Ad Hoc网络链路持续时间计算模型

Calculating Model of Link Duration in Mobile Ad Hoc Network

链路持续时间是衡量Ad Hoc网络动态性的重要参数,对网络的路由协议性能和网络性能有直接影响。链路持续时间的计算为设计Ad Hoc网络路由协议、评价网络性能及描述网络动态性提供了理论依据,是计算路径持续时间的基础,目前尚无链路持续时间的准确计算方法。基于统计原理,该文提出适用多种Ad Hoc网络移动模型的链路持续时间计算模型,推导出链路持续时间概率分布的精确公式,得到链路持续时间和移动模型参数的关系和相关的动态性参数(平均链路持续时间、链路变化率)的计算公式。通过ns-2仿真实验验证了公式的正确性。

Link duration is an important metrics to measure the mobility of mobile Ad Hoc network and it directly influences the performance of networks and the routing protocols.But no exact calculating method of link duration has been proposed at present.This paper proposes a calculating model which adapts to many mobile Ad Hoc network mobility models,derives the exact statistic distribution equation of link duration and some calculating equations of metrics to measure mobility（such as average link duration,path duration and link change rate）,analyzes the contribution of mobility model direct metrics to the link duration.The correctness of the equation is validated by simulations using ns-2 simulator.This research provides theoretical foundations for calculating path duration,designing mobile Ad Hoc network routing protocols,measuring mobility and researching on performance of network protocols.