优先级区分服务的机载网络媒质接入控制协议  

Multi-channel media access control protocol with differential services in airborne network

作　　者：刘炜伦 张衡阳[1] 郑博[1] 高维廷[1] LIU Wei-lun;ZHANG Heng-yang;ZHENG Bo;GAO Wei-ting(Information and Navigation College, Air Force Engineering University, Xi’an 710077, China)

机构地区：[1]空军工程大学信息与导航学院,陕西西安710077

出　　处：《浙江大学学报（工学版）》2019年第1期99-106,共8页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(61701521);博士后科学基金资助项目(2016M603044);航空科学基金资助项目(20150896010;20161996010)

摘　　要：为了保障机载网络的系统容量及最高优先级业务严格的时效性与可靠性需求,提出区分优先级的媒质接入控制协议.该协议对高、低优先级业务,分别采用多信道随机接入和多信道忙闲接入2种不同的信道接入策略,结合竞争窗口随信道忙闲程度自适应调整的退避机制,实现了多优先级区分服务.通过建立多信道忙闲碰撞模型和退避模型,根据高优先级业务的QoS需求,计算求解不同信道数量下低优先级业务的最优负载取值区间和接入门限以及各项系统性能的数学表达式.仿真结果表明,该协议不仅具有较高的系统容量(>10 Mb/s),而且能够保证高优先级业务严格的时效性(<2 ms)、可靠性(>99%)需求,与带差分服务的跳频MAC (PFH-MAC)协议和区分优先级的自适应抖动MAC (PAJ-MAC)协议相比,性能有较大的提升.A differential priority based multi-channel media access control protocol was proposed in order to guarantee the system capacity and strict demands of timeliness and reliability on the high priority traffic in airborne networks. Two different channel access strategies were used which are multi-channel random access and multichannel busy-idle access for high and low priority traffic respectively. A backoff mechanism based on the channel loads was adopted to dynamically adjust the connection window according to the busy degree of channels. Then differential service can be effectively provided. The optimal channel load interval and the access threshold of the low priority traffic in different number of channels as well as all system performance expressions were derived by establishing the multi-channel busy-idle collision model, backoff model and combining with the QoS demand of high priority traffic. The simulation results show that the protocol can ensure the strict timeliness (<2 ms), reliability (>99%) of high priority traffic and system capacity (>10 Mbit/s). The performance was improved much by comparing with priority frequency hopping (PFH-MAC) and prioritized adaptive jitter based media access control (PAJ-MAC) protocols.

关 键 词：机载网络 忙闲程度 多信道 接入门限 退避 区分服务 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]