CN102469424A

CN102469424A - Method and system for processing later forwarding services

Info

Publication number: CN102469424A
Application number: CN2010105312552A
Authority: CN
Inventors: 张红霞; 张强; 丁兆明
Original assignee: ZTE Corp
Priority date: 2010-11-03
Filing date: 2010-11-03
Publication date: 2012-05-23
Anticipated expiration: 2030-11-03
Also published as: CN102469424B; WO2012058932A1

Abstract

The invention discloses a method and a system for processing later forwarding services. The method comprises the following steps: when a calling user calls a called user, a gateway mobile switching center (GMSC) makes a first routing to a home location register HLR of the called user; when the called user cannot answer, the GMSC obtains the failure reasons that the called user cannot answer from the releasing messages and makes a second routing to the HLR of the called user according to the failure reasons; and the GMSC receives the forwarding information feedback by the HLR of the called user and transmits the calling made by the calling user to the appointed forwarding users in the forwarding information according to the forwarding information. The session resources can be saved by using the invention.

Description

Changeed processing method and system before evening

Technical field

The present invention relates to the communications field, before a kind of evening, changeed processing method and system.

Background technology

Along with increasing sharply of communication service; The alternative channel that interoffice possibly take place under following situation (supposes that the calling subscriber is the party A-subscriber; The called subscriber is the party B-subscriber, and forwarding subscriber is C user): the party A-subscriber dials the party B-subscriber, and the party B-subscriber is taken place by late preceding the commentaries on classics; When party B-subscriber's visit ground VMSC (Visited Mobile Switching Center, Visited Mobile Switching Center) and C user's visit ground VMSC simultaneously alternative channel can not take place.Change the visit ground VMSC that refers to the party B-subscriber before said evening and receive the forward-shifting service that takes place after IAM (Initial Address Message, the initialization address message) message.

The situation of concrete segmentation is a lot, and scene is exemplified below (being not limited to following scene):

1) party B-subscriber, C user ascription area are identical, and roaming has taken place the party B-subscriber, and the party A-subscriber dials the party B-subscriber, and the party B-subscriber forwarded user C to before evening;

2) party B-subscriber and C user attaching MSC (Mobile Switching Center, mobile switching centre) are identical, and C user roams, not roaming of party B-subscriber, and the party A-subscriber dials the party B-subscriber, and the party B-subscriber forwarded user C to before evening;

3) party B-subscriber is identical with C user attaching MSC, the party B-subscriber all roam with C user and the visit ground VMSC of the two different, the party A-subscriber dials the party B-subscriber, the party B-subscriber forwarded user C to before evening;

4) party B-subscriber is different with C user attaching MSC, and party B-subscriber and C user do not roam, and the party A-subscriber dials the party B-subscriber, and the party B-subscriber forwarded user C to before evening;

5) party B-subscriber is different with C user attaching MSC, the party B-subscriber all roam with C user and the visit ground VMSC of the two different, the party A-subscriber dials the party B-subscriber, the party B-subscriber forwarded user C to before evening;

6) party B-subscriber is different with C user attaching MSC, has user's roaming and the visit of the two ground VMSC different among party B-subscriber and the C user, and the party A-subscriber dials the party B-subscriber, and the party B-subscriber forwarded user C to before evening.

Existing with 6) application scenarios be that example describes, Fig. 1 is for existing ownership place user dials the called subscriber, taking place changeed before evening, the preceding speech channel route sketch map that forwards under the ownership place user situation may further comprise the steps:

The local called subscriber of step 102, calling user dials, the called subscriber roams into other countries or area, and speech channel belongs to end office (EO) by the ownership place calling subscriber and is routed to ownership place calling subscriber/preceding user who forwards to and belongs to province tandem exchange.

Step 104, call proceeding are to the ownership place international gateway;

Step 106, call proceeding are to called roaming place international gateway;

Step 108, call proceeding belong to toll switch to called roaming place roamer;

Step 110, call proceeding belong to end office (EO) to called roaming place roamer;

Step 112, called subscriber take place to change before late, the preceding user who forwards ownership place to, and speech channel belongs to end office (EO) by called roaming place roamer and is routed to called roaming place roamer and belongs to toll switch;

Step 114, calling belong to toll switch by called roaming place roamer and are routed to called roaming place international gateway;

Step 116, call proceeding are to the ownership place international gateway;

Step 118, call proceeding belong to province tandem exchange to the user who before forwards to;

Step 120, call proceeding belong to end office (EO) to the user who before forwards to.

