Signal to Insight

 GSM / WCDMA  ·  OSS analysis Networks could look perfectly healthy on OSS dashboards while subscribers kept complaining about dropped calls and poor voice quality. Call setup success rate, overall drop rate, and congestion KPIs stayed comfortably within target. Real users were still experiencing frequent interruptions. The disconnect almost always came down to one thing: aggregation hiding real problems. How averages conceal cell-level failure Performance KPIs were typically calculated and reported as averages at BSC or cluster level. In dense urban environments, a handful of problematic cells could fail repeatedly without moving the needle on the aggregated numbers. Their impact was diluted by volume. From the customer's perspective, those few cells were the only thing that mattered. Example: cluster of 40 cells, BSC-level KPI reporting Call drop rate (cluster average): 1.8% -- within target Call drop rate (worst 3 cells): 12%, 9%, 11% -- far outs...