基于优先级服务的两级轮询系统性能分析

摘要

针对宽带无线接入网络系统中信息分组传输控制实时性和公平性要求,提出了由1个中心站点和N个普通站点构建一种新的基于优先级服务的两级轮询系统模型,采用完全和限定(K=1)相组合的混合服务策略,利用嵌入Markov链和概率母函数方法,在离散时间状态下建立系统分析模型,精确解析系统特性参数,并通过计算机仿真实验进行验证.结果表明,该模型在信息分组传输控制实时性和公平性要求等方面具有较好的控制性能.%Considering the real time transmission and impartial service of information packets for Broadband Wireless Access(BWA) network systems,a novel and efficient model of two-level-polling system based on priority service was presented.The system consisted of a hub station and N common stations, providing exhaustive service and limited service ( K = 1) in discrete time respectively.By the embedded Markov chain theory and the probability generating function methodology, the closed form expressions for obtaining the characteristic parameters of the system were given, and the analytical results verified by extensive computer simulations.The performance results reveal that this new scheme has high performance in better impartiality and real time transmission of information packets for BWA.