 to which the whole process may vary from place to place. The site selection process lays the foundation pillars of an entire network. Mediocre site selection leads to all kinds of troubles during the network launch and even more during the expansion phases. Collapse of even one site can lead to an ugly hole in a beautifully designed network. Site selection is based on some main criteria, which are classified in Figure A.1. Subscriber Base Potential The whole cellular business is based on subscriber and revenue generation. An adequate survey is done to identify the potential subscriber base and their needs, habits and lifestyles, which play a major role in generating average revenue per user (ARPU). Market survey departments provide inputs like the number of potential subscribers, density of users, hot spots, hubs, traffic flow, major junctions, commercial centres and offices, residential concentrations, busy roads, etc. The operator's marketing section always prefer the best coverage of all dwelling areas, including in buildings and on road coverage. Financial teams cannot permit such a generous layout of equipment. Hence the operator needs to come up with an optimal plan, deciding on the number of sites per city or town based on the subscriber base, coverage requirement and expected revenue. During the optimisation stages, they have to allocate resources in terms of finances and equipment to support in-building coverage in underground areas such as Metro stations, tunnels, subways and other basement areas in commercial areas with adequate levels of human density. Figure A.2 gives Network Implementation Groups Population Spending Density Pattern Average Income Figure A.2 Factors defining a demographic area a brief idea of some factors that are chosen when selecting a demographic area for launching a radio network. RF Engineering An ideal philosophy would be to provide good coverage everywhere. That will not justify the cost of sites in relation to the subscriber base or future revenue forecasts. Signal level req