WO2011150793A1

WO2011150793A1 - Roaming retrying method for mobile terminated short message and system therefor

Info

Publication number: WO2011150793A1
Application number: PCT/CN2011/074867
Authority: WO
Inventors: 杨博; 孔亚洲
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-06-04
Filing date: 2011-05-30
Publication date: 2011-12-08
Also published as: CN102271312A

Abstract

A roaming retrying method for a mobile-terminated short message is provided in the present invention, and the method includes that in the transmission process of a mobile-terminated short message, a called Mobile Station (MS) moves to a new location area and sends a location update request to a new Visitor Mobile Switching Center (VMSC)/Visitor Location Register (VLR); the new VMSC/VLR transfers the location update request to a Home Location Register (HLR), the HLR initiates a location area cancel request to an old VMSC/VLR; after the mobile-terminated short message from the old VMSC/VLR fails to be sent, a Short Message Service Gateway Mobile Switching Center (SMS-GMSC) sends a failure state report through a short message to inform the HLR of mobile-terminated short message transmission failure; and the HLR initiates an alert process for the mobile-terminated short message so as to trigger a Short message Center (SC) to retransmit the mobile-terminated short message. A roaming retrying system for a mobile-terminated short message is also provided in the present invention. With the present invention, the success rate and the timeliness of mobile-terminated short message transmission are enhanced.

Description

Roaming retry method and system for terminating short message

The present invention relates to roaming technology in the field of mobile communications, and in particular, to a roaming retry method and system for terminating short messages. Background technique

The core network of the third generation mobile communication technology (3G, 3rd Generation) is composed of Mobile Switching Center (MSC), Visitor Location Register (VLR), Home Location Register (HLR) and wireless Network controller (RNC, Radio Network Controller). The MSC can be divided into a Gateway Mobile Switching Center (GMSC) and a Visitor Mobile Switching Center (VMSC) according to functions. The GMSC is the MSC responsible for querying the routing information of the called subscriber, and the VMSC is the user. The access MSC is also the destination to which the call is to be routed; the VLR is the visitor location register of the user, the HLR is the home location register of the user, and the RNC is the network element responsible for completing the wireless access function of the user. Short messages are similar to calls. They also need to be routed to determine the destination to which the short message is sent. The gateway responsible for querying short messages is called SMS-GMSC (SMS-Gateway Mobile Switching Center).

The short message sent by the user will be stored by the VMSC to the short message center (SC, Short Message Center) of the user. The SC is a place for storing and forwarding short messages. Since the calling user sends a short message, the called user may be shut down or may not be in the service area. At this time, the SC functions to temporarily store and forward the short message. After receiving the short message, the SC temporarily stores the short message and forwards the short message to the SMS-GMSC. The SMS-GMSC initiates the call to the HLR according to the number of the called user carried in the short message. Short message termination call routing query, HLR will The MSC number (Number) of the VMSC where the called user is currently located is returned to the SMS-GMSC; then the SMS-GMSC routes the terminating short message to the VMSC where the called user is located, and then the VMSC forwards the short message to the called party. Mobile station (MS, Mobile Station).

In the prior art, the process of successfully sending a short-message short message is shown in FIG. 1 , which mainly includes the following steps:

Step 101: The SC forwards the short call message to the SMS-GMSC by sending a short message request. Step 102: The SMS-GMSC sends a short message routing query request to the HLR to query the MSC Number where the called user is currently located.

Step 103: The HLR returns the MSC Number of the called user to the SMS-GMSC through the short message routing query response.

Step 104: The SMS-GMSC forwards the MSC Number obtained by the short message routing query response to the global code (GT, Global Title), and forwards the short message to the VMSC/VLR by sending a short message request message.

Step 105: After completing the check of the short message permission of the called user, the VMSC/VLR initiates a paging request to the called MS.

In step 106, the called MS returns a Paging response to the VMSC/VLR.

Step 107: The VMSC/VLR forwards the short call request message to the called MS by sending a short message request message.

