Pusan National University

JunHwan Huh

Donghyun Kim

Jongdeok Kim

Dong-Hyun Kim

Jaemin Lee

Jong-Deok Kim

Changhong Lee

Seung-gyu Byeon

Jae-Min Lee

Jaeyoung Jang

Jaeho Shin

Provided are an apparatus and method for AP placement of large-scale wireless LAN and adaptive wireless resource management enabling to analyze and utilize actual use patterns that were not reflected in initial installation to express characteristics of a building, and to establish strategies for selecting an optimal AP location and wireless resource management based thereon.

Apparatus and method for AP placement of large-scale wireless LAN and adaptive wireless resource management

Disclosed is a device for resolving high-speed competition and distributing multi-channels in consideration of large-scale access based on LoRaWAN that enables efficient and stable communication through limited channel resources in a large-scale wireless transmission environment through a wireless communication wide area network. The device includes a terminal node competition unit for receiving a synchronization beacon and transmitting an access request signal to a base station, and performing an aptive contention window algorithm and enabling a terminal node to enter a transmitter according to a feedback packet (FBP) competition result when the FBP is received from the base station; and a terminal node transmitter for selecting a channel according to queuing rules and checking data transmission queue (DTQ) order, transmitting data when the DTQ order is a transmission turn, standing by FBP reception, and determining whether a contention resolution interval is ended to perform a DTQ reassignment process.

Device and method for resolving high-speed competition and distributing multi-channels in consideration of large-scale access based on LoRaWAN

Proposed are a multi-access method and apparatus for a LoRa tag using backscatter communication. The multi-access apparatus for a LoRa tag using backscatter communication may include a contention slot unit configured to receive a signal for a contention participation request from a base station and participate in a contention according to a distributed queuing (DQ) protocol using a backscatter signal if data to be transmitted is present, an FBP unit configured to receive a result of the contention from the base station and check whether the result of the contention is a success, and a data slot unit configured to transmit sensed data to the base station using the backscatter signal if the result of the contention is a success.

Multi-access method and apparatus for lora tag using backscatter communication

Disclosed are a network coding method and apparatus for reliable communication in a LoRa communication system. The network coding apparatus may include a network server connected to an end node over a network to receive a packet transmitted by the end node in a LoRa communication system, a stationary gateway positioned between the network server and the end node to deliver the packet, transmitted by the end node, to the network server, and a temporary gateway positioned between the stationary gateway and the end node to deliver the packet, transmitted by the end node, to the stationary gateway.

Network coding method and apparatus for reliable communication in LoRa communication system

An apparatus for acquisition of fast multi-channel data based on a long range wide area network (LoRaWAN) includes: a contention period data processor configured to insert a flag indicating the apparatus itself into an initial contention resolution queue (CRQ), determine whether a flag is a flag of the apparatus, and transmit an access request sequence (ARS) during a contention period; a feedback period data processor configured to check whether information taken out from a data transmission queue (DTQ) is a flag of the apparats, check whether a contention of the apparatus is resolved, and check whether there is a slot for which contention is not resolved among other slots during a feedback period.

Apparatus and method for acquisition of fast multi-channel data based on LoRaWAN

A system for interactive management of remote devices based on LoRa communication includes: a web application configured to provide a remote control page to a user; a cloud system server configured to transmit a management command and a transmission option to a gateway and to receive a summary packet for received data; the gateway configured to receive, from the cloud system server, input request data, transmit the request data to a terminal node, decode response data, and transmit the decoded response data to the cloud system server; and the terminal node configured to receive the management command and the transmission option and transmit the management command and the transmission option to a managed device and store corresponding response data from the managed device through local buffer control.

Growing community of inventors

Busan, South Korea

JunHwan Huh