Efficiency comparison of channel allocation schemes for digital mobile communication networks

This paper provides network designers and operators with simple guidelines on traffic measurements and efficiency evaluation of various channel allocation schemes in digital mobile telecommunications networks. The paper evaluates the efficiency obtained by implementing the following channel allocation schemes: 1) fixed uniform channel allocation (FUCA); 2) fixed nonuniform channel allocation (FNCA); 3) dynamic channel allocation (DCA) where the number of frequency carriers is adaptive and dependent on the load; and 4) dynamic frequency/time channel allocation (DFTCA) (a new scheme which is the most efficient) where the number of channels is adaptive (based on the load), allowing two channels of the same frequency carrier to be used in two neighboring cells. The analysis is based on standard queuing models under the following assumptions: 1) Poisson call arrivals in each cell; 2) exponential call holding time; 3) exponential mobile travel time; and 4) exponential sojourn time of a mobile in a cell. Numerical results are presented to provide insight into accuracy of the models and efficiency gain by dynamic frequency time channel allocation under different traffic conditions (including conditions related to highway traffic).