CN104219539A - Video encoding and transmitting method based on TD-LTE (time division long term evolution) channel detection - Google Patents
Video encoding and transmitting method based on TD-LTE (time division long term evolution) channel detection Download PDFInfo
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Abstract
The invention discloses a video encoding and transmitting method based on TD-LTE (time division long term evolution) channel detection. Adaptive video encoding and transmitting technology based on channel detection is used for TD-LTE system video services, a video rate is adaptively adjusted along with the change of channel conditions by adding a TD-LTE channel real-time detection module and a video encoding coefficient estimation module at a video source end, the real-time detection module obtains parameters of a TD-LTE system such as channel capacity, channel error rate and received signal strength at the video source end, so that video encoding coefficients such as resolution, a quantization coefficient QP and frame rate are determined, and the video encoding rate is adaptively adjusted based on channel detection. The video encoding and transmitting method has the advantages that the video source end can adaptively adjust encoding parameters and code stream rate to meet video data transmitting requirements under the condition of dynamically changing channels, video transmitting real-time performance and video transmitting continuity can be ensured, and the method solves the problems of high error rate, long delay, low channel use rate and the like when the video data are transmitted.
Description
Technical field
The present invention relates to a kind of Video coding based on TD-LTE Channel Detection and the method for transmission, belong to wireless communication technology field.
Background technology
At present, TD-LTE is Time Division Long Term Evolution (timesharing Long Term Evolution), be by company's joint developments such as Alcatel-Lucent, Nokia Siemens Networks communication, Datang Telecom, Huawei Technologies, ZTE Corporation, China Mobile the 4th generation (4G) mobile communication technology and standard.The highest downstream rate of theory and upstream rate can reach respectively 100Mbits/s and 50Mbits/s, meet the requirement of high speed data transfer.TD-LTE system not only can provide the function such as voice, short data, and high-quality video business can also be provided, and especially real-time transmission of video can be experienced for user provides more directly perceived and abundant communication.
As shown in Figure 1, in current TD-LTE system of the prior art, video traffic is completed jointly by video source, base station, TD-LTE network, video terminal.Video source is being received after the application instruction that video request program or video are uploaded, first set up video transmission channel with base station negotiate, then carry out Video coding according to the preset parameter coding of default or agreement, and video flowing is sent to base station equipment by wireless channel, finally by TD-LTE network and base station, video flowing is transmitted to video terminal, so that decoding, storage and broadcasting.Therefore, the data handling procedure of the middle video source in prior art systems is illustrated in fig. 2 shown below.
Although the theoretical downstream rate of TD-LTE system and upstream rate can reach 100Mbits/s and 50Mbits/s, along with the transmission bandwidth that the each terminal of increase of number of users can be assigned to is limited.Meanwhile, wireless transmission channel is then become, decay, noise jamming, the factor impacts such as Doppler frequency shift, can cause the decline of channel conditions deteriorate and transmission bandwidth, in video traffic due to TD-LTE system in the prior art, the encoder of video source is encoded according to preset parameter default or agreement all the time, and coded data is sent to transmission channel with more stable speed, if while occurring in transmitting procedure that channel degradation or bandwidth decline, easily occur postponing large, the error rate is high, the problems such as efficiency of transmission is low, coded data is just difficult in time, accurately and intactly transfer to terminal, not only affect video quality and viewing effect, when serious, even may cause cannot recovering and playing video data.
Summary of the invention
The object of the present invention is to provide and a kind ofly can overcome the Video coding based on TD-LTE Channel Detection of above-mentioned technical problem and the method for transmission.The problem such as large for the transmission delay existing in Video coding and transmission technology in TD-LTE system of the prior art, the error rate is high, channel transport efficiency is low, the present invention has increased TD-LTE Channel Detection module and code coefficient estimation module and has obtained the parameters such as channel capacity, transmission error rates and received signal strength by real-time detection module resolution, image quantization coefficient (being Quantization Parameter, hereinafter to be referred as QP), the frame per second coefficient of adjusting in real time Video coding in video source.The present invention can be according to channel conditions adaptive regulating video data bit rate, in the time that TD-LTE channel conditions is good, transmit better quality video data, and transmit compared with low quality video data in the time that channel conditions is poor, thereby realize effective transmission of video data and the efficient utilization of TD-LTE channel, further improve the video-see effect of user terminal.
