CN104219539B - A method of the Video coding based on TD-LTE Channel Detections and transmission - Google Patents
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Abstract
The invention discloses a kind of methods of the Video coding based on TD-LTE Channel Detections and transmission, adaptive video coding and transmission technology based on Channel Detection are used for TD-LTE system video traffic by it, and adaptive adjustment that video code rate changes with channel conditions is realized by increasing the real-time detection module of TD-LTE channels and Video coding coefficient estimation module in video source；The parameters such as channel capacity, channel bit error rate and the received signal strength of TD-LTE system are obtained by real-time detection module in video source to determine the Video codings coefficients such as resolution ratio, quantization parameter QP and frame per second, realize the adaptive adjustment of the video frequency coding rate based on Channel Detection；It is an advantage of the invention that enabling video source adaptively to adjust coding parameter and stream rate to meet the video data transmission requirement under the conditions of dynamic channel change, and the real-time and continuity that can ensure transmission of video avoid the problems such as bit error rate occurred when there is video data transmission is high, delay is big and channel utilization is low.
Description
Technical field
The present invention relates to a kind of methods of the Video coding based on TD-LTE Channel Detections and transmission, belong to wireless communication skill
Art field.
Background technology
Currently, TD-LTE, that is, Time Division Long Term Evolution (timesharing long term evolution), are by A Er
Companies' joint developments such as Ka Te-Lucent, Nokia Siemens Networks communication, Datang Telecom, Huawei Technologies, ZTE Corporation, China Mobile
Forth generation (4G) mobile communication technology and standard.Theoretical highest downlink rate and upstream rate can respectively reach 100Mbits/s
And 50Mbits/s, meet the requirement of high speed data transfer.TD-LTE system can not only provide the functions such as voice, short data, also
High-quality video business can be provided, especially real-time transmission of video can provide more intuitive and abundant ditch entire body to the user
It tests.
As shown in Figure 1, in current TD-LTE system in the prior art, video traffic by video source, base station,
TD-LTE networks, video terminal are completed jointly.Video source is after receiving the application instruction that video on demand or video upload, first
Negotiate to establish video transmission channel with base station, then carries out Video coding according to default or agreement preset parameter coding, and will
Video flowing is sent to base station equipment by wireless channel, and video flowing is finally transmitted to video end by TD-LTE networks and base station
End, in order to decode, store and play.Therefore, following Fig. 2 of data handling procedure of the middle video source in prior art systems
It is shown.
Although the theoretical downstream rate and upstream rate of TD-LTE system can reach 100Mbits/s and 50Mbits/s,
It is that the transmission bandwidth that can be assigned to each terminal of increase of number of users is limited.At the same time, wireless transmission channel by
It is influenced to factors such as time-varying, decaying, noise jamming, Doppler frequency shifts, channel conditions can be caused to deteriorate the decline with transmission bandwidth,
Since in the video traffic of TD-LTE system in the prior art, the encoder of video source is always according to default or agreement
Preset parameter is encoded, and coded data is sent to transmission channel with more stable rate, if gone out in transmission process
When existing channel degradation or bandwidth decline, it is susceptible to the problems such as delay is big, the bit error rate is high, transmission efficiency is low, coded data is just difficult
With in time, be accurately and completely transmitted to terminal, not only influence video quality and viewing effect, nothing possibly even caused when serious
Method restores and playing video data.
Invention content
The purpose of the present invention is to provide a kind of regarding based on TD-LTE Channel Detections that can overcome above-mentioned technical problem
Frequency encodes the method with transmission.It is transmitted with present in transmission technology for Video coding in TD-LTE system in the prior art
The problems such as delay is big, the bit error rate is high, channel transport efficiency is low, the present invention increases TD-LTE channel detection modules in video source
The ginsengs such as channel capacity, transmission error rates and received signal strength are obtained with code coefficient estimation module and by real-time detection module
Number to adjust in real time the resolution ratio of Video coding, image quantization coefficient (i.e. Quantization Parameter, hereinafter referred to as
QP), frame per second coefficient.The present invention can be good in TD-LTE channel conditions according to channel conditions adaptive regulating video data bit rate
When transmit better quality video data, and when channel conditions difference transmit lower quality video data, to realize video data
Effective transmission and TD-LTE channels efficient utilization, further improve the video-see effect of user terminal.
The central principle of the method for the present invention is to be used for the adaptive video coding based on Channel Detection with transmission technology
TD-LTE system video traffic, by increasing the real-time detection module of TD-LTE channels and the estimation of Video coding coefficient in video source
Module realizes adaptive adjustment that video code rate changes with channel conditions；It is obtained by real-time detection module in video source
The parameters such as channel capacity, channel bit error rate and the received signal strength of TD-LTE system come determine resolution ratio, quantization parameter QP and
The Video codings coefficient such as frame per second realizes the adaptive adjustment of the video frequency coding rate based on Channel Detection；At the same time, video
Resolution ratio, frame per second and quantization parameter QP adjust automaticallies decoder parameters that the player of terminal is carried according to video flowing are simultaneously solved
Code.
