CN100428825C - Method for recovering service data when service rearrangement / rollback in system of dual attributes - Google Patents
Method for recovering service data when service rearrangement / rollback in system of dual attributes Download PDFInfo
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- CN100428825C CN100428825C CNB2006100084892A CN200610008489A CN100428825C CN 100428825 C CN100428825 C CN 100428825C CN B2006100084892 A CNB2006100084892 A CN B2006100084892A CN 200610008489 A CN200610008489 A CN 200610008489A CN 100428825 C CN100428825 C CN 100428825C
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Abstract
The present invention relates to a method for restoring service data when the service is reversed / returned in a double attribution system, which aims to solve the problem that a steady-state call which is established can not be maintained normally when the service is reversed / returned in the prior art. The present invention has the scheme: in the process of calling, when a soft switch center sends a load bearing operation to a media gateway which is registered to the soft switch center, a corresponding additional message is sent additionally; except for the normal load-bearing operation, the media gateway is also used for storing the received additional message; after the service is reversed / returned to cause the media gateway to be registered to another soft switch center again, a call message including the additional message is reported; the other soft switch center judges whether the current call is a steady-state call or not and carries out the corresponding processing according to the received call message including the additional message, and thereby, the established steady-state call can be maintained normally, and for an unsteady-state call, the MGW and the noumenal resources of an opposite terminal can be released to prevent the resources from being locked.
Description
Technical field
The present invention relates to switching services under the double attaching system or service returning treatment technology in the mobile communications network, more particularly, relate to switching services in a kind of double attaching system/method of recovery business datum when refunding.
Background technology
Continuous development along with mobile communication technology, all introduce carrying and control separated structures at the circuit domain core net of WCDMA and CDMA2000 network, just original mobile switching centre (MSC) has been divided into mobile soft switch center (MSCe) and two equipment of media gateway (MGW).Below for convenience, describe with network and the custom of CDMA2000, but the solution of the present invention is not limited to CDMA2000, is suitable for too in WCDMA and fixed network.
As shown in Figure 1, dual-homed among the present invention is meant that a MGW can meet two MSCe, just is subordinated to two MSCe.These two MSCe can be by active/standby mode work: under the normal operation, MGW can only be registered on one of them MSCe; When this MSCe broke down, MGW would subscribe on another MSCe, and the resource that is continued MGW management for this reason by a back MSCe provides service.
As can be seen from Figure 1, under the normal condition, MGW1 belongs to MSCe1, and MGW2 belongs to MSCe2.Dispose dual-homed after, the MSCe that is equipped with of MGW1 is MSCe2, MGW2 to be equipped with MSCe be MSCe1.So, MSCe1 also disposes the resource of MGW2 except that the resource that disposes MGW1, and MSCe1 does not use the resource of MGW2 under the normal condition.MSCe2 also disposes the resource of MGW1 except that the resource that disposes MGW2, MSCe2 does not use the resource of MGW1 under the normal condition.During operate as normal, MGW1 is registered on the MSCe1, and MGW2 is registered on the MSCe2, and the signaling of transmitting through MGW1 sends on the MSCe1 of its registration, and the signaling of transmitting through MGW2 sends on the MSCe2 of its registration.BSC among Fig. 1 is a base station controller.
When certain reason made that MSCe1 lost efficacy, the MGW that belongs to it can be registered on the MSCe2; Meanwhile, MSCe2 can detect heartbeat and interrupt and the activation related resource, and the work of taking over main MsCe1.Said herein heartbeat is called heartbeat detection usually, and promptly local terminal regularly sends heartbeat message to the opposite end entity, loopback heartbeat response message again after receive the opposite end; Local terminal receives that the heartbeat response message thinks that promptly the opposite end is in normal operating conditions, if can not receive the heartbeat response message of opposite end in a period of time then think that the opposite end is in abnormality.When the MSCe1 that lost efficacy recover normal after, the MGW1 that belongs to it re-registers on the MSCe1, MSCe2 can detect heartbeating recovery and the work that finishes to take over main MSCe1 simultaneously.In said process, for MGW1, MSCe1 is main, and MSCe2 is for being equipped with.Lost efficacy if MSCe2 takes place, then for MGW2, MSCe2 is main, and MSCe1 is for being equipped with
Be equipped with the process that MSCe takes over work when losing efficacy for main MSCe, we are called switching services; The work of normally taking over again of process recover to(for) main MSCe is then to be called service returning.In the switching services and service returning process of prior art, have following subject matter: (for switching services, what take over work is to be equipped with MSCe to the MSCe of (1) adapter work; For service returning, that take over work is main MSCe) on the beared information of calling on MGW do not set up; (2) calling of not set up on the MSCe of adapter work and the signaling annexation of other entity; (3) user profile and other call informations of the calling of not set up on the MSCe of adapter work.Above-mentioned defective can cause follow-up signaling can't normal process, can't normally carry operation, ticket and problem such as lose.
