CN100417293C

CN100417293C - Call handling method

Info

Publication number: CN100417293C
Application number: CNB2005100768958A
Authority: CN
Inventors: 朱浩鹏; 廖志军
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2005-06-20
Filing date: 2005-06-20
Publication date: 2008-09-03
Anticipated expiration: 2025-06-20
Also published as: CN1885991A; WO2006136098A1

Abstract

The present invention discloses a call processing method which is used for solving the problem that in the prior art, because an initiating mobile soft switch server can not distinguish connection failure reasons, a call releasing processing is simply carried out, and thus, the success ratio of calls is low. The call processing method comprises the steps as follows: a first mobile soft switch server sends a call message which carries a called party terminal address to a second mobile soft switch server for establishing connection; when the second mobile soft switch server fails to establish the connection of the call, an REL message which carries a reason value is replied, wherein the reason value identifies a connection failing reason; the first mobile soft switch server judges whether the connection of the call can be established by a third mobile soft switch server or not according to local route configuration information; if the connection of the call can be established by the third mobile soft switch server, the call message is sent to the third mobile soft switch server for establishing the connection, and otherwise, the call is released.

Description

A kind of call processing method

Technical field

The present invention relates to mobile communication technology, disclose a kind of call processing method especially.

Background technology

3G (Third Generation) Moblie WCDMA (Wideband Code Division Multiple Access, CDMA access metwork) 3GPP (3rd Generation Partnership Project, 3rd Generation Partnership Project) R4 (Release 4) is with core network circuit domain MSC (Mobile services SwitchingCenter, mobile switching centre) is split as MSC Server (mobile soft switching server) and MGW (MediaGateway, media gateway) two equipment, thereby realized separating of professional control and service bearer, wherein: core network circuit domain MSC server and MGW are two separate equipment, and the centre connects by Mc interface.MSC Server equipment is mainly finished and is called out control, media gateway is finished carrying control.Mc interface is the control interface between MSC Server and the MGW, and MSC Server controls MGW by the Megaco/H.248 agreement.

As shown in Figure 1, be the basic procedure of the processing of calling out, wherein: mobile soft switching server 1 is for calling out originating server, and mobile soft switching server 2 is for calling out the tandem server, and handling process may further comprise the steps:

S1, MSC Server1 receive the IAM that is carrying called terminal number called party number (the Initial address message) message related to calls of Incoming;

S2, MSC Server1 analyze called terminal number, and the routing mode of determining this calling is mobile soft switching server 2 pairing office points, and MSC Server1 just sends IAM message to MSC Server2 so;

Under the normal condition, MSC Server2 calls out by the media gateway and the circuit connection that remove terminal called, still, when MSC Server2 can't normally continue this calling because of various faults, execution in step S3;

S3, MSC Server2 return a REL (Release message) message informing this call failure that continues to MSC Server1;

S4, after MSC Server1 receives REL message, return a RLC (Release complete message) acknowledge message to MSC Server2, and call release.

In the REL message, carry the cause value of indicating the failure cause that continues, MSC Server1 can carry out statistical analysis to these cause values.But do not carry cause value different handling processes is set calling out originating terminal, but adopt the processing mode of call release to carry out simple process without exception, reduced calling ratio of success, influenced user's satisfaction according to REL.

And, the cause value that carries in the existing REL message is to fill in according to the failure cause code that Q.850 ITU-T defines in the agreement, Q.850, the failure cause that ITU-T relates in the agreement all is to define according to the fault type that occurs in the R99 networking model, and for introduce the fault that two new classes can cause routing failure because of separation architecture: media gateway fault and circuit are no-trunk not to define new cause value.

Summary of the invention

The present invention discloses a kind of call processing method, to solve in the prior art, because of the not discriminating connection failure cause of mobile soft switching server that starts, simply carries out the call release processing and the low problem of call successful rate that causes.

