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公开(公告)号：US09706574B2
公开(公告)日：2017-07-11
申请号：US14524439
申请日：2014-10-27
Applicant: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY
Inventor： Hyuk Lim , Wooyeol Choi
CPC classification number: H04W74/0816
Abstract: Disclosed is a wireless communication system including: an access point; and at least two wireless devices capable of transmitting packets to the access point at the same time, wherein the access point receives a packet from at least one of the at least two wireless devices within multi-packet reception (MPR) capability after determining whether packet reception is beyond the multi-packet reception (MPR) capability, when receiving a request to send (RTS) from one of the at least two wireless devices. Thus, it is possible to obtain maximum throughput by optimally using the MPR capability and stably perform packet communication even though the number of wireless devices changes or the wireless device is moved.
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公开(公告)号：US11546101B2
公开(公告)日：2023-01-03
申请号：US16526869
申请日：2019-07-30
Applicant: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY
Inventor： Hyuk Lim , Gyung Min Kim , Yong Gang Kim
Abstract: A cloud-based Wi-Fi network architecture consisting of a CU and RAUs is proposed as an improvement on the conventional Wi-Fi architecture with traditional access points (APs). In addition, a method for uplink data transmission in a cloud-based Wi-Fi network is proposed. In a conventional Wi-Fi network with independently operating APs, APs close to each other may not be able to utilize the same frequency band efficiently because of significant amounts of interference. However, in a cloud-based Wi-Fi network, the CU coordinates RAUs so that they can operate in the same frequency band by transmitting or receiving signals through the shared wireless medium to improve spectral efficiency. For each frequency band, the proposed system utilizes a diversity combining that combines multiple signals and introduces a single improved signal with high signal-to-noise ratio for uplink transmission in the cloud-based Wi-Fi network. In proposed uplink transmission method for a cloud-based Wi-Fi network, diversity combining is utilized with the immediate acknowledgement (ACK) transmission method that transmits the ACK frame to the client immediately before decoding. The proposed uplink data transmission method mitigates the performance degradation caused by the fronthaul propagation delay between the CU and RAUs, without significant modification of the IEEE 802.11 standard.
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公开(公告)号：US10057042B2
公开(公告)日：2018-08-21
申请号：US15065804
申请日：2016-03-09
Applicant: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY
Inventor： Hyuk Lim , Wooyeol Choi
IPC: H04L5/00 , H04W28/02 , H04L5/14 , H04L1/00 , H04W52/24 , H04W52/46 , H04W24/00 , H04W72/00 , H04W74/00 , H04W88/04 , H04W28/12
CPC classification number: H04L5/006 , H04L1/00 , H04L1/1671 , H04L5/0055 , H04L5/14 , H04W24/00 , H04W28/12 , H04W52/241 , H04W52/243 , H04W52/245 , H04W52/46 , H04W72/00 , H04W74/00 , H04W88/04
Abstract: The present invention includes: defining a transmission signal generated by the AP and a transmitter (TX) configured to transmit a signal to the AP and reception signals generated by the AP and receivers (RXs) configured to receive a signal from the AP, and canceling self-interference in consideration of a channel gain of the self-interference at the AP; defining a channel transmitted from the TX to the AP as uplink, defining a channel transmitted from the AP to the RX as downlink, and deriving a signal-to-interference-plus-noise ratio (SINR) for a signal transmittable on the uplink and the downlink; selecting an RX capable of maximizing a capacity sum of transmit powers of the AP and the TX; and selecting optimum transmit powers of the AP and the TX for maximizing SINRs of transmission on the uplink and the downlink.
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公开(公告)号：US09876808B2
公开(公告)日：2018-01-23
申请号：US14861665
申请日：2015-09-22
Applicant: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY
Inventor： Hyuk Lim , Jong-Won Kim , Jargalsaikhan Narantuya , Tae-Jin Ha , Chi-Wook Jeong
CPC classification number: H04L63/1416 , H04L43/024 , H04L43/026
Abstract: A method for detecting an intrusion in a network is disclosed. The network includes a plurality of nodes for data transmission/reception and switches for relaying flow transmission/reception between the nodes, and an intrusion detection system (IDS) is combined with the network to form a system The method includes: installing SDN-enabled switches for flow sampling in the network to connect them to SDN controllers; determining, by the SDN controller, the number of network flows and the number of switches; deriving a sampling rate for each of the SDN-enabled switches; forwarding, by the switches, packet information sampled at respective sampling rates to the IDS; and identifying, by the IDS, malicious data based on the packet information to update the sampling rate of each of the SDN switches.
