CN105681931A - Video data packet transmission method and system based on wireless network - Google Patents

Abstract

The invention relates to a video data packet transmission method and system based on a wireless network. The method comprises that a source node extracts metadata of a current video frame; the source node obtains the weights of the data packets in the current video frame according to the metadata and the types of video frame data packets; a forwarding node or a destination node schedules each data packet in different priority queues according to the weights of the data packets in the current video frame and the length of each priority queue, thus transmitting the video data packets; wherein the metadata comprise a video frame structure, a video frame type and the location of the video frame in a GOP (Group of Pictures); and each video frame is divided into a frame header data packet and frame content data packets. According to the method and the system provided by the invention, the data packet with the higher weight can be sent through the high priority queue in a greater probability; the probability of the data packet with the lower weight to compete for the high priority queue is relatively low; the channel utilization rate is improved; and the video transmission quality is improved.

Description

A kind of video data package transmission method based on wireless network and system

Technical field

The present invention relates to wireless network technical field of video transmission, particularly relate to a kind of video data package transmission method based on wireless network and system.

Background technology

Commercial production monitoring is had higher requirement by the futurity industry of network digital. Video monitoring becomes wherein most important also the most frequently used monitoring means with the friendly of the rich of its information He user. But, in the commercial production of many extreme environments, such as oil field, mine etc., it tends to be difficult to even cannot dispose wired video monitoring system. In such a scenario, based on the transmission of video of wireless multi-hop network and monitoring system, there is advantageous application advantage.

But under extreme conditions dispose wireless multi-hop Video transmission system and there is many challenges. The particularly transmission of distance, high temperature or the deployed environment such as low temperature environment, serious dust storm are all likely to the transmission performance of wireless network is caused extreme influence. Meanwhile, the performance requirement of wireless multi-hop video delivery network is but very high, is generally all at the monitoring large-scale network of regional deployment on a large scale, realizes the transmission of video of low latency and high reliability under uncertain link-quality. Therefore, how to ensure that video transmission quality in the wireless network is that Industrial CCTV is successfully crucial.

Research for WLAN transmission of video is very many, has and is successively suggested about the algorithm of service quality, agreement and standard in a large number. Such as, IEEE802.11e wireless transmission protocol defines EDCA video dispatching mechanism, the packet of different weights is placed in different priority queries (as shown in Figure 2). IEEE802.11e defines four priority queries, i.e. AC (0), AC (1), AC (2), AC (3), each queue has different access parameters when competing wireless channel, including congestion window, packet interval, continuously transmits duration etc., thereby results in different channel access priority. In the EDCA of acquiescence, AC (0) (AC_BK in corresponding diagram 2) is used for transmitting background data, AC (1) (AC_BE in corresponding diagram 2) is used for transmitting best endeavors (bestefforts) business, AC (2) (AC_VI in corresponding diagram 2) and AC (3) (AC_VO in corresponding diagram 2) and is respectively used to output video data and voice data.Four queues are AC (3) according to priority order from high to low > AC (2) > AC (1) > AC (0). Specifically, sound and video data are endowed higher priority, are transmitted by the queue of higher priority.

On the other hand, the classification coding techniques the such as H.264 development of technical field of video coding occurs in that such as, MPEGE-4, video data is encoded as the frame of video of different weight. Therefore, hierarchical coding is together with IEEE802.11e, and the cross layer design for transmission of video service quality guarantee is laid a good foundation: frame of video high for weight is put into the queue of high priority to improve the video transmission quality in bandwidth deficiency situation.

In the video spatial scalable coding techniques such as H.264, frame of video is by basic picture frame group (GroupofPictures, GOP) composition, each picture frame group is made up of frame type three kinds different: I frame (intracodedframe), P frame (predictivecodedframe), B frame (bi-predictivecodedframe), each of which GOP, by an I frame, is followed by a number of P frame and the B frame that are alternately present. Generally, the structure of a picture frame can be denoted as G (N, M), and wherein N is frame number total in this GOP, and M is the frame number (distances equal between two P frames) between I frame and P frame. As it is shown in figure 1, G (12,3) represents that one group of gop structure is for " IBBPBBPBBPBB ".