With A mouth message is example, and for the traditional circuit domain structure, the signaling bear between MSC and BSC is on signalling system No.7, and the A message protocol stack as shown in Figure 2.Wherein, MTP is message transfer part (Message Transfer Part), and SCCP is SCCP (Signalling ConnectionControl Part), and A mouth agreement is carried on the SCCP.
After adopting the soft switch structure, control separates with carrying, MSC is divided into two parts, be soft switch MSCe and media gateway MGW, the A message protocol stack of this moment is (also can use other forms of protocol stack, but dual-homed this protocol stack of general employing) as shown in Figure 3, as can be seen from the figure, be the signalling system No.7 of circuit domain between MGW and BSC, the signaling bear between MGW and MSCe is on IP (Internet Protocol, Internet protocol).M2UA wherein is MTP2-User Adaptation Layer (SS7 MTP2-User AdaptationLayer), is used to MTP3 that is in the IP network and the MTP2 that is in network edge that the primitive communication service is provided; SCTP is SCTP (Stream Control Transport Protocol).M2UA mode wherein is equivalent to set up an IP tunnel, and by this IP tunnel, MSCe is as using the local terminal link to use link on MGW.
At A mouth agreement, normal SCCP connection is set up process as shown in Figure 4.
(1) after SCCP A receives the service request of upper-layer service, can distribute the connection reference of oneself, the link information of record upper-layer service, and initiate to connect foundation to opposite end (being SCCP B) and ask (CR), in this request, have the connection reference of A end.
(2) after the B termination receives that request is set up in above-mentioned connection, can distribute the connection reference of oneself, write down the connection reference that A holds, and data are sent to upper-layer service; After receiving the affirmation message of upper-layer service, write down the link information of upper-layer service again, and send to connect confirm (CC), in this affirmations, have the B end and connect reference and hold with A and be connected reference to the A end.
(3) after A, B both sides know that local terminal connection reference is connected reference with the opposite end, connect to set up and finish.
(4) when follow-up upper-layer service will send data, can send out message and give SCCP, wherein have the link information of SCCP; SCCP sends message again to the opposite end, wherein with the connection reference of opposite end; After message is received in the opposite end, with reference to finding the data record of local terminal, and data are sent to the upper-layer service module according to the connection in the message.
After switching services taking place, make to be equipped with MSCe adapter work,,, can finally can carry out abnormal call clearing owing to can not find corresponding connection with reference to causing signaling to handle for subsequent voice calls information from BSC if there is not the signaling link information.
Be example with the trunk side again, in the conventional art, MSC docks general employing ISUP or TUP with PSTN etc.Here be that example describes with TUP, ISUP is similar with it.The TUP signaling bear is on MTP, and its protocol stack as shown in Figure 5.After adopting soft switch, its protocol stack as shown in Figure 6.
When carrying out the TUP junction call, take a TDM circuit and be used for traffic offered, two inter-entity are come this circuit of mark with unique circuit identifier CIC, and the signaling of two inter-entity also is to connect by CIC simultaneously.When making a call, can take a circuit, and professional table number is recorded in the circuit table of CIC correspondence, and send the IAM message of band CIC to the opposite end; After IAM message is received in the opposite end, can take the circuit of CIC correspondence, the distribution service processing list, and the Business Processing table number is recorded in the circuit table of CIC correspondence.Also all have CIC in the follow-up message related to calls,, just can normally carry out call treatment by the business connection table that writes down in the corresponding circuits table.
When switching services takes place, after the feasible MSCe adapter work fully, if there is not the signaling link information, for TUP subsequent voice calls information from the opposite end entity, can be owing to can not find corresponding service connection table or finding wrong business connection table to cause call exception to be taken out stitches.
For solving the problems of the technologies described above, prior art solutions is to allow the call information of backing up in realtime between the active and standby MSCe.Its shortcoming is that backup data quantity is very big, realizes that cost is very high.
Summary of the invention
Above-mentioned defective at prior art, the present invention will solve in the prior art when switching services/when refunding takes place, the stable state of having set up is called out and can not normally be kept, the subsequent voice calls signaling can't correctly be handled, and allows the method for backing up in realtime between the active and standby soft switch center can cause the very high problem of cost.
