Abstract The traditional network reliability research generally focuses on the topological connectivity among given nodes based on graph theory. Without considering the relationship between network failures and network performance degradation, traditional network reliability analysis cannot reflect actual network ability reaching up to a certain accomplishment level over a utilization interval. As for the performability analysis of network with specific requirement of transmission time, this paper proposes a dynamic delay-based network reliability evaluation method, which considers network’s ability that transmission delay can be controlled under expected upper limit level in the course of network normal operating period, and puts forward a three-layer network reliability analysis architecture. By integrating a network component reliability model, a network topology model and a network performance model, the dynamic delay-based network reliability model is established, and the network reliability influence factors are integrated into network reliability evaluation. A simple example shows that for a given network, network reliability is different from specified performance requirement. Furthermore, network failures will result in network performance degradation in network long-term operation. It is also proven that network reliability relates not only to network topological connectivity but also to network application environment and specified performance requirement. The key contribution of this paper is to guide network engineers to design a high performance network by optimizing the network parameters according to the delay-based network reliability evaluation method proposed in this paper.

中文翻译：

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一种基于动态延迟的通信网络可靠性评估模型

摘要 传统的网络可靠性研究一般基于图论研究给定节点间的拓扑连通性。如果不考虑网络故障与网络性能下降之间的关系，传统的网络可靠性分析无法反映在一个利用区间内达到一定完成水平的实际网络能力。针对对传输时间有特定要求的网络的性能分析，提出了一种基于动态延迟的网络可靠性评估方法，该方法考虑了网络在网络正常运行期间传输延迟可以控制在预期上限水平下的能力。 ，并提出了三层网络可靠性分析架构。通过集成网络组件可靠性模型，建立网络拓扑模型和网络性能模型，建立基于动态延迟的网络可靠性模型，将网络可靠性影响因素纳入网络可靠性评估中。一个简单的例子表明，对于给定的网络，网络可靠性不同于指定的性能要求。此外，网络故障会导致网络长期运行中的网络性能下降。还证明网络可靠性不仅与网络拓扑连通性有关，还与网络应用环境和规定的性能要求有关。