request;

The HLR determines whether the terminal call request information is consistent with the current network location information of the user; if the terminal call request information is consistent with the current network location information of the user, the terminal MSC address including the current location information of the user is returned; the call request information and the current user If the network location information is inconsistent, the terminating MSC address containing the special number is returned.

The short message center re-initiates a call request to the HLR according to the special number: the short message center obtains network information that the terminal call user roams according to the special number; the short message center roams according to the terminal call user Network information, re-initiated to the HLR The corresponding call request.

The HLR is a composite home location register that supports a call request for a plurality of different network interfaces, or a plurality of single home location registers corresponding to a call request that supports a single network interface.

When the HLR is a plurality of single home location registers, the method further comprises: adding a network identity to the terminal call request before the short message center initiates a terminal call request to the HLR home location register.

The present invention further provides a short message center for realizing roaming between short message users, including: a service logic processing module and a signaling processing module;

The service logic processing module is configured to initiate a terminal call request to the home location register HLR; and when the HLR includes a special number in the terminal call mobile switching center MSC address returned by the HLR in response to the terminal call request, according to the special number, The HLR initiates a corresponding final call request.

The service logic processing module re-initiates a corresponding call request to the HLR according to the special number: the service logic processing module acquires network information roamed by the terminating user according to the special number, and according to the network roaming by the terminating user Information, re-initiating a corresponding call request to the HLR.

The service logic processing module is further configured to add a network identifier to the initiated terminal call request. The present invention also provides an HLR for implementing inter-network roaming of a short message user, including: an obtaining module and a response module;

The obtaining module is configured to obtain, according to the terminal call request initiated by the short message center, the terminal call request information;

The response module is configured to determine whether the terminal call request information is consistent with the current network location information of the user; if the terminal call request information is consistent with the current network location information of the user, return a terminal MSC address including the current location information of the user; If the information is inconsistent with the current network location information of the user, the terminal MSC address including the special number is returned, so that the short message center determines that the terminating MSC address contains a special number, and according to the special number, re-initiates the corresponding call request to the HLR. . The HLR is a comprehensive home location register that supports a call request for a plurality of different network interfaces, or a plurality of single home location registers corresponding to a call request that supports a single network interface.

A system for implementing inter-network roaming of a short message user, comprising: a short message center and an HLR; wherein the short message center is configured to initiate a call request to the home location register HLR; and return to the end when the HLR responds to the terminal call request When the mobile exchange center MSC address contains a special number, according to the special number, the corresponding call request is re-initiated to the HLR;

The HLR is configured to respond to the terminal call request initiated by the short message center, and return a terminating MSC address.

Responding to the terminal call request initiated by the short message center, and returning the terminating MSC address, the HLR obtaining the terminal call request information according to the terminal call request initiated by the short message center, determining the terminal call request information and the current network location of the user Whether the information is consistent; if the terminal call request information is consistent with the current network location information of the user, the terminal MSC address including the current location information of the user is returned; if the terminal call request information is inconsistent with the current network location information of the user, the terminal call containing the special number is returned. MSC address.

The invention queries the short message center to check whether the terminal MSC address returned by the HLR contains a special number, thereby performing special processing of inter-network roaming according to the special number. It not only effectively realizes the message delivery between the roaming users of the network, but also does not need to add redundant interfaces or network elements, which greatly saves the cost compared with the prior art. DRAWINGS

1 is a schematic flow chart of an embodiment of a method for implementing roaming between short message users according to the present invention; FIG. 2 is a schematic flowchart of an HLR responding to a call request in a method for implementing inter-network roaming of a short message user according to an embodiment of the present invention;

3 is a schematic diagram of a process for implementing a short message user roaming from a G network to a C network according to the present invention;

