Transmission Control Protocol （TCP） in infrastructure based vehicular net- works is dedicated to support reliable Intemet services for mobile users. However, an end-to- end TCP flow not only experiences some com- mo...Transmission Control Protocol （TCP） in infrastructure based vehicular net- works is dedicated to support reliable Intemet services for mobile users. However, an end-to- end TCP flow not only experiences some com- mon challenges in wireless mobile networks, such as high packet loss rate, medium access competition, unstable wireless bandwidth, and dynamic topology, etc., but also suffers from performance degradation due to traffic congestion at the Road-Side Units （RSUs） that connect the wireline and wireless networks. In order to address the challenging issues related to reliable TCP transmissions in infrastruc- ture based vehicular networks, we propose an RSU based TCP （R-TCP） scheme. For wireline source nodes, R-TCP adopts a novel flow control mechanism to adjust transmission rates according to the status of bottleneck link. Specifically, during the short wireless connec- tion time in Infrastructure based vehicular net- works, R-TCP quickly chooses an ideal trans- mission rate for data transmissions instead of activating the slow start algorithm after the connection is established, and successfully avoids the oscillation of the transmission rate. Simulation results show that R-TCP achieves great advantages than some relate proposals in terms of throughput, end-to-end delay, and packet loss rate.展开更多
由于低功耗有损网络LLN (low power and lossy networks)呈树形结构且节点的能量受限,一旦网络中出现能量瓶颈节点而未及时处理,将会严重影响网络各方面性能。因此提出一种基于负载均衡的高能效LLN路由协议。当检测出能量瓶颈节点后,对...由于低功耗有损网络LLN (low power and lossy networks)呈树形结构且节点的能量受限,一旦网络中出现能量瓶颈节点而未及时处理,将会严重影响网络各方面性能。因此提出一种基于负载均衡的高能效LLN路由协议。当检测出能量瓶颈节点后,对溪流计时器重置策略进行改进,及时将能量瓶颈节点能量不足的状态通告给其子节点。提出一种能量瓶颈节点子节点的切换机制,旨在降低能量瓶颈节点的能耗速率,实现节点高能效。仿真结果表明,该方法在网络生存时间和节点死亡率等性能方面优于现有路由算法,其中网络平均生存时间延长了10.53%,节点死亡率降低了18.59%。展开更多
基金supported in part by Fundamental Research Funds for the Central Universities of China under Grant(N140405004) partly by National Natural Science Foundation of China(61373159)+1 种基金partly by Educational Committee of Liaoning Province science and technology research projects under Grant (L2013096)partly by Key Laboratory Project Funds of Shenyang Ligong University (4771004kfs03)
文摘Transmission Control Protocol （TCP） in infrastructure based vehicular net- works is dedicated to support reliable Intemet services for mobile users. However, an end-to- end TCP flow not only experiences some com- mon challenges in wireless mobile networks, such as high packet loss rate, medium access competition, unstable wireless bandwidth, and dynamic topology, etc., but also suffers from performance degradation due to traffic congestion at the Road-Side Units （RSUs） that connect the wireline and wireless networks. In order to address the challenging issues related to reliable TCP transmissions in infrastruc- ture based vehicular networks, we propose an RSU based TCP （R-TCP） scheme. For wireline source nodes, R-TCP adopts a novel flow control mechanism to adjust transmission rates according to the status of bottleneck link. Specifically, during the short wireless connec- tion time in Infrastructure based vehicular net- works, R-TCP quickly chooses an ideal trans- mission rate for data transmissions instead of activating the slow start algorithm after the connection is established, and successfully avoids the oscillation of the transmission rate. Simulation results show that R-TCP achieves great advantages than some relate proposals in terms of throughput, end-to-end delay, and packet loss rate.
文摘由于低功耗有损网络LLN (low power and lossy networks)呈树形结构且节点的能量受限,一旦网络中出现能量瓶颈节点而未及时处理,将会严重影响网络各方面性能。因此提出一种基于负载均衡的高能效LLN路由协议。当检测出能量瓶颈节点后,对溪流计时器重置策略进行改进,及时将能量瓶颈节点能量不足的状态通告给其子节点。提出一种能量瓶颈节点子节点的切换机制,旨在降低能量瓶颈节点的能耗速率,实现节点高能效。仿真结果表明,该方法在网络生存时间和节点死亡率等性能方面优于现有路由算法,其中网络平均生存时间延长了10.53%,节点死亡率降低了18.59%。
