CN1845597A - Method for realizing audio/video information stream interconnection for video conference with private network terminal - Google Patents
Method for realizing audio/video information stream interconnection for video conference with private network terminal Download PDFInfo
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- CN1845597A CN1845597A CN 200610011832 CN200610011832A CN1845597A CN 1845597 A CN1845597 A CN 1845597A CN 200610011832 CN200610011832 CN 200610011832 CN 200610011832 A CN200610011832 A CN 200610011832A CN 1845597 A CN1845597 A CN 1845597A
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Abstract
The provided method to realize audio and video information interaction with private terminal for video conference comprises: applying terminal with data transfer capacity and independent IP address as the public relay terminal to connect to the private terminal for data package transfer. Whatever CONE NAT way or SYMMETRIC NAT way of the private terminal, this invention can both benefits to their interaction, expands bandwidth and backups the data.
Description
Technical field
The present invention relates to multimedia videoconference system communication technology, particularly have the multimedia conferencing mechanics of communication of private network, the video conference that especially has private net terminal realizes the method for audio/video information code stream intercommunication.
Background technology
Because public network (Internet) is gone up the shortage of IP address, many users can't obtain an independently public network IP address.The method that addresses this problem allows exactly a plurality of users share an IP address on the network.Therefore, enterprise and unit set up internal lan (private network Intranet), each terminal in the local area network (LAN) will can only be shared an IP address with the public network communication in the external world, so, all private net terminals want simultaneously with extraneous public network communication need be by NATP (network address port is changed Port-Level NAT) mode: home address is mapped on the different port of an IP address of external network.It connects inside on the independent IP address that is mapped in the external network, adds one simultaneously by the selected port numbers of NAT device on this address.Prior NAT P mode has two kinds: CONE NAT and SYMMETRIC NAT.
CONE NAT: so long as the packet that comes out from same home address and port, NAT converts it to same external address and port.
SYMMETRIC NAT: so long as the packet that comes out from same home address and port, and to same outside destination address and port, then NAT also converts it to same external address and port.If but from the packet that same home address and port come out, be to different external addresss and port, then NAT will use different mappings, convert different ports to.
In video conferencing system, the situation that the participant terminal all is private net terminals may appear, and then need to solve and carry out audio frequency and video communication problem between any two private net terminals, realize audio/video information communication between the private net terminal.If mutually the private net terminal of communication all adopts CONE NAT mode, the public IP address of private network that can be by obtaining the terminal place and this terminal corresponding port number are come and its communication.And mutually the private net terminal of communication all adopts SYMMETRIC NAT mode because port numbers is uncertain, other private net terminals can't with its communication.
Summary of the invention
The present invention is directed to the defective or the deficiency that exist in the prior art, provide a kind of video conference that has private net terminal to realize the method for audio/video information code stream intercommunication, adopt this method, no matter private net terminal is to adopt CONE NAT mode or SYMMETRIC NAT mode, all can help realizing the audio/video information code stream intercommunication between them.By further perfect, can also in intercommunication, realize the expansion and the data backup transmission of virtual bandwidth.
Technical conceive of the present invention is: have the data forwarding ability and have the terminal of independent IP address as public link terminal by utilization, this public link terminal connects private net terminal, the line data bag of going forward side by side is transmitted, and this just can be so that the private net terminal of the uncertain SYMMETRIC NAT of port numbers mode can utilize public link terminal to realize the communication of itself and other-end.Certainly, can also judge in advance that each private net terminal that needs communication is the CONENAT mode, or the SYMMETRICNAT mode; If CONE NAT mode can directly realize intercommunication as long as obtain the other side's external address and port numbers.
Technical scheme of the present invention is as follows:
The video conference that has private net terminal realizes the method for audio/video information code stream intercommunication, it is characterized in that may further comprise the steps: utilize to have the data forwarding ability and have the terminal of independent IP address as public link terminal, this public link terminal connects private net terminal, and the line data bag of going forward side by side is transmitted.
Described public link terminal be link terminal intrinsic in the video conferencing system and, or participant terminal.
The use of described public link terminal is only at the SYMMETRIC NAT mode in the private net terminal network address translation mode.
The affirmation of described SYMMETRIC NAT mode adopts following steps to draw: send packet from same private net terminal to two different outside ip address, the port numbers that compares twice acquisition, if the port numbers unanimity of twice acquisition judges that then this private net terminal network address translation mode is a CONE NAT mode; Otherwise, then be SYMMETRIC NAT mode.
Described public link terminal has a plurality of, and when the audio-video code stream that need transmit at private net terminal was big, the audio-video code stream that private net terminal need be transmitted was divided into several packets, and each packet is forwarded to the receiving terminal by different public link terminals.
Described public link terminal has a plurality of, and under the situation that the video conference resource allows, the audio-video code stream that private net terminal need be transmitted repeatedly is forwarded to by different public link terminals accepts private net terminal, thereby guarantees the reliability of audio-video code stream transmission.
