公开(公告)号：US12114338B2

公开(公告)日：2024-10-08

申请号：US17326237

申请日：2021-05-20

Applicant: Electronics and Telecommunications Research Institute

Inventor： Hee Wook Kim ,  Jae Young Ahn

IPC: H04W72/04 ,  H04W72/51 ,  G08G5/00 ,  H04W72/0453

CPC classification number: H04W72/51 ,  G08G5/0013 ,  G08G5/0069 ,  H04W72/0453

Abstract: A dynamic channel assignment method includes receiving, at a ground control station (GCS), assignment of a first communication channel set from a spectrum authority before takeoff of the unmanned aircraft; receiving, at the GCS, assignment of a second communication channel set when the unmanned aircraft is to move from a first area using the first communication channel set to a second area using the second communication channel set due to a flight plan of the unmanned aircraft after takeoff of the unmanned aircraft; and after the unmanned aircraft enters the second area, maintaining, at the GCS, the first communication channel set when the unmanned aircraft reenters the first area due to the flight plan, and returning, at the GCS, the first communication channel set to the spectrum authority when the unmanned aircraft does not reenter the first area due to the flight plan.

公开(公告)号：US10810885B2

公开(公告)日：2020-10-20

申请号：US16141763

申请日：2018-09-25

Applicant: Electronics and Telecommunications Research Institute

Inventor： Hee Wook Kim

IPC: G08G5/00 ,  H04W4/40 ,  H04W52/32 ,  H04W52/36 ,  H04W52/38 ,  G07C5/00 ,  B64C39/02

Abstract: Disclosed is a method and apparatus for transmitting data of an unmanned aerial vehicle control system. According to an embodiment of the present disclosure, provided is a method of transmitting data of an unmanned aerial vehicle control system, the method including: connecting an unmanned aerial vehicle to a ground radio station via a mission data link and a non-mission data link; checking a maximum transmit power of the non-mission data link; checking a margin value of the non-mission data link considering a state of the unmanned aerial vehicle; checking a required transmit power of the non-mission data link by applying the margin value of the non-mission data link; and determining a transmit power of the non-mission data link by comparing the maximum transmit power with the required transmit power.

公开(公告)号：US20150126239A1

公开(公告)日：2015-05-07

申请号：US14399926

申请日：2012-12-27

Applicant: Electronics and Telecommunications Research Institute

Inventor： Hee Wook Kim ,  Kun Seok Kang ,  Bon Jun Ku ,  Do Seob Ahn

IPC: H04W52/14

CPC classification number: H04W52/146 ,  H04W52/143 ,  H04W52/325

Abstract: Provided is a power control and link adaptation method for compensating for a long round trip delay time and slow channel fading in a long term evolution (LTE)-based mobile communication system having a long round trip delay time, similar to a satellite mobile system, the method that may compensate for the long round trip delay time of the satellite mobile system in which a distance between a base station and a terminal is relatively long, when compared to a terrestrial LTE system, support a modulation and coding scheme (MCS) level requested by a terminal, by predicting a channel after the round trip delay time elapses, maintain compatibility within an existing LTE frame, by generating a transmit power control (TPC) instruction for an uplink closed-loop power control, on a frame by frame basis, and compensate for slow channel fading of the satellite mobile system.

Abstract translation: 提供了一种功率控制和链路自适应方法，用于补偿具有长的往返延迟时间的长期演进（LTE）移动通信系统中的长的往返延迟时间和慢的信道衰落，类似于卫星移动系统， 与地面LTE系统相比，可以补偿基站和终端之间的距离相对较长的卫星移动系统的长往返延迟时间的方法支持调制和编码方案（MCS）级 由终端请求，通过在往返延迟时间之后预测信道，通过在逐帧的基础上生成上行链路闭环功率控制的发射功率控制（TPC）指令，保持现有LTE帧内的兼容性 并补偿卫星移动系统的慢速信道衰落。

公开(公告)号：US20150146631A1

公开(公告)日：2015-05-28

申请号：US14399903

申请日：2012-12-10

Applicant: Electronics and Telecommunications Research Institute

Inventor： Hee Wook Kim ,  Kun Seok Kang ,  Bon Jun Ku ,  Do Seob Ahn

IPC: H04W74/08

CPC classification number: H04W74/0833 ,  H04L5/00 ,  H04L5/0007 ,  H04L5/0053 ,  H04W28/04 ,  H04W72/04 ,  H04W72/12 ,  Y02D70/1262

