CN100466561C - Method for deciding carried media gateway of media gateway controller - Google Patents

Method for deciding carried media gateway of media gateway controller Download PDF

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Publication number
CN100466561C
CN100466561C CNB2006100828402A CN200610082840A CN100466561C CN 100466561 C CN100466561 C CN 100466561C CN B2006100828402 A CNB2006100828402 A CN B2006100828402A CN 200610082840 A CN200610082840 A CN 200610082840A CN 100466561 C CN100466561 C CN 100466561C
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CN
China
Prior art keywords
mgw
connection status
mgc
media gateway
bearer path
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Expired - Fee Related
Application number
CNB2006100828402A
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Chinese (zh)
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CN101047570A (en
Inventor
李�杰
康明
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CNB2006100828402A priority Critical patent/CN100466561C/en
Priority to PCT/CN2007/070011 priority patent/WO2007137515A1/en
Publication of CN101047570A publication Critical patent/CN101047570A/en
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Publication of CN100466561C publication Critical patent/CN100466561C/en
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Abstract

A method of using media gateway controller to confirm gateway for carrying load includes setting connection state table for recoding connection state of MGW in MGC first, judging whether connection state of itself to network entity directly connected with selectable load-carry path is changed or not by MGW in real time, reporting variation situation of connection state to MGC if it is and updating connection state table, querying connection state tale and confirming one MGW with proper connection state as MGW used for carrying load when message of call setting-up request is received by MGC.