Step 108: The called MS returns a final call short message sending response message to the VMSC/VLR to notify the VMSC/VLR that the short call message is successfully sent.

Step 109: The VMSC/VLR returns a short-message short message sending response message to the SMS-GMSC, and notifies the SMS-GMSC that the short-message short message is successfully sent.

Step 110: The SMS-GMSC returns a sending short message response message to the SC, and notifies the SC short message center that the final call message is successfully sent. After receiving the successful response message, the SC deletes the saved corresponding (ie, successfully sent) terminal call. short message. As can be seen from the above process description, there are two possible movements during the process of sending a short message, and one possibility may be that between steps 103 and 105, the user may move to another VMSC/VLR. Therefore, when the VMSC/VLR receives the short-message short message request sent by the SMS-GMSC, the user data cannot be found, resulting in the failure of the user's absence, generally because the 104 steps are faster, so the possibility is small; another possibility Between step 105 and step 106, during the paging of the called user, the VMSC/VLR moves the called user to the other VMSC/VLR. Since the paging process takes a long time, the high mobility user in this process is very It may move to other VMSC/VLR. This situation will cause paging failure, and it will cause the short message to be sent due to paging failure. This will trigger the short message sending failure process. The process of sending a message failure is shown in Figure 2. It mainly includes the following steps:

Step 201: The SC forwards the terminal short message to the SMS-GMSC by sending a short message request. Step 202: The SMS-GMSC sends a short message routing query request to the HLR to query the MSC Number where the called user is currently located.

Step 203: The HLR returns the MSC Number of the called user to the SMS-GMSC by using a short message routing query response.

Step 204: During the short message routing query by the SMS-GMSC, the called MS moves to the new VMSC/VLR and initiates a location update request to the new VMSC/VLR.

Step 205: After receiving the location update request message initiated by the called MS, the new VMSC/VLR initiates a location update request procedure to the HLR.

Step 206: After receiving the location update request message of the user under the new VMSC/VLR, the HLR initiates a request to cancel the location area to the old VMSC/VLR.

Step 207: After receiving the cancel location area request message, the old VMSC/VLR deletes the data related to the user of the local office, and then returns a cancel location area response message to the HLR.

Step 208: After receiving the cancel location area response message from the old VMSC/VLR, the HLR receives the message A location update success response is returned to the new VMSC/VLR.

Step 209: At this time, the SMS-GMSC performs GT translation by using the MSC Number obtained by the short message routing query response, and forwards the short call short message to the old VMSC/VLR by sending a short message request message.

Step 210: After the old VMSC/VLR receives the short message, since the user may move to the new VMSC/VLR, the terminal call short message that the user is absent may fail at this time; the old VMSC/VLR returns a send message. The short message fails to respond to the SMS-GMSC.

Step 211: The SMS-GMSC needs to send a short message sending status report to the HLR because it needs to be able to trigger a short message alert process after the user is reachable or the memory is cleared after the terminal short message is sent.

Step 212: After receiving the short message sending status report, the HLR records a short message that has failed to be sent. After the user re-accesses or clears the memory, the HLR prepares to notify the corresponding SC to resend the short-call message; after the HLR completes the above action, A short message transmission status report response message is returned to the SMS-GMSC.

Step 213: The SMS-GMSC returns a short message failure response message to the SC; the terminal call short message sending failure process ends.

Another failure of the termination of the short message transmission due to user movement is during the paging period. Since the paging time may be long, the user may move to the new VMSC/VLR, causing the short message to be sent. The flow chart is shown in Figure 3. It mainly includes the following steps:

Step 301: The SC forwards the terminal short message to the SMS-GMSC by sending a short message request. Step 302: The SMS-GMSC sends a short message routing query request to the HLR to query the MSC Number where the called user is currently located.

Step 303: The HLR returns the MSC Number of the called user to the SMS-GMSC through the short message routing query response.

