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Log Lab intermediate 30 min4 graded questions
NR Dropped Calls — gNB Log Investigation
Cell gNB-MET-042-N1 saw an 18% spike in dropped calls over 2 hours (7% vs 0.4% baseline). Find the pattern in 2h of gNB logs and pin down the root cause.
Scenario
In the last 2 hours, cluster Metro-North-7 saw an 18% spike in dropped calls on cell gNB-MET-042-N1. Normal drop rate is 0.4%, you're seeing 7%. Ops has escalated to RAN engineering.
You've pulled 2 hours of DEBUG+INFO+WARN+ERROR logs from this gNB. Your task: find the pattern, identify the root cause, and recommend a fix. Tip: start by filtering for severity:WARN,ERROR — then correlate the timestamps with the routine measurement reports around them.
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