Can find out that step 102 was to having formed alternative channel between the step 120 during speech channel continued.

Mentioned a kind of routing optimization method in the prior art, as shown in Figure 2, be convenient signal; In Fig. 2, the GMSC of visited network that the calling subscriber is positioned at (Gateway Mobile Switching Center, GMSC) just representes with GMSC; Called subscriber's HLR (Home Location Register; Attaching position register) be expressed as HLRB, the VLR of called subscriber roaming place is expressed as VLRB, and called subscriber roaming place VMSC is expressed as VMSCB; Forwarding subscriber place VMSC is expressed as VMSCC, comprising:

Step 202, the local called subscriber of calling user dials, the called subscriber roams into other countries, and GMSC sends route request information to HLRB, wherein carries preferred route related information;

Step 204, HLRB send PRN (Provide Roaming Number, the request of Providing Roaming Number) message to VLRB, wherein carry preferred route related information;

Step 206, VLRB return PRN ACK (Provide Roaming Number Acknowledge, confirmation Provides Roaming Number) message to HLRB, wherein carry preferred route related information;

Step 208, HLRB return the route requests acknowledgement message to GMSC, wherein carry preferred route related information;

Step 210, GMSC send IAM message to VMSCB;

Step 212, VMSCB transmit into call request message to its corresponding VLRB;

Step 214, VLRB transmit into call confirmation message to its corresponding VMSCB;

Step 216, VMSCB send to GMSC according to the Redirection Information that obtains and continue call treatment message, and indication GMSC carries out preferred route to be handled;

Step 218, GMSC send route request information request Redirection Information to HLRB after receiving preferred route processing messages;

Step 220, HLRB send the route requests acknowledgement message to GMSC;

Step 222, GMSC judge calling subscriber and forwarding subscriber in same country, then send to former called subscriber roaming place VMSCB and continue the call treatment acknowledgement message;

Step 224, GMSC send release message to former called subscriber roaming place VMSCB;

Step 226, GMSC seek route according to the number that before forwards to, and VMSCC sends IAM message to the forwarding subscriber place.

Fig. 3 may further comprise the steps for adopting the speech channel route sketch map of routing optimization method shown in Figure 2:

Step 302: speech channel belongs to end office (EO) by the ownership place calling subscriber and is routed to ownership place calling subscriber/preceding user who forwards to and belongs to province tandem exchange;

Step 304: call proceeding is to the end office (EO) that before forwards the user place to.

Can find out that from above explanation prior art provides preferred routing function can save speech channel, but need visit ground and ownership place all will support this function; In actual motion; Also support preferred routing function with can not guaranteeing visit, that is to say that prior art is not high about the applicability of the routing optimization method of forwarded calls; In practical application, still can't avoid occurring in the session problem of alternative channel, cause the waste of Session Resources.

Occur alternative channel in the session to avoiding in the prior art, cause the problem of the waste of Session Resources, do not propose effective solution at present as yet.

Summary of the invention

Main purpose of the present invention is changeed processing method and system before being to provide a kind of evening, occurs alternative channel in the session to solve above-mentioned can't avoiding at least, causes the problem of the waste of Session Resources.

According to an aspect of the present invention, providing changeed processing method before a kind of evening, comprising: when the calling subscriber made a call to the called subscriber, GMSC GMSC initiated route for the first time to said called subscriber's attaching position register HLR; When said called subscriber can't reply, said GMSC obtained the failure cause that said called subscriber can't reply from release message, and initiated route for the second time according to said failure cause to said called subscriber's HLR; Said GMSC receives the Redirection Information that said called subscriber's HLR returns, and the forwarding subscriber of appointment in call proceeding to the Redirection Information of said calling subscriber being initiated according to said Redirection Information.

More excellent, the failure cause that said called subscriber can't reply comprises: unreachable, the said called subscriber busy of said called subscriber and said called subscriber's no response.

More excellent; When said called subscriber can't reply, said GMSC obtained the failure cause that said called subscriber can't reply from release message, and initiated route for the second time according to said failure cause to said called subscriber's HLR; Comprise: when said called subscriber's Visited Mobile Switching Center VMSC finds that said called subscriber can't reply; Said called subscriber's VMSC sends said release message to said GMSC, and the indicating call failure is carried release cause in the said release message; Said GMSC sends route request information according to said release cause to called subscriber's HLR, carries said release cause in the said route request information.

