A two level control scheme for data traffic in CDMA system

Call admission control schemes play an important role in optimizing channel capacity in CDMA systems and guaranteeing quality of service (QoS) for different users. In this paper, we study the limitations of existing call admission control (CAC) algorithms for voice and data traffic having different delay tolerances. We propose an efficient hierarchical access control scheme to administer call admission as well as channel access at the slot level by exploiting disparity present in delay tolerances of voice and data users. Compared to the existing CAC algorithms, the proposed scheme improves the channel utilization by 5%-20%, depending on the packet arriving rates, for traffic with single packet delay tolerance.