CN1284816A - Method of realizing three-stage cascade of multipoint control units in meeting TV system - Google Patents
Method of realizing three-stage cascade of multipoint control units in meeting TV system Download PDFInfo
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- CN1284816A CN1284816A CN 99111445 CN99111445A CN1284816A CN 1284816 A CN1284816 A CN 1284816A CN 99111445 CN99111445 CN 99111445 CN 99111445 A CN99111445 A CN 99111445A CN 1284816 A CN1284816 A CN 1284816A
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Abstract
The meeting TV system consists of one unltipoint control unit supporting two-stage cascade and lower terminals. The method includes the following treatment: making a two-stage multipoint control unit and lower three-stage multipoint control units become a virtual system supported by a two-stage multipoint control unit and writing virtural mark number M; converting the actual mark MT number of the lower terminals of the multipoint control units into virtual mark MT number in the critical port of said virtual multipoint control unit so as to generate virtual terminal of two-stage multipoint control unit for communication with the upper mulpitoint control unit.
Description
The present invention relates to realize in the multi-medium video-signal conferencing technology field method of cascade, specifically, the present invention relates to a kind ofly, in the system that supports two-level concatenation, realize the method for three-stage cascade of multipoint control units following the standard formulation committee of International Telecommunications Union (ITU T) H.320 in the video conferencing field of standard.
The world today, because the continuous development of mechanics of communication, various modernized practical communication modes emerge in an endless stream, work is diligent in the strange land and the glad people that live have brought many facilities and quick in order to be in.TV conference system a kind of tissue that can be enterprise, particularly large enterprise and trans-corporation's routine work meeting that comes to this brings the modern communication instrument of very big facility and good efficiencies.
At present, in the prior art, normally used TV conference system is made up of multipoint control unit (MCU) and terminal.MCU couples together the terminal that is positioned at each meeting-place by transmission line, carries out video switch, voice mixing and multiple conference control party formula is provided, and makes a plurality of can field energy the meeting in same meeting.When the terminal number that connects surpasses the port number of MCU, need realize by the MCU cascade.ITU TH.231 and 1H.243 standard are followed in the MCU cascade, but only clearly support two-stage MCU cascade in standard H.243, for the situation of MCU cascade more than three grades and three grades, and the problem of studying after being described as waiting until in H.243.
China is vast in territory, and the video conferencing net is huger, and device type is also many, and the video conferencing equipment (major part is an overseas equipment) of online operation is not supported three grades and above cascade at present.This has brought difficulty for many producers equipment of large-scale complexity and the video conferencing networking of depositing.When the needs three-stage cascade, the mode networking of analog switching as shown in Figure 1 have to be adopted in various places, promptly desire is the cooperation of networking of two A, B networks among the figure, and existing method is that certain terminal n and the MCU of B network certain the terminal m under controlling down of secondary MCU control in the A network is arranged on same meeting-place.When A, B two network mutual communication, need two video conferencing nets be coupled together by the connection of simulation video/audio signal between terminal n, m, this connected mode causes the pictures and sounds quality to descend to some extent owing to video/audio signal has passed through twice compression and decompression, and analog switching has cut off the control signaling, make meeting control become complicated, not easy to operate.
Defective at above-mentioned prior art, the objective of the invention is to propose a kind of method that in the system that supports two-level concatenation, realizes the MCU three-stage cascade, from writing sign M number of secondary MCU that a system supports, and realized the three-stage cascade of MCU by three grades of MCU subnets that secondary MCU subnet and its are connect down.
Method of the present invention is achieved through the following technical solutions:
A kind of method that in TV conference system, realizes three-stage cascade of multipoint control units, wherein said TV conference system supports that by one the multipoint control unit of two-level concatenation and the terminal that connects down thereof are formed, this method comprises following processing: secondary multipoint control unit and the following some three grades of multipoint control units that connect thereof are invented the secondary multipoint control unit that a system supports, and write virtual identifying M number; On the critical port of described virtual multipoint control unit, actual identification MT number of the terminal that connects under each multipoint control unit converted to virtual identifying MT number, be used for the virtual terminal of secondary multipoint control unit that is, communicate by letter with higher level's multipoint control unit.
