The Geometric Dynamic Channel Allocation strategy for high traffic FDM/TDMA Mobile Communications Networks

In this paper we refer to a specific class of traffic adaptive Dynamic Channel Allocation (DCA) strategies, namely the conservative interference-free, timid, not conditioned class. In this framework we present a new DCA strategy, the so-called Geometric DCA (GDCA) strategy. The main feature of the GDCA lies in its ability to organize the dynamic resource assignment so that the resulting carrier usage pattern resembles that corresponding to a Fixed Channel Allocation (FCA), as long as that is compatible with the offered traffic pattern. A performance evaluation has been carried out with an user mobility model accounting for the large fluctuations of the number of users in a cell coverage area expected in a microcellular environment. Although GDCA requires a minimum knowledge about carrier utilization in neighbouring cells, the performance comparison in the considered scenario shows better results than other proposed DCA strategies. Moreover a conflict free algorithm for carrier acquisition (Synchronized Carrier Acquisition), which copes with the nonnull propagation time required by the information exchange between neighbouring cells, is proposed.