• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.1206-1209
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• 2009

모바일 단말의 이동성을 지원하는 호스트 기반의 MIPv6, HMIPv6 및 FMIPv6 프로토콜이 개발되었지만, 이동성 기능을 단말기에 구현해야 하는 부담이 있다. 이러한 문제점을 해결하기 위해 최근에 네트워크 기반으로 동작하는 PMIPv6 프로토콜이 등장하였다. 그러나 라우팅 최적화나 핸드오버 지연시간을 단축해야 하는 과제가 아직 남아 있다. 따라서, 본 논문에서는 사용자의 인증절차를 간소화하여 지연시간을 줄이고, 핸드오버 시간 동안 패킷들을 LMA 의 별도 광 버퍼링 공간에 저장하였다가 재전송함으로써 패킷 disordering 문제점을 해결하는 기법을 제안한다. 성능평가는 분석 모델을 통해 평가하며, 제안기법의 핸드오버 지연시간은 표준 PMIPv6 대비 33% 개선된 성능을 보인다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.691-692
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• 2009

노드의 이동성을 지원하는 Mobile IPv6에서는 단말과 홈 에이전트 간 시그널링 처리로 인한 부하를 줄이기 위해 Proxy Mobile IPv6가 제안되었다. 그러나, Proxy Mobile IPv6 역시 서브넷 이동에 따른 재인증 프로세스로 인해 지연이 발생하며 현재까지 Mobile IPv6와는 달리 보안 취약점에 대한 분석과 그에 맞는 보안 기법이 미비한 상황이다. 본 논문에서는 현재까지의 Proxy Mobile IPv6에 대한 보안 취약점 분석을 통해 안전한 핸드오버 기법을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.1120-1123
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• 2009

다양한 기능의 휴대 단말 기기와 무선 환경의 보급으로 무선 인터넷 서비스에 대한 사용자들의 요구가 증가하고 있다. 이와 관련하여 IEEE 802.16 표준은 사용자에게 대용량 데이터 서비스를 제공하기 위한 무선 기술을 정의하고 있다. 또한, IEEE 802.16에 MS의 핸드오버 절차를 추가한 EEE 802.16e 표준 기술은 MS에 대한 핸드오버 절차를 지원하고 있다. 그러나 이러한 핸드오버 절차는 MS이 Serving BS과의 연결을 종료한 이후, 새로운 Target BS에 대한 핸드오버 절차를 수행하므로 사용자는 일시적인 데이터 전송 중단으로 인한 서비스 지연을 경험한다. 본 논문에서는 이러한 문제를 해결하고, 사용자에 대한 빠른 핸드오버 절차를 지원하기 위해 주변 BS들의 위치 정보를 MOB_NBR-ADV를 통하여 MS에게 전송하고, 이를 통해 각 BS들에 대한 MS의 접근 정도를 평가하여 특정한 BS에 대해서만 Association을 수행할 수 있는 기법을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.607-610
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• 2011

본 논문은 WiMAX 와 WLAN 네트워크 간 빠른 핸드오버를 위한 이동성 관리 방안을 제안한다. 제안방안은 MPLS 네트워크 환경을 기반으로 하고, 공용 인증키로써 MA ID(Mobility Agent Identifier)를 할당하여 핸드오버 시 재인증(Re-authentication) 및 IP 재구성을 위한 시그널링 메시지를 간소화시킨다. 따라서 이동노드가 핸드오버 할 때마다 반복적으로 요구되는 두 동작에 대한 처리가 보다 신속히 이뤄지면서 핸드오버 지연 감소의 효과를 보인다. 제안방안에 의한 성능 향상을 검증하기 위해 수식을 이용하여 기존방안과 제안방안의 핸드오버 지연을 분석하였다. 그 결과 제안방안에서의 핸드오버 지연이 기존방안 보다 더 낮음을 확인하였다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.46 no.1
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• pp.112-120
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• 2009

This paper proposes a session key distribution scheme on non-interactive key distribution algorithm of Identity-based cryptography in V2I of VANET. In the current VANET, IEEE 802.11i is used to provide secure data communication between the vehicle and infrastructure. However, since the 4-way handshake procedure reply when the vehicle handover to another RSU/AP, IEEE 802.11i increases the communication overhead and latency. The proposed scheme using non-interactive key distribution algorithm of Identity-based cryptography provided session key generation and exchange without message exchange and reduced communication overhead and latency than the IEEE 802.11i.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.4
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• pp.677-685
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• 2012

