• Title/Summary/Keyword: 모바일 아이피

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Fast Handoff Technique using Improved Cashing Agent and CoA Pool in Mobile IP (모바일 아이피에서 개선된 캐싱 에이전트와 CoA 풀을 사용한 빠른 핸드오프 기법)

  • Lee, Jang-Su;Kim, Sung-Chun
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.45 no.2
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    • pp.75-82
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    • 2008
  • Mobile IP was proposed to overcome identity problem of original IP address system caused by mobility of wireless mobile host. To complete its network handoff procedure, it must receive a mobile advertisement broadcasted by mobile agent. Generally, in a mobile IP system, mean time delay, 500ms, in a network handoff procedure is a critical problem of wireless service such as Voip, multimedia streaming. A caching agent caches a latest mobile advertisement, and replays it by receiving solicitation message from a mobile node finishing link layer detection. But, during the procedure of mobile registration, many packets from service provider to the mobile host would be lost and handoff time delay would be increased. In this thesis, we propose an unproved caching agent technique which can forward data packets while handoff procedure, and CoA pool for fast mobile IP registration.

Technique of Handoff Delay Reduction in Mobile IP (Mobile IP 에서의 핸드 오프 지연 시간 감소 기법)

  • You, Seung-Yeon;Lee, Jang-Su;Lee, Sung-Ju;Sin, Hong-Joong;Yoo, Seung-Hwan;Lee, Sang-Hyuck;Kim, Seung-Wook;Kim, Sung-Chun
    • Proceedings of the Korea Information Processing Society Conference
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    • 2007.11a
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    • pp.1014-1017
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    • 2007
  • 무선랜에서는 작은 셀 크기로 인해 노드들의 이동에 따른 빈번한 핸드오프가 이루어진다. 그래서 무선랜에서는 지속적인 통신 서비스를 제공하기 위한 방법으로 모바일 아이피와 같은 방법을 개발하고 있다. 모바일 아이피는 모바일 노드가 한 장소에서 다른 장소로 이동할 때 IP 주소의 변경 없이도 이동할 수 있도록 해준다. 그러나 모바일 아이피는 긴 시간의 등록과정과 연결 재설정 때문에 시간지연이나 패킷 손실과 같은 오버헤드를 발생시킨다. 따라서 무선랜의 QOS(Quality Of Service)를 향상시키기 위해서 Mobile IP 의 핸드오프 시간을 줄여야만 한다. 본 논문은 이러한 문제를 해결하기 위해 핸드오프 지연 시간을 감소시키는 기법을 제안한다. 제안기법의 기본 아이디어는 모바일 노드의 이동 네트워크를 예상하여, 미리 패킷 포워딩을 수행하는데 있다. 우리는 각 모바일 노드들에게 connection proxy table 정보를 추가하였다. 그리고 이 테이블 정보를 이용함으로써 모바일 노드들은 홈에이전트와 포린에이전트에 COA(Care of address)를 미리 등록하는 것이 가능해졌다. 그 결과로 이동 노드들은 홈 네트워크를 완전히 벗어나지 않고도 핸드오프가 이루어져 지속적인 서비스가 가능하였다. 본 논문에서 제안하는 기법이 기존 Mobile IP 와 비교해 볼 때 핸드오프가 이루어지는 동안 비 연결 시간을 줄일 수 있다는 것을 실험결과를 통해서 확인할 수 있었다.

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NEMO-enabled Hybrid Distributed Mobility Management (네트워크 이동성을 지원하는 하이브리드 분산 이동성 관리)

  • Wie, Sunghong
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.22 no.7
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    • pp.1030-1040
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    • 2018
  • In Distributed Mobility Management (DMM) protocol, the mobility functions are distributed to network edge closer to mobile users. DMM protocol has some advantages of low-cost traffic delivery, optimized routing path, high scalability. However, it needs many mobile anchors to exchange signaling messages and it results in a high signaling cost. Thus, previous works suggested the hybrid DMM protocol to reduce the high signaling cost for long-live sessions and this paper extends a hybrid scheme to the NEMO environment. The mobile routers are installed at vehicles and can move together with several mobile devices. So we can define the high-mobility property for mobile routers and suggest the hybrid scheme using this property. According to the high-mobility property of mobile routers, we can distribute the mobile anchors or allocate a centralized mobile anchor. In this paper, we mathematically analyze the performance of the proposed NEMO-enabled hybrid DMM protocol and show superior performance.

