• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.12A
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• pp.964-974
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• 2003

With increasing use of a personal mobile computer. the Mobile IPv6 is one of the main protocols that support mobility and complies with IPv6 specification. Similar to the mobile IPv6, the mobile IPv6 also has limitations on fast moving condition. The Hierarchical Mobile IPv6 is a solution that overcomes these limitations. The Hierarchical Mobile IPv6 is a micro mobility protocol that supports fast mobile IP handover and reduces signaling overhead with Mobility Anchor Point(MAP). But until now no paging method is applied to the Hierarchical Mobile IPv6 to reduce unnecessary signaling overhead and power consumption of mobile nodes. So, the paging mechanism for the Hierarchical Mobile IPv6 is proposed in this paper. the mechanism is implemented by making use of the destination option header and extension function and the last location algorithm. The results show that the Hierarchical Mobile IPv6 with the paging ability reduces the traffic of mobile networks by removing unnecessary binding update packet generated whenever handover takes place. Also, the larger the paging size is. the less the number of BU(Binding Update) massage generated.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.11B
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• pp.945-952
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• 2006

In hierarchical mobile IPv6 networks, when an inter-domain handover occurs, mobile nodes suffer from excessive signaling traffic and long handover latency, resulting in possible disruption of ongoing connections. Further, the selection of MAP and its load status critically affect the overall system performance. Therefore, we propose a dynamic MAP selection scheme that seeks to distribute load among MAPs as well as reduces inter-domain handovers. Performance is evaluated from not only an analytic model of average signaling cost but also simulation. The analytical and simulation results show that our proposed scheme improves load distributedness and reduces inter-domain handovers and signaling cost compared to another existing IETF based approach.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38A no.4
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• pp.337-349
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• 2013

In this paper, we propose a new mobility management scheme, called i-FP(intelligent Fast PMIPv6). Our proposed i-FP scheme is addressed for solving the existing local mobility management problems from legacy frameworks. To move MN(Mobile Node) to other networks in one domain, i-FP employs three network entities which are extended from PMIPv6(Proxy Mobile IPv6), LMA(Local Mobility Anchor), MAG(Mobile Access Gateway) and MN. In i-FP, the three network entities can reduce the handover delay time of MNs. Also, i-FP uses an IP header swapping mechanism to avoid the traffic overhead and improve the throughput of network. To evaluate the performance of i-FP, we analyze our i-FP, HMIPv6(Hierarchical Mobile IPv6) and PMIPv6 which are legacy protocols of local mobility management in terms of various parameters. Finally, our i-FP scheme shows good performance(reduction of routing hops 10.2%, signaling costs 58.5% and handover delay 16.3%) than other network schemes for the total cost.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10c
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• pp.328-330
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• 2004

차세대 네트워크는 IP 기반의 무선 네트워크로 진화하고 있다. 이에따라 최근의 internet Engineering Task force (IETF)에서 효율적인 이동성 관리를 위한 Hierarchical Mobile IPv6 (HMIPV6)을 제안하였다. HMIPV6는 Mobile Anchor Point(MAP)영역안에 지역 등록을 통하여 상당한 시그널링을 줄일 수 있고 핸드 오프 지연시간을 줄이면서 MIPv6의 성능을 향상 가져왔다. 그러나 MAP 영역이 고정되어 있고 단일 MAP에 집중적인 트랙픽이 발생하는 문제점을 가지고 있다. 따라서 이동노드의 이동성 및 트래픽에 의해서 동적으로 MAP 영역을 설정함으로써 트랙픽이 분산되어 질수 있다. 또한 HMIPv6는 Idle 이동노드도 불필요한 위치 등록으로 인하여 시그널링 오버헤드를 방생한다. 따라서 IP 페이징 기법을 사용하여 불필요한 위치 등록에 따른 시그널링을 줄이기 위한 방법을 제시한다. 또한 explicit multicast (Xcast) 방법을 사용하여 효율적인 메시지 전달방법을 제시한다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04d
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• pp.509-511
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• 2003