4 is a schematic flow chart of another embodiment of a method for implementing inter-network roaming of a short message user according to the present invention; FIG. 5 is a schematic structural diagram of an embodiment of a system for implementing inter-network roaming of a short message user according to the present invention; FIG. 6 is a schematic structural diagram of an HLR according to an embodiment of the present invention for implementing inter-network roaming of a short message user; FIG. 7 is a schematic structural diagram of an embodiment of a short message center for implementing inter-network roaming between short message users according to the present invention. detailed description

It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The invention is applied to the same operator to build multiple networks, and realizes roaming between short message users. The multiple networks respectively support different network types, such as a network support type CDMA network (CDMA95, CDMA2000, etc.), hereinafter referred to as C network; another network supports GSM-like networks (GSM, WCDMA, TDSCDMA, etc.), Hereinafter referred to as the G network. The present invention specifically describes a process of implementing inter-network roaming for short message users by taking a CDMA-like network and a GSM-like network as examples. Of course, and not limited to inter-network roaming between a CDMA-like network and a GSM-like network, the present invention is equally applicable to inter-network roaming between other networks.

1 is a schematic flowchart of an embodiment of a method for implementing inter-network roaming of a short message user. As shown in FIG. 1, the method for implementing roaming between short message users in this embodiment includes:

Step S10: The short message center initiates a call request to the HLR.

The calling user submits the short message to the short message center. After receiving the short message, the short message center initiates a call request to the home location register (HLR) to obtain the routing information of the called user. When the called user belongs to the C network, the short message center initiates a call request of the C network, that is, an SMSREQ request. When the called user belongs to the G network, the short message center initiates a final call request of the G network, that is, an SRI request.

Step Sl l: The HLR responds to the final call request and returns the terminating MSC address.

The HLR can store the location information of the user; when the user experiences inter-network roaming, the roaming information, that is, the current network location information of the user, can also be stored. After receiving the terminal call request initiated by the short message center, the HLR responds to the terminal call request and returns to the terminating mobile switching center (Mobile). Switching Center, MSC ) address. The HLR here is preferably a comprehensive home location register, and supports the routing interface of the C network and the G network.

FIG. 2 is a schematic flowchart of the HLR responding to the final call request in the method for implementing the inter-network roaming of the short message user according to the embodiment of the present invention. As shown in FIG. 2, step S11 further includes:

Step Si l l : The HLR obtains the call request information according to the final call request.

The HLR supports the routing interface of the C network and the G network at the same time, and obtains the terminal call request information according to the routing interface that the short message center initiates the call request. For example, when the SMS center is requested by the C network, the HLR obtains the SMSREQ request information; when the SMS center is initiated by the G network, the HLR obtains the SRI request information.

Step S112: Determine whether the terminal call request information is consistent with the current network location information of the user; if yes, go to step S113; otherwise, go to step S114.

The HLR determines whether the obtained terminal call request information is consistent with the current network location information of the user. For example, it is assumed that the terminal call request obtained by the HLR is an SRI request, and according to the current network location information of the user, that the user originally belongs to the G network and has roamed to the C network, the terminal call request information is determined to be inconsistent with the network location information, and the process proceeds to step S114. . It is assumed that the terminal call request obtained by the HLR is an SRI request, and the user is originally in the G network according to the current network location information of the user, and the terminal call request information is consistent with the network location information, and the process proceeds to step S113.

Step S113: Returning the terminating MSC address including the current location information of the user.

When the called user does not roam, the HLR responds to the call request and returns a terminating MSC address containing the current location information of the user.

Step S114: Return the terminal MSC address including the special number.

When the called user roams, the HLR responds to the call request and returns the terminating MSC address containing the special number. This special number can be a network identifier or a prefix. For example, in this embodiment, the network identifier of the G network is 01, and the network identifier of the C network is 02.

Step S12: The short message center determines whether the terminal MSC address contains a special number; if yes, then Step S13; otherwise, go to step S14.

After receiving the terminating MSC address returned by the HLR, the short message center determines whether the terminal MSC address contains a special number; if yes, the process goes to step S13; otherwise, the process goes to step S14.