Description

The method of the media gateway that Media Gateway Controller is identified for carrying
Technical field
The present invention relates to set up the technology of carrying, particularly relate to the method for the media gateway that Media Gateway Controller is identified for carrying.
Background technology
At present, in the mobile network who introduces the flexible exchanging network framework, circuit domain core net is separated into loading end and chain of command.Wherein, loading end is made up of media gateway (MGW), and chain of command is made up of Media Gateway Controller (MGC).Interface between MGC and the MGW is a Mc interface, and carries out alternately according to agreement H.248.
In the mobile communications network of reality, one or more MGW can both link to each other with MGC, linked to each other with base station control device simultaneously again, and the network of composition is commonly referred to as the MINI-IU-FLEX network.
Fig. 1 is a typical MINI-IU-FLEX schematic network structure.As shown in Figure 1, the MINI-IU-FLEX network comprises MGC, first media gateway (MGW-1), second media gateway (MGW-2), the 3rd media gateway (MGW-3), wireless access side apparatus, bearer network, Public Land Mobile Nerwork/public switch telephone network (PLMN/PSTN).
Wherein, MGC links to each other with MGW-2 with MGW-1, and the wireless access side apparatus also links to each other with MGW-2 with MGW-1, and MGW-1, MGW-2, MGW-3 then link to each other by bearer network.Wireless access side apparatus described here can be the radio network controller (RNC) in the universal mobile telecommunications system (UMTS), also can be the base station controller (BSC) in the global system for mobile communications (GSM).
When the user terminal under the wireless access side apparatus and certain user terminal among the PLMN/PSTN are conversed, MGC need set up the bearer path between wireless access side apparatus and the PLMN/PSTN earlier, and user terminal under the wireless access side apparatus and the user terminal among the PLMN/PSTN could begin to converse by bearer path.MGC described here can be calling party's MGC, and promptly the user terminal under the wireless access side apparatus initiatively makes a call, and also can be callee's MGC, is promptly initiatively made a call by certain user terminal among the PLMN/PSTN.
Because MGC links to each other with MGW-2 with MGW-1 with the wireless access side apparatus, so, MGC both can select MGW-1 as the bearer network entity in setting up the process of bearer path, also can select MGW-2 as the bearer network entity.That is to say, bearer path can be made up of wireless access side apparatus, MGW1, bearer network, MGW3, PLMN/PSTN, also can be made up of wireless access side apparatus, MGW2, bearer network, MGW3, PLMN/PSTN, these two bearer paths can be called optional bearer path.Have only the MGW that is identified for carrying as MGC, finish after the foundation of bearer path, a certain optional bearer path just really becomes bearer path.In the prior art, MGC carries out polling between MGW-1 and MGW-2, promptly selects MGW-1 and MGW-2 as the MGW that is used to carry, to reach purposes such as sharing bearing load in turn.Certainly, in the practical application, if the MGW that has n while and MGC to link to each other with the wireless access side apparatus, then MGC can carry out polling in this n MGW.
Can adopt packet mode to connect between the network entity that directly links to each other on MGW-1/MGW-2 and the optional bearer path, as: synchronous transfer module (ATM) or IP mode.For the optional bearer path at MGW-1/MGW-2 place, the network entity that directly links to each other on the described optional bearer path is the network entities such as certain MGW that directly link to each other with MGW-1/MGW-2 in wireless access side apparatus or the bearer network.
Because the MGC MGW that generally adopts the mode of polling to be identified for carrying in the prior art, so, when variation has taken place in the connection status between the network entity that directly links to each other on MGW and the optional bearer path, still may be defined as the MGW that is used to carry by MGC, this may cause call drop.Such as: fault has taken place in the connection between MGW-1 and the wireless access side apparatus, can't normally receive signal.If but certain user terminal under this moment wireless access side apparatus makes a call, MGC receives call setup request message, and then MGC need be identified for carrying the MGW of this calling.If the order according to polling should be born this carrying task by MGW-1, then will to determine MGW-1 be the MGW that is used to carry to MGC, controls then and set up carrying between MGW-1 and the wireless access side apparatus.But in fact, can not finish the task of this calling, then must cause the loss of this calling because fault has taken place the connection between MGW-1 and the wireless access side apparatus.
This shows in the prior art, also do not have the method for the MGW that a kind of MGC is identified for carrying, can avoid call drop.
Summary of the invention
In view of this, main purpose of the present invention is to provide the method for the media gateway that a kind of Media Gateway Controller is identified for carrying, and can avoid call drop.
In order to achieve the above object, the technical scheme of the present invention's proposition is:
The method of the media gateway that a kind of Media Gateway Controller is identified for carrying, the connection status table is set in media gateway controller MGC, connection status between the radio network controller (RNC) that is used for directly linking to each other on recording medium gateway MGW and the optional bearer path, whether MGW changes according to the connection status between the RNC that directly links to each other on physical layer protocol real-time judge self and the optional bearer path, if, the connection status that then will carry the connection status situation of change changes request message and sends to MGC, MGC upgrades MGW connection status table according to the connection status situation of change, and this method also comprises:
MGC inquiry connection status table is determined a normal MGW of connection status, and with the MGW that determines as the MGW that is used to carry.
Preferably,
Described connection status is changed to: connect and change malfunction into by normal condition, perhaps change normal condition into by malfunction.
Preferably, being connected between the RNC that directly links to each other on MGW and the optional bearer path: synchronous transfer module ATM is connected or the IP mode connects.
Preferably,
This method further comprises: the state audit cycle is set in MGC;
MGC all MGW in the connection status table when the state audit cycle finishes send query State request messages, described all MGW to MGC return current self with bearer path on connection status situation between the network entity that directly links to each other.
Preferably, this method further comprises: the connection state reporting cycle is set in each MGW;
Each MGW when the connection state reporting end cycle to MGC report current self with bearer path on connection status situation between the network entity that directly links to each other.
In sum, the method of the MGW that a kind of MGC that the present invention proposes is identified for carrying, since can by MGW to MGC report self with optional bearer path on connection status situation of change between the network entity that directly links to each other, MGC can write down the connection status situation of change in the connection status table, and determine a normal MGW of connection status, thereby can avoid call drop according to the connection status table.
Description of drawings
Fig. 1 is typical MINI-IU-FLEX schematic network structure;
Fig. 2 is a system configuration schematic diagram of using the present invention program's embodiment;
Fig. 3 is an embodiment flow chart of using the present invention program.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
Basic thought of the present invention is: MGC determines a normal MGW of connection status according to the connection status table that is used to write down the MGW connection status, with the normal MGW of described connection status as the MGW that is used to carry.
Among the present invention, need in MGC, to be provided with in advance a connection status table that is used to write down the MGW connection status, all are recorded in the connection status table with the MGW that MGC links to each other with the wireless access side apparatus simultaneously, and the connection status initial value is set to normally.
Among the present invention, whether the MGW that is recorded in the connection status table changes the connection status of the network entity that directly links to each other on real-time judge self and the optional bearer path, if change, then report the connection status that carries the connection status situation of change to change request message to MGC, MGC is again according to the connection status table of this message real-time update self.After this, MGC just can select a normal MGW of connection status as the MGW that is used to carry according to the connection status table.
