CN1855897A

CN1855897A - Interconnection between domains

Info

Publication number: CN1855897A
Application number: CN 200510069416
Authority: CN
Inventors: 林扬波
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2005-04-29
Filing date: 2005-04-29
Publication date: 2006-11-01
Anticipated expiration: 2025-04-29
Also published as: CN100486233C

Abstract

A method to achieve the intercommunication between IP territories, including: when determining to establish the media stream by the IP territories MG (media gateway), first, MGC (media gateway controller) sends the ending descriptor information to MG (media gateway) in order to getting the needing IP territories information of the establishing media stream, then, uses the IP territories information to establish the IP territories media stream. Achieving the invention, the MG of the needing intercommunication IP territories get the IP territories information of the establishing media stream, ensure to achieve the intercommunication between the needing intercommunication IP territories.

Description

Realize the method for IP inter-domain intercommunicate

Technical field

The present invention relates to network communications technology field, relate in particular to a kind of method of the IP of realization inter-domain intercommunicate.

Background technology

The networking structure of NGN (next generation network) as shown in Figure 1, MGC (Media Gateway Controller) and MG (media gateway) are two key members among the NGN.Wherein, MGC is responsible for CCF, and MG is responsible for the service bearer function, realize by this calling out separating of control plane and service bearer plane, thus abundant shared network resource, simplified apparatus upgrading and professional expansion reduce development and maintenance cost greatly.

MGCP is the main agreement of communicating by letter between MG and the MGC, at present widely used comprising: H.248/MeGaCo with two kinds of MGCPs of MGCP.Wherein, the MGCP agreement is worked out and is revised in January, 2003 in October, 1999 by IETF, and H.248/MeGaCo agreement is revised in common formulation of in November, 2000 and in June, 2003 by IETF and ITU.

With agreement H.248 is example, and the various resources on the MG are terminal (Termination) by abstract representation.Terminal is divided into physical terminal and ephemeral terminations again, on behalf of some, the former have the physical entity of semipermanent existence, TDM (time division multiplexing) passage etc. for example, the public resource that on behalf of some provisional application, the latter discharge with the back, for example RTP (RTP) stream etc.Combination between the terminal is context (Context) by abstract representation.Context can comprise a plurality of terminals, thereby describes the correlation of terminal room with topology (Topology).

Based on this abstract model of agreement, in fact continuing of calling be exactly to terminal and contextual operation.Described operation is finished by the order between MGC and the MG (Command) request and response.Order entrained parameter, be also referred to as descriptor (Descriptor), be divided into attribute (Property), signal (Signal), incident (Event), statistics classifications such as (Statistic).Parameter with professional correlation polymerization in logic becomes bag (Package).

According to agreement H.248 as can be known, the context topological structure of its definition itself is to terminal type and insensitive.Promptly constituting contextual terminal can be any physical terminal (for example TDM passage) or ephemeral terminations (for example rtp streaming).With regard to a two-way media stream, can be for common IP telephone service by a TDM physical terminal and interconnected carrying of RTP ephemeral terminations, can be for intra-office TDM telephone service by two interconnected carryings of TDM physical terminal, can be for the IP-IP interworking service by two interconnected carryings of RTP ephemeral terminations.

H.248 the archetype of agreement is the MGC-MG control relation in single IP territory.Media Stream is normally transmitting between TDM physical terminal and RTP ephemeral terminations on the common MG.Yet in actual applications, each operator need also may need to realize to each other striding the intercommunication in IP territory except MG is arranged intercommunication under the MGC control in IP territory separately.

But, owing to needing the rtp streaming in different IP territory is together in series in same context under the situation of striding the intercommunication of IP territory in realization, for realizing that this purpose then need need to know relevant IP domain information on the MG that creates corresponding rtp streaming, so that determine to create the direction of Media Stream.That is to say,, then can't create corresponding rtp streaming at all if on corresponding M G, can't obtain corresponding IP domain information.And also do not have a kind of technological means promptly on MG, also can't obtain at present and to create the IP domain information that rtp streaming needs at present really so that on the MG of needs realization IWF, can obtain the IP domain information of the rtp streaming of establishment.

