CN104159164A - Wireless cooperation method for reducing synchronization delay of multi-view video stream - Google Patents
Wireless cooperation method for reducing synchronization delay of multi-view video stream Download PDFInfo
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- CN104159164A CN104159164A CN201410428634.7A CN201410428634A CN104159164A CN 104159164 A CN104159164 A CN 104159164A CN 201410428634 A CN201410428634 A CN 201410428634A CN 104159164 A CN104159164 A CN 104159164A
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Abstract
The present invention provides a wireless cooperation method for reducing synchronization delay of multi-view video stream: each multicast receiving node independently judges whether the cooperation communication needs to be started; multicast error nodes broadcast a relay requesting message to spare relay nodes and various spare relay nodes respond after receiving the relay requesting message; the multicast error nodes select one from all the responded spare relay nodes as a cooperation relay node according to channel delay and the like. This solution can avoid a potential problem of node bandwidth overflow caused by cooperation node selection and improves the transmission performance for multicast services.
Description
Technical field
The present invention relates to communication technical field, relate in particular to the wireless cooperation technology of multiple vision point video stream synchronization delayed time in a kind of Internet Transmission of rebuilding for reducing wireless space multi-view point video.
Background technology
The network communications technology and video coding technique have promoted the transformation of video and multimedia technology application pattern.A kind of by binocular or multi-vision visual signal when three-dimensional video-frequency, make people can experience the multimedia form of strong stereoscopic vision impact effect.Its using value at aspects such as amusement, education, military affairs becomes the study hotspot in multimedia and fields such as communicating by letter.
In stereo reconstruction technology based on the input of multichannel source view, an important direction is the stereo reconstruction based on various visual angles free stereo technology.The main application of this class application is experienced as occasions such as video conferences with needing immersion solid.For example: Microsofts in 2005 are used the real-time multi-view video system of interactive mode of 32 video cameras realizations.The video camera of the arc shooting that this system is spent by 32 spaces 5 is that 6.5 meters of circumference form around radius, and the direct broadcast function of switchable viewing angle can be provided for the user in IP network.
The huge video flowing of multi-view point video has caused huge pressure to Internet Transmission.For alleviating Internet Transmission pressure, traditional technology is: between multi-view point video, identical content adopts the identical part of multicast transmission of wireless network, and between viewpoint, the part of difference adopts unicast transmission.But wireless network can be subject to external interference, and have channel difference, each receiving node is larger because position difference makes to receive signal difference.For the auxiliary larger receiving node of error code, can utilize collaboration communication, improve the accuracy of the receiving node that error code is larger.At present, the collaboration communication mechanism of employing is mainly to pick out the node that the error rate is low, load is low to serve as cooperative node.
But in the scene of many viewpoint transmission, the image of rebuilding due to each acceptance point has certain correlation, each node is for rebuilding a special scenes service, therefore, the video that receiving node is rebuild must meet regular hour restriction, and prior art is difficult to meet the demands.
Summary of the invention
The object of the invention is for prior art defect, a kind of wireless cooperation method that reduces multiple vision point video stream synchronization delayed time is provided.
Technical solution of the present invention provides a kind of wireless cooperation method for reducing multiple vision point video stream synchronization delayed time, and each multicast reception node disjoint judges whether to start collaboration communication, be to carry out following steps as multicast error code node to set up collaboration communication,
Step 1, multicast error code node, to corresponding all via node broadcast relay request messages for subsequent use, are inserted the multicast service number that needs cooperation in relay request message; Receive the via node each for subsequent use of relay request message, insert in relay request response message self serving multicast service situation, and send relay request response message to multicast error code node;
Step 2, multicast error code node are selected one as collaboration relay node according to default optimization principles from the alternative via node of all loopback relay request response messages;
Step 3, multicast error code node send relay selection message to collaboration relay node;
Step 4, selected collaboration relay node receive after relay selection message, and loopback relay selection response message is to multicast error code node;
Step 5, receive after the relay selection response message of collaboration relay node when multicast error code node, trunking traffic mechanism has been set up.