Abstract: A random access method in a mobile communication system, the random access method for supporting random access with a cell size of about 100 kilometers (km) or more and a power limited terminal and a preamble structure thereof are provided. While a conventional long term evolution (LTE) random access preamble sequence is reused, a difference in a round-trip delay time between terminals in a large cell area may be compensated. Additionally, since higher power transmission is achieved per bandwidth, a higher link margin may be secured. Also, compatibility with resource scheduling of the conventional LTE may be maintained. Random access may be supported in a large cell, and a preamble structure of a satellite mobile communication may be implemented based on terrestrial LTE.

Abstract translation: 提供了一种移动通信系统中的随机接入方法，提供了用于支持大约100千米（km）以上的小区大小的随机接入的随机接入方法和功率限制终端及其前导码结构。 虽然传统的长期演进（LTE）随机接入前导码序列被重用，但可以补偿大小区域中的终端之间的往返延迟时间的差异。 此外，由于每个带宽实现更高的功率传输，所以可以确保更高的链路余量。 此外，可以保持与常规LTE的资源调度的兼容性。 可以在大小区中支持随机接入，并且可以基于地面LTE来实现卫星移动通信的前导码结构。

公开(公告)号：US10560180B2

公开(公告)日：2020-02-11

申请号：US15600044

申请日：2017-05-19

Applicant: Electronics and Telecommunications Research Institute

Inventor： Kwang Jae Lim ,  Hee Wook Kim

IPC: H04B7/185

Abstract: A ground radio station (GRS) apparatus and a radio station apparatus included in an unmanned aerial vehicle (UAV) are provided. The GRS apparatus may include an antenna configured to transmit and receive a radio frequency (RF) signal, an RF and/or intermediate frequency (IF) (RF/IF) chain configured to perform a conversion between the RF signal and a baseband signal, a baseband transceiving processor configured to transmit and receive the baseband signal, and a BB-IF interface configured to map the baseband signal to the RF/IF chain or the baseband transceiving processor.

公开(公告)号：US09544160B2

公开(公告)日：2017-01-10

申请号：US14399922

申请日：2012-12-11

Applicant: Electronics and Telecommunications Research Institute

Inventor： Hee Wook Kim ,  Kun Seok Kang ,  Bon Jun Ku ,  Do Seob Ahn

IPC: H04J11/00 ,  H04L12/18 ,  H04W4/06 ,  H04L27/26 ,  H04B7/185 ,  H04L5/00 ,  H04L12/58

CPC classification number: H04L12/189 ,  H04B7/18513 ,  H04B7/18517 ,  H04B7/18563 ,  H04L5/0007 ,  H04L5/0037 ,  H04L5/0051 ,  H04L5/0053 ,  H04L27/2602 ,  H04L27/2614 ,  H04L51/10 ,  H04W4/06

Abstract: Provided is a communication method for downlink transmission with a low peak to average power ratio (PAPR) and compatibility with long-term evolution (LTE)-based downlink transmission in an LTE-based mobile communication system in which the performance degradation may occur due to a high PAPR in multi-carrier transmission caused by non-linearity of a power amplifier in a base station including a satellite, to have the effects of supporting a terminal that reuses an existing terrestrial LTE chipset and a terminal that enables downlink reception with a low PAPR with no collision between the terminals, and of implementing an integrated satellite/terrestrial mobile communication system with a minimum change of an existing mobile communication system to ensure economic efficiency.

Abstract translation: 提供了一种用于在基于LTE的移动通信系统中具有低峰值平均功率比（PAPR）和与基于长期演进（LTE）的下行链路传输的兼容性的下行链路传输的通信方法，其中由于 由包括卫星的基站中的功率放大器的非线性引起的多载波传输中的高PAPR，具有支持使现有的地面LTE芯片组重新使用的终端的效果和能够以低的速率进行下行链路接收的终端 PAPR，终端之间没有冲突，并且实施了集成的卫星/地面移动通信系统，其中现有移动通信系统的变化最小化，以确保经济效率。