The technical solution adopted for the present invention to solve the technical problems is: the method that provides switching services in a kind of double attaching system/when refunding to recover business datum, comprising following steps:
(S1) in calling procedure, when soft switch center sends the carrying operational order in the media gateway to its registration, increase the transmission corresponding additional information;
(S2) media gateway is carried operation, and preserves the described additional information that it is received;
(S3) switching services/when refunding, described re-registering media gateway arrives another soft switch center, and reports the call information that has described additional information when taking place;
(S4) described another soft switch center is according to its call information of receiving that comprises described additional information, judge whether current calling is that stable state is called out, if then recover corresponding beared information, signaling link information and user profile according to the call information that comprises described additional information.
In the step (S4) of the method for the invention, be that unstable state is called out if judge current calling, then described soft switch center sends the message of releasing bearing to media gateway, and sends clear message to the opposite end entity.
In the step (S4) of the method for the invention, call out for stable state, also recover its ticket information.
In method of the present invention, at mobile communication system, described additional information can comprise signaling link information and user profile; Comprise in the call information that in described step (S3), reports: the additional information of the additional information of Context, Context, Termination and Termination; In described step (S4), described another soft switch center judges according to the steady state flag in the additional information of Context whether current calling is that stable state is called out.
In the step (S4) of the method for the invention, be that stable state is called out if judge current calling, then:
Come recovering bearing information according to described Context, Termination;
According to the additional information recovery of described Termination and the signaling link information of other entity;
Recover user profile and ticket information according to the additional information of described Context, the additional information of Termination.
In the step (S3) of the method for the invention, adopt the mode of flow control to report described call information.Described flow control mode can be to report according to fixing Context number in the unit interval, reports up to all Context information and finishes; Or mean allocation Context number at the appointed time, evenly report.
Because technique scheme as can be known, among the present invention, owing to preserved corresponding additional information (wherein comprising signaling link information and user profile etc.) in the media gateway, and these information are reported soft switch center can between active and standby soft switch center, switching services or service returning take place the time, allow soft switch center recover corresponding beared information, signaling link information and user profile according to its call information of receiving that comprises described additional information; Thereby make the stable state set up call out and can normally keep, the subsequent voice calls signaling also can correctly be handled, and normal call list.Call out for unstable state, then can discharge the resource of bearing resource, soft switch center and opposite end entity on the MGW, in order to avoid resource from suspending.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the schematic diagram of double attaching system;
Fig. 2 is traditional A mouth protocol of messages stack schematic diagram
Fig. 3 adopts soft switch structure A mouth protocol of messages stack schematic diagram afterwards
Fig. 4 is that the process schematic diagram is set up in the normal SCCP connection of A mouth message;
Fig. 5 is the protocol stack schematic diagram of traditional TUP signaling;
Fig. 6 is the protocol stack schematic diagram that adopts soft switch structure TUP signaling afterwards;
Fig. 7 is the call establishment schematic diagram in a preferred embodiment of the invention;
Fig. 8 is switching in a preferred embodiment of the invention/refund a process schematic diagram.
Embodiment
In the following embodiment, describe with network and the custom of CDMA2000, but the solution of the present invention is not limited to CDMA2000, is suitable for too in WCDMA and fixed network.
Because the beared information of call setup is arranged in the media gateway (MGW), thus can be by MGW and MSCe (mobile soft switch center) come recovering bearing information alternately.Yet by aforementioned content as can be known, a recovering bearing information is not enough, if can not recover signaling information, will cause follow-up signaling correctly to handle.Since beared information is arranged on the MGW, can be further on MGW, increase and preserve signaling and user profile, like this, by MGW and MSCe alternately, just information such as recovering bearing, signaling, user, ticket comprehensively realize seamlessly transitting of switching services, service returning process.Specific practice is that in call establishment, MSCe increases additional information (comprising signaling link information, user profile etc.) in giving the carrying operational order of MGW; And preserve these additional informations by MGW.
When switching or refund, MGW can report MSCe to the beared information of its preservation, user profile, signaling information after being registered on the new MSCe together, is recovered by the MSCe information of carrying out, and rebuilds calling signaling, carrying, user's ticket information.
If do not switch, refund, the additional information of issuing MGW is otiose.In order to guarantee not influence normal Business Processing efficient, additional information should be simplified as far as possible.Wherein,
(1) for passing through the information that the static data configuration querying recovers, it can be omitted, setting up signaling by CIC with the opposite end entity such as relayings such as TUP, ISUP is connected, its CIC information can be looked into static data and obtain by the Termination that MGW reports, so its call information can be with CIC;
(2),, local terminal is connected with the opposite end with reference to being dynamic data, so must be increased in the additional information because connecting reference for A message.
