# US 10,312,982 B2 · Base station, mobile station and radio communication method

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- Number: US 10,312,982 B2
- Document ID: US10312982B2
- Status: Granted
- Kind: B2
- Application number: 15/768,070
- Filed: 2016-10-18
- Published: 2018-10-25
- Granted: 2019-06-04
- Earliest claimed: 2015-10-18
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Satoshi Nagata; Chongning Na; Huiling Jiang; Yuichi Kakishima
- Web page: https://patentgrep.com/patent/US10312982B2

## CPC

- H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B 7/0481: {using subset selection of codebooks}
- H04B 7/0617: {for beam forming}
- H04B 7/06952: {Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping}
- H04B: TRANSMISSION

## Abstract

To generate a configuration entry in a master codebook. A base station according to one aspect of the present invention includes a codebook generating unit that determines a codebook subset corresponding to a predetermined configuration entry from a plurality of configuration entries in a master codebook, and a transmitter that transmits information of the predetermined configuration entry.

## Claims

### Claim 1

A base station comprising:
a codebook generating unit that determines a codebook subset corresponding to one configuration entry from a plurality of configuration entries in a master codebook; and
a transmitter that transmits information of the one configuration entry,
wherein the plurality of configuration entries comprise four configuration entries,
a first configuration entry corresponds to a beam pattern in which an available beam is (0, 0),
a second configuration entry corresponds to a beam pattern in which available beams are (0, 0), (1, 0), (0, 1), (1, 1),
a third configuration entry corresponds to a beam pattern in which available beams are (0, 1), (1, 1), (2, 0), (3, 0), and
a fourth configuration entry corresponds to a beam pattern in which available beams are (0, 0), (1, 0), (2, 0), (3, 0),
where in (x, y), x indicates a relative index in a first direction and y indicates a relative index in a second direction.

### Claim 2 (depends on 1)

The base station according to claim 1, further comprising
a synthesizing unit that synthesizes beams based on the one configuration entry.

### Claim 3

A mobile station comprising:
a receiver that receives information of one configuration entry; and
a codebook generating unit that determines a codebook subset corresponding to the one configuration entry from a plurality of configuration entries in a master codebook,
wherein the plurality of configuration entries comprise four configuration entries,
a first configuration entry corresponds to a beam pattern in which an available beam is (0, 0),
a second configuration entry corresponds to a beam pattern in which available beams are (0, 0), (1, 0), (0, 1), (1, 1),
a third configuration entry corresponds to a beam pattern in which available beams are (0, 1), (1, 1), (2, 0), (3, 0), and
a fourth configuration entry corresponds to a beam pattern in which available beams are (0, 0), (1, 0), (2, 0), (3, 0),
where in (x, y), x indicates a relative index in a first direction and y indicates a relative index in a second direction.

### Claim 4

A radio communication method comprising:
determining a codebook subset corresponding to one configuration entry from a plurality of configuration entries in a master codebook; and
transmitting information of the one configuration entry,
wherein the plurality of configuration entries comprise four configuration entries,
a first configuration entry corresponds to a beam pattern in which an available beam is (0, 0),
a second configuration entry corresponds to a beam pattern in which available beams are (0, 0), (1, 0), (0, 1), (1, 1),
a third configuration entry corresponds to a beam pattern in which available beams are (0, 1), (1, 1), (2, 0), (3, 0), and
a fourth configuration entry corresponds to a beam pattern in which available beams are (0, 0), (1, 0), (2, 0), (3, 0),
where in (x, y), x indicates a relative index in a first direction and y indicates a relative index in a second direction.