CN102957905B - High-definition video wireless transmission method and device - Google Patents

Abstract

A wireless transmission method and device for high-definition video is suitable for transmitting a data packet of a video frame of a high-definition video. The method includes receiving the video frame, wherein the video frame has a video frame size; obtaining a payload length and a minimum required transmission time associated with the video frame, wherein the minimum required transmission time is a minimum time limit required for transmitting the video frame to a receiving end; performing packet segmentation on the video frame according to the payload length to obtain the data packet; and scheduling the data packets according to the minimum required transmission time and transmitting the data packets to the receiving end. The invention can still accord with the delay condition without the error of the video picture when the wireless condition is worse, and can transmit the packet of the video picture by using the minimum required transmission time, thereby providing more users to watch the high-quality film in the limited bandwidth.

Description

High-definition video wireless transmission method and device

technical field

The present invention mainly relates to wireless transmission of high-definition (HD) video, and in particular to a method and device for scheduling and cutting high-definition video data packets in a media access control layer.

Background technique

High-definition (HD) video refers to a video with a higher resolution than a standard definition (SD) video, such as 1280×720 pixels (720pixel, 720p) or 1920×1080 pixels (1080i/1080p) screen resolution. High-definition (HD) video wireless transmission is mainly used to play high-definition digital video disc (Digital Video Disc, DVD), Blu-ray Disc (Blue-ray Disc), high-definition IP TV digital set-top box (HD IPTV Set-top box ) or high-definition movie projection, etc., can solve the problems of the lack of mobility of traditional wired transmission equipment, the need for expensive high-definition multimedia interface (High Definition Multimedia Interface, HDMI) transmission lines, and the inability to support one-to-many users.

At present, the proportion of digital high-definition TVs used at home is increasing. Through high-definition IP TV digital set-top boxes, multiple users can watch high-definition videos on different digital high-definition TVs at the same time, and avoid the need for layout The hassle of High Definition Multimedia Interface (HDMI) cables. FIG. 1 shows a communication model 100 for a household environment. The home environment communication model 100 includes a plurality of digital high-definition televisions 102 and a wireless high-definition IP television digital set-top box 104 . The wireless high-definition IP TV digital set-top box 104 can utilize various video frame formats (video frame format) (such as uncompressed or compressed data), various antenna technologies (such as single-input single-output (SISO) or multiple-input multiple-output (MIMO) ) and various video frame compression methods (such as JPEG2000 or mpeg) and other technologies to transmit the high-definition video to each digital high-definition television 102 respectively.

In the wireless transmission of high-definition video, the packet error rate (packet error rate) and the time it takes for each video frame to reach the receiving end (the wireless high-definition television 102 ) will affect the viewing quality. Among them, the limited bandwidth may affect the frame error rate (frame error rate) and the time for each video frame to reach the receiving end (the wireless high-definition television 102 ). In the existing wireless transmission method of high-definition video, a method of limiting packet error rate and a method of optimizing transmission volume are generally used for wireless transmission of high-definition video. In the method of limiting the packet error rate, in order to reduce the packet error rate (for example, the packet error rate is limited to less than 10 ^-2 ), the payload length of the packet is shortened, but additional information (overhead information) is added, so it is necessary more time to transmit. In the method of optimizing the throughput, since the data transmission rate required for the wireless transmission of the high-definition video is quite high, in order to increase the effective throughput (throughput) within the same time, the payload length of the packet is increased. Although the average transmission time of the method of optimizing the transmission volume is the shortest, the packet error rate is increased because the payload length of the packet becomes larger.

Contents of the invention

In view of the above-mentioned problems in the prior art, the present invention provides a method and device for wireless transmission of high-definition video, which can estimate a minimum required transmission time (Minimum Required Transmission Time, MRTT), and use the estimated Minimum Required Transmission Time (MRTT) for scheduling in the Medium Access Control layer (Medium Access Control layer, MAClayer).