More excellent, said release message comprises: ALERTING message or call progress message.

More excellent, when unreachable, the said called subscriber busy of said called subscriber or said called subscriber's no response, said called subscriber's VMSC sends said release message to said GMSC.

More excellent, when said called subscriber is unreachable, do not carry forwarding data in the insertion user data requests message that said called subscriber's VLR sends, wherein, said forwarding data comprises transferred number.

More excellent, said GMSC obtains before the failure cause that said called subscriber can't reply, and comprising: the said called subscriber of said calling user dials, and said GMSC sends route request information to said called subscriber's HLR; Said called subscriber's HLR sends the request PRN message that Provides Roaming Number to said called subscriber's VLR; Said called subscriber's VLR sends to Provide Roaming Number to said called subscriber's HLR and confirms PRN ACK message; Said called subscriber's HLR sends the route requests acknowledgement message to said GMSC; Said GMSC sends initialization address message to said called subscriber's VMSC.

More excellent; GMSC is after called subscriber's HLR initiates the route first time;, before said called subscriber's HLR initiates the route second time, also comprise according to said failure cause: said called subscriber's HLR changes the inquiry sign before carrying in the route acknowledgement message first time.

According to a further aspect in the invention; Change treatment system before be provided a kind of evening; The attaching position register HLR that comprises GMSC GMSC and called subscriber: said GMSC; When being used for said calling subscriber said called subscriber being made a call, initiate route for the first time to said called subscriber's HLR; When said called subscriber can't reply, from release message, obtain the failure cause that said called subscriber can't reply, and initiate route for the second time to said called subscriber's HLR according to said failure cause; Receive the Redirection Information that said called subscriber's HLR returns, and the forwarding subscriber of appointment in call proceeding to the Redirection Information of said calling subscriber being initiated according to said Redirection Information; Said called subscriber's HLR is used for said Redirection Information being sent to said GMSC in the second time during route.

More excellent; The Visited Mobile Switching Center VMSC that also comprises said called subscriber: said called subscriber's VMSC, when being used to find that said called subscriber can't reply, send said release message to said GMSC; The indicating call failure is carried release cause in the said release message; Said GMSC is further used for sending route request information according to said release cause to called subscriber's HLR, carries said release cause in the said route request information.

More excellent, said GMSC is further used for when the said called subscriber of said calling user dials, sends route request information to said called subscriber's HLR; VMSC to said called subscriber sends initialization address message; Said called subscriber's HLR is further used for sending the request PRN message that Provides Roaming Number to said called subscriber's VLR; Send the route requests acknowledgement message to said GMSC; Said called subscriber's VLR is further used for sending the confirmation PRN ACK message that Provides Roaming Number to said called subscriber's HLR.

In embodiments of the present invention, the switch that does not need the called subscriber to visit ground is done any special processing, make speech channel the calling subscriber and before forward between the user and directly continue, the visit ground VMSC that need not pass through the called subscriber is circuitous, can save traffic resource.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:

Fig. 1 is the local called subscriber of the calling user dials of prior art, and the called subscriber is taken place by late preceding the commentaries on classics, the preceding speech channel route sketch map that forwards under the forwarding subscriber situation, and wherein forwarding subscriber and called subscriber's ownership place is identical;

Fig. 2 is the flow chart of prior art about the routing optimization method of Fig. 1 application scenarios;

Fig. 3 is the speech channel route sketch map of prior art about the routing optimization method of Fig. 1 application scenarios;

Fig. 4 is the preceding process chart that changes the route optimisation process method in the evening of the embodiment of the invention;

Fig. 5 is that the GMSC of the embodiment of the invention initiates the flow chart of route for the second time;

Fig. 6 is the process chart that the called subscriber of the embodiment of the invention obtains the roaming address after the renewal;

Fig. 7 is that the user of the embodiment of the invention roams into when not support call is preceding changes the visited network of routing optimality function, and user attaching HLR does not insert the process chart of Redirection Information to the user visiting network;

Fig. 8 is that the GMSC of the embodiment of the invention obtains the failure cause process chart before that the called subscriber can't reply;

Fig. 9 is the preceding flow chart that changes the Signalling exchange of processing method in the evening of the embodiment of the invention;

Figure 10 is the preceding position renewal schematic flow sheet that changes processing method in the evening of the embodiment of the invention;

Figure 11 is the preceding first kind of structural representation that changes treatment system in the evening of the embodiment of the invention;

Figure 12 is the preceding second kind of structural representation that changes treatment system in the evening of the embodiment of the invention;

Figure 13 is preceding the third structural representation that changes treatment system in the evening of the embodiment of the invention.

