低速无线个域网隐蔽站问题研究  

A Study of Hidden Node Problem in LR-WPAN

作　　者：唐琳[1] 高琰[2] 

机构地区：[1]广州大学计算机系,广东广州510006 [2]中南大学通信系,湖南长沙410083

出　　处：《计算机仿真》2009年第3期136-139,共4页Computer Simulation

摘　　要：低速无线个域网标准IEEE802.15.4协议MAC层的主要目标是有效地减少能量的消耗,而并没有考虑如何有效地减少隐蔽站问题的产生。在无线多跳网络中解决隐蔽站问题主要方法有RTS/CTS和调节载波侦听范围等办法,但是均不适用于低速无线个域网。在对基于IEEE802.15.4的时隙CSMA/CA退避算法和隐蔽站问题产生的原理进行深入分析的基础上,得出了在节点均匀分布的情况下退避指数的最小值macminBE相对于发帧成功率的表达式,提出了通过调节macminBE,来减少由于隐蔽站问题引发的帧冲突的方法。并通过NS2仿真实验验证了方法的可行性。克服了现有方法的不足,较大地提高了网络的性能。IEEE802.15.4 is a standard of LR- WPAN. The protocol used to minimize power consumption does not have the hidden - node protection mechanism. The main methods of Ad hoc to solve hidden - node problem are RTS/CTS and Carrier Sense Tuning. They are all unfit for LR - WPAN. So, this paper finds the relations between macminBE and the rate of frame sending, and proposes to use Back - off Exponent tuning to reduce frame collision caused by hidden nodes based on the deep analysis of CSMA/CA back - off algorithm and hidden node problem. And the method is verified by ns2 simulation. This method greatly improved the network performance.

关 键 词：载波侦听 隐蔽站 退避指数 

分 类 号：TP393.03[自动化与计算机技术—计算机应用技术]