And in step 3, the optimization principles of selecting collaboration relay node from the alternative via node of all responses is as follows,
1) collaboration relay node transmission error rates is minimum;
2) preferentially select multicast group interior nodes, and preferentially select node that the serviced multicast service node of registering in multicast group interior nodes is maximum as collaboration relay node;
3) the alternative via node of selecting channel latency D minimum is as collaboration relay node.
And, below occurring, when any situation, all open and survey via node for subsequent use,
(1), at the beginning of the network of many viewpoints multicast is set up, survey respectively the alternative via node of each multicast reception node;
(2), in the time that default time threshold arrives, again survey respectively the alternative via node of each multicast reception node.
(3) each multicast reception node of many viewpoints multicast detects the error rate at interval of certain hour, when having three testing results, certain multicast reception node exceedes corresponding error code thresholding, and do not adopt collaboration communication before, but corresponding via node for subsequent use is 0, need the via node for subsequent use of this multicast reception node to survey.
And each multicast reception node of many viewpoints multicast detects the error rate at interval of certain hour, in the time that certain multicast reception node detects I frame and makes mistakes, be considered as testing result and exceed corresponding error code thresholding.
And, arbitrary multicast reception node is surveyed to corresponding alternative via node and comprises following flow process,
Step 1, by multicast reception node to neighbours' via node broadcast relay probe message, and wait for;
Step 2, in the time that each neighbours' via node receives the relaying probe message that multicast reception node sends, respectively loopback relaying probe response message is to multicast reception node; In cooperation state information, comprise the multicast service number that can serve, and notebook data packet delivery time T
start, corresponding multicast service number and the multicast node number that can serve;
Step 3, receive after the relaying probe response message that neighbours' via node responds when multicast reception node, record current time of reception of T
end, calculate channel latency D=T
end-T
start, each neighbours' via node is registered relevant information get off as via node for subsequent use, complete the process of once surveying via node for subsequent use.
The present invention is minimum as selecting the Main Basis of collaboration services node taking time delay, and has proposed the wireless network collaboration communication mechanism of a set of reduction multiple vision point video stream synchronization delayed time.
Brief description of the drawings
Fig. 1 is the reconstruction result schematic diagram of the embodiment of the present invention.
Fig. 2 is detection unlocking condition (3) schematic diagram of the embodiment of the present invention.
Fig. 3 is the detection relaying secondary node flow chart of the embodiment of the present invention.
Fig. 4 is the cooperating process flow chart of the embodiment of the present invention.
Embodiment
Suppose the reconstruction structure of view system more than as shown in Figure 1: r0 is multicast group of branches node, and the multicast reception node in its downstream is d0～d4, a1 is multicast group exterior node; In figure, circle represents effective transmission range of r0.The packet that receives r0 transmission except d0 exists error code, and all the other each nodes all can correctly receive the packet that r0 sends.In the structure chart shown in Fig. 1, d0 can select d1 or the d2 via node as cooperation transmission.But d1, d2 are in different geographical position, and the interference difference, the load difference that are subject to, there are differences the multicast packetization delay that is transmitted to d0.For reducing many viewpoints synchronization delayed time, should select the node of time delay minimum in d1, d2 as via node.In figure, dotted line represents collaboration communication channel that can be newly-built.In the most severe situation, when existing when not eliminable interferences between d1, d2 and d0, and a1 retransmitting multi-casting is while dividing into groups to meet many viewpoints synchronization delayed time, can selection group exterior node a1 as via node.
Referring to Fig. 2, the cooperation of embodiment realizes needs via node for subsequent use:
Survey via node for subsequent use:
Entry condition:
(1), at the beginning of the network of many viewpoints multicast is set up, survey respectively the alternative via node of each multicast reception node;
(2), in the time that default corresponding time threshold arrives, again survey respectively the alternative via node of each multicast reception node.Because the former via node possible position for subsequent use of multicast reception node changes, can set at regular intervals, multicast reception node initiatively starts to survey via node for subsequent use, sets up collaboration communication mechanism use so that follow-up.
