【摘要】 IEEE802.15.4协议引入了延时线的概念,给协议带来了一定的影响。通过探讨工作在饱和状态、星形拓扑、信标使能的传感器网络下带时隙的马尔可夫链模型,推导出了该状态下的延时计算公式。仿真表明,延时线对延时的影响可以忽略,主要起节能作用。针对延时线的引入导致接入概率降低的问题,提出了让接入时隙的分布和节点数据长度相关的解决方案。更多还原

【Abstract】 The protocol is studied and the expression of access delay with delay line operating under the IEEE standard 802.15.4 by Markov chain model is derived in the beacon enabled,saturation mode,star topology with slotted.The effect of delay line is analysed.The simulation results indicate that the effect of delay line on delay can be ignored,but it can save the energy.Also,if the slots accessing channel are correlated to the size of data packet,the delay line’s effect can be decreased.更多还原