A Novel CSI Feedback Method for Dynamic SU/MU MIMO Adaptation
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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.
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- A Novel CSI Feedback Method for Dynamic SU/MU MIMO Adaptation
Wireless Personal Communications
Volume 71, Issue 3 , pp 2111-2123
- Cover Date
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- Online ISSN
- Springer US
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- Wireless communication
- CSI reporting
- Industry Sectors
- Author Affiliations
- 1. School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing, 100044, China
- 3. Mobile Wireless Group, Wireless Technology Division, Intel Corporation, Beijing, 100190, China
- 2. National Mobile Communications Research Laboratory, Southeast University, Nanjing, 210096, China
- 4. Wireless System Research Group, Electronics and Telecommunications Research Institute, Daejoon, 350-350, Korea