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Video wireless transmission control method suitable for CDMA2000

A control method and wireless transmission technology, applied in the direction of pulse modulation television signal transmission, wireless communication, transmission system, etc., to overcome high bit errors and achieve the effect of congestion control

Inactive Publication Date: 2010-12-08
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 drawings.

[0032] Reference figure 1 with figure 2 , A video wireless transmission control method suitable for CDMA2000, the video wireless transmission control method includes 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 transmission 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 package and send; otherwise, it must be sent in packets. When sending in packets, it is judged whether it is the first packet of FU-A. If it is, the starting packet header of FU-A is added and sent, otherwise it is judged whether it is the last of FU-A. For a packet, add the end header of FU-A and send it; otherwise, add the header of t...

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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 media video data has begun to become a new focus of research. Since then, the new generation of surveillance systems has gradually begun to get rid of the shackles of "wire" and enter the era of real IP surveillance. [0003] For current wireless channels, compression standards that can be used to realize video transmission mainly include ISO's MPEG4 and ITU-T's H.26X. The latest H.264 encoding technology has higher encoding efficiency, stronger fault tolerance and better network adaptability. At the same time, H.264 encoding technology can also change the quantization accuracy or time / spatial resolution of each frame. To adapt to the large bi...

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Application Information

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Patent Type & Authority Applications(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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