The central principle of method of the present invention is for TD-LTE system video business, by increasing the real-time detection module of TD-LTE channel in video source and Video coding coefficient estimation module realizes the self adaptation adjustment that video code rate changes along with channel conditions by the adaptive video coding based on Channel Detection and transmission technology; The parameter such as channel capacity, channel bit error rate and received signal strength that obtains TD-LTE system in video source by real-time detection module is determined the Video coding coefficients such as resolution, quantization parameter QP and frame per second, has realized the self adaptation adjustment of the video frequency coding rate based on Channel Detection; Meanwhile, the player of video terminal carries according to video flowing resolution, frame per second and quantization parameter QP automatically adjust decoder parameters and decode.
The present invention includes following concrete steps:
(1) video source, according to TD-LTE channel condition information, detects and estimates channel width, signal strength signal intensity and three parameters of channel bit error rate;
(2) first video source determines the resolution of Video coding according to channel width, then adjusts in real time frame per second and the quantization parameter QP of Video coding according to signal strength signal intensity and channel bit error rate;
A) encoder of video source is determined the class of code distinguishability according to channel width, in the time that channel width is larger, selects higher 1080P and the 720P (pixel is respectively 1920x1080 and 1280x720) of resolution; When channel width hour, select lower D1 and the CIF (pixel is respectively 720x576 and 352x288) of resolution;
B) determined after video resolution at the encoder of video source, then adjusted in real time QP according to channel bit error rate and signal strength signal intensity, QP value excursion is 20～45; In the time that channel bit error rate is higher or reception signal is weak, reduce coding QP value; In the time that channel bit error rate is lower or reception signal is stronger, improve coding QP value;
C) encoder of video source is adjusted frame per second in real time according to channel bit error rate and signal strength signal intensity, and frame per second scope was 1～25 frame/second; In the time that channel bit error rate is higher or signal is weak, reduce frame per second; In the time that channel bit error rate is lower or signal is stronger, improve frame per second;
(3) encoder of video source obtains according to estimates resolution, frame per second and tri-coefficients of quantization parameter QP, start video
Coding, and perform step (1) and step (2) simultaneously.
(4) player of video terminal carries according to video flowing resolution, frame per second and quantization parameter QP adjust decoder parameters automatically, and decode and play.
For example: first video source determines the class of code distinguishability according to channel width; In the time that channel width is larger, select higher 1080P and the 720P (pixel is respectively 1920x1080 and 1280x720) of resolution; When channel width hour, select lower D1 and the CIF (pixel is respectively 720x576 and 352x288) of resolution; Video source determining after video resolution, then adjusts in real time quantization parameter QP or coding frame per second according to channel bit error rate and signal strength signal intensity, and the excursion of QP and coding frame per second was respectively for 20～45 and 1～25 frame/second; In the time that channel bit error rate is higher or reception signal is weak, reduce QP or frame per second; In the time that channel bit error rate is lower or reception signal is stronger, improve QP or frame per second.
Advantage of the present invention is: the application by the present invention in the video traffic of TD-LTE system, make video source can self adaptation adjust coding parameter and stream rate to meet the video data transmitting requirement under dynamic change channel condition, and can ensure real-time and the continuity of transmission of video, avoided the error rate that occurs while there is video data transmitting high, postpone the problems such as large and channel utilization is low.In the time that TD-LTE channel conditions is good, transmit better quality video data, and in the time that channel conditions is poor transmission low-qualityer video data, thereby realize effective transmission of video data and the efficient utilization of TD-LTE channel, improved the quality of overall performance and the video traffic of system.
Brief description of the drawings
Fig. 1 is the video traffic schematic diagram in TD-LTE system of the prior art:
Fig. 2 is the data processing block diagram of video source in TD-LTE system of the prior art;
Fig. 3 is operation principle block diagram of the present invention;
Fig. 4 is transmission of video and the result of broadcast of prior art systems;
Fig. 5 is transmission of video of the present invention and result of broadcast.