Technique effect of the present invention is as follows:
Because the video conference that has private net terminal of the present invention realizes the method for audio/video information code stream intercommunication, the technical measures of " will have the data forwarding ability and have the terminal of independent IP address; this public link terminal connects private net terminal; the line data bag of going forward side by side is transmitted " have been adopted as public link terminal, like this, no matter the network address translation mode of private net terminal is CONE
NAT mode, or SYMMETRIC NAT mode all can make private net terminal participate in the intercommunication of the audio/video information code stream of video conference well.By further perfect, can also realize the distribution of audio/video information code stream simultaneously, thereby bring a kind of expansion of virtual transmission bandwidth.Can also realize the backup of audio/video information code stream, thereby guarantee audio/video information code stream safety of transmission.
Description of drawings
Fig. 1 has the structural representation of the video conference realization audio/video information code stream intercommunication of private net terminal for the present invention.
Fig. 2 has the simple structure schematic diagram of the video conference realization audio/video information code stream intercommunication of private net terminal for the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
For the video conference that has private net terminal, the present invention adopts following system scheme, realizes the intercommunication of audio/video information code stream.
1, judges that private net terminal network address translation mode is CONENAT mode or SYMMETRIC NAT mode.Determination methods is as follows: send packet from same private net terminal to two different outside ip address, compare the port numbers of twice acquisition, if the port numbers unanimity of twice acquisition judges that then this private net terminal network address translation mode is a CONE NAT mode.Otherwise, SYMMETRIC NAT mode.
2 if CONE NAT mode directly just can realize and this private net terminal communication by external address and port numbers.
If SYMMETRIC NAT mode adopts public link terminal to solve.Public link terminal meets the demands: a, have the data forwarding ability.B, has independent IP address or its network address translation mode is a CONE NAT mode.Allow this private terminal all send packet to public link terminal, make self can with the communication of common terminal relaying, like this, the common terminal relaying becomes one and transmits mechanism, and audio-video code stream is forwarded to another private terminal.Public link terminal can be an intrinsic link terminal in any one meets the demands in the video conferencing system participant terminal or the video conferencing system.
3, expand based on public link terminal virtual bandwidth.When the audio-video code stream that need transmit at private net terminal is big, the audio-video code stream that private net terminal need transmit can be divided into several packets, each packet then is forwarded to the receiving terminal by different public link terminals.The bandwidth of having disperseed each public link terminal like this, the pressure of disposal ability.The illusion of bringing a kind of transmission bandwidth to expand for the private net terminal of the audio-video code stream of needs transmission.
4, based on public link terminal data backup mechanism.Under the situation that the video conference resource allows, the audio-video code stream that private net terminal need be transmitted repeatedly is forwarded to by different public link terminals accepts private net terminal.Thereby guarantee the reliability of audio-video code stream transmission.
The video conferencing system that has private network as shown in Figure 1 comprises that the videoconference system server that is connected to public network, public link terminal, public network terminal, network address translation apparatus are NAT and private network and terminal thereof.Network terminal Si among the figure (i=1,2 ... .) expression is private net terminal in the video conferencing system, Gi (i=1,2 ...) public network terminal in the expression video conferencing system.Two private networks are represented with LAN A and LAN B respectively.
The video conference that has private net terminal as shown in Figure 2 realizes the simple structure of audio/video information code stream intercommunication, is the intercommunication that the example explanation has the video conferencing system realization audio-video code stream of private network with two private net terminal S1 and S2 only.System situation is as follows:
S1, S2 are two private net terminals.
G1 is the public network terminal with transfer capability.
G2 is not for having the public network terminal of transfer capability.
Public link terminal A, B are forwarding terminals intrinsic in the system.
The public outside ip address of LAN A: 211.10.1.16.
The public outside ip address of LAN B: 192.168.0.1.
Public link terminal A IP address: 201.16.1.8.
Public link terminal B IP address: 221.219.1.16.
The concrete operations step of private net terminal S1 and private net terminal S2 intercommunication audio-video code stream information is as follows:
S1 in the LANA private network terminal G1 and G2 in public network send the audio-video code stream packet and obtain port numbers A and port numbers B respectively.
| Port numbers A, whether B is consistent | The NAT mode that S1 adopts |
| Be | The CONENAT mode |
| Not | SYMMETRIC NAT mode |
Equally, the NAT mode that S2 adopts is determined in the above-mentioned work of S2 in the LAN B private network.
Situation that may occur such as following table:
| The situation sequence number | The NAT mode of private network port S1 | The NAT mode of private network port S2 |
| a | The CONENAT mode | The CONENAT mode |
| b | SYMMETRIC NAT mode | The CONENAT mode |
| c | The CONENAT mode | SYMMETRIC NAT mode |
| d | SYMMETRIC NAT mode | SYMMETRIC NAT mode |
The a situation:
S1 and the intercommunication of S2 realization audio/video information code stream only need be obtained the other side's public outside ip address port numbers.Be that public outside ip address (192.168.0.1)+S2 corresponding port number that S1 obtains LAN B sends audio-video code stream to S2, same, public outside ip address (211.10.1.16)+S1 corresponding port that S2 obtains LAN A number sends audio-video code stream to S2.
