嵌入式视觉系统以太网通信拥塞控制改进_马敏锐_白瑞林_邹骏宇.pdf

网络出版时间：2015-01-16 11:22 网络出版地址：/kcms/detail/11.2127.TP1122.008.html 1 Computer Engineering and Applications 计算机工程与应用 嵌入式视觉系统的以太网通信拥塞控制改进 1 1 2 马敏锐 , 白瑞林 , 邹骏宇 1 1 2 MA Minrui , BAI Ruilin , ZOU Junyu 1.江南大学 轻工过程先进控制教育部重点实验室,信息与控制实验教学中心,江苏 无锡 214122 2.无锡信捷电气股份有限公司,江苏 无锡 214072 1.Key Laboratory of Advanced Process Control for Light Industry (Ministry of Education), Information and Control Experiment Teaching Center, Jiangnan University, Wuxi, Jiangsu 214122, China 2.Xinje Electronic Co., Ltd., Wuxi , Jiangsu 214072, China MA Minrui, BAI Ruilin, ZOU Junyu. Modified ethernet communication congestion control in embedded vi- sion system. Computer Engineering and Applications Abstract ：For local Ethernet in embedded machine vision system, low transmission efficiency and pseudo retrans- mission will happen due to RTO lag behind RTT when transmission congestion occur in the transmission of a large amount of image data. So a method of ethernet congestion prevention based on modified LwIP is proposed in the multiple embedded vision system. Firstly, the ethernet communication platform of embedded machine vision system which contains Cortex-A8, μC/OS-III and LwIP must be built. Then, we introduce NewReno algorithm in the TCP congestion control mechanism of LwIP to overcome the influence of transmission efficiency caused by many times rapid recovery and slow start when multiple packets loss in a send window. Finally, we introduce the normalized least mean square error algorithm to reduce false retransmission in the TCP data transmission when the RTO valua- tions are imprecise. Experimental results show that the method can more effectively tackle the problem of packets loss and reduce the pseudo data retransmission. What’s more, it has also increased the network throughp