Connection status described here changes the two kinds of situations that comprise: a kind of situation be connection status by normally changing fault into, another kind of situation is for to be changed into normally by fault.
In the practical application, the network entity that directly links to each other on MGW and the optional bearer path can be the grouping connected mode, i.e. ATM connected mode or IP mode, and the port between the network entity that directly links to each other on the last and optional bearer path of MGW is atm port or IP port.Whether MGW can detect the signal of atm port or IP port according to physical layer protocol normal, if signal interruption that receives or step-out then are judged as the connection fault; Otherwise, be judged as connection normally.If the atm port of MGW or IP port be received signal normally, connection status between the network entity of just representing directly to link to each other on MGW and the optional bearer path is normal, otherwise fault has taken place in the connection status between the network entity of just representing directly to link to each other on MGW and the optional bearer path.That is to say, MGW can according to physical layer protocol judge self with optional bearer path on be connected whether variation has taken place between the network entity that directly links to each other.
For the present invention program is described better, the method for the MGW that MGC is identified for carrying is described with a preferred embodiment below.
Fig. 2 is a present embodiment system configuration schematic diagram.As shown in Figure 2, comprise first media gateway, second media gateway and the 3rd media gateway in the present embodiment, i.e. MGW-1, MGW-2, MGW-3; MGC links to each other with MGW-2 with MGW-1; The wireless access side apparatus is radio network controller (RNC), and RNC also links to each other with MGW-2 with MGW-1; MGW-1, MGW-2, MGW-3 link to each other by bearer network; Be connected by the ATM mode between MGW-1 and the RNC, the port that links to each other with RNC among the MGW-1 is an atm port; Be connected by the ATM mode between MGW-2 and the RNC, the port that links to each other with RNC among the MGW-2 is an atm port.
In the present embodiment, the media gateway of MGW-1 number is 111, the media gateway of MGW-2 numbers 222, and the signaling point code of RNC is 555.The media gateway of MGW-1 and MGW-2 number, and the signalling point of RNC numbering can be as the self networks entity identification.In the practical application, also can encode and identify RNC with global network.
In the present embodiment, MGW-1 is connected with ATM between the RNC and interrupts, and certain user terminal under RNC user terminal of certain in PSTN again makes a call.
Fig. 3 has shown that the flow process of the MGW method that present embodiment realization MGC is identified for carrying may further comprise the steps:
Step 301: MGW connection status table is set, and the connection status initial value is set to normally in MGC.
In the present embodiment, need in MGC, to be provided with in advance a connection status table that is used to write down the connection status of MGW-1 and MGW-2, and the connection status initial value of MGW-1 and MGW-2 is set to normally.In the present embodiment, the connection status table as shown in Table 1:
Numbering The MGW sign The RNC sign Connection status
1 111 555 Normally
2 222 555 Normally
Table one
In the present embodiment, other network entity that directly links to each other with MGW-1 or MGW-2 in the bearer network is not recorded in the connection status table.And in actual applications, other network entity that may also need directly to link to each other with MGW-1 or MGW-2 on the optional bearer path is recorded in the connection status table.Such as: MGW-4 is positioned on the optional bearer path in the bearer network, and directly links to each other with MGW-1, then MGW-4 also should be recorded in the connection status table.Whether MGW-1 also changes the connection status between real-time judge self and the MGW-4, if, then report MGC, upgrade the connection status table by MGC.Certainly, because described RNC and described MGW-4 are positioned on the optional bearer path, when then needing connection status between connection status, MGW-1 and the MGW-4 between MGW-1 and the RNC all to be in normal condition simultaneously, MGC could be with MGW-1 as the MGW that is used to carry.
In addition, in the practical application,, then need this n MGW is recorded in the connection status table if there be n MGW to link to each other with MGC with the wireless access side apparatus simultaneously.
Step 302:MGW-1 judge self with RNC between be connected and break down, with carry self media gateway number, the RNC signaling point code changes request message with the connection status that is connected fault message and sends to MGC.
In the practical application, whether the atm port that MGW-1 can real-time judge self connects RNC is normal, promptly whether can normally receive the signal of telecommunication, if then atm port is normal, promptly connects normal; Otherwise the atm port fault promptly connects fault.
Connection fault message described here is exactly the situation that a kind of connection status changes.In the practical application, can connect fault, connect normal with " 0 " expression with " 1 " expression.Certainly, in the practical application, can also change with " 1 " expression connection status, after MGC receives connection status change request message, just the connection status of this MGW correspondence in the connection status table can be changed into " fault " from " normally ", perhaps change into " normally " from " fault ".
Certainly, in actual applications, recover normal when being connected between MGW-1 and the RNC, MGW-1 just can with carry self media gateway number, the RNC signaling point code sends to MGC with the connection status change request message that is connected normal information.At this moment, described connection normal information also is a kind of connection status situation of change.
In the practical application, the connection status that MGW reports to MGC changes request message can be the Mc interface protocol message of expansion.
In addition, in the practical application, connected mode between the network entity that directly links to each other on MGW and the optional bearer path also can adopt the IP connected mode, so, whether MGW-1 and MGW-2 will judge normally whether connection status is normal according to the IP port of self, its method and present embodiment method are similar, repeat no more herein.
In a word, as long as when variation has taken place the connection status of the network entity that directly links to each other on MGW and the optional bearer path, all the connection status situation of change can be reported MGC.
The connection status that step 303:MGC sends according to MGW-1 changes request message and upgrades MGW connection status table.
This is in real time in example, the MGW connection status table after MGC upgrades as shown in Table 2:
Numbering The MGW sign The RNC sign Connection status
1 111 555 Fault
2 222 555 Normally
Table two
Step 304:MGC inquiry MGW connection status table, and the normal MGW-2 of definite connection status is as the MGW that is used to carry.
In the present embodiment, after the step 303, set up request message if MGC receives from caller calls, MGC will set up the task of bearer path, can determine to connect normal MGW-2 as a MGW who is used to carry according to the connection status table.That is to say that after bearer path was set up, RNC, MGW-2, MGW-3, PSTN will form the path of carrying this calling.Belong to prior art as for how setting up bearer path, present embodiment repeats no more.
In actual applications, MGC receives from caller calls and sets up request message and the connection status that receives from MGW changes request message not smoothly successively, be separate between the two, determine a MGW who is used to carry as long as MGC inquires about the connection status table when receiving call setup request message.
In addition, in the practical application, for the connection status that guarantees the connection status table record and the actual connection status of MGW-1 and MGW-2 are consistent, the state audit cycle can be set in MGC, and when each state audit cycle finishes, sending the query State request message to MGW-1 and MGW-2, MGW-1 and MGW-2 return connection status situation between separately current and the RNC to MGC respectively.
Certainly, in the practical application, can also be set the connection state reporting cycle in MGW-1 and MGW-2, MGW-1 and MGW-2 report connection status situation between current self and the RNC to MGC respectively when each connection state reporting end cycle.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (5)