公开(公告)号：US09338790B2

公开(公告)日：2016-05-10

申请号：US14079056

申请日：2013-11-13

Applicant: Electronics and Telecommunications Research Institute

Inventor： Tae Chul Hong ,  Hee Wook Kim

IPC: H04W72/12 ,  H04W72/04 ,  H04W84/12 ,  H04W74/08

CPC classification number: H04W72/121 ,  H04W72/0413 ,  H04W72/042 ,  H04W72/0446 ,  H04W72/12 ,  H04W74/0833 ,  H04W84/12

Abstract: A system and method for wireless communication that schedules a connection time of a terminal based on a delay time is provided. A base station of the system for wireless communication may include a delay time determiner to determine a delay time of a terminal, based on preamble information for a plurality of terminal groups based on location information of the terminal, and a scheduler to schedule a connection time for the terminal to connect to the base station, using the delay time.

Abstract translation: 提供了一种用于基于延迟时间调度终端的连接时间的无线通信的系统和方法。 基于用于无线通信的系统的基站可以包括延迟时间确定器，用于基于终端的位置信息，基于用于多个终端组的前导码信息来确定终端的延迟时间，以及调度器来调度连接时间 为了使终端连接到基站，使用延迟时间。

公开(公告)号：US09277505B2

公开(公告)日：2016-03-01

申请号：US14399926

申请日：2012-12-27

Applicant: Electronics and Telecommunications Research Institute

Inventor： Hee Wook Kim ,  Kun Seok Kang ,  Bon Jun Ku ,  Do Seob Ahn

IPC: H04B7/00 ,  H04W52/14 ,  H04W52/32

CPC classification number: H04W52/146 ,  H04W52/143 ,  H04W52/325

Abstract: Provided is a power control and link adaptation method for compensating for a long round trip delay time and slow channel fading in a long term evolution (LTE)-based mobile communication system having a long round trip delay time, similar to a satellite mobile system, the method that may compensate for the long round trip delay time of the satellite mobile system in which a distance between a base station and a terminal is relatively long, when compared to a terrestrial LTE system, support a modulation and coding scheme (MCS) level requested by a terminal, by predicting a channel after the round trip delay time elapses, maintain compatibility within an existing LTE frame, by generating a transmit power control (TPC) instruction for an uplink closed-loop power control, on a frame by frame basis, and compensate for slow channel fading of the satellite mobile system.

Abstract translation: 提供了一种功率控制和链路自适应方法，用于补偿具有长的往返延迟时间的长期演进（LTE）移动通信系统中的长的往返延迟时间和慢的信道衰落，类似于卫星移动系统， 与地面LTE系统相比，可以补偿基站和终端之间的距离相对较长的卫星移动系统的长往返延迟时间的方法支持调制和编码方案（MCS）级 由终端请求，通过在往返延迟时间之后预测信道，通过在逐帧的基础上生成上行链路闭环功率控制的发射功率控制（TPC）指令，保持现有LTE帧内的兼容性 并补偿卫星移动系统的慢速信道衰落。

公开(公告)号：US11909500B2

公开(公告)日：2024-02-20

申请号：US17526666

申请日：2021-11-15

Applicant: Electronics and Telecommunications Research Institute

Inventor： Hee Wook Kim

IPC: H04B7/185 ,  H04W76/15

CPC classification number: H04B7/18506 ,  H04W76/15

Abstract: An operation method of a first communication node may comprise: establishing a first wireless connection with a GCS; establishing a second wireless connection with the GCS; transmitting and receiving data to and from the GCS through a first end-to-end connection based on the first wireless connection; reporting a communication quality of the first wireless connection to the GCS; receiving a link switch request from the GCS; switching a link from the first wireless connection to the second wireless connection based on the link switch request; and transmitting and receiving data through a second end-to-end connection based on the second wireless connection.

公开(公告)号：US10575312B2

公开(公告)日：2020-02-25

申请号：US15827527

申请日：2017-11-30

Applicant: Electronics and Telecommunications Research Institute

Inventor： Hee Wook Kim ,  Kwang Jae Lim ,  Tae Chul Hong

IPC: H04W72/08 ,  H04B7/185 ,  H04W72/04

Abstract: Disclosed is a channel assignment method of a communication system for controlling an unmanned aerial vehicle (UAV), the method including receiving assignment data and an interference analysis criterion from a spectrum authority; performing an interference analysis and selecting a control and non-payload communication (CNPC) channel based on the assignment data and the interference analysis criterion; and requesting the spectrum authority for assigning the CNPC channel.