CN102595360B - Call processing method and system - Google Patents
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Abstract
The invention discloses call processing method and system, the method includes: WMG MG after the first media gateway controller MGC registered from it is switched on the 2nd MGC, MG called；The user profile of MG is sent to the 2nd MGC by upper layer network element；2nd MGC initiates the register flow path of MG, and replay call to upper layer network element.By The present invention reduces call loss.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of call processing method and system.
Background technology
Next generation network (NextGenerationNetwork, referred to as NGN) and IP Multimedia System (IPMultimediaSubsystem, referred to as IMS) in, by traditional switch is separated into Media Gateway Controller (MediaGatewayController, referred to as MGC) and WMG (MediaGateway, referred to as MG), utilize the feature of IP/ATM transmission network, on the one hand can realize voice, image, data mutual, on the other hand MGC more can more easily introduce business.MGC can also pass through MG and traditional PSTN (PublicSwitchedTelephoneNetwork, referred to as PSTN), public land mobile net (PublicLandMobileNetwork, referred to as PLMN) network interworking.
In next generation network, or MGCP (MediaGatewayControllerProtocol H.248, referred to as MGCP) (two agreement application scenarios are similar with effect, the most for convenience of description, as unrelated with concrete agreement, only with the most individually explanation) as the main medium gateway protocol between MGC and MG, mainly complete: (1), under MGC control, completes foundation and the release of media channel in MG；(2) under MGC control, complete the media channel in MG and bearer path be attached and removed from connect；(3) under MGC control, complete in MG to media channel and the configuration of the attribute of bearer path；(4) in MG, MGC is completed to media channel and the operation of bearer path, including playback, audit etc.；(5) event in MG is reported MGC；(6) some simple call signalings are realized, such as analog line signaling, channel associated signalling etc..It can be seen that be H.248/MGCP a kind of control protocol up and down, MGC controls the behavior of MG completely.
Along with soft switch and the development of IMS, substantial amounts of subscriber terminal equipment access network gateway controller, cause IP address in short supply, the problems such as terminal user management is complicated, the safety of system.Edge access controls equipment (BorderAccessControl, referred to as BAC, also has multiple different expression, as: broad access network gate (BGW-BroadGateWay), session-orient E-Service equipment SBC-SessionBorderControl) different types of user (including enterprise, individual, mobile subscriber) can be met simultaneously, the access demand of multiple capacity, and support various protocols MGCP, agent functionality H.248 simultaneously.Realize signaling, Media Stream addresses conversion, access the certification of user, management, the functions such as the control of Business Stream manages, resource management.
From telecom operation angle, break or equipment fault, on network organizing, it is necessary to have disaster-tolerant backup to consider for the network avoiding various emergency situations to cause.Fig. 1 is the network architecture schematic diagram of the IMS according to correlation technique, as it is shown in figure 1, the MGC that MG accesses, at least needs two MGC, as active and standby.Meanwhile, also it is similar when MG is by BAC access MGC, needs two MGC as active and standby.Fig. 2 is the network architecture schematic diagram that the IMS according to correlation technique occurs MGC switching, as in figure 2 it is shown, when MGC there occurs switching, and owing to MG is numerous, or MG fails the reasons such as timely discovery, also have not enough time to toward new MGC registration, so that the problem that newly generated calling cannot continue.
At AGCF (AccessGatewayControlFunction, referred to as AGCF) 1, it should be noted that the function of AGCF1 realization herein is identical with the function of MGC realization.MG accesses IMS network and in the case of network condition is normal between MG, and MG belongs to AGCF1, and if it occur that AGCF1 breaks down, or network problem occurs, then MG can be switched to AGCF2 automatically, the most usually said disaster tolerance switching.It should be noted that under the network architecture having BAC, see that Fig. 2, BAC disaster tolerance switches, belonging to new MGC, MG now and be unaware of completely, this situation is easier to occur, but is not limited to this scene.And for AGCF2, all MG that switching comes are brand-new users, it is needed to re-register.In this hour of log-on, if MG produce again new called, the processing mode of prior art is all direct refusal, and Fig. 3 is according to the flow chart of AGCF switching in correlation technique, as it is shown on figure 3, this flow process comprises the steps:
Step S301, MG (such as, passing through BAC) is registered under AGCF1；
Step S302, occurs between MG and AGCF1 that network failure or MG occur the reasons such as disaster tolerance automatically so that MG belongs under AGCF2；
If it should be noted that access by meeting BAC, BAC is switched to new AGCF, for MG, and the not disaster tolerance switching action of perception BAC；Without BAC, then MG equipment automatically switches into MGC2, but does not initiate registration.
