CN102857829B - Wireless video information multi-path transmission method based on third-generation (3G) network - Google Patents
Wireless video information multi-path transmission method based on third-generation (3G) network Download PDFInfo
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- CN102857829B CN102857829B CN201210398948.8A CN201210398948A CN102857829B CN 102857829 B CN102857829 B CN 102857829B CN 201210398948 A CN201210398948 A CN 201210398948A CN 102857829 B CN102857829 B CN 102857829B
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Abstract
The invention discloses a wireless video information multi-path transmission method based on a third-generation (3G) network. Wireless video sensor nodes in a region are grouped into a self-organization network through wireless fidelity (wifi); each node communicates with an adjacent node and a remote video receiving end; when a certain wireless video sensor node Na in the self-organization network catches a certain event in the region, the node Na starts to transmit video data to a client in real time and broadcasts a message La to other nodes nearby; after other nodes receive the message La and do not transmit the video data, the nodes can reply information for transferring the video data; the node Na is in tcp connection with the nodes from N1 to Nm; the node divides the video data into M+1 parts marked with relevant information; the parts are distributed to the node and M nodes which send the reply information; and the M+1 nodes send the video data to the client through the 3G network. By the method, the video transmission instantaneity is improved, and the quality of service (QoS) is improved; and the video transmission bandwidth is increased.
Description
Technical field
The present invention relates to a kind of transmission method of the wireless video information based on 3G network, is a kind of wireless video information multi-path transmission method based on 3G network specifically.
Background technology
Along with progress and the actual needs of technology, promote the arrival of 3G.3G is the abbreviation of English 3rd generation, refers to G mobile communication, and it is third generation mobile communication system radio communication be combined with multimedia communications such as Internets.It can process the media forms such as image, music, video flowing, the much information services such as providing package purse rope page browsing, videoconference, ecommerce.
Collect based on traditional wire the video monitoring realized and there is significant defect, such as: be short of vigorous and nimble property; Expand and adjust not convenient; Lack mobility etc.The development trend adopting radio video sensor node to carry out video monitoring to become following, radio video sensor node has that volume is little, low in energy consumption, aboundresources, the advantage such as low in energy consumption, cheap.Along with widely using of general-purpose built-in type chip ARM, adopt the instrument of USB camera as video acquisition of low cost, the functions such as the control of application embedded microprocessor S3C6410 completion system, video data acquiring, video image compression and transmission.
Adopt wireless transmission video then more to dispose simple, cost is cheaper, and wireless transmission comprises wifi, the modes such as 3G, zigbee, and wherein 3G transmission range is comparatively far away, by the restriction of space-time, can not carry out video monitoring better to specific region.The more important thing is that it after accident occurs, can be reached the spot rapidly, and pass vision signal back client, directly responded unpredictability and the actual effect of accident.
There is China Mobile (TD-SCDMA) within Chinese territory at present, large 3G network operator of China Telecom (CDMA2000) and CHINAUNICOM (WCDMA) three and three 3G network standards.The downstream rate that the TD-SCDMA of China Mobile supports is 2.8Mb/s, and upstream rate is 384Kb/s; The downstream rate that the CDMA2000 of China Telecom supports is 3.1Mb/s, and upstream rate is 1.8Mb/s; The downstream rate that the WCDMA of CHINAUNICOM supports is 14.4Mb/s, and upstream rate is 5.76Mb/s.As can be seen here, only have the WCDMA network of CHINAUNICOM that single deck tape-recorder can be used to meet the bandwidth requirement of transmission of video, and other two all cannot meet this requirement.
Test in actual environment, above-mentioned bandwidth is the theoretical peak of respective 3G network agreement, is difficult to reach this value when normal use.If therefore want under the network environment that China is current, it is more difficult that simple dependence 3G technology obtains wider and stable bandwidth resources.The bandwidth transmitted by 3G network has certain restriction.Therefore just need the auxiliary of various control and balancing technique, jointly complete such object, academic circles at present and industrial quarters mainly take following several method and process.
(1) when transmit image data, because the data volume of view data is comparatively large, consider first to compress rear transmission to vedio data.After achieving the transmission success of plane picture, when again needing to send screen image data, continuing the screen image data sending this region of variation selectively, reaching the object improving image transmitting efficiency.
(2) add the QoS controlling mechanism of application layer, make can make full use of the network bandwidth while taking into account real-time, reach the real-time Transmission of video flowing.This mechanism contains again two kinds of situations: the first situation adopts Transmission Control Protocol to carry out transmission of video, according to the feedback data of 3G network features and application layer, is optimized TCP transmission layer, makes the packet loss of transmission of video and postpones all to decrease.
