【作者】 王强；

【导师】 吴春明；

【作者基本信息】 浙江大学 ， 计算机应用技术， 2007， 硕士

【摘要】 移动Ad Hoc网络是没有基础设施支持的网络，由于网络中的大多数节点是由有限能量的电池来供电，因此如何提高网络能量的效率，延长网络中节点的存活时间成为关键问题。产业界也一直在寻找延长节点工作时间的方法。本文首先对几种典型的节能机制和路由协议进行了分类和总结，并比较了它们各自的性能。接着提出了一个基于AODV协议的节能机制，将节点的剩余能量分为正常、警告、危险三个等。路由请求分组(RREQ)只有在节点的剩余能量处于非正常等级(警告和危险等级)时，才根据时延模型进行延迟转发。而剩余能量处于正常等级的节点，直接转发所有分组；处于警告等级的节点，小概率丢弃非RREQ分组；处于危险等级的节点，大概率丢弃非RREQ分组。为了更加公平、准确的反映Ad Hoc网络的实际情况，又提出了基于AODV协议的动态节能机制，兼顾了当前节点的所有邻居节点的能量情况。本文提出的节能机制的主要目的是保护低等级能量的节点，均衡网络的负载，从而提高能量的使用效率，延长网络中节点的存活时间。最后将该机制在NS2上进行了多次不同参数配置的仿真，并取得了较理想的结果，文中给出了详细的分析。更多还原

【Abstract】 Mobile Ad Hoc Network is a network without static infrastructure and energy-limited batteries host in most nodes in the network. Therefore, how to save power and increase longevity of the network is a crucial issue. Industrial circles have been trying to use power-saving mechanisms to increase the longevity of the batteries. At first in this paper, some typical power-saving mechanisms in Ad Hoc wireless network are introduced, classified and compared. Then, a new mechanism is proposed based on AODV protocol, which classifies the remaining power of the nodes into three levels, named normal level, warning level and dangerous level. Nodes under normal level will forward the packet without delay; Nodes under non-normal level will delay the Route Request Packet (RREQ) forwarding according to the delay model. Nodes under warning level will drop the non-RREQ packets with a low probability and nodes under dangerous level will drop the non-RREQ packets with a high probability. To reflect the real condition of Ad Hoc network more fairly and precisely, the paper forward a dynamic power-saving mechanism based on AODV protocol which gives attention to the power condition of neighbor nodes of current node. The purposes of these mechanisms are to protect the nodes which have low remaining energy, improve the efficiency of power and increase the longevity of the network. The mechanism is simulated on NS2. The simulation results show that the mechanism works well and achieve a good performance.更多还原