Embodiment
Describe the present invention below in conjunction with drawings and Examples.As shown in Figure 1, the present invention includes:
Operation principle of the present invention is as shown in Figure 3: TD-LTE system of the prior art as shown in Figure 2, than existing TD-LTE system of the prior art, the present invention has increased the real-time detection module of channel and video coding parameter estimation module in video source, the parameter such as channel capacity, channel bit error rate and received signal strength that obtains TD-LTE system by real-time detection module is estimated the Video coding coefficients such as resolution, quantization parameter QP, frame per second, and then realizes the self adaptation adjustment that video code rate changes according to channel conditions.
Compare TD-LTE system video business of the prior art and transmission of video effect of the present invention under channel capacity situation of change below, suppose that channel capacity C drops to 0.3Mpbs by 7Mpbs within second time of time 0<T≤300.As shown in Figure 4: for the TD-LTE system of the prior art that adopts constant code rate (CBR) and default coding parameter to encode, establishing default resolution is 720P, and code check is R=1Mbps.When video code rate is less than channel capacity, i.e. R≤C, video data can correctly be transferred to terminal in real time, and decodes and play; Along with the decline of channel capacity, when video code rate is greater than channel capacity, i.e. R >=C, video data just can not be transferred to terminal real-time and accurately, thereby cannot decode and correctly play.Therefore the total amount of data that, TD-LTE system of the prior art can carry out effectively transmitting and accurately decoding is play is:
S＝RT＝1Mbps×100s＝100Mbit
The present invention adjusts coding parameter in real time according to coefficients such as channel capacities, and coding produces non-constant code check (VBR), can ensure all the time the continuity of transmission of video and terminal plays.As shown in Figure 5: work as C>5Mbps, code distinguishability coefficient is selected 1080P, and code check R is about 5Mbps, can make full use of channel capacity transmission HD video; As channel capacity 5Mbps >=C>1Mbps, code distinguishability automatically switches to 720P, and code check R is about 1Mbps, and the video data of 720P form can accurately be transferred in real time terminal and play; In the time of channel capacity 1Mbps >=C>0.3Mbps, code distinguishability switches to D1, and code check R is about 0.3Mbps, and video terminal still can receive in real time D1 video and play; As channel capacity C≤0.3Mbps, code distinguishability switches to CIF, still can transmit and play low-resolution video.Thereby the present invention can carry out effectively transmission and the total amount of data of playing of accurately decoding is:
S′＝5Mpbs×20s+1Mpbs×80s+0.3Mps×200s＝240Mbit
Relatively S and S ', S '/S=2.4 doubly, the present invention can effectively improve the video data transmitting performance of TD-LTE system than TD-LTE system of the prior art as can be seen here, can under dynamics of channels change condition, ensure the validity and the quality of improving video playback of transmission of video.
In an embodiment of the present invention, video source of the present invention is made up of video encoding module and TD-LTE Channel Detection module.TD-LTE Channel Detection module is responsible for detecting channel conditions and obtaining channel width, signal strength signal intensity and channel bit error rate according to TD-LTE terminal feedback information; Or the Video coding of SVAC form H.264, SVAC Video coding is supported the real-time adjustment of video resolution, frame per second and image quantization coefficient in video encoding module support.First can determine video resolution according to channel width, the corresponding relation of channel width and code coefficient is as shown in table 1 below, and then dynamically adjusts frame per second and QP according to signal strength signal intensity and channel bit error rate.