TCP is applied to 3G network when carrying out multitude of video information transmission, and the high packet loss caused by channel error code makes the windowing mechanism of TCP normally to work, and transmission performance sharply declines.Therefore, the work of many academias is on current 3G network, adopt UDP to carry out real-time video transmission.Therefore the second situation adopts udp protocol to carry out transmission of video, udp protocol basis adds some control, such as frame per second controls and packet loss control, packet loss control is different from the window control mechanism of Transmission Control Protocol, but introduce the actual features that the QoS controlling mechanism proposed has taken into full account 3G network wireless channel, reduce packet loss well, and can the fluctuation of smoothed channel, reach the stable frame per second transmission of video flowing.
(3) industrial quarters have employed and is optimized the antenna of hardware as 3G network acceptance and transmission, design a kind of smart antenna, the smart antenna array aerial array of many antenna compositions with direction-changeable, its variable directivity can strengthen the intensity of signal significantly.Come to carry out communication with adjacent base station with this, received by adjacent base station and send data.So just expand the bandwidth resources that can utilize, make the channel of foundation more reliable and stable.
In practical situations both, time video monitoring is carried out to specific region, radio video sensor node can be placed in different positions, carry out video monitoring in region from different perspectives.Radio video sensor node mainly contains 4 large functional module compositions, is energy module respectively, sensor assembly (camera), processing module, wireless sending module.The function that each module is corresponding different, the supply of energy module responsible node energy and control, sensor assembly is responsible for video information in pickup area, and processing module is responsible for processing video information, and wireless sending module is responsible for transmission and the reception of video.
Radio video sensor node in region can be communicated by wifi, and they constitute the WLAN (wireless local area network) of a self-organizing.Each radio video sensor node is except with except adjacent node communication, communicating with long-range video receiver by 3G network, sending video data to video receiver.
If node directly transmits video data to receiving terminal by 3G network, because the bandwidth of 3G network is less, and the error rate is higher, and the video data volume is larger, according to coded system H.264, bandwidth chahnel at least will ensure that the long period is constant between 1.5Mb/s to 2.0Mb/s, not so cannot ensure the transmission of clear continuous print video information.
Therefore by the 3G transmitting video data of single node, the continuous transmission of video data cannot be ensured.
Summary of the invention
Technical problem to be solved by this invention, be the technological deficiency overcoming prior art existence, propose a kind of wireless video information multi-path transmission method based on 3G network, take the forwarding video data of multipath, thus improve definition and the real-time of video data transmission.
Basic ideas: in actual applications, just can send video data when radio video sensor node only captures abnormal conditions, and generally, node carries out some perception activities, do not need to transmit video data.So we can utilize these not have in harness node to carry out the forwarding of video data, thus improve the bandwidth of network, improve the real-time of video data, provide good QoS to ensure.
The present invention is based on the wireless video information multi-path transmission method of 3G network, the steps include:
Radio video sensor node in region is formed a self-organizing network by wifi; Each node is except with except adjacent node communication, communicating with long-range video receiver by 3G network;
(1) when in region, event occurs, in self-organizing network, certain radio video sensor node Na captures this event, node Na to start video data by oneself 3G module in real time to client transmission, broadcast La gives other neighbouring nodes simultaneously, and in network, other node comprises N
1, N
2... N
n;
(2) the node N near
1, N
2... N
nafter receiving the message La that Na sends, if oneself does not work, namely do not transmit video data, just reply message Ra to node Na, representing oneself can forwarding video data, and continues broadcast;
(4) node Na once receive reply message Ra number equal M after (M is according to the demand dynamic adjustments of network condition and video flowing), the message later received is given up, namely adopts M the node previously transmitted a reply message to carry out the forwarding of video data;
(5) node Na and above-mentioned node N
1, N
2..., N
mcarry out tcp connection by wifi, then video data is divided into M+1 part by node, every part of upper relevant information of mark, then to M+1 node to carry out forwarding (comprising oneself and M node); Video data is sent to client by 3G network by M+1 node;
(6) in client, user receives from M+1 node data, carries out video data rearrangement, and shows in real time.
The finite energy of radio video sensor node, and energy mainly consumes in communication module, in the inventive method, under normal circumstances, node does not carry out video data transmission, and when event occurs, node just can transmit video data.This method fully takes into account the internodal cooperation of radio video sensor in region, when event occurs time, node around event can transmit video data, other nodes are then in the rest period, utilize these idle node forwarding video datas, and add forwarding mechanism and the feedback mechanism of multichannel warp.Compared with other method, node adds wifi module for the communication between node, significantly enhances the real-time of transmission of video and improves QoS guarantee (bandwidth of transmission of video).
Accompanying drawing explanation
The deployment architecture figure of the specific embodiments interior joint of Fig. 1, expression the inventive method, its interior joint Na represents the radio video sensor node sending video data, and node Nb represents that auxiliary node Na sends the radio video sensor node of video data.Node Na is connected by wifi with node Nb, and is all connected with client by 3G network separately.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further details.
