CN1297309A - Method for increasing capacity of video conference system - Google Patents
Method for increasing capacity of video conference system Download PDFInfo
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- CN1297309A CN1297309A CN 00114057 CN00114057A CN1297309A CN 1297309 A CN1297309 A CN 1297309A CN 00114057 CN00114057 CN 00114057 CN 00114057 A CN00114057 A CN 00114057A CN 1297309 A CN1297309 A CN 1297309A
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Abstract
A method for increasing the capacity of video conference system features that in signaling interaction procedure, after the normal power exchange between local MCU and the MCU at higher level is finished, any MCU signaling representing itself is not transmitted in the transmitting direction at the port and the similar incoming signalings are not processed in the receiving direction at the port. For other ports, the local MCU plays normal role. Its advantage is no need of reforming original system.
Description
The invention belongs to the video conference field, relate in particular to a kind of method of enlarged meeting television system capacity.
Common TV conference system mainly comprises as shown in Figure 1: terminal equipment, transmission channel and multipoint control unit (MCU).Mutual communication when the meeting that multipoint control unit (MCU) is used for a plurality of places is carried out simultaneously is arranged on network node (tandem exchange) usually and locates, and is the key equipment of TV conference system.
Wherein MCU as shown in Figure 2, it comprises: Network Interface Module, audio processing modules, video processing module, data processing module, control treatment module.In TV conference system, MCU is as follows to the processing procedure of information flow:
1, the Network Interface Module of MCU is by the information flow of each port reception from each terminal (meeting-place), and these information flows are carried out separated in synchronization, extract audio frequency, video, data and signaling, again they are sent into audio processing modules respectively, video processing module, data processing module and control treatment module.
2, the control treatment module of MCU orders other each processing module to finish corresponding audio mix or processes such as switching, video mix or switching, data broadcasting and Route Selection after the signaling of comprehensive each port.
3, the information flow after other each processing module of the control treatment module order of MCU will be handled is exported to Network Interface Module, by Network Interface Module information flow is reconfigured, and is sent to corresponding meeting-place terminal system equipment by each port.
For finishing the purpose that multipoint conference is controlled, control treatment module can be selected the various control pattern for use, and the general at present control model that adopts has: sound control mode, chairman's control mode etc.Wherein, the sound control mode is meant the height of each terminal (meeting-place) volume of being brought according to its audio process by the control treatment module of MCU, the video image of which terminal of decision broadcasting; Chairman's control mode is meant the video image by that terminal of chairman's terminal decision broadcasting.These control modes are because the control point is particular terminal or is main MCU that being referred to as them here is " centralized control ".
On each meeting field point region in the TV conference system, disperse very much or each meeting field point more for a long time, as shown in Figure 3, can consider to adopt the networking of a plurality of MCU cascade, work in coordination with the processing of finishing whole conference system information flow.Under this networking mode, Signalling exchange in the TV conference system between existing MCU and the terminal, Signalling exchange between MCU and the MCU is arranged again, it is terminal or MCU that the processor controls of MCU can be distinguished the other side according to the signaling that the other side sends over, thereby take different processing procedures, this moment, control model generally adopted chairman's control mode.
H.320, ITU-T is defining narrow-band television telephone system and terminal equipment thereof in the suggestion, and this suggestion is the framework suggestion of video conferencing and video-phone system.Wherein H.243 suggestion has defined the communication control procedure between each terminal equipment (comprising MCU).H.243, the ITU-T in July, 1997 advises spelling out in the 5.7.2.3 clause: " for the directly continuous networking situation of main MCU of getting along well from MCU; each MCU must have MIH (Multi-point Indicate Hierarchy; the expression we support multistage cascade) ability; ...; if main MCU is not in the central authorities of MCU cascade network, be under the situation of its root that may appear at tree network, when the cascade level surpasses three layers, because the time-delay accumulation in BAS (Bit-rate Allocation Signal) the sign indicating number processing procedure, unless (T.120 suggestion is the standard that is used for the data conferencing system that ITU-T formulates to adopt T.120 suggestion, it can provide bigger signalling bandwidth) the conference control party formula, this clause is with inoperative ".This explanation, the video conferencing net can be realized multistage cascade, but requires each MCU must have the MIH ability, and must adopt the T.120 conference control party formula of suggestion.