A kind of call processing method comprises the steps:

The message related to calls that A, first mobile soft switching server will carry the terminal called address sends to second mobile soft switching server and continues;

B, second mobile soft switching server return the release request REL message of carrying cause value when continuing described call failure, the reason that described cause value sign continues and fails;

C, first mobile soft switching server judge whether according to local routing configuration information can be by the described calling that continues of the 3rd mobile soft switching server, if execution in step D then; If otherwise execution in step E;

D, first mobile soft switching server send to the 3rd mobile soft switching server with described message related to calls and continue;

E, first mobile soft switching server discharge described calling.

When described cause value during for relevant cause value except that terminal called is unreachable, first mobile soft switching server is carried out described judgement.

Described cause value except that terminal called is unreachable comprises: sign is gone to the media gateway fault and/or the no-trunk cause value of circuit of terminal called.

Described step B comprises: described media gateway fault or circuit are no-trunk to be confirmed according to local available resource information by second mobile soft switching server.

Described method also comprises: the step of adding up described cause value and analyzing.

Beneficial effect of the present invention is as follows:

Use the method for the invention, when call proceeding is failed, select other available soft switching servers to carry out alternate route, calling ratio of success according to local routing configuration information;

Further, the reason of the failure that continues is divided into two big classes, one class be terminal called self cause unreachable, have every other reason in the reason another kind of comprising now, in originating terminal soft switching server side, utilize the cause value that carries in the existing REL message that two class reasons are judged, if the first kind, call release then, no longer occupying system resources carries out insignificant circuitous, if second class according to local routing configuration information, is carried out alternate route when other available servers can continue this calling;

And, existing cause value is expanded, increased because two class faults under mobile soft switching server and the media gateway separation architecture: the cause value that out media gateway and outgoing circuit are no-trunk, make the originating terminal soft switching server can discern this two kinds of failure causes that continue, thereby utilize above-mentioned circuitous method further to improve call successful rate, improved the reliability of cause value being carried out statistics and analysis simultaneously.

Description of drawings

Fig. 1 is call flows figure in the prior art;

Fig. 2 is of the present invention by the circuitous call flows figure of other soft switching servers.

Embodiment

Variation along with networking mode, network configuration is more flexible, in the call routing process, if not the call failure that can't connect generation owing to terminal called is busy, shutdown etc., but since the problem of route office self cause can't successful route this when calling out, can utilize mobile soft switching server to carry out the alternate route handling process as shown in Figure 2 fully:

Wherein, step S1～S3 is identical with prior art;

S4, after MSC Server1 receives REL message, return a RLC acknowledge message to MSC Server2, at this moment not direct call release, but the cause value of Cause parameter among the analysis REL, judge according to the alternate route strategy of formulating, if the failure cause that continues that can alternate route, then execution in step S5; Otherwise call release.

Alternate route strategy described here is arranged in the configuration information of mobile soft switching server, in the alternate route strategy, the cause value of the failure that continues is divided into two big classes: the first kind is that terminal called does, shutdown etc. temporarily can't be connected the failure that continues of generation, for example: existing ITU-T Q.850 in the agreement cause value be the failure causes that continue such as 17,18, corresponding cause value is called the unreachable cause value of terminal, at this moment, should discharge immediately, no longer occupying system resources; Second class is the mobile soft switching server side that carries out tandem owing to the normally failure that continues that causes of routing call of reasons such as circuit, comprise the every other reason except that terminal called is unreachable, the present invention is called reason except that terminal called is unreachable with these reasons, relative cause value is called the cause value except that terminal called is unreachable, at this moment, if network configuration allows, can carry out alternate route, replay call by another mobile soft switching server.

Therefore, mobile soft switching server is after receiving REL message, and whether the cause value of at first analyzing Cause parameter among the REL belongs to the second class cause value, if an outgoing route, execution in step S5 are reselected in configuration according to route data.

Specifically how cause value is divided into the first kind and second class, can uses factors such as situation, quality of service policy to determine according to resource, do not limit protection scope of the present invention by operator.

In this step, also can select available mobile soft switching server to carry out alternate route to the calling of all failures that continue, but, if first kind reason, then follow-up circuitous majority is nonsensical, cause resource waste, therefore, the processing mode that preferable implementation is still classified according to concrete reason.

