Event analysis: handover, RLF, RACH failure, NAS reject

Network Events in Drive Test Data

Drive test logs capture network events that reveal mobility and connectivity problems. Handover events track cell transitions — successful handovers show smooth PCI changes with minimal interruption, while handover failures cause brief data gaps or worse. Radio Link Failures (RLFs) occur when the UE loses its radio connection, triggered by SINR degrading below Qout threshold for T310 duration. Each RLF causes 1–3 seconds of service interruption as the UE reestablishes the connection. RACH (Random Access Channel) failures indicate access problems — the UE cannot establish or reestablish a…