Described method also comprises: if a multipoint control unit is in the second level of three-stage cascade, judge that then the port that connects terminal under this multipoint control unit is critical port with the port of communicating by letter with higher level's multipoint control unit.
Described method also comprises: if a multipoint control unit is in the third level of three-stage cascade, judge that then the port that connects terminal under this multipoint control unit is critical port.
Described method also comprises: if a terminal is secondary multipoint control unit and the following terminal that connects thereof, then equal virtual MT number for actual identification MT number of this secondary multipoint control unit and the following terminal that connects thereof.
Described method also comprises: if a multipoint control unit is three grades of multipoint control units, then its actual identification is for M number the virtual T-17 of (virtual M-1) * 16+2+INT[()/16]; Be (virtual T-1) mod 16+1 actual T number of the terminal that connects under these three grades of multipoint control units.
Described method also comprises: if a terminal is secondary multipoint control unit and the following terminal that connects thereof, then equal actual identification MT number for virtual MT number of this secondary multipoint control unit and the following terminal that connects thereof.
Described method also comprises: if a multipoint control unit is three grades of multipoint control units, then the virtual M of these three grades of terminals grade is secondary M number, and virtual T number is that 16+ is from the actual T of MCU port number * 16+ number.
Described method also comprises: three grades of MCU in the above-mentioned virtual multipoint control unit are connected on 0 to 9 port of secondary multipoint control unit.
Described method also comprises: have the actual MT of each terminal number order if above-mentioned virtual multipoint control unit sends to higher level's multipoint control unit, should convert to for actual MT number virtual MT number.
Described method also comprises: if each terminal in the described virtual multipoint control unit sends terminal indication list commands to the higher level, the terminal that to expand this indication list commands be described virtual multipoint control unit is indicated list commands.
Described method also comprises: if terminal that each multipoint control unit connects transmission has actual MT number order in the described virtual multipoint control unit, change this actual MT number and be virtual MT number, send this order.
Described method also comprises: if described virtual multipoint control unit receive be higher level's multipoint control unit send have an order of virtual MT number, changing this virtual MT number is actual MT number, handles accordingly according to described order again.
According to an aspect of the present invention, by with secondary MCU and several three grades of MCU that connect down invent the MCU of a secondary, and the conversion of the actual situation of the enterprising line identifier MT of the critical port number that correspondingly need communicate by letter at them, thereby realize three-stage cascade in the decide TV conference system of MCU of the MCU that does not support three-stage cascade, and the image that this TV conference system transmits and the quality of sound do not descend, terminal under non-" virtual terminal " MCU can be controlled the video camera of terminal under " virtual terminal " MCU, vice versa, just the same when video camera control operation and two-level concatenation.The meeting control operation is just the same during also with two-level concatenation.Method of the present invention has enlarged networking capability, and image, the sound quality of having avoided analog switching to bring descends and the control complicated problems.
According to a further aspect of the invention, all three grades of MCU can and must be connected on 0 to 9 port, and at this moment Zui Da virtual identifying T number is 176.
By description, will make technique scheme of the present invention and advantage apparent below in conjunction with accompanying drawing to preferred embodiment of the present invention.In the accompanying drawing,
The MCU of the ITU TH.243 standard of following of prior art that shown in Figure 1 is realizes the system schematic of simulation cascade;
Shown in Figure 2 is the system schematic of the MCU realization three-stage cascade of the ITU of following TH.243 standard of the present invention, and wherein secondary MCU and its each three grades of MCU that connects down are virtual is a secondary MCU;
Fig. 3 shows the process chart that the method according to this invention realizes the MCU three-stage cascade.
Hereinafter will describe the present invention in detail.
