面向物联网应用的动态切换CoAP模式  

Discussion on dynamic CoAP mode in internet of things

作　　者：金智[1] 刘蓉[1] JIN Zhi;LIU Rong(School of Information Engineering,Changsha Medical University,Changsha410219,China)

机构地区：[1]长沙医学院信息工程学院

出　　处：《导航定位学报》2019年第4期24-29,共6页Journal of Navigation and Positioning

基　　金：湖南省教育厅重点项目(18A496)

摘　　要：为了平衡物联网时延与数据包传输可靠性之间的关系,根据受限制的应用协议(CoAP)中确认模式和非确认模式的特点,对CoAP模式进行研究:依据无线信道条件,推导CoAP的2个模式下的数据包丢失率的表达式;利用最大似然估计算法估计参数,并计算确认模式和非确认模式下的数据包丢失率;最后依据应用对数据包丢失率的要求,采用动态CoAP模型达到平衡传输时延和吞吐量的目的。实验结果表明,推导的数据包丢失率表达式能够与实验数据相匹配,同时,动态CoAP模式能够有效地平衡传输时延和吞吐量性能。In order to balance the relationship between the delay and packet transmission reliability in internet of things,according to the characteristics of non-confirmable mode and confirmable mode in the constrained application protocol(CoAP),the paper studied on the CoAP mode:according to the condition of wireless channel,the expressions of data packet loss rate in the two modes of CoAP were deduced;the parameters were estimated by maximum likelihood estimation(MLE),and the data packet loss rates under the two modes were calculated then;finally the dynamic CoAP mode was used to balance the delay and data throughput with the requirement of the application layer on packet loss rate.Experimental result showed that the formula of packet loss rate could match the experimental data,meanwhile,dynamic CoAP mode could effectively balance the delay and throughput performance.

关 键 词：物联网 受限制的应用协议 数据包丢失率 确认模式 非确认模式 

分 类 号：P228[天文地球—大地测量学与测量工程]