• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.10a
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• pp.438-440
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• 2010

As market expansion and demand for smart phone have increased, the wireless data trafic is rapidly growing now. To solve this problem, common carriers in Korea distribute the trafic over Wi-Fi. Smart phones have multi interfaces such as 3G radio, Wi-Fi, Bluetooth, and etc and can utilize them. However these interfaces support seamless handover between not different interfaces but same interfaces, so that users couldn't be supported continuity for handover. In this paper, we describe the Media Independent Handover(MIH) services that is proposed by IEEE 802.21. The standard enhance the handovers across heterogeneous access networks and to optimize the service continuity during handovers.

• Information and Communications Magazine
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• v.33 no.10
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• pp.31-38
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• 2016

IEEE 802.21 워킹그룹은 이종 망간 핸드오버인 매체독립 핸드오버뿐만 아니라 라디오 자원 관리 등의 다양한 이종 망 연동이슈를 해결하고자 매체독립 서비스 프레임워크 표준과 이 프레임워크를 기반으로 한 활용사례들에 대한 표준으로 분리하여 표준화를 추진하고 있다. 본 고에서는 IEEE 802.21 워킹그룹의 표준화 동향 및 매체독립 서비스 기술에 대해 알아본다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.5
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• pp.1702-1707
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• 2010

As quantities of the data that transmitting by the wireless are more increased, the interest and application are extending about 802.11n that uses by combination two existing 20MHz wireless LAN Channel. 802.11n use dual band of 2.4GHz band and 5.8GHz. So this is expected in mass wireless transmission method because of interference evasion effect in compliance with the radio communication of existing 2GHz neighborhood band. Like this 802.11n uses the radio as well and transmits information there is not only a possibility of undergoing an influence in radio wave environment of circumference. Specially the interior environment and outdoor environment is a possibility of saying that will be defined with each other different modeling as affects in radio communication is different. In this paper, we'll compare the influence to RF feature (802.11n) by (Indoor/Outdoor) environment difference through compared with 802.11n RF feature and Network feature in (Indoor/Outdoor) environment and also examine the correlation between RF feature and Network feature.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.32 no.8A
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• pp.802-812
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• 2007

A Fast handover protocols for Mobile IPv6 networks can support seamless service by reducing handover latency to mobile nodes. To gain advantage derived from the fast handover in IEEE 802.16e networks, we propose a new fast handover protocol using a multiple simultaneous binding mechanism and a handover protocol based on trigger event for IEEE 802.21 in order to integrate IEEE 802.16e handover protocol and FMIPv6 handover protocol using link layer trigger. Through the numerical analysis, we compare performance of the proposed protocol and FMIPv6 protocol.

• Electronics and Telecommunications Trends
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• v.25 no.1
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• pp.114-123
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• 2010

멀티모드 휴대 단말의 보급이 본격화되고 다양한 유무선 통신 인프라가 확대됨에 따라 이기종 네트워크 간의 핸드오버 서비스가 무엇보다 요구되는 시점이다. IEEE 802.21 WG에서는 이기종 네트워크간 심리스한 수직 핸드오버 서비스를 목적으로 MIH 표준 기술을 발간하였고, 최근에는 MIH 기술을 방송 네트워크로의 핸드오버를 위해 사용하도록 추가적인 표준화 작업을 진행하고 있다. 본 글은 이기종 네트워크간의 수직 핸드오버 서비스에 효과적으로 사용될 수 있는 IEEE 802.21 MIH 표준의 주요 핵심 기술 및 표준화 현황에 대해 알아보고 통신 네트워크와 방송 네트워크 간의 핸드오버 서비스 제공을 위해 최근 IEEE 802.21 WG 산하에 생성된 IEEE 802.21 TGb의 표준화 진행사항에 대하여 정리해 본다.

• Electronics and Telecommunications Trends
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• v.22 no.6
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• pp.40-50
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• 2007

본 고에서는 이기종 네트워크 환경에서의 심리스 핸드오버 기술에 대한 기술 분석 및 관련 표준화 동향에 대하여 기술한다. 이기종 네트워크에서의 심리스 핸드오버 기술로 대표적인 IEEE 802.21 Working Group에서 표준화를 진행해온 Media Independent Handover 기술에 대한 참조 모델, 서비스, 프로토콜 및 이기종 네트워크간 핸드오버 절차를 중심으로 살펴본다. 최근 표준화 동향 파악을 위해서 2007년 10월 기준으로 IEEE 802.21 Working Group 및 IEEE 802.11u Task Group의 표준화 현황과 핵심 이슈를 정리하며, 그간 3GPP 표준과 연계한 MIH 기술 적용 현황 및 향후 추진시 고려할 사항에 대하여 기술한다. 또한, IEEE 802.21 Working Group 내 신규 그룹인 Multi-Radio Power Conservation Management Study Group과 Security Study Group의 진행상황에 대하여 살펴본다.

• TTA Journal
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• s.155
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• pp.127-129
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• 2014

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.10a
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• pp.66-69
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• 2008

As a mobility support for IP have studied, Internet Engineering Task Force(ITEF) standardized the mobile IPv6 protocol. When a mobile node moves between networks, MIPv6 maintains connectivity to network and supports seamless communication, and these processes are called a Handover. IEEE 802.21 standardized MIH(Media Independent Handover) for seamless Handover. MIH used three services for Handover between low layer and upper layer. In this paper, we designed two modes on existing MIH for seamless Handover. We implemented a dual-interface mobile host(MH) model in network simulation2 (ns2) to evaluate how it performs in comparison with single-interface MH.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.05a
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• pp.80-83
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• 2010

As the recent development of mobile technology, users want to multi-service in anytime, anywhere, any terminal. To meet the needs of users, it causes a lot of expense that redesign of the entire network or expand the network of services areas. Therefore, IEEE, IETF is offering Handover technology between Heterogeneous Network. In this paper, the IEEE 802.21 MIH Information Server is based on the network. It proposes an improved Handover that L3 layer to optimize the Handover process use of FMIPv6 and executes simulation.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.7
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• pp.1313-1319
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• 2017

In this paper, we evaluate the performance of multi-hop transmissions in IEEE 802.15.6 ultra wide band (UWB) wireless body area network (WBAN). The packet structure in the physical layer, and encoding and decoding are considered for multi-hop transmissions in IEEE 802.15.6 UWB WBAN. We analyze the data success rate and energy efficiency of multi-hop transmissions with considering the length of data payload, transmission power, and distances between the nodes in IEEE 802.15.6 UWB WBAN. Through simulations, we evaluate the data success rate and energy efficiency of multi-hop transmissions with varying the length of data payload, transmission power, and distances between the nodes in IEEE 802.15.6 UWB WBAN. Finally, we can select an energy-efficient multi-hop transmission in IEEE 802.15.6 UWB WBAN depending on the length of data payload, transmission power, and distances between the nodes.