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The paper describes an eecient, versatile and extensible software tool for the analysis of the quality of connectionless services in ATM networks. The tool is named CLASS for ConnectionLess ATM Services Simulator. CLASS is a time-driven, slotted, synchronous simulator, entirely written in standard C language. CLASS allows the performance analysis of ATM(More)
This paper proposes a retrial queueing model with the finite number of sources to evaluate the performance of spectrum renting in mobile cellular networks. The model incorporates necessary ingredients such as the finite number of subscribers, their impatience and a queue for the outbound service. To consider the specific feature of spectrum renting and the(More)
A new queue, referred to here as the HetSigma queue, in the Markovian framework, is proposed in order to model nodes in modern telecommunication networks. The queue has many of the necessary ingredients, such as joint (or individual) Markov modulation of the arrival and service processes, superposition of K CPP (compound Poisson process) streams of(More)
In this paper we introduce the new M/M/1 retrial queue with working vacations which is motivated by the performance analysis of a Media Access Control function in wireless systems. We give a condition for the stability of the model, which has an important impact on setting the retrial rate for such systems. We derive the closed form solution in equilibrium(More)
In this paper, we introduce a retrial queueing problem for wireless cellular networks applying the Fractional Guard Channel (FGC) admission control policy and propose a new algorithm to solve the retrial queue problem involving the FGC policy. Comparison between analytical and simulation results shows that our algorithm is accurate and fast to evaluate the(More)
A new queuing model is proposed for the performance evaluation of the High Speed Downlink Packet Access (HSDPA) protocol, with respect to a specified user, in UMTS networks. The model is based on the recently evolved MM &#931;<i><sup>&#922;</sup><sub>&#954;= </sub>CPP<sub>&#954;</sub>GEcLG</i>-queue<sup>1</sup>, in which the number of servers allocated to a(More)
In this paper the MM K k=1 CP P k /GE/c/L G-queue is introduced and proposed as a generalised Markovian node model in telecommunications networks. An exact and computationally efficient solution is obtained for the steady-state probabilities and performance measures. Issues concerning the computational effort are also discussed. The proposed queue is(More)
In this paper we consider a queueing model extension for a manufacturing cell composed of a machining center and several parallel downstream production stations under a rotation rule. A queueing model is extended with the arrival processes of negative customers to take into account failures of production stations, reorganization of works and disasters in(More)