一种支持QoS的航空自组织网络无反馈MAC协议建模

Model providing QoS guarantee for feedback-free MAC in aeronautical Ad Hoc networks

针对航空自组织网络的高动态特性和对高优先级业务的服务质量(Qo S)要求,提出了一种无反馈介质访问控制(MAC)协议建模方法及相应的阈值设置方法,以保证高优先级数据分组的时效性及可靠性。首先,对数据分组在接收端碰撞建立时间约束模型,得到信道统计结果与分组成功概率的映射关系;然后,根据不同业务的Qo S要求设置接入阈值;最后,实现对不同优先级业务的接入控制。仿真结果表明,在典型空域网络场景下,基于该建模方法的无反馈MAC协议可以为高优先级业务提供Qo S保证,即分组成功概率大于99%,端到端延时小于1 ms。

In aeronautical Ad Hoc networks,in order to meet the strict quality of service（ Qo S） requirements of high priority traffic with high dynamics,a modeling method and a corresponding threshold setting method for priority feedback-free media access control（ MAC） protocols were proposed to guarante etimeliness and reliability of high priority packets. First,a time constraint model was built at receiving end,with a mapping relation between channel statistics and packet success probability being deduced. Accordingly,the access threshold basedon Qo S requirements of different traffic was obtained,while access control of different traffic was accomplished. Simulation results indicate that,in typical aeronautical networks,the Qo S requirements of high priority traffic can be guaranteed as the feedback-free MAC based on the proposed method is employed. In particular,packet success probability of high priority traffic is higher than 99%,and end-to-end delay is less than 1 ms.