CN1372416A - Soft exchange based video conference system multipoint controller - Google Patents
Soft exchange based video conference system multipoint controller Download PDFInfo
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- CN1372416A CN1372416A CN 02115659 CN02115659A CN1372416A CN 1372416 A CN1372416 A CN 1372416A CN 02115659 CN02115659 CN 02115659 CN 02115659 A CN02115659 A CN 02115659A CN 1372416 A CN1372416 A CN 1372416A
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Abstract
This invention relates to a multi-points control unit (MCU) of a video conference system based on the network soft exchange structure system of the next generation with the characteristics of applying the layer interface technology of the soft exchange standard and normalize the separation of the functional modules of the multi-points controller in MCU of the video conference system and the multi-poitns processor to put them in the third and fourth layers in the mext generation of a network system structure and to broadcast or organize the broadcasting into the network in the way of stream medium of the images, sounds and data of video conferences by introducing the stream medium technology so as to meet the needs of products of telecommunication video conference with large volume and high reliability.
Description
Technical field
The invention belongs to the video conference system multipoint controller that satisfies next generation network, is a kind of video conference system multipoint controller based on soft switch concretely.
Background technology
Video conferencing system can provide the multimedia communication service that integrates voice, video, data, and its appearance is very easy to people's exchanges and communication, becomes the important actuating force of Communications Market.Up to the present, telecommunications enterprise does not also form scale to the development of whole video conference system, and the video conferencing system operation of carrying out towards the public will be trend of the times undoubtedly.As modern communications equipment exploitation enterprise, we catch this favourable opportunity by the innovation of technology and operation, start to develop video conferencing system towards the public.
The benefit of at first bringing for the user of carrying out of public's video conference is to have saved the major part investment of building video network, has saved a large amount of maintenance costs, helps further carrying out of video traffic; Then the video conference socialization can be carried out independently price policy for telecommunications enterprise, realize real network value added.The while what is more important, carrying out of public's video conference business will help telecommunications enterprise to win more business user, enterprise-class tools, even can cover gradually to the domestic consumer, expand value-added space to greatest extent.See that conversely if public's video traffic that telecommunications enterprise can not in time provide convenience under the promotion of demand, certainly will have the video network of increasing industry, enterprise's construction oneself, this will be a kind of repeated construction, cause the wasting of resources.After the construction of enterprise's video conference network takes on a certain scale, telecommunications enterprise just will lose this market.As seen, carrying out of public's video conference business not only has its necessity, also has suitable urgency simultaneously.To carry out public's video conference business effectively, see, remain in some shortcomings with regard to traditional appointed condition.Wherein, the deficiency of multipoint control unit function is one of key factor that influences the development of public's video conference business.
In traditional video conferencing system, multipoint control unit MCU (Multipoint Control Unit) is used to support the meeting of three above endpoint devices.Can be linked to be net to a multi-spot video conference system by MCU.Usually, the function of MCU is the audio signal of mixing multiple spot, from each the road vision signal that receives, select a road required vision signal, and make above-mentioned data-signal, audio signal, the vision signal that be sent to each relevant meeting-place mix compound output signal of composition mutually.This system exists has wasted the network bandwidth, and video conferencing system can't satisfy the defective that carrier class public video conferencing system requires aspect practicality.
Summary of the invention
The purpose of this invention is to provide a kind of network bandwidth of both having saved, enlarged its meeting scope again, made video conferencing system can really satisfy the video conference system multipoint controller based on soft switch of application demand of the carrier class network of big capacity, high reliability, to overcome above-mentioned deficiency.
To achieve these goals, characteristics of the present invention are that it forms the video conferencing system multipoint control unit by aaa server, LIST SERVER, media server, media gateway controlling unit, wherein aaa server, LIST SERVER, media server are connected with each Media Gateway Controller respectively, and media server also is connected with external each video conference terminal respectively;
Above-mentioned media server is made up of a main control module and a plurality of media server module;
Above-mentioned each media server module includes a plurality of CPU, internal memory, I/O chip, media data storage;
Above-mentioned aaa server is connected with each Media Gateway Controller respectively by RADIUS communication protocol;
Above-mentioned LIST SERVER is connected with each Media Gateway Controller respectively by LDAP communication protocol;
Above-mentioned media server is connected with each Media Gateway Controller respectively by SIP communication protocol, and is connected with external each video conference terminal respectively by RTP communication protocol;
Be connected to each other by SIP-T communication protocol between above-mentioned each Media Gateway Controller;
The output of above-mentioned each Media Gateway Controller all is circumscribed with the video conference terminal by communication protocol H.248.
