Reliability and performance modelling of VoIP system with multiple component failures

Abstract

Nowadays Voice over IP (VoIP) has become an evolutionary technology in telecommunications. Because of the increasing dependencies of people on VoIP for voice communication, it is important to design a reliable and performance oriented VoIP system. In this paper a hierarchical model combining reliability and performance is proposed for a server based VoIP system on a wireless network. The top level reliability model consists of only the basic components of a VoIP system. Simultaneous failure of multiple components is taken into modelling consideration. Component redundancies and software rejuvenation are employed to achieve higher system reliability. Assuming exponential failure and repair times of the components, continuous time Markov chain is used to develop the top level reliability model. In addition, a lower level performance model is constructed to obtain the performance metrics of the system at each state of the top level reliability model. Numerical results are provided for the quantitative analysis of the proposed model.Reference to this paper should be made as follows: Gupta, V. and Dharmaraja, S. (2013) 'Reliability and performance modelling of VoIP system with multiple component failures', Int.

Service disruption index (SDI): A novel user perspective reliability indicator for modern virtual service networks

“…Some approaches use a specific SLA as the reliability index for a particular service, which is not compatible with another service. For instance, the work of Gupta and Dharmaraja is intended for a VoIP network and the work of Biernacki and Tutschku is targeted for video streaming network.…”

“…There are various service‐oriented metrics used for service network reliability: end‐to‐end grade of the service, the number of successful VoIP calls, the network operator revenue, etc. In Gupta and Dharmaraja, reliability for a VoIP service network is analyzed by evaluating the number of multiple paths with minimum delay constraint between the specified node pairs inside the network.…”

An Optimal Rejuvenation Strategy for Increasing Service Reliability of a VOIP System with Multiple Components

“…In order to obtain the optimal rejuvenation strategy, system MTTF is maximized subject to a constraint about the time that is spent at the rejuvenation mode. This paper is an extended version of our work published in Gupta and Dharmaraja (2013). In Gupta and Dharmaraja (2013), we incorporated component redundancies to increase system reliability, and also dealt with the simultaneous failure of more than one component.…”

“…This paper is an extended version of our work published in Gupta and Dharmaraja (2013). In Gupta and Dharmaraja (2013), we incorporated component redundancies to increase system reliability, and also dealt with the simultaneous failure of more than one component. In this paper, we extend our previous work by proposing an optimal software rejuvenation strategy which further contributes to improved system reliability.…”