基于发送时延自适应抖动的多信道MAC协议

Multi-channel Media Access Control Protocol Based on Sending Delay Adaptive Jitter

为保障机载自组网中各类飞行器在执行情报侦察、态势感知等任务时业务的低时延、高可靠、大容量的需求,提出一种新的多信道媒质接入控制协议。该协议采用时延抖动算法并根据信道负载自适应动态调整抖动窗口,利用多信道机制,使协议在有效保障系统稳定吞吐量的同时降低分组接入时延。通过建立分组排队阶段的M/G/1/K模型及信道接入阶段抖动状态的二维马尔科夫链模型,得到任一时隙有分组接入信道的概率,最终推导出分组成功传输概率、端到端时延和系统吞吐量的数学表达式。仿真结果表明,该协议可满足机载自组网传输业务的性能需求,验证了所建模型和理论推导的正确性。

In order to ensure the low delay,high reliability and large capacity of the various types of aircraft in the airborne ad hoc network when performing intelligence reconnaissance and situational awareness tasks,a new multi-channel Medium Access Control(MAC) protocol is proposed.The delay jitter algorithm is used to adaptively adjust the jitter window according to the channel load,and combining with the multi-channel mechanism,the protocol can effectively ensure the stable throughput of the system while reducing the grouping access delay.By establishing the M/G/1/K model of the grouping queuing phase and the two-dimensional Markov chain model of the jitter state of the channel access phase,the probability of having a grouping access channel in any time slot is obtained,and mathematical expression of successful grouping transmission probabilty,end-to-end delay and system throughput are derived.Simulation results show that the protocol can satisfy the performance requirements of the airborne ad hoc network transmission service,and verifies the correctness of the model and theoretical derivation.