The weight that different types of frame decodes for video is different. I frame is first frame of one group of GOP, is also compress the lightest frame, contains all information decoding this frame, is thus independent on any other Frame in identical GOP. Difference between P frame storage present frame and previous I frame or P frame, it is therefore desirable to the information of its leading I frame or P frame could completely decode. B frame is the frame that in GOP, compression ratio is maximum, its encoding and decoding depend on before and after I frame and P frame as reference data. It will be apparent that for decoding video sighting distance, the weight of I frame is higher than P frame, and P vertical frame dimension is in B frame.

There is many limitations in the frame of video priority scheduling mechanism of the existing EDCA of including, such as only distinguish video data and non-video data, only distinguish different video frame type, do not consider queue length etc., these factors all cause under the wireless network environment of Bandwidth-Constrained, and the QoS of transmission of video can not get effective guarantee.

Traditional video data dispatch map mechanism includes static mappings mechanism and dynamic mapping mechanism two classes. The Frame of a certain type is put into some queue by static mappings mechanism regularly, and in dynamic mapping mechanism, then considering frame type and the congestion window of queue, the queue length etc. of Frame, the Frame of each type all has probability and is placed into any one queue (as shown in Figure 3).

But existing method of transmitting video data does not consider the weight difference of the frame of same type diverse location, do not consider the difference of different frame head packets and content frame packet in same frame of video yet. Therefore channel resource is not maximally utilized, and the video quality of output is it cannot be guaranteed that best.

Summary of the invention

The technical problem to be solved is: the existing problem that method of transmitting video data channel utilization is low, video quality is poor based on wireless network.

For solving above-mentioned technical problem, one aspect of the present invention proposes a kind of based on wireless network video data package transmission method, and the method includes:

Source node extracts the metadata of current video frame;

Source node obtains the weight of packet in current video frame according to the type of described metadata and described video requency frame data bag;

Each data packet dispatching is entered different priority queries according to the weight of the packet of current video frame and the length of each priority query by forward node or destination node, to carry out the transmission of video data bag;

Wherein, described metadata includes video frame structure, video frame type and the frame of video position in GOP; Each frame of video is divided into frame head data bag and content frame packet.

Alternatively, described source node includes according to the weight of packet in the type acquisition current video frame of described metadata and described video requency frame data bag:

The first weight according to position acquisition frame of video in GOP of video frame structure, video frame type and frame of video;

The first weight according to frame of video determines the frame head data bag of frame of video and the weight of content frame packet;

Wherein, the first Weight weight increment that weight is this frame of video of the frame head data bag of frame of video; First weight that weight is this frame of video of the content frame packet of frame of video.

Alternatively, the first weight of the described position acquisition frame of video according to video frame structure, video frame type and frame of video in GOP includes:

First weight of I frame is 1;

The number of frames affected by present frame in front and back frame according to P frame obtains the first weight of P frame with the number of frames affecting present frame;

The number of frames affected by present frame in front and back frame according to B frame obtains the first weight of B frame with the number of frames affecting present frame.

Alternatively, described the first weight according to the number of frames affected by present frame in the front and back frame of P frame and the number of frames acquisition P frame affecting present frame, including:

The first weight of P frame is obtained according to formula one:

$w=g\left(f_0{\mathrm{\α}}^{f_1}\right),$ Formula one

Wherein, f₀For the number of frames affected by present frame, f₁For affecting the number of frames of present frame, α ∈ (0,1), is regulate f₀And f₁The factor of influence coefficient, f₀>=1, f₁>=1; G (x) is a monotonically increasing function.

Alternatively, described the first weight according to the number of frames affected by present frame in the front and back frame of B frame and the number of frames acquisition B frame affecting present frame, including:

The first weight of B frame is obtained according to formula two:

$w=g\left(f_0{\mathrm{\α}}^{f_1}\right),$ Formula two

Wherein, f₀For the number of frames affected by present frame, f₁For affecting the number of frames of present frame, α ∈ (0,1), f₀>=1, f₁>=1; G (x) is monotonically increasing function.

Alternatively, monotonically increasing function g (x) definition is as follows:

G (x)=a (log (x)+b)+b₀,

Wherein, b₀It is a base line value, $a=\frac{1-b_0}{\log \left(N\right)-\log \left({\mathrm{\α}}^{\frac{N}{M}}\right)},b=-\log \left({\mathrm{\α}}^{\frac{N}{M}}\right);$ Log (N) andRespectivelyMaximum and minima;

For pth the P frame in GOP, f₀=N+M-1-M*p, f₁=p, for any B frame after this P frame, before next P frame, f₀=1, f₁=min{p+2, N/M}; For the B frame between I frame and first P frame, f₁=2; For any B frame between I frame and first P frame, p=0; N and M is the integer more than 0.