Existing video conferencing net generally adopts single-stage or the networking of secondary cascade, expand the video conferencing range of application, just need carry out dilatation to existing TV conference system.Dilatation has two kinds of approach, and a kind of is the tape terminal ability that enlarges existing MCU, promptly increases the port number of each MCU; Another kind is to adopt multistage cascade.Usually, MCU is when creating, just its maximum port number that can support is definite, as adopts this mode that system is carried out dilatation, must replace this equipment.Existing video conferencing net is not because each MCU generally possesses MIH (Multi-point Indicate Hierarchy, the expression we support multistage cascade) ability and ability T.120, thereby can not adopt the conference control party formula of T.120 advising; As adopting multistage cascade mode that it is carried out dilatation, want to reach the T.120 requirement of suggestion, also must transform it.
Early stage video conferencing net is because cascade is no more than secondary, and port number that each MCU is with is also less, so power system capacity is all little, and in this case, the employing chairman controls this centralized control can realize management to whole meeting net easily.But along with the continuous expansion of power system capacity, existing centralized control more and more exposes following shortcoming:
1, it is more and more heavier to start to control operating personnel's the workload of the terminal of making usefulness;
2, the load of main MCU is increasing, and the control personnel's that it is relevant responsibility is also increasing;
3, all require to obtain whole conferencing information owing to add all MCU and the terminal of meeting, any one of system unusually all may involve the whole network, thereby makes the stability of system and reliability worse and worse;
4, whole Wondertek is oversize to the time of stable state.
Therefore, enlarge power system capacity, relate to the improvement of control mode.
Purpose of the present invention is exactly that existing TV conference system is not being done on the basis of any change, the existing TV conference system capacity of expansion.And when solution becomes big owing to power system capacity, the above-mentioned shortcoming that centralized control brings.
For achieving the above object the technical scheme below of the present invention the employing:
Because the signaling process part relations of the technical program and processor controls is close, briefly introduces MCU and terminal below, the general process of Signalling exchange between MCU and the MCU.
At first, MCU will carry out the mutual of information flow with communication counterpart, and they will carry out capabilities exchange procedure (H.242 ITU-T advises that the communicating pair of stipulating begins a communication control procedure when mutual) earlier; After capabilities exchange procedure finished, both sides can receive the various command that the opposite end sends.Wherein the order meeting sent out of MCU and terminal is different.According to this difference, it is MCU or terminal that the other side can be enough judged in one of communication.Behind the role who knows the other side mutually, communicating pair then enters commonality schemata state (ITU-T H.242 advise stipulate a communications status), begins to coordinate the control to meeting.
The present invention is exactly the improvement of above-mentioned signalling interactive process having been done following steps:
1, local MCU obtains the information of the port numbers that links to each other with higher level MCU, determines this port numbers, carries out normal capabilities exchange with higher level MCU then on this port numbers;
2, after capabilities exchange is finished, upwards do not send this signaling of any representative at the originating party of this port as MCU, the debit at this port does not upwards handle the similar signaling that the other side sends simultaneously;
3, for other port, local MCU still serves as normal persona.
In improved process to signalling interactive process, for the selection of signaling with handle can be according to MCU producer different and different, but purpose all reaches: 1, local MCU is virtual to higher level MCU is a terminal, makes higher level MCU see local MCU as a terminal; 2, local MCU also is used as higher level MCU as a terminal.Because the method for the processing signaling of step 2 has played higher level MCU and local MCU recognizes each other the effect of the other side for terminal each other, the present invention claims this method to be " virtual terminal technology ".
Because the present invention adopted above-mentioned technical scheme, in the time will carrying out dilatation to original system, can with have the technical program feature MCU with network as subnet continued access go into original system.Because original TV conference system is unaware of the existence of local subnet, so it need not to have MIH ability and ability T.120, thereby does not need to transform, and promptly can enlarge power system capacity on the original TV conference system basis of invariable of maintenance; Simultaneously, adopt centralized control though each subnet is inner, because each subnet is separate, whole system shows the control features of decentralized control, though power system capacity becomes greatly, the stability of whole system and reliability can not be affected.
The present invention is described in further detail below in conjunction with accompanying drawing and specific embodiment.
Fig. 1 is a TV conference system basic structure schematic diagram;
Fig. 2 is the MCU structural representation;
Fig. 3 is a TV conference system secondary cascade networking structure schematic diagram;
Fig. 4 is a TV conference system networking structure schematic diagram of the present invention.
