Aiming at energy consumption optimisation of 6LoWPAN network,in this paper we propose a channel access mechanism in which the packet arrival rate subjects to Poisson distribution:in active period of the superframe,those nodes without data transmission or unable to send data temporarily will transfer to dormant period for energy saving,then we set up a Markov chain model for this mechanism.Based on the model,we carry out mathematical analysis on the steady state probability of node dormant status,the service time of data packets and the average energy consumption of the node,and study the impact of protocol parameters such as λ and BO on network performance.Mathematical analyses demonstrate that the improved model describes channel competitive process of 6LoWPAN network well and reduces the average energy consumption of node effectively.%针对6LoWPAN网络能耗优化问题,提出一种数据包到达速率服从泊松分布的信道接入机制:超帧活跃期内若没有数据发送或暂时无法发送的节点进入睡眠期以便节能,然后建立该机制的Markov模型.基于该模型,对节点睡眠态稳态概率、数据包服务时间和节点平均能耗进行数学分析,并研究λ和BO等协议参数对网络性能的影响.数学分析表明,改进模型较好地描述了6LoWPAN网络信道竞争过程,有效地降低了节点平均能耗.
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