Call admission control schemes in cellular networks: A comparative study

Efficient handoff is an important issue in wireless cellular networks in order to provide Quality of Service (QoS) to the users and to support users´ mobility. A related important issue in the cellular networks is the call admission control (CAC). The design of the call admission control schemes is especially challenging given the limited resources, and the mobility of users encountered in such networks. The goal of this paper is to do performance evaluation of some of the important CAC schemes that are proposed in the literature using simulations and numerical computation of the theoretical results. The CAC schemes studied include Non-Prioritized Scheme (NPS), Guard Channel Scheme (GCS), Fractional Guard Channel Scheme (FGCS), Guard Channel Scheme with Buffer (GCSB), Two-Level Fractional Guard channel Scheme (TLFGCS), Dynamic Guard Channel Scheme (DGCS) and Adaptive Guard Channel Scheme (AGCS). The performance results obtained from simulation of all these schemes are compared and conclusions are drawn.