Performance analysis of voice over internet protocol via non Markovian loss system with preemptive priority and server break down

摘要

Voice over Internet Protocol (VoIP) or Internet telephony has become an evolutionary and promising technology in the area of telecommunications. Lower costs and simpler maintenance are the major reasons of its increasing popularity. However, the network is inherently unreliable and highly challenged when it comes to quality of service (QoS). The VoIP system is primarily a multi-server system which may also face failures. Hence, in order to study the performance of VoIP, it is proposed to develop a multi-server, loss system with general service times, server breakdown and repair together with preemptive priority queuing discipline, for two types of customers: high priority and low priority. The customers are served immediately if the server is available. However, if all servers are busy, then on the arrival of a high priority customer, the service of a low priority customer is preempted. The steady state distribution of such underlying system is obtained together with the performance measures. A numerical illustration of the obtained results is also presented graphically. The results are validated using simulation.