In the present invention, at first by introducing soft switch (softswitch) structural system and a whole set of protocol specification thereof, multipoint controller functional module in the video conferencing system multipoint control unit (MCU) is placed in next generation network NGN (the Next Generation Network) architecture the 3rd layer, realizes with the media gateway controlling technology; Multipoint processor functional module in the multipoint control unit (MCU) is placed in next generation network (NGN) architecture the 4th layer, waits with media server and application server and realize; By adopting the interlayer interface technology and the standard of soft switch standard, make multiple spot control function module and multiple spot processing capacity module can realize linear expansion.Secondly, under soft switch (softswitch) structural system, by introducing stream media technology, video conferencing system can be by actual user's customized demand, broadcast or multicast in network in the mode of Streaming Media image, the voice and data of video conference, thereby both saved the network bandwidth, enlarged its meeting scope again.Based on the video conference system multipoint controller of Softswitch technology by controlling and service detach (be about to signaling process handle separate) with medium, both solved traditional problem that becomes the whole system bottleneck based on the video conferencing system multipoint control unit of ITU standard, solved again based on the video conferencing system of ietf standard satisfying the defective that carrier class public video conferencing system requires aspect the practicality, made video conferencing system can really satisfy the application demand of the carrier class network of big capacity, high reliability.
The present invention is decomposed into media server MS (Media Server) and two parts of media gateway controller MGC (Media Gateway Control) with multipoint controller by its major function, wherein media server MS only is responsible for medium and handles the bearing interface between processing and media gateway; The basic functions of Media Gateway Controller is to call out control and resource management function for media gateway provides.Set up information such as request and link release according to the connection that video conference terminal sends, a MGC can manage the call control procedure of hundreds of video conference terminals.Media server of the present invention and Media Gateway Controller are logically separated from one another, and the interface between them adopts Session Initiation Protocol to communicate.Realized separating of business and control.
Description of drawings
Fig. 1 is a structural framing schematic diagram of the present invention.
Fig. 2 is the frame structure schematic diagram of media server of the present invention.
Fig. 3 is a media server module structural representation of the present invention.
Fig. 4 is a Media Gateway Controller hardware implementation framework schematic diagram of the present invention.
Embodiment further specifies the present invention below in conjunction with accompanying drawing.The specific embodiment of the present invention is:
1. big capacity media server system
In based on the carrier-class soft switchcall server, power system capacity is a very crucial system performance index.In present stage, single MCU disposal ability is generally 64 tunnel video informations.In order to solve the media gateway system capacity problem, need research large-capacity video signal DSP treatment technology and high-performance CPU application technology.Wherein, high-performance CPU mainly handles real-time control transmission agreement and based on H.248 MGCP.
2, NLB technology
Can finish the media server that the video conference terminal user is connected and have a plurality ofly, the soft switch controller needs to be grasped media server and the accurate availability of grid, so that do the equilibrium of traffic carrying capacity between media server.This is the problem that catenet must solve.
3. based on the network management of strategy
The legacy network management is managed no real-time based on static management, has been difficult to real-time for catenet.And tactical management is based on dynamic management, carries out network management by Policy Server automatically according to the strategy of customization in advance, manage real-timely, and comprehensively various factors reacts effectively and timely to the whole network.
4. directory services functionality
Internet is unlike Circuit Switching Network, and it does not have unified addressing mechanism, also has the covert problem in fire compartment wall and address in addition, so directory service is the emphasis problem that will solve in the distributed conference system.
One, media server
TV conference system is to be numerous users' services, and user's request is at random, and it also is at random that system asks number sometime user, and this just requires system must handle the concurrent request of a large number of users simultaneously.Media server in the carrier class TV conference system must solve two sixty-four dollar questions: the user asks to handle problems and the media data storage problem.Ask to handle problems for the user, require streaming media server to have the MPP ability, can support thousands of user's concurrent request; For the storage problem, require the memory space of streaming media server to reach 1-10TB, to satisfy hundreds and thousands of hours storage demand of system flow media data.
The mode of operation of media server is behind the video flowing of server customer in response, reads in a part of video data to the specific buffer memory corresponding to this video flowing from storage system, and the content in this buffer memory is sent into network interface and sent to the client then.When a new client requests Video service, server is according to the operating position of system resource, and whether decision responds this request.The resource of system comprises the utilization rate of the bandwidth, the network bandwidth, memory size and the CPU that store I/O.
