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A MU-MIMO User Scheduling Mechanism based on Active CSI Exchange  

Lee, Kyu-Haeng (서울대학교 컴퓨터공학부)
Kim, Chong-Kwon (서울대학교 컴퓨터공학부)
Publication Information
Journal of KIISE:Information Networking / v.41, no.4, 2014 , pp. 192-201 More about this Journal
Abstract
User scheduling boosts the Multi-User Multi-Input Multi-Output (MU-MIMO) gain by selecting an optimal set of users to increase the 802.11 Wi-Fi system capacities. Many kinds of user scheduling algorithms, however, fail to realize the advantages of MU-MIMO due to formidable Channel State Information (CSI) overhead. In this paper, we propose a user scheduling method considering such CSI exchange overhead and its MAC protocol, called ACE (Active CSI Exchange based User Scheduling for MU-MIMO Transmission). Unlike most proposals, where user scheduling is performed after an Access Point (AP) receives CSI from all users, ACE determines the best user set during the CSI exchange phase. In particular, the AP broadcasts a channel hint about previously scheduled users, and the remaining users actively send CSI reports according to their Effective Channel Gains (ECGs) calculated from the hint. Through trace-driven MATLAB simulations, we prove that the proposed scheme improves the throughput gain significantly.
Keywords
MU-MIMO; scheduling; CSI; overhead;
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