Zonoozi, Mahmood Mohseni (1997) Handover in digital cellular mobile communication systems. PhD thesis, Victoria University of Technology.

Abstract

A mathematical formulation is developed for systematic tracking of the random movement of a mobile station in a cellular environment. It incorporates mobility parameters under generalized conditions, so that the model could be tailored to be applicable in most cellular environments. This model is then used to characterisendifferent mobility-related traffic parameters in a cellular system. These include the cell residence time of both new and handover calls, channel holding time and the average number of handovers per call. It is shown that the cell residence time can be described by the generalized gamma distribution, while the channel holding time can be best approximated by the negative exponential distribution. Based on these findings a teletraffic model that takes the user mobility into account is presented and is substantiated using a computer simulation. Further, the influence of cell size on new and handover call blocking probabilities is examined. The effect of the handover channel reservation on call dropout probability is also examined to determine the optimum number of reserved channels required for handover. Improvement to handover performance is investigated in terms of reduction in the number of unnecessary handovers as well as reduction in handover delay time. For this purpose an analytical method is developed which determines the optimum hysteresis level and the signal averaging time under shadow fading. The results are applicable in both micro- and macro-cellular systems.

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