• Journal of KIISE:Information Networking
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• v.32 no.4
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• pp.515-524
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• 2005

As the number of the mobile nodes (MNs) increases in the networks, the signaling traffic generated by mobility management for MNs will increase explosively, and such a phenomenon will probably affect overall network performance. In this paper, we propose a novel analytical approach using a continuous-time Markov chain model and hierarchical network model for the analysis on the signaling load of representative IPv6 mobility support Protocols such as Mobile IPv6 (MIPv6) and Hierarchical Mobile IPv6 (HMIPv6). According to these analytical modeling, this paper derives the various signaling costs, which are generated by an MN during its average domain residence time when MIPv6 and HMIPv6 are deployed under the same network architecture, respectively. In addition, based on these derived costs, we investigate the effects of various mobility/traffic-related parameters on the signaling costs generated by an MN under MIPv6 and HMIPv6. The analytical results show that as the average moving speed of an MN gets higher and the binding lifetime is set . to the larger value, and as its average packet arrival rate gets lower, the total signaling cost generated during its average domain residence time under HMIPv6 will get relatively lower than that under MIPv6, and that under the reverse conditions, the total signaling cost under MIPv6 will get relatively lower than that under HMIPv6.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10c
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• pp.703-705
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• 2003

현재 인터넷 서비스의 근간을 형성하고 있는 IPv4의 가용 주소 공간의 고갈, 보안성의 결여, 그리고 멀티미디어 서비스를 위한 QoS(Quility of Service)의 필요성과 같은 요구사항을 바탕으로 차세대 인터넷 프로토콜(IPv6)로의 전환이 요구되고 있다. 본 연구 목적은 이러한 네트워크상의 이동 인터넷 환경에다 실시간 서비스를 제공할 수 있도록 SIP(Session Initiation Protocol)를 적용하여 통함 된 환경이 이전 보다 안전한 인터넷 정보서비스를 제공할 수 있도록 보안 메커니즘을 적용 하였다. 네트워크 계층과 응용 계층의 이동성 관리 모델의 통합은 전체적인 시그널링 부하를 줄이고 지속적인 통신을 위한 빠른 핸드오프를 제공한다. 즉, 본 연구는 현재 Mobile IPv6 에서 보안상 취약점으로 나타나는 문제점 및 SIP 보안 고려사항 및 이동성을 해결하기 위해 제안되는 해결방안들을 분석하고 적합한 보안 메커니즘 적용 방안을 제안 하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.7A
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• pp.597-602
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• 2005

This paper proposes an efficient multicast scheme for the hierarchical mobile IPv6(HMIPv6). If a mobility anchor point(MAP) in a new domain does not support multicasting, an entering group member cannot join the multicast group through the new MAP The group member thus keeps receiving multicast packets from its home agent(HA) using Mobile IPv6 (MIPv6). This increases the propagation delay of binding update (BU) messages. However, our scheme enables an entering group member to keep receiving packets from the old multicast MAP. It can also reduce tunneling costs, total delivery costs and handover latency. We simulated the performance of our scheme by comparing it with the seamless multicast handover in a hierarchical mobile Pv6 (M-HMIPv6) using the delivery cost and handover latency factors.

• Journal of KIISE:Information Networking
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• v.35 no.1
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• pp.46-55
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• 2008

As a mobility support for IP have studied, Internet Engineering Task Force(IETF) standardized the Mobile IPv6(MIPv6) protocol. When a mobile node moves between subnets, MIPv6 maintains connectivity to network and supports seamless communication, and these processes are called a Handover. Whenever the mobile node moves between subnets, the Handover is performed. The mobile node can not communicate during the Handover. This period is Galled Handover latency. To reduce this latency, mipshop working group standardizes Fast Handovers for Mobile IPv6(FMIPv6), but latency which the mobile node registers its new care-of address to a home agent and a correspondent node is still long. To solve this problem, we propose a scheme that the mobile node registers the new care-of address to the home agent and initiates Return Routability procedure in advance during layer 2 handover, based on FMIPv6 and IEEE 802.11. We analyze MIPv6, FMIPv6 and the proposed scheme in term of packet transmission cost during the Handover. Compared to MIPv6 the proposed scheme gains 79% improvement, while it gains 31% improvement compared to FMIPv6.