Virtual MCU of the present invention system is illustrated among Fig. 2, promptly at first with some three grades of MCU subnet systems of cascade again under the secondary MCU subnet system; Thus, this virtual MCU need be write a virtual secondary MCU sign M number certainly.Promptly one by the TV conference system of following the secondary MCU under ITU TH.231 and main MCU H.243 and its and forming with the terminal that MCU at different levels link in, processing procedure by bit rate distributing signal (BAS) signaling is controlled and is revised, invent a MCU with the MCU of subordinate with second level MCU used in the meeting television system and cascade thereof, thus, for higher level MCU, below can thinking, it has only met a MCU, and for the terminal of the MCU of the terminal of the corresponding levels or subordinate, they also all can think to be connected on the same MCU.
The virtual MCU technology mainly is the processing procedure of BAS signaling is controlled and revised, comprise following several aspect: not indicating MCU in BAS signaling code stream is which rank of, and the reason of not supporting the main MCU of three-stage cascade can not accept three grades of MCU is the terminal list that it does not accept second MCU coming from same port.So we handle the terminal list of third level MCU, the terminal list that converts to after virtual MT number with second level MCU merges, at this moment have only one M number; When issuing main MCU, caused the illusion of having only two-stage MCU, just can make other MCU see the terminal of three grades of MCU.And, remain a tertiary structure for this third level MCU and the two-stage MCU on it.When the terminal of third level MCU be watched or be broadcasted to other terminal in the meeting will, the MT in the order number was MT number after the conversion, promptly virtual MT number; When secondary MCU receives this order, it must convert to again for these MT numbers three grades MT number, do corresponding processing again according to described order at last.
Represent virtual M number with M ', T ' expression virtual T number, then virtual MT number as follows with actual MT number transformation rule:
When T is 1 to 16, just equal virtual MT number for actual MT number, promptly at the terminal on the secondary MCU; When T ' was 17 to 32, actual M number was (M '-1) * 16+2, and T number is (T '-1) mod 16+1, promptly at three grades of MCU on the 0th port; When T ' was 33 to 48, actual M number was (M '-1) * 16+3, and T number is (T-1) mod 16+1, promptly at three grades of MCU on the 1st port.So analogize, when T ' greater than 16 the time, actual M number is the virtual T-17 of (M '-1) * 16+2+INT[()/16], T number is (T '-1) mod 16+1.
Conversely, equal actual MT number for virtual MT number of the secondary terminal, the M ' of three grades of terminals equals secondary M number; T ' equals: 16+ is from the actual T of MCU port number * 16+ number.So three grades of MCU can only be connected on 0 to 9 port, at this moment Zui Da T ' is: 16+9 * 16+16=176;
Secondly, when virtual multipoint control unit of the present invention is communicated by letter with the higher level, only critical end eloquence need carry out virtual MT number with actual MT number conversion process.Adopting which port of following rule judgment is critical port, as shown in Figure 2, at first, if a multipoint control unit is in the second level of three-stage cascade, judge that then the port 20,22 that connects terminal under this multipoint control unit is critical port with the port one of communicating by letter with higher level's multipoint control unit 0.If a multipoint control unit is in the third level of three-stage cascade, judge that then the port 30,32,34 and 36 that connects terminal under this multipoint control unit is critical port.
The processing procedure of virtual multipoint control unit of the present invention is illustrated among Fig. 3.
Select the MCU that the follows TU TH.243 standard main MCU as video conferencing for use, in its subordinate secondary MCU and three grades of MCU are set further, MCU at different levels are connected with some terminals separately.If system judges it is that virtual MCU sends the BAS signaling to its higher level MCU at step S100, system also will judge whether the BAS signaling that will send is to have MT number H.230 order at step S102, if judging among the system step S104 is for this MT number actual MT number of each terminal of virtual MCU, transmission after carrying out treatment step S106 and converting virtual MT number to actual MT in this order number to.In addition, system also needs corresponding processing is made in the indication tabulation of the terminal in the BAS signaling (TIL) order, if system judges that the BAS signaling that virtual MCU will send is its TIL order that meets each MCU down in step S108, then system carries out treatment step S110, this TIL order is expanded into the TIL order of whole virtual MCU, and then sends this BAS signaling.
