• Journal of Internet Computing and Services
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• v.14 no.3
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• pp.67-79
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• 2013

In wireless networks, efficient mobility management to support of mobile users is very important. Several mobility management schemeshave been proposed with the aim of reducing the signaling traffic of MN(Mobile Node). Among them, PMIPv6 (Proxy Mobile IPv6) is similar with host-based mobility management protocols but MN does not require any process for mobility. By introducing new mobile agent like MAG (Mobile Access Gateway) and LMA (Local Mobility Anchor), it provides IP mobility to MN. In this paper, we propose the analytical model to evaluate the mean signalingdelay and the mean bandwidth according to the type of MN mobility. As a result of mathematical analysis, MF-PMIP (Multicasting-based FastPMIP) outperforms compared to F-PMIP and PMIP in terms of parameters for the performance evaluation.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.11a
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• pp.283-287
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• 2002

VoIP는 음성을 패킷 형태로 통합하여 real time으로 전송하는 기술이다. 최근 VoIP(Voice Internet Protocol)은 음성과 데이터를 통합하는 핵심 기술로 발전하고 있다. VoIP 구현을 위해 현재 가장 많이 사용되는 시그널링 프로토콜들은 H.323, SIP, MGCP, MEGACO 등이 있으며 현재 ITU-T의 H.323 프로토콜을 중심으로 서비스가 진행되고 있지만 많은 기능성과 확장성을 지닌 IETF의 SIP 프로토콜이 보편화될 것으로 예상된다. 본 논문에서는 이동 사용자를 고려하여 VoIP와 Mobile IP를 결합하여 성능 평가를 하였다. Mobile IP는 Mobie host가 인터넷상에서 임의의 위치에 접속하더라도 자신의 고유 주소로 전송되는 패킷을 수신 할 수 있도록 IP 프로토콜을 확장한 기술이다. 이러한 요구를 반영하기 위하여 본 논문에서는 이동 음성 서비스를 위한 H.323/SIP기반 Mobile IP 네트워크를 모델링 한 후 성능평가를 실시하였다.

• Journal of Internet Computing and Services
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• v.9 no.4
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• pp.29-41
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• 2008

Currently, IETF MANEMO(Mobile Adhoc for NEMO) working group is working on standardization supporting internal routing in nested NEMO networks. Nested NEMO has a independent topology feature that Mobile IP and basic NEMO protocol did not caused. This is the reason that causes exceptional mobility pattern. Such mobility patterns also trigger each other reconfiguration requirements. This paper classified and analyzed probable new mobility patterns in nested NEMO network. In concludion, we derived configuration problem from the new mobility patterns and suggested differential reconfiguration requirements through analytical approach.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.11a
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• pp.858-861
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• 2002

As mobile devices have become widely popular, users want to use devices not only wireless but also mobile. Mobile IP is used to support mobility on TCP/IP network. In mobile IP, when a terminal changes location, the terminal requests a registration to Home Agent through Foreign Agent in new location. After the request is accepted by Home Agent, the terminal can use network again. We call this process as handoff. In mobile n, handoff provokes loss of data packets and network delay. In this paper, we describe the implementation of pre-registration which is a solution of the handoff problems. Pre-registration improves the traditional handoff mechanism by requesting registration through current FA before location change. This muchanism can decrease packet loss and network delay.

• Journal of KIISE:Information Networking
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• v.33 no.3
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• pp.218-230
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• 2006

The enterprise service network is composed of internet, intranet and DMZ. The design rationale of Mobile IP is providing of seamless mobility transparency without regarding to the type of network topology and services. However, Mobile IP specification does not include the mobility support in case of using VPN environment and define the access scenarios to get into the VPN intranet without disturbing existing security policy. In this paper, we propose an authentication method using AAA infrastructure and keying material exchange to enable an user in internet to be able to access the intranet through the VPN gateway. Finally, performance analysis for the proposed scheme is provided.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.5
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• pp.85-90
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• 2015

Work environments within the firm with a concept of mobile office is growing divided into two sections. It's Wi-Fi FMC(Fixed Mobile Convergence) field Which are implemented in a telephone service available from existing fixed-line service in the center of the smart phones and the EMS(Enterprise Mobility Service) field to make people will be able to handle PC the center of the information system within an enterprise using a smart phone instead of terminal facility connects to a system in the workplace and external. This paper developed FMC controller to allow execution IMS(IP Multi-Media Subsystem) services to complement the issues of the FMC corporation, telephony service associated. The controller includes FMC automatic enrollment services, voice quality enhancement of the mobile phone, anywhere within the firm on his mobile phone calls can provide mobility and is also implemented FMC LCR function that use status information from mobile soft-phone within the IP-PBX.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.12C
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• pp.1245-1250
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• 2002

