Patent · US Active

Mobile station apparatus, base station apparatus, MIMO system and data transmission method

US8873663B2 · kind B2 · utility

1Cited by

0References

12Claims

0Family size

Assignee

NTT DOCOMO, INC. · JP

Inventors

Hidekazu Taoka · Tokyo, JP
Katsutoshi Kusume · Munich, DE
Karim Ibrahim Khashaba · Tokyo, JP
Guido Dietl · Munich, DE

Key dates

Filing date	Nov 26, 2010
Grant date	Oct 28, 2014
Priority date	—
Expiry date	Jun 13, 2031

Classification

Technology area (CPC H)Electricity
CPC primaryH04W52/346
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

A data transmission method includes, in the mobile station apparatus, selecting a PMI and an RI corresponding to an Hermitian transpose of a channel matrix indicative of channel characteristics and calculating a CQI from the PMI. The method further includes transmitting the PMI, the RI, and the CQI to the base station apparatus as feedback information. The method further includes, in the base station apparatus, calculating a first data rate of a case of performing SU-MIMO transmission based on the PMI transmitted from the mobile station apparatus as feedback and calculating a second data rate of a case of performing ZF MU-MIMO transmission based on the PMI. The method further includes selecting a transmission scheme corresponding to a higher data rate between the first and second data rates.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.