Embodiment

Hereinafter will and combine embodiment to specify the present invention with reference to accompanying drawing.Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.

Mention existence in the prior art and can't avoid occurring alternative channel in the session, cause the problem of the waste of Session Resources, for solving the problems of the technologies described above, the embodiment of the invention is changeed processing method before be provided a kind of evening, and handling process is as shown in Figure 4, comprising:

When step 402, calling subscriber made a call to the called subscriber, GMSC GMSC initiated route for the first time to called subscriber's attaching position register HLR;

Step 404, when the called subscriber can't reply, GMSC obtains the failure cause that the called subscriber can't reply from release message, and initiates route requests Redirection Information for the second time according to failure cause to called subscriber's HLR;

The Redirection Information that step 406, GMSC reception called subscriber's HLR returns comprises information such as transferred number, and according to the forwarding subscriber of Redirection Information with appointment in call proceeding to the Redirection Information of calling subscriber's initiation.

Further, the precondition of step 404 execution is that HLR changes the inquiry sign before carrying in the route acknowledgement message first time.

In embodiments of the present invention; Even the switch of called subscriber roaming place is not supported the routing optimality function of prior art; Using the embodiment of the invention can be so that speech channel directly continues between calling subscriber and forwarding subscriber; The visit ground VMSC that need not pass through the called subscriber is circuitous, can save traffic resource.

During enforcement, the embodiment of the invention is not only applicable to move dials the mobile subscriber, is applicable to that also fixed-line subscriber dials the mobile subscriber, and the preceding user who forwards to can be that the mobile subscriber also can be a fixed-line subscriber.

During enforcement, the failure cause that the called subscriber can't reply comprises multiple situation, for example, can't paging to the called subscriber,, unreachable, the called subscriber busy of called subscriber, called subscriber's no response or the like, concrete condition depends on actual conditions.

During enforcement, when the called subscriber can't reply, GMSC obtained the failure cause that the called subscriber can't reply, and initiated route for the second time according to failure cause to called subscriber's HLR, and handling process is as shown in Figure 5, comprising:

When step 502, called subscriber's Visited Mobile Switching Center VMSC found that the called subscriber can't reply, called subscriber's VMSC sent release message to GMSC, and release cause is carried in the indicating call failure in the release message;

Step 504, GMSC send route request information according to release cause to called subscriber's HLR, carry release cause in the route request information.

During enforcement, release message can have multiple enforcement means, for example, can adopt ALERTING message or call progress message as release message, can also adopt other message certainly, is not limited in ALERTING message or call progress message.

During enforcement, when the called subscriber is unreachable, do not carry forwarding data in the insertion user data requests message that called subscriber's VLR sends, wherein, forwarding data comprises transferred number.

It is as shown in Figure 6 that the called subscriber obtains the handling process of the visit address after the renewal, comprising:

Step 602, called subscriber's VLR Visitor Location Register VLR sends location update message to called subscriber's HLR;

Step 604, called subscriber's HLR sends to called subscriber's VLR and inserts user data requests message, wherein, inserts in the user data requests message and does not carry Redirection Information;

Step 606, called subscriber's VLR returns to called subscriber's HLR and inserts the user data acknowledgement message;

Step 608, called subscriber's HLR upgrades acknowledgement message to the VLR of called subscriber roaming place home position.

