• International Journal of Contents
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• v.4 no.3
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• pp.29-34
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• 2008

Fast handover is essential to support seamless multicast service in MIPv6. To reduce handover latency of multicast, there are two handover mechanisms, one is M-FMIP that prepares fast L3 handover before L2 handover and the other is M-HMIP that performs local area mobile multicast management. This paper proposes M-FHMIP that integrates an advantage of M-FMIP and M-HMIP, and analyzes the multicast handover latency.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.9A
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• pp.838-849
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• 2005

Fast handover protocol provides seamless handover in mobile Ipv6 networks by reducing handover latency. This paper proposes FMIP-M mechanism to apply this advantage of fast handover protocol to multicast service. The FMIP-M is a fast handover mechanism that supports a reliable multicast service in mobile Ipv6 networks. When hosts move other networks, they may have seine data missing and out-of-synch problems of multicast data. The proposed mechanism provides reliable multicast transmission by compensating data losses from the previous AR. Also it provides an additional function that is able to change multicasting service types dynamically in accordance with network status related with multicasting. So that it is able to make multicast paths very close to the optimum and more efficient multicast service is possible. The performance of the proposed mechanism is evaluated by a time analysis and simulations in various conditions.

• The KIPS Transactions:PartD
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• v.9D no.4
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• pp.571-578
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• 2002

In temporal database, extended time dimension for history management brings about complexity of join operation and increased cost. To solve this problem, a method that joins the divided segment time data after partition the time range into fixed time interval is introduced. But existing methods can't solve the ambiguity problem of time border that caused by temporal granularity in the partition point. In this paper, We suggested Fuzzy Minimum Interval Partition (FMIP) method that introduced the possibility distribution of fuzzy theory considered uncertainty time interval border in the partition line.

• 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.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37C no.12
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• pp.1303-1309
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• 2012

In this paper, we propose a handover scheme for seamless mobile multicast service in next generation access networks. For this, we drew optimum handover scheme when applying MIP(mobile IP), FMIP(Fast MIP), HMIP(Heterogeneous MIP), PMIP(Proxy MIP) to XG-PON1. And, we analyze handover scheme for seamless mobile multicast service in XG-PON1. The prosed handover scheme remove tunnel convergence and reduces handover delay, packet delivery cost.

• Information and Communications Magazine
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• v.24 no.4
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• pp.106-115
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• 2007

본 고에서는 IP 핸드오버를 지원하기 위한 기존 프로토콜들을 망기반(network-based) 핸드오버 기법과 종단간(end-to-end) 핸드오버 기법으로 분류하여 비교 분석한다. 망기반 핸드오버 기법에는 FMIP (Fast handover for Mobile IP)와 NETLMM(Network-based Localized Mobility Management) 프로토콜이 있으며, 종단간 핸드오버 기법에는 SCTP 프로 토콜과 SIP 프로토콜을 활용하는 방법이 있다. 차세대 통신망에서는 다앙한 망환경 및 응용서비스가 혼재할 것으로 전망되며, 각기 특성에 따라 망기반 핸드오버 기법과 종단간 핸드오버 기법이 적용될 것으로 예상된다.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.110-113
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• 2017

현재 핸드폰 등 모바일 기계들의 사용의 증가에 따라 모바일 소비자는 매년 증가하고 있다. 현재뿐만이 아니라 미래까지 계속 증가 할 것으로 예상한다. 그래서 사용자의 지속적인 서비스 사용을 위해 사용 서비스를 고려한 단말 이동성대한 여러 가지 연구가 꾸준히 증가하고 있다. 이동성 지원을 위해 MIP, FMIP, PMIPv6등과 같은 여러 가지 솔루션들이 제안이 되었다. 이러한 연구들을 발전을 하는 형태의 연구들도 진행하고 있는 중이다. 하지만 이러한 솔루션들은 여러 가지 문제점을 가지고 있다. 본 논문은 여러 가지 문제점 중에 Controller 내부에서는 여러 가지 원인으로 오버헤드에 대해 초점을 두고 있다. 본 논문에서는 이러한 오버헤드를 줄이기 위해 Controller에 불필요한 flow들을 구별을 하는 기능을 하는 Controller application을 가진 기존과 다른 형태의 SDN 기반의 PMIPv6 구성을 제안한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.8B
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• pp.1159-1169
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• 2010

This paper introduces the mobility-adaptive QoE provisioning solution. The key is placed on the intelligent selection of access network depending on the QoE criteria classified by the user mobility and the bandwidth demand for service. We further focus on the network-based smart handover scheme using the mobility-adaptive handover decision and the enhanced MIH-FMIP framework. The concept is the network-based calm service and the balance in order to facilitate vertical and seamless handover. In result, it is figured out that our solution improves QoE performance by selecting appropriate access network, repressing handover occurrence, and reducing handover delay as well.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.1340-1343
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• 2008

최근 인터넷기반의 멀티미디어 서비스의 발전에 힘입어 기존의 IP망을 코어 네트워크로 사용하는 이종망간의 통합서비스가 주를 이루고 있다. 이에 따른 사용자들의 요구로 고품질 멀티미디어 데이터 서비스 지원의 QoS와 멀티미디어 서비스를 끊김없는 이동성(Seamless Mobility)에 대해서 지원할 수 있는 핸드오버기법이 필수적이게 되었다. 이중 끊김없는 이동성 지원하기 위해 MIP(Mobile IP)기법이 제안되었고, 이를 향상시킨 FMIP(Fast Handover for. MIP), HMIP(Hierarchical MIP) 그리고 PMIP(Proxy MIP)까지 제안되었다. 본 논문에서는 IMS망의 P-CSCF의 SIP프로토콜과 PMIP핸드오버 기법을 연동하는 PTSA(PMIP To SIP Agent)를 두어 IMS망에서 적용할 수 있는 향상된 PMIP 핸드오버 기법을 제안한다.

• Journal of KIISE:Information Networking
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• v.32 no.5
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• pp.603-614
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• 2005

The wireless LAN environment using Mobile IP is constructed and managed to be connected with Ethernet based wired networks. However, there have been many problems with wireless networks using Mobile IP. Some important facts on network performance have not been considered when introducing wireless LAN by Mobile IP to wired networks. In this paper, we suggest schemes which can solve problems on Handover latency caused by the asymmetrical connectivity of the Access Router at applying the HMIPv6 and on binding updates due to the MN frequent movement. Our proposed schemes can reduce network latency by using the HMIPv6 architecture with a virtual router layer, and reduce communication overhead by interchanging information of the MN movement between routers. Our schemes are expected to assist in constructing a more real and effective wireless LAN environment based on the HMIPv6 and FMIP.