应用于航空Ad Hoc网络的高负载优先级均衡MAC协议

摘要

For the low latency problem of channel access in aviation Ad Hoc network under high load, a multi-channel MAC protocol called PBLL/HL based on the priority and collaborative fairness is put for-ward. On the basis of statistical multi-channel detection,PBLL/HL optimizes the network traffic to ensure successful high priority data transmission with low latency by closuring the low priority data. It also lowers the latency of low priority data with PCA( Priority Threshold and Conflict Back-off Algorithm) . The simula-tion results prove that PBLL/HL maintains an optimized network traffic by effectively controling channel access under high load,lowers the average access delay( Lowers the latency of low priority data more than 10% when the data overload ) , keeps the throughput steady under high load ( Maximum throughput is 88. 1%,the throughput falls flat when the data overload) and solves the problem of high latency and jam caused by high traffic in aviation data link.%针对航空Ad Hoc网络在高负载下的低时延信道接入问题,提出一种优先级与公平性协作的多信道MAC协议( PBLL/HL)。在多信道检测统计基础上加以改进,结合优先级机制,在高负载网络中适时截流低优先级业务,优化网络流量,保证高优先级业务低时延发送；设计公平性优先级阈值与冲突退避窗口算法( PCA),减小低优先级业务接入时延。仿真结果表明,PBLL/HL能够在高负载网络有效控制信道接入,维持良好的网络流量,降低网络平均接入时延(低优先级业务时延过载时降低10%以上),稳定高负载网络吞吐量(最大吞吐量88.1%,过载时吞吐量下滑平缓),解决了航空数据链高业务量带来的高时延和网络拥塞。