(3) because the ticket informational needs passes through data recoveries such as caller and called users information, turn-on time, so corresponding data also must be increased in the additional information.
When switching services taking place or refunds, after the MGW registration finishes, just by Notify message informing MSCe call information.MGW reports MSCe to relevant Context, termination, calling additional information simultaneously.Adopt flow control to report during reporting information, two kinds of flow control modes are arranged: report according to fixing Context number in the first unit interval, report up to all Context information and finish; It two is mean allocation Context numbers at the appointed time, evenly reports.
Termination among the present invention (end points) is the logic entity on the MGW, can be used to identify the circuit resource on the MGW.Context (context) is used to show the annexation between end points.Wherein, Context is applied for that by MSCe MGW distributes, and after two end points added same Context, default was that two Termination are carried out two-way connection.That is to say, after the Termination of calling and called circuit is added same Context, in fact exactly the calling and called circuit is carried out the two-way net that connects.
After MSCe receives call information, to the carrying of stable state call recovery, signaling, ticket information; Call out then initiation for unstable state and take out stitches, and send clear message, in order to avoid the opposite end actual resource is hung to the opposite end entity.
During concrete enforcement, the processing in the call establishment as shown in Figure 7.Respectively each step is illustrated below.
Step 701, calling subscriber make a call, and caller BSC sends CM service request (CMService Req) message to MSCe, has calling subscriber identification, called number etc. in this message.This message is carried with the CR message of SCCP, wherein also has the connection reference of BSC side.
The connection reference that step 702, MSCe distribute local terminal, and the circuit between distribution MSCe and caller BSC (identify this circuit with CIC between MSCe and BSC; Identify this circuit with Termination between MSCe and MGW).Then, MSCe send to add end points message (ADD) to MGW, wherein have Termination information (this end points for and BSC between circuit), require an application context (Context), and Termination added this Context.In the present embodiment, also in this message, increase additional call information: comprise calling user information and with the signaling annexation (comprising that local terminal is connected reference and is connected reference with the opposite end) of BSC.
Step 703, MGW distribute a Context, and corresponding Termination is added this context, and return messages are given MSCe then, the corresponding Context of MSCe record, and MGW writes down aforementioned additional call information simultaneously.
Step 704, MSCe send assignment request message (Assignment Request) to caller BSC, require to set up the land circuit between MSC and BSC and the channel of eating dishes without rice or wine; This message is carried with the CC message of SCCP, and has the connection reference of MSC and the reference that is connected of BSC side.
Step 705, for called be mobile subscriber's situation, MSC gets called positional information to HLR.
If step 706 HLR finds called just in the MSC that initiates request, then direct return messages are indicated called in the MSC of initiation position requests;
After the land circuit of step 707, caller BSC and the channel of eating dishes without rice or wine were built up, BSC sent assignment to MSCe and finishes message (Assignment Complete); This message is carried with the DT message of SCCP, has the connection reference of MSC.
Step 708, MSCe send out beep-page message (Paging Request) to called place BSC; This message is carried with the connectionless information UDT message of SCCP.
Step 709, paging are after called, and called BSC sends page-response message (PagingResponse) to MSC.This message is carried with the CR message of SCCP, the connection reference of band BSC side.
The connection reference that step 710, MSCe distribute local terminal distributes the circuit between MSCe and called BSC.MSCe sends to MGW and adds end points message (ADD), and band is Context, the callee side Termination information of application just now.In this message, also increase additional call information: comprise called user information, with the signaling annexation of BSC (local terminal be connected reference be connected with reference to) with the opposite end.
Step 711, MGW add this context to callee side Termination, and return messages are given MSCe then.MGW writes down aforementioned additional call information.
Step 712, MSCe send assignment message to called BSC, require to set up the land circuit between MSC and BSC and the channel of eating dishes without rice or wine, and band ring parameter allows dialed terminal bell in message; This message is carried with the CC message of SCCP, the connection reference of band MSC and the reference that is connected of BSC side.
After step 713, land circuit and the channel of eating dishes without rice or wine were built up, called BSC sent assignment to MSC and finishes message; This message is carried with the DT message of SCCP, the connection reference of band MSC.
Step 714, MSCe send to MGW and revise bearer messages (Modify), band Calling Side Termination, and notice MGW is put ring-back tone to Calling Side.