B, c, d situation:
As long as it is SYMMETRIC NAT mode that either party NAT mode is arranged among private net terminal S1 and the S2, then need to transmit the intercommunication of realization audio/video information code stream by public link terminal.
Private net terminal S1 and S2 obtain the IP address of public link terminal A respectively, set up communication port with it and do not disconnect.The audio/video information code stream that S1 sends to S2 with needs sends to earlier and obtains public link terminal A, is transmitted to S2 again by obtaining public link terminal A.Equally, S2 also needs are sent to S1 the audio/video information code stream send to earlier and obtain public link terminal A, be transmitted to S1 again by obtaining public link terminal A.
If it is too big that private net terminal S1 need send to the audio/video information bit stream data amount of S2, S1 can be divided into a plurality of packets with whole code stream, these packets are by two public link terminal A in this video conferencing system, and the terminal G1 that has transfer capability on B or the public network realizes being forwarded to S2.
Cut off the reliability that S1 sends to the transmission of S2 audio/video information code stream in order to guarantee private network, S1 also can be by two public link terminal A in this video conferencing system, and the terminal G1 that has transfer capability on B or the public network repeatedly is forwarded to S2 with same audio/video information code stream.
Should be pointed out that the above embodiment can make those skilled in the art more fully understand the present invention, but do not limit the present invention in any way.Therefore, although this specification has been described in detail the present invention with reference to drawings and Examples,, it will be appreciated by those skilled in the art that still and can make amendment or be equal to replacement the present invention; And all do not break away from the technical scheme and the improvement thereof of the spirit and scope of the present invention, and it all should be encompassed in the middle of the protection range of patent of the present invention.
Claims (6)
1. the video conference that has private net terminal realizes the method for audio/video information code stream intercommunication, it is characterized in that may further comprise the steps: utilize to have the data forwarding ability and have the terminal of independent IP address as public link terminal, this public link terminal connects private net terminal, and the line data bag of going forward side by side is transmitted.
2. the video conference that has private net terminal according to claim 1 realizes the method for audio/video information code stream intercommunication, it is characterized in that described public link terminal is a link terminal intrinsic in the video conferencing system, and/or the participant terminal.
3. the video conference that has private net terminal according to claim 2 realizes the method for audio/video information code stream intercommunication, and the use that it is characterized in that described public link terminal is only at the SYMMETRICNAT mode in the private net terminal network address translation mode.
4. the video conference that has private net terminal according to claim 3 realizes the method for audio/video information code stream intercommunication, the affirmation that it is characterized in that described SYMMETRIC NAT mode adopts following steps to draw: send packet from same private net terminal to two different outside ip address, the port numbers that compares twice acquisition, if the port numbers unanimity of twice acquisition judges that then this private net terminal network address translation mode is a CONE NAT mode; Otherwise, then be SYMMETRIC NAT mode.
5. the video conference that has private net terminal according to claim 1 realizes the method for audio/video information code stream intercommunication, it is characterized in that described public link terminal has a plurality of, when the audio-video code stream that need transmit at private net terminal is big, the audio-video code stream that private net terminal need be transmitted is divided into several packets, and each packet is forwarded to the receiving terminal by different public link terminals.
6. the video conference that has private net terminal according to claim 1 realizes the method for audio/video information code stream intercommunication, it is characterized in that described public link terminal has a plurality of, under the situation that the video conference resource allows, the audio-video code stream that private net terminal need be transmitted repeatedly is forwarded to by different public link terminals accepts private net terminal, thereby guarantees the reliability of audio-video code stream transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200610011832 CN1845597A (en) | 2006-04-30 | 2006-04-30 | Method for realizing audio/video information stream interconnection for video conference with private network terminal |
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|---|---|---|---|
| CN 200610011832 CN1845597A (en) | 2006-04-30 | 2006-04-30 | Method for realizing audio/video information stream interconnection for video conference with private network terminal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101911667A (en) * | 2007-12-27 | 2010-12-08 | 松下电器产业株式会社 | Connection device and connection method |
| CN102469410A (en) * | 2010-11-02 | 2012-05-23 | 中国移动通信集团公司 | Method, equipment and system for transmitting data |
-
2006
- 2006-04-30 CN CN 200610011832 patent/CN1845597A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101911667A (en) * | 2007-12-27 | 2010-12-08 | 松下电器产业株式会社 | Connection device and connection method |
| CN102469410A (en) * | 2010-11-02 | 2012-05-23 | 中国移动通信集团公司 | Method, equipment and system for transmitting data |
| CN102469410B (en) * | 2010-11-02 | 2016-04-27 | 中国移动通信集团公司 | A kind of data transmission method, equipment and system |
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