基于MATLAB的TDMA/CSMA混合协议仿真分析  

Research and Simulate on TDM A and CSMA mixed multiple access protocol Based on MATLAB

作　　者：王凯锐 荆敏[2] 康乐峰[1] 张宏伟[1] 张丽蓉[1] WANG Kai-rui;JING Min;KANG Le-feng;ZHANG Hong-wei;ZHANG Li-rong(North Automatic Control Technology Institute,Taiyuan 030006,China;Beijing Armed Vehide Proving Ground,Beijing 100072,China)

机构地区：[1]北方自动控制技术研究所,太原030006 [2]北京特种车辆研究所,北京100072

出　　处：《火力与指挥控制》2017年第2期163-167,共5页Fire Control & Command Control

摘　　要：TDMA(时分多址)和CSMA(载波侦听)是两种常见的Ad Hoc网络多址接入方式,两种方法各有利弊。TDMA避免了节点之间的冲突,但是平均时延随着网络规模的扩大而急剧增长,当某节点在给定的时隙内没有发送请求时,会产生空时隙,造成资源浪费;CSMA采用竞争的方式,当网络规模扩大时,节点的碰撞概率很大,信道利用率降低。根据两者的特点,提出了TDMA/CSMA混合多址接入协议,采用固定分配和动态分配相结合的方式,进一步提高网络吞吐量、降低平均时延,并通过MATLAB软件对协议进行仿真建模,验证其性能。TDMA and CSMA are two kinds of common multiple accesses protocols of Ad Hocnetwork,they have both advantages and disadvantages.TDMA can avoid collision among differentnodes,but average delay becomes longer when network scale expands,at the same time,if some nodesdon’t have transmission requirement in its slots,there will be free slots.CSMA uses competitionpattern,but collision probability of nodes increases when network scale expands.According to two kindsof protocols,this paper presents a kind of mixed multiple accesses protocol which combines TDMA withCSMA.Using fixed distribution and dynamic distribution to improve network efficiency and decreaseaverage delay.Using MATLAB software to simulate and prove its property.

关 键 词：MAC层 多址接入 时分复用 载波侦听 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]