摘要
节点可以自由、自主地进入网络拓扑并且无须基础网络设施的特性,使得移动Adhoc网络广泛应用于诸如灾难救援、战场等多种环境中.传统的移动Adhoc网络路由协议往往考虑以最少跳数为衡量依据的“最短路径”约束.相关研究表明,最小跳数的路径并不能保证最小的端到端延迟.随着对Adhoc网络支持时延敏感业务流能力的要求,如何降低端到端延迟成为一个新的挑战.对此,着重分析了网络中的节点延迟,基于跨层设计考虑,引入预测延迟方法,提出了基于最小预测延迟的选路机制和延迟主导的自适应路由协议DOAR(delay-orientedadaptiverouting).模拟实验表明,虽然DOAR协议的平均跳数比DSR(dynamicsourcerouting)协议稍有增加,但是网络的平均端到端延迟有了很大的降低.
The characteristic that nodes can enlist into the network topology freely and independently without any fixed infrastructure makes mobile Ad hoc networks (MANET) widely used in various environments such as disaster rescue, battlefield and so on. Conventional mobile Ad hoc routing protocols usually concentrate on the constrained condition of 'shortest path' with minimum hops measurement, However, related researches show that the path with minimum hops can't provide the minimum end to end delay guarantee. Moreover, recently, Ad hoc network is required to support the delay-sensitive traffic. So the reduction of the end to end delay is a new challenge for Ad hoc networks. To this point, this paper mainly focuses on the node delay and a cross-layer method is used to predict the end-to-end delay. Finally, a new routing protocol Delay Oriented Adaptive Routing (DOAR) is presented, which is based on a 'minimum prediction of delay' mechanism. Simulation results show that the derived path length in the proposed DOAR protocol is slightly higher than that of Dynamic Source Routing (DSR) protocol, but it can significantly reduce the average end-to-end delay in both static and mobile scenarios,
出处
《软件学报》
EI
CSCD
北大核心
2005年第9期1661-1667,共7页
Journal of Software
基金
国家高技术研究发展计划(863)
宁波市重点博士科学基金
华为科技基金)~~