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

  • Authors:
  • Yuefeng Peng;Wei Yang;Yuan Zhu;Young-Il Kim

  • Affiliations:
  • School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing, China 100044 and Mobile Wireless Group, Wireless Technology Division, Intel Corporation, Beijing, China 1001 ...;National Mobile Communications Research Laboratory, Southeast University, Nanjing, China 210096;Mobile Wireless Group, Wireless Technology Division, Intel Corporation, Beijing, China 100190;School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing, China 100044 and Wireless System Research Group, Electronics and Telecommunications Research Institute, Daej ...

  • Venue:
  • Wireless Personal Communications: An International Journal
  • Year:
  • 2013

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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.