S5, MSC Server1 send IAM message, and the destination is the soft switching server 3 that carries out alternate route;

S6, S7, S8, S9, on MSC Server3, process is to the called number analysis, can find route called available media gateway and circuit, calling continues to continue, finally finish conversation, otherwise can also be then according to method provided by the invention search the 4th can alternate route soft switching server, when all routes are all obstructed, call release again.

By method provided by the invention, utilize the cause value that carries the failure that specifically continues in the REL message, the routing failure that the different reasons of flexible processing cause has improved calling ratio of success.

For realizing said method, send in the REL message of MSC Server1 at MSC Server2, must carry clear and definite cause value, so that whether decision carries out alternate route, but under the core net separation architecture two kinds of faults more often appear: the no-trunk fault of media gateway fault and circuit, owing to do not have in the prior art to this two kinds of fault definition reason-codes and handling process, causing caller MSC Server at first can't identify from the REL message of returning definite continue failure cause and can not select correct handling process to carry out alternate route, reduced calling ratio of success, because can't clearly add up the failure cause that continues, cause the performance evaluation of whole system also to have certain error simultaneously.

For addressing the above problem, need Q.850 expand the existing failure reason value that continues in the agreement at ITU-T, the enumeration definition of the Cause value of Cause parameter in the expansion BICC/ISUP signaling increases following two definition:

Cause value 35: it is no-trunk that newly-increased this enumerated value is used for indication circuit;

Cuase value 36: newly-increased this enumerated value is used for the presentation medium gateway fails.

Simultaneously, in the second class cause value of the circuitous strategy of MSC Server, increase by 35 and 36 two, when being checked through this cause value, call release does not continue but re-route other MSCServer at MSC Server.

35 and 36 two cause values are two free codes that Q.850 existing ITU-T does not use in the agreement, also can select other free codes, as long as the field figure place support of Cause parameter in the BICC/ISUP message.

And in the relevant treatment flow process of MSC Server, increase and to judge the whether whether no-trunk step of fault or circuit of media gateway, the current operating position of media gateway and circuit all is registered in the resource information of MSC Server and upgrades at any time, and detailed process is:

Utilize physical circuit to connect by Mc interface between MSC Server and the media gateway, media gateway is after powering on, authenticate to MSC server request registration, MSC server is set to useable medium gateway and registration by the media gateway of authentication registration, MSC server and media gateway can be in real time or are periodically sent whether fault of heartbeat message detection line afterwards, the media gateway side also can initiatively require MSC server deexcitation by related news mutual, MSC server line fault occurs or requires the media gateway of deexcitation to be set to unavailable media gateway and register, like this, MSC server can grasp the current available situation that disposes media gateway at any time; For the operating position of circuit, also in current available resource, register, carry out the foundation that circuit is selected during as MSC server routing call.

When more than one of the media gateway of removing terminal called, have only all faults or when not having the media gateway circuit of fault all to do of whole media gateway, MSC Server just can't this calling of route, at this moment, the route MSC Server failure cause that needs to continue is notified caller MSC Server in REL message.

To sum up, for MSC-SERVER1, calling begins to route to MSC-SERVER2, but at the MSC-SERVER2 call failure, return REL message, MSC-SERVER1 checks cause value, if 35 or 36, so just according to circuitous strategy, call release not, but re-route on the MSC-SERVER3, continue replay call, thereby improved user's satisfaction.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims

1. a call processing method is characterized in that, comprises the steps:

E, first mobile soft switching server discharge described calling.

2. the method for claim 1 is characterized in that, among the described step C: when described cause value during for relevant cause value except that terminal called is unreachable, first mobile soft switching server is carried out described judgement.

3. method as claimed in claim 2 is characterized in that, described cause value except that terminal called is unreachable comprises: sign is gone to the media gateway fault and/or the no-trunk cause value of circuit of terminal called.

4. method as claimed in claim 3 is characterized in that, described step B comprises: described media gateway fault or circuit are no-trunk to be confirmed according to local available resource information by second mobile soft switching server.

5. as claim 1,2,3 or 4 described methods, it is characterized in that described method also comprises: the step of adding up described cause value and analyzing.