Summary of the invention

In view of above-mentioned existing in prior technology problem, the method that the purpose of this invention is to provide a kind of IP of realization inter-domain intercommunicate, thereby make that realizing striding the IP territory at needs creates the MG of Media Stream (for example RTP Media Stream) and go up and can obtain corresponding IP domain information, with the intercommunication of realization based on the IP territory in the network of MGCP.

The objective of the invention is to be achieved through the following technical solutions:

The invention provides a kind of method of the IP of realization inter-domain intercommunicate, comprising:

The opposite end descriptor information that media gateway MG receiving media gateway controller MGC between A, IP territory sends;

B, MG analyze described opposite end descriptor information, obtain and create the IP domain information that Media Stream needs;

C, MG utilize the Media Stream between described IP domain information establishment IP territory.

Described opposite end descriptor information comprises: the IP address information.

Described step B comprises:

MG relatively determines to create the IP domain information of Media Stream needs according to IP address information in the descriptor of opposite end and the local IP domain information of preserving.

Among the present invention, step C constructs the local terminal descriptor simultaneously based on Media Stream between described IP domain information establishment IP territory.

Described IP domain information comprises: the IP domain addresses constitutes.

Described step B also comprises:

When MG can't resolve the IP domain information that obtains establishment Media Stream needs according to the opposite end descriptor information, then create the Media Stream failure, and return error message to MGC.

Described error message can be error code.

As seen from the above technical solution provided by the invention, realization of the present invention makes in NGN, need the MG between the IP territory of intercommunication need to obtain IP domain information under the Media Stream stream (for example RTP Media Stream) of its establishment from MGC, thereby need having guaranteed can realize intercommunication between the IP territory of intercommunication, for the operation management of each network provides greatly convenient.

Description of drawings

Fig. 1 is MG and a MGC networking structure schematic diagram among the NGN;

Fig. 2 is an IP territory intercommunication networking structure schematic diagram among the NGN;

Fig. 3 is the flow chart of method of the present invention;

Fig. 4 utilizes the present invention to carry out the process schematic diagram that Media Stream is created;

Embodiment

IP cross-domain inter communication MG networking schematic diagram wherein is arranged at the MG that needs between the IP of intercommunication territory and is called IP cross-domain inter communication MG or IP-IP MG (MG between the IP territory) as shown in Figure 2 among the NGN.Be with the difference of common MG: common MG is in the position of UNI (User Network Interface), and IP-IP MG is in the position of NNI (Network-Node Interface).Correspondingly Media Stream also is being to transmit between corresponding ephemeral terminations on the IP-IP MG.

In order to realize that Media Stream strides the intercommunication in different IP territory, described IP-IP MG need understand the IP domain information under it when creating a Media Stream.Core concept of the present invention is to extract the IP domain information that IP-IP MG needs by agreement remote descriptors is H.248 analyzed, thereby make IP-IP MG need can obtain the affiliated IP domain information of Media Stream of establishment comparatively easily, so that create corresponding Media Stream exactly.

For the present invention there being further understanding, the specific implementation of method of the present invention is done detailed explanation below in conjunction with accompanying drawing.

Method of the present invention as shown in Figure 3, specifically comprises following process when specific implementation:

Step 31:MGC determines and need issue the indication of establishment Media Stream to MG;

The MG of step 32:MGC between the IP territory sends the opposite end descriptor information;

MGC indication MG add terminal in context when creating Media Stream, the feature of terminal that need interpolation is described with LocalControl (local terminal control), Local (local terminal) and Remote descriptors such as (opposite ends) usually;

Wherein, Local describes the codec parameters that local terminal receives (also being that the opposite end sends) Media Stream; Remote describes the codec parameters that the opposite end receives (also being that local terminal sends) Media Stream, for example IP address port, code decode algorithm, packaging time length etc., and these parameters adopt the form of SDP (Session Description Protocol) to organize;

Described LocalConatrol describes and then comprises Mode (pattern), ReserveGroUp (reservation group) and ReserveValue (reserved value), and other attribute relevant with stream that defines in bag; Wherein, Mode describes the state that Media Stream externally shows on this terminal, can be, receipts, transmitting-receiving, deactivation, loopback; Whether ReserveGroup and ReserveValue describe on this terminal the media stream code/decode resource requirement and reserve.