Fig. 1 is the description to TV conference system basic structure in the prior art, has done detailed introduction in the background technology in front.
Fig. 2 is the MCU structural representation, has done detailed introduction in the background technology in front.
Fig. 3 is a TV conference system secondary cascade networking structure schematic diagram, has done detailed introduction in the background technology in front.
Fig. 4 is a TV conference system networking structure schematic diagram of the present invention.Be divided into original TV conference system part A and expansion B, C.Wherein original TV conference system A comprises MCU1, MCU2, terminal 1, and these equipment all are original TV conference system equipment, do not do any transformation; Expansion B comprises MCU4, MCU5, terminal 3; Expansion C comprises MCU3, MCU6, terminal 2.The signalling interactive process of whole network is as follows:
1, be provided with by the user or by other modes, local MCU3, MCU4 obtain the port numbers that links to each other with higher level MCU1, MCU2 respectively, carry out normal capabilities exchange with higher level MCU1, MCU2 on the port numbers separately after definite then.
2, after capabilities exchange is finished, upwards not sending any representative MCU3, MCU4 at the originating party of port separately is the signaling of MCU, as MCC (Multi-point Command Conference, the expression we are a MCU), MIM (Multi-point Indicate Master-MCU, the expression we are a main MCU) etc., simultaneously upwards, do not handle the similar signaling that MCU1, MCU2 send the debit of port separately.
3, for other port, local MCU3, MCU4 still serve as normal persona.Can serve as main MCU as local MCU4, it can insert again from MCU5 like this, forms a subnet; Equally, MCU3 can serve as main MCU, and it can insert from MCU6 like this; Control mode in these subnets can be just the same with original TV conference system, adopts centralized control.
In improved process to signalling interactive process, for the selection of signaling with handle can be according to MCU producer different and different, but purpose is to reach: 1, local MCU is virtual to higher level MCU is a terminal, makes higher level MCU see local MCU as a terminal; 2, local MCU also is used as higher level MCU as a terminal.
Be noted that adopting method of the present invention, MCU can also do other in the processing of signaling changes, and breaks the equality of each subnet, to realize some specific purposes.Motion as the camera that can realize the terminal in the terminal control local subnet in the last subnet takes a single example here, is implemented as follows:
1, after capabilities exchange is finished, owing to adopted virtual terminal technology, upper level MCU just local MCU to be used as for a terminal, thereby transmission＜TIA, M0, T0〉sign indicating number (TIA:TerminalIndicate Assignment), give local MCU distributing terminals numbering＜M0, T0 〉.
When 2, on local MCU will change, giving the audio frequency of higher level MCU and image, terminal transmission＜the TIA that has this information flow to this locality, M0, T0〉and＜TIN, M1, T1〉sign indicating number (TIN:TerminalIndicate Number), wherein＜M1, T1〉be a false terminal address, purpose is to lure this terminal to apply LSD (Low Speed Data) token to broadcast self LSD ability.
3, the application of this terminal that will receive of local MCU is transmitted to higher level MCU, whether grant an application by the main MCU decision in higher level's subnet, local MCU is transmitted to this terminal with the result, if the main MCU in higher level's subnet agrees this local terminal to apply, then local MCU broadcasting is from the LSD data of this terminal.
4, after finishing the broadcasting of its data, this terminal proposes to cancel application, local MCU uses and the same mode transmission information between higher level MCU and this terminal in front, if the main MCU in higher level's subnet agrees to cancel, local MCU goes on the air from the next LSD control data of higher level MCU, thereby has realized the motion of the camera of the terminal in the interior terminal control local subnet of a last subnet.
It should be noted that if adopt control terminal video camera mode by force in the conference system local MCU only needs to this terminal transmission＜TIA, M0, T0〉get final product.
Adopt the virtual terminal technology, can carry out big dilatation arbitrarily to TV conference system in theory.When subnet is too much,, at this moment also can consider to manage concentratedly by webmaster in order to strengthen the cooperation between each subnet.
Claims (3)
1, a kind of method of enlarged meeting television system capacity may further comprise the steps:
1) local MCU obtains the information of the port numbers that links to each other with higher level MCU, determines this port numbers, carries out normal capabilities exchange with higher level MCU then on this port numbers;
2) after capabilities exchange is finished, upwards do not send this signaling of any representative at the originating party of this port as MCU, the debit at this port does not upwards handle the similar signaling that the other side sends simultaneously;
3) for other port, local MCU still serves as normal persona.