Alternatively, each data packet dispatching is entered different priority queries and includes by the weight of the described packet according to frame of video and the length of each priority query:

Current video frame according to the priority each priority query of sequential search from high to low, is called in corresponding priority query according to the current queue size of the weight of frame of video, the maximum queue length of each priority query and each priority query by the weight of the packet according to frame of video.

Alternatively, current video frame is called in corresponding priority query and is included by the described weight according to frame of video, the maximum queue length of each priority query and the current queue size of each priority query:

If the packet of current video frame meets the following conditions, the packet of current video frame is called in this priority query;

W*threshold (i) > qlen (i),

Wherein, w is the weight of the packet of current video frame, and threshold (i) is maximum queue length, and qlen (i) is current queue size.

Another aspect of the present invention proposes a kind of video data packet transmission system based on wireless network, and this system includes:

Metadata extraction unit, for extracting the metadata of current video frame;

Packet Weight Acquisition unit, obtains the weight of packet in current video frame for the type according to described metadata and described video requency frame data bag;

Priority Queuing unit, enters different priority queries for the weight of packet and the length of each priority query according to current video frame by each data packet dispatching, to carry out the transmission of video data bag;

Wherein, described metadata includes video frame structure, video frame type and the frame of video position in GOP; Each frame of video is divided into frame head data bag and content frame packet.

Alternatively, described packet Weight Acquisition unit includes the first Weight Acquisition module and packet weight determination module;

Described first Weight Acquisition module is for the first weight according to position acquisition frame of video in GOP of video frame structure, video frame type and frame of video;

Described packet weight determination module determines the frame head data bag of frame of video and the weight of content frame packet for the first weight according to frame of video;

Wherein, the first Weight weight increment that weight is this frame of video of the frame head data bag of frame of video; First weight that weight is this frame of video of the content frame packet of frame of video.

Video data package transmission method based on wireless network provided by the invention and system, the position of the type of frame of video, frame of video is considered when determining the weight of video data bag, and same frame of video is distinguished frame head data bag and content frame packet, this video data package transmission method and system ensure that the packet that weight is more high is had bigger probability and sent by high-priority queue, the probability of the data packet competition high-priority queue that weight is relatively low is then relatively small, improve channel utilization, improve the quality of transmission of video.

Accompanying drawing explanation

Being more clearly understood from the features and advantages of the present invention by reference accompanying drawing, accompanying drawing is schematic and should not be construed as and the present invention is carried out any restriction, in the accompanying drawings:

Fig. 1 illustrates the schematic diagram of one group of picture frame group in existing hierarchical coding;

Fig. 2 illustrates the schematic diagram of existing EDCA medium priority queue;

Fig. 3 illustrates static mappings mechanism and the difference schematic diagram of dynamic mapping mechanism;

Fig. 4 illustrates the schematic diagram of the video data package transmission method based on wireless network of one embodiment of the invention;

Fig. 5 illustrates the fundamental diagram of the video data package transmission method based on wireless network of one embodiment of the invention;

Fig. 6 illustrates the cross layer design displaying figure of the video data package transmission method based on wireless network of one embodiment of the invention;

Fig. 7 illustrates the structural representation of the video data packet transmission system based on wireless network of one embodiment of the invention.

Detailed description of the invention

Below in conjunction with accompanying drawing, embodiments of the present invention is described in detail.

In wireless multi-hop network, the node producing video data is commonly called source node, and the node receiving video data is referred to as aggregation node or destination node, and other nodes are then as the effect of forward node.

Fig. 4 is the schematic diagram of the video data package transmission method based on wireless network of one embodiment of the invention. As shown in Figure 4, should include based on the video data package transmission method of wireless network:

S41: source node extracts the metadata of current video frame;

S42: source node obtains the weight of packet in current video frame according to the type of described metadata and described video requency frame data bag;

S43: each data packet dispatching is entered different priority queries according to the weight of the packet of current video frame and the length of each priority query by forward node or destination node, to carry out the transmission of video data bag;

Wherein, described metadata includes video frame structure, video frame type and the frame of video position in GOP; Each frame of video is divided into frame head data bag and content frame packet.

The video data package transmission method based on wireless network of the present embodiment, the position of the type of frame of video, frame of video is considered when determining the weight of video data bag, and same frame of video is distinguished frame head data bag and content frame packet, this video data package transmission method and system ensure that the packet that weight is more high is had bigger probability and sent by high-priority queue, the probability of the data packet competition high-priority queue that weight is relatively low is then relatively small, improve channel utilization, improve the quality of transmission of video.

