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The rapid growth in the demand for mobile communications has led to an intense research effort to achieve an efficient use of the scarce spectrum allocated for cellular communications. In this paper, the authors devise a new scheme DCAS (Dynamic Channel Allocation Scheme) for call admission control. In this new scheme, the number of guard channel(s) is adjusted automatically based on the average hand-off blocking rate measured in the past certain period of time. The hand-off blocking rate is controlled under the designated threshold and the new call blocking rate is minimized. The performance evaluation of the DCAS is done through simulation of nodes.
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