Media server is made up of master control service system, basic media services modular unit, internal module interlinkage communication network.The most basic unit is the media services modular units, each modular unit has a plurality of CPU, multi-channel network output interface, support access networks such as IP, ATM, HFC, each modular unit has the FC/SCSI passage and links to each other with External memory equipment, each module provides many connection communication links simultaneously, be used for the interconnection of a plurality of basic media services modular units, come the number of customized module unit according to user's demand.
Stream media system has a plurality of basic media services modular units, need serve control and scheduling to these modular units, the master control service system is taken on this task, because system needs the processing of multiple complexity such as balanced load, fast dispatch, control of authority when operation, these processing need be finished by special process or system.The frame structure of whole media server as shown in Figure 2.
Streaming media server must possess extensive disposal ability, the server of traditional architectures can't reach this requirement, therefore, streaming media server is the mode that adopts a plurality of processing module distributed interconnections, each processing module all has CPU, internal memory, storage I/O and network I/O, module interconnects router, the module interconnects communication bus of oneself, and typical processing module structure as shown in Figure 3.
The protocol stack that the present invention realizes on media server:
H.32 3 protocol stacks
SIP
MGCP, the MEGACO/H.248 medium are supported:
Full code conversion of audio frequency Codecs:G.711/G.722/G.723.1/G.729AB/GSM and bit rate coupling
The voice speech activity is surveyed, quiet inhibition
Video Codecs:H.261/H.263, MPEG-4
Support the host-host protocol of Streaming Media: RTP/RTCP, RTSP, RSVP
Two, Media Gateway Controller (MGC)
Media Gateway Controller carry out to video conference system terminal and and the control of media server, be responsible for handling resource management and registration.
MGC manages a plurality of terminals, plays the call load control action of terminal.MGC has the RAS of protocol stack H.323, the H.225.O agreement and the processing capacity of agreement H.245, and supports the processing to the MGCP/H.248 agreement.MGC also provides the standard interface with intelligent network, and the processing of miscellaneous service is provided.Media Gateway Controller is that the important component part and the function of soft switch realizes part.Pass through H.323 between the MGC or the Session Initiation Protocol connection.Media Gateway Controller hardware implementation framework figure such as Fig. 4.
The protocol stack that the present invention realizes on Media Gateway Controller:
Call out and connect medium control: H.248/MGCP, SIP, H.323
Far-end camera control: H.281
Meeting control: H.243
Three, LIST SERVER
Also comprise the functional form server that some support various tasks among the present invention.AAA (authentication, mandate, charging) server is being played the part of important role in the carrier class dial-up access scheme of Next Generation Internet network scheme, it provides the work of authentication, mandate, charging for the user who dials up on the telephone.LIST SERVER is registered function with route etc. for the IP terminal use in the Next Generation Internet network provides the user, support aaa server to visit the customer data base on this backstage by ldap protocol, comprised dial-up user's number of the account and user's data such as register information H.323 here.
Directory service is all very important in concentrated and distributed meeting.Node is identified by fixed number in the Circuit Switching Network, and node is identified by the IP address in the packet switching network.In the heterogeneous network, E.164 the ATM node by identifying, and POT and ISDN node are identified by telephone number, and the internet node, will be brought great convenience if directory service can convert meeting participant's name to physical address by the IP address designation.In mobile communication, the convention goer may use dynamic address from the different local Internet that insert, and it is necessary that LIST SERVER seems.If the user in the fire compartment wall does not want the IP address that sticks one's chin out, the function of directory service will be more complicated.
Internet DNS (DNS) is a kind of distributed directory service solution, but common DNS system does not support the IP address of dynamic assignment.The IP address of dynamic assignment that the dynamic IP addressing query scheme requires to have a real-time enrollment mechanism to obtain the user when logining.Existing real-time registration protocol has SDP at present, LDAP, (distributed) such as DNS that safety dynamically updates.Internet database provider also provides special-purpose real-time registration protocol (centralized) for various application.Centralized solution easily realizes, but autgmentability is poor, and requires all conference members also unlikely to same service provider's registration.Distribution mode facts have proved that based on the DNS system is arranged it is stable, and autgmentability is good.The DNS that safety dynamically updates is exactly desirable a selection.
Other advantages of the present invention:
Adopt open architecture, closely follow the recent design thought of IP network, and the medium processing is separated with signaling process, make the flexible superposition of each functional module.