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Patent Agency Ranking
公开(公告)号：US09408029B2
公开(公告)日：2016-08-02
申请号：US14558164
申请日：2014-12-02
Applicant: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY
Inventor： Hyuk Lim , In Shick Kim , Ryangsoo Kim
IPC: G01C21/00 , G08G1/123 , H04W4/02 , G01C21/26 , G08G1/0967
CPC classification number: H04W4/02 , G01C21/26 , G08G1/096716 , G08G1/096741 , G08G1/096775
Abstract: Disclosed is a data dissemination system for vehicles. The data dissemination system includes a vehicle, a vehicle cloud system, and access points connecting with and transferring data to the vehicle and the vehicle cloud system and being stationary near a road, wherein the vehicle comprises a navigator for determining location information, the vehicle cloud system comprises a dissemination setting unit for determining which data to disseminate to which access point based on the location information and vehicle route information, and the data disseminated to the access point is disseminated to the vehicle. According to the present invention, data transfer between vehicles and an infrastructure can be easily achieved such that a large amount of data can be exchanged therebetween, data transfer efficiency can be enhanced, and network resources can be fully utilized. Accordingly, the present invention has advantages of contributing to dissemination and utilization of the vehicle cloud system.
Abstract translation: 公开了一种车辆数据传播系统。 数据传播系统包括车辆，车辆云系统以及与车辆和车辆云系统连接并传送数据并在道路附近静止的接入点，其中车辆包括用于确定位置信息的导航器，车辆云 系统包括传播设置单元，用于基于位置信息和车辆路线信息来确定哪些数据传播到哪个接入点，并且传播到接入点的数据被传播到车辆。 根据本发明，可以容易地实现车辆和基础设施之间的数据传输，从而可以在其间交换大量的数据，从而可以提高数据传输效率，并且可以充分利用网络资源。 因此，本发明具有促进车辆云系统的传播和利用的优点。
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公开(公告)号：US11336622B2
公开(公告)日：2022-05-17
申请号：US16689003
申请日：2019-11-19
Applicant: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY
Inventor： Hyuk Lim , Sung Hwan Kim , Jargalsaikhan Narantuya , Seung Hyun Yoon
Abstract: An apparatus for deploying a firewall on a software-defined network (SDN) includes a public key distributor configured to transmit a public key, a resource monitor configured to monitor resources of a network, a host monitor configured to receive a firewall rule of at least one host, which is encrypted by the public key, a decryption unit configured to decrypt information received from the host monitor by using a secret key, a merge unit configured to merge the decrypted information to provide a merged firewall rule, and a firewall deployment unit configured to deploy the merged firewall rule to a switch.
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公开(公告)号：US10250317B2
公开(公告)日：2019-04-02
申请号：US15470868
申请日：2017-03-27
Applicant: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY
Inventor： Hyuk Lim , Wooyeol Choi
Abstract: A full-duplex communication method for a multi-hop wireless network including a source end for transmitting data, a destination end as a destination of the data and at least one relay for connecting the source end and the destination end wirelessly includes sending a transmission request from the source end to the destination end through the at least one relay in forward order, sending a transmission confirmation from the destination end to the source end through the at least one relay in reverse order in response to the transmission request and the at least one relay entering a ready state, and transmitting the data from the source end to the destination end through the at least one relay using a full-duplex scheme after receiving the transmission confirmation.
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8.发明授权公开(公告)号：US09337884B2
公开(公告)日：2016-05-10
申请号：US14030213
申请日：2013-09-18
Applicant: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY
Inventor： Hyuk Lim , Wooyeol Choi , Jaeseon Hwang
CPC classification number: H04B1/50 , H04L1/1678 , H04L1/18 , H04L1/188 , H04L2001/0092 , H04W74/0816
Abstract: Disclosed herein is a medium access control method in a single channel wireless network environment, which is a medium access control method of a receiving side terminal capable of communicating in a full-duplex communication scheme. The medium access control method includes: receiving a frame header of a data frame; and transmitting an ACK frame in response to the frame header.
Abstract translation: 这里公开了在单通道无线网络环境中的媒体接入控制方法，它是能够以全双工通信方式进行通信的接收侧终端的媒体接入控制方法。 所述介质访问控制方法包括：接收数据帧的帧头; 以及响应于帧头部发送ACK帧。
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9.发明授权公开(公告)号：US09185727B2
公开(公告)日：2015-11-10
申请号：US14030256
申请日：2013-09-18
Applicant: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY
Inventor： Hyuk Lim , Jae Hyung Jang , Wooyeol Choi , Jaeseon Hwang
CPC classification number: H04W74/002 , H04B1/50 , H04W88/08
Abstract: In a medium access control method of an access point for a wireless LAN, the access point is capable of full-duplex communication, and the medium access control method includes receiving a frame header of a first data frame from a first terminal, and transmitting a second data frame to a second terminal while the first data frame is received from the first terminal.
Abstract translation: 在无线LAN的接入点的介质访问控制方法中，接入点能够进行全双工通信，并且媒体接入控制方法包括：从第一终端接收第一数据帧的帧头，并发送 当从第一终端接收到第一数据帧时，将第二数据帧发送到第二终端。
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