최근 이동 통신 환경에서의 인터넷 서비스의 요구가 늘어남에 따라 IP의 이동성 지원에 대한 연구가 활발히 진행되어 왔다. 본 논문은 IP 이동성 지원을 위한 프로토콜 중 IETF(Internet Engineering Task Forces)에서 현재 표준화가 진행중인 HMIPv6(Hierarchical Mobile IPv6 Mobility Management)[4]가 가지는 부하 분산 문제를 수평적인 MAP(Mobility Anchor Point) 구조를 통해 해결하고, 이 구조에서의 페이징 지원 방안을 제안하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.6B
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• pp.544-550
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• 2006

Next-generation wireless/mobile networks are envisioned to have an IP-based infrastructure. One of the research challenges for next-generation all IP-based networks is the design of intelligent mobility management technologies that have a seamless mobility and minimal signaling overhead. Recently, HMIPv6 was proposed by the IETF for efficient mobility management. HMIPv6 reduces the amount of signaling and improves the performance of MIPv6 in terms of handover latency. However the MAP can be a single point of performance bottleneck when there are a lot of local movements. HMIPv6 can cause signaling overhead due to the unnecessary location update of idle mobile nodes. Therefore, in this paper, we propose the dynamic paging Mobile IPv6 that reduces the signaling cost of the unnecessary location updates using IP paging and organizes dynamically optimal MAP area according to user's mobility and traffic. We show performance results that are obtained from the average total location update cost and packet delivery cost.

• Proceedings of the Korea Contents Association Conference
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• 2006.11a
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• pp.61-64
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• 2006

As a demand of mobile network is increasing, mobile support protocols are suggested. Although HMIPv6 managing the micro mobility with MAP suggests a plan for an effectively mobile support, there has a problem of traffic concentrating. This paper propose efficient schemes of distributing the traffic concentrated on hierarchical Mobile IPv6. This proposed schemes, selecting MAP more than two, are divided by selected 'Active' and 'Passive' MAP. The proposed schemes change a state in MAP and define performance to distribute a load in MAP as the Load is occurred by traffic.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.364-366
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• 2005

인터넷의 급격한 성장으로 인해 무선 네트워크에서의 인터넷 서비스 수요가 급증하고 있다. 이에 따라 시그널링 비용의 증가와 핸드오프 지연이 네트워크의 부하를 비롯, 통신 품질 저하 등의 문제점들을 야기했고, 이를 해결하기 위해 HMIPv6(Hierarchical Mobile IPv6)와 IP 페이징 기법들이 제안되고 있다. 본 논문에서는 HMIPv6 환경에서 이동노드의 특성을 고려하여 각각의 이동노드에게 적합한 MAP 도메인과 페이징 영역을 동시에 설정하는 기법(Adaptive Dynamic scheme)을 제안하여, 이때 PAMAP(Paging Agent MAP)이라는 새로운 개념을 제시한다. 이를 통해 동적 페이징에서의 불필요한 시그널링 비용을 줄임으로써 전체 네트워크의 부하를 줄여, 궁극적으로 통신 품질의 향상을 기대할 수 있다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.32 no.7A
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• pp.746-754
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• 2007

In this paper, we propose a fast handoff algorithm for micromobility management enhancement in HMIPv6 networks, which eliminates the DAD procedure involved in the regular HMIPv6 in order to o decrease handoff latency and increase the resource utilization efficiency. In the proposed scheme, the MAP is designed to guarantee the uniqueness of MN's interface identifier within a MAP domain as long as the MN moves in a MAP domain, so that the MN configures the new address without the DAD procedure resulting in the decreased handoff latency significantly When the MN resides in a subnet, MIPv6 is used adaptively as a mobility management protocol, which is to reduce bandwidth waste from the IP packet header overhead of IP-in-IP tunneling from the regular HMIPv6. We evaluate the performance of the proposed handoff micromobility algorithm in terms of handoff delay and packet loss thru computer simulation. Thru various computer simulation results, we verified the superior performance of the proposed scheme by comparing with the results of other schemes, MIPv6 and HMIPv6.

• 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.