ADAPTIVE RESOURCE MANAGEMENT WITH FUZZY BANDWIDTH CONTROL FOR MULTI-SERVICES IN TWO-TIER WIRELESS NETWORKS

摘要

In the next generation high-speed wireless networks, one of the most challenging issues is to support multimedia applications with different quality-of-service (QoS) requirements. The triple play (voice, video and high speed data) being transmitted over wireless networks, especially real-time variable bit rate (VBR) traffic, e.g. video, occupies a large amount of bandwidth and is transmitted and received in bursts. Therefore, inefficient bandwidth allocation may lead to under-utilization of network resources. This paper proposes an Adaptive Resource Management Scheme (ARMS) for multimedia services in two-tier wireless communication networks. A virtually adaptive-based resource refund method is presented to adjust the passive capacity dynamically to reduce the blocking probability of real-time calls. Furthermore, a fuzzy bandwidth controller is proposed to adaptively adjust the allocated bandwidth of real-time VBR traffic to improve the system performance. The simulation results show that the proposed scheme further reduces the call blocking and dropping probability for real-time and data calls to enhance the system performance.