(3) in the error rate detects, find that the error rate of certain multicast reception node transfinites, but corresponding via node for subsequent use is 0, needs the via node for subsequent use of this multicast reception node to survey.
Collaboration communication is generally applied in the least significant end of multicast transmission direction, and multicast reception node is end node.Each end node of many viewpoints multicast detects the error rate at interval of certain hour.When having three testing results, certain end node exceedes corresponding error code thresholding, and do not adopt collaboration communication before, be designated as multicast error code node, need to start to set up collaboration communication mechanism, if now via node number for subsequent use is 0, active starts to survey via node for subsequent use, to continue to set up collaboration communication mechanism.Because multicast transmission main business is video flowing, the time interval is relevant to the video type of transmission, video flowing I frame, as independent decoded frame, can not be made mistakes, and the time interval of detecting the error rate while therefore specifically enforcement can be chosen as the I frame Mean Time Between Replacement of transmission of video.When whether the result of detection error code exceedes corresponding error code thresholding, also can whether make mistakes as criterion by I frame.In the time that certain multicast reception node detects I frame and makes mistakes in one-time detection, be considered as testing result and exceed corresponding error code thresholding once.
Referring to Fig. 2, when concrete enforcement, can be for arbitrary multicast reception node, exceed corresponding error code thresholding when having three testing results, further judge whether via node for subsequent use is 0, set up if not collaboration communication flow process, select collaboration relay node, complete the cooperating relay mechanism of setting up, if survey corresponding alternative via node, then return, do not exceed the in the situation that corresponding error code thresholding and via node for subsequent use being not 0 and enter and set up collaboration communication flow process three testing results, select collaboration relay node, complete the cooperating relay mechanism of setting up.
While there is above arbitrary situation, all open and survey via node for subsequent use.
Referring to Fig. 3, arbitrary multicast reception node is surveyed to corresponding alternative via node and comprises following flow process:
1, multicast reception node is broadcasted " relaying detection " message to neighbours' via node, and waits for.Receiving node in radio transmission range is neighbor node.Neighbours' via node i.e. the via node in multicast reception node neighbor location.
2, in the time that certain alternative via node receives " relaying detection " message of multicast reception node transmission, loopback " relaying probe response " message, comprise that the cooperation state information of loopback self is to multicast reception node, in cooperation state information, comprise the multicast service number that can serve, and notebook data packet delivery time T
start, corresponding multicast service number and the multicast node number that can serve.In the test data of " relaying probe response " the last additional regular length B of part.Recommending the length of B is 1000 bytes.
3, receive after " the relaying probe response message " that alternative via node responds when multicast reception node, record current time of reception of T
end, calculate channel latency and be designated as: D=T
end-T
start.Multicast reception node registers each neighbours' via node get off by relevant information as via node for subsequent use, completes the process of once surveying via node for subsequent use.
When concrete enforcement, each node, type of data packet, each packet, multicast service can adopt respectively corresponding label mark, those skilled in the art can designed, designed message format, and it is as follows that the concrete form that the related each message of via node process for subsequent use adopts is surveyed in suggestion:
Table 1: " relaying detection " message format
| Type of data packet numbering | Packet numbers | Sending node number |
| Relaying is surveyed type | Order is filled in | Multicast reception node |
Table 2: " relaying probe response " message format
The multicast nodes of serving of the corresponding multicast service n of " relaying probe response " message " multicast service n " field, represents that this node can be for the multicast reception node number of service.This value is higher, represents that this node can provide relay services for more multicast reception node.But be not necessarily to have so much node to need relay services.The multicast reception node number of Gong service corresponding to every kind of business is relevant with concrete network node relative position.
Each multicast reception node disjoint judges whether to start collaboration communication, sets up when needed collaboration communication.In embodiment, when detecting three error rates, certain end node interval certain hour of many viewpoints multicast exceedes thresholding, and store the information (being that via node number for subsequent use is not 0) of this node via node for subsequent use, this end node is multicast error code node, now and start to set up collaboration communication mechanism.