If system judges that at step S100 virtual MCU does not send the BAS signaling to its higher level MCU, next, system also will judge whether it is that each MCU institute connecting terminal has sent the BAS signaling in virtual MCU among the step S200, if it is to have MT number H.230 order that simultaneity factor is judged the BAS signaling that will send at step S202, then further judge MT number be actual MT number of each terminal of virtual MCU, step S204, final system is with execution in step S206, after converting virtual MT number to this actual MT number to, send this BAS signaling.
Secondly, if system judges it is not that each MCU institute connecting terminal has sent the BAS signaling in virtual MCU at step S200, then system also will judge whether the BAS signaling of the virtual MCU that this virtual MCU reception higher level MCU sends in step S300, further, have virtual MT number H.230 order if this virtual MCU receives, step S302 is with the processing of execution in step S304, converting to for this virtual MT number actual MT number, carry out respective handling again according to described order at last.
Claims (12)
1. method that in TV conference system, realizes three-stage cascade of multipoint control units, wherein said TV conference system supports that by one the multipoint control unit of two-level concatenation and the terminal that connects down thereof are formed, the method is characterized in that, comprise following processing:
A) secondary multipoint control unit and the following some three grades of multipoint control units that connect thereof are invented the secondary multipoint control unit that a system supports, and write virtual identifying M number;
B) on the critical port of described virtual multipoint control unit, actual identification MT number of the terminal that connects under each multipoint control unit converted to virtual identifying MT number, be used for the virtual terminal of secondary multipoint control unit that is, communicate by letter with higher level's multipoint control unit.
2. method according to claim 1, it is characterized in that, the treatment step of judging described critical port in the step b) comprises: if a multipoint control unit is in the second level of three-stage cascade, judge that then the port that connects terminal under this multipoint control unit is critical port with the port of communicating by letter with higher level's multipoint control unit.
3. method according to claim 1, it is characterized in that, the treatment step of judging described critical port in the step b) also comprises: if a multipoint control unit is in the third level of three-stage cascade, judge that then the port that connects terminal under this multipoint control unit is critical port.
4. method according to claim 1, it is characterized in that, actual identification described in step b) MT number comprises with described virtual MT number conversion process: if a terminal is secondary multipoint control unit and the terminal that connects down thereof, then equal virtual MT number for actual identification MT number of this secondary multipoint control unit and the terminal that connects down thereof.
5. method according to claim 1, it is characterized in that, actual identification described in step b) MT number comprises with described virtual MT number conversion process: if a multipoint control unit is three grades of multipoint control units, then its actual identification is for M number the virtual T-17 of (virtual M-1) * 16+2+INT[()/16]; Be (virtual T-1) mod 16+1 actual T number of the terminal that connects under these three grades of multipoint control units.
6. method according to claim 4, it is characterized in that, virtual identifying described in step b) MT number comprises with described actual MT number conversion process: if a terminal is secondary multipoint control unit and the terminal that connects down thereof, then equal actual identification MT number for virtual MT number of this secondary multipoint control unit and the terminal that connects down thereof.
7. method according to claim 5, it is characterized in that, virtual identifying described in step b) MT number comprises with described actual MT number conversion process: if a multipoint control unit is three grades of multipoint control units, then the virtual M of these three grades of terminals grade is secondary M number, and virtual T number is that 16+ is from the actual T of MCU port number * 16+ number.
8. method according to claim 7 is characterized in that, this method also comprises: three grades of MCU in the above-mentioned virtual multipoint control unit are connected on 0 to 9 port of secondary multipoint control unit.
9. according to claim 1 or 6 or 7 described methods, it is characterized in that this method also comprises: have the actual MT of each terminal number order if above-mentioned virtual multipoint control unit sends to higher level's multipoint control unit, should convert to for actual MT number virtual MT number.
10. method according to claim 1, it is characterized in that, this method also comprises: if each terminal in the described virtual multipoint control unit sends terminal indication list commands to the higher level, the terminal that to expand this indication list commands be described virtual multipoint control unit is indicated list commands.
11. according to claim 1 or 6 or 7 described methods, it is characterized in that, this method also comprises: if terminal that each multipoint control unit connects transmission has actual MT number order in the described virtual multipoint control unit, change this actual MT number and be virtual MT number, send this order.
