• Title/Summary/Keyword: and Mobile Router

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A Study of Performance Enhancement in Hierarchical Mobile IPv6 using Fast-Handoff

  • Kim, Hong-Sik;Kim, Hyun-Yong;Jung, Joseph;Song, Joo-Seok
    • Proceedings of the Korea Information Processing Society Conference
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    • 2004.05a
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    • pp.1417-1420
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    • 2004
  • The combination of Fast-Handoff and Hierarchical Mobile IPv6 (F-HMIPv6) allows the anticipation of the layer3 handoff such that data traffic can be efficiently redirected to the mobile node's new location before it moves there. However, after moving to the new Access Router (NAR), if the mobile node (MN) sends the Local Binding Update (LBU) to the Mobility Anchor Point (MAP) before receiving all of the buffered packet from the NAR, the MN may receive the general packet from the MAP. That is, the MN may simultaneously receive two types of packet which has different sequence number. These cause the confusion in packet order, and the MN sends the dup ack for the packet retransmission to the CN. It results in the degradation of the TCP performance. Therefore, we propose the scheme for minimizing the out-of-sequence packet in F-HMIPv6.

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Mobile Multicast Protocol based on GMR (GMR 기 반 모바일 멀티 캐스트 프로토콜)

  • 최정민;이승원;정기동
    • Proceedings of the Korean Information Science Society Conference
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    • 2001.10c
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    • pp.154-156
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    • 2001
  • 최근 호스트의 이동성을 IP 네트워크상에서 지원하는 연구가 이루어지고 있으며, 현재 Mobile IP가 이러한 연구의 기본으로 사용되고 있다. 그러나 mobile IF는 유니캐스트에 대한 지원을 기본으로 하기 때문에, 본 논문에서는 Mobile IP에 멀티캐스트까지 지원하는 프로토콜을 제시하고자 한다. 여기서 모든 전송은 GMR(group Management router)를 통해 이루어지며. GMR은 모바잎 호스트가 위치하는 멀티캐스트 트리상의 라우터들 중에서 각 멀티캐스트 그룹의 세션을 관리하기 위해 선택된다. GMR을 통만 멀티캐스트 전송은 triangle 문제를 해결하고 가장 최적의 경로로 전송이 이루어진다. 다른 모바일 멀티캐스트 프로토콜인 Bi-directional Tunneling과 MoM보다 네트워크상에 적은 수의 메지가 전송되기 때문에 더 나은 성능을 가짐을 보여준다.

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A Method of efficient connection setting for Mobile IP with high mobility (이동성이 잦은 Mobile IP를 위한 효율적인 연결 설정 기법)

  • Rho Kyung-Taeg;Kim Hye-Young
    • Journal of the Korea Society of Computer and Information
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    • v.9 no.4 s.32
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    • pp.167-172
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    • 2004
  • Although Mobile IP proposed in IETF is effective. it has inefficiency in case mobile hosts communicate with each others while they are roaming frequently in a specific area. It occurs lots of latency because mobile hosts must be registered and establish an secure path under the internet emvironments and transmitting data on the path. Additionally this inefficiency is more aggravated in case mobile hosts has high mobility. Thus this paper propose a method using Anchor foreign agent by Anchor chain method which combine an pointer forwarding and a cache method plus a border router as a way to complement the above problem which exists in an mobility management in a specific area.