The opposite end descriptor information of the Media Stream to be created that step 33:MG analysis MGC sends, to obtain corresponding IP domain information, described IP domain information comprises that the IP domain addresses constitutes;

Have coupled relation owing to describe the Local and the Remote of Media Stream in single IP territory, also promptly the local terminal of this Media Stream has identical IP address formation with the opposite end, is specially: identical subnet+different main frame or identical subnet and main frame+different port;

And for IP-IP MG, terminal of carrying media stream is definite on it, after normally the terminal of the same Media Stream of carrying is determined on the common MG in opposite end; Therefore MGC indication IP-IP MG add terminal in context when creating Media Stream, can provide detailed Remote information usually, and IP-IPMG can obtain corresponding Local according to the analysis to described Remote;

Just for these reasons, therefore, the present invention is just by extracting the IP domain information as the basis that makes up the Local descriptor from the Remote descriptor analysis of agreement H.248, so that create the Media Stream at this IP territory.

Step 34: after having obtained the IP domain information that the RTP Media Stream of corresponding establishment needs, just can create corresponding Media Stream, construct the local terminal descriptor simultaneously according to described IP domain information.

In conjunction with Fig. 4 concrete application of the present invention is further described again below.

At first, MGC is mutual with the common MG that is in UNI, to obtain the RTP parameter of the terminal of this Media Stream of carrying on it.

Afterwards, MGC indicates the optional suitable terminal of the IP-IP MG that is in NNI to carry this Media Stream (undetermined with the RTP parameter of " $ " expression terminal in the Local descriptor), simultaneously, MGC provides common MG to go up the RTP information of the terminal of this Media Stream of carrying to IP-IPMG, specifically it is carried in the Remote descriptor.

Described IP-IP MG receives the Remote descriptor, and the IP domain information that therefrom extracts corresponding IP address information and the possible intercommunication of own preservation compares; If the IP address of extracting belongs to wherein certain IP territory, then choose suitable terminal and carry this Media Stream at this IP territory operation, promptly create corresponding rtp streaming; If this IP address does not belong to wherein any IP territory, then create the rtp streaming failure and return the corresponding error sign indicating number to MGC.

After IP-IP MG has created corresponding rtp streaming, the RTP parameter of carrying the terminal (being local terminal) of this Media Stream on it is fed back to MGC, specifically be carried in the Local descriptor and send to MGC.

After MGC obtains the RTP parameter information of the terminal of the corresponding rtp streaming of carrying on the IP-IP MG, provide the RTP information of the terminal of this Media Stream of carrying on the IP-IP MG, thereby realize the intercommunication between the IP territory in the NGN network to common MG.

The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims

1, a kind of method that realizes the IP inter-domain intercommunicate is characterized in that, comprising:

2, according to the method for right 1 described realization IP inter-domain intercommunicate, it is characterized in that described opposite end descriptor information comprises: the IP address information.

3, the method for realization IP inter-domain intercommunicate according to claim 1 and 2 is characterized in that described step B comprises:

4, the method for realization IP inter-domain intercommunicate according to claim 3 is characterized in that, step C constructs the local terminal descriptor simultaneously based on Media Stream between described IP domain information establishment IP territory.

5, the method for realization IP inter-domain intercommunicate according to claim 1 and 2, it is characterized in that described IP domain information comprises: the IP domain addresses constitutes.

6, the method for realization IP inter-domain intercommunicate according to claim 3 is characterized in that described step B also comprises:

7, the method for realization IP inter-domain intercommunicate according to claim 6 is characterized in that described error message can be error code.