• 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 Korean Information Science Society Conference
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• 2003.10c
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• pp.205-207
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• 2003

AII IP망으로써의 성격을 지닌 차세대 인터넷망의 구축은 앞으로 다양한 서비스의 제공은 물론, 새로운 접속 기술의 개발을 앞당기게 될 것이다. 앞으로 제공될 서비스들은 시간에 민감하고, 대용량의 대역폭을 요구할 뿐만 아니라, 이동 중에도 적합한 서비스 품질(QoS Qualify of Service)의 보장을 요구한다. 현재, 호스트가 이동 중에 접점을 변경할 경우, 서비스의 무결절성을 보장해 주기 위해 가장 활발하게 연구가 진행되고 있는 protocol은 MIPv6(Mobile IPv6)이다. 그러나 MIPv6는 Best Effort 패킷 전송을 위해 디자인 되어 있기 때문에 QoS 보장 부분이 미약하다. 따라서 QoS 보장을 위해 IntServ에서 QoS 지원을 위해 구현된 시그널링 프로토콜인 RSVP(Resource Reservation)와의 연동에 관한 연구들이 많이 진행되고 있다. 본 논문에서는 무선 access망에서 MIPv6와 RSVP를 기반으로 MN(mobile node)에게 서비스를 제공 해줄 수 있는 여러 AR(Access Router)들로부터 정보를 받아 저장하고 가장 적합한 AR을 찾는 방법을 제안한다. 이를 통해 라우터의 가용 자원에 따라 MN이 접점을 이동한 경우 적절한 AR로 빠른 핸드오프가 가능하여 핸드오프 시 발생되는 지연 시간(latency)을 감소 시켜 줄 수 있다.

• The KIPS Transactions:PartC
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• v.10C no.6
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• pp.755-762
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• 2003

For the route optimization in the MIPv6, MN(Mobile Node) sends CN(Correspondent Node) a binding update message to notify the binding of is HoA(Home Address) with its new CoA(Care-of Address). However, unautenticated binding updates expose the involved MN and CM to various sucurity attacks. Thus, protecting the binding update process becomes of paramount importance in the MIPv6, and several secure binding update protocols, and the performance of packet exchanges and cryptographic operations. Then, we analyze the four typical binding update protocols based on the presented criterions. In addition, we propose some improvement tips for secure binding updates.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.2
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• pp.277-284
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• 2009

With significant development in wireless communication technologies, the needs to handover from one network to another have grown dramatically. Recently IETF developed MIPv6 and FMIPv6 which are used to handover between different access networks. These handover mechanisms have some known weaknesses. MIPv6 can not serve time-critical application because it causes long handover latency and packet loss. By these reasons, MIPv6 does not guarantee session continuity. FMIPv6 uses handover preparation phase to reduce DAD latency. However FMIPv66 still suffers from long handover latency, because it must perform binding update at the end of handover procedure. In this paper we propose new handover mechanism FMIPv6-PBU which eliminates binding update latency. The proposed mechanism has compatability with lagacy FMIPv6. In this paper propose FMIPv6-PBU handover procedure and explain its procedures and evaluate it with MIPv6 and FMIPv6.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.8 no.5
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• pp.105-111
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• 2008

Mobility support for mobile networks will be important to minimize the packet overhead, to optimize routing, to reduce handoff latency, and to reduce the volume of handoff signals. Mobile IPv6 (MIPv6) and Hierarchical MIPv6 (HMIPv6) are one of mobility management protocols (MMPs) that provides network layer mobility over all access technologies. However, the communication quality of these candidates is severely degraded during handoffs. As another way to improve the handoff performance of a mobile network by conventional MMPs such as MIPv6 and HMIPv6, we propose a Low Latency Handoff Scheme (LLHS) combining Fast MIPv6 (FMIPv6) with HMIPv6 extension with buffering function, in which Mobility Anchor Points (MAPs) buffer packets destined to the Mobile Routers (MRs) or MNs within a mobile network during handoffs. The simulation results show that the proposed scheme reduces transmission delay and packet loss in UDP communication.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.05a
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• pp.230-232
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• 2010

최근 무선 멀티 인터페이스를 이용한 동시 접속 기술에 관한 연구가 활발히 진행 중이다. 이와 관련된 연구 중 하나인 Proxy MIPv6 환경에서 멀티호밍 지원에 관한 연구가 IETF Netext WG에서 진행 중이다. 기존 Proxy MIPv6 프로토콜은 멀티인터페이스 제공 시 독립된 HNP 할당을 통해 동시 접속 서비스를 제공하고 있다. 하지만 이 방법은 이동 노드의 세션 연결성을 유지하지 못하는 문제점을 가지고 있다. 본 논문에서는 이런 문제점을 해결하기 위해 멀티호밍 되어 있는 이동 단말 내부에 가상 인터페이스 모델의 필요성과 기능에 대해서 정의하며 또한 가상 인터페이스를 통해 기존 연결성을 유지 할 수 있도록 방법을 제안하고 이에 관해 논한다.

