Video wireless transmission control method suitable for CDMA2000

A wireless transmission and control method technology, which is applied in the direction of pulse modulation TV signal transmission, wireless communication, transmission system, etc., to achieve the effect of realizing congestion control and overcoming high bit errors

Inactive Publication Date: 2012-06-20
ZHEJIANG UNIV OF TECH +1
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Problems solved by technology

[0008] In order to overcome the deficiency that the existing video wireless transmission control method cannot be applied to the unstable wireless channel with low bandwidth, high bit error and high delay to transmit real-time video, the present invention provides a method that can be effectively applied to low bandwidth, high bit error, high Video wireless transmission control method suitable for CDMA2000 for transmitting real-time video in delayed unstable wireless channel

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  • Video wireless transmission control method suitable for CDMA2000
  • Video wireless transmission control method suitable for CDMA2000
  • Video wireless transmission control method suitable for CDMA2000

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings.

[0032] refer to figure 1 and figure 2 , a kind of video wireless transmission control method applicable to CDMA2000, described video wireless transmission control method comprises the following steps:

[0033] 1) Adopt CDMA2000 EVDO as the wireless access method;

[0034] 2) Re-encapsulate the H.264 video stream based on the real-time transport protocol RTP. When there is H.264 data to be sent, obtain the data of a network abstraction layer NAL unit; if the length of the network abstraction layer NAL unit is less than the maximum transmission of RTP Unit MTU, then send it in a package; otherwise, it needs to be sent in packets, and when sending packets, judge whether it is the first packet of FU-A. A packet, if it is, add the end header of FU-A and send it, otherwise add the header of the middle packet of FU-A and send it; judge whether the subpackage is completed,...

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Abstract

The invention relates to a video wireless transmission control method suitable for CDMA2000, which comprises the following steps: (1) taking CDMA2000EVDO as a wireless access mode; (2) packaging H.264 video streams again based on the real-time transport protocol (RTP); (3) introducing an RTCP feedback mechanism to realize congestion control: 3.1) acquiring video data packets by a receiving terminal from a sending terminal; 3.2) judging the current state of the network by adopting the RTP / RTCP at the receiving terminal, and feeding the state back to the sending terminal in a form of a receiving terminal report; and 3.3) adjusting the video transmission rate by the sending terminal by adjusting the video resolution and the frame rate; and (4) realizing real-time interconnection of any equipment terminal to any monitoring point by adopting a mode of point-to-point interconnection. The invention can be effectively suitable for transmitting real-time videos in an unstable wireless channel with low bandwidth, high error code and high delay.

Description

technical field [0001] The invention belongs to the technical field of wireless signal transmission, and relates to a video wireless transmission control method. Background technique [0002] With the rapid development of wireless communication technology, mobile data services have been widely used, and the wireless transmission of streaming video data has become a new research hotspot. Since then, the new generation of monitoring system has gradually begun to get rid of the shackles of "wire" and enter the era of real IP monitoring. [0003] For the current wireless channel, the compression standards that can be used to realize video transmission mainly include MPEG4 of ISO and H.26X of ITU-T. The latest H.264 coding technology has higher coding efficiency, stronger error tolerance and better network adaptability. At the same time, H.264 coding technology can also change the quantization accuracy or time / space resolution of each frame. To adapt to the large bit rate chang...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/24H04N7/26H04W28/10H04W80/06H04L29/08H04N19/146H04N19/164
Inventor 孟利民徐志江华惊宇倪燕杰
Owner ZHEJIANG UNIV OF TECH
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