A wireless transmission method of a high-definition video provided by an embodiment disclosed in the present invention is suitable for transmitting a data packet of a video frame of a high-definition video. The method includes receiving the video frame, the video frame having a video frame size; obtaining a payload length and a minimum required transmission time related to the video frame, wherein the minimum required transmission time is to transmit the video frame to a A minimum time limit required by the receiving end; performing packet segmentation on the video picture according to the payload length to obtain the data packet; and scheduling the data packet according to the minimum required transmission time and sending it to the receiving end.

A high-definition video wireless transmission device provided according to an embodiment of the present invention is suitable for transmitting a data packet of a video frame of a high-definition video. The device includes a video source module for receiving the above-mentioned video frame; a media access control control module for obtaining a payload length and a minimum required transmission time related to the above-mentioned video frame, wherein the above-mentioned minimum required transmission The time is a minimum time limit required for transmitting the above-mentioned video picture to a receiving end; a packetizing unit is used for packet cutting the above-mentioned video picture according to the above-mentioned payload length to obtain the above-mentioned data packet; and a media access control scheduler , used to schedule the data packets according to the minimum required transmission time, and output to a physical layer for transmission to the receiving end.

The present invention can still meet the delay condition when the wireless condition is poor and there will be no error in the video picture, and use the minimum required transmission time to transmit the packet of the video picture, which can provide more users to watch high-quality images within a limited bandwidth Film.

Description of drawings

Figure 1 shows a household environment communication model;

Fig. 2 shows a schematic diagram of video picture cutting;

FIG. 3 shows a flow chart of a method for wireless transmission of high-definition video according to an embodiment of the present invention;

FIG. 4 shows a flow chart of a method for wireless transmission of high-definition video according to another embodiment of the present invention;

Fig. 5 shows a high-definition video wireless transmission device according to an embodiment of the present invention;

Fig. 6 shows a high-definition video wireless transmission device according to another embodiment of the present invention;

FIG. 7 shows the minimum required transmission time when the signal-to-noise ratio is different between the high-definition video wireless transmission method according to an embodiment of the present invention and the prior art.

Wherein, the reference signs are explained as follows:

100～home environment communication model;

102～digital high-definition television;

104～Wireless high-definition IP TV digital set-top box;

200～Schematic diagram of video screen cutting

202～Video screen;

204～cutting blocks of video images;

300, 400～flow chart;

S302～S310, S402～S418～steps;

500, 600~ high-definition video wireless transmission device;

502, 602～video source module;

504, 604～media access control control module;

506, 610～packing unit;

508, 612～scheduler;

606～temporary video image storage unit;

608～transmission performance improvement unit;

614～transmission and measurement module.

detailed description

As mentioned above, in the wireless transmission of high-definition video, the packet error rate (packet error rate) and the time it takes for each video frame to reach the receiving end (such as the wireless high-definition television 102 ) will affect the viewing quality. Therefore, it is necessary to make appropriate adjustments to the length of the packet payload to be transmitted according to the real-time channel conditions, and can pass the retransmission in the media access control layer (MAC layer) when there is a video frame error. mechanism (e.g. I-ACK) to make corrections. The high-definition video wireless transmission method and device provided by the present invention can perform wireless transmission of compressed or uncompressed high-definition video on a smaller bandwidth, and can also use ultra-wideband (Ultra Wideband, UWB) technology or WiFi(11n) technology is used.

