Sorry but to give you what you want requires realy long presentation. Drive testing is a method which allowes you to monitor very large number of parameters of the network. What parameter you will look for is depending on what are your targets. Is it call setup success rate or call setup troubleshooting? Is it HO succ.rate or quality of service? Or maybe interference level, coverage? You see – there are a lot of things. I can answer to your specific question, but to teach you of all this, requires a lot of time and this forum is not the place. Where are you working? Ask for your employers to arrange a training for this!