For recent years, the environment of use on internet has been changed from the wired internet access to the wireless internet access increasingly, and the use of real time application data has been increased. Therefore the research and evolution of wireless network for providing of user's mobility and QoS at the same time must be essential. IETF already proposed Mobile IPv6 for providing mobility and RSVP for QoS through resource reservation. These future are expected to be used not only wired network but also wireless network. But there are not yet proposed the integration and efficient interworking of two mechanism. For the solution of problem on efficient interworking issue, for instance signaling overhead and reservation delay increasing due to often handoff, this paper first proposed to use of IETF Cellular IP based on Mobile IPv6 for wireless network model with fast mobility and a improved RSVP mechanism using the flow label field in IPv6 header.

• Proceedings of the Korean Information Science Society Conference
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• 2000.04a
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• pp.286-288
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• 2000

본 논문은 intra-region에서의 micro-mobility와 inter-region에서의 macro-mobility를 지원하는 특정 구조의 설계를 주요 내용으로 하고 있다. 이 구조는 홈 에이전트에게 이동에 따르는 정보를 갱신하는 회수를 줄이는 데 좋은 성능을 갖게 된다. 또한, 이 구조는 같은 지역(region)내에서의 이동시에는 자신의 네트워크 주소를 유지하도록 하여, 과다한 의탁주소 할당을 막을 수 있도록 한다. 각 지역은 대표 에이전트(Designated Agent)와 여러 개의 이동 에이전트들로 구성이 된다. 이동 호스트의 이동에 따르는 등록 절차는 계층적인 구조를 기반으로 이루어지며, 이때, 에이전트는 지역 내에서 계층 구조의 형태로 그룹화 된다. DA는 지역에 상관없이 이동 호스트에게 에이전트를 통해서 포워딩 메커니즘을 수행한다. 또한, 이 구조는 기존의 Mobile IP와 호환성을 갖도록 설계되어서, 이동 호스트에게 투명성을 제공한다. 계층적인 구조 설계는 기존 등록과 데이터 전달, 그리고 등록 해제 절차에 일부 수정을 통해서 수행되었다. 그러므로, 본 구조는 자신의 홈 네트워크 내에서 혹은 그 밖의 네트워크에서 이동 호스트에게 유연한 로밍 서비스를 제공하기 위한 좋은 프레임워크를 제공하게 된다.

• Electronics and Telecommunications Trends
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• v.19 no.1 s.85
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• pp.1-8
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• 2004

무선랜 서비스 지역이 점차 확대되면서, 노트북을 이용하여 언제 어디서나 인터넷을 사용하고자 하는 사용자들의 요구도 차츰 증가하고 있다. 이러한 변화를 수용하기 위해 기차, 버스, 배 등 이동수단에서 인터넷 서비스를 제공할 수 있는 기술이 주목 받고 있다. 이러한 기술 중 하나가 IP 네트워크 이동성 기술인 NEMO(Network Mobility)이다. NEMO는 네트워크 내의 모든 노드들이 이동을 인식하지 않고 인터넷 연결 서비스를 받을 수 있도록 이동라우터에서 서비스해 주는 기술이며, 최근 IETF에서 IPv6를 기반으로 표준화가 시작되었다. NEMO 망은 다른 특성의 망을 거치지 않고 인터넷 망에 직접 연결하여 이동성 서비스를 제공한다. 따라서 다양한 이동 수단뿐 아니라 텔레매틱스, PAN, Ad-hoc 네트워크 등에도 이러한 기술이 적용될 수 있을 것으로 생각된다. 본 고에서는 NEMO 서비스를 소개하고 이 서비스를 위해 필요한 기술 개념과 기술 동향 및 향후 연구분야에 대해 논의하고자 한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.10B
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• pp.1182-1191
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• 2011

In this paper, we propose a network-based IP mobility management scheme, called Access Independent Mobile Service with IPv4/IPv6 Dual Stack (AIMS-DS), which can provide high-quality multimedia services to IPv4/IPv6 dual-stack mobile nodes (MNs) without any interruption over various wireless/wired access networks. The proposed scheme provides an MN with a fast and reliable mobility service among heterogeneous wireless access networks through the network-based control, the complete separation method of control and data plane, the cross-layer (layer2 and layer3) interworking method for handover control acceleration, etc, In addition, the proposed AIMS-DS can provide seamless mobility service to an MN under the environments of IPv4/IPv6 coexisting networks through the home address mobility support and transport network support. Through performance evaluation with computer simulations, we have shown the superiority of the proposed AIMS-DS in terms of handover latency, packet 1085 and packet delivery latency.