Step S303, IMS core layer CSCF (CallSessionControlFunction, referred to as CSCF, including I/P/S-CSCF) is called, finds called subscriber corresponding for AGCF2 for the user under MG；
Step S304, for AGCF2, this MG did not the most register, therefore necessarily refused this calling.Whole flow process terminates, call failure.
The user accessed due to AGCF, enormous amount in theory, the time that such MG re-registers needs is longer, in this hour of log-on, if MG produce again called, owing to the most not registering on AGCF2, therefore necessarily refuse this calling thus cause the problem of call loss.
Summary of the invention
Present invention is primarily targeted at a kind of call processing method of offer and system, at least to solve the problems referred to above.
According to an aspect of the invention, it is provided a kind of call processing method, including: WMG MG after the first media gateway controller MGC registered from it is switched on the 2nd MGC, described MG called；The user profile of described MG is sent to described 2nd MGC by upper layer network element；Described 2nd MGC initiates the register flow path of described MG, and the described calling that continues to described upper layer network element.
Preferably, at described WMG MG before its MGC registered is switched to described 2nd MGC, also include: a described MGC is to upper strata network element registration, and the user profile of the described MG of registration on a described MGC is sent to this upper layer network element.
Preferably, a described MGC carries the user profile of described MG by the contact CONTACT field of session initiation protocol SIP, and the user profile of described MG is sent to upper layer network element.
Preferably, at described 2nd MGC before described upper layer network element initiates the register flow path of described MG, the legitimacy of the user profile of described MG is verified by described 2nd MGC, and after being verified, then the register flow path of described MG is initiated to described upper layer network element.
Preferably, at described 2nd MGC before described upper layer network element initiates the register flow path of described MG, described 2nd MGC is authenticated according to the user profile of described MG, and in certification by afterwards, then the register flow path of described MG is initiated to described upper layer network element.
Preferably, at described 2nd MGC before described upper layer network element initiates the register flow path of described MG, according to the strategy pre-set, described 2nd MGC determines whether that described upper layer network element initiates the register flow path of described MG, wherein, the strategy pre-set described in is for determining the MG needing to initiate register flow path.
Preferably, said method also includes: determine not in the case of described upper layer network element initiates the register flow path of described MG at described 2nd MGC, and described 2nd MGC refuses described calling.
Preferably, the user profile of described MG is carried in the request line Requestline field of Session Initiation Protocol by described upper layer network element, and is sent to described 2nd MGC.
Preferably, described upper layer network element is CSCF CSCF.
According to a further aspect in the invention, additionally provide a kind of call processing system, including: WMG MG, the first media gateway controller MGC, the 2nd MGC and upper layer network element, described upper layer network element is for being switched on the 2nd MGC from its described MGC registered at described MG and after called, the user profile of described MG is being sent to described 2nd MGC；Described 2nd MGC for initiating the register flow path of described MG to upper layer network element, and the described calling that continues.
Preferably, a described MGC is used for upper strata network element registration, and the user profile of the described MG of registration on a described MGC is sent to this upper layer network element.
By the present invention, WMG MG is after the first media gateway controller MGC registered from it is switched on the 2nd MGC in employing, described MG called；The user profile of described MG is sent to described 2nd MGC by upper layer network element；Described 2nd MGC initiates the register flow path of described MG, and the described calling that continues to upper layer network element.The problem solving the call loss produced because of disaster tolerance switching, and then decrease call loss.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the network architecture schematic diagram of the IMS according to correlation technique；
Fig. 2 is the network architecture schematic diagram that the IMS according to correlation technique occurs MGC switching；
Fig. 3 is according to the flow chart of AGCF switching in correlation technique；
Fig. 4 is the flow chart of the call processing method implemented according to the present invention；
Fig. 5 is the flow chart of call processing method according to the preferred embodiment of the invention.
