Abstract: A location-based system detects anomalies in performance indicators of telecommunication networks. The system generates a plurality of service areas, each service area including a plurality of adjacent cell sites. A performance indicator of a first service area of the plurality of service areas is selected and an aggregated service area performance indicator is generated, by aggregating the selected performance indicator for each cell site of the plurality of cell sites of the first service area. Generation of the plurality of service areas may be related to a determined network traffic threshold. The threshold may be related to: total bandwidth provided by a cell site, or total number of calls handled by a cell site. The selected indicator may be, for example the call set-up success rate (CSSR), or the drop call rate (DCR). An alert related to the aggregated indicator may be generated.