Generally speaking, assuming that the playing time of a high-definition video is 120 minutes, about 30 to 60 video frames (video frames) must be played every minute. The frame error rate (frame error rate) required to prevent video frame error (video frame error) during 120 minutes of high-definition video playback is a target frame error rate (target frame error rate), for example, a The target frame error rate for a 120-minute HD video is about 10 ^-6 . And when there is an error in the video frame, it can be corrected through the retransmission mechanism of the media access control layer. In addition, in order to maintain the playback quality of high-definition videos, the receiving end (eg wireless high-definition television 102) must be able to continuously receive video frames, so each video frame arrives at the receiving end (such as wireless high-definition TV 102) The time of the TV 102) can be estimated at the sending end (such as the wireless high-definition IP TV digital set-top box 104), and the sending end can make relevant scheduling according to the time when the video picture arrives at the receiving end, so as to avoid the delay of receiving the video picture at the receiving end. The wireless transmission method of high-quality video provided by the present invention can satisfy a delay constraint. Assuming that the frame rate of the wireless transmission of the high-definition video is 30 video frames per second, and the decoder buffer at the receiving end can only temporarily store one video frame, the delay condition is equal to every 1/30 second must send the next video picture to the decoding register at the receiving end. If the delay condition cannot be met, the decoding register at the receiving end may not be able to decode immediately, resulting in a video frame error.

FIG. 2 shows a schematic diagram 200 of video frame cutting. The video frame cutting diagram 200 includes a video frame 202 and a plurality of video frame cutting blocks 204 . As mentioned above, the frame transmission rate of the high-definition video wireless transmission can be 30 video frames per second, for example, 30 video frames 202 can be transmitted per second. The sending end (such as wireless high-definition IP TV digital set-top box 104) can cut the video picture 202 into a plurality of video picture cutting blocks 204, and then encapsulate the video picture cutting blocks 204 into packets respectively and send them to the receiving end (such as wireless high-definition picture quality TV 102).

In order to solve the problems of the prior art, an embodiment of the present invention provides a wireless transmission method for high-definition video. The wireless transmission method of the high-definition video can meet the target frame error rate (for example, 10 ⁻⁶ ) of the high-definition video. In particular, the wireless transmission method of high-quality video in an embodiment of the present invention defines a required transmission time (Required Transmission Time, RTT), and the required transmission time (RTT) is a time required for transmitting a video picture. time limit, and the required transmission time (RTT) can meet the target frame error rate (for example, 10 ⁻⁶ ). In addition to proposing the required transmission time (RTT), the high-quality video wireless transmission method of the present invention adjusts the payload length of the packet of the video frame and the Modulation and Coding Scheme (Modulation and Coding Scheme, for each video frame). MCS), so as to obtain a minimum required transmission time (Minimum Required Transmission Time, MRTT), wherein the minimum required transmission time (MRTT) is a minimum time limit required to transmit a video frame.

FIG. 3 shows a flowchart 300 of a method for wireless transmission of high-definition video according to an embodiment of the present invention. Firstly, a video frame is received, and the video frame has a video frame size (for example, 0.5Mb˜3Mb) (step S302). Next, obtain a payload length (payload length) and a corresponding minimum required transmission time (MRTT), wherein the minimum required transmission time is the time limit required for transmitting video frames (step S304). After obtaining the payload length and the corresponding minimum required transmission time, the video frame is divided into packets according to the payload length to obtain a data packet of the video frame (step S306). Finally, the data packets of the video frames are scheduled according to the minimum required transmission time, and transmitted to the receiving end (step S308).

In particular, the minimum required transmission time (MRTT) defined in the present invention can be as shown in the following formula 1:

Formula 1: $\underset{L,m}{\min }{N}_R\left(L\right)\×T(L,m)$

And meet the following conditions:

${\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}\left(\begin{array}{c}{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; R</span>}}\\ \mathrm{<span\; class="notranslate">\; i</span>}\end{array}\right)\mathrm{<span\; class="notranslate">\; P</span>}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&gamma;</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&times;</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&gamma;</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span>}^{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&le;</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}}$

${\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; D.</span>}}{\mathrm{<span\; class="notranslate">\; 8</span>}\mathrm{<span\; class="notranslate">\; L</span>}}$

L≥0

Wherein D=video frame size (bit, bits);

γ _s = signal to noise ratio (signal to noise ratio, SNR);

L = payload length (bytes, bytes);

m = modulation coding scheme (MCS);

P _e target frame error rate;

T() = the time required to transmit a packet, including additional information (overhead);

_NF = the number of packets cut into a video frame;

_NR = the number of packets required to transmit a video frame, including the retransmission part.

