基于拥塞反馈的Semi-TCP优化方法

Semi-TCP optimization method basedon congestion feedback

Semi-TCP根据无线多跳网络的特性,利用跨层设计的思想,端到端的拥塞控制调整为节点之间逐跳的拥塞控制,将传输层的拥塞控制下移到MAC层,形成递归逐跳的拥塞控制,旨在提高拥塞控制的效率和拥塞处理的即时性。现有的算法要通过增加或修改MAC控制帧的方式来实现拥塞的控制,因而需要对节点已安装的MAC层协议做适当的修改。文中提出了一种基于拥塞反馈的优化方法,不需要对传统TCP协议进行太多的修改。在EXata平台上进行了仿真,证明了该优化方法的有效性。

According to the characteristics of wireless multi hop network,Semi-TCP adopts the idea of cross layer design. The end to end congestion control is adjusted to hop by hop congestion control between nodes. The congestion control of the transmission layer is moved down to the MAC layer to form a recursive hop by hop congestion control,which aims to improve the efficiency and the immediacy of congestion control. The existing algorithms can achieve congestion control by adding or modifying the MAC control frame,so it is necessary to make appropriate modifications to the MAC layer protocol installed by the node. In this paper,a congestion feedback based optimization method is proposed,which does not require too much modification to the traditional TCP protocol. Simulation is carried out on the EXata platform,which proves effectiveness of the optimization method.