Step S13: Re-initiating a corresponding terminal call request to the HLR according to the special number; and returning to step Sl1.

The step S13 further includes:

Step A: Obtain network information of the roaming of the terminating user according to the special number;

The SMS center obtains the network information of the roaming of the terminating user according to the special number returned by the HLR. For example, if the special number in this embodiment is 01, the network information of the terminal call user roaming is G network, that is, the terminal call user roams to the G network; and the special number is 02, the network information of the terminal call user roaming is obtained.

The C network, that is, the terminating user roams to the C network.

Step B: Re-initiating a corresponding call request to the HLR according to the network information roamed by the terminating user.

When the network information roamed by the terminating user is the G network, the SRI request is re-initiated to the HLR; when the network information roamed by the terminating user is the C network, the SMSREQ request is re-initiated to the HLR.

Step S14: Maintain the original terminal call mode to perform the final call.

When the terminating MSC address does not include a special number, it means that the terminating user does not roam to another network, and the short message center keeps the original terminating mode according to the terminating MSC address returned by the HLR. Whether the terminating MSC address returned by the HLR contains a special number, so that special processing of inter-network roaming is performed according to the special number. In this embodiment, not only the message delivery between the roaming users of the network is effectively realized, but also the redundant interface or the network element is not added, which greatly saves the cost compared with the prior art.

3 is a schematic diagram of a process for implementing a short message user roaming from a G network to a C network according to the present invention. As shown in FIG. 3, a user whose called number is 861890000000 is originally attributed to the G network, and when the current network roams to the C network, The final call process is as follows:

a. The SMS Center initiates a G network termination request (that is, an SRI request) to the integrated HLR. The called number is 8618900000001.

b. The integrated HLR responds to the SRI request because the currently called user has roamed to the C network by the G network, so the integrated HLR returns the terminating MSC address containing the special number. For example, add a special number to the called number as the terminating MSC address, which is 028618900000001.

c. The short message center determines whether the terminal MSC address returned by the integrated HLR includes a special number. As a result, the terminating MSC address returned by the integrated HLR includes a special number, and the short message center determines, according to the special number, that the called user has roamed between the networks. To the C network, the SMSHQ termination request is re-initiated to the integrated HLR.

d. The integrated HLR responds to the SMSREQ request and returns a terminating MSC address containing the current location information. Therefore, the short message center successfully terminates the message according to the terminating MSC address including the current location information.

It should be noted that the process of the SMS user roaming from the C network to the G network is consistent with the process of implementing the short message user roaming from the G network to the C network, and details are not described herein.

4 is a schematic flowchart of another embodiment of a method for implementing inter-network roaming of a short message user, which is different from the previous embodiment in that, in the method for implementing roaming between short message users, the HLR is a single home location register, corresponding to A call request that supports a single network interface. For example, the C network HLR supports the SMSREQ request initiated by the SMS center, and the G network HLR supports the SRI request initiated by the SMS center.

When the short message center initiates a call request to the HLR, in addition to selecting the interface type, it also needs to determine the office direction of the HLR. Generally, the SCCP (Signaling Connection Control Part) layer is routed as the terminating subscriber number. Realized. For the integrated HLR, when the inter-network roaming occurs, the two call requests initiated by the SMS center are different, but the office direction is one. For a single HLR, in order to distinguish the office direction of the two-call request, as shown in FIG. 4, the method for implementing the inter-network roaming of the short message user in this embodiment includes the following steps:

Step S20: Add a network identifier to the terminal call request.

Specifically, the network identifier is added before the destination address of the SCCP layer in the terminal call request, so that the HLR supporting the network identifier responds to the terminal call request initiated by the short message center. For example, when the network identifier 01 is added, the office route indicating the call request is the G network HLR. When the network identifier 02 is added, the office route indicating the call request is the C network HLR. Similarly, the corresponding HLR also supports the identification of a call request with a network flag added.

Step S21: The short message center initiates a call request to the HLR.