Recently, wireless multi-networking technology has been studied for supporting multi-interface in mobile node. As the related work, in the IETF NetExt WG, the extension of Proxy Mobile IPv6 protocol for supporting flow mobility is actively on going in discussion. PMIPv6 protocol supports simultaneous access through the multi-interface in a mobile node and inter-technology handover between multiple interfaces. However, this protocol can not support flow mobility. Thus, in this paper, when a mobile node connects to PMIPv6 domain through multi-interface, as a way to support flow mobility, the design of logical interface and Home Network Prefix change scheme based on logical interface are proposed, We show that the proposed scheme can perform flow mobility service without end-to-end disconnection in PMIPv6 domain.

• Journal of the Korea Institute of Military Science and Technology
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• v.23 no.3
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• pp.246-256
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• 2020

In the future Network Centric Warfare(NCW), changing to IPv6 based network environment is required to enable various future technologies such as the Internet of Things(IoT) and cloud technology which are expected to be introduced to the tactical network evolution. With the change to the IPv6 network, an ID/LOC(Identifier/Location) separation protocol that decomposes context of the IP address to location and identifier can enhance network capacity of increasing number of device and provide efficient mobility management in the tactical network that changes topology dynamically. In this paper, we choose ILNP(Identifier-Locator Network Protocol) as an ID/LOC separation for tactical network environment. In addition to ILNP-based tactical network design, this paper proposes a network-based mobility management scheme for providing efficient mobility management. Through numerical performance analysis, we show that the proposed scheme can reduce network loads more effectively than the conventional IP-based mobility management scheme and common handover procedure in ILNP.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.48 no.11
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• pp.35-43
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• 2011

In this paper, we propose a novel architecture for seamless mobility management to provide users with seamless Internet connection when users roam between diverse wireless local area networks (WLANS) controlled by different management entities. There have been many researches in IETF, i.e., MIPv6, HMIPv6, and PMIPv6, to provide the mobility management. However, practically since wireless access points or access routers, which are managed by an individual manager or ISP managers, have different authentication scheme and the supported mobility management, the previous mobility management protocol developed by IETF can not guarantee the quality of service of application services as the mobile node performs the handover. To solve this drawback, we propose the mobility management scheme to provide QoS-guaranteed Internet services during the handover by configurating the wireless networks which is defined by users. More specifically, we present a model, the architecture and an algorithm for user-defined network (UDN) to provide the seamless Internet service. Finally, the performance of the proposed algorithm is evaluated by the network simulation tool.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.20 no.4
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• pp.41-52
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• 2010

Message authentication is an essential security element in vehicular ad-hoc network(VANET). For a secure message authentication, integrity, availability, privacy preserving skill, and also efficiency in various environment should be provided. RAISE scheme has been proposed to provide efficient message authentication in the environment crowded with lots of vehicles and generally considered to be hard to provide efficiency. However, as the number of vehicles communicating in the area increases, the overhead is also incurred in proportion to the number of vehicles so that it still needs to be reduced, and the scheme is vulnerable to some attacks. In this paper, to make up for the vulnerabilities in dense vehicular communication network, we propose a more secure and efficient scheme using a process that RSU(Road Side Unit) transmits the messages of neighbor vehicles at once with Bloom Filter, and timestamp to protect against replay attack. Moreover, by adding a handover function to the scheme, we simplify the authentication process as omitting the unnecessary key-exchange process when a vehicle moves to other area. And we confirm the safety and efficiency of the scheme by simulating the false positive probability and calculating the traffic.

• Journal of Internet Computing and Services
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• v.9 no.5
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• pp.175-183
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• 2008

Wi-Fi defines the procedure to search an AP, authenticate both station and AP, and associate the new BSS or ESS which enables the link layer handoff. One of the problems for hotspot service of Wi-Fi is "passing-object", Wi-Fi describes the messages exchanges between two neighboring APs in BSS or ESS. If the station passes through the neighboring APs before completing link-layer handoff, the path where the tunneled packets should be sent is lost. In this paper, we propose to integrate the positioning entity in a service domain to keep track the high-speed movement.