无线Ad hoc网络中MAC层与TCP层跨层协作技术的研究

Performance research of cross-layer protocols based on MAC layer and TCP layer in wireless Ad hoc networks

在无线多跳Ad hoc网络中,网络的丢包主要是由于MAC层介质竞争引起的,而不是传统的路由器缓存队列的溢出。因此,文章分析了四种能反映MAC层竞争程度的拥塞测度,提出基于MAC层拥塞测度的TCP跨层优化协议。通过仿真实验表明该方法能极大地提高无线网络性能。

Packet losses due to link-layer contention dominates in wireless Ad hoc networks, rather than the traditional router buffer overflow. An analysis has been made of four congestion metrics which can reflect the degree of medium contention at the MAC layer in this paper. A cross-layer TCP protocol based on the novel use of congestion metrics at MAC layer was proposed. Extensive simulations show that it can prominently improve transport layer performance in wireless multihop Ad hoc networks.