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

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 i...

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Bibliographic Details
Published inWireless personal communications Vol. 71; no. 3; pp. 2111 - 2123
Main Authors Peng, Yuefeng, Yang, Wei, Zhu, Yuan, Kim, Young-Il
Format Journal Article
LanguageEnglish
Published Boston Springer US 01.08.2013
Springer
Subjects
Applied sciences
Channels
Communications Engineering
Computer Communication Networks
Dynamical systems
Dynamics
Engineering
Equipments and installations
Exact sciences and technology
Feedback
Gain
Mobile radiocommunication systems
Networks
Radiocommunications
Reporting
Signal,Image and Speech Processing
Stations
Switches
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Teletraffic
Wireless communication
MU-MIMO
Feedback
SU-MIMO
CSI reporting
MIMO system
Multiple access
Channel estimation
Base station
Feedback regulation
Wireless network
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Summary: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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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ISSN:0929-6212
1572-834X
DOI:10.1007/s11277-012-0926-6