In this paper, using a simulation and modelling technique, the sensitivity of other-cells interference factor and the probability of blockage versus the addition of the various tiers of neighbouring cells has been studied. Situations with tiers of neighbouring cells are considered and for two scenarios, when the mobile chooses as home cell the nearest base station, and when it compares two base stations and chooses the base station with the stronger signal. It is concluded that it is usually enough to consider only three tiers of neighbouring cells to get a good understanding of the performance issues of the CDMA home cell. The simulation results confirm that by choosing the better of two base stations a significant reduction in other-cells interference can be achieved compared to choosing the closest base station. The other-cells interference factor is found and compared with the upper bound results obtained in earlier studies.
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