• Information and Communications Magazine
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• v.31 no.2
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• pp.112-114
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• 2014

현재의 4세대 이동통신은 스마트 단말의 급속한 보급과 다양한 모바일 서비스로 인한 트래픽 폭증으로 사업자에게는 망 유지 및 시설 추가의 부담이, 이용자에게는 서비스 품질 저하의 문제가 나타나고 있다. 이를 해결하기 위한 방안의 하나로 제시되고 있는 단말간 직접통신 기술은 기지국을 경유하지 않고 단말간 직접통신을 가능하게 하는 신개념의 이동통신 기술이다.

• The KIPS Transactions:PartC
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• v.16C no.6
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• pp.691-698
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• 2009

A mobile communication device is a small size of portable computer which provides communication service, such as smart phone and PDA. Currently, one of the biggest barriers in developing the mobile communication device is security issue. Even though there are excellent security functions which can remove the security issues, there is a problem that the mobile communication device can not be loaded with all the functions because it has low storage, poor computational power, and inconvenient user interface, compared to the desktop personal computer. This paper proposes a context-aware security reconfiguration scheme for effective security management of the mobile communication device. The scheme can provide the mobile communication device with the optimized security service which is most adapted to its current security context. Through the prototype implementation and the experiments of the proposed scheme, we have confirmed that the proposed scheme is excellent in terms of computing resource efficiency and usability, without degrading security level.

• Information and Communications Magazine
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• v.28 no.8
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• pp.34-41
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• 2011

최근의 스마트폰의 보급으로 높은 전송률의 다양한 멀티미디어 서비스가 요구되는 추세이며, 이러한 사용자 단말의 서비스 품질을 보장하기 위해 작은 셀 반경을 갖는 많은 기지국들이 필요하게 되었다. 작은 셀 반경을 통해 사용자 단말과 송신기 사이의 거리를 줄이려는 노력과 더불어 릴레이협력 통신을 통해 전송률을 높이고 수신 성능을 높이려는 연구가 활발하게 진행되고 있다. 본 논문에서는 사용자 단말들이 불규칙하게 분포되어 있는 셀룰라네트워크 환경에서 사용자 단말간 협력 통신을 통한 성능 이득을 고찰한다.

• Information and Communications Magazine
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• v.25 no.3
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• pp.53-59
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• 2008

본고에서는 차세대 이동통신 단말 기술에 대해서 알아본다. 차세대 이동통신망은 새로운 4세대 이동통신뿐 만 아니라 기존의 3세대 셀룰라 이동통신, 와이브로, 무선랜 등의 다양한 무선 액세스 시스템이 공존하는 형태로 발전하며 서비스 또한 통신, 방송, 인터넷 접속 등이 다양하게 융합되는 형태로 전개될 것으로 예측된다. 이와 같은 차세대 이동통신망 환경에서의 단말은 다양한 무선 액세스 시스템에 접속이 가능하도록 멀티-모드/멀티-밴드를 지원하며 사용자에게 고속의 멀티미디어 서비스를 제공하는 올-인-원 형태의 단말로 발전할 것으로 전망된다. 이를 위하여 차세대 이동통신 단말은 고속의 무선 전송 기술, 다양한 무선 액세스 기술을 수용할 수 있는 플랫폼 및 핸드오버 기술, 그리고 다양한 장치 기술 상의 발전을 필요로 한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.6 no.3
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• pp.410-415
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• 2002

This paper describes the implementation of a SoC(System-on-a-Chip) and an ISDN communication terminal by the SoC in ISDN network. The SoC has been developed with the functions of 32-bit ARM7TDMI RISC core processor, network connection with S/T interface, TDM--bus interface and voice codec, user interface. And we also review the developed software structure and the ISDN service protocol procedures which are working on the SoC. And finally this paper describers a structure of an ISDN terminal equipment using the implemented SoC and terminal software.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.813-816
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• 2013

National Radio Research Agency(RRA) has legislated technical regulations of telecommunication equipments. These technical regulations are related to safety of operators and users, service quality, accessibility for the disabled, interoperability and network connection of terminal equipment. Also, RRA drives the establishment or amendment of technical regulations for terminal equipment considering the evolution of ICT technicology and diversification of services. In 2013, RRA researched the amendment of technical regulations in relation to terminal equipment, which are related to the measurement frequency for signal band power, unwanted signal power, pulse shape.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2006.06a
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• pp.185-189
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• 2006

최근 ESN과 IMSI 불법복제에 의해 IS-95/cdma2000 이동통신 서비스 정상가입 사용자와 단말의 피해가 확인되고 있다. 이는 정상 가입자의 요금증가, SMS를 통한 휴대폰 결재, 정상단말의 착발신 장애 등의 문제를 일으키고 있다. 이러한 불법복제 단말의 서비스 접근과 정상단말 신원확인을 위해 이동통신 사업자는 파워온 등록, 착신, 발신시에 인증 메커니즘을 적용하지만, 여전히 CDMA/cdma2000 시스템에는 취약점이 존재하는 것으로 분석되고 이의 대응책이 요구된다. 이에 본 논문에서는 파워온 인증, 발신인증, 착신인증이 도입된 이동통신 시스템에서 정상단말과 불법복제 단말이 동일 기지국내에 위치할 때와 서로다른 기지국에 위치할 때, 각각 불법복제 단말에 의해 발생할 수 있는 취약점과 대응방안을 분석하고자 한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.10
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• pp.1986-1993
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• 2015

We investigate the optimal resource and power allocation for device-to-device (D2D) communications in a multicell environment. When D2D links reuse the cellular radio resources, each D2D user will interfere with a cellular link and other D2D links, in its own cell as well as in adjacent cells. Under such situation, we propose a coordinated resource allocation scheme that can handle the intercell interferences as well as the intracell interference. For a given resource allocation, we also formulate a power optimization problem and present an algorithm for finding the optimal solution. The resource and power allocation algorithms are designed to maximize the achievable rate of the D2D link, while limiting the generated interference to the cellular link. The performance of the proposed algorithms is evaluated through simulations in a multicell environment. Numerical results are presented to verify the coordination gain in the resource and power allocation.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.11
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• pp.2135-2142
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• 2007

Mobile device will be able to use the various contents from the advancement of the wireless Internet and mobile device manufacture technique. Each devices is HTTP headers about under using provides device information to contents provider in the provide the contents. However, There is no standard for device information provided, so interoperability problems, because external contents using mobile phone companies to provide the device information in a different way. International Organization for Standard OMA UAProf about under using it solved interoperability problems from outside. However, in using the UAProf can not provide for the complete device information, because MMS support information, smart card support, information and support for external storage is not specified. Thus, In this paper, we designed UAProf in base which provides the contents which has become optimize to the mobile device of domestic environment the mobile device description language which expresses device information which is necessar, and it used to design and implementation of the Contents Adaptation System.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.22 no.3
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• pp.527-533
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• 2018

Recently, the device-to-device (D2D) communication has been conceived as the key technology for the next-generation mobile communication systems. The neighbor discovery in which the nearby users are found, is essential for the proper operation of the D2D communication. In this paper, we propose new neighbor discovery scheme based on deep learning technology which has gained a lot of attention recently. In the proposed scheme, the neighboring users can be found using the uplink pilot transmission of users only, unlike conventional neighbor discovery schemes in which direct pilot communication among users is required, such that the signaling overhead can be greatly reduced in our proposed scheme. Moreover, the neighbors with different proximity can also be classified accordingly which enables more accurate neighbor discovery compared to the conventional schemes. The performance of our proposed scheme is verified through the tensorflow-based computer simulations.