Interference performance is among the most important issues especially in WCDMA cellular networks planning coverage and capacity. F-factor has been introduced in previous works to model the interference in WCDMA downlink dimensioning process. In this paper, we establish its PDF expression assuming one interferer in the serving cell both with and without correlated shadowing effect. Uniform and non-uniform traffic situations are distinguished through the study of both uniform and non-uniform

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... and non-uniform traffic load cases. Then, we generalize the expression for multiple interfering cell tiers. We show the impact of this evaluation on the design process in order to increase the capacity of a network.