Performance comparison of global and distributed dynamic channel allocation algorithms

Previous work has shown that DCA offers a gain in system performance by adapting channel reuse to both the traffic and interfering environment. In this paper a third form of adaptation (location adaptation) is proposed and analysis is used to predict the potential gain this would provide. A simulation tool is used to investigate the performance of some DCA schemes with reference to the calculated potential gain. Two simple distributed algorithms are compared with a computationally intensive global DCA method. The simulation results suggest that if channel reassignment is used when call quality drops below an acceptable level, certain distributed DCA schemes may outperform global techniques. The results show how the reassignment process organises the system towards an optimised situation but that some form of additional interference adaptation is required to achieve the optimum