Behind step 715, the MGW complete operation, echo to MSCe and to answer message (Reply).
Behind step 716, the called party answer, called BSC sends CONNECT message to MSCe; This message is carried with the DT message of SCCP, the connection reference of band MSCe.
Step 717, MSCe send to MGW and revise bearer messages (Modify), band Calling Side Termination, and notice MGW stops to put ring-back tone to Calling Side, and calling and called Termination is carried out the two-way net that connects.Increased additional call information in the described modification bearer messages: comprise caller and called users information, turn-on time, steady state flag etc.
Step 718, MGW echo to MSCe and answer message (Reply).
In above-mentioned steps, MGW also writes down the additional call information in the related news except that carrying out normal normal carrying operation, uses in order to switching services or when refunding.
Processing procedure when switching services or service returning take place as shown in Figure 8.Wherein,
After step 804, MSCe receive reporting information, carry out differentiating and processing, send corresponding push-notification-answer to MGW according to the steady state flag in the additional information of Contex:
(1) for the calling that is in stable state, according to Context, Termination recovering bearing information; According to the additional information recovery of Termination and the signaling link information of other entity; Recover user profile, ticket information according to the additional information of Context, the additional information of Termination.
(2) for calling that is not in stable state or the infull calling of information, then send the message of releasing bearing to MGW, send clear message to the opposite end entity, in order to avoid the opposite end actual resource is hung.
As seen from the above-described embodiment, by method of the present invention, when switching services or service returning took place between the active and standby MSCe, the stable state of having set up was called out and can normally be kept, and the subsequent voice calls signaling also can correctly be handled, and normal call list.Call out for unstable state, then can discharge the resource of MGW and opposite end entity, in order to avoid resource from suspending.
Subordinate list: used herein abbreviation
Claims (8)
1, switching services in a kind of double attaching system/method of recovery business datum when refunding is characterized in that, may further comprise the steps:
(S1) in calling procedure, when soft switch center sends the carrying operational order in the media gateway to its registration, increase the transmission corresponding additional information;
(S2) media gateway is carried operation, and preserves the described additional information that it is received;
(S3) switching services/when refunding, described re-registering media gateway arrives another soft switch center, and reports the call information that has described additional information when taking place;
(S4) described another soft switch center is according to its call information of receiving that comprises described additional information, judge whether current calling is that stable state is called out, if then recover corresponding beared information, signaling link information and user profile according to the call information that comprises described additional information.
2, method according to claim 1 is characterized in that, in described step (S4), is that unstable state is called out if judge current calling, and then described soft switch center sends the message of releasing bearing to media gateway, and sends clear message to the opposite end entity.
3, method according to claim 1 is characterized in that, in described step (S4), calls out for stable state, also recovers its ticket information.
4, method according to claim 1 is characterized in that, at mobile communication system,
Described additional information comprises signaling link information and user profile;
Comprise in the call information that in described step (S3), reports: the additional information of the additional information of Context, Context, Termination and Termination;
In described step (S4), described another soft switch center judges according to the steady state flag in the additional information of Context whether current calling is that stable state is called out.
5, method according to claim 4 is characterized in that, in described step (S4), is that stable state is called out if judge current calling, then:
According to described Context, Termination recovering bearing information;
According to the additional information recovery of described Termination and the signaling link information of other entity;
Recover user profile and ticket information according to the additional information of described Context, the additional information of Termination.
6, according to each described method among the claim 1-5, it is characterized in that, in described step (S3), adopt the mode of flow control to report described call information.
7, method according to claim 6 is characterized in that, described flow control mode is: report according to fixing Context number in the unit interval, report up to all Context information and finish.
8, method according to claim 6 is characterized in that, described flow control mode is: mean allocation Context number at the appointed time evenly reports.
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| CN1434574A (en) * | 2002-01-24 | 2003-08-06 | 华为技术有限公司 | Backup method for mobile exchange center |
| CN1536819A (en) * | 2003-04-11 | 2004-10-13 | 华为技术有限公司 | Method for implementing dual home in next network |
| US20050039069A1 (en) * | 2003-04-03 | 2005-02-17 | Anand Prahlad | Remote disaster data recovery system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1434574A (en) * | 2002-01-24 | 2003-08-06 | 华为技术有限公司 | Backup method for mobile exchange center |
| US20050039069A1 (en) * | 2003-04-03 | 2005-02-17 | Anand Prahlad | Remote disaster data recovery system and method |
| CN1536819A (en) * | 2003-04-11 | 2004-10-13 | 华为技术有限公司 | Method for implementing dual home in next network |
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