• Proceedings of the Korea Information Processing Society Conference
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• 2024.05a
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• pp.383-385
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• 2024

이동통신 분야 사실표준화 기구인 3GPP(3rd Generation Partnership Project)에서는 기존의 5G 이동통신 기술을 향상시키기 위한 5G-Advanced 연구를 시작했다. 5G 및 5G-Advanced 시대에 접어들면서 네트워크를 향상시키기 위한 다양한 요소기술들이 등장하였지만, 이러한 기술 변화에 비례하여 네트워크를 위협하는 공격 표면들이 증가할 것으로 예상된다. 점진적인 네트워크 보안 위협에 대응하기 위해 보안 기술은 에드온(Add-on) 형태로 개발되었지만, 이는 이동통신시스템에서 보안 기술의 신뢰성을 낮추고 네트워크에 대한 보안 품질을 보장하지 못한다. 따라서, 본 논문에서는 5G-Advanced에서 사용되는 N2/N3 인터페이스에서 발생가능한 DoS(Denial of Service) 공격에 대해 실험하고 분석한다. 분석 결과는 5G-Advanced 이동통신시스템의 공격 표면을 나타내고 보안 내재화의 필요성을 강조한다.

• Journal of the Korea Society of Computer and Information
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• v.26 no.1
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• pp.103-110
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• 2021

In this paper, we compare two access control mechanisms for D2D(Device-to-Device) systems in 5G wireless networks and propose an effective access control for 5G D2D networks. Currently, there is no specified access control for 5G D2D networks but there can be two access control approaches for 5G D2D networks. One is the UE-to-Network Relay based access control and the other is the Remote UE(User Equipment) based access control. The former is a UE-to-Network Relay carries out the access control check for 5G D2D networks but the latter is a Remote UE performs the access control check for 5G D2D networks. Through simulation and evaluation, we finally propose the Remote UE based access control for D2D systems in 5G wireless networks. The proposed approach minimizes signalling overhead between the UE-to-Network Relay and the Remote UE and more efficiently performs the access control check, when the access control functionalities are different from the UE-to-Network Relay in 5G D2D networks.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.5
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• pp.103-109
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• 2018

One of the 5G goals is provide to high data rates for users moving at high speeds, such as trains. High mobility scenarios such as high speed train (HST) scenarios are expected to be typical scenarios for fifth generation communication systems. As the HST develops rapidly, it is necessary to transmit wireless communication data to train passengers, and the communication speed required by users is gradually increasing. HST users require high network capacity and stable communication services regardless of the location or speed of the HST communication system. Therefore, a transmission frame is constructed for the 5G mobile communication system in the mm band to be used for the fifth generation mobile communication, the HST communication system is implemented, and the performance of the wideband non-stationary MIMO HST channel is analyzed in the HST scenario.

• Electronics and Telecommunications Trends
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• v.31 no.1
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• pp.68-77
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• 2016

최근 들어 5G 이동통신 시스템을 위한 표준화 및 기술개발이 본격화되고 있으며, 기존 이동통신 시스템과 차별화되는 5G 이동통신 시스템의 대표적인 목표 중 하나는 사람이 휴대하는 단말기뿐만 아니라 생활 속 모든 사물을 네트워크에 연결하여 정보를 생성하고 공유하는 초연결 네트워크(Internet of Things: IoT) 구축이다. 시장 조사기관이나 다수의 전문가들은 2020년경에는 전 세계적으로 약 500억개의 디바이스가 네트워크에 연결되는 등 사물 디바이스의 폭발적 증가를 예상하며, 이를 통한 부가가치 창출과 시장이 급격히 성장할 것으로 전망하고 있다. 본고에서는 초다수의 사물 디바이스 수용을 위한 5G massive IoT 기술동향 및 이와 관련하여 현재 진행되는 3GPP 표준화 동향에 대해 기술한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.10a
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• pp.201-203
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• 2019

5G 시스템은 혁신적인 발전을 거듭하며 강력해진 기술 표준을 근간으로 초광대역 이동형 데이터 서비스, 대규모 사물통신 서비스 등을 제공하고 있다. 본 논문에서는 SW를 기반으로 한 5G의 기술 개발 방법론을 제안한다. 또, 실제 환경에서 차세대 모바일 네트워크의 성능 분석이 가능한 SW 기반의 시스템 레벨 테스트베드 및 모니터링 프로그램을 OAI(Openairinterface) 5G 연구 단체의 오픈소스를 이용하여 구현한다. 기존 하드웨어 위주의 단일 칩 시스템(SoC)을 이용한 구현은 손상되기가 쉽고 유지보수가 힘들다는 단점이 있다. 하지만 기존 하드웨어 칩을 소프트웨어 기반인 소스코드로 구현하면 유지 보수가 용이하다는 장점뿐만 아니라 하드웨어가 변경되더라도 다른 하드웨어에 호환되는 이식성 때문에 생산성이 높아지며 비용 절감의 효과도 기대할 수 있다.