Consider compatibility with prior art Call Forwarding and Call Forwarding routing optimality; When changeing routing optimality before called subscriber's the not support call of visited network; Change before visited network takes place for avoiding calling out directly; Rather than directly return release message, the embodiment of the invention further provides following three kinds of solutions:

Scheme one: the user roams into when not support call is preceding changes the visited network of routing optimality function, and user attaching HLR does not insert Redirection Information to the user visiting network, and handling process is as shown in Figure 7, comprising:

Step 702, user's VLR Visitor Location Register VLR sends location update message to user's HLR;

Step 704, user's HLR sends first to the VLR of user visiting network and inserts user data requests message, wherein, does not carry Redirection Information in first the insertion user data requests message;

Step 706, user's VLR returns to user's HLR and inserts the user data acknowledgement message, carries the whether indication of support call routing optimality function of visited network in the message;

Whether step 708, user's HLR inspection user visiting network support call routing optimality function; If do not support; HLR not in follow-up insertion user data requests message to user visiting network egress access customer Redirection Information; After the download user data were accomplished, HLR upgraded acknowledgement message to the VLR of user roaming place home position.

When implementing, GMSC obtains before the failure cause that the called subscriber can't reply, and is different with the routing optimization method that prior art is mentioned, and carries out operation as shown in Figure 8:

Step 802, calling user dials called subscriber, GMSC sends route request information to called subscriber's HLR, carries the indication information whether GMSC supports to strengthen routing optimality in the message;

Step 804, called subscriber's HLR sends the request PRN message that Provides Roaming Number to the VLR that the called subscriber visits ground;

Step 806, called subscriber's VLR sends to Provide Roaming Number to called subscriber's HLR and confirms PRN ACK message;

Whether step 808, called subscriber's HLR supports enhancing routing optimality function provided by the invention through the inspection of the indication information in route request information GMSC; If GMSC does not support; HLR inserts Redirection Information to called subscriber's visited network, comprises the preceding subscription data that change of user such as transferred number;

Step 810, called subscriber's HLR sends the route requests acknowledgement message to GMSC;

Step 812, GMSC send initialization address message to called subscriber's VMSC.

Further, after step 804, before the step 806, if VLR sends restoring user data request (Restore) to HLR, HLR inserts the method for user data to VLR in the Restore process identical with the method for insertion user data among Fig. 7.

Scheme two: whether the visited network no matter user roams supports the routing optimality function of prior art, and HLR is not without exception to user visiting network egress access customer Redirection Information.

The difference that subsequent voice calls is handled with scheme one is if GMSC supports the enhancing routing optimality function that the embodiment of the invention provides; HLR needs further to check whether the user visiting network supports the routing optimality function of prior art; If the routing optimality function of user visiting network support prior art; HLR need be to user visiting network egress access customer Redirection Information, and is preferential with the routing optimality function that guarantees prior art.

Further, the user visiting network carries the indication of whether supporting the routing optimality function in PRN ACK response message, and whether HLR supports the routing optimality function of prior art according to indication information judges visited network.

Further; If VLR sends restoring user data request (Restore) to HLR in the calling procedure; Whether the visited network no matter user roams supports the routing optimality function of prior art, HLR in the Restore process without exception not to user visiting network egress access customer Redirection Information.

Scheme three: user attaching HLR inserts user's forwarding data information handling the visited network of more normally roaming to the user during new technological process position.

In the subsequent voice calls handling process, the called subscriber belongs to HLR after receiving PRN ACK message, judges whether visited network that whether GMSC supports enhancing routing optimality function of the present invention and user to roam supports the routing optimality function of prior art.If GMSC supports enhancing routing optimality function of the present invention; And whether the visited network that the user roams does not support the routing optimality function of prior art, and HLR is kept at user's forwarding data information among the user visiting network VLR to the visited network deletion subscriber data message deletion that the user roams.

For ease of the routing optimization method that provides with prior art relatively, will adopt the evening that the embodiment of the invention provides at present before the commentaries on classics processing method use the flowcharting similar with Fig. 2, see also Fig. 9:

Step 902, the local called subscriber of calling user dials, the called subscriber roams into other countries, and the GMSC of visited network that the calling subscriber is positioned at sends route request information to called subscriber's HLR;

Step 904, called subscriber's HLR sends PRN message to the VLR that the called subscriber visits ground;

The VLR that step 906, called subscriber visit ground sends PRNACK message to called subscriber's HLR;

Step 908, called subscriber's HLR sends the route requests acknowledgement message to the GMSC of called subscriber's ownership place;

The GMSC of step 910, called subscriber's ownership place visits ground VMSC to the called subscriber and sends initialization address message;

Step 912, called subscriber visit ground VMSC and find called subscriber busy or no-response paging or no response;

Step 914, called subscriber visit ground VMSC and send release message (ALERTING message or call progress message) to the GMSC of its ownership place, the indicating call failure;

The GMSC of step 916, called subscriber's ownership place sends route request information (wherein carrying release cause) according to the release cause in the step 407 to called subscriber's HLR;

Step 918, called subscriber's HLR returns corresponding Redirection Information according to the failure cause that GMSC in the route request information brings to the GMSC that wants route;

The user that step 920, GMSC are indicated call proceeding in the Redirection Information according to the Redirection Information in the HLR route response message.

