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Semi-Markov modeling of dependability of VoIP network in the presence of resource degradation and security attacks

机译：存在资源退化和安全攻击时VoIP网络可靠性的半马尔可夫建模

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摘要

Nowadays VoIP has become an evolutionary technology in telecommunications. Hence it is very important to study and enhance its dependability attributes. In this paper, an analytical dependability model for VoIP is proposed. The study is focused on analyzing the combined effects of resource degradation and security breaches on the Quality of Service (QpS) of VoIP, to enhance its overall dependability. As a preventive maintenance policy to prevent or postpone software failures which cause resource degradation, software rejuvenation is adopted. The dependability model is analyzed using semi-Markov process which captures the effects of non-Markovian nature of the time spent at various states of the system. The steady-state as well as the time-dependent analysis of the dependability model is presented. The steady-state results are obtained analytically, whereas the time-dependent results are obtained from simulation. Also, the analytical model is validated via simulation. The model analysis using a numerical example indicates the feasibility of our approach. Various dependability attributes such as availability, reliability and confidentiality are also obtained. A comparative study is also done between our proposed model and the existing models.
机译：如今，VoIP已成为电信中的一种演进技术。因此，研究和增强其可靠性属性非常重要。本文提出了一种VoIP的分析可靠性模型。这项研究的重点是分析资源退化和安全漏洞对VoIP服务质量（QpS）的综合影响，以增强其总体可靠性。作为防止或推迟导致资源退化的软件故障的预防性维护策略，采用了软件复兴。使用半马尔可夫过程分析了可靠性模型，该过程捕获了在系统各种状态下花费的时间的非马尔可夫性质的影响。提出了可靠性模型的稳态和时间相关性分析。可以通过分析获得稳态结果，而通过仿真获得随时间变化的结果。同样，分析模型通过仿真验证。使用数值示例进行的模型分析表明了我们方法的可行性。还获得了各种可靠性属性，例如可用性，可靠性和机密性。我们提出的模型与现有模型之间也进行了比较研究。

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