Adaptive Admission Control with Inter-Cell Fairness in QoS-Sensitive Wireless Multimedia Networks

An important Quality-of-Service (QoS) issue in wireless multimedia networks is how to control handoff drops. In this paper, we propose admission control algorithms that adaptively control the admission threshold in each cell, in order to keep the handoff dropping probability below a pre-defined level. The admission threshold is dynamically adjusted based on handoff dropping events. We first present a simple admission control scheme which brings out an important performance evaluation criterion—intercell fairness—and serves as a reference point. We then investigate the inter-cell unfairness problem and develop two enhanced schemes to overcome this problem. The performance of these protocols is benchmarked and compared with other competitive schemes. The results indicate that our schemes perform very well while, in addition, achieving significantly reduced complexity and signaling load. Keywords— Handoff, probabilistic QoS guarantee, intercell unfairness, adaptive control