Authors : Hyuncheol Kim , Sungkee Noh , Sungjin Ahn and Jinwook Chung
Abstract: In spite of the intrinsic scarcity of wireless bandwidth, mobile networks must have an ability to maintain an acceptable level of service to provide diverse Quality of Service (QoS) while achieving efficient bandwidth utilization. In the wireless mobile network, handoff dropping probability and Call Blocking Probability (CBP) are some of the main issues for satisfying the QoS requirements. Traditional admission control schemes seeking to control handoff dropping probability and to optimize network utilization without any consideration of fair allocation and multimedia call characteristics, incurring serious unfairness and unbalance inevitably. This study proposes a combined Call Admission Control (CAC) and bandwidth allocation scheme that guarantees the time independent fairness and fault tolerance in the heterogeneous mobile communication services. To make this possible, we propose a DBNP (Double Buffer without Preemption) model that can classify connection requests to the first buffer by using the call identifier. It will hold some calls in the second buffer rather than directly discarding it when the residual bandwidth is insufficient. A multimedia call that satisfies all connection requirements has precedence over other calls. We also have developed an analytical model and performed analysis for the DBNP in terms of two performance factors: bandwidth allocation fairness and resource occupancy. By numerical analysis, we demonstrate that the DBNP scheme actually achieves call blocking probability fairness for multimedia calls and improve resource utilization.
Hyuncheol Kim , Sungkee Noh , Sungjin Ahn and Jinwook Chung , 2005. Analysis of Combined Bandwidth Allocation and Call Admission Control in High-speed Mobile Networks . Asian Journal of Information Technology, 4: 751-757.