Step S22: The HLR responds to the call request and returns the terminating MSC address.

Step S23: The short message center determines whether the MSC address includes a special number; if yes, go to step S24; otherwise, go to step S25.

Step S24: Re-initiating a corresponding terminal call request to the HLR according to the special number, and then returning to step S22.

Step S25: Maintain the original terminal call mode to perform the final call.

Step S21, step S22, step S23, step S24, and step S25 are the same as step S10, step S1, step S12, step S13, and step S14 in the foregoing embodiment, and are not described herein again.

The following describes the implementation flow of the inter-network roaming of the short message user in the case where the HLR is a single home location register. Assume that the user whose called number is 8618900000002 originally belongs to the C network, and the current network roams to the G network. The termination process is as follows:

a: The SMS center initiates an SMSREQ request to the HLR. The called number is 8618900000002. After adding the network identifier in the final call request (that is, the SMSREQ request), the destination address of the SCCP layer in the SMSREQ request is 028618900000002.

b: The C network HLR responds to the SMSREQ request because the currently called user has roamed to the G network by the C network, so the C network HLR returns the terminating MSC address containing the special number. If the terminating MSC address returned by the C network HLR contains a special number, the short message center re-initiates the SRI request, and the called number is still 8618900000002, but after adding the network identity in the final call request (ie, the SRI request), the SRI requests the SCCP. The destination address of the layer is 011866900000002.

d: The G network HLR responds to the SRI request and returns the terminating MSC address containing the current location information. Therefore, the short message center successfully terminates the message according to the terminating MSC address including the current location information.

FIG. 5 is a schematic structural diagram of an embodiment of a system for implementing inter-network roaming of a short message user. As shown in FIG. 5, the system for implementing inter-network roaming of a short message user in this embodiment includes: a short message center 100 and an HLR 200;

The short message center 100 is configured to initiate a call request to the home location register HLR 200. The call center 100 is further configured to: when the HLR 200 includes the special number in the MSC address of the terminating mobile switching center returned in response to the terminal call request, re-direct to the HLR 200 according to the special number. Initiating a corresponding terminating call request; when the HLR 200 does not include a special number in the terminating MSC address returned in response to the terminating call request, the original terminating mode is maintained to perform the terminating call;

The HLR 200 is configured to respond to the terminal call request initiated by the short message center 100, and return the terminating MSC address.

The calling user submits the short message to the short message center 100. After receiving the short message, the short message center 100 initiates a call request to the HLR 200 to obtain the routing information of the called user. Then, according to the terminating MSC address returned by the HLR 200, the short message center 100 selects whether to maintain the original terminating mode for the terminating call or to initiate a final call request to the HLR 200 according to the special number.

In this embodiment, the HLR 200 that implements roaming between the SMS users can store the location information of the user. When the user experiences inter-network roaming, the roaming information, that is, the current network location information of the user, can also be stored. After receiving the terminal call request initiated by the short message center 100, the HLR 200 responds to the terminal call request and returns a Mobile Switching Center (Mobile Switching Center) address. FIG. 6 is a schematic structural diagram of an HLR 200 for implementing inter-network roaming of a short message user according to the present invention. As shown in FIG. 6, the HLR 200 for implementing inter-network roaming of a short message user includes: an obtaining module 20 and a response module 21;

The obtaining module 20 is configured to obtain the terminal call request information according to the terminal call request initiated by the short message center 100;

The response module 21 is configured to determine whether the terminal call request information is consistent with the current network location information of the user; if yes, return a terminating MSC address including the current location information of the user; otherwise, return a terminal MSC address including the special number.

