• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.401-405
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• 2003

Mobile IP is proposed to support IP mobility by IETF. In this article we proposed to minimize delay and packet loss during the handoff by using of fast handoff mechanism. we analyzed performance of basic handoff and proposed handoff by using ns-2 simulator. This proposed mechanism can used the base of research to support efficient handoff under Mobile IPv6 Environment.

• Journal of Internet of Things and Convergence
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• v.2 no.4
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• pp.41-47
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• 2016

The IP address used in the Internet has the role of both identifier and locator to bind a host and the application, however, this binding restricts some functions such as mobility and multi-homing. As a result, we suggested a host ID-LOC separation protocol using DHT with SDN features. The proposed scheme is a network-based scheme, and uses IPv6 addresses. The underlying network is partitioned into Host Identity domain and IP domain for identifiers and locators. In this paper, we present a simple cost model for analyzing both the proposed scheme and one of the previous works, the MOFI. The result of cost analysis shows better performance of the proposed scheme.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.05a
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• pp.1276-1278
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• 2007

무선 네트워크 기술의 발전과 이동성 지원에 대한 사용자의 요구가 증대됨에 따라 모바일 IPv6와 이를 확장한 NEMO (NEtwork Mobility) Basic Support 프로토콜이 등장하였다. 이동네트워크들이 중첩되어 구성될 경우 NBS (NEMO Basic Support) 프로토콜을 사용하는 네트워크에서는 패킷이 네트워크를 구성하는 이동라우터(MR, Mobile Router)의 홈에이전트(HA, Home Agent)를 모두 거치면서 중첩 터널링이 수행되는 핀볼라우팅 문제가 발생한다. 본 논문에서는 이러한 문제점을 해결하기 위해 중첩된 이동네트워크에서 새로운 라우팅 헤더를 사용한 경로최적화 기법을 제안한다. 제안하는 기법은 새로운 IPv6 라우팅 헤더 DH (Destination-information Header)를 정의하고 이를 라우팅 헤더 타입 2를 대신하여 사용함으로써 중첩된 이동네트워크에서의 경로최적화를 구현한다. 이 기법은 기존 기법에 비하여 최적화된 경로로 통신하여 최소 32% 뛰어난 성능향상을 확인할 수 있다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.1
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• pp.219-236
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• 2014

In this paper, we propose a novel Proxy Mobile IPv6 network bandwidth-efficient handoff scheme. MN are classified into slow and fast one. At first MN should be registered in the microcell for bandwidth efficient handoff scheme. microcell is overlapped to handle the overflow session request which is nested. Overflow session request in macrocell requests to go back from the boundary of the microcell to new microcell. If idle session traffic is in a cell, it is requested by the target microcell. Analysis model was developed, an existing session of the session blocking probability and forcing termination probability of the session request have improved considerably. If the total traffic load of the system is not very large, the proposed scheme has the best bandwidth efficiency and provides better quality of service (QoS) to MN without costs of a lot of processing on the system.

• Electronics and Telecommunications Trends
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• v.22 no.6
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• pp.33-39
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• 2007

최근 IETF Network-based Local Mobility Management(NetLMM) WG에서 표준화 작업을 진행하고 있는 망 기반 이동성 제공 기법은 기존의 단말 기반 이동성 제공 방식의 단점을 극복하기 위해 제안된 방식으로, 현재 Proxy Mobile IPv6(PMIPv6)를 WG 공식 프로토콜로 채택하여 표준화를 진행하고 있다. PMIPv6에서는 단말이 이동함에 따라 이동 정보를 관리하기 위해 필요한 시그널링을 망 내부의 장비가 대신 수행한다. 본 고에서는 NetLMM WG에서 진행하고 있는 망 기반의 IP 이동성 제공 기술의 기술 개요 및 표준화 동향에 대해 알아보고, PMIPv6 프로토콜의 동작 절차와 WG의 향후 추진 계획 등을 살펴본다.

