Dynamic Congestion Control Mechanism in Mobile Adhoc Network: TCP Westwood-DCC
Dynamic Congestion Control Mechanism in Mobile Adhoc Network: TCP Westwood-DCC
复制标题
移动Adhoc网络中的动态拥塞控制机制：TCP Westwood-DCC
DOI：
10.35940/ijrte.e6828.018520
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
S. Mazer
中科院分区：
文献类型：
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作者：
Asmaa EL;Mohammed El Ghazi;Anas Bouayad;Mohammed Fattah Est;M. Bekkali;S. Mazer
传输控制协议面临无线和移动ADHOC网络中数据包损失差异的问题。拥塞控制在这里无法正确完成。它无法根据损失类型管理拥塞窗口，并且不必要地减少了交通拥堵窗口并降低了性能。 TCP Westwood无法确定拥堵或连接故障损失，并且无法按照可用带宽管理拥塞窗口。本文讨论了TCP Westwood执行带宽估计，设置了拥塞窗口和缓慢的开始阈值。在移动Adhoc网络中，链接故障可能经常发生，应正确处理。可以在重新加入超时的帮助下检测到链接故障。一旦暂停，韦斯特伍德就会避免交通拥堵。拟议的韦斯特伍德管理三个拥塞的州1）避免2）拥塞和3）没有拥塞，它根据网络的状态更新拥塞窗口和缓慢的开始阈值。它动态地保持拥塞窗口。网络状态通过估计的带宽和比例比率确定。提出的方法在NS2.35上进行了测试，并将其与现有的TCP变体进行了比较。拟议的韦斯特伍德执行了优化的链路利用和拥塞控制机制。因此，它为损失恢复提供了重要的表现。
Transmission control protocol faces a problem of packet loss differentiation in the wireless and mobile adhoc network. Congestion control is not properly done here. It cannot manage the congestion window as per type of loss and it reduces Congestion window unnecessarily and that degrades the performance. TCP Westwood cannot identify congestion or link failure loss, and it cannot manage the congestion window as per available bandwidth. This paper discusses that TCP Westwood performs bandwidth estimation, setting up a congestion window and a slow start threshold. In mobile adhoc network, link failure may happen frequently, and it should be handled properly. Link failure can be detected with the help of retransmission timeout. Once timeout occurs Westwood performs congestion avoidance. Proposed Westwood manages three states of congestion 1) Avoidance 2) congestion and 3) No congestion, it updates congestion window and slow start threshold as per the status of network. It maintains congestion window dynamically. Network status is identified by estimated bandwidth and proportionality ratio. Proposed method is tested on NS2.35 and compared with the existing TCP variants. The proposed Westwood performs optimized link utilization and congestion control mechanism. Hence it gives significant performance for loss recovery.