The response module 21 of the HLR 200 determines whether the terminal call request information acquired by the obtaining module 20 is consistent with the current network location information of the user. For example, it is assumed that the terminal call request obtained by the obtaining module 20 is an SRI request, and according to the current network location information of the user, it is known that the user originally belongs to the G network and has roamed to the C network, and then the terminal call request information is inconsistent with the network location information, and is returned. The terminating MSC address containing the special number. It is assumed that the terminal call request obtained by the obtaining module 20 is an SRI request, and according to the current network location information of the user, it can be known that the user originally belongs to the G network and is still in the G network, and then the terminal call request information is consistent with the network location information, and the return includes the current user. The location information of the terminating MSC address.

The HLR 200 can be a comprehensive home location register that supports both end-of-call requests for multiple different network interfaces or a single home location register for multiple call requests that support a single network interface.

FIG. 7 is a schematic structural diagram of an embodiment of a short message center for implementing SMS roaming between short message users. As shown in FIG. 7, the short message center 100 for implementing SMS inter-network roaming in this embodiment includes: a service logic processing module 10 and signaling. Processing module 11; wherein

The service logic processing module 10 is configured to initiate a call request to the HLR 200, and is further configured to re-initiate the corresponding end to the HLR 200 according to the special number when the HLR 200 includes the special number in the terminating MSC address returned in response to the terminal call request. Call request The signaling processing module 11 is configured to: when the HLR 200 does not include the special number in the terminating MSC address returned by the HLR 200 in response to the terminal call request, maintain the original terminating mode to perform the terminating call.

Specifically, the service logic processing module re-initiates a corresponding call request to the HLR according to the special number: the service logic processing module acquires network information roamed by the terminating user according to the special number, and according to the terminating user Roaming network information, re-initiating a corresponding call request to the HLR.

The HLR 200 in this embodiment is a comprehensive home location register, and supports end call requests of a plurality of different network interfaces, such as a C network and a G network. The HLR 200 responds to the call request initiated by the service logic processing module 10 to determine whether the terminating user has an inter-network roaming, and returns a terminating MSC address containing the special number; otherwise, returns a terminating MSC address containing the current location information of the user. This special number can be a network ID or prefix. For example, in this embodiment, the network identifier of the G network is 01, and the network identifier of the C network is 02.

The service logic processing module 10 is specifically configured to: obtain network information of the roaming of the terminating user according to the special number, and initiate a call request to the HLR 200 according to the network information of the roaming of the terminating user. For example, if the special number in this embodiment is 01, the network information of the terminal call user roaming is the G network, that is, the terminal call user roams to the G network, and then the SLR request is re-initiated to the HLR 200; The network information that the user roams is the C network, that is, the terminating user roams to the C network, and then the SMSREQ request is re-initiated to the HLR 200.

In this embodiment, the SMS center 100 and the integrated HLR 200 are used to implement the short message delivery of the inter-network roaming, without adding redundant network elements or interfaces, which greatly saves the operator's construction and operation costs. Moreover, in this embodiment, the short message delivery can be completed only through a set of the short message center 100, which not only reduces the cost of network construction and maintenance of the operator, but also makes the short message billing more accurate.

When the short message center 100 initiates a call request to the HLR 200, in addition to selecting the interface type, it is also necessary to determine the office direction of the HLR 200. Generally, the Signaling Connection Control Part (SCCP) layer is used as the terminating subscriber number. Routed implementation. Correct In the integrated HLR200, when the inter-network roaming occurs, the two call requests initiated by the short message center 100 are different, but the office directions are one. For a single HLR 200 corresponding to a call request that supports a single network interface, in order to distinguish the office direction of the two call requests, the SMS center 100 needs to improve accordingly.

Therefore, on the basis of the above embodiments, another embodiment of the short message center for realizing the roaming between the short message users is proposed. The service logic processing module 10 of the short message center 100 that implements the roaming of the short message user network is also used to: add a network identifier in the initiated call request.