Detailed description of the invention
Below with reference to accompanying drawing and describe the present invention in detail in conjunction with the embodiments.It should be noted that in the case of not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined.
Illustrate as a example by MGC in the present embodiment, but MGC herein includes network entity and the functional module being capable of MGC function, such as, AGCF (AccessGatewayControlFunction, referred to as AGCF).
Present embodiments providing a kind of call processing method, Fig. 4 is the flow chart of the call processing method implemented according to the present invention, and as shown in Figure 4, this flow process comprises the steps:
Step S402, MG user's called (being referred to as MG called) after the MGC registered from it is switched on the 2nd MGC, on this MG；
Step S404, the user profile of this MG is sent to the 2nd MGC by upper layer network element, and wherein, upper layer network element can be with any network element that can realize its function, and such as, upper layer network element is CSCF CSCF；
Step S406, the 2nd MGC initiates the register flow path of MG, and replay call to upper layer network element.It should be noted that the upper layer network element of this step can be the same upper layer network element (upper layer network element in the present embodiment is CSCF) in step S404, it is also possible to be not same upper layer network element.
By above-mentioned steps, when MG is called, the user profile on this MG is sent to the 2nd MGC, the 2nd MGC and initiates the register flow path of MG by upper layer network element, changes the way of directly refusal in prior art, thus solves problems of the prior art.
Preferably, when implementing, upper layer network element can get the user profile of this MG in several ways, and such as, a MGC is when the network element registration of upper strata, and the user profile of the MG registered thereon is sent to upper layer network element by a MGC；The message being exclusively used in transmission MG user profile can not also be used to be transmitted when registration.Certain user profile when registration to upper layer network element transmission MG implements more convenient.Preferably, a MGC carries the user profile of MG by the contact CONTACT field of session initiation protocol SIP, and the user profile of MG is sent to upper layer network element.
Preferably, when implementing, in order to ensure the legitimacy of MG, at the 2nd MGC before upper layer network element initiates the register flow path of MG, the legitimacy of the user profile of MG can be verified by the 2nd MGC, and after being verified, the register flow path of MG is initiated again, such as, when implementing to upper layer network element, the checking carried out may include that tests the message header showing informed source in H248/MGCP message header, if be the user of legal configuration.
Furthermore it is preferred that at the 2nd MGC before upper layer network element initiates the register flow path of MG, the 2nd MGC is authenticated according to the user profile of MG, and in certification by afterwards, then initiate the register flow path of MG to upper layer network element.Certainly, certification with checking MG legitimacy step can together with carry out.It should be noted that certification belongs to optional step, can perform according to the configuration strategy of this user.Further, the processing mode of which kind of certification is used the most not affect the enforcement of this preferred implementation, it is for instance possible to use general md5 authentication algorithm is authenticated.
Preferably, in order to distinguish whether MG supports the process in the present embodiment, can pre-establish good strategy, this strategy determines whether to use the process in the present embodiment for different MG.Such as, at the 2nd MGC before upper layer network element initiates the register flow path of MG, according to the strategy pre-set, the 2nd MGC determines whether that upper layer network element initiates the register flow path of MG, wherein, the strategy pre-set is for determining the MG needing to initiate register flow path.By using this strategy, operator can be made to distinguish MG can use the process in the present embodiment, other purpose can be reached by such differentiation, such as, it is contemplated that whether the function provided in the present embodiment be carried out charge etc..
Preferably, if using above-mentioned processing procedure (such as, above-mentioned verification process, tactful judge process, legitimate verification process), determine not in the case of upper layer network element initiates the register flow path of MG at the 2nd MGC, the 2nd MGC refusal calling.
Preferably, the user profile of MG is carried in the request line Requestline field of Session Initiation Protocol by upper layer network element, and is sent to the 2nd MGC.
In the present embodiment, additionally provide a kind of call processing system, including MG, a MGC, the 2nd MGC and upper layer network element, upper layer network element is for being switched on the 2nd MGC at the MGC that registers from it at MG and after called, the user profile of MG being sent to the 2nd MGC；2nd MGC for initiating the register flow path of MG to upper layer network element, and replay call.