mVoIP Vulnerability Analysis And its Countermeasures on Smart Phone (스마트폰에서 mVoIP 취약성 분석 및 대응 방안)

  • Cho, Sik-Wan;Jang, Won-Jun;Lee, Hyung-Woo
    • Journal of the Korea Convergence Society
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    • v.3 no.3
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    • pp.7-12
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    • 2012
  • mVoIP (mobile Voice over Internet Protocol) service is a technology to transmit voice data through an IP network using mobile device. mVoIP provides various supplementary services with low communication cost. It can maximize the availability and efficiency by using IP-based network resources. In addition, the users can use voice call service at any time and in any place, as long as they can access the Internet on mobile device easily. However, SIP on mobile device is exposed to IP-based attacks and threats. Observed cyber threats to SIP services include wiretapping, denial of service, and service misuse, VoIP spam which are also applicable to existing IP-based networks. These attacks are also applicable to SIP and continuously cause problems. In this study, we analysis the threat and vulnerability on mVoIP service and propose several possible attack scenarios on existing mobile VoIP devices. Based on a proposed analysis and vulnerability test mechanism, we can construct more enhanced SIP security mechanism and stable mobile VoIP service framework after eliminating its vulnerability on mobile telephony system.

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.

A Route Optimization Scheme for Heterogeneous Nested Mobile Networks (혼재된 중첩 이동 네트워크에서의 라우팅 최적화 기법)

  • Cho, Ho-Sik;Kwon, Tae-Kyoung;Choi, Yang-Hee
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.2B
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    • pp.82-89
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    • 2008
  • Mobile IP is the basic solution to provide host mobility, whereas network mobility refers to the concept of collective mobility of a set of nodes. In a network mobility scenario, mobile networks can be nested in a hierarchical form. That situation is referred to a nested mobile network Nested mobile networks exhibit the pinball routing problem, which becomes worse in proportion to the number of nested levels in the hierarchy. In this paper, we propose a routing optimization scheme having backward compatibility to the basic network mobility protocol and concerning heterogeneity of nested mobile network, also we perform comparison and analysis of proposed schemes.

Mobility Management Scheme for the Wireless Mesh Network using Mobility Anchor Point (MAP를 적용한 무선 매쉬 네트워크에서의 이동성 관리방법)

  • Jang, Sung-Hwan;Cho, Kyu-Seob
    • Journal of Internet Computing and Services
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    • v.12 no.3
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    • pp.101-110
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    • 2011
  • WMN is highlighted as a next generation network technology due to relatively reasonable cost to be built, compared with the pre-existing wireless network. It also enables same kind of network or even other kind of network to be integrated. Some WMN researches support mobility using router protocol such as AODV and DSR because WMN has the similar features with Ad-hoc network in terms of operation. However, WMN has got different operations with additional functions of multi-interface and internet connect, it can't be a good method to manage efficient mobility any more. This study suggests method to apply MAP function of HMIPv6 to WMN as a way to manage WMN mobility. Through simulation, operation was verified and function was appreciated. Through the results of evaluation, the suggest mobility management had shorter handover delay and packet loss reduced, which improved whole network throughput rate, compared with mobility management using AODV.

Mobile IP local pre-registration scheme for accommodating real-time data traffics in cdma2000 Networks (cdma2000 네트워크에서 실시간 데이터 트래픽을 수용하기 위한 Mobile IP 지역내 사전등록 기법)

  • 박민철;임재성
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.28 no.7A
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    • pp.493-502
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    • 2003
  • In this paper, to solve some problems of the Mobile IP and local registration strategy we propose a method that can effectively support real-time traffics sensitive to delay time and packet loss. The proposed method reduces the registration time after a Mobile Node's movement between networks by carrying out the pre-registration for the domain which it will move into the network information of the link layer of cdma2000 system, at the boundary cell's handoff zone. Through the cost analysis and simulation it is shown that the proposed scheme yield a better performance compared with the Mobile IP and local registration strategies in terms of packet loss for parameters; variation of the velocity of a Mobile Node, and a distance between the Mobile Node and home networks, etc.

Performance Evaluation of Hybrid Distributed Mobility Management (하이브리드 분산 이동성 관리 방식의 성능 평가)

  • Wie, Sunghong;Jang, Jaeshin
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.21 no.10
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    • pp.1862-1872
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    • 2017
  • To overcome the