Energy-aware call admission control scheme in wireless cellular networks

Traditional call admission control (CAC) schemes focus on only two parameters: call blocking probability and handoff dropping probability, although energy conservation is important and closely related to admission control. In this paper, we present an adaptive CAC to take a third parameter, energy consumption, into account as well. In order to reveal the relationship between CAC and energy consumption, energy consumption rate (ECR) is introduced. Based on a key observation of ECR that the same bandwidth variation of different mobile users may cause different rates of energy consumption, two algorithms are proposed, victim selection algorithm (VSA) and beneficiary selection algorithm (BSA), to reduce energy consumption. The performance of the proposed scheme for a multi-class services model is analyzed, and simulation results demonstrate that the lowest energy consumption is achieved by our scheme with improvement in blocking/dropping probabilities.