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Movement Prediction for Improving Fast Handover in WLAN (WLAN에서 핸드오버 향상을 위한 이동 예측)

  • 김우완;장은진
    • Proceedings of the Korean Information Science Society Conference
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    • 2004.10c
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    • pp.109-111
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    • 2004
  • 본 논문은 IEEE 802.11 네트워크 환경에서 MN(Mobile Node)이 핸드오버를 수행하기 전에 미리 이동 정보를 예측함으로써, 유연하게(Seamless) 서비스를 계속 받을 수 있는 예측 방법을 제안한다. 특히, MN이 속한 AP(Access Point)가 중첩된 상황에서 발생할 수 있는 여러 가지 문제점을 해결한다. MN은 이동성 패턴 레코드를 저장하고, 또한 각 이웃 AR(Access Router)은 AP의 AP-ID(BSSID, Basic Service Set ID)와 채널을 저장한다. MN이 AP의 영역의 경계를 벗어나기 전, 새로운 AP로부터 AP-lD를 획득하면, MN이 저장하는 이동성 패턴 레코드에서, AP-ID와 맞는 정보를 비교하여 확률이 높은 AP를 선택한다. 이러한 정보를 PAR(Previous Access Router)에게 정보를 보내어 신속하게 새로운 링크에서 서비스를 받을 수 있음으로써 손실.지연을 최소화 할 수 있다.

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Route Optimization Scheme using Routing Protocol in Nested Mobile Networks (중첩된 이동 네트워크환경에서 동적 라우팅 프로토콜을 이용한 경로 최적화 기법)

  • Kim, Eui-Kook;Lee, Jong-Hyup
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.12 no.11
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    • pp.1966-1975
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    • 2008
  • NEMO Basic Support Protocol standardized in IETF provides the seamless communication environment to all nodes within the mobile network regardless of the network movement while the network is moving. According to the standard, when the mobile network moves outside of its home network the network can make use of the binding update message or dynamic routing protocol in order to register the mobility information into the Home Agent(HA). But because these two methods don't consider the route optimization, all packets destined to Mobile Network Nodes(MNNs) attached into the Mobile Router(MR) have to go through HAs of MRs so that they bring on the transmission delay and the waste of the bandwidth. This situation is to be worse and causes the packet fragmentation problem if MRs within the mobile network are nested. Even though there have been some researches about the route optimization to recover the problems, they have problems in the packet transmission performance side. In this paper, we propose a new scheme to improve the network performance by using a dynamic routing protocol and minimizing the number of HAs on the end-to-end path. Various performance evaluations show that the proposed mechanism gives better performance in view of the packet transmission compared to the existing schemes.

Implementation and Analysis of the FMIPv6 (Fast Handover for Mobile IPv6) Using Layer 2 Triggers (제2계층 트리거를 이용한 FMIPv6 구현 및 분석)

  • Oh, Seung-Hun;Lee, Sung-Sik;Kim, Young-Han
    • The KIPS Transactions:PartC
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    • v.12C no.4 s.100
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    • pp.551-558
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    • 2005
  • In this paper, we implement the fast handovers for mobile IPv6 (FMIPv6) on Linux system. Due to its dependency on operations in layer-2 (L2), we have added some functions into the network driver to generate triggers as the mobile node moves. We design and implement the FMIPv6 functions divided into two parts as an access router and a mobile node. We compare the packet loss and delay of the FMIPv6 implementation during the handover period with those of the MIPv6 and investigate the performance improvement.

An Authentication and Handoff Mechanism using AAA and HMIPv6 on NEMO Environment (이동 네트워크(NEMO)에서 HMIPv6를 적용한 AAA 인증 방안 연구)

  • Choi, Kyung;Kim, Mi-Hui;Chae, Ki-Joon
    • The KIPS Transactions:PartC
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    • v.16C no.2
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    • pp.165-182
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    • 2009
  • Mobile IPv6 spends considerable bandwidth considering that its signal volume is proportional to the mobile and also it should be strengthened to support the binding signal volume, the traffic, and effective mobility. So, the study in NEMO(Network Mobility), an extended version of Mobile IPv6, has been conducted. NEMO provides its mobility by putting several mobiles and more than one portable router into one unit called as mobile network. Because nodes access Internet via the portable router at this time, it receives transparency without any additional work and that much reduces binding signal while solving binding storm. By supporting mobility, NEMO is able to have various mobile structures which realize several networks hierarchically and it is necessary to improve its safety and security by authenticating among the upper networks or the lower ones while moving. Also, it is extremely required to begin a study in the device to improve efficiency accompanied with mobility, which is executed by the fast hand-off as well as the safe authentication. For those reasons, this paper not only classifies various NEMO mobile scenarios into 7 ways, but also provides AAA authentication of each scenario, the authentication through the safety authentication and fast handoff authentication using F+HMIPv6 and the way to reduce both signaling volume and packet delays efficiently during the handoff.

