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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 9240831 B1

PDFFull Text
Date of Patent:
Jan. 19, 2016

Filed:

Nov. 16, 2012

Radio base station apparatus, radio communication system and radio communication method

Applicant:

Ntt Docomo, Inc., Tokyo, JP;

Inventors:

Yuichi Kakishima, Tokyo, JP;

Satoshi Nagata, Tokyo, JP;

Hidekazu Taoka, Munich, DE;

Katsutoshi Kusume, Munich, DE;

Assignee:

NTT DOCOMO, INC., Tokyo, JP;

Attorney:

Osha Liang LLP

Primary Examiner:

Erin File

Int. Cl.
CPC ...
H04L 27/00 (2006.01); H04B 7/06 (2006.01); H04B 7/04 (2006.01);
U.S. Cl.
CPC ...
H04B 7/0615 (2013.01); H04B 7/0456 (2013.01); H04B 7/0469 (2013.01); H04B 7/065 (2013.01); H04B 7/0617 (2013.01); H04B 7/0691 (2013.01);
Abstract

The present invention is designed to implement radio communication to maintain good communication quality even when the number of antennas provided in a radio base station apparatus is greater than the number of transmission layers of a downlink control channel, a broadcast channel, and cell-specific reference signals. When, from a radio base station apparatus () having a plurality of transmitting antennas, at least one of a downlink control channel, a broadcast channel and a cell-specific reference signal is transmitted with fewer transmission layers than the number of all transmitting antennas, a smaller number of antennas than the number of all transmitting antennas are made virtual in a precoding weight multiplication section (), and also transmission weights that make the average transmission power of the transmitting antennas or transmission streams the same are multiplied, and the signals multiplied by the transmission weights are transmitted from the transmitting antennas on the downlink.

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Kakishima, Yuichi. (2016). Radio base station apparatus, radio communication system and radio communication method (U.S. Patent No. 9240831). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/9240831

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