Step 304, the SMS-GMSC uses the MSC Number obtained by the short message routing query response. The GT translation forwards the short call message to the old VMSC/VLR by sending a short message request message. Step 305, at this time, the called MS starts to move to the new VMSC/VLR, and to the new

The VMSC/VLR initiates a location update request.

Step 306: After receiving the terminal short message request message, the old VMSC/VLR starts to initiate a paging request.

Step 307: After receiving the location update request message initiated by the called MS, the new VMSC/VLR initiates a location update request procedure to the HLR.

Step 308: After receiving the location update request message of the user in the new VMSC/VLR, the HLR initiates a request to cancel the location area to the old VMSC/VLR.

Step 309: After receiving the cancel location area request message, the old VMSC/VLR deletes the data related to the user of the local office, and suspends the ongoing paging process, and then returns a cancel location area response message to the HLR.

Step 310: After receiving the cancel location area response message from the old VMSC/VLR, the HLR returns a location update success response to the new VMSC/VLR.

Step 311: After the old VMSC/VLR receives the cancel location area request, the ongoing paging process is suspended; the old VMSC/VLR returns a short message failure response (paging failure) to the SMS-GMSC _0.

Step 312: The SMS-GMSC needs to send a short message sending status report to the HLR because the short message alert process needs to be triggered after the user can reach or the memory is cleared after the failure of the terminal short message transmission.

Step 313: After receiving the short message sending status report, the HLR records a short message that has failed to be sent. After the user re-accesses or clears the memory, the HLR prepares to notify the corresponding SC to resend the short-call message; after the HLR completes the above action, A short message transmission status report response message is returned to the SMS-GMSC.

Step 314, the SMS-GMSC returns a short message failure response message to the SC; The short message sending failure process ends.

It can be seen that the prior art appears that the user moves to other during the process of terminating the short message.

In the case of VMSC/VLR, the terminal short message cannot be initiated in time and effectively. The end-call short message Alert process occurs after the HLR receives the user's location update request, and the HLR checks whether there is a backlog of short message transmission failure records. If so, the SC is notified to resend the short message; since the user is in the new VMSC/VLR When the location update is performed, the current process of terminating the short message has not yet ended. Therefore, the Alert process of the terminal short message is not triggered at this time, and the Alert process of the terminal short message is triggered only when the user initiates the service next time. This will affect the timeliness and success rate of the delivery of short message. Summary of the invention

In view of this, the main object of the present invention is to provide a roaming retry method and system for terminating short messages to improve the success rate and timeliness of terminating short message transmission.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

The present invention provides a roaming retry method for a terminating short message, the method comprising: in a process of sending a short message, the called mobile station (MS) moves to a new location area and visits the new mobile switching center ( VMSC) / Visit Location Register (VLR) sends a location update request;

The new VMSC/VLR forwards the location update request to a Home Location Register (HLR), and the HLR initiates a Cancel Location Area Request to the old VMSC/VLR;

After the sending of the short-message short message on the old VMSC/VLR fails, the sending short message failure response is sent to the short message gateway (SMS-GMSC), and the SMS-GMSC notifies the HLR to terminate the short message by sending a short message sending failure status report. Failed to send;

And the HLR initiates a reminder process of the terminal short message, and triggers the short message center (SC) to resend the terminal short message.

After the sending of the short-message short message on the old VMSC/VLR fails, the return of sending the short message fails. In response to the SMS-GMSC, the SMS-GMSC notifies the HLR that the termination of the short message is sent through the short message sending failure status report, specifically:

Receiving, by the old VMSC/VLR, the canceling location area request sent by the HLR, or receiving the identity authentication request sent by the new VMSC/VLR, returning the sending short message failure response carrying the roaming retry information to the SMS-GMSC;

The SMS-GMSC sends a short message transmission status report carrying the roaming retry information to the HLR.

The roaming retry information is: a roaming retry flag and/or a cause value of the roaming retry.

