A microcellular DCA scheme using variable channel exclusion zones

We propose a new DCA algorithm to provide service to slow- and fast-moving users in an all-microcells network, that achieves lower average number of handovers (actual channel changes) than the average number of cell crossings per call. The algorithm selects a channel that is not currently in use within an area surrounding the initial cell, so the terminal does not need to change to a new communication channel when it reaches a new cell. The algorithm is presented in the context of a radio-fibre structure with centralised control in which a call handover becomes simply a radio port selection at the controller. The performance of the proposed algorithm is computed through network simulations in a Manhattan street environment under uniform traffic, and compared to FCA and DCA first available algorithms