• Proceedings of the Korea Information Processing Society Conference
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• 2003.05b
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• pp.1305-1308
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• 2003

Mobile Network은 일정한 규모 이상의 이동성을 지원하는 네트워치를 말한다. Mobile IP는 표준 IP에 이동성을 지원하기 위한 기법이다. Mobile IPv4에서는 Mobile Network을 가상적인 하나의 Mobile Node처럼 취급하여 지원이 가능하다. 하지만, Mobile IPv6에서는 몇몇의 문제점으로 인하여 Mobile IPv4에서와 같은 접근이 어렵다. 이 논문에서는 Mobile IPv6환경에서 Mobile Network을 지원할 수 있는 기법을 제안하고 분석하였다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.46 no.1
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• pp.10-23
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• 2009

In this paper we propose a novel mobile terminal software architecture supporting energy efficient handover operation in heterogeneous networks. Since the legacy proposals for L3 handover are mostly dependent on IETF Mobile IP which has some problems in movement detection mechanism and no considerations on nested heterogeneous network environment as a result they make serious overload on networks and terminals by performing unnecessary handover in such network environments. The proposed architecture has terminal-oriented network selection and switching architecture where a mobile terminal periodically monitors network status and selects the optimum network, and reduces energy consumption by making L3 handover of Mobile IP to the finally selected network. The network selection method first picks up some candidate networks by considering a terminal speed and power consumption estimation, and determines the final target handover network among the candidates after evaluating multiple factors including QoS required by a terminal, network status, user preference and terminal battery status. Finally we verify the functionality and performance of the energy efficient vertical handover architecture by means of adopting it into a real mobile terminal.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.6
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• pp.1187-1193
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• 2003

The interest for IPv6, which is next generation IP, increases, while the difficulty for adopting it into IT industries also increases too. We also expect that Internet technologies develop on basis of All-IP networks, which include various heterogeneous networks. Therefore, it is necessary for network to support mobility and multicast capability to create applications with wide-variety. In this paper, we propose a new mobile multicasting protocol called Mobile IPv6 Multicast Protocol(MIMP). The proposed scheme satisfies no packet losses from roaming and optimal routing efficiency.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.24 no.6A
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• pp.832-844
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• 1999

In this paper, we analyzed mobile-IP protocol of IETF, and propose new method to improve performance in handover environments. In proposed method, cache agent manages mobility binding information for mobile host. Thus, effective support of mobility is possible. Also, when handover occurs, mobile host recognizes change of foreign agent, and transmits registration message to new foreign agent. However, during registration time, data packet loss is occurs in old foreign agent. Thus, we prevent data loss by using data packet buffering and forwarding in old foreign agent.According to simulation results for data packet transmission performance in the case of handover occurring, proposed method has better performance than previous method in the view of transmission delay and throughput. Especially, if handover occurs very often, data buffering and forwarding method in foreign agent could guarantee better performance.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.05a
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• pp.543-545
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• 2011

The concern which is abundant in MANET VoIP for comprising the mobility guarantee and mobile network is received without the infrastructure system between the mobile terminal node. However, because the access of system and border is easy, the issue which is big in the security problem becomes more than the wired network system with this convenience by the foreign network attacker differently. In this paper, we would like to the fundamental web network, NAT and concluding the security problem technology in which Firewall can inquire on MANET VoIP and whether it is appropriate or not which can solve this is proposed.

• International journal of advanced smart convergence
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• v.1 no.2
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• pp.1-11
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• 2012

IP-based Wireless Sensor Networks (IP-WSNs) are gaining importance for their broad range of applications in health care, home automation, environmental monitoring, industrial control, vehicle telematics, and agricultural monitoring. In all these applications, a fundamental issue is the mobility in the sensor network, particularly with regards to energy efficiency. Because of the energy inefficiency of network-based mobility management protocols, they can be supported via IP-WSNs. In this paper, we propose a network-based mobility-supported IP-WSN protocol called mSFP, or the mSFP: "Multicasting-supported Inter-Domain Mobility Management Scheme in Sensor-based Fast Proxy Mobile IPv6 Networks". Based on [8,20], we present its network architecture and evaluate its performance by considering the signaling and mobility cost. Our analysis shows that the proposed scheme reduces the signaling cost, total cost, and mobility cost. With respect to the number of IP-WSN nodes, the proposed scheme reduces the signaling cost by 7% and the total cost by 3%. With respect to the number of hops, the proposed scheme reduces the signaling cost by 6.9%, the total cost by 2.5%, and the mobility cost by 1.5%. With respect to the number of IP-WSN nodes, the proposed scheme reduces the mobility cost by 1.6%.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.637-640
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• 2011

