2.2.1 Reuse Distance and Cell Patterns

In the FCA strategy, the area of service is partitioned into a number of cells and the same number of channels is permanently assigned to each cell according to a reuse pattern [7]. These channels are called nominal channels. The same set of channels can be reused in another cell provided that the reuse distance D is fulfilled [7]. The reuse distance is the minimum separation of identical channelsthat have the same carrier frequency, at which there is acceptable interference (CIR)

where R is the cell radii and N is the reuse pattern. So if we consider the total number of channels available in the system to be M, the set of channels given to each cell, S, is easily found by with N can assume only integer values 1, 3, 4, 7, 9, 12, as generally presented by the series ( i + j) ² - ij, where i and j are integers [7 9]. It is obvious that the shorter the channel reuse distance, the greater the channel reuse over the whole service area. Figures 2.1 (a, b) show the allocation of channel sets to cells for N =...