• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.10a
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• pp.79-81
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• 2009

NEMO is technique to support mobility of a network, not a node, and ensures session continuity for all the nodes in a Mobile Network. However NEMO basic support protocol causes high handover latency, thus it is incongruent real-time services such as VoIP. One of schemes to reduce handover latency is FNEMO. FNEMO that combines conventional NEMO and FMIPv6, reduces latency during the handover, thus it supports fast handover. In this paper, we compare/analyze handover of FNEMO in heterogeneous/homogeneous network, and propose schemes to reduce handover latency.

• Proceedings of the IEEK Conference
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• 2007.07a
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• pp.189-190
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• 2007

We propose an efficient internetworking model for fast handover between UMTS and WLAN networks. Mobility anchor (MA) is provided at the boundary between GGSN and PDG, under the 3GPP-proposed internetworking reference model. Such MA can enable authentication and session initialization before L2 handover of the mobile terminal, so that seamless and fast vertical handover could be possible.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.8B
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• pp.1129-1140
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• 2010

Wireless mesh networks have been widely studied as the next generation technology to solve the problems of conventional wireless networks. Particularly, Mobile WiMAX based wireless mesh networks are noticed due to many advantages. Mobile WiMAX standard provides two kinds of layer-3 handover schemes: Mobile IP and Proxy Mobile IP based handover schemes. MIP based handover scheme has a problem in that it incurs the long handover latency because mobile nodes generate a lot of handover messages. On the other hand, PMIP based handover scheme decreases the handover latency by reducing the number of handover messages, because mobile nodes do not participate in handover procedure. Therefore, layer-3 handover for Mobile WiMAX should be designed based on PMIP. However, conventional PMIP based handover still has latency overhead, because of many message exchanges between PBU and PBA after completing the layer-2 handover. Hence, in this paper, we propose a fast layer-3 handover scheme that achieves the lower handover latency for Mobile WiMAX based wireless mesh networks. Proposed scheme has advantages in terms of handover latency. Simulation results show that proposed scheme achieves low handover latency during the layer-3 handover.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.11C
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• pp.877-884
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• 2010

This paper presents a fast IP mobility management scheme in vehicular networks where multiple wireless network interfaces are used to perform the fast handover without packet loss and handover latency. In order to do that, the IETF standard HMIPv6 has been extended, where multiple simultaneous tunnels between the HMIPv6 MAP and the mobile gateway are dynamically constructed. The architecture for supporting multiple tunnels has been designed and both mathematical analysis and simulation using NS-2 have been done for performance evaluation.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.3B
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• pp.208-213
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• 2011

Since the wireless technologies based on the IP have been developed recently, a variety of mobile services has been proposed. For broadcasting services to utilize network resources efficiently, there is a need to support handover of multicast traffic in mobile networks. In this paper, we add a network function block to solve the tunnel convergence problem, and propose a new fast handover scheme to reduce handover latency for PMIPv6 networks with multicast function. With the simulation result, we show that our fast handover scheme has better performance than the draft in the IETF in the viewpoint of handover latency and multicast service disruption.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.05a
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• pp.76-79
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• 2009

Recently there has been much effort, in both academia and industry, to integrate a plethora of wireless technologies in order to provide seamless connection to mobile users. To support seamless connection on terminal needs fast handover function and location management function. Especially, Performing fast handover has to interact with function of datalink layer and mobility based IP. In this paper, we propose a handover decision mechanism using MIH( Media Independent Handover) in hybrid networks to reduce the delay of transmission for data.

• 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.35-43
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• 2006

In this paper we have presented a network based high-speed handover protocol using NetLMM(Network based Localized Mobility Management) WG protocol in IETF(Internet Engineering Task Force). We use IEEE 802.21 MIHS(Media Independent Handover Services) for improving handover latency and we analysis proposed Fast NetLMM protocol performance using Fluid Flow Mobility Model. Evaluation results show that the Fast NetLMM protocol performance is better than other mobility management protocols.

• Electronics and Telecommunications Trends
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• v.18 no.5 s.83
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• pp.19-26
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• 2003

Mobile IPv6는 IPv6에 기반한 IP 이동성을 제공하기 위하여 IETF에서 현재 작업중인 프로토콜로서 올 연말쯤 RFC 문서화 될 전망이다. 하지만 실제로 Mobile IPv6를 구현하고 테스트해 본 결과 handover시 여러 가지 문제점이 대두되었고, 그 중의 하나가 handover delay가 서비스에 지장을 줄 정도로 크다는 것이었다. 본 고에서는 Mobile IPv6의 handover delay를 줄이기 위해서 IETF Mobileip WG에서 진행중에 있는 다양한 fast handover 기법에 대하여 살펴 본다. Mobile IPv6는 Mobile IPv4와 마찬가지로 실제 상용망에서 많이 활용되고 쓰이기 위해서는 fast handover나 QoS 지원 같은 서비스 품질을 지원하여야 할 것으로 전망된다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.447-449
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• 2003

최근 공중 무선랜 서비스와 같이 IP 기반의 액세스 망을 사용하는 네트워크 환경이 증가하고, IP를 기반으로 하는 차세대 네트워크 환경이 대두됨에 따라 IP 기반의 이동성 관리 기술의 필요성이 증가하고 있다. IP 기반의 이동성 지원을 위해 MIPv6 프로토콜이 제시되었으며, MIPv6의 핸드오버 성능을 개선하기 위한 여러 가지 확장 프로토콜이 제시되고 있다 대표적으로 계층적인 구조에서 지역 이동성을 지원하는 MAP을 도입함으로써 바인딩 갱신에 소요되는 지연 시간을 줄이는 HMIPv6와 새로운 망에서 사용될 주소를 미리 생성하고 라우터들 간의 터널을 통해 패킷을 전달함으로써 패킷 손실을 줄이는 FMIPv6이 제시되었다. 이 두 가지 프로토콜을 결합함으로써 보다 우수한 핸드오버 성능을 제공할 수 있을 것이다. 그러나 단순한 두 프로토콜의 결합은 패킷의 전달 경로를 복잡하게 하는 단점이 있다. 본 논문에서는 HMIPv6와 FMIPv6을 결합할 때 발생하는 복잡한 경로를 단순화하는 F-HMIPv6 프로토콜을 제안한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.32 no.7A
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• pp.666-671
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• 2007

EPON is proposed to be used in an infrastructure of the next generation wireless network. EPON can reduce fiber deployment cost and easily decrease the occurrence of layer-3 handover by introducing group cell concept. An EPON-based layer-2 handover algorithm is suggested for fast handover. The time-delay of the control signals are examined using simulation.