基于排队论的UAVS通信网切换方案分析

针对UAVS通信网切换管理中的信道分配问题,提出了保护切换信道与切换呼叫按照先入先出队列排队相结合的方案(GCM-FIFO),利用Markov链对该方案进行了建模,通过数学推导分析了系统的性能,并就等待队列容量对切换性能的影响进行了讨论和仿真.结果表明:通过实施GCM-FIFO方案,UAVS通信网获得了较好的切换性能,而且随着队列容量的增加,切换呼叫失败的概率呈下降趋势,但是当队列容量超过某个值后,切换呼叫失败的概率趋于恒定,因而应根据系统相关参数,利用仿真结果选择合适的队列容量.

Survey on a Queue Theory Based Handover Scheme for UAVS Communication Network

The guard channel scheme with first-in-first-out(GCM-FIFO)is proposed for the handover management in UAVS communication and telecontrol network for the first time.We use Markov-chain method to model the GCM-FIFO channel allocation scheme,analyze the performance of the scheme via mathematical deriving,and discuss the handover performance as functions of the capacity of queue.Results show that handover performance of GCM-FIFO is much better than pure GCM scheme,and the handover failure probability falls,as the capacity of queue increases.What's more,the handover failure probability becomes nearly unchanged after the capacity of the queue exceeds some value.So the capacity of the queue for handoff calls should be properly chosen according to the simulation result of system.