During enforcement; It is different to change the processing method of mentioning in processing method and the prior art before the evening that the embodiment of the invention provides; Accordingly; Also incomplete same on the charging criterion, the preceding interaction process of changeing the charging criterion in processing method and the existing route optimisation technique in evening that here embodiment of the invention is provided describes, promptly; GMSC judges and carries out the processing of step 920 when current route situation satisfies the charging criterion in the existing route optimisation technique that execution in step 920 still was not that call release is decided in its sole discretion by operator when current route situation did not satisfy the charging criterion in the existing route optimisation technique.

Figure 10 is that schematic flow sheet is upgraded in the position of changeing processing method before the evening of having adopted embodiment of the invention scheme one or scheme two to provide, and may further comprise the steps:

The VLR on step 1002, user visiting ground sends location update request message to user's HLR;

Step 1004, user's HLR does not carry Redirection Information when the VLR on visit ground sends insertion user data requests message;

The VLR on step 1006, visit ground returns to user's HLR and inserts the user data acknowledgement message;

Step 1008, user's HLR upgrades acknowledgement message to the VLR of roaming place home position.

Based on same inventive concept, the embodiment of the invention is changeed treatment system before also be provided a kind of evening, comprises GMSC GMSC 1101 and called subscriber's attaching position register HLR 1102, and structure sees also Figure 11:

GMSC 1101, when being used for the calling subscriber called subscriber being made a call, initiate routes for the first time to called subscriber's HLR 1102; When the called subscriber can't reply, obtain the failure cause that the called subscriber can't reply, and initiate route for the second time to called subscriber's HLR1102 according to failure cause; The Redirection Information that reception called subscriber's HLR 1102 returns, and according to the forwarding subscriber of Redirection Information with appointment in call proceeding to the Redirection Information of calling subscriber's initiation;

Called subscriber's HLR 1102 is used for Redirection Information being sent to GMSC 1101 in the second time during route.

In one embodiment, see also Figure 12, changeed the Visited Mobile Switching Center VMSC 1201 that treatment system also comprises the called subscriber before evening:

Called subscriber's VMSC 1201 when being used to find that the called subscriber can't reply, sends release message to GMSC 1101, and release cause is carried in the indicating call failure in the release message;

GMSC 1101, are further used for sending route request information according to release cause to called subscriber's HLR 1002, carry release cause in the route request information.

In one embodiment, called subscriber's HLR 1102 is further used for: obtain the visit address after the called subscriber upgrades.

In one embodiment, see also Figure 13, changeed the VLR Visitor Location Register VLR 1301 that treatment system also comprises the called subscriber before evening:

Called subscriber's VLR 1301 is used for sending location update message to called subscriber's HLR 1102; And, when receiving the insertion user data requests message that called subscriber's HLR 1102 sends, return to called subscriber's HLR 1102 and to insert the user data acknowledgement message;

Called subscriber's HLR 1102 is further used for sending insertion user data requests message to called subscriber's VLR 1301, wherein, inserts in the user data requests message and does not carry Redirection Information; After receiving insertion user data acknowledgement message, upgrade acknowledgement message to called subscriber's VLR 1301 home positions.

In one embodiment, GMSC is further used for when the calling user dials called subscriber, sends route request information to called subscriber's HLR 1102; VMSC 1301 to the called subscriber roaming place sends initialization address message;

Called subscriber's HLR 1102 is further used for sending the request PRN message that Provides Roaming Number to the VLR1201 of called subscriber roaming place; Send the route requests acknowledgement message to GMSC 1101;

Called subscriber's VLR 1301 is further used for sending the confirmation PRN ACK message that Provides Roaming Number to called subscriber's HLR 1102.

From above description, can find out that the present invention has realized following technique effect:

Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the storage device and carry out, and in some cases, can carry out step shown or that describe with the order that is different from here by calculation element; Perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.

