Electronics and Telecommunications Research Institute

Hee Wook Kim

Do-Seob Ahn

Kwang Jae Lim

Ho Jin Lee

Tae Chul Hong

Kun Seok Kang

Bon Jun Ku

Do Seob Ahn

Kunseok Kang

Jae Young Ahn

KunSeok Kang

Dae Sub Oh

Seung Hyun Nam

A method of a base station may comprise: mapping at least one port of the base station to each of a plurality of user equipments (UEs) to be overloaded; configuring overloading signatures for a code division multiplexing (CDM) scheme; mapping the overloading signatures with the plurality of UEs to be overloaded, respectively; transmitting a message including configuration information of the overloading signatures to the plurality of UEs; and transmitting, to the plurality of UEs, signals multiplexed by the CDM scheme using the overloading signatures.

Method and apparatus for overloading data and user equipments in wireless communication system

A method and device for transmitting and receiving signals with a terrestrial station by using a radio frame including five subframes each of which includes a plurality of slots used for the uplink signal and/or the downlink signal are provided.

Method and apparatus for transmitting signal of wireless device for unmanned aircraft system

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.

Methods and procedures for dynamic channel assignment and change in unmanned aircraft system (UAS) control and non-payload communication

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.

Method and apparatus for interworking between multiple drone communications

Disclosed is a method and apparatus for selecting a channel for UAV control and non-payload communication on the basis of a channel interference analysis. According to an embodiment of the present disclosure, provided is a method of selecting a UAV control channel on the basis of an interference analysis, the method including: performing, by a user device, the interference analysis; selecting, by the user device, a channel on the basis of a result of the interference analysis; requesting, by the user device, a central management device to approve the selected channel; and performing, by the user device, communication with a UAV on the channel approved by the central management device.

Method and apparatus for selecting unmanned aerial vehicle control and non-payload communication channel on basis of channel interference analysis

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.

Method and apparatus for transmitting data of unmanned aerial vehicle control system

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.

Method of assigning channel for UAS control and non-payload communication (CNPC) system

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.

Ground radio station (GRS) apparatus and radio station apparatus included in unmanned aerial vehicle (UAV)

A channel access method in an unmanned aerial vehicle (UAV) control and non-payload communication (CNPC) system is provided. The channel access method may include setting an uplink frequency and a downlink frequency to each of a ground station and an airborne radio station, and performing, by the ground station and the airborne radio station, an initial access using the uplink frequency or the downlink frequency.

Channel access method in unmanned aerial vehicle (UAV) control and non-payload communication (CNPC) system

Disclosed are methods for communication channel setting and connection establishment in a new UAS CNPC system which can dynamically allocate a UA controlling a communication frequency resource to efficiently operate multiple UAs to channels in a limited UA control dedicated frequency band in a national airspace and be applied even to a next-generation P2MP type CNPC system, in order to stably operate the UA and extend the demand of the UA. That is, the present invention has been made in an effort to provide a method for setting a UA controlling communication channel between a ground radio station (GRS) and an unmanned aircraft (UA), which is used for supporting dynamic allocation and management of a UA controlling communication channel and a procedure for establishing connection of a UA controlling communication channel among a ground control system (GCS), the ground radio station (GRS), and the unmanned aircraft (UA).

Methods for initial channel setting and connection establishment in unmanned aircraft systems (UAS) control and non-payload communication (CNPC)

A handover method and a control transfer method are provided. A handover method of performing an inter-cell handover between a first ground station and a second ground station may include setting a first channel to the second ground station, measuring, by an airborne radio station, a second channel and reporting a measurement result to the first ground station, sending, by the first ground station, a handover request to at least one of a ground control station (GCS) or a control and non-payload communication (CNPC) network, determining, by the at least one of the GCS or the CNPC network, whether to perform a handover, and transmitting, by the at least one of the GCS or the CNPC network, a handover instruction to the airborne radio station based on a result of the determining.

Handover method and control transfer method

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.

Method for enhanced uplink transmission having low PAPR in LTE-based mobile communication system

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.

Random access method and random access channel structure in mobile communication system having large cell radius

Disclosed is a low-rate data transmission method in an LTE based satellite radio interface, which can secure a large number of low-rate data channels which can simultaneously access and increase frequency efficiency while providing compatibility with the existing LTE radio interface through a transmission technique which can secure more link margins in communication between portable terminals (handheld type terminals) without changing a basic LTE transmission frame structure in a satellite system requiring high transmission power.

Low-rate data transmission in LTE based satellite ratio interface

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.

Growing community of inventors

Daejeon, South Korea

Hee Wook Kim