Vol: 58(72) No: 2 / June 2013        

Modeling the RF Communication in Sensor Networks by using Finite-Source Retrial Queueing System
Tamás Bérczes
Faculty of Informatics, University of Debrecen, 4028 Debrecen, Kassai út 26., Hungary, phone: (36) 52-512900, e-mail: berczes.tamas@inf.unideb.hu
Béla Almási
Faculty of Informatics, University of Debrecen, 4028 Debrecen, Kassai út 26., Hungary, e-mail: almasi.bela@inf.unideb.hu
János Sztrik
Faculty of Informatics, University of Debrecen, 4028 Debrecen, Kassai út 26., Hungary, e-mail: sztrik.janos@inf.unideb.hu
Attila Kuki
Faculty of Informatics, University of Debrecen, 4028 Debrecen, Kassai út 26., Hungary, e-mail: kuki@inf.unideb.hu


Keywords: wireless sensors, performance evaluation, retrial queueing, stochastic simulation

Abstract
In this paper we study the radio frequency (RF) transmission in wireless sensor networks. A new finite source retrial queueing model is introduced in order to calculate the most important system performance characteristics (e.g. mean waiting time, mean number of requests waiting for transmission). The sensors form the \"sources\" and the RF unit represents the \"service station\" of the queueing model. The sensors are classified according to their working purposes: The first class is the \"Emergency\" class, which is responsible to notify special emergency situations (e.g. fire alarms). The second class is the \"Standard\" class, which performs the measurement of standard environmental data (e.g. humidity, temperature). The RF unit may enter into energy saving (or \"sleeping\") working mode in order to spare energy and have longer battery life. The RF communication is stopped in the sleeping mode. Concerning the \"wake up\" mechanism from the energy saving mode we differentiate two cases and create two models to compare their steady-state system performance measures: In the first model the RF transmission possibility will be available randomly for the sensor nodes (Non Controlled case). In the second model the RF transmission requests coming from the emergency class, will access the wireless channel immediately (Controlled case).

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