On the impact of traffic burst on performances of high capacity cellular systems

The effect of unpredictable traffic oscillations (due to traffic jams or accidents for example) occurring in urban areas with heavy road traffic and resulting in unacceptable performances of mobile radio systems are studied. The main goal is to determine whether an improvement in counteracting traffic bursts can be accomplished by means of dynamic channel allocation (DCA), with respect to fixed schemes. The control and management procedures used in the analysis do not represent a proposal for the architecture of the final system. They are very simple, and should be intended only as tools for illustrating the capabilities of DCA strategies. A description of a methodology suitable for evaluating system performances is given. The performance of fixed and dynamic schemes, with uniform spatial traffic distribution by means of a computer simulation program, are compared. A cellular layout based on a hexagonal grid where cell radius is equal to one kilometer is considered