Design and Performance Analysis of MAC Protocols for QOS Guarantee in Broadband Wireless Access Networks
저자
발행사항
서울 : Graduate School Korea University, 2003
학위논문사항
Thesis(doctoral)-- Graduate School Korea University: Department of Communication System Technology 2003. 8
발행연도
2003
작성언어
영어
주제어
KDC
559.456 판사항(4)
형태사항
ⅹⅶ, 186p. : ill. ; 26cm.
일반주기명
References: p. 167-182
소장기관
The rising demand for multimedia multiservice to the end users, and the ability of wireless technology to eliminate the need for local exchange carrier involvement in the provisioning and installation of broadband access are two major drivers behind the current popularity and long-term market potential of broadband wireless access networks (BWANs). However, the several distinct challenges, including the random access contention among distributed users and the delay constraints in real-time traffic to the quality-of-service (QoS) guarantee at issue, make the designs of medium access control (MAC) layer a dramatically important step in wireless system developments. This dissertation focuses on how to provide differentiated QoS guarantee to heterogeneous traffic with real-time and non-real-time nature in BWANs. It deals with three main functions of centralized MAC protocols aiming at QoS guarantee: multiple access control, fair scheduling, and admission control.
First of all, we start by proposing, designing and simulating the fuzzy control-based intelligent MAC (FiMAC) protocol for BWAN systems with a multi-QoS TDMA frame structure, aiming at optimizing random access-based multiple access control for heterogeneous traffic with provision of a differentiated QoS and fairness among all users. Concerning the issue, we identify the two-fold difficulties: i) there is the trade-off between the QoS requirements of real-time and non-real-time traffic, and ii) random access parameters are strictly dependent on the respective QoS requirements and their time-varying traffic load. In order to meet our goal, we define the optimal configuration of multi-QoS frame structure and the design parameters, and propose a fuzzy control scheme suited to optimally and dynamically determining the design parameters, which deals with a typical nonlinear and dynamic system and thus, cannot be handled by any existing conventional approach. In addition, we present a mobile-assisted random access control scheme to improve the 'fairness' performance. Consequently, an independent and adaptive QoS management considered in this approach facilitates simplicity, and the intelligent software supports MAC protocols in achieving better utilization and in meeting QoS requirements.
Second of all, we present a unified architecture of MAC with scheduling, which well coordinates multiple access control with fair scheduling algorithms. Specifically, we start by proposing layered access control which can significantly reduce the reservation overhead by signaling at a burst level rather than a packet level and using contention-free polling-based access scheme. We characterize the traffic in all service classes, including constant bit rate (CBR), real-time variable bit rate (rt-VBR) and available bit rate (ABR), in terms of their burst duration and size, from which the packet arrival instances can be simply estimated. In the sequel, under the layered access control framework, we develop the fair scheduling algorithms, which can effectively and fairly allocate resources by taking into consideration the QoS requirements of the supported service classes and by overcoming the distributed queuing problem in wireless environment. The proposed approach which incorporates a dynamic polling scheme on a burst level into the fair scheduling on a packet level, so called pollingbased layered access fair scheduling (P-LAFS) algorithms, turns out to be adequate for guaranteeing the QoS of the multimedia services. Simulation experiments are performed for all different types of services, and the results show that the proposed approach significantly improves the packet loss performance of rt-VBR services while achieving a reasonable level of fairness for the ABR services.
Finally, for efficient provisioning of QoS guarantees in BWANs, we employ a wireless effective bandwidth concept which gives a suitable tool to analyze the call admission, congestion control, and resource management applications. For that purpose, we use a discrete fluid flow analysis (FFA) rather than a continuous FFA, which considers changes to the queue size in discrete steps rather than approximating them as continuously variable. A key feature of this approach is its mathematical elegance; the state probabilities are found to be a geometric progression giving a closed form solution for the packet loss probability. Results comparing both analytical approaches with simulation result clearly show the accuracy of our method. The proposed schemes for QoS-oriented MAC protocols in this dissertation are simple, efficient and flexible in providing broadband multimedia services over wireless access networks.
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