Research On Wireless Network Congestion Strategy

In the process of digital transformation such as Industry 4.0 and smart manufacturing,the new industrial revolution also puts forward higher requirements for the performance of wireless communication technology.In addition to meeting the reliability and security of the network,it should also have low latency,high throughput and other performance.It not only requires the network layer to provide high-speed communication channels,but also needs to be equipped with efficient congestion control strategies.In the face of TB-level data transmission,inefficient congestion control algorithms will not only lead to low network transmission efficiency,but also directly cause large-area network congestion when the amount of burst data in the network reaches the upper limit of the bottleneck link.Sometimes it can even cause the network to crash,greatly reducing the quality of user experience(QoE).Studies have shown that the message error rate on wired links is only 0.012%-1.2%,while the message error rate on wireless links is 12%,and the bit error rate on wireless links is much higher than that on wired networks.The main reason for this bit error is the white noise interference in the wireless environment.The wireless network environment has inevitable interference with each other in various induction signals,and has the characteristics of high bit error rate.The result is random short-term noise packet loss,which causes the congestion control mechanism to make incorrect congestion judgments and failures.Necessary congestion avoidance causes the sending window to be frequently reduced and the congestion avoidance threshold to continuously decrease.The direct manifestation is that the throughput is not high and the jitter is increased.Therefore,the current TCP congestion control algorithm cannot meet the higher transmission needs of wireless networks.Based on the above problems,the research on wireless network congestion strategy in this paper is mainly divided into two aspects:wireless network noise packet loss perception,wireless network congestion control strategy.First,based on TCP Vegas,a congestion control optimization algorithm for noise packet loss perception-TCP VegasW is proposed,which greatly reduces the impact of noise on wireless network transmission,optimizes network transmission performance,and improves resource utilization efficiency.Secondly,the source uses the improved TCP Vegas w congestion control protocol,and the router uses the random early detection(RED)active queue management algorithm recommended by RFC2309,and establishes a nonlinear dynamic model for TCP VegasW/RED congestion control system.In order to analyze the dynamic behavior of the Hopf bifurcation of the system,the conditions of its occurrence are obtained with the knowledge of bifurcation theory.And it is deduced that various parameters are related to the direction and stability of the Hopf bifurcation solution.In this paper,a hybrid control strategy is selected to control the model in order to delay the occurrence of Hopf bifurcation.It greatly improves the stability of the system and expands the stable area of the system as a result of hybrid control.And proved the effectiveness of the hybrid control technology through simulation and experiment.