非饱和态802.15.4网络MAC层数据传输可靠性研究  

Study on Data Transmission Reliability in MAC Layer for Unsaturated State 802.15.4 Network

作　　者：程宏斌[1] 王晓喃[1] 王海军[2] 孙霞[1] 乐德广[1] 张雪伍[1] 

机构地区：[1]常熟理工学院计算机科学与工程学院,江苏常熟215500 [2]湖北第二师范学院计算机学院,武汉430205

出　　处：《计算机工程》2017年第1期126-130,共5页Computer Engineering

基　　金：国家自然科学基金(61202440);江苏省自然科学基金(BK20141230);湖北省自然科学基金(2015CFB405);湖北省教育厅科研项目(Q20153003);江苏省高校自然科学研究项目(13KJB420001)

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。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 minBE,NB and λ and 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.

关 键 词：媒体访问控制 可靠性 非饱和态 马尔科夫链 数据传输 

分 类 号：TP393.03[自动化与计算机技术—计算机应用技术]