Ad-hoc网络的负载自适应MAC协议

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人延时,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.