멀티미디어 무선망에서 이동 QoS 위한 지역기반 호수락 제어 = Region-based Call Admission Control for Mobile QoS in Wireless Multimedia Networks

다국어 초록 (Multilingual Abstract)

Previous researches related to call admission control (CAC) in cellular networks Seem to ignore two following factors. One is the possibility of service provisioning in each cell, especially in micro/pico cells. Small-size cells for high-speed wireless multimedia cellular networks increase the hand off rate, and result in rapid and time-varying changes in the network traffic conditions. So, it may be impossible to make service provisioning and provide mobile quality of services (QoS) in the cells with high traffic fluctuation since they may not have converging value of Call Dropping Probability (CDP). The other factor is grade of services (GoS), which is related to the ability to contain calls in networks. In the networks with heterogeneous multi-rate service classes, a broadband call may occupy the same bandwidth as many narrowband calls altogether do. So, we may improve GoS by controlling broadband calls. This paper introduces a novel concept called a region, a logical cell, defined as a minimal set of cells, which enables service provisioning in the mobile traffic conditions. Then, it also proposes a region-based CAC (RCAC), which considers regions rather than cells as service provisioning units, and provides a mechanism to improve GoS in a given call generation environment. Our simulation result shows that RCAC provides much better performance over other mechanisms proposed far m the aspects of both Qos and GoS.