The method further includes:

The HLR detects a roaming retry of the terminal short message according to the location update procedure initiated by the called MS on the new VMSC/VLR before receiving the status report of the failure of the terminal short message transmission.

After the SMS-GMSC sends the short message sending status report carrying the roaming retry information to the HLR, the method further includes:

The HLR returns a short message transmission status report response to the SMS-GMSC, and initiates a reminder procedure for the terminating short message after the called MS ends the location update process of the new VMSC/VLR.

And the HLR initiates the reminding process of the short call message, and triggers the SC to resend the short call message, specifically:

Sending, by the HLR, a short message reminder to the SC, and informing the SC of the attempt to re-initiate the terminating short message;

The SC resends the short call message after returning the short message alert response to the HLR. The present invention also provides a roaming retry system for terminating short messages, the system comprising: a called MS, a new VMSC/VLR, an old VMSC/VLR, an SMS-GMSC, an HLR, and an SC, where the SC is used Initiating a short message sending process; The called MS is configured to send a location update request to the new VMSC/VLR when moving to a new location area during the sending of the short-message short message;

The new VMSC/VLR, configured to forward the location update request to the HLR;

The HLR is configured to initiate a cancel location area request to the old VMSC/VLR after receiving the location update request, and is further configured to: after being notified by the SMS-GMSC that the terminal short message is sent, the initiator The reminder process of the short message is triggered to trigger the SC to resend the short call message; the old VMSC/VLR is configured to return a short message failure response to the SMS-GMSC after the final call short message fails to be sent;

The SMS-GMSC is configured to notify the HLR that the short message is sent by the short message sending failure status report.

The old VMSC/VLR is further configured to: after receiving the cancel location area request sent by the HLR, or receiving the identity authentication request sent by the new VMSC/VLR, returning the sending short message failure response carrying the roaming retry information to the SMS-GMSC;

Correspondingly, the SMS-GMSC is further configured to send a short message transmission status report carrying the roaming retry information to the HLR.

The HLR is further configured to detect, according to the location update process initiated by the called MS on the new VMSC/VLR, before receiving the status report that the terminal short message transmission fails, detecting that the terminal short message needs to be performed. Roaming retry.

The HLR is further configured to: after receiving the short message sending status report that is sent by the SMS-GMSC and carrying the roaming retry information, return a short message sending status report response to the SMS-GMSC, and determine the Whether the MS is in the location update process of the new VMSC/VLR has ended, and when the determination ends, the reminder process of the terminal short message is initiated.

The HLR is further configured to: send a short message reminder to the SC, and notify the SC to re-initiate the attempt process of the final call short message; Correspondingly, the SC is further configured to: after returning the short message reminding response to the HLR, resending the term short message.

The roaming retry method and system for terminating short message provided by the present invention, the VMSC/VLR receives the cancel location area request message in the process of terminating short message, as a trigger point for initiating the end call short message roaming retry The VMSC/VLR carries a roaming retry indication in the short message sending failure response, notifying the SMS-GMSC to initiate a roaming retry of the terminating short message, and the SMS-GMSC notifies the HLR of the roaming retry indication in the short message sending failure status report. And then the HLR later initiates a short message reminder process, triggering the SC to resend the end call short message.

Compared with the prior art, the present invention can accurately identify the process in which the user has moved during the short message termination process, and then relies on the short message reminder, and triggers the short message reminder again after the final call short message fails to be sent. The purpose of the SMS re-routing retry is achieved. Compared with the prior art, the present invention can improve the transmission success rate of the short message termination call and improve the timeliness of the short message termination call transmission. DRAWINGS

1 is a flow chart of successful sending of a short message in a prior art;

2 is a flow chart 1 of the prior art in which a short message is sent due to a user moving during a short message;

FIG. 3 is a flow chart 2 of the prior art in which the short message is sent due to the user moving during the short message;

FIG. 4 is a flowchart of a roaming retry method for a terminating short message according to an embodiment of the present invention; FIG. 5 is a flowchart of another method for roaming retry of a terminating short message according to an embodiment of the present invention. detailed description

The technical solutions of the present invention are further elaborated below in conjunction with the accompanying drawings and specific embodiments. The roaming retry method of the terminal short message provided by the present invention is as shown in FIG. Includes the following steps:

Step 401: During the sending of the short message, the called MS moves to the new location area and sends a location update request to the new VMSC/VLR.