The mapping table of channel width and Video coding coefficient in table 1 embodiment
In this embodiment of the present invention, the detailed processing procedure of the Video coding based on TD-LTE Channel Detection and transmission method is:
1), video source receiving after the instruction that video request program or video are uploaded, and initiates request for building link to TD-LTE base station, place, receiving that TD-LTE base station replys and set up link successfully;
2), video source is according to TD-LTE channel condition information, detects and estimate channel width, signal strength signal intensity and three parameters of channel bit error rate;
3), video source is determined the resolution of Video coding according to channel width; As channel capacity C>5Mbps, resolution is selected 1080P (pixel is 1920x1080); As 5Mbps >=C>1Mbps, code distinguishability is 720P (pixel is 1280x720); As 1Mbps >=C>0.3Mbps, code distinguishability is D1 (pixel is 720x576); As C≤0.3Mbps, code distinguishability is CIF (pixel is 352x288);
4), video source is adjusted the frame per second of Video coding in real time by class according to signal strength signal intensity and channel bit error rate; Frame per second class is set in the embodiment of the present invention and has 5 grades: 5fps, 10fps, 15fps, 20fps, 25fps; When be less than-43dBm of signal strength signal intensity or channel bit error rate are higher than 5%, can reduce frame per second class; Otherwise, when signal strength signal intensity be greater than-43dBm channel or the error rate are lower than 5%, can increase frame per second class;
5), video source is adjusted the quantization parameter QP value of Video coding in real time by class according to signal strength signal intensity and channel bit error rate; QP class is set in the embodiment of the present invention and has 5 grades: 20,25,30,40 and 50; When be less than-43dBm of signal strength signal intensity or channel bit error rate are higher than 5%, can improve QP value class; Otherwise, when be greater than-43dBm of signal strength signal intensity or channel bit error rate are lower than 5%, can reduce QP value class;
6), video source starts Video coding setting up after link success and definite coding parameter, and by detection signal strength and channel bit error rate, self adaptation is adjusted frame per second and quantization parameter QP value;
7), video source by coding produce data flow pass to TD-LTE transport module, send to base station by TD-LTE transport module, be then transmitted to video terminal by TD-LTE base station;
8), the video terminal resolution, frame per second and the quantization parameter QP that carry according to video data stream decode, then storage or playing video data.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in scope disclosed by the invention; the variation that can expect easily or replacement, all should be encompassed in the protection range of the claims in the present invention.
Claims (2)
1. a Video coding based on TD-LTE Channel Detection and the method for transmission, it is characterized in that, adaptive video coding based on Channel Detection and transmission technology are used for to TD-LTE system video business, realize the self adaptation adjustment of video code rate along with channel conditions variation by increase the real-time detection module of TD-LTE channel and Video coding coefficient estimation module in video source; The parameter such as channel capacity, channel bit error rate and received signal strength that obtains TD-LTE system in video source by real-time detection module is determined the Video coding coefficients such as resolution, quantization parameter QP and frame per second, has realized the self adaptation adjustment of the video frequency coding rate based on Channel Detection; Meanwhile, the player of video terminal carries according to video flowing resolution, frame per second and quantization parameter QP automatically adjust decoder parameters and decode.
2. a kind of Video coding based on TD-LTE Channel Detection according to claim 1 and the method for transmission, is characterized in that, comprises following concrete steps:
(1) video source, according to TD-LTE channel condition information, detects and estimates channel width, signal strength signal intensity and three parameters of channel bit error rate;
(2) first video source determines the resolution of Video coding according to channel width, then adjusts in real time frame per second and the quantization parameter QP of Video coding according to signal strength signal intensity and channel bit error rate;
A) encoder of video source is determined the class of code distinguishability according to channel width, in the time that channel width is larger, selects higher 1080P and the 720P of resolution; When channel width hour, select lower D1 and the CIF of resolution;
B) determined after video resolution at the encoder of video source, then adjusted in real time QP according to channel bit error rate and signal strength signal intensity, QP value excursion is 20～45; In the time that channel bit error rate is higher or reception signal is weak, reduce coding QP value; In the time that channel bit error rate is lower or reception signal is stronger, improve coding QP value;
C) encoder of video source is adjusted frame per second in real time according to channel bit error rate and signal strength signal intensity, and frame per second scope was 1～25 frame/second; In the time that channel bit error rate is higher or signal is weak, reduce frame per second; In the time that channel bit error rate is lower or signal is stronger, improve frame per second;
(3) encoder of video source obtains according to estimates resolution, frame per second and tri-coefficients of quantization parameter QP, start Video coding, and perform step (1) and step (2) simultaneously;
(4) player of video terminal carries according to video flowing resolution, frame per second and quantization parameter QP adjust decoder parameters automatically, and decode and play.
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