基于重传的802.15.4网络MAC层丢包率研究  

Research on packet lost rate of MAC layer for 802.15.4 networks based on the retransmission mechanism

作　　者：程宏斌[1] 王晓喃[1] 王海军[2] 孙霞[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,湖北武汉430205

出　　处：《电子技术应用》2016年第4期103-105,110,共4页Application of Electronic Technique

基　　金：国家自然科学基金(61202440);江苏省高校自然科学研究项目(13KJB420001)

摘　　要：为了降低802.15.4网络数据帧的丢包率,分析了基于重传机制的丢包率问题,提出MAC层节点工作过程的数学模型,并分析推导了节点主要工作状态的稳态概率;然后对数据帧重传概率和丢包率进行数学分析;最后通过实验比较了MAC层参数minBE、NB和网络环境参数λ、N、BER对重传概率和丢包率的影响。结果表明,与无重传机制的数据传输性能比较,节点丢包率平均降低了88.9%,模型准确反映了节点的数据传输特点,均衡的参数部署有效地提高了数据传输成功率,理论研究为802.15.4标准的应用提供了参考。In order to decrease the frame packet lost rate in 802. 15. 4 network, this paper analyzed the packet lost rate based on the retransmission mechanism, proposed the mathematical model for the working process of network node in MAC layer, and derived the steady- state probability of the main state. Afterwards, this paper carried out the mathematical analysis for the retransmission probability and the packet lost rate. Finally, the effect of MAC layer parameters min BE, NB and network environment parameter λ 、N 、 BER on the retransmission probability and the packet loss rate was compared through the experimental analysis. Experimental re-sults show that the node packet loss rate is reduced by 88. 9 %, compared with the data transmission performance without retrans-mission mechanism. And the model could accurately reflect the node data transmission characteristics. Furthermore, equilibrium pa-rameter deployment could effectively improve the data transmission success rate, and theoretical research could provide the reference for 802. 15. 4 network standard.

关 键 词：802.15.4 模型 丢包率 重传概率 

分 类 号：TN926[电子电信—通信与信息系统]