RLAM: A dynamic and efficient reinforcement learning-based adaptive mapping scheme in mobile WiMAX networks

Authors:
M. Louta;P. Sarigiannidis;S. Misra;P. Nicopolitidis;G. Papadimitriou
Affiliations:
Department of Informatics and Telecommunications Engineering, University of Western Macedonia, Kozani, Greece;Department of Informatics and Telecommunications Engineering, University of Western Macedonia, Kozani, Greece;School of Information Technology, Indian Institute of Technology, Kharagpur, West Bengal, India;Department of Informatics, Aristotle University of Thessaloniki, Thessaloniki, Greece;Department of Informatics, Aristotle University of Thessaloniki, Thessaloniki, Greece
Venue:
Mobile Information Systems
Year:
2014

Citing 16
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Abstract

WiMAX Worldwide Interoperability for Microwave Access constitutes a candidate networking technology towards the 4G vision realization. By adopting the Orthogonal Frequency Division Multiple Access OFDMA technique, the latest IEEE 802.16x amendments manage to provide QoS-aware access services with full mobility support. A number of interesting scheduling and mapping schemes have been proposed in research literature. However, they neglect a considerable asset of the OFDMA-based wireless systems: the dynamic adjustment of the downlink-to-uplink width ratio. In order to fully exploit the supported mobile WiMAX features, we design, develop, and evaluate a rigorous adaptive model, which inherits its main aspects from the reinforcement learning field. The model proposed endeavours to efficiently determine the downlink-to-uplink width ratio, on a frame-by-frame basis, taking into account both the downlink and uplink traffic in the Base Station BS. Extensive evaluation results indicate that the model proposed succeeds in providing quite accurate estimations, keeping the average error rate below 15% with respect to the optimal sub-frame configurations. Additionally, it presents improved performance compared to other learning methods e.g., learning automata and notable improvements compared to static schemes that maintain a fixed predefined ratio in terms of service ratio and resource utilization.