Ad-hoc网络的负载自适应MAC协议  

Load Adaptive MAC Protocol of Ad-hoc Network

作　　者：吴心一[1] 赵霞[1] 孟传伟 王祝萍[1] 

机构地区：[1]同济大学电子与信息工程学院,上海201804 [2]上海电信科技发展有限公司,上海200010

出　　处：《自动化仪表》2012年第9期1-4,共4页Process Automation Instrumentation

基　　金：国家863重点基金资助项目(编号:2009AA043001);上海市科委科技攻关计划基金资助项目(编号:10511501002)

摘　　要：基于Ad-hoc网络,提出一种负载自适应MAC协议——LAP。该协议综合考虑了站点个数、帧长度和帧到达率对网络负载的影响,并引入负载因子评估当前网络的负载状况。当负载因子小于切换阈值时,LAP采用基于竞争的CSMA/CA机制;反之,则采用基于非竞争的Token-Ring机制。仿真证明,该协议能在重负载和轻负载环境中有效控制接入延时,最终提高网络实时性。Load awareness protocol （ LAP ） , a load adaptive MAC protocol of Ad-hoc network is proposed. It comprehensively considers the influence of station number, frame length and frame arrival rate to network load, and load factor is introduced to evaluate the current load condition of network. When the load factor is less than switching threshold, LAP adopts CSMA/CA mechanism based on competition; otherwise Token-Ring mechanism based on non-competition is adopted. Simulation shows that the protocol controls access delay effectively under heavy- load and light-load situation, and improves the real-time performance finally.

关 键 词：MAC协议 负载因子 CSMA/CA机制 Token-Ring机制 接入延时 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]