Step 402: The new VMSC/VLR forwards the location update request to the HLR, and the HLR initiates a cancel location request to the old VMSC/VLR.

Step 403: After the failure to send the short-message short message on the old VMSC/VLR, return a short message failure response to the SMS-GMSC, and the SMS-GMSC notifies the HLR that the short-message short message is sent through the short message sending failure status report.

Step 404: The HLR initiates a reminder process for the short call message, and triggers the SC to resend the short call message.

Further, step 401 further includes the following steps:

Al, the SC forwards the short message to the SMS-GMSC by sending a short message request;

A2. The SMS-GMSC sends a short message routing query request to the HLR to query the current MSC Number of the called user.

A3, the HLR returns the MSC Number of the called user to the SMS-GMSC through the short message routing query response;

A4. The SMS-GMSC forwards the MSC Number obtained by the short message routing query response to the GT, and forwards the short message to the old VMSC/VLR by sending a short message request message.

Further, step 402 further includes the following steps:

B1. After receiving the short message request message sent by the SMS-GMSC, the old VMSC/VLR initiates a paging process for the called user.

B2. During the paging of the called user, the called user may move to the new VMSC/VLR, and then the new VMSC/VLR initiates the location update process to the HLR;

B3. After receiving the location update request initiated by the new VMSC/VLR, the HLR sends a cancel location area request to the old VMSC/VLR. Further, step 403 further includes the following steps:

C1, the old VMSC/VLR receives the cancel location area request sent by the HLR, or receives the sending identity authentication request (Send Identification) request of the new VMSC/VLR, interrupts the ongoing terminal short message sending process, and returns to carry the roaming The sending short message of the retry information fails to respond to the SMS-GMSC;

C2: The SMS-GMSC sends a short message sending status report carrying the roaming retry information to the HLR; the roaming retry information may be a RoamRetry Indication or a roaming retry reason value. Of course, both can be included;

C3. The HLR returns a short message transmission status report response to the SMS-GMSC.

It should be noted that step 403 is a main process of triggering the HLR to perform the short message termination roaming retry. Step 403 may also not notify the GMSC by the old VMSC/VLR, and then notify the HLR to perform the roaming retry of the short message termination call, but Contains the following steps:

After receiving the status report of the terminal short message transmission failure, the HLR receives the location update process initiated by the called MS on the new VMSC/VLR, and then detects that the short message is required to be terminated. Roaming retry.

Further, step 404 specifically includes:

Dl, the HLR sends a short message reminder to the SC, and notifies the SC to re-initiate the attempt to terminate the short message;

D2. After returning the short message reminder response to the HLR, the SC resends the short call short message (ie, retrying the end call short message).

It should be noted that after returning the short message sending status report response carrying the roaming retry information to the SMS-GMSC, the HLR determines whether the user's location update process in the new VMSC/VLR has ended. If not, the waiting is over. A reminder process for initiating a short call message; if it has ended, a reminder process for the end call short message is immediately initiated.

As shown in FIG. 5, a roaming retry party for a preferred terminal short message according to the present invention is provided. The legal process is described, mainly including the following steps:

Step 501: The SC forwards the short call message to the SMS-GMSC by sending a short message request. Step 502: The SMS-GMSC sends a short message routing query request to the HLR to query the MSC Number where the called user is currently located.

Step 503: The HLR returns the MSC Number of the called user to the SMS-GMSC through the short message routing query response.

Step 504: The SMS-GMSC performs GT translation by using the MSC Number obtained by the short message routing query response, and forwards the short call short message to the old VMSC/VLR by sending a short message request message.

