Especially in urban and dense urban cellular network topologies, the possibility to shut down cells or whole base stations has been estimated in terms of feasibility (i.e. no coverage holes are allowed) and energy saving potential [9], [5]. [6], [10]. UMTS cellular network planning in urban scenarios is capacity-driven and focused on peak-hour traffic volumes. Therefore many UMTS base stations with low intersite distances are installed. The sector antenna downtilt angles for single cells are adjusted to minimize inter-cell interference and to cope with cell breathing effects [11], [12], [13]. Lowering the downtilt angle of a sector antenna results in an increasing cell coverage area and can lead to overlapping coverage areas with other cells. Optimizing the process of downtiit angle adaptation in low traffic scenarios may lead to redundant cells i.e. these cells can be shut down without negative effect on the network coverage