1, the method of the media gateway that a kind of Media Gateway Controller is identified for carrying, it is characterized in that, the connection status table is set in media gateway controller MGC, connection status between the radio network controller (RNC) that is used for directly linking to each other on recording medium gateway MGW and the optional bearer path, whether MGW changes according to the connection status between the RNC that directly links to each other on physical layer protocol real-time judge self and the optional bearer path, if, the connection status that then will carry the connection status situation of change changes request message and sends to MGC, MGC upgrades MGW connection status table according to the connection status situation of change, and this method also comprises:
MGC inquiry connection status table is determined a normal MGW of connection status, and with the MGW that determines as the MGW that is used to carry.
2, method according to claim 1 is characterized in that, described connection status is changed to: connect and change malfunction into by normal condition, perhaps change normal condition into by malfunction.
3, method according to claim 1 is characterized in that, being connected between the RNC that directly links to each other on MGW and the optional bearer path: synchronous transfer module ATM is connected or the IP mode connects.
4, according to each described method of claim 1 to 3, it is characterized in that this method further comprises: the state audit cycle is set in MGC;
MGC all MGW in the connection status table when the state audit cycle finishes send query State request messages, described all MGW to MGC return current self with bearer path on connection status situation between the network entity that directly links to each other.
According to the described method of claim 1 to 3, it is characterized in that 5, this method further comprises: the connection state reporting cycle is set in each MGW;
Each MGW when the connection state reporting end cycle to MGC report current self with bearer path on connection status situation between the network entity that directly links to each other.
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CN1452347A (en) * 2002-04-20 2003-10-29 深圳市中兴通讯股份有限公司 Method for detecting medium gateway controller and medium between-gateways link state
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CN1588927A (en) * 2004-08-05 2005-03-02 北京航空航天大学 Method for large scale multimedia cut-in net gate

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