Referring to Fig. 4, each multicast error code node disjoint is carried out and is set up collaboration communication mechanism, comprises the following steps:
1, multicast error code node to via node for subsequent use broadcast " relay request " start relaying create a mechanism, in " relay request " message, insert need cooperation " multicast service number "; The via node for subsequent use that receives " relay request " message is inserted the situation of this node service multicast service in " relay request response " message respectively, to multicast error code node loopback " relay request response " message.The situation of this node service multicast service generally can comprise: the serviced multicast service nodes of the multicast service sum that can serve, the multicast service of serving number and corresponding registration.
As Fig. 1, d0 transfinites for three times owing to receiving error code, so broadcast " relay request " message.D0 time this each node via node for subsequent use includes node d1, d2 and group exterior node a1 etc.
Receive node d1, d2 and group exterior node a1 etc. on the multicast tree of " relay request " message to multicast error code node loopback " relay request response " message.
2, multicast error code node is selected a node according to optimization principles from the alternative via node of all loopbacks " relay request response " message, establishes the alternative via node being selected and is labeled as collaboration relay node.Those skilled in the art can set in advance optimization principles voluntarily, advise that multicast error code node is now selected the principle of collaboration relay node as follows:
1) collaboration relay node transmission error rates is minimum, and the error rate is generally in receiving terminal statistics, total number of error code number/transmission data of the error rate=test data;
2) preferentially select multicast group interior nodes, and preferentially select node that the serviced multicast service node of registering in multicast group interior nodes is maximum as collaboration relay node;
3) the alternative via node of selecting channel latency D minimum is as collaboration relay node.Channel latency D=T
end-T
startvalue size, represented the time length that need to spend to multicast error code node from alternative via node transmitted data amount B.Because video information is very responsive to the delay of time.Multicast error code node needs the data that simultaneously comprehensively oneself receive and the collaboration data that cooperates transmission, produces correct video data.If cooperation channel latency is larger, need multicast error code node to open up buffer memory more to store the multi-case data of error.Because video data is huge, larger channel latency easily causes data cached overflowing, and has increased again the delay and jitter of video, has reduced the quality of video reconstruction.Therefore, selecting when via node, select node that channel latency is less as via node as far as possible.Can comprehensive three principles select optimum node.
3, multicast error code receiving node sends " relay selection message " to collaboration relay node, and waits for.
4, collaboration relay node is returned to " relay selection response message ", registers multicast service number simultaneously, and " the multicast node number of service " added to 1 on the original basis, upgrades the serviced multicast service nodes of registration, and cooperative transmission data message." relay selection response " message has been specified via node number herein, waits for the agreement information that this node is beamed back.
The multicast node of " the multicast node number of service " described service refers to the all-multicast error code node that receives this collaboration relay node repeating signal.In order to distinguish different multicast services, relay selection response message can be registered multicast service number.Multicast service number is the digital or coding without repetition for distinguishing different multicast services, acts on the similar Automobile trade mark or personal telephone number.By multicast service number, can differentiate different multicast services.When concrete enforcement, can register the serviced multicast service nodes of multicast service number and corresponding registration, because being initiates cooperation request by receiving node, via node accepts request to be become after collaboration relay node, directly forward collaboration multi-case data.
5, in the time that multicast error code node is received " relay selection response " message of collaboration relay node, think that trunking traffic mechanism set up, can start the data message of processing from collaboration data subchannel simultaneously.
When concrete enforcement, each node, type of data packet, each packet, multicast service can adopt respectively corresponding label mark, those skilled in the art can designed, designed message format, sets up the concrete form that the related each message of collaboration communication mechanism process adopts as follows:
Table 3: " relay request " message format
Table 4: " relay request response " message format
Table 5: relay selection message format
Table 6: relay selection response message format
In each table, indicate the label when multiple with n, value is relevant with concrete condition.
