e operation for optimisation engineers. It includes ex- tracting parameters, analysing them, finding the appropriate new values and implementing them. As many parameters are interdependent, the tuning cycle never ends. After implementation of new values, monitoring takes place through observation of statistics and drive tests. According to the results, other analysis and tunings occur. Network Care Activity Care activity of the network is generally the biggest part of operation costs for an operator. In fact, the roll-out cost is fixed and known; once a site is on air, all operations that occur on this site fall into the category of care activities, even if it is matter of site re-engineering. BTS Hardware Maintenance Operators perform preventive maintenance on the BTS level to keep service quality conforming to certain norms. The idea is to clear hardware problems either by repairing or changing the faulty units. BTS maintenance means a site visit to perform various checks. Hardware faults impact the quality of service. Optimisation engineers through statistics analysis can help to identify hardware problems. The most common problems encountered in the BTS level are classified either in hardware or inconsistency problems. Radio Network Planning and Optimisation Faulty TRX or combiners require change or repair. Sometimes when the BCCH TRX output power becomes weak, a BCCH swap on a healthier TRX improves the quality. Before any unit replacement, it is worth checking the connections at all levels along the antenna line. Another fault management aspect concerns inconsistency. Incoherence of parameters between the BTS database and what normally should be implemented (the software version, for example) requires correction. A branching table, which indicates the position where each timeslot is allocated, may differ from the BTS to the OMC. First level maintenance consists of changing the faulty units on site and then setting up a failure report that describes the encountered problem on the module. The hardware service