The present invention includes step in detail below：
(1) video source detects and estimates channel width, signal strength and channel according to TD-LTE channel state informations
Three parameters of the bit error rate；
(2) video source determines the resolution ratio of Video coding according to channel width first, then according to signal strength and letter
The road bit error rate adjusts the frame per second and quantization parameter QP of Video coding in real time；
A) encoder of video source determines the class of code distinguishability according to channel width, when channel width is larger,
Select the higher 1080P and 720P of resolution ratio (pixel is respectively 1920x1080 and 1280x720)；When channel width is smaller,
Select the lower D1 and CIF of resolution ratio (pixel is respectively 720x576 and 352x288)；
B) real-time further according to channel bit error rate and signal strength after the encoder of video source determines video resolution
QP is adjusted, QP value variation ranges are 20~45；When channel bit error rate is higher or reception signal is weaker, coding QP values are reduced；When
When channel bit error rate is relatively low or reception signal is stronger, coding QP values are improved；
C) encoder of video source adjusts frame per second in real time according to channel bit error rate and signal strength, and frame per second ranging from 1~
25 frames/second；When channel bit error rate is higher or signal is weaker, frame per second is reduced；When channel bit error rate is relatively low or signal is stronger, carry
High frame per second；
(3) tri- encoder of video source obtains according to estimates resolution ratio, frame per second and quantization parameter QP coefficients, startup regard
Frequently
Coding, and it is performed simultaneously step (1) and step (2).
(4) resolution ratio, frame per second and the quantization parameter QP adjust automatically solutions that the player of video terminal is carried according to video flowing
Code device parameter, and be decoded and play.
Such as：Video source determines the class of code distinguishability according to channel width first；When channel width is larger, choosing
Select resolution ratio higher 1080P and 720P (pixel is respectively 1920x1080 and 1280x720)；When channel width is smaller, choosing
Select resolution ratio lower D1 and CIF (pixel is respectively 720x576 and 352x288)；Video source is determining video resolution
Afterwards, further according to channel bit error rate and the real-time adjust quantization coefficient QP of signal strength or coding frame per second, the variation of QP and coding frame per second
Range is respectively 20~45 and 1~25 frame/second；When channel bit error rate is higher or reception signal is weaker, QP or frame per second are reduced；When
When channel bit error rate is relatively low or reception signal is stronger, QP or frame per second are improved.
It is an advantage of the invention that：Application in the video traffic of TD-LTE system through the invention enables video source
Enough adaptive adjustment coding parameters and stream rate are required with meeting the video data transmission under the conditions of dynamic channel change, and
The real-time and continuity that can ensure transmission of video avoid the bit error rate height occurred when there is video data transmission, delay
The problems such as big and channel utilization is low.Better quality video data is transmitted when TD-LTE channel conditions are good, and works as channel conditions
The video data that lower quality is transmitted when poor, to realize effective efficient profit transmitted with TD-LTE channels of video data
With improving the overall performance of system and the quality of video traffic.
Description of the drawings
Fig. 1 is the video traffic schematic diagram in TD-LTE system in the prior art：
Fig. 2 is the data process diagram of video source in TD-LTE system in the prior art；
Fig. 3 is the operation principle block diagram of the present invention；
Fig. 4 is the transmission of video and result of broadcast of prior art systems；
Fig. 5 is the transmission of video and result of broadcast of the present invention.
Specific implementation mode
The present invention will be described in detail with reference to the accompanying drawings and examples.As shown in Figure 1, the present invention includes：
The operation principle of the present invention is as shown in Figure 3：TD-LTE system in the prior art is as shown in Fig. 2, compared to existing
TD-LTE system in the prior art, the present invention increases the real-time detection module of channel and video coding parameter in video source
Estimation module obtains channel capacity, channel bit error rate and the received signal strength etc. of TD-LTE system by real-time detection module
Parameter estimates the Video codings coefficients such as resolution ratio, quantization parameter QP, frame per second, and then realizes that video code rate becomes according to channel conditions
The adaptive adjustment changed.