Formula 2:

$\mathrm{<span\; class="notranslate">\; Min</span>}<span\; class="notranslate">\; \{</span><span\; class="notranslate">\; [</span><span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; D.</span>}}{\mathrm{<span\; class="notranslate">\; 8</span>}\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ]</span><span\; class="notranslate">\; +</span>\frac{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; e</span>}<span\; class="notranslate">\; -</span>\sqrt{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; *</span><span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; D.</span>}}{\mathrm{<span\; class="notranslate">\; 8</span>}\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; *</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; CL</span>}}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; *</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; CL</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; *</span><span\; class="notranslate">\; \{</span>\frac{\mathrm{<span\; class="notranslate">\; 8</span>}\mathrm{<span\; class="notranslate">\; L</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; o</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \}</span>$

Where p = symbol error rate (symbol error rate);

R() = data rate (data rate) (bps);

O _t = additional information (seconds);

e = constant related to the target picture error rate;

C = constant.

FIG. 4 shows a flowchart 400 of a method for wireless transmission of high-definition video according to another embodiment of the present invention. Firstly, a video frame is received, and the video frame has a video frame size (for example, 0.5Mb˜3Mb) (step S402). It is particularly noted that it is possible to judge whether the received video frame has timed out according to a delay condition (for example, the next video frame must be delivered to the decoding register at the receiving end every 1/30 second), and when the video frame is timed out , remove the above video frame to transmit the next video frame (step S404). Next, measure a signal-to-noise ratio (SNR) (step S406). It must be noted that the measurement of this signal-to-noise ratio can be implemented by various methods. In one embodiment, the signal-to-noise ratio may be measured every time a video frame is received, or the signal-to-noise ratio may be measured once per unit time (for example, once per second to once every n seconds). The signal-to-noise ratio can be directly used to perform high-definition video temporary storage wireless transmission related operations, and can also be temporarily stored in a storage device for reading, and the storage device can include volatile and/or non-volatile memory. After obtaining the SNR, a modulation coding scheme (MCS) is selected from a link adaptation table according to the SNR (step S408 ). For example, when the signal-to-noise ratio is good, select a modulation coding scheme that transmits less redundant bits to increase the transmission rate, and when the signal-to-noise ratio is poor, select to transmit more redundant bits but the transmission rate is lower modulation coding scheme. The link allocation table may be a pre-defined comparison table, and after obtaining the signal-to-noise ratio, the pre-defined modulation coding scheme (MCS) may be obtained directly according to the link allocation table.

Next, obtain parameters related to the modulation coding scheme, including additional information (O _t (m)), data transmission rate R(m) and constant C related to the modulation coding scheme (step S410 ). Then obtain the symbol error rate (p) according to the modulation coding scheme (MCS) and the signal-to-noise ratio (SNR) (step S412 ). Among them, the symbol error rate (p) is the symbol error rate without channel coding (channel coding); under the convolutional code (convolutional code), the symbol error rate (p) is a first event error rate ( first event error rate). Next, in step S414, a payload length and a corresponding minimum required transmission time (MRTT) are obtained by using Newton's method with fast convergence characteristics and Equation 2. Among them, the minimum required transmission time is the time limit required to transmit the video frame, and the minimum required transmission time can meet the target frame error rate; and the payload length is the video frame that can be transmitted to the receiver within the minimum required transmission time The packet payload length of the end's decoding register. After the payload length and the corresponding minimum required transmission time are obtained, packet segmentation is performed on the video frame according to the payload length (step S416). Finally, according to the minimum required transmission time, the packets of the video frames are scheduled and output to the physical layer for transmission to the receiving end (step S418).

FIG. 5 shows a high-definition video wireless transmission device 500 according to an embodiment of the present invention. It must be noted that only the components related to the wireless transmission of high-definition video are shown here, while other components not related to the operation of wireless transmission of high-definition video are understood by those of ordinary skill in the art and will not be repeated here. Short description. The high-definition video wireless transmission device 500 includes a video stream source module 502 and a MAC control module 504 . The MAC control module 504 further includes a packetization unit 506 and a scheduler 508 .

