【摘要】 802.11是在Adhoc网络中广泛应用的一种媒体接入控制协议。为了研究功率控制机制对系统带来的影响及其产生的原因,该文对一种能完全兼容802.11的分布式功率控制算法802.11DPC进行了仿真。结果显示:在Adhoc网络中,饱和情况下,根据报文长度不同,802.11DPC在网络吞吐率方面较802.11协议提高17%～20%,平均分组时延降低11%～15%,结点能耗及公平性性能则仅有部分提高。对仿真结果给出了合理的解释,得出了在由笔记本电脑等便携终端构成的Adhoc网络中使用功率控制机制更适合用来提高网络吞吐率的结论,为合理使用功率控制机制提供了参考依据。更多还原

【Abstract】 is a MAC protocol that has been widely used in Ad hoc networks.To research the effects the power control mechanism would have on the system,this paper studies a distributed power control algorithm called802.11DPC through simulation,which is fully compatible with802.11.Simulation results show that in an Ad hoc network and a sat-urated situation,it can improve total network throughput by17%～20%,reduce average packet delay by11%～15%whereas it can only improve energy consumption and fairness performance with a limited extent.It gives some reasonable explanations for the simulation results and draw the conclusion that in an Ad hoc network made up of portable termi-nals such as laptop computers,power control mechanism is more appropriate for improving throughput.This provides indi-cations for using power control mechanism more appropriately.更多还原