Step 505, at this time, the called MS moves to the new VMSC/VLR, and initiates a location update request to the new VMSC/VLR.

Step 506: After receiving the message of the terminal short message request sent by the SMS-GMSC, the old VMSC/VLR starts to initiate the paging request.

Step 507: After receiving the location update request message initiated by the called MS, the new VMSC/VLR initiates a location update request procedure to the HLR.

Step 508: After receiving the location update request message of the user in the new VMSC/VLR, the HLR initiates a request to cancel the location area to the old VMSC/VLR.

Step 509: After receiving the cancel location area request message, the old VMSC/VLR returns a cancel location area response message to the HLR, and cancels all ongoing services of the user on the old VMSC/VLR.

Step 510: After receiving the cancel location area response message from the old VMSC/VLR, the HLR returns a location update success response to the new VMSC/VLR.

Step 511: The old VMSC/VLR is affected by the cancel location request sent by the HLR, and interrupts the ongoing short call process, and returns a short message failure response message.

SMS-GMSC, and carries roaming retry information in the message.

Step 512, the SMS-GMSC sends a short message with a roaming retry message to send a status message. Sent to the HLR.

Step 513: The HLR returns a short message sending status report response message to the SMS-GMSC; the HLR simultaneously determines whether the location update process is completed when the short message sending status of the carrying the retry retry information is received, and if not, the location is The short message alert process is initiated after the update process is completed; if it has ended, the short message alert process is initiated immediately.

Step 514: After receiving the short message sending status report response message, the SMS-GMSC returns a short message failure response to the SC.

Step 515: The HLR sends a short message reminder to the SC after the location update process of the user ends, and notifies the SC to re-initiate the attempt process of the short message termination call.

Step 516, after returning a short message reminder response message to the SMS-GMSC, the SC immediately initiates a short message retry.

As can be seen from the above process, compared with the prior art, the present invention receives the cancel location area request message in the process of terminating the short message, and the VMSC/VLR acts as a trigger point for initiating the end-call short message roaming retry, by the VMSC/ The VLR carries a roaming retry indication in the short message sending failure response, notifying the SMS-GMSC to initiate a roaming retry of the terminating short message, and the SMS-GMSC notifies the HLR of the roaming retry indication in the short message sending failure status report, and then the HLR The process of initiating a short message reminder later triggers the SC to resend the terminating short message. Through the improvement of the terminal short message flow of the present invention, the success rate and timeliness of the terminal short message transmission can be improved.

Corresponding to the roaming retry method of the foregoing short call message, the present invention further provides a roaming retry system for terminating short messages, including: the called MS, the new VMSC/VLR, the old VMSC/VLR, the SMS-GMSC, the HLR And SC. The SC is used to initiate a short message sending process. The called MS is used to send a location update request to the new VMSC/VLR when moving to the new location area during the sending of the short message. The new VMSC/VLR is used to forward the location update request to the HLR. The HLR is configured to initiate a cancel location area request to the old VMSC/VLR after receiving the location update request, and is further configured to: after being notified by the SMS-GMSC that the terminating short message is failed to be sent, The reminder process of calling the short message triggers the SC to resend the short call message. The old VMSC/VLR is used to return a short message failure response to the SMS-GMSC after the failure of the final call short message transmission. The SMS-GMSC is configured to notify the HLR that the short message is sent by the short message sending failure status.

Preferably, the old VMSC/VLR is further configured to: after receiving the cancel location area request sent by the HLR, or receiving the identity authentication request sent by the new VMSC/VLR, returning the sending short message failure response carrying the roaming retry information to the SMS-GMSC; correspondingly, the SMS-GMSC is further configured to send a short message sending status report carrying the roaming retry information to the HLR.

The HLR is further configured to detect, after the status report of the called MS is initiated on the new VMSC/VLR, the roaming retry of the terminal short message is received before receiving the status report of the failure to send the short message.

