【摘要】 为提高802.15.4网络媒体接入控制(MAC)层数据传输可靠性,提出一种基于非饱和态的节点工作过程的Markov链模型,对节点状态的稳态概率进行推导计算。研究影响数据包在MAC层传送可靠性的两个因素,即节点访问信道不成功和最大重传次数限制,并推导出可靠性性能的分析式。分析参数minBE,NB,λ以及两个因素对可靠性的影响。实验结果表明,与没有休眠机制的节点工作模型相比,该模型能够有效地降低信道冲突,提高网络的可靠性。更多还原

【Abstract】 In order to improve the data transmission reliability in Media Access Control(MAC) layer for 802.15.4 network,this paper proposes a Markov chain model of node working process based on unsaturated state,and the derivation calculation is carried out for the steady-state probability of the node status. The two factors affecting the transmission reliability in MAC layer are researched: the failure of node access channel and the limit of maximum retransmission times,and the analytical formula of reliability performance is derived. The influence of the parameters including min BE,NB and λand two factors on the reliability is analyzed,and the effects of the two kinds of factors on the reliability performance are compared. Experimental results show that compared with the node working model without sleep mechanism,the proposed model can greatly reduce channel conflict,and improve network reliability.更多还原