Dynamic resource allocation in line-of-sight microcells

Dynamic resource assignment (DRA) is simulated for a ten-cell, ten-channel line-of-sight microcellular environment with Poisson arrivals and exponentially distributed holding times. Propagation effects are evaluated using the discrete ray model proposed by N. Amitay as well as through a simpler model in which power is proportional to the inverse of the distance squared. The findings can be summarized as follows. First, there is no penalty associated with dynamic resource allocation. Performance is slightly better in the absence of multipath fading. Second, power control is necessary to ensure an even distribution of the blocking probability over space. With power control and dynamic resource allocation. Macrodiversity becomes much more effective and the blocking probability for 10 channels is the same as for a fixed allocation scheme with 16 channels. Third, propagation effects have a minimal effect on blocking probabilities for light to normal traffic loads, i.e., when the blocking probability is less than 3%