When concrete enforcement, invention technician can preset each threshold value according to experiment or experience.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendments or supplement or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (5)
1. for reducing a wireless cooperation method for multiple vision point video stream synchronization delayed time, it is characterized in that: each multicast reception node disjoint judges whether to start collaboration communication, is to carry out following steps as multicast error code node to set up collaboration communication,
Step 1, multicast error code node, to corresponding all via node broadcast relay request messages for subsequent use, are inserted the multicast service number that needs cooperation in relay request message; Receive the via node each for subsequent use of relay request message, insert in relay request response message self serving multicast service situation, and send relay request response message to multicast error code node;
Step 2, multicast error code node are selected one as collaboration relay node according to default optimization principles from the alternative via node of all loopback relay request response messages;
Step 3, multicast error code node send relay selection message to collaboration relay node;
Step 4, selected collaboration relay node receive after relay selection message, and loopback relay selection response message is to multicast error code node;
Step 5, receive after the relay selection response message of collaboration relay node when multicast error code node, trunking traffic mechanism has been set up.
2. hide for overcoming the wireless multicast cooperative node selection method for building up disturbing according to claim 1, it is characterized in that: in step 3, the optimization principles of selecting collaboration relay node from the alternative via node of all responses is as follows,
1) collaboration relay node transmission error rates is minimum;
2) preferentially select multicast group interior nodes, and preferentially select node that the serviced multicast service node of registering in multicast group interior nodes is maximum as collaboration relay node;
3) the alternative via node of selecting channel latency D minimum is as collaboration relay node.
3. according to hiding the wireless multicast cooperative node disturbing and select method for building up for overcoming described in claim 1 or 2, it is characterized in that: below occurring, when any situation, all open and survey via node for subsequent use,
(1), at the beginning of the network of many viewpoints multicast is set up, survey respectively the alternative via node of each multicast reception node;
(2), in the time that default time threshold arrives, again survey respectively the alternative via node of each multicast reception node;
(3) each multicast reception node of many viewpoints multicast detects the error rate at interval of certain hour, when having three testing results, certain multicast reception node exceedes corresponding error code thresholding, and do not adopt collaboration communication before, but corresponding via node for subsequent use is 0, need the via node for subsequent use of this multicast reception node to survey.
4. hide for overcoming the wireless multicast cooperative node selection method for building up disturbing according to claim 3, it is characterized in that: each multicast reception node of many viewpoints multicast detects the error rate at interval of certain hour, in the time that certain multicast reception node detects I frame and makes mistakes, be considered as testing result and exceed corresponding error code thresholding.
5. hide for overcoming the wireless multicast cooperative node selection method for building up disturbing according to claim 3, it is characterized in that: arbitrary multicast reception node is surveyed to corresponding alternative via node and comprise following flow process,
Step 1, by multicast reception node to neighbours' via node broadcast relay probe message, and wait for;
Step 2, in the time that each neighbours' via node receives the relaying probe message that multicast reception node sends, respectively loopback relaying probe response message is to multicast reception node; In cooperation state information, comprise the multicast service number that can serve, and notebook data packet delivery time T
start, corresponding multicast service number and the multicast node number that can serve;
Step 3, receive after the relaying probe response message that neighbours' via node responds when multicast reception node, record current time of reception of T
end, calculate channel latency D=T
end-T
start, each neighbours' via node is registered relevant information get off as via node for subsequent use, complete the process of once surveying via node for subsequent use.
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Cited By (2)
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| CN109218739A (en) * | 2017-07-06 | 2019-01-15 | 阿里巴巴集团控股有限公司 | View angle switch method, apparatus, equipment and the computer storage medium of video flowing |
| CN113055092A (en) * | 2021-03-17 | 2021-06-29 | 卡斯柯信号有限公司 | Equipment and method for improving communication transmission safety of existing signal equipment |
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| CN103220035A (en) * | 2013-05-08 | 2013-07-24 | 华中师范大学 | Cooperative communication transmission method |
| CN103313141A (en) * | 2013-05-08 | 2013-09-18 | 华中师范大学 | Cooperative node selection establishment method for distribution type wireless multicast |
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