The HLR is further configured to: after receiving the short message sending status report that is sent by the SMS-GMSC and carrying the roaming retry information, returning the short message sending status report response to the SMS-GMSC, and determining whether the called MS is in the new VMSC/VLR The location update process has ended, and at the end of the judgment, a reminder process for initiating a short message is initiated.

The HLR is further configured to send a short message reminder to the SC to notify the SC of the attempt to re-initiate the terminating short message; correspondingly, the SC is further configured to: after returning the short message alert response to the HLR, resend the terminating short message.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

A method for roaming retry of a short-message short message, characterized in that: the method comprises: moving a called mobile station (MS) to a new location area and moving to a new visited mobile exchange during a short-message short message transmission process The center (VMSC)/visit location register (VLR) sends a location update request;

2. The roaming retry method for a short-message short message according to claim 1, wherein after the failure to send the short-message short message on the old VMSC/VLR, returning a short message failure response to the SMS-GMSC, SMS - The GMSC notifies the HLR that the short message is sent by the short message sending failure status report, specifically:

The roaming retry method of the terminal short message according to claim 2, wherein the roaming retry information is: a roaming retry flag and/or a cause value of the roaming retry.

The roaming retry method of the terminating short message according to claim 1, wherein the method further comprises: The HLR detects a roaming retry of the terminal short message according to the location update procedure initiated by the called MS on the new VMSC/VLR before receiving the status report of the failure of the terminal short message transmission.

5. The roaming retry method for a terminating short message according to claim 2, wherein after the SMS-GMSC sends the short message transmission status report carrying the roaming retry information to the HLR, the method further includes :

The roaming retry method of the terminating short message according to any one of claims 1 to 5, wherein the HLR initiates a reminder process of the terminating short message, and triggers the SC to resend the terminating short message. Specifically:

The SC resends the short call message after returning the short message alert response to the HLR.

A roaming retry system for terminating short messages, the system comprising: a called MS, a new VMSC/VLR, an old VMSC/VLR, an SMS-GMSC, an HLR, and an SC, wherein the SC, Used to initiate a short message sending process;

The called MS is configured to send a location update request to the new VMSC/VLR when moving to a new location area during a short message sending process;

The new VMSC/VLR, configured to forward the location update request to the HLR;

The HLR is configured to initiate a cancel location area request to the old VMSC/VLR after receiving the location update request, and is further configured to: after being notified by the SMS-GMSC that the terminal short message is sent, the initiator The reminder process of the short message is triggered to trigger the SC to resend the short call message; the old VMSC/VLR is configured to send a short message after the final call short message fails to be sent. Failure response to the SMS-GMSC;

8. The roaming retry system for terminating short message according to claim 7, wherein the old VMSC/VLR is further configured to: receive a cancel location area request sent by the HLR, or receive a new VMSC/VLR After the sent identity authentication request, returning a sending short message with the roaming retry information failure response to the SMS-GMSC;

The roaming retry system for terminating short message according to claim 8, wherein the roaming retry information is: a cause value of a roaming retry flag and/or a roaming retry.

The roaming retry system of the terminating short message according to claim 7, wherein the HLR is further configured to: according to the called MS, before receiving the status report that the terminal short message transmission fails The location update process initiated on the new VMSC/VLR detects that a roaming retry of the terminal short message is required.

The roaming retry system of the terminating short message according to claim 8, wherein the HLR is further configured to: send a short message sending status that is sent by the SMS-GMSC and carries the roaming retry information. After the report, returning a short message sending status report response to the SMS-GMSC, and determining whether the called MS has completed the location update process in the new VMSC/VLR, and at the end of the determination, initiating the terminating call short The reminder process of the message.

The roaming retry system of the terminating short message according to any one of claims 7 to 11, wherein the HLR is further configured to send a short message reminder to the SC, and notify the SC to re-initiate the Describe the attempted process of terminating short messages;

Correspondingly, the SC is further configured to: after returning the short message reminding response to the HLR, resending the term short message.