A Seamless Handover Scheme for High-Speed Trains using Dual Mobile Routers (고속철도 환경에서 이중 이동 라우터를 이용한 끊김없는 핸드오버 방안)

  • Park Hee-Dong;Kwon Yong-Ha;Lee Kang-Won;Lee Sung-Hyub;Cho You-Ze;Yoon Yong-Ki
    • Journal of KIISE:Information Networking
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    • v.33 no.3
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    • pp.269-276
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    • 2006
  • This paper proposes a seamless handover scheme for high-speed trains using dual mobile routers to minimize service disruption time and packet loss during handovers. In the proposed scheme, each of the dual mobile routers is located at each end of the moving network for space diversity. One of the two mobile routers can continuously receive packets from its home agent, while the other is undergoing a handover, but they act as one logical mobile router. Analytical and simulation results showed that the proposed scheme could provide no service disruption or packet losses during handovers.

Design and Performance Evaluation of Resequencing Algorithm for TCP Performance Enhancement in FHMIPV6 Handover (FHMIPv6 핸드오버에서 TCP 성능 향상을 위한 재정렬 알고리즘 설계 및 성능 분석)

  • Hwang An-Kyu;Lee Jae-Yong;Kim Byung-Chul;Lee Jae-Hoon
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.43 no.3 s.345
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    • pp.118-125
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    • 2006
  • Mobile nodes in FHMIPv6 has both advantages of HMIPv6 protocol which reduces signaling delay time and resource consumption during a handover and fast handover algorithm which reduces packet loss. Fast handover algorithm can reduce packet loss by 'tunneling' method ; that transmits a packet from old access router to new access router in case of handover. However, the fast handover algorithm can cause a reordering problem in a receiver between packets tunneled from the previous access router and packets transmitted directly to the new access router, which could degrade the TCP performance due to congestion control. In this paper, we propose two algorithms to solve the reordering problem in fast handover. The first one uses a holding timer for tunneling, the other adds a new algorithm to routers that adopt snoop protocol. We compare the performance of the proposed reseuquencing algorithms with that of the existing FHMIPv6 protocol by simulation. The simulation results show that the proposed algorithms solve the reordering problems and enhance TCP performance by preventing TCP sender entering congestion control.

Intrusion Detection Algorithm in Mobile Ad-hoc Network using CP-SVM (Mobile Ad - hoc Network에서 CP - SVM을 이용한 침입탐지)

  • Yang, Hwan Seok
    • Journal of Korea Society of Digital Industry and Information Management
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    • v.8 no.2
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    • pp.41-47
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    • 2012
  • MANET has vulnerable structure on security owing to structural characteristics as follows. MANET consisted of moving nodes is that every nodes have to perform function of router. Every node has to provide reliable routing service in cooperation each other. These properties are caused by expose to various attacks. But, it is difficult that position of environment intrusion detection system is established, information is collected, and particularly attack is detected because of moving of nodes in MANET environment. It is not easy that important profile is constructed also. In this paper, conformal predictor - support vector machine(CP-SVM) based intrusion detection technique was proposed in order to do more accurate and efficient intrusion detection. In this study, IDS-agents calculate p value from collected packet and transmit to cluster head, and then other all cluster head have same value and detect abnormal behavior using the value. Cluster form of hierarchical structure was used to reduce consumption of nodes also. Effectiveness of proposed method was confirmed through experiment.