• Journal of Communications and Networks
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• v.7 no.2
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• pp.178-191
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• 2005

Fourth-generation (4G) wireless networks will be the IP-based cellular networks integrating Internet with the existing cellular networks. Two important issues should be concerned in the IP-based cellular networks, IP mobility, and quality-of-service (QoS) guarantees. In this paper, we proposed two mechanisms to solve the problems with IP mobility and RSVP-based QoS provisioning. First, virtual-IP (VIP) allocation scheme in areas with a large rate of handoff can minimize the wireless signaling overhead due to IP mobility. The access routers (ARs) create dynamically the VIP zone by using the measured handoff rate derived from the history of the handoff into neighboring ARs. We show that VIP allocation scheme reduces the binding update messages in the wireless link than hierarchical mobile IPv6. Second, the new advance resource reservation protocol called proportional aggregate RSVP (PA-RSVP) can minimize waste of bandwidth and soft state refresh overhead due to IP mobility. It allocates the bandwidth in advance between the mobility anchor point and neighboring ARs using proportional aggregate reservation. We also show that PA-RSVP provides an improved performance over existing protocols.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.7B
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• pp.991-1000
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• 2010

The Hierarchical Mobile IPv6 (HMIPv6) has been proposed to accommodate frequent mobility of the Mobile Node. HMIPv6 can effectively reduce the signaling overhead and latency. However, it has a problem that the registration of a mobile node concentrates on the furthest MAP(Mobility Anchor Point) when the mobile node enters into a new domain. This paper proposes a new load distribution mechanism by using the concept of Nash Bargaining Solution. The main advantage of the proposed scheme can prevent load concentration from being registered to the specified MAP based on the weight value according to the available resource-ratio of a MAP. With a simulation study, the proposed scheme can improve network performance under widely diverse traffic load intensities.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.736-739
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• 2011

IP 기반의 센서 네트워크인 6LoWPAN 은 IEEE 802.15.4 표준에 IPv6 를 적용하기 위해 제안되었다. 현재 IPv6 상에서 노드의 이동성을 지원하기 위한 기술로 MIPv6 와 PMIPv6 가 표준화 되었다. 6LoWPAN 에서 이동성을 지원하기 위해서 PMIPv6 를 적용하는 것이 MIPv6 를 적용하는 것보다 더 효율적이다. PMIPv6 기술의 특징은 기존의 MIPv6 에 비해 노드가 바인딩 메시지를 처리하지 않는 점이다. 따라서 노드의 부하를 줄일 수 있기 때문에 6LoWPAN 에 적합하다. 하지만 6LoWPAN 노드의 하드웨어적인 제약 사항을 고려해 볼 때, 기존의 PMIPv6 를 그대로 적용하기에는 무리가 있다. 그대로 적용한다면 PMIPv6 은 원 홉에 기반하고 있기 때문에 멀티 홉에 기반한 6LoWPAN 에는 적합하지 않다. 또한 기존에 정의되어 있는 RS 나 RA 메시지의 크기로 인해 멀티 홉 경로상의 각 단말에 많은 부하를 줄 수 있다. 본 논문에서는 위의 문제점을 해결하기 위해 6LoWPAN 에 적합한 RS 와 RA 메시지를 제안한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.7B
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• pp.628-640
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• 2004

The demand for next generation networks can be condensed into always-best-connected, ubiquitous, mobile, all-lP, and converged networks. IPv6 has been introduced for all-IP ubiquitous communications, and vehicles are coming to represent an important communication platform. In this paper. we propose various resource management schemes for in-vehicle mobile networks, which are adaptive to different hardware configurations. We focus on power and wireless bandwidth since they are critical resources for mobile communications. Based on the mobility characteristics of in-vehicle networks, we propose vehicle-aware power saving schemes. The main idea behind these power saving schemes is to adjust mobile router (MR) advertisement interval and binding lifetime. In addition, according to different wireless environments, we propose adaptive bandwidth management schemes using multihoming: best-connected MR selection based on location, and high-data-rate MR selection based on priority By mathematical analysis, it is shown that our schemes save power prominently for both the dormant nodes and active nodes. In addition, simulation results show that proposed multiple mobile router architecture outperforms previous simple redundant router architecture in preserving session and providing sufficient bandwidth.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.48 no.12
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• pp.9-16
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• 2011

Most of the current mobility management protocols such as MIPv4/6 and its variants standardized by the IETF do not support global seamless handover. This is because they require comprehensive changes of the existing network infrastructure. In this article, we propose a simple mobility management protocol (SMMP) which can support global seamless handover between homogeneous or heterogeneous wireless networks. The idea is that the SMMP employs separate location management function as done in SIP to support global user and service mobility. In addition, the bidirectional tunnels are dynamically constructed to support seamless IP mobility by extending the IEEE 802.21 MIH standards. The detailed architecture and functions of the SMMP have been designed. Finally, the simulation results, using NS-2, show that the proposed SMMP outperforms the existing MIPv6 and HMIPv6 in terms of handover latency, packet loss, pear signal noise ratio (PSNR).