Hierarchical optimization of microcellular call handoffs

In this paper, we present a novel hierarchical optimization handoff algorithm (HOHA) which has superior performance over the conventional one- and two-threshold handoff algorithms. Our proposed algorithm scans through layers of call handoff options and determines the best candidate based on a heuristic that synchronizes reciprocal handoffs in adjacent cells and maximizes the spare channel capacity in the destination cells. Computer simulation results show that under a unity normalized load condition, the HOHA achieves a gain of about 55% and 11% in the probability of handoff failure as compared to the one- and two-threshold handoff algorithms, respectively. In addition, the total effective load carried is also improved by about 13% and 4%, respectively.