In the optional embodiment of one, described source node obtains the weight of packet in current video frame according to the type of described metadata and described video requency frame data bag and includes:

The first weight according to position acquisition frame of video in GOP of video frame structure, video frame type and frame of video;

The first weight according to frame of video determines the frame head data bag of frame of video and the weight of content frame packet;

Wherein, the first Weight weight increment that weight is this frame of video of the frame head data bag of frame of video; First weight that weight is this frame of video of the content frame packet of frame of video.

Further, the first weight of the described position acquisition frame of video according to video frame structure, video frame type and frame of video in GOP includes:

First weight of I frame is 1;

The number of frames affected by present frame in front and back frame according to P frame obtains the first weight of P frame with the number of frames affecting present frame;

The number of frames affected by present frame in front and back frame according to B frame obtains the first weight of B frame with the number of frames affecting present frame.

Alternatively, described the first weight according to the number of frames affected by present frame in the front and back frame of P frame and the number of frames acquisition P frame affecting present frame, including:

The first weight of P frame is obtained according to formula one:

$w=g\left(f_0{\mathrm{\α}}^{f_1}\right),$ Formula one

Wherein, f₀For the number of frames affected by present frame, f₁For affecting the number of frames of present frame, α ∈ (0,1), is regulate f₀And f₁The factor of influence coefficient, f₀>=1, f₁>=1; G (x) is a monotonically increasing function.

The weight definition of packet is the weights coefficient of 0 to 1. I frame has the highest importance, and its packet weight is also the highest, is designated as w=1.

Alternatively, described the first weight according to the number of frames affected by present frame in the front and back frame of B frame and the number of frames acquisition B frame affecting present frame, including:

The first weight of B frame is obtained according to formula two:

$w=g\left(f_0{\mathrm{\α}}^{f_1}\right),$ Formula two

Wherein, f₀For the number of frames affected by present frame, f₁For affecting the number of frames of present frame, α ∈ (0,1), f₀>=1, f₁>=1;G (x) is monotonically increasing function.

Wherein, α ∈ (0,1) regulates f₀And f₁The factor of influence coefficient, f₀>=1 (all of P frame and B frame all affect himself to I haven't seen you for ages), f₁>=1 (each frame is all affected to I haven't seen you for ages by I frame), g (x) is a monotonically increasing function so that if a certain frame is relied on by more multiframe relies both on more few frame, then its weight is more high. More intuitively saying generally occur frame more early in GOP, its weight is more high. In other words, same kind of Frame, its weight additionally depends on gop structure and it position occurs.

In order to reduce the computation complexity of packet importance, monotonically increasing function g (x) definition is as follows:

G (x)=a (log (x)+b)+b₀,

Accordingly, for the packet in P frame or B frame, its importance is

W=a (logf₀+f₁logα+b)+b₀)

Herein, b₀It is a base line value, for promoting the importance weight of the packet in B frame, so that its queue having an opportunity to enter higher priority. A, b, b₀Three coefficients make w ∈ [b jointly₀, 1], wherein the value definition of a, b is as follows:

$a=\frac{1-b_0}{\log \left(N\right)-\log \left({\mathrm{\α}}^{\frac{N}{M}}\right)},b=-\log \left({\mathrm{\α}}^{\frac{N}{M}}\right)$

Wherein log (N) andRespectivelyMaximum and minima;

For pth the P frame in GOP, f₀=N+M-1-M*p, f₁=p; For any B frame of (but before next one and p+1 P frame), f after this P frame₀=1, f₁=min{p+2, N/M}; For the B frame between I frame and first P frame, f₁=2, namely these B frames only rely upon I frame and first P frame. Or equivalently, for any B frame between I frame and first P frame, it is possible to look p=0; N and M is the integer more than 0.

In the present embodiment, it is intended to optimizing under limited bandwidth network condition, optimize the video quality of receiving terminal output, four priority queries as shown in Figure 2 all will be used to video data transmission.

Each data packet dispatching is entered different priority queries and includes by the weight of the described packet according to frame of video and the length of each priority query:

Current video frame according to the priority each priority query of sequential search from high to low, is called in corresponding priority query according to the current queue size of the weight of frame of video, the maximum queue length of each priority query and each priority query by the weight of the packet according to frame of video.

