Isolate the RF fault before tuning
When a mobile service degrades, separate radio, transport, and core issues before you start changing parameters.
A weak service complaint is not a single problem. It can be coverage, interference, backhaul congestion, core signalling, or a bad customer profile. If you tune the network before isolating the layer, you usually make the wrong thing faster.
Start with evidence from the edge inward: signal quality, retries, handover failures, transport latency, then core session setup. Each layer either clears itself or hands the fault to the next layer. That sequence saves you from random parameter tweaks that only hide the symptom.
Good telecom troubleshooting asks one question first: where does the problem first appear? Once that point is known, the fix is usually obvious, or at least no longer mystical.