• The KIPS Transactions:PartC
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• v.12C no.5 s.101
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• pp.733-740
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• 2005

In this paper, we propose an approach to transport layer mobility support leveraging the SCTP extension dubbed dynamic address reconfiguration in IPv6 networks. Timing issues related to the end-to-end address management, and a novel error recovery mechanism associated with a handover are discussed. The proposed error recovery mechanism is analyzed and compared to that of the plain SCTP to show that it reduces the handover latency and error recovery time.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.2B
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• pp.210-216
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• 2004

This paper propose a new structure and procedure that provides fast handover for moving users, who are using real-time applications, in next generation IP networks. This paper also show the excellency of proposed scheme with the delay analysis. The analysis shows that the delay of proposed scheme is lower than existing methods, especially in the situation where the delay between MAP and AR is considerable.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.6B
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• pp.411-419
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• 2008

As the set of new mobile data networking service technologies, such as WiBro, mobile WiMAX and WCDMA-HSDPA, have been introduced in recent years, IP mobility management protocols which aim to provide seamless IP service over the mobile networking environment become one of the important building blocks for the successful mobile networks. IETF has introduced a basic mobility management protocol over IPv6 (MIPv6) and a set of enhanced protocols such as FMIPv6 and HMIPv6, followed by FHMIPv6, S-MIPv6 and HIMIPv6 which combine the benefits of the basic protocols. We have studied the impact of the various IP mobility management protocols over TCP sessions through extensive simulations with ns-2. Our simulation results show that TCP performance with the HIMIPv6 outperforms MIPv6, FMIPv6 and HMIPv6 over the various TCP protocols, due to its efficient combination of the hierarchical mobility management scheme of the HMIPv6, the predictive handover scheme of the FMIPv6 and the fast simulcasting scheme of the S-MIP.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.631-634
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• 2011

IETF(Internet Engineering Task Force)는 신속하고 안전한 이동성 서비스를 위하여 네트워크 자원의 사용을 안전하게 하고 법적으로 보장하는 핵심기술 같은 많은 의미있는 작업들을 해오고 있으며 기존의 MIPv6(Mobile IPv6)에서 핸드오버 지연과 시그널링 오버헤드 같은 문제를 보완하기 위하여 HMIPv6(Hierarchical Mobile IPv6)를 제안하였다. 현재 HMIPv6에 관한 연구의 대부분은 HMIPv6와 AAA(Authentication, Authorization, Accounting) 프로토콜 사이의 상호작용 절차를 최적화하기 위한 방법에 초점을 맞추고 있다. 해당 논문에서는 AAA 절차에서 인증대기를 최소화하는데 중점을 둔 비용효율적인 계층 인증 기법을 제안한다. 이 기법에서는 MAP(Mobility Anchor Point)에 배포되어진 AAA 서버들, 그리고 홈 도메인 안에 있는 AAA 서버를 대신하는 브로커들의 계층적 AAA 아키텍처를 제안한다. 이 시뮬레이션 결과는 제안된 기법이 이전의 전통적인 인증 조합 모델링과 비교하여 핸드오프 지연과 인증대기 시간이 상당히 줄어들었음을 보여준다.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04a
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• pp.682-684
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• 2004

최근 유비쿼터스 혁명으로 인해 장소 및 통신기기에 제약 없이 정보를 주고받는 환경으로의 요구가 증대되고 있다. 이러한 요구를 충족하고자 IP 계층에서 투명한 이동성을 제공하는 차세대 무선 프로토콜인 Mobile IPv6 기술이 필수적이다. 그러나 기존 Mobile IPv6는 제한된 컴퓨팅 능력을 가진 소형 이동 단말에는 탑재할 수 없다는 문제점이 있다. 이를 해결하기 위해서는 Mobile IPv6를 하드웨어 모듈로 구현하는 것이 필요하고, 이와 더불어 무선 환경을 지원하기 위해서 무선랜 MAC 기술의 하드웨어 구현이 요구된다. 이에 본 논문에서는 Mobile IPv6 모듈이 무선랜을 지원할 수 있도록 IEEE 802.11 MAC 모듈을 하드웨어로 설계 및 구현하였다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.11 s.353
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• pp.25-34
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• 2006

In this paper, we propose the new Cellular Ethernet System that supports faster handovers than IP layer handover scheme for WiBro Networks and analyze the performance of the proposed scheme. In WiBro Networks, it is very important for service providers that supports fast handovers for mobile users who want superior service. But in case of Mobile IPv6, which supports IP layer handovers, there exists very long latency for detecting movement and duplicated IP address. And besides, handovers in wired area must be carried out after completing handovers in wireless area. So, Mobile IPv6 cannot provide superior service to mobile users. To remedy these problems, we here propose the new Cellular Ethernet System that consists of MAC layer bridges for WiBro Networks and analyze the performance of Cellular Ethernet System handover scheme and show that it has better performance than Mobile IPv6.