Hubert Graja

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A novel methodology is proposed for the analysis of the IP packet delay performance of SR-ARQ mechanisms in a generalized wireless system. A simulation model of the system including a novel channel model is described and results are obtained for a range of IP packet size. To demonstrated the efficacy of the methodology, the test scenario is tailored to the(More)
A novel technique for estimating the average delay experienced by an IP packet in cellular data networks with an SR-ARQ loop is presented. This technique uses the following input data: a statistical description of the radio channel, ARQ loop design parameters and the size of a transported IP packet. An analytical model is derived to enable a closed form(More)
The delay characteristics of small IP packets in cellular data networks is investigated through the analysis of the SR-ARQ mechanism. The delay of the radio link controller is taken as the primary delay in the radio access network and all core networking delays are neglected. Results indicate that the average delay may be a misleading measure of system(More)
A simple, effective model of a GPRS/GSM cell is developed that can give a clear insight into the behaviour of MAC layer scheduling algorithms for a definable cohort of users. Users are defined in terms of their QoS class, their mobility characteristics and their traffic characteristics. The channel model is a C/I statistical model that has a variable mean(More)
Abstract: A new, low computation complexity technique for prediction of the average delay of IP packets, transported over cellular data networks with SR-ARQ loop, is presented in this paper. This prediction takes into account the SR-ARQ influence on the average IP packet delay, assuming that the MAC works with a static schedule policy (offering a fixed(More)
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