The video source module 502 can be used to receive a video frame, for example, a high-quality video source can be read from a high-definition digital video disc, Blu-ray disc or cable TV, and sent to the media access control control module 504, wherein the video frame has A video frame size (for example, 0.5Mb˜3Mb). The media access control module 504 can be used to obtain a payload length and a minimum required transmission time related to the video frame, wherein the minimum required transmission time is a minimum time limit required to transmit the above video frame to a receiving end . The packetization unit 506 in the media access control module 504 can perform packet segmentation on the video frame according to the obtained payload length to obtain data packets of the video frame. The scheduler 508 in the MAC control module 504 can schedule the data packets of the video frame according to the minimum required transmission time, and output the packets to the physical layer for transmission to a receiving end.

FIG. 6 shows a high-definition video wireless transmission device 600 according to another embodiment of the present invention. It must be noted that only the components related to the wireless transmission of high-definition video are shown here, while other components not related to the operation of wireless transmission of high-definition video are understood by those of ordinary skill in the art and will not be repeated here. Short description. The high-definition video wireless transmission device 600 includes a video stream source module 602 , a MAC control module 604 and a transmission and measurement module 614 . The media access control module 604 also includes a video frame buffer unit 606, a transmission performance improvement unit 608, a packetization unit 610, and a scheduler )612. The transmission and measurement module 614 can be used to perform operations such as wireless transmission of high-definition video packets and measurement of signal-to-noise ratio (SNR) in the physical layer. The transmission and measurement module 614 may include an antenna, a wireless analog baseband unit, an analog-to-digital converter, a modulator, a demodulator, an encoder, a decoder, and other related components for performing wireless transmission. The transmission and measurement module 614 can be used to measure a signal-to-noise ratio (SNR), wherein the measurement of the SNR can be implemented by various methods. In one embodiment, the transmission and measurement module 614 can receive the control message from the MAC control module 604 and measure the signal-to-noise ratio every time a video frame is received. In another embodiment, the transmission and measurement module 614 may also measure the signal-to-noise ratio once per unit time (for example once per second to once every n seconds). The signal-to-noise ratio can be directly sent back to the media access control module 604 to perform operations related to wireless transmission of high-definition video temporary storage, and can also be temporarily stored in a storage device (not shown) for media access control control Module 604 is used for reading, and the storage device may include volatile and/or non-volatile memory.

The video source module 602 can be used to receive a video picture, for example, a high-quality video source can be read from a high-definition digital video disc, Blu-ray disc or cable TV, and sent to the media access control control module 604, wherein the video picture has a Video frame size (for example, 0.5Mb~3Mb). The video frame temporary storage unit 606 in the media access control control module 604 can first judge whether the received video frame is timeout, and when the video frame times out, remove the video frame to transmit the next video frame. The transmission performance improvement unit 608 can select a modulation coding scheme (MCS) from a link allocation table according to the signal-to-noise ratio (SNR) measured by the transmission and measurement module 614 . The link allocation table may be a pre-defined comparison table, and after obtaining the signal-to-noise ratio, the pre-defined modulation coding scheme (MCS) may be obtained directly according to the link allocation table. The transmission performance improvement unit 608 can obtain additional information (O _t (m)) and the data transmission rate R (m ), constant C, and symbol error rate (p) and other parameters, and use Newton's method (Newton's method) with fast convergence characteristics and formula 2 to obtain a payload length and a corresponding minimum required transmission time (MRTT) . Among them, the minimum required transmission time is the time limit required to transmit video images, and the minimum required transmission time can meet the target frame error rate; The packet payload length of the end's decoding register. The transmission performance improvement unit 608 can send the acquired payload length and the minimum required transmission time (MRTT) to the packetizing unit 610 and the scheduler (scheduler) 612 to provide packet segmentation in the MAC layer Packaging and scheduling. The packetization unit 610 can cut and package the video images into packets according to the payload length obtained by the transmission performance improvement unit 608 ; and the scheduler 612 can schedule according to the minimum required transmission time. The transmission and measurement module 614 can perform physical layer modulation and coding on the packet generated by the packetizing unit 610 according to the scheduling and the modulation coding scheme of the scheduler 612, and transmit it to the receiving end.