Specifically, the short message center 100 adds a network identifier in front of the destination address of the SCCP layer in the terminal call request, so that the HLR 200 supporting the network identifier responds to the terminal call request. For example, when the network identifier 01 is added, the office route indicating the call request is the G network HLR 200. When the network identifier 02 is added, the office route indicating the call request is the network HLR 200. Similarly, the corresponding HLR200 also supports the identification of a call request that adds a network flag. Therefore, by adding a network call end call request, the problem of the office route differentiation initiated by the short message center 100 in the case of a single HLR 200 can be solved.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent flow transformation made by the specification and the drawings of the present invention may be directly or indirectly applied to other related The technical field is equally included in the scope of patent protection of the present invention.

Claims

Claim

A method for implementing roaming between short message users, wherein the method comprises: the short message center initiating a call request to the home location register HLR;

2. The method for implementing inter-network roaming of a short message user according to claim 1, wherein the HLR responds to the terminal call request and returns a terminating MSC address:

The method for implementing the inter-network roaming of the short message user according to claim 1, wherein the short message center re-initiates the final call request to the HLR according to the special number:

The short message center obtains network information that the terminal call user roams according to the special number; the short message center re-initiates a corresponding call request to the HLR according to the network information that the terminal call user roams.

The method for implementing inter-network roaming of a short message user according to any one of claims 1 to 3, wherein the HLR is a comprehensive home location register for supporting a call request of a plurality of different network interfaces, or more A single home location register corresponding to a call request that supports a single network interface.

The method for implementing inter-network roaming of a short message user according to claim 4, wherein when the HLR is a plurality of single home location registers, the method further comprises: the short message center is initiated to the HLR home location register Add a network identifier to the call request before the end call request.

6. A short message center for realizing roaming between short message users, wherein the short message center for roaming between the short message users comprises: a service logic processing module and a signaling processing module; wherein the service logic processing module uses And initiating a final call request to the home location register HLR; and when the HLR includes a special number in the terminal call mobile switching center MSC address returned by the HLR in response to the terminal call request, according to the special number, re-initiating a corresponding terminal call request to the HLR.

The SMS center for implementing the inter-network roaming of the short message user according to claim 6, wherein the service logic processing module re-initiates a corresponding call request to the HLR according to the special number: the service logic processing module Obtaining the network information roamed by the terminating user according to the special number, and re-initiating the corresponding terminal call request to the HLR according to the network information of the terminal calling user roaming.

The SMS center for implementing inter-network roaming of a short message user according to claim 6 or 7, wherein the service logic processing module is further configured to add a network identifier to the initiated terminal call request.

An HLR for implementing inter-network roaming between short message users, wherein the HLR for implementing inter-network roaming of the short message user comprises: an obtaining module and a response module;

The response module is configured to determine whether the terminal call request information is consistent with the current network location information of the user; if the terminal call request information is consistent with the current network location information of the user, return a terminal MSC address including the current location information of the user; If the information is inconsistent with the current network location information of the user, the terminal MSC address including the special number is returned, so that the short message center determines that the terminating MSC address contains a special number, and according to the special number, re-initiates the corresponding call request to the HLR. .

The HLR for implementing inter-network roaming of a short message user according to claim 9, wherein the HLR is a comprehensive home location register for supporting a call request of a plurality of different network interfaces, or multiple corresponding supporting a single network. A single home location register for the interface's termination request.

11. A system for implementing inter-network roaming of a short message user, wherein the system comprises: a short message center and an HLR; wherein

The short message center is configured to initiate a terminal call request to the home location register HLR; and when the HLR responds to the terminal call request and the terminal call mobile switching center MSC address includes a special number, according to the special number, re-initiated to the HLR Corresponding termination request;

12. The system for implementing inter-network roaming of a short message user according to claim 11, wherein the HLR responds to a call request initiated by the short message center, and returns a terminating MSC address to the HLR according to the short message. The terminal-initiated call request obtains the terminal call request information, and determines whether the terminal call request information is consistent with the current network location information of the user. If the terminal call request information is consistent with the current network location information of the user, the terminal MSC that includes the current location information of the user is returned. Address; If the terminal call request information is inconsistent with the current network location information of the user, the terminal MSC address including the special number is returned.