Sending code rate adjusting method and system for wireless network video

Abstract

The invention provides a sending code rate adjusting method and system for a wireless network video. The method comprises the steps: multi-rate network detection is conducted at a current time periodfor no less than once, wherein during each time of multi-rate network detection, a detection stream is sent at different rates for at least twice, and packet receiving information fed back by detection stream sending at the various rates is received; according to packet sending information and the packet receiving information of at least twice of detection stream sending, detection information corresponding to each time of multi-rate network detection is obtained; according to the detection information, a network available bandwidth model corresponding to each time of multi-rate network detection is obtained; according to the network available bandwidth models and the predetermined network transmission probability, a target sending code rate of the wireless network video is calculated; anda video service of a next time period is sent according to the target sending code rate. According to the method and system, on the basis of ensuring the friendliness with other TCP streams, the utilization rate of the network available bandwidth and the sending rate of the video service are increased.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method and system for adjusting the transmission code rate of wireless network video. Background technique [0002] In recent years, with the popularity of mobile networks, video applications based on network transmission have gradually been widely used. In the field of public security, there are all-weather and all-terrain requirements for video transmission, and providing high-definition video transmission with low delay is conducive to timely grasping of on-site conditions. However, due to the inherent defects of wireless networks, packet loss will occur during network transmission. The reasons for packet loss can be roughly divided into two categories: one is due to network congestion, and the current network cannot carry a high bit rate; the other is caused by wireless link errors, such as bit errors, poor wireless network quality, etc. . No matter what c...

AI Technical Summary

Problems solved by technology

[0004] The currently popular TCP-Friendly Rate Control algorithm (TCP-Friendly Rate Control, TFRC) performs congestion avoidance on the basis of maintaining the friendliness of the TCP flow, and has achieved good results in the transmission of wired channels. In the environment, due to the complexity of the channel environment, the expected effect cannot be achieved

In view of the wireless network environment with complex channel environment, the cause of data loss is not limited to network congestion

The high bit error rate of the wireless link has become the main cause of network congestion. The available bandwidth of the network is not estimated and predicted, and the rules in the wired network are directly adopted, which will inevitably reduce bandwidth utilization.

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