Comparisons of channel assignment strategies in cellular mobile telephone systems

Two new channel assignment strategies are proposed. They are the locally optimized dynamic assignment (LODA) strategy and the borrowing with directional channel locking (BDCL) strategy. Their performance is compared with the fixed assignment (FA) strategy (currently used on certain systems) and the borrowing with channel ordering (BCO) strategy (the stability that has given the lowest blocking probability in previous research). Computer simulations on a 49-cell network for both uniform and nonuniform traffic show that the average call-blocking probability of the BDCL strategy is always the lowest. The LODA performance is comparable with BCO under nonuniform traffic conditions but is inferior under uniform traffic conditions