论文部分内容阅读
详细分析了传统的TCP拥塞控制算法在无线多跳网络环境下面临的问题,指出无线多跳环境下的MAC层信道竞争以及TCP拥塞窗口的过激增长机制是影响TCP性能的主要原因,提出一种新的TCP跨层拥塞控制机制TCP-CR.该机制中节点通过MAC层维护的链表信息,将冲突概率定时向源节点的传输层进行反馈,源节点根据获取的反馈信息做出拥塞窗口调整.仿真结果证明,该机制中源节点能有效根据当前MAC层网络状况做出及时动态调整,从而提高TCP的吞吐量.
The problems that traditional TCP congestion control algorithm faces in wireless multi-hop network environment are analyzed in detail. It is pointed out that the channel competition in MAC layer in wireless multi-hop environment and the excessive growth mechanism of TCP congestion window are the main reasons that affect TCP performance. A new TCP cross-layer congestion control mechanism TCP-CR, in which the node periodically feeds back the collision probability to the transport layer of the source node through the linked list information maintained by the MAC layer, and the source node adjusts the congestion window according to the obtained feedback information. The simulation results show that the source node in this mechanism can make dynamic and timely adjustment according to the current MAC layer network conditions, thus improving the throughput of TCP.