Specifically, current video frame is called in corresponding priority query and is included by the described weight according to frame of video, the maximum queue length of each priority query and the current queue size of each priority query:

If the packet of current video frame meets the following conditions, the packet of current video frame is called in this priority query;

W*threshold (i) > qlen (i),

Wherein, w is the weight of the packet of current video frame, and threshold (i) is maximum queue length, and qlen (i) is current queue size.

In actual applications, it is first according to priority order from high to low and is examined in each AC queue. Once find that some AC queue has sufficient spatial cache, then stop checking and this packet being put into this AC. Specifically, for each AC queue AC (i), defining its maximum queue length is threshold (i), and current queue size is qlen (i). The weights assuming certain packet to be sent are w, for queue AC (i), if met

W*threshold (i) > qlen (i),

Then this packet is inserted queue AC (i); Otherwise, the state of next priority query is continued checking for, until finding the AC queue meeting above-mentioned condition.If some packet all cannot meet above-mentioned condition for AC (3), AC (2) and AC (1), then without being verified directly putting it to AC (0).

Fig. 5 illustrates the fundamental diagram of the video data package transmission method based on wireless network of one embodiment of the invention; Fig. 6 illustrates the cross layer design displaying figure based on wireless network video data package transmission method of one embodiment of the invention. For above-mentioned video data package transmission method, the weight calculation of packet completes at source node, and is written into the tos field of packet, remains unchanged in repeating process. Forward node reads corresponding weight from the tos field of packet, determines this packet by what channel is sent according to the queue length of present node and channel status.

Fig. 7 illustrates the structural representation of the video data packet transmission system based on wireless network of one embodiment of the invention. As it is shown in fig. 7, should include based on the video data packet transmission system of wireless network:

Metadata extraction unit 71, for extracting the metadata of current video frame;

Packet Weight Acquisition unit 72, obtains the weight of packet in current video frame for the type according to described metadata and described video requency frame data bag;

Priority Queuing unit 73, enters different priority queries for the weight of packet and the length of each priority query according to current video frame by each data packet dispatching, to carry out the transmission of video data bag;

Wherein, described metadata includes video frame structure, video frame type and the frame of video position in GOP; Each frame of video is divided into frame head data bag and content frame packet.

Described packet Weight Acquisition unit includes the first Weight Acquisition module and packet weight determination module;

Described first Weight Acquisition module is for the first weight according to position acquisition frame of video in GOP of video frame structure, video frame type and frame of video;

Described packet weight determination module determines the frame head data bag of frame of video and the weight of content frame packet for the first weight according to frame of video;

Wherein, the first Weight weight increment that weight is this frame of video of the frame head data bag of frame of video; First weight that weight is this frame of video of the content frame packet of frame of video.

The video data packet transmission system based on wireless network described in the present embodiment may be used for performing said method embodiment, and its principle is similar with technique effect, repeats no more herein.

Video data package transmission method based on wireless network provided by the invention and system, the position of the type of frame of video, frame of video is considered when determining the weight of video data bag, and same frame of video is distinguished frame head data bag and content frame packet, this video data package transmission method and system ensure that the packet that weight is more high is had bigger probability and sent by high-priority queue, the probability of the data packet competition high-priority queue that weight is relatively low is then relatively small, improve channel utilization, improve the quality of transmission of video.

Although being described in conjunction with the accompanying embodiments of the present invention, but those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such amendment and modification each fall within the scope being defined by the appended claims.

Claims (10)

1. the video data package transmission method based on wireless network, it is characterised in that including:

Source node extracts the metadata of current video frame;

Source node obtains the weight of packet in current video frame according to the type of described metadata and described video requency frame data bag;

Each data packet dispatching is entered different priority queries according to the weight of the packet of current video frame and the length of each priority query by forward node or destination node, to carry out the transmission of video data bag;

Wherein, described metadata includes video frame structure, video frame type and the frame of video position in GOP; Each frame of video is divided into frame head data bag and content frame packet.

2. the video data package transmission method based on wireless network according to claim 1, it is characterised in that described source node obtains the weight of packet in current video frame according to the type of described metadata and described video requency frame data bag and includes:

The first weight according to position acquisition frame of video in GOP of video frame structure, video frame type and frame of video;

The first weight according to frame of video determines the frame head data bag of frame of video and the weight of content frame packet;

Wherein, the first Weight weight increment that weight is this frame of video of the frame head data bag of frame of video; First weight that weight is this frame of video of the content frame packet of frame of video.

