Analysis of Finite Population Limited Fractional Guard Channel Call Admission Scheme in Cellular Networks

Abstract

In this paper, we consider a Call Admission Control (CAC) protocol which meets the challenge to support the guarantees of Quality of Service (QoS). The finite population limited fractional guard channel (FPLFGC) policy is derived which allows the reservation of a real number of channels rather than an integer number of channels. It reduces the new call blocking probability, increases the channel utilization and keeps the handoff call dropping probability almost unchanged. The analytical model is used to investigate the impacts of the threshold for managing the new call blocking and handoff dropping probabilities. Numerical results are included to illustrate the effectiveness of the proposed model. These results clearly demonstrate that different threshold settings can provide different tradeoffs between dropping and blocking probabilities to suit different network service requirements. The proposed policy is shown to be more effective than the finite population guard channel (FPGC) policy in minimizing blocking probability of new calls and the number of needed channels while holding the constraint on dropping probability of handoff calls.