UE LOGS & TROUBLESHOOTING

Log analysis: a practical engineering method

Log analysis is not just searching for an error message. The goal is to reconstruct what the device and network were trying to do, identify where the expected sequence changed and then isolate the failing layer.

Start with a question

Define the symptom first: registration failure, call drop, throughput issue, handover failure, data-session problem or device certification issue. A precise question keeps the analysis focused.

Build a timeline

Align timestamps across UE logs, protocol traces and network events. Find the first unexpected event rather than the last visible error.

Follow the layers

Move through L1, L2, RRC, NAS, core signalling and application/service layers as needed. The first layer that breaks the expected sequence is usually more useful than downstream errors.

Tools and evidence

Depending on the investigation, useful evidence can include UE modem logs, QXDM captures, Wireshark traces, XCAL-M measurements, network-side traces and device test results.

Failure isolation

Separate radio, protocol, configuration, network, device and interoperability causes. Reproduce when possible and compare a failing trace with a known-good trace.

Open for future case studies

This section is intentionally structured for future updates. New real-world cases can be added without changing the overall knowledge-base design.