Compare TD-LTE system video traffic in the prior art and the present invention under channel capacity situation of change below
Transmission of video effect, it is assumed that channel capacity C is in the time 0<0.3Mpbs is dropped to by 7Mpbs in the time of T≤300 second.Such as Fig. 4 institutes
Show：For the TD-LTE system in the prior art encoded using constant code rate (CBR) and pre-arranged code parameter, if default
Resolution ratio is 720P, code check R=1Mbps.When video code rate is less than channel capacity, i.e. R≤C, video data can in real time just
It really is transferred to terminal, and is decoded and plays；With the decline of channel capacity, when video code rate is more than channel capacity, i.e. R
>=C, video data cannot real-time and accurately be transferred to terminal, to decode and correctly play.Therefore, in the prior art
The TD-LTE system total amount of data that can carry out effectively transmitting and accurate decoding plays be：
S=RT=1Mbps × 100s=100Mbit
The present invention adjusts coding parameter in real time according to coefficients such as channel capacities, and coding generates non-constant code check (VBR), can
It is always ensured that the continuity of transmission of video and terminal plays.As shown in Figure 5：Work as C>5Mbps, code distinguishability coefficient are selected
1080P, code check R are about 5Mbps, can make full use of channel capacity transmission HD video；As channel capacity 5Mbps >=C>
1Mbps, code distinguishability automatically switch to 720P, and code check R is about 1Mbps, and the video data of 720P formats can be accurate in real time
It is transferred to terminal and plays out；As channel capacity 1Mbps >=C>When 0.3Mbps, code distinguishability is switched to D1, and code check R is about
For 0.3Mbps, video terminal remains to real-time reception to D1 videos and plays out；When channel capacity C≤0.3Mbps, coding point
Resolution is switched to CIF, still can transmit and play low-resolution video.Thus the present invention can carry out effectively transmission and it is accurate
Decoding the total amount of data played is：
S '=5Mpbs × 20s+1Mpbs × 80s+0.3Mps × 200s=240Mbit
Compare S and S ', S '/S=2.4 times, it can be seen that the present invention compared with the prior art in TD-LTE system can
The video data transmission performance of TD-LTE system is effectively improved, can ensure having for transmission of video under dynamics of channels change condition
Effect property and the quality for improving video playing.
In an embodiment of the present invention, video source of the invention is by video encoding module and TD-LTE channel detection modules
Composition.TD-LTE channel detection modules are responsible for detecting channel conditions according to TD-LTE terminal feedback informations and obtain channel strip
Wide, signal strength and channel bit error rate；Video encoding module is supported H.264 or the Video coding of SVAC formats, SVAC videos are compiled
Code supports the real-time adjustment of video resolution, frame per second and image quantization coefficient.Video point can be determined according to channel width first
The correspondence of resolution, channel width and code coefficient is as shown in table 1 below, then dynamic further according to signal strength and channel bit error rate
State adjusts frame per second and QP.
The mapping table of channel width and Video coding coefficient in 1 embodiment of table
In this embodiment of the invention, the detailed processing of Video coding and transmission method based on TD-LTE Channel Detections
Process is：
1), video source initiates link after receiving the instruction that video on demand or video upload to the place base stations TD-LTE
Request is established, is succeeded receiving the base stations TD-LTE and replying and establish link；
2), video source detects and estimates channel width, signal strength and channel according to TD-LTE channel state informations
Three parameters of the bit error rate；
3), video source determines the resolution ratio of Video coding according to channel width；As channel capacity C>5Mbps, resolution ratio
Select 1080P (pixel 1920x1080)；As 5Mbps >=C>1Mbps, code distinguishability are 720P (pixel 1280x720)；
As 1Mbps >=C>0.3Mbps, code distinguishability are D1 (pixel 720x576)；As C≤0.3Mbps, code distinguishability CIF
(pixel 352x288)；
4), video source is adjusted the frame per second of Video coding according to signal strength and channel bit error rate in real time by class；This hair
Frame per second class is arranged in bright embodiment 5 grades：5fps,10fps,15fps,20fps,25fps；When signal strength is less than -43dBm
Or channel bit error rate is higher than 5%, can reduce frame per second class；Conversely, when signal strength is low more than -43dBm channels or the bit error rate
In 5%, frame per second class can be increased；
5), video source is adjusted the quantization parameter QP of Video coding according to signal strength and channel bit error rate in real time by class
Value；QP class is arranged in the embodiment of the present invention 5 grades：20,25,30,40 and 50；When signal strength is less than -43dBm or channel mistake
Code check is higher than 5%, can improve QP value class；Conversely, when signal strength is less than 5% more than -43dBm or channel bit error rate, it can
To reduce QP value class；
6), video source starts Video coding after establishing link success and determining coding parameter, and by detecting signal
Intensity and channel bit error rate, it is adaptive to adjust frame per second and quantization parameter QP values；
7), the data flow that coding generates is transmitted to TD-LTE transmission modules by video source, is sent by TD-LTE transmission modules
To base station, video terminal is then transmitted to by the base stations TD-LTE；
8) resolution ratio, frame per second and the quantization parameter QP that, video terminal is carried according to video data stream are decoded, and are then deposited
Storage or playing video data.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
In range disclosed by the invention, the change or replacement that can be readily occurred in should all be contained those familiar with the art
Lid is within the scope of the invention as claimed.