2, the method for a kind of enlarged meeting television system capacity as claimed in claim 1 is characterized in that: the port numbers that the local MCU of described step 1) obtains to link to each other with higher level MCU obtains by user's set-up mode.
3, the method for a kind of enlarged meeting television system capacity as claimed in claim 1 or 2, it is characterized in that: step 2) the described signaling of representing this as MCU, can be MCC (Multi-pointCommand Conference, the expression we are a MCU), MIM (Multi-point IndicateMaster-MCU, expression we be a main MCU) etc.
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| CN 00114057 CN1258918C (en) | 2000-02-01 | 2000-02-01 | Method for increasing capacity of video conference system |
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| CN 00114057 CN1258918C (en) | 2000-02-01 | 2000-02-01 | Method for increasing capacity of video conference system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1323533C (en) * | 2003-09-29 | 2007-06-27 | 王生安 | Allocation method of distributed multipoint control unit in IP network multimedia conference system |
| CN100341327C (en) * | 2004-08-13 | 2007-10-03 | 中兴通讯股份有限公司 | Centralized management cascade conference method on video operation platform |
| CN100438613C (en) * | 2006-04-05 | 2008-11-26 | 北京华纬讯电信技术有限公司 | Transmission method of audio/video digital codes stream in multimedia video meeting's system |
| CN101179691B (en) * | 2006-11-10 | 2010-08-18 | 中兴通讯股份有限公司 | Method of extending multi-point control cell capability in session television system |
| CN101047828B (en) * | 2006-03-31 | 2011-05-25 | 联想(北京)有限公司 | Distribution conference system |
| CN101047531B (en) * | 2006-03-31 | 2012-12-05 | 联想(北京)有限公司 | Distributed conference system |
| CN102883131A (en) * | 2011-07-15 | 2013-01-16 | 中兴通讯股份有限公司 | Signaling interaction method and device based on tele-presence system |
| CN102883383B (en) * | 2006-04-19 | 2016-01-27 | 华为技术有限公司 | A kind of method of the feedback of results of link parameter configuration |
| CN105379179A (en) * | 2014-02-10 | 2016-03-02 | 华为技术有限公司 | Method, apparatus and system for controlling multiparty real-time communication |
-
2000
- 2000-02-01 CN CN 00114057 patent/CN1258918C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1323533C (en) * | 2003-09-29 | 2007-06-27 | 王生安 | Allocation method of distributed multipoint control unit in IP network multimedia conference system |
| CN100341327C (en) * | 2004-08-13 | 2007-10-03 | 中兴通讯股份有限公司 | Centralized management cascade conference method on video operation platform |
| CN101047828B (en) * | 2006-03-31 | 2011-05-25 | 联想(北京)有限公司 | Distribution conference system |
| CN101047531B (en) * | 2006-03-31 | 2012-12-05 | 联想(北京)有限公司 | Distributed conference system |
| CN100438613C (en) * | 2006-04-05 | 2008-11-26 | 北京华纬讯电信技术有限公司 | Transmission method of audio/video digital codes stream in multimedia video meeting's system |
| CN102883383B (en) * | 2006-04-19 | 2016-01-27 | 华为技术有限公司 | A kind of method of the feedback of results of link parameter configuration |
| CN101179691B (en) * | 2006-11-10 | 2010-08-18 | 中兴通讯股份有限公司 | Method of extending multi-point control cell capability in session television system |
| CN102883131A (en) * | 2011-07-15 | 2013-01-16 | 中兴通讯股份有限公司 | Signaling interaction method and device based on tele-presence system |
| CN102883131B (en) * | 2011-07-15 | 2017-02-08 | 中兴通讯股份有限公司 | Signaling interaction method and device based on tele-presence system |
| CN105379179A (en) * | 2014-02-10 | 2016-03-02 | 华为技术有限公司 | Method, apparatus and system for controlling multiparty real-time communication |
| CN105379179B (en) * | 2014-02-10 | 2020-05-08 | 华为技术有限公司 | Multi-party real-time communication control method, device and system |
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|---|---|
| CN1258918C (en) | 2006-06-07 |
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