Frequency gradient metasurface device and method based on fast beam steering system

Patent metadata

Field	Value
Publication number	US-12218789-B2
Application number	US-202018000352-A
Country	US
Kind code	B2
Filing date	Jun 1, 2020
Priority date	Jun 1, 2020
Publication date	Feb 4, 2025
Grant date	Feb 4, 2025

Abstract

The present specification provides a method, performed by a device, for transmitting information about a pencil beam timing offset in a wireless optical communication system, in which a reference synchronization time is obtained, wherein the reference synchronization time is obtained on the basis of a cell-reference synchronization signal (C-RSS) received from another device, a peak energy time is obtained, the pencil beam timing offset is obtained on the basis of the reference synchronization time and the peak energy time, and information about the pencil beam timing offset is transmitted to the other device.

First claim

What is claimed is:

1. A method of transmitting information for a pencil beam timing offset in a wireless optical communication system, the method performed by an apparatus and comprising:
receiving a cell-reference synchronization signal (C-RSS) which is a sequence-based signal from a specific apparatus;
receiving a pencil beam which is a pulsed signal having a specific magnitude from the specific apparatus;
acquiring a reference synchronization time based on the C-RSS;
acquiring a peak energy time by energy detection of the pencil beam;
acquiring the pencil beam timing offset based on a difference between the reference synchronization time and the peak energy time among a plurality of pencil beam timing offsets; and
transmitting information for the pencil beam timing offset to the specific apparatus,
wherein each of the plurality of pencil beam timing offsets is related to a beam emitted on one of cell area spaces.

2. The method of claim 1 , wherein the peak energy time is acquired within a beam tracking time.

3. The method of claim 1 , wherein the C-RSS and the pencil beam are transmitted within a beam search block (BSB) by the specific apparatus.

4. The method of claim 3 , wherein an area where the C-RSS is transmitted and an area where the pencil beam is transmitted are time division multiplexed (TDM).

5. The method of claim 3 , wherein an area where the C-RSS is transmitted and an area where the pencil beam is transmitted are frequency division multiplexed (FDM).

6. The method of claim 3 , wherein the BSB is periodically repeated based on a predetermined period.

7. The method of claim 1 , wherein the apparatus receives data from the specific apparatus in response to the transmission of the information for the pencil beam timing offset.

8. An apparatus comprising:
at least one transceiver;
at least one memory; and
at least one processor operably coupled with the at least one memory and the at least one transceiver, wherein the at least one memory stores instructions that, based on being executed by the at least one processor, cause the at least one processor to perform operations comprising:
receiving a cell-reference synchronization signal (C-RSS) which is a sequence-based signal from a specific apparatus;
receiving a pencil beam which is a pulsed signal having a specific magnitude from the specific apparatus;
acquiring a reference synchronization time based on the C-RSS;
acquiring a peak energy time by energy detection of the pencil beam;
acquiring a pencil beam timing offset based on a difference between the reference synchronization time and the peak energy time among a plurality of pencil beam timing offsets; and
controlling the transceiver to transmit information for the pencil beam timing offset to the specific apparatus,
wherein each of the plurality of pencil beam timing offsets is related to a beam emitted on one of cell area spaces.

Assignees

• Lg Electronics Inc

Inventors

• Lee Hojae
• Lee Sangrim
• Kim Bonghoe
• Kim Sunam
• Jeon Kijun
• Ahn Byungkyu

Classifications

• H04L7/0075

  with photonic or optical means · CPC title

• H04B10/40 Primary

  Transceivers · CPC title

• H04B10/11

  Arrangements specific to free-space transmission, i.e. transmission through air or vacuum · CPC title

• H04L27/2662 Primary

  Symbol synchronisation · CPC title

• H04B10/114

  Indoor or close-range type systems · CPC title