Abstract:
A method and device for detecting an illegal unmanned aerial vehicle (UAV) using a radio wave wall are provided. The method includes generating a radio wave wall between a plurality of reconnaissance UAVs that include a first reconnaissance UAV and second reconnaissance UAVs, using one or more wireless signals transmitted and received between the plurality of reconnaissance UAVs, and determining whether an illegal UAV enters the radio wave wall based on radio signal strengths of wireless signals received from the second reconnaissance UAVs.
Abstract:
A base station broadcasts information of an entire discontinuous signal transmission duration and information of a discontinuous signal transmission interval to a plurality of terminals, and stops transmission of a downlink control signal and data for at least some interval of the discontinuous signal transmission interval.
Abstract:
An intruder location-based dynamic virtual fence configuration and a multiple image sensor device operation method are provided. A method of detecting an intruder based on a virtual fence includes detecting an intruder invading a virtual fence set in a protection area by using a first image sensor device, and tracking the intruder through cooperation with second image sensor devices adjacent to the first image sensor device, based on information of the intruder.
Abstract:
Provided are a method and system for detecting a UAV using a plurality of image sensors. A method of detecting a UAV includes detecting, by each of a plurality of detection image sensors, a UAV in a UAV detection area, transmitting, when the UAV is detected, position information of the detection image sensor detecting the UAV and distance information of the UAV to a classification image sensor, acquiring, by the classification image sensor, a magnified image of the UAV by setting a parameter of a camera of the classification image sensor according to the position information and the distance information, and classifying a type of the UAV by analyzing the magnified image.
Abstract:
In a wireless communication system where a terminal and a base station communicate with each other using a frame including at least one downlink sub-frame and at least one uplink sub-frame, the terminal and the base station calculate the number of hybrid automatic repeat request (HARQ) feedback regions of the downlink sub-frames and the uplink sub-frames in accordance with a third value corresponding to an absolute value of subtraction between a first value corresponding to the number of downlink sub-frames of the frame and a second value corresponding to the number of uplink sub-frames of the frame or the sum of the first value and the second value and configure HARQ feedback regions in the downlink sub-frames and the uplink sub-frames.