FIG. 7 shows the minimum required transmission time when the signal-to-noise ratio is different between the high-definition video wireless transmission method according to an embodiment of the present invention and the prior art. The wireless transmission method of high-definition video provided by the embodiment of the present invention uses the concept of minimum required transmission time (MRTT), and the method used in the prior art is the same as the method of limiting the packet error rate and the method of optimizing the transmission volume mentioned above. In the method of limiting the packet error rate, in order to reduce the packet error rate (for example, the packet error rate is limited to less than 10 ^-2 ), the payload length of the packet is shortened, but additional information (overhead information) is added, so it is necessary to More time for transmission, resulting in the situation that the delay condition is not met when the signal-to-noise ratio is low and the data packet is lost (MRTT becomes larger when the signal-to-noise ratio is low). If the packet error rate limiting method does not meet the delay conditions, the decoding register at the receiving end cannot be decoded immediately, resulting in video image errors. In the method of optimizing the throughput, since the data transmission rate required for the wireless transmission of the high-definition video is quite high, in order to increase the effective throughput (throughput) within the same time, the payload length of the packet is increased. Although the average transmission time of the method of optimizing the transmission volume is the shortest, due to the increase of the payload length of the packet, the packet error rate is increased, which also causes the loss of data packets that do not meet the delay conditions, and produces video image errors. The high-definition video wireless transmission method provided by the embodiment of the present invention can meet the target frame error rate (for example, 10 ⁻⁶ ) of the high-definition video. The embodiment of the present invention defines the required transmission time (RTT), the required transmission time (RTT) is a time limit required to transmit a video picture, and the required transmission time (RTT) can meet the target frame error rate ( eg 10 ^-6 ). For each video frame (video frames), adjust the payload length and modulation coding scheme of the video frame packet, so as to obtain the minimum required transmission time (MRTT), and use the obtained minimum required transmission time to perform packet segmentation and scheduling . As shown in Figure 7, the embodiment of the present invention successfully overcomes the limitations of the prior art, and can still meet the delay condition without video frame errors when the wireless conditions are poor, and transmit the packet of the video frame using the minimum required transmission time , allowing more users to watch high-definition videos within the limited bandwidth.

The above paragraphs use various levels of description. Obviously, the teachings herein can be implemented in many ways, and any specific structure or function disclosed in the examples is only a representative situation. According to the teaching herein, any person of ordinary skill in the art should understand that each aspect disclosed herein can be implemented independently or two or more aspects can be implemented in combination.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, this The scope of protection of the invention should be determined by the scope defined by the appended claims.

Claims (6)

