Adaptive Mechanism for Distributed Opportunistic Scheduling

作者：Garcia Saavedra Andres^*; Banchs Albert; Serrano Pablo; Widmer Joerg

来源：IEEE Transactions on Wireless Communications, 2015, 14(6): 3494-3508.

DOI：10.1109/TWC.2015.2407367

• Contention-based channel access
• distributed opportunistic scheduling
• control theory
• wireless networks

Distributed opportunistic scheduling ( DOS) techniques have been recently proposed for improving the throughput performance of wireless networks. With DOS, each station contends for the channel with a certain access probability. If a contention is successful, the station measures the channel conditions and transmits in case the channel quality is above a certain threshold. Otherwise, the station does not use the transmission opportunity, allowing all stations to recontend. A key challenge with DOS is to design a distributed algorithm that optimally adjusts the access probability and the threshold of each station. To address this challenge, in this paper, we first compute the configuration of these two parameters that jointly optimizes throughput performance in terms of proportional fairness. Then, we propose an adaptive algorithm based on control theory that converges to the desired point of operation. Finally, we conduct a control theoretic analysis of the algorithm to find a setting for its parameters that provides a good tradeoff between stability and speed of convergence. Simulation results validate the design of our mechanism and confirm its advantages over previous works.

• 出版日期2015-6