认知无线网络中的改进Erlang丢失系统
Modified Erlang loss system for cognitive wireless networks
摘要：
本文考虑了一种改进的Erlang丢失系统的认知无线网络和相关应用。一个主要用户具有优先于次要用户的抢占式优先权，如果在到达时所有信道都被其他主要用户使用，则主要客户丢失。次级用户认知地使用空闲信道，并且在空闲信道在到达时不可用或者它们被初级用户中断的情况下，它们可以在无限缓冲区处等待。对于主用户和次用户的到达过程服从Poisson过程且服务时间服从两个不同的任意分布的情况，我们得到了系统稳定性的显式条件.稳定性条件是不敏感的服务时间分布，并意味着最大的通过次用户。对于指数服务时间分布的特殊情况，我们深入分析了参数对延迟性能和次用户的平均中断次数的影响。我们的模拟分布，而不是指数显示，次要用户的平均终止数是不太敏感的主要用户的服务时间分布。
英文摘要：
This paper considers a modified Erlang loss system for cognitive wireless networks and related applications. A primary user has preemptive priority over secondary users and the primary customer is lost if upon arrival all the channels are used by other primary users. Secondary users cognitively use idle channels and they can wait at an infinite buffer in cases idle channels are not available upon arrival or they are interrupted by primary users. We obtain explicit stability condition for the cases where arrival processes of primary users and secondary users follow Poisson processes and their service times follow two distinct arbitrary distributions. The stability condition is insensitive to the service time distributions and implies the maximal throughout of secondary users. For a special case of exponential service time distributions, we analyze in depth to show the effect of parameters on the delay performance and the mean number of interruptions of secondary users. Our simulations for distributions rather than exponential reveal that the mean number of terminations for secondary users is less sensitive to the service time distribution of primary users.
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