Group TXOP Sharing: MAC Enhancements for CSI Feedback Overhead Amortization and User Selection

LI Zhaoxing; WEN Xiangming; LU Zhaoming

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Group TXOP Sharing: MAC Enhancements for CSI Feedback Overhead Amortization and User Selection

LI Zhaoxing 1,WEN Xiangming 2 *,LU Zhaoming 2

1.School of Information and Telecommunication Engineering,Beijing University of Posts and Telecommunications,100876;School of Information and Telecommunication Engineering,Beijing University of Posts and Telecommunications,100876;School of Information and Telecommunication Engineering,Beijing University of Posts and Telecommunications,100876

*Correspondence author

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Funding: none

Opened online: 6 October 2017

Accepted by: none

Citation: LI Zhaoxing,WEN Xiangming,LU Zhaoming.Group TXOP Sharing: MAC Enhancements for CSI Feedback Overhead Amortization and User Selection[OL]. [ 6 October 2017] http://en.paper.edu.cn/en_releasepaper/content/4741587

In wireless LANs (WLANs), heavy Channel State Information (CSI) feedback overhead has become a bottleneck in multi-user MIMO (MU-MIMO) transmission efficiency. Moreover, the current MAC protocol, like Quality of Service (QoS) based Transmission Opportunity (TXOP) Sharing, selects users without consideration of channel orthogonality which obviously influence the capacity of MU-MIMO. This results in bad user selection and excessive CSI feedback. This paper addresses these matters by proposing a cross-layer TXOP sharing mechanism, Group TXOP, which produces a Beamforming Group using a channel-based user selection mechanism and changes the TXOP holder from the Access Category (AC) to the Beamforming Group. Group TXOP takes advantage of channel orthogonality in selecting users and meanwhile amortizes the overhead to multiple frames by avoiding per-packet CSI feedback. The simulation results show that the relative overhead of CSI feedback reduces by 15% and the downlink throughput increases by 16% after using Group TXOP.

Keywords:WLAN; CSI feedback; user selection;TXOP sharing; MU-MIMO

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