The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. changeed processing method before an evening, it is characterized in that, comprising:

When the calling subscriber made a call to the called subscriber, GMSC GMSC initiated route for the first time to said called subscriber's attaching position register HLR;

When said called subscriber can't reply, said GMSC obtained the failure cause that said called subscriber can't reply from release message, and initiated route for the second time according to said failure cause to said called subscriber's HLR;

Said GMSC receives the Redirection Information that said called subscriber's HLR returns, and the forwarding subscriber of appointment in call proceeding to the Redirection Information of said calling subscriber being initiated according to said Redirection Information.

2. method according to claim 1 is characterized in that, the failure cause that said called subscriber can't reply comprises: unreachable, the said called subscriber busy of said called subscriber and said called subscriber's no response.

3. method according to claim 1; It is characterized in that when said called subscriber can't reply, said GMSC obtained the failure cause that said called subscriber can't reply from release message; And initiate route for the second time to said called subscriber's HLR according to said failure cause, comprising:

When said called subscriber's Visited Mobile Switching Center VMSC found that said called subscriber can't reply, said called subscriber's VMSC sent said release message to said GMSC, and the indicating call failure is carried release cause in the said release message;

Said GMSC sends route request information according to said release cause to called subscriber's HLR, carries said release cause in the said route request information.

4. method according to claim 3 is characterized in that, said release message comprises: ALERTING message or call progress message.

5. method according to claim 1 is characterized in that, when unreachable, the said called subscriber busy of said called subscriber or said called subscriber's no response, said called subscriber's VMSC sends said release message to said GMSC.

6. method according to claim 1 is characterized in that, when said called subscriber is unreachable, does not carry forwarding data in the insertion user data requests message that said called subscriber's VLR sends, and wherein, said forwarding data comprises transferred number.

7. according to each described method of claim 1 to 6, it is characterized in that said GMSC obtains before the failure cause that said called subscriber can't reply, and comprising:

The said called subscriber of said calling user dials, said GMSC sends route request information to said called subscriber's HLR;

Said called subscriber's HLR sends the request PRN message that Provides Roaming Number to said called subscriber's VLR;

Said called subscriber's VLR sends to Provide Roaming Number to said called subscriber's HLR and confirms PRN ACK message;

Said called subscriber's HLR sends the route requests acknowledgement message to said GMSC;

Said GMSC sends initialization address message to said called subscriber's VMSC.

8. according to each described method of claim 1 to 6; It is characterized in that; GMSC is after called subscriber's HLR initiates the route first time;, before said called subscriber's HLR initiates the route second time, also comprise according to said failure cause: said called subscriber's HLR changes the inquiry sign before carrying in the route acknowledgement message first time.

9. change treatment system before an evening, it is characterized in that, comprise GMSC GMSC and called subscriber's attaching position register HLR:

Said GMSC when being used for said calling subscriber said called subscriber being made a call, initiates route for the first time to said called subscriber's HLR; When said called subscriber can't reply, from release message, obtain the failure cause that said called subscriber can't reply, and initiate route for the second time to said called subscriber's HLR according to said failure cause; Receive the Redirection Information that said called subscriber's HLR returns, and the forwarding subscriber of appointment in call proceeding to the Redirection Information of said calling subscriber being initiated according to said Redirection Information;

Said called subscriber's HLR is used for said Redirection Information being sent to said GMSC in the second time during route.

10. system according to claim 9 is characterized in that,

The Visited Mobile Switching Center VMSC that also comprises said called subscriber: said called subscriber's VMSC; When being used to find that said called subscriber can't reply; Send said release message to said GMSC, the indicating call failure is carried release cause in the said release message;

Said GMSC is further used for sending route request information according to said release cause to called subscriber's HLR, carries said release cause in the said route request information.

11. according to each described system of claim 9 to 10, it is characterized in that,

The VLR Visitor Location Register VLR that also comprises said called subscriber: said GMSC, be further used for when the said called subscriber of said calling user dials, send route request information to said called subscriber's HLR; VMSC to said called subscriber sends initialization address message;

Said called subscriber's HLR is further used for sending the request PRN message that Provides Roaming Number to said called subscriber's VLR; Send the route requests acknowledgement message to said GMSC;

Said called subscriber's VLR is further used for sending the confirmation PRN ACK message that Provides Roaming Number to said called subscriber's HLR.