WALFISH-IKEGAMI (WI) Region 1 Region GENERAL Roads width (m): Road orientation angle (degrees): Building separation (m): Buildings average height (m): INDOOR COVERAGE Region 1 Region GENERAL Propagation Model Slow Fading Margin + BPL (dB): Coverage Threshold (dBuV/m): Coverage Threshold (dBm): -58.6 -63.6 -68.6 Location Probability over Cell Area(L%): 95.0% 95.0% 95.0% Cell Range (km): OUTDOOR COVERAGE GENERAL Propagation Model Slow Fading Margin (dB): Coverage Threshold (dBuV/m): Coverage Threshold (dBm): Location Probability over Cell Area(L%): 95.0% Cell Range (km): RADIO NETWORK DETAILED PLANNING 2.4.5 Capacity Planning Capacity planning is a very important process in the network rollout as it defines the number of base stations required and their respective capacities. Capacity plans are made in the pre- planning phase for initial estimations, as well as later in a detailed manner. The number of base stations required in an area comes from the coverage planning, and the number of transceivers required is derived from capacity planning as it is directly associated with the frequency re-use factor. The frequency re-use factor is defined as the number of base stations that can be implemented before the frequency can be re-used. An example of frequency re-use is shown in Figure 2.12. The maximum number of frequencies in a GSM 900 system is 125 in both the uplink and downlink directions. Each of these frequencies is called a channel. This means that there are 125 channels available in both directions. The minimum frequency re-use factor calculation is based on the C/I ratio. As soon as the C/I ratio decreases, the signal strength starts deteriorating, thereby reducing the frequency re-use factor. Another factor to keep in mind is the antenna height at the base station. If the antenna height is too high then the signal has to travel a greater distance, so the probability that the signal causes interference becomes greater. The average antenna height should be such that the number of base stations (fully utilised i