Suppose the deployment of the radio video sensor node in region as shown in Figure 1, node Na has perceived event, so we use another one node Nb auxiliary node Na to carry out the forwarding of video data, sends video to client in real time.It is below the concrete implementation step of this invention in this case.
(1) first node Na transmits video data by the 3G module of oneself immediately, simultaneously broadcast La.
(2), after the node Nb near receives message La, now suppose that node Nb does not work, and does not namely transmit video data, reply message Ra to node Na, representing oneself can forwarding video data.
(3) node Nb sets up tcp with node Na by wifi network and links.
(4) node Na sends video data to node Nb by wifi self-organizing network, and video data is sent to data terminal by 3G network by node Nb.
(5) after node Nb sends data, node Nb sends Mo message to node Na.
(6), after node Na receives Mo message, as there being video data etc. to be sent again, step (5) is forwarded to.
(7) node Na video data sends complete.
In invention, detailed design is carried out to the software of node Na, node Na has been provided with a waiting list Q, each element in queue Q is E(ip, port), its expression wifi network address is that the node of ip sends video data, waits for that Na sends data to it.If waiting list Q non-NULL, then node Na gathers one-frame video data, sends to the node that head of the queue is corresponding, then removes head of the queue element.If there is node to send on message Mo to node Na, node Na is inserted into waiting list tail of the queue.So in fact constitute by forward node feedback message to the feedback mechanism of sensing node (gathering the node of video data).Owing to being communicated by wifi between node, there is the bandwidth speed of 11Mbps in theory, and the bandwidth of 3G network is actual in 1Mbps, if therefore node Na continuously sends data to forward node, during forward node use 3G network forwarding video data, video data can be caused to have little time to forward, and then cause the loss of data.This feedback mechanism is used then to overcome so a kind of situation.
Claims (1)
1., based on a wireless video information multi-path transmission method for 3G network, the steps include:
Radio video sensor node in region is formed a self-organizing network by wifi; Each node, except except adjacent node is set up and communicated, to be set up with long-range video receiver by 3G network and is communicated;
A () is when in region, event occurs, in self-organizing network, certain radio video sensor node Na captures this event, node Na to start video data by oneself 3G module in real time to client transmission, broadcast La gives other neighbouring nodes simultaneously, and in self-organizing network, other node comprises N
1, N
2... N
n;
(b) node N
1, N
2... N
nafter receiving the message La that Na sends, if oneself does not transmit video data, just reply message Ra to node Na, representing oneself can forwarding video data, and continues broadcast;
C () node Na once receive replys after message Ra number equals M, give up the message received later;
(d) node Na and above-mentioned node N
1, N
2..., N
mcarry out tcp connection by wifi, then video data is divided into M+1 part by node, and every part of upper relevant information of mark, is then distributed to oneself and M the node previously transmitted a reply message; Video data is sent to client by 3G network by M+1 node.
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| CN201210398948.8A CN102857829B (en) | 2012-10-19 | 2012-10-19 | Wireless video information multi-path transmission method based on third-generation (3G) network |
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| CN201210398948.8A CN102857829B (en) | 2012-10-19 | 2012-10-19 | Wireless video information multi-path transmission method based on third-generation (3G) network |
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| CN102857829B true CN102857829B (en) | 2015-03-11 |
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| US20140215546A1 (en) * | 2013-01-29 | 2014-07-31 | The Boeing Company | Systems and methods for video distribution |
| CN108471634B (en) * | 2018-05-11 | 2020-04-14 | 浙江大学 | Video transmission method based on LTE network and Ad Hoc network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101175022A (en) * | 2006-10-31 | 2008-05-07 | 中兴通讯股份有限公司 | Wireless Ad hoc network multimedia video transmission routing method |
| CN102223671A (en) * | 2010-04-15 | 2011-10-19 | 华为技术有限公司 | Method and communication equipment for data transmission in wireless multihop network |
| CN102457727A (en) * | 2010-10-28 | 2012-05-16 | 武汉磐大科技有限公司 | Multi-channel transmission method of H.264 video frame for 3G network |
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| US9100832B2 (en) * | 2009-10-30 | 2015-08-04 | Airhop Communications, Inc. | Method and apparatus for self organized network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101175022A (en) * | 2006-10-31 | 2008-05-07 | 中兴通讯股份有限公司 | Wireless Ad hoc network multimedia video transmission routing method |
| CN102223671A (en) * | 2010-04-15 | 2011-10-19 | 华为技术有限公司 | Method and communication equipment for data transmission in wireless multihop network |
| CN102457727A (en) * | 2010-10-28 | 2012-05-16 | 武汉磐大科技有限公司 | Multi-channel transmission method of H.264 video frame for 3G network |
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