Preferably, a MGC is used for upper strata network element registration, and the user profile of the MG of registration on a MGC is sent to this upper layer network element.
There is disaster tolerance by system solves the problem MGC, such as, being accessed by BAC, in the case of BAC there occurs disaster tolerance switching, the problem of a large amount of call losses of generation, reach to meet the effect of telecom operation maintenance requirement.
Preferred embodiment below is the explanation carrying out the situation having BAC to access, but during actual enforcement, it is not limited to have the situation that BAC accesses, when not having BAC to access, being omitted by BAC in flow chart, switching from MG as a example by AGCF below proceeds by explanation.Fig. 5 is the flow chart of call processing method according to the preferred embodiment of the invention, as it is shown in figure 5, this flow process comprises the steps:
Step S501, MG normal registration to AGCF1, it should be noted that MG is to the normal registration process of AGCF1, carry out before disaster tolerance switches, be normal at AGCF and the registration that carries out in the case of normally of network；
Step S502, relevant user information, when the key-course CSCF of higher registers, is carried by AGCF1.It should be noted that, user related information herein carries to CSCF when normal registration, and it carries the mode more than one of user profile, such as, can be by the contact CONTACT field of Session Initiation Protocol by required user related information band, and this non-expanding natively having as agreement of field；
Step S503, CSCF, including service call conversation control function (Service-CSCF, referred to as S-CSCF) and query CSCF (Interrogating-CSCF, referred to as I-CSCF), during registration, the user related information this locality carried by AGCF1 preserves；
Step S504；After succeeding in registration, CSCF replys success response to AGCF；
Step S505, AGCF replys, to MG, response of succeeding in registration；
, there is network condition in step S506, if there being the situations such as BAC, BAC switch between MG and AGCF, MG switches to AGCF2；
Step S507, core side initiates calling, user under called calling MG；
Step S508, CSCF finds the AGCF2 of adapter MG at present, and callee side call flow starts；
It should be noted that, the user related information carried up by AGCF1 registration before is carried by CSCF, user profile is carried the mode got off in the specific implementation herein, determine the mode of the situation at that time that is suitable for as the case may be, such as, user profile carries by the Requestline field of Session Initiation Protocol.
Step S509, the flow processs (certification is optional, determines) such as the legitimacy of the user profile got off, and certification are carried in AGCF2 verification according to corresponding strategies configuration；
Step S510, if upper step is passed through, judges this MG flow process the need of the automatic connection calling entering present claims further according to strategy；
Step S511, if step S509 and step S510 all can not be passed through, then replys ERROR directly to MG, and processing mode now is similar with prior art flow process, i.e. refuses this calling；
Step S512, if step S509 and step S510 are all passed through, then on behalf of the register flow path of this MG of initiation, locally located state is for registering through；
Step S513, initiates registration to CSCF, and AGCF is similar to Proxy Call Session Control Function (Proxy-CSCF, referred to as P-CSCF), therefore, it is to query CSCF (Interrogating-CSCF, referred to as I-CSCF) registration in this step；
It should be noted that a MG, its possible more than one of lower user, its relevant processing mode is similar with multiple flow processs, and this illustrates as a example by sentencing a user.
Step S514, I-CSCF is to home subscriber server (HomeSubscriberServer, referred to as HSS) searching for user relevance information；
Step S515, HSS returns user related information；
Step S516, I-CSCF selects the service call conversation control function (Service-CSCF, referred to as S-CSCF) of ownership；
Step S517, I-CSCF is to the S-CSCF registration of ownership；
Step S518, S-CSCF is authenticated to HSS, it should be noted that this place configures according to strategy, optional, if need not, leaps to step S527 step, but without authentication information, i.e. need not the register flow path of certification；
Step S519, initiates certification；
Step S520, due to registration for the first time, does not has authentication information, typically this certification registration failure, and HSS returns unsuccessfully；
Step S521, same S-CSCF returns registration failure message to I-CSCF；
Step S522, same I-CSCF returns registration failure message to AGCF；
Step S523, AGCF carries authentication information registration again；
Step S524, I-CSCF is again to HSS searching user's information；
Step S525, HSS returns user related information；
Step S526, I-CSCF chooses the S-CSCF of ownership；
Step S527, I-CSCF is to the S-CSCF of ownership, and this carries authentication information；
Step S528, S-CSCF is authenticated registration to HSS；
Step S529, owing to this is registered, carries relevant authentication information, and this certification registers through, and HSS returns successfully；
Step S530, S-CSCF returns, to I-CSCF, the message that succeeds in registration；
Step S531, I-CSCF returns, to AGCF, the message that succeeds in registration；
Step S532, AGCF has returned to MG and has exhaled response message, and this calls normal continuance.
