Ram Chakka

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Chakka, R. and I. Mitrani, Heterogeneous multiprocessor systems with breakdowns: A model of a system with N parallel processors subject to occasional interruptions of service, and a common unbounded queue fed by a Poisson arrival stream, is analyzed in the steady state. The service, breakdown and repair characteristics may vary from processor to processor.(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)
1 Extended abstract Consider a system parallel processors where ~ identical serve a common? unbounded job queue. The processors break down from time to time, and return to an operative state after being repaired. When operative, each processor serves jobs, one ZJt a time, and each job is allowed to occupy at most one operative processor at a time. Let I(t)(More)
Spectrum renting is an operation practice that can be applied to relieve the temporary capacity shortages of a specific service area in wireless cellular networks. However, works in the literature do not take into account the specific feature of the present wireless technology. That is, the separate blocks of user channels are defined in each frequency band(More)