• Journal of Internet Computing and Services
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• v.18 no.4
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• pp.27-34
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• 2017

In this paper, the analysis of mobile augmented reality service using 5G network are provided. First of all, the introduction and required performance of mobile augmented reality(MAr) service are provided. After that, 5G network key features, target performance, and network architecture are analyzed. At the end, the additional network entity and functions for the realization of mobile augmented reality service are proposed. The mobile augmented reality service time. At the end, the service delay in existing LTE system and proposed 5G MAr system by using real device and network parameters.

• Informatization Policy
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• v.27 no.4
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• pp.67-84
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• 2020

This study proposes a smart city service revitalization policy based on communication facility infrastructure in 5G CPS - the core of the 4th industrial revolution, R&D, and related legislations. The 5G CPS is a converged form of ICT technologies, communications facilities, and physical systems. In this study, we propose methods of creating new services for the smart city domain based on communication facilities and the cloud platform in 5G CPS - first, by improving the communication methods classification system based on the facility scale; second, by establishing the national telecommunication facility infrastructure and making long-term investment; third, by reorganizing the Smart City Act aimed at activating new services; and lastly, by expanding the national data analytics R&D and policy support.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.27 no.4
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• pp.369-376
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• 2016

In this paper, we propose and design a SSD(Simultaneous Single band Duplex) system using 5G(Generation) candidate modulations. Especially, we consider HPA(High Power Amplifier) nonlinearity in the proposed system. And then, we evaluate and analyze performance of the proposed system. As simulation results, performance of SSD-OFDM(Orthogonal Frequency Division Multiplexing), SSD-FMC (Universal Filtered Multi-Carrier), and SSD-FBMC(Filter Bank Multi-Carrier) is severely degraded by HPA nonlinearity. However, performance of SSD-OFDM, SSD-UFMC, and SSD-FBMC is similar in the same condition. That is, OFDM, UFMC, and FBMC have a similar PAPR(Peak to Average Power Ratio) characteristic. Finally, we can confirm that the proposed SSD system can not cancel(SI) self-interference effectively by strong HPA nonlinearity. That is, Reducing PAPR is important in order to avoid effect of HPA nonlinearity in the proposed SSD system.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.8 no.6
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• pp.77-88
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• 2008

This paper addresses the implementation of FTTH system based on G-PON technology. This system supports the duplication function that can switchover both TDM and data routes within 10msec. This system consists of OLT and ONU/ONT. G-PON OLT supports the maximum 32 2.5Gbps interfaces, and then has the flexibility and the scalability for supplying digital communication and broadcasting convergence service in the near future. OLT system consists switch module, subscriber module, processor module, and G-PON link module, and has the operating system based on Linux. ONU is installed in customer premise to supply TPS (Triple Play Service). Also ONT has the dedicated interface for IP-TV to improve the transmission characteristics of IP-TV signal.

• Journal of Satellite, Information and Communications
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• v.12 no.3
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• pp.8-14
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• 2017

In 4G mobile communication, data services of mobile communication began to be provided in earnest. As a result, services such as the internet and multimedia including the video have become the main contents in the recent wireless traffic. Accordingly, research on 5G mobile communication with higher transmission rate has been actively carried out. 5G mobile communication is expected to be based on 4G for compatibility with existing terminals. Therefore, the simulation of this paper is based on 4G and we propose a new user scheduling scheme based on the Max throughput scheduling algorithm to improve system performance. This paper derives the frequency efficiency and fairness to compare the existing user scheduling algorithm with the proposed user scheduling algorithm. The proposed scheme shows better frequency efficiency and fairness than Max throughput in all situations. This paper contributes to the research for improving the system performance of 5G mobile communication technology, and I hope that it will help some of the ongoing standardization work.