Alagu S and Meyyappan T, Alagappa University, India

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 handoff blocking rate measured in the past certain period of time. The handoff 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. The result shows that the DCAS scheme outperforms the Static Channel Allocation Scheme by controlling a hard constraint on the handoff rejection probability. The proposed scheme achieves the optimal performance by maximizing the resource utilization and adapts itself to changing traffic conditions automatically.

Handoff, Guard Channel, Dynamic Channel, Fixed Channel, DCAS, Spectrum