# US 10,320,460 B2 · Method for transmitting signal through high-frequency band in wireless communication system, and apparatus therefor

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- Number: US 10,320,460 B2
- Document ID: US10320460B2
- Status: Granted
- Kind: B2
- Application number: 15/320,285
- Filed: 2014-06-24
- Published: 2017-05-25
- Granted: 2019-06-11
- Earliest claimed: 2014-06-24
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Kitae Kim; Heejin Kim; Kukheon Choi; Jiwon Kang; Kilbom Lee
- Web page: https://patentgrep.com/patent/US10320460B2

## CPC

- H04B 7/0617: {for beam forming}
- H04B 7/0417: Feedback systems
- H04B 7/0434: {using multiple eigenmodes}
- H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B 7/0486: {taking channel rank into account}
- H04B 7/0628: {Diversity capabilities}
- H04L 1/06: using space diversity
- H04L 25/03343: {Arrangements at the transmitter end}
- H04L 25/03898: {codebook-based design (selection of codebook or precoding matrix for MIMO diversity systems H04B7/0456)}
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A method for a transmitting end transmitting a signal to a receiving end in a wireless communication system is provided. The method includes receiving, from the receiving end, information on a first precoder and a second precoder which are for a channel between the transmitting end and the receiving end and transmitting a signal to the receiving end based on the first precoder where the signal is transmitted to the receiving end based on the second precoder if the receiving performance of the receiving end based on the first precoder is greater than or equal to a threshold value.

## Claims

### Claim 1

A method of transmitting a signal by a base station (BS) in a wireless communication system, the method comprising:
receiving, from a user equipment (UE), first information related to a first precoder and a second precoder;
precoding a first signal based on the first precoder and transmitting the precoded first signal to the UE;
receiving second information related to a reception quality of the transmitted precoded first signal;
determining an amount of change in the reception quality based on the received second information; and
precoding a second signal using the second precoder and transmitting the precoded second signal to the UE when the determined amount of change is equal to or greater than a threshold value,
wherein each of the first and the second precoders is a matrix for precoding the signal.

### Claim 2 (depends on 1)

The method of claim 1, wherein:
the first precoder corresponds to an Eigen value having a largest value resulting from an Eigen value decomposition of a channel between the BS and the UE; and
the second precoder corresponds to an Eigen value having a second largest value resulting from the Eigen value decomposition.

### Claim 3 (depends on 1)

The method of claim 1, further comprising transmitting a signal precoded by the first precoder to the UE when an amount of change in a reception quality related to the transmitted second precoded signal is greater than the threshold value.

### Claim 4

A method of receiving a signal by a user equipment (UE) in a wireless communication, the method comprising:
transmitting, to a base station (BS), first information related to a first precoder and a second precoder;
receiving a first signal precoded by the first precoder from the BS;
determining an amount of change in a reception quality of the received first signal based on a reference signal included in the received first signal;
transmitting, to the BS, second information related to the determined amount of change in the reception quality; and
receiving a second signal precoded by the second precoder from the BS when the determined amount of change is equal to or greater than a threshold value.

### Claim 5 (depends on 4)

The method of claim 4, further comprising performing an Eigen value decomposition on a channel between the BS and the UE before transmitting the second information, wherein:
the first precoder corresponds to an Eigen value having a largest value resulting from the Eigen value decomposition; and
the second precoder corresponds to an Eigen value having a second largest value resulting from the Eigen value decomposition.

### Claim 6 (depends on 4)

The method of claim 4, further comprising receiving a signal precoded by the first precoder from the BS when an amount of change in a reception quality corresponding to the received second precoded signal is greater than the threshold value.