12. according to claim 1 or 4 or 5 described methods, it is characterized in that, this method also comprises: if described virtual multipoint control unit receive be higher level's multipoint control unit send have an order of virtual MT number, changing this virtual MT number is actual MT number, and respective handling is carried out in this order.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005046232A1 (en) * | 2003-11-05 | 2005-05-19 | Huawei Technologies Co., Ltd. | A video conference system and the administrating method thereof |
| WO2007076637A1 (en) * | 2005-12-31 | 2007-07-12 | Zte Corporation | Method for making use of h239 presentation tokens in multi-stage cascade video conference system |
| CN100454820C (en) * | 2006-07-04 | 2009-01-21 | 华为技术有限公司 | MCU cascade system and establishing and communication method for the same |
| CN101895407A (en) * | 2010-08-09 | 2010-11-24 | 北京佳讯飞鸿电气股份有限公司 | Method for realizing conference cascade in dispatching communication system |
| WO2011023103A1 (en) * | 2009-08-31 | 2011-03-03 | 华为终端有限公司 | Media control server cascaded system, and method and device for controlling multimedia code stream |
| CN103354557A (en) * | 2009-08-31 | 2013-10-16 | 华为终端有限公司 | Media control server cascade system, multimedia code stream control method and apparatus thereof |
| CN107666396A (en) * | 2016-07-29 | 2018-02-06 | 杭州华为企业通信技术有限公司 | A kind of multiple terminals meeting processing method and processing device |
| CN110943848A (en) * | 2012-10-05 | 2020-03-31 | 华为技术有限公司 | Method for virtual communication between wireless network and multiple UEs |
| CN115529433A (en) * | 2022-09-27 | 2022-12-27 | 浙江华创视讯科技有限公司 | Cross-domain polling method and device for cascading video conference and electronic equipment |
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1999
- 1999-08-17 CN CN 99111445 patent/CN1284816A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005046232A1 (en) * | 2003-11-05 | 2005-05-19 | Huawei Technologies Co., Ltd. | A video conference system and the administrating method thereof |
| CN100359942C (en) * | 2003-11-05 | 2008-01-02 | 华为技术有限公司 | Visual conference system and its managing method |
| US7683923B2 (en) | 2003-11-05 | 2010-03-23 | Huawei Technologies Co., Ltd. | Videoconference system and a management method thereof |
| US8310518B2 (en) | 2003-11-05 | 2012-11-13 | Huawei Technologies Co., Ltd. | Videoconference system and management method thereof |
| WO2007076637A1 (en) * | 2005-12-31 | 2007-07-12 | Zte Corporation | Method for making use of h239 presentation tokens in multi-stage cascade video conference system |
| CN100454820C (en) * | 2006-07-04 | 2009-01-21 | 华为技术有限公司 | MCU cascade system and establishing and communication method for the same |
| WO2011023103A1 (en) * | 2009-08-31 | 2011-03-03 | 华为终端有限公司 | Media control server cascaded system, and method and device for controlling multimedia code stream |
| CN103354557A (en) * | 2009-08-31 | 2013-10-16 | 华为终端有限公司 | Media control server cascade system, multimedia code stream control method and apparatus thereof |
| CN101895407A (en) * | 2010-08-09 | 2010-11-24 | 北京佳讯飞鸿电气股份有限公司 | Method for realizing conference cascade in dispatching communication system |
| CN110943848A (en) * | 2012-10-05 | 2020-03-31 | 华为技术有限公司 | Method for virtual communication between wireless network and multiple UEs |
| CN110943848B (en) * | 2012-10-05 | 2022-06-07 | 华为技术有限公司 | Method and equipment for virtual communication between wireless network and multiple UEs |
| CN107666396A (en) * | 2016-07-29 | 2018-02-06 | 杭州华为企业通信技术有限公司 | A kind of multiple terminals meeting processing method and processing device |
| CN115529433A (en) * | 2022-09-27 | 2022-12-27 | 浙江华创视讯科技有限公司 | Cross-domain polling method and device for cascading video conference and electronic equipment |
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