一种抖动窗口自适应的航空通信MAC协议QoS机制

A media access control protocol QoS mechanism based on adaptive jitter window in aeronautical networks

根据面向"时敏目标"打击的航空通信系统信息传输要求,提出了一种差分服务媒质接入控制协议。协议采用多信道随机接入机制,通过信道忙闲程度自适应地调整各优先级业务的发送时延抖动窗口的方法,为各优先级业务提供差分服务。在分组排队阶段,建立了M/G/1/K排队模型,得到了稳定状态下发送缓冲区队列长度的概率;在分组服务阶段,建立了突发时延抖动自适应模型,得到了分组的平均服务时间;在分组传播阶段,建立了突发碰撞模型,得到了分组成功传播概率;然后推导了该协议的平均时延、传输成功率和系统吞吐量等性能指标的理论表达式,并给出了最大抖动窗口的设置原则。仿真结果表明,协议大大提高了系统重负载情况下高优先级业务的实时性和可靠性,适用于区分业务优先级且对高优先级业务的实时性和可靠性要求很高的航空通信组网系统。

According to the rigid demands of aeronautical communication for time-sensitive target attack,a media access control protocol with Qo S is proposed. It provides differential services by adaptive adjustment of delay jitter window according to channel occupancy statistic. First,in packet queue stage,the queue length under steady-state conditions is derived from M / G /1 / K queuing theory. Second,in packet service stage,the average packet service time is obtained by modeling the adaptive sending delay jitter mechanism. Then,in packet propagation stage,the packet successful propagation probability is acquired by modeling burst collision process. Finally,the mean delivery delay,successful transmission probability,system throughput are deduced and the principles of setting the max window are offered. The simulation results verify that it significantly increases the timeliness and reliability of high priority under heavy traffic load,so it can be applied to aviation communication network system with strict demand on timeliness and reliability.