When design system, in order to satisfy high reliability, the less trouble requirement that carrier class is used, adopt high availability (HA) mechanism, hot plug, the heat of back-up system are switched and Hot Spare fully from hardware, provide a cover mechanism to make simultaneously on software design, also can to realize the backup of data fully and switch, thereby can reach 99.999% system reliability.Simultaneously also realized load sharing mechanism, made the data traffic science be distributed in each processor.
On system redundancy mechanism, at first adopt the redundancy backup design, simultaneously drawing high availability (HA) technology that in the CompactPCI system, proposes on the hardware, guaranteed on systems soft ware, also can realize reliable back mechanism, satisfy the hot-swap and the backup of hardware and software, thereby can realize system reliability up to 99.999%.Adopted the function that a kind of and traditional OA M system are diverse, finish the operation back-up system based on the implementation of strategy (Policy-based), according to certain strategy to network characteristic carry out in real time, intelligence, centralized adjustment and intervention, to guarantee the stability and the reliability of whole system.
The agreement and the interface of support of the present invention are seen attached list: subordinate list
| The consensus standard of supporting | Support H.323 protocol suite, comprising: H.225.0, H.245, RTP/RTCP etc.Gateway decomposes agreement: MGCP, H.248 waits.Encoding and decoding speech agreement: G.723.1, G.729A, G.729B, G.711, G.726, G.727 wait.Echo suppresses agreement: G.168 etc.Security protocol: H.235, Radius, SNMP etc.Routing Protocol: RIP, RIPII, OSPF etc.Signaling method: support ISUP, TUP, DSS1, cno.1, R2 etc. *Real time transport protocol: RTP, RTCP, RTSP, RSVP |
| The interface of supporting | With network interface: self adaptation 10M/100M Ethernet interface, gigabit ethernet interface, 155M/622M atm interface, 155M/622M pos interface.With PSTN interface: E1/T1, ISDN PRI, analog subscriber, digital subscriber, SDH STM-1.Pstn signaling interface: cno.1 signaling, Signaling System Number 7, TRK (loop trunks), ISDNPRI.With the standard interface of mobile signaling protocol net, comprise MISUP, MTUP, PRI, cno.1, R2 etc.Interfaces such as E1/T1/PRI that docks with GMSC, MSC and SDH 155M optical fiber.The analog subscriber line interface |
Claims (8)
1, a kind of video conference system multipoint controller based on soft switch, it is characterized in that: it forms the video conferencing system multipoint control unit by aaa server, LIST SERVER, media server, a plurality of media gateway controlling unit, wherein aaa server, LIST SERVER, media server are connected with each Media Gateway Controller respectively, and media server also is connected with external each video conference terminal respectively.
2, according to the described video conference system multipoint controller based on soft switch of claim 1, it is characterized in that: media server is made up of a main control module and a plurality of media server module.
3, according to claim 1 or 2 described video conference system multipoint controllers based on soft switch, it is characterized in that: each media server module includes a plurality of CPU, internal memory, I/O chip, media data storage.
4, according to the described video conference system multipoint controller based on soft switch of claim 1, it is characterized in that: aaa server is connected with each Media Gateway Controller respectively by RADIUS communication protocol.
5, according to the described video conference system multipoint controller based on soft switch of claim 1, it is characterized in that: LIST SERVER is connected with each Media Gateway Controller respectively by LDAP communication protocol.
6, according to the described video conference system multipoint controller of claim 1 based on soft switch, it is characterized in that: media server is connected with each Media Gateway Controller respectively by SIP communication protocol, and is connected with external each video conference terminal respectively by RTP communication protocol.
7, according to the described video conference system multipoint controller of claim 1, it is characterized in that: be connected to each other by SIP-T communication protocol between each Media Gateway Controller based on soft switch.
8, according to the described video conference system multipoint controller based on soft switch of claim 1, it is characterized in that: the output of each Media Gateway Controller all is circumscribed with the video conference terminal by communication protocol H.248.
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| WO2012126336A1 (en) * | 2011-03-18 | 2012-09-27 | 中兴通讯股份有限公司 | Method and system for providing conference call function for common terminal |
| CN103108150A (en) * | 2011-11-15 | 2013-05-15 | 中国电信股份有限公司 | Method for realizing intercommunication between video conference systems and video conference systems |
| CN103108150B (en) * | 2011-11-15 | 2016-03-23 | 中国电信股份有限公司 | Realize the method and system of intercommunication between video conferencing system |
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