• Journal of KIISE:Information Networking
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• v.37 no.6
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• pp.459-465
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• 2010

Mobile IPv6(MIPv6) features have several defects such as overloading of nodes, loss of wireless signals, packet loss, movement problem and so forth. Proxy Mobile IPv6 (PMIPv6) got over the limit of MIPv6 problems. MIPv6 features have several defects such as overloading of nodes, loss of wireless signals, packet loss, movement problem and so forth. Research on PMIPv6, which features network-based mobility is actively in progress in order to resolve these issues. PMIPv6 is emerging as a new paradigm that can overcome the limitations of the existing MIPv6. Nevertheless, such PMIPv6 also incurs problems during hand-over. While it offers a solution to node-based problems, it does, too, create long delay times during hand-over. Since MN (Mobile Node) has been sensing its own movements on MIPv6, fast handover can be done easily. However it can't apply fast handover like MIPv6, as it can't apply fast handover like MIPv6 In this paper, the author solved hand-over problem on MIPv6. MAG knows location information of MN and if MN moves into other MAG's area, Location Server gives MN information to the MAG. Therefore, this mechanism makes hand-over process easier.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.4B
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• pp.559-565
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• 2010

In Mobile IPv6 handover should be followed by RO(Route Optimization) to support direct communication between a MN(Mobile Node) and CN(Correspondent Node). For this RR MIPv6 must perform RR(Return Routability) procedure before BU(Binding Update) to CN. The Fast Handover for MIPv6(FMIPv6) also performs the RR test for MN to communicate with CN directly. However, Return Routability test has long latency resulting in handover delay in MIPv6. This paper proposes the method to reduce the handover deay by reducing RO latency in FastMobile IPv6.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.773-776
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• 2008

최근 WiBro, HSDPA 등의 무선 네트워크 기술의 급격한 발달과 휴대용 기기의 놀라운 성능향상으로 인해 이동 중에도 네트워크 연결성을 잃지 않기 위한 기술이 요구 되고 있다. 이러한 요구사항을 위한 IP 계층에서의 해결책을 보인 기술이 Mobile IP이다. Mobile IP 기술에는 호스트 기반의 이동성을 제공하는 MIPv6, FMIPv6, HMIPv6 등의 기술과 네트워크 기반의 이동성을 제공하는 PMIPv6 등이 IETF에서 RFC와 드래프트 문서를 통해 제시되었다. 각각의 네트워크 도메인은 이러한 이동성 관리 기술을 채택하여 이동성을 제공하는데 각 기술 간의 상호연동에 있어 몇 가지 문제점이 있다. 본 논문은 호스트 기반 이동성 관리 기술의 대표인 MIPv6와 네트워크 기반 이동성 관리 기술인 PMIPv6 간의 상호연동을 위하여 PMIPv6 네트워크를 식별하기 위한 새로운 방안을 제시하고 MIPv6와 PMIPv6가 상호연동하는 시나리오를 제시한다. 본 논문이 제안한 새로운 PMIPv6 Indication 방법과 시나리오는 이동 기기가 다양한 특성을 지닌 도메인 간을 로밍할 때 효율적으로 상호연동할 수 있다.

• Journal of Digital Contents Society
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• v.11 no.3
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• pp.341-348
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• 2010

Unlike host-based IPv6 mobility support protocols such as Mobile IPv6 (MIPv6), Hierarchical Mobile IPv6 (HMIPv6), and Fast handover for Mobile IPv6 (FMIPv6), Proxy Mobile IPv6 (PMIPv6) is expected to accelerate the real deployment of IPv6 mobility support protocol by using only collaborative operations between the network entities without mobile node (MN) being involved. In this paper, we analyze and compare the handover latency of network-based IPv6 mobility support protocol (i.e., PMIPv6) with the representative host-based IPv6 mobility support protocols such as MIPv6, HMIPv6, and FMIPv6. Analytical results show that the handover latency of PMIPv6 is considerably lower than those of MIPv6 and HMIPv6, and the handover latency of PMIPv6 becomes lower than that of FMIPv6 in case the wireless link delay is greater than the delay between mobile access gateway (MAG) and local mobility anchor (LMA).