Lab: End-to-end troubleshooting challenge (timed, 5 scenarios)

Five Troubleshooting Scenarios

This capstone lab presents 5 independent troubleshooting scenarios with symptoms, KPI data, topology, and relevant traces. Scenario 1: 500 subscribers in one tracking area suddenly cannot register since 09:15 — 100% NAS Registration Reject with cause #15 while all other TAs work fine. Scenario 2: Cell X Sector 2 throughput dropped from 400 Mbps to 120 Mbps with unchanged SINR (mean 16 dB) but PRB utilization jumped from 40% to 78% — no parameter changes were made. Scenario 3: A road segment shows 15 RLFs per day concentrated during 07:00-09:00 and 17:00-19:00 rush hours with RSRP -95 dBm and…