Title:
MOBILE STATION DEVICE, BASE STATION DEVICE, MIMO SYSTEM, AND DATA TRANSMISSION METHOD
Document Type and Number:
WIPO Patent Application WO/2011/065508
Kind Code:
A1
Abstract:
In order to improve data rates regardless of the magnitude of the spatial correlation between channels while also ensuring compatibility with LTE MIMO systems, a MIMO system for transmitting data while causing a base station device (eNode B) to switch between SU-MIMO transmission and ZF MU-MIMO transmission on the basis of feedback information from a mobile station device (UE) is configured so that: the mobile station device (UE) selects the PMI and RI corresponding to the Hermitian transposition of a channel matrix indicating propagation path characteristics, calculates the CQI from the PMI, and feeds back the PMI, RI, and CQI; and the base station device (eNode B) calculates a first data rate for SU-MIMO transmissions and a second data rate for ZF MU-MIMO transmission on the basis of the PMI that is fed back, and selects the transmission method corresponding to the higher of the first and second data rates.
Inventors:
TAOKA HIDEKAZU (DE)
KUSUME KATSUTOSHI (DE)
KHASHABA KARIM IBRAHIM (DE)
GEITL GUIDO (DE)
KUSUME KATSUTOSHI (DE)
KHASHABA KARIM IBRAHIM (DE)
GEITL GUIDO (DE)
Application Number:
PCT/JP2010/071176
Publication Date:
June 03, 2011
Filing Date:
November 26, 2010
Export Citation:
Assignee:
NTT DOCOMO INC (JP)
TAOKA HIDEKAZU (DE)
KUSUME KATSUTOSHI (DE)
KHASHABA KARIM IBRAHIM (DE)
GEITL GUIDO (DE)
TAOKA HIDEKAZU (DE)
KUSUME KATSUTOSHI (DE)
KHASHABA KARIM IBRAHIM (DE)
GEITL GUIDO (DE)
International Classes:
H04J99/00; H04W16/28
Other References:
MOTOROLA: "Comparison of PMI-based and SCF-based MU-MIMO", 3GPP TSG RAN1#58, RL-093421, 24 August 2009 (2009-08-24), XP050351704
ALCATEL-LUCENT ET AL.: "Dynamic SU-MU MIMO switching based on adaptive implicit feedback", 3GPP TSG RAN WG1 MEETING #59, R1-094610, 9 November 2009 (2009-11-09), XP050389019
YONGZING ZHOU ET AL.: "Flexible Multi-User MIMO with Limited Feedback", PROCEEDINGS OF THE IEEE 69TH VEHICULAR TECHNOLOGY CONFERENCE, 26 April 2009 (2009-04-26), pages 1 - 5, XP008158739
NTT DOCOMO: "Performance of DL MU-MIMO Based on Implicit Feedback Scheme in LTE-Advanced", 3GPP TSG RAN WG1 MEETING #60, R1-101218, 22 February 2010 (2010-02-22), XP008158730
ALCATEL-LUCENT ET AL.: "Dynamic SU-MU MIMO switching based on adaptive implicit feedback", 3GPP TSG RAN WG1 MEETING #59, R1-094610, 9 November 2009 (2009-11-09), XP050389019
YONGZING ZHOU ET AL.: "Flexible Multi-User MIMO with Limited Feedback", PROCEEDINGS OF THE IEEE 69TH VEHICULAR TECHNOLOGY CONFERENCE, 26 April 2009 (2009-04-26), pages 1 - 5, XP008158739
NTT DOCOMO: "Performance of DL MU-MIMO Based on Implicit Feedback Scheme in LTE-Advanced", 3GPP TSG RAN WG1 MEETING #60, R1-101218, 22 February 2010 (2010-02-22), XP008158730
Attorney, Agent or Firm:
AOKI, Hiroyoshi et al. (JP)
Hiroyoshi Aoki (JP)
Hiroyoshi Aoki (JP)
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