Wireless Personal Communications

, Volume 71, Issue 3, pp 2111–2123

A Novel CSI Feedback Method for Dynamic SU/MU MIMO Adaptation

Authors

    • School of Electronic and Information EngineeringBeijing Jiaotong University
    • Mobile Wireless Group, Wireless Technology DivisionIntel Corporation
  • Wei Yang
    • National Mobile Communications Research LaboratorySoutheast University
  • Yuan Zhu
    • Mobile Wireless Group, Wireless Technology DivisionIntel Corporation
  • Young-Il Kim
    • School of Electronic and Information EngineeringBeijing Jiaotong University
    • Wireless System Research GroupElectronics and Telecommunications Research Institute
Article

DOI: 10.1007/s11277-012-0926-6

Cite this article as:
Peng, Y., Yang, W., Zhu, Y. et al. Wireless Pers Commun (2013) 71: 2111. doi:10.1007/s11277-012-0926-6

Abstract

Channel state information (CSI) reporting at one mobile station (MS) often targets maximizing the throughput of one single link, hence is optimized for single-user multi-input multi-output (SU-MIMO) transmission at base station (BS). However, the system wide throughput may not be maximized when BS is performing multi-user multi-input multi-output (MU-MIMO) transmission utilizing the SU-MIMO optimized CSI reports, and vice versa. This CSI mismatch can cause system throughput degradation. In this paper, a novel CSI feedback method is proposed which can switch between SU-MIMO optimized CSI reporting mode and MU-MIMO optimized CSI reporting mode when instructed by BS’s signaling. System level simulation results show when BS is performing MU-MIMO transmission, significant throughput gain can be obtained if MS feeds back MU-MIMO optimized CSI reports instead of SU-MIMO optimized CSI reports. With the instruction of the BS signaling to dynamic indicate MS to switch between SU-MIMO and MU-MIMO optimized CSI reporting modes, the SU-MIMO performance is not compromised either.

Keywords

Wireless communicationSU-MIMOMU-MIMOCSI reportingFeedback
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Copyright information

© Springer Science+Business Media New York 2012