Hamid Beigy - Computer Engineering Department Amirkabir University of Technology Tehran, Iran
Meybodi - Computer Engineering Department Amirkabir University of Technology Tehran, Iran

In this paper, we introduce a two threshold guard channel scheme, which maintains predefined upper bounds on the dropping probalities of both handoff transaction and handoff voice calls in mobile transaction environments. The proposed call admission scheme minimizes the blocking probility of both types of new calls subject to the hard constraint on the dropping probabilities of handoff transaction calls and handoff voice calls. The limiting behavior of the proposed scheme policy is analyzed under the stationary traffic. In this paper, we also introduce an algorithm, which minimizes the channel requirement of a cell subject to the all hard constraints on the quality of service of calls. The two-threshold guard channel scheme can easily be extended to multi-classes traffic.