论文标题
关于具有智能网关多样性的卫星网络中停电概率的计算和近似
On the Computation and Approximation of Outage Probability in Satellite Networks with Smart Gateway Diversity
论文作者
论文摘要
极高频率（EHF）频段的利用可以在卫星网络（SATNET）中获得很高的吞吐量。然而，EHF乐队的严重降雨衰减对系统的可用性施加了严格的限制。智能网关多样性（SGD）被认为是必不可少的，以保证以合理的成本保证所需的可用性。在这种情况下，我们检查了一个分享负载的SGD（LS-SGD）体系结构，该体系结构最近在文献中提出。对于这种多样性方案，我们使用基于Poisson二项式分布（PBD）的严格概率分析来定义系统中断概率（SOP），并考虑到交通需求以及网关（GW）容量。此外，我们为SOP的精确计算提供了几种方法。涉及SOP的确切计算，给出了基于递归公式的闭合形式表达和有效的算法，这两者在GWS数量中都具有二次最坏情况的复杂性。最后，提出的近似方法包括众所周知的概率分布（二项式，泊松，正常）和Chernoff结合。根据数值结果，二项式和泊松分布是迄今为止最准确的近似方法。
The utilization of extremely high frequency (EHF) bands can achieve very high throughput in satellite networks (SatNets). Nevertheless, the severe rain attenuation at EHF bands imposes strict limitations on the system availability. Smart gateway diversity (SGD) is considered indispensable in order to guarantee the required availability with reasonable cost. In this context, we examine a load-sharing SGD (LS-SGD) architecture, which has been recently proposed in the literature. For this diversity scheme, we define the system outage probability (SOP) using a rigorous probabilistic analysis based on the Poisson binomial distribution (PBD), and taking into consideration the traffic demand as well as the gateway (GW) capacity. Furthermore, we provide several methods for the exact and approximate calculation of SOP. As concerns the exact computation of SOP, a closed-form expression and an efficient algorithm based on a recursive formula are given, both with quadratic worst-case complexity in the number of GWs. Finally, the proposed approximation methods include well-known probability distributions (binomial, Poisson, normal) and a Chernoff bound. According to the numerical results, binomial and Poisson distributions are by far the most accurate approximation methods.
