WSN中碰撞时长可变的三时隙1P⁃CSMA协议分析  

Analysis of 1P⁃CSMA protocol with variable collision duration and three time slots in WSN

作　　者：李明亮 丁洪伟[1] 李波[1] 保利勇[1] 李浩[2] LI Mingliang;DING Hongwei;LI Bo;BAO Liyong;LI Hao(School of Information Science and Engineering,Yunnan University,Kunming 650500,China;Office of Science and Technology,Yunnan University,Kunming 650500,China)

机构地区：[1]云南大学信息学院,云南昆明650500 [2]云南大学科技处,云南昆明650500

出　　处：《现代电子技术》2021年第9期12-18,共7页Modern Electronics Technique

基　　金：国家自然科学基金资助项目:融合式多址通信网络理论与控制协议研究(61461053);无线网络中轮询控制系统分析与改进的研究(61461054)。

摘　　要：对传统的1坚持载波侦听多路访问(1P⁃CSMA)协议在传输控制无线传感器网络系统方面和解决其能耗问题上,提出一种在WSN中碰撞时长可变的三时隙1P⁃CSMA协议。该协议在传统的1P⁃CSMA协议的双时隙模型的基础上,提出了碰撞时长b的概念,将系统的时隙划分为信息分组发送成功的时长1+a、发生碰撞的时长b+a以及系统处于空闲状态的时长a的三时隙模型。通过分析该模型得到了系统的吞吐量、碰撞率、空闲率、通过改变发生碰撞的时隙长度b降低系统的损耗,与传统的1P⁃CSMA协议相比得到了改善,并在电池模型的基础上使系统节点的生命时长T有所增长,最后通过实验仿真,验证了理论推导的准确性。There are some difficulties when the traditional 1⁃persistent carrier sense multiple access(1P⁃CSMA)protocol is used to transmit and control wireless sensor network(WSN)systems and reduce its energy consumption.Therefore,a new 1P⁃CSMA protocol with variable collision duration and three time slots in WSN is proposed.In the protocol,the concept of collision duration b is proposed on the basis of the two time slots model of the traditional 1P⁃CSMA protocol.The time slot of the system is divided into the duration 1+a of information packet being sent successfully,the duration b+a of information packet collision and the duration a of the idle state of the system.The throughput,collision rate and idle rate of the system are obtained by analyzing the model.The loss of the system is reduced by changing the duration b of the collision time slot.In comparison with the traditional 1P⁃CSMA protocol,the system loss has been improved,and the life duration T of the system node based on the battery model is increased somewhat.The accuracy of the theoretical derivation was verified by the simulation experiments.

关 键 词：1P⁃CSMA协议 时隙模型 WSN 碰撞时长可变 时隙划分 吞吐量 碰撞率 空闲率 

分 类 号：TN915.04-34[电子电信—通信与信息系统] TP212[电子电信—信息与通信工程]