Claims (1)
1. a kind of method of Video coding and transmission based on TD-LTE Channel Detections, which is characterized in that Channel Detection will be based on
Adaptive video coding and transmission technology be used for TD-LTE system video traffic, by increasing TD-LTE channels in video source
Real-time detection module and Video coding coefficient estimation module realize adaptive adjustment that video code rate changes with channel conditions；
Channel capacity, channel bit error rate and the received signal strength ginseng of TD-LTE system are obtained by real-time detection module in video source
It counts to determine resolution ratio, quantization parameter QP and frame-rate video code coefficient, realizes the video frequency coding rate based on Channel Detection
Adaptive adjustment；At the same time, resolution ratio, frame per second and the quantization parameter QP that the player of video terminal is carried according to video flowing
Adjust automatically decoder parameters are simultaneously decoded；Video source is set adaptively to adjust coding parameter and stream rate to meet
Video data transmission requirement under the conditions of dynamic channel change, including step in detail below：
(1) video source detects and estimates channel width, signal strength and channel error code according to TD-LTE channel state informations
Three parameters of rate；
(2) video source determines the resolution ratio of Video coding according to channel width first, is then missed according to signal strength and channel
Code check adjusts the frame per second and quantization parameter QP of Video coding in real time；
A) encoder of video source determines the class of code distinguishability according to channel width, when channel width is larger, selection
Resolution ratio higher 1080P and 720P；When channel width is smaller, the lower D1 and CIF of resolution ratio is selected；
B) it after the encoder of video source determines video resolution, is adjusted in real time further according to channel bit error rate and signal strength
QP, QP value variation range are 20~45；When channel bit error rate is higher or reception signal is weaker, coding QP values are reduced；Work as channel
When the bit error rate is relatively low or reception signal is stronger, coding QP values are improved；
C) encoder of video source adjusts frame per second in real time according to channel bit error rate and signal strength, and frame per second ranging from 1~25 frame/
Second；When channel bit error rate is higher or signal is weaker, frame per second is reduced；When channel bit error rate is relatively low or signal is stronger, frame is improved
Rate；
(3) encoder of video source according to estimation obtain resolution ratio, tri- coefficients of frame per second and quantization parameter QP, start video
Coding, and it is performed simultaneously step (1) and step (2)；
(4) resolution ratio, frame per second and the quantization parameter QP adjust automatically decoders that the player of video terminal is carried according to video flowing
Parameter, and be decoded and play.
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| CN108028946A (en) * | 2015-09-15 | 2018-05-11 | 华为技术有限公司 | Method of adjustment, system and the relevant device of media auto-adaptive parameter |
| CN105472304A (en) * | 2015-11-24 | 2016-04-06 | 广东电网有限责任公司电力调度控制中心 | Power grid emergency communication video coding and decoding dynamic adaptation method and system thereof |
| CN107404742A (en) * | 2016-05-18 | 2017-11-28 | 阿基米德（上海）传媒有限公司 | A kind of method that audio quality is dynamically adjusted under mobile network |
| CN106330907A (en) * | 2016-08-24 | 2017-01-11 | 阿基米德（上海）传媒有限公司 | Mobile-end audio high/low-data-rate adaptive play method |
| US20190190652A1 (en) * | 2016-08-26 | 2019-06-20 | Huawei Technologies Co., Ltd. | Encoding Rate Adjustment Method and Terminal |
| CN108449564B (en) * | 2017-02-16 | 2020-03-06 | 视联动力信息技术股份有限公司 | Method and system for supporting video decoding chip to adapt to video source resolution |
| WO2019100204A1 (en) * | 2017-11-21 | 2019-05-31 | 深圳市大疆创新科技有限公司 | Video processing method, device, aerial vehicle, system, and storage medium |
| CN109600579A (en) * | 2018-10-29 | 2019-04-09 | 歌尔股份有限公司 | Video wireless transmission method, apparatus, system and equipment |
| CN109756328B (en) * | 2018-12-11 | 2020-09-25 | 北京捷安通科技有限公司 | Key generation method based on self-adaptive adjustment of error rate parameters and client |
| CN109788316B (en) * | 2019-02-27 | 2020-08-14 | 腾讯科技（深圳）有限公司 | Code rate control method and device, video transcoding method and device, computer equipment and storage medium |
| CN110113641B (en) * | 2019-04-17 | 2022-02-25 | 腾讯科技（深圳）有限公司 | Video data transmission method, device, edge service node and medium |
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