g team to provide the expected traffic increase rate in order to estimate the target traffic that will be carried out by each cell in the mid-term plans. Site Survey A site survey may be needed, especially for sites that are candidates for the expansion phase. Imple- mentation teams check whether the addition of new equipment is possible (enough space, no extra load on the building foundations, energy requirements, site access, etc.). At the same time, transmission link Radio Network Planning and Optimisation capacity, real TRX configuration and alarms are checked in order to constitute a clean database and plan logistics requirements. Site Follow-up Optimisation engineers deal with frequency preparation and KPI follow-up. It is their responsibility to check that the operation is transparent to network performance except for a positive impact on TCH blocking. Here, an important effect shoud be mentioned: some TRX extension/dismantling configurations generate a transmitting power increase or decrease depending on the BTS configuration (number of combining floors). This can explain some strange behaviour, such as a traffic increase after dismantling some TRXs. New Features Introduction What is interesting about optimisation is that it implicitly contains at the same time optimisation activities (for already running sites) and some planning activities (introduction of new sites, BSCs, features, etc.). New features are designed to boost network performance. Prior to the wide introduction of a new feature, operators generally want to test it beforehand SO as not to generate any disturbance on the offered service. A trial or the more commonly used RSV (Regular Service Validation) procedure allows validation or the introduction of the new feature in the entire network. RSV mainly consists of the following steps: documentation on the hardware/software requirements of the feature; choice of a suitable area for testing; constitution of a reference, with drive tests and KPIs chosen according to what is relevant for the asse