3. the video data package transmission method based on wireless network according to claim 2, it is characterised in that the first weight of the described position acquisition frame of video according to video frame structure, video frame type and frame of video in GOP includes:

First weight of I frame is 1;

The number of frames affected by present frame in front and back frame according to P frame obtains the first weight of P frame with the number of frames affecting present frame;

The number of frames affected by present frame in front and back frame according to B frame obtains the first weight of B frame with the number of frames affecting present frame.

4. the video data package transmission method based on wireless network according to claim 3, it is characterised in that described the first weight according to the number of frames affected by present frame in the front and back frame of P frame and the number of frames acquisition P frame affecting present frame, including:

The first weight of P frame is obtained according to formula one:

$w=g\left(f_0{\mathrm{\α}}^{f_1}\right),$ Formula one

Wherein, f₀For the number of frames affected by present frame, f₁For affecting the number of frames of present frame, α ∈ (0,1), is regulate f₀And f₁The factor of influence coefficient, f₀>=1, f₁>=1; G (x) is a monotonically increasing function.

5. the video data package transmission method based on wireless network according to claim 3, it is characterised in that described the first weight according to the number of frames affected by present frame in the front and back frame of B frame and the number of frames acquisition B frame affecting present frame, including:

The first weight of B frame is obtained according to formula two:

$w=g\left(f_0{\mathrm{\α}}^{f_1}\right),$ Formula two

Wherein, f₀For the number of frames affected by present frame, f₁For affecting the number of frames of present frame, α ∈ (0,1), f₀>=1, f₁>=1; G (x) is monotonically increasing function.

6. the video data package transmission method based on wireless network according to claim 4 or 5, it is characterised in that monotonically increasing function g (x) definition is as follows:

G (x)=a (log (x)+b)+b₀,

Wherein, b₀It is a base line value, $a=\frac{1-b_0}{\log \left(N\right)-\log \left({\mathrm{\α}}^{\frac{N}{M}}\right)},b=-\log \left({\mathrm{\α}}^{\frac{N}{M}}\right);$ Log (N) andRespectivelyMaximum and minima;

For pth the P frame in GOP, f₀=N+M-1-M*p, f₁=p, for any B frame after this P frame, before next P frame, f₀=1, f₁=min{p+2, N/M}; For the B frame between I frame and first P frame, f₁=2; For any B frame between I frame and first P frame, p=0; N and M is the integer more than 0.

7. the video data package transmission method based on wireless network according to claim 1, it is characterised in that each data packet dispatching is entered different priority queries and includes by the described weight of the packet according to frame of video and the length of each priority query:

Current video frame according to the priority each priority query of sequential search from high to low, is called in corresponding priority query according to the current queue size of the weight of frame of video, the maximum queue length of each priority query and each priority query by the weight of the packet according to frame of video.

8. the video data package transmission method based on wireless network according to claim 7, it is characterized in that, current video frame is called in corresponding priority query and is included by the described weight according to frame of video, the maximum queue length of each priority query and the current queue size of each priority query:

If the packet of current video frame meets the following conditions, the packet of current video frame is called in this priority query;

W*threshold (i) > qlen (i),

Wherein, w is the weight of the packet of current video frame, and threshold (i) is maximum queue length, and qlen (i) is current queue size.

9. the video data packet transmission system based on wireless network, it is characterised in that including:

Metadata extraction unit, for extracting the metadata of current video frame;

Packet Weight Acquisition unit, obtains the weight of packet in current video frame for the type according to described metadata and described video requency frame data bag;

Priority Queuing unit, enters different priority queries for the weight of packet and the length of each priority query according to current video frame by each data packet dispatching, to carry out the transmission of video data bag;

Wherein, described metadata includes video frame structure, video frame type and the frame of video position in GOP; Each frame of video is divided into frame head data bag and content frame packet.

10. the video data packet transmission system based on wireless network according to claim 9, it is characterised in that described packet Weight Acquisition unit includes the first Weight Acquisition module and packet weight determination module;

Described first Weight Acquisition module is for the first weight according to position acquisition frame of video in GOP of video frame structure, video frame type and frame of video;

Described packet weight determination module determines the frame head data bag of frame of video and the weight of content frame packet for the first weight according to frame of video;

Wherein, the first Weight weight increment that weight is this frame of video of the frame head data bag of frame of video; First weight that weight is this frame of video of the content frame packet of frame of video.