Recently, rapid spreading of smart-phone make an expectation for increase of practical application for MANET(Mobile Ad-Hoc Network) which is not used infrastructure like as base-station. One of important application for MANET will be VoIP(Voice over Internet Protocol) known as Internet telephony. On the other hand, information intrusions causing serious problems is not allowed exception of MANET. Especially, there are some dangerous problems of intrusions to MANET, differently to other networks, because of it's usage of military purpose or emergency application of rescue. In this paper, to analyze this intrusion problem on MANET with blackhohe attacks, effect of intrusion to transmission performance is studied. VoIP traffic is assumed as an application service on MANET, computer simulation with NS-2 is used for this analysis.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1998.05a
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• pp.246-251
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• 1998

이동컴퓨터의 기술발전과 더불어 인터넷환경에서 다양한 서비스지원을 위한 이동성지원에 대한 연구가 최근에 활성화되고 있다. 그러나 다자간회의나 다양한 네트워크 환경을 조성하고 있는 인터넷으로 적용을 위해서는 인터레이스를 유연성 있게 지원하는 방법이 제시되어야 한다. IP 기반의 이동컴퓨팅 환경에서는 이동성지원을 위해서 이동호스트의 위치를 정의할 수 있는 Mobile-IP 연구와 멀티캐스트를 지원하는 멀티캐스트연구가 진행되고 있다. 본 논문에서는 IP 기반 이동컴퓨팅 환경에서 멀티캐스트를 지원하기 위한 요구사항을 연구분석하며 인터네트워크 환경으로 적용을 위한 다양한 인터페이스 지원 모델을 제시한다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04d
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• pp.4-6
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• 2003

MANET(Mobile Ad hoc NETwork)은 기간망(infrastructure network)에 대한 의존 없이 필요에 따라 노드(node)들이 자발적으로 임시적인 네트워크를 형성해 데이터를 주고 받는 형태이다. 지금까지 MANET에 관한 대부분의 연구는 노드들이 네트워크에 합류하기 전에 IP주소를 할당받는다는 가정하에 이루어졌다. 기존의 네트워크에서는 IPv4주소의 부족으로 모든 노드에게 영구적으로 IP주소를 할당 할 수 없어 동적으로 IP주소를 할당할 필요가 있을 때 DHCP를 이용해 노드들에게 IP주소를 할당했다. 그러나 MANET의 경우 노드의 이동성으로 인해 중앙집중화 된 DHCP 서버로의 접근을 항상 보장할 수 없다 그러므로 본 논문에서는 MANET의 노드들에게 유일한 IP주소를 동적으로 할당하기 위한 토큰-기반 동적 주소 할당 프로토콜을 제안하였다.

• Journal of Internet Computing and Services
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• v.5 no.1
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• pp.25-32
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• 2004

Mobile computing environment makes it possible for computing activities to be maintained during movement even if a user changes its network point of attachment. Mobile IP is a standard protocol designed to be used in such mobile computing environment. However, Mobile IP has a drawback to incur a lot of handoff delays and waste network resources, since CoA(Care of Address) registration packets need to go through a HA(Home Agent) first whenever a mobile node moves. To solve this long-standing problem, this paper proposes a new scheme that, for infra-domain movement, efficiently performs local handoff without notifying the HA Specifically, based on the notion of load balance, the proposed scheme allows every FA(Foreign Agent) in a domain to become the root FA(also known as domain FA) dynamically, thus distributing the registration task into many other foreign agents. The dynamic root assignment through load balancing ultimately leads to fast network response due to less frequent transmission of registration packets.