标准TCP把A d hoc网络中的移动丢包错误解释为拥塞丢包,从而不必要地启动拥塞控制,降低了TCP性能.目前绝大多数的方法都是利用中间节点的反馈信息来改善A d hoc网络中TCP性能.但当在同一条路由上同时发生多处链路中断时,现有方法在路由重建后不能从正确的状态开始恢复TCP传输,使得TCP在刚恢复传输时就启动‘快速重传/快速恢复’.本文提出的TCP-FSR方法能够很好地解决这个问题,分析和试验证明此方法是有效的.
An improved internetworking approach is proposed to enhance the Internet connectivity which is deteriorated due to unidirectional links and blind rebroadcasting of gateway discovery packets for mobile ad hoc networks. The hybrid gateway discovery scheme that combined the advantages of a proactive and reactive gateway discovery approach is used to achieve high connectivity while keeping overhead costs low. By exchanging ad hoc on-demand distance vector （AODV） hello packet which includes additional fields named symmetric neighbor list and asymmetric neighbor list, unidirectional links are removed from route computation and broadcast storm can also be relieved simultaneously. Performance results using ns-2 simulations, under varying numbers of unidirectional links and node speeds, show that this improved Internet connectivity approach can provide better performance than others.