Can solve in next generation network (NGN)/IP Multimedia System (IMS) by above preferred embodiment, access gateway at its core control equipment accessed (such as, accessed by BAC or do not accessed by BAC) occur disaster tolerance switching after, the problem of a large amount of call losses produced, decrease the call loss problem caused due to switching, thus reached the switching making user completely dispense with perception core control equipment, meet the effect of carrier class operating and maintenance requirements.
Obviously, those skilled in the art should be understood that, each module of the above-mentioned present invention or each step can realize with general calculating device, they can concentrate on single calculating device, or it is distributed on the network that multiple calculating device is formed, alternatively, they can realize with calculating the executable program code of device, perform such that it is able to be stored in storing in device by calculating device, or they are fabricated to respectively each integrated circuit modules, or the multiple modules in them or step are fabricated to single integrated circuit module realize.So, the present invention is not restricted to the combination of any specific hardware and software.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (11)
1. a call processing method, it is characterised in that including:
WMG MG after the first media gateway controller MGC registered from it is switched on the 2nd MGC, described MG called；
The user profile of described MG is sent to described 2nd MGC by upper layer network element；
Described 2nd MGC initiates the register flow path of described MG, and the described calling that continues to described upper layer network element.
Method the most according to claim 1, it is characterised in that at described WMG MG before its MGC registered is switched to described 2nd MGC, also include:
A described MGC is to upper strata network element registration, and the user profile of the described MG of registration on a described MGC is sent to this upper layer network element.
Method the most according to claim 2, it is characterised in that a described MGC carries the user profile of described MG by the contact CONTACT field of session initiation protocol SIP, and the user profile of described MG is sent to upper layer network element.
Method the most according to claim 1, it is characterised in that
At described 2nd MGC before described upper layer network element initiates the register flow path of described MG, the legitimacy of the user profile of described MG is verified by described 2nd MGC, and after being verified, then the register flow path of described MG is initiated to described upper layer network element.
Method the most according to claim 1, it is characterised in that
At described 2nd MGC before described upper layer network element initiates the register flow path of described MG, described 2nd MGC is authenticated according to the user profile of described MG, and in certification by afterwards, then the register flow path of described MG is initiated to described upper layer network element.
Method the most according to claim 1, it is characterised in that
At described 2nd MGC before described upper layer network element initiates the register flow path of described MG, according to the strategy pre-set, described 2nd MGC determines whether that described upper layer network element initiates the register flow path of described MG, wherein, the strategy pre-set described in is for determining the MG needing to initiate register flow path.
7. according to the method according to any one of claim 4 to 6, it is characterised in that also include
Determining not in the case of described upper layer network element initiates the register flow path of described MG at described 2nd MGC, described 2nd MGC refuses described calling.
Method the most according to any one of claim 1 to 6, it is characterised in that
The user profile of described MG is carried in the request line Requestline field of Session Initiation Protocol by described upper layer network element, and is sent to described 2nd MGC.
Method the most according to any one of claim 1 to 6, it is characterised in that described upper layer network element is CSCF CSCF.
10. a call processing system, including: WMG MG, the first media gateway controller MGC, the 2nd MGC and upper layer network element, it is characterised in that
Described upper layer network element is for being switched on the 2nd MGC from its described MGC registered at described MG and after called, the user profile of described MG is being sent to described 2nd MGC；
Described 2nd MGC for initiating the register flow path of described MG to upper layer network element, and the described calling that continues.
11. systems according to claim 10, it is characterised in that
A described MGC is used for upper strata network element registration, and the user profile of the described MG of registration on a described MGC is sent to this upper layer network element.
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