基于减少偷听的IEEE802.15.4网络节点能耗降低方法

摘要

为了优化IEEE 802.15.4 MAC协议能耗性能,针对IEEE 802.15.4 MAC协议存在的空闲偷听现象浪费节点能量问题,提出一种基于减少偷听的降耗方法:节点于超帧竞争接入时期内的退避时期适时地进入休眠状态.应用该方法建立了IEEE 802.15.4 MAC时隙CSMA/CA机制的Markov模型,并对模型进行了数学推导.基于本模型,对网络节点平均能耗进行了数学分析.理论分析和仿真结果表明,该模型有效地降低了节点的平均能量消耗和空闲偷听时间,协议性能得到有效改善.%Aiming at the problem of node' s energy waste because of the idle overhearing existed in IEEE 802. 15.4 MAC,this paper proposed a method that node converting into sleep mode timely in CAP to decreasing node power consumption based on the reduced overhearing. Then established a Markov chain model and carried out the mathematical derivation for the model. Furthermore,carried out the numerical analysis of the node average power consumption. Finally, the theoretical analysis and simulation results show that the model reduces the node average energy consumption and the time of idle overhearing effective ly , and improves effectively the performance of protocol.