基于非饱和负载的802.15.4网络能耗分析

摘要

为了优化802.15.4 MAC协议能耗性能,提出了一种基于退避时提前休眠的时隙CSMA/CA机制,并建立了该协议的Markov链模型.然后使用M/G/I排队系统理论对非饱和网络负载建模,并对协议主要参数进行了数学推导.最后基于该模型对网络节点能耗进行数值分析.理论分析和仿真结果表明,该模型较好地描述了基于非饱和负载的802.15.4 MAC协议,网络节点平均能耗得到有效改善.%To optimize the performance of power consumption in IEEE 802.15.4 MAC, this paper proposed a mechanism that advancing sleep in backoff stage for slotted CSMA/CA algorithm, and established a Markov chain model for it.Then, proposed a new model for unsaturated traffic in networks by M/G/1 queueing system, and gave out an expression using the new model for calculating the main parameters.Furthermore,carried out the numerical analysis based on the model of the node power consumption.Finally, it is showed by the theoretical analysis and simulation results that the model describe the slotted CSMA/CA mechanism based on unsaturated traffic well, and the performance of node power consumption is improved effective.