1. A high-definition film wireless transmission method, suitable for transmitting a data packet of a video frame of a high-definition film, comprising: Receive the above video screen; Obtaining a payload length and a minimum required transmission time related to the video frame, wherein the minimum required transmission time is a minimum time limit required to transmit the video frame to a receiving end; performing packet cutting on the above-mentioned video picture according to the above-mentioned payload length to obtain the above-mentioned data packet; and Scheduling the data packets according to the minimum required transmission time, and sending them to the receiving end; Wherein the above-mentioned video frame has a video frame size, and the steps of obtaining the above-mentioned minimum required transmission time include: Adjusting the payload length and a modulation coding scheme according to the video frame size and a signal-to-noise ratio; Wherein the above-mentioned modulation coding scheme is obtained from a comparison table according to the above-mentioned signal-to-noise ratio; Wherein the above-mentioned minimum required transmission time is a shortest time limit required for transmitting a video frame, and the above-mentioned minimum required transmission time satisfies a target frame error rate; The wireless transmission method of high-definition video also includes: The above-mentioned minimum required transmission time is obtained according to the following formula, wherein D is the above-mentioned video frame size, L is the above-mentioned payload length, e is a function of the above-mentioned target frame error rate, p is a symbol error rate, C is a constant, R (m) is a transmission rate, and O _t (m) is an additional information: $\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; \{</span><span\; class="notranslate">\; \&lsqb;</span><span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; D.</span>}}{\mathrm{<span\; class="notranslate">\; 8</span>}\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; \&rsqb;</span><span\; class="notranslate">\; +</span>\frac{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; e</span>}<span\; class="notranslate">\; -</span>\sqrt{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; *</span><span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; D.</span>}}{\mathrm{<span\; class="notranslate">\; 8</span>}\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; *</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; *</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; L</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; *</span><span\; class="notranslate">\; \{</span>\frac{\mathrm{<span\; class="notranslate">\; 8</span>}\mathrm{<span\; class="notranslate">\; L</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; o</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \}</span><span\; class="notranslate">\; .</span>$ 2. The wireless transmission method of high-definition video as claimed in claim 1, wherein the symbol error rate is obtained according to the signal-to-noise ratio and the modulation coding scheme. 3. The wireless transmission method of high-definition film as claimed in claim 1, further comprising: judging whether the above-mentioned video picture is timed out according to a delay condition; and When the above-mentioned video frame times out, the above-mentioned video frame is removed. 4. A high-definition film wireless transmission device, suitable for transmitting a data packet of a video frame of a high-definition film, comprising: A video source module, used to receive the above-mentioned video picture; A media access control control module, used to obtain a payload length and a minimum required transmission time related to the above-mentioned video frame, wherein the above-mentioned minimum required transmission time is a minimum required for transmitting the above-mentioned video frame to a receiving end time limit; a packetizing unit, configured to packetize and cut the above-mentioned video picture according to the length of the above-mentioned payload to obtain the above-mentioned data packet; and a media access control scheduler, used to schedule the data packets according to the minimum required transmission time, and output to a physical layer for transmission to the receiving end; Wherein the video frame has a video frame size, and obtaining the minimum required transmission time by the media access control module includes adjusting the payload length and a modulation coding scheme according to the video frame size and a signal-to-noise ratio; Wherein, the above-mentioned media access control control module obtains the above-mentioned modulation coding scheme from a comparison table according to the above-mentioned signal-to-noise ratio; Wherein the above-mentioned minimum required transmission time is a shortest time limit required for transmitting a video frame, and the above-mentioned minimum required transmission time satisfies a target frame error rate; Wherein the above-mentioned media access control control module also obtains the above-mentioned minimum required transmission time according to the following formula, wherein D is the above-mentioned video frame size, L is the above-mentioned payload length, e is a function of the above-mentioned target frame error rate, and p is a symbol Error rate, C is a constant, R(m) is a transmission rate, and _Ot (m) is an additional information: $\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; \{</span><span\; class="notranslate">\; \&lsqb;</span><span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; D.</span>}}{\mathrm{<span\; class="notranslate">\; 8</span>}\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; \&rsqb;</span><span\; class="notranslate">\; +</span>\frac{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; e</span>}<span\; class="notranslate">\; -</span>\sqrt{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; *</span><span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; D.</span>}}{\mathrm{<span\; class="notranslate">\; 8</span>}\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; *</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; *</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; L</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; *</span><span\; class="notranslate">\; \{</span>\frac{\mathrm{<span\; class="notranslate">\; 8</span>}\mathrm{<span\; class="notranslate">\; L</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; o</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \}</span><span\; class="notranslate">\; .</span>$ 5. The wireless high-definition video transmission device as claimed in claim 4, wherein the symbol error rate is obtained according to the signal-to-noise ratio and the modulation coding scheme. 6. The high-definition film wireless transmission device as claimed in claim 4, further comprising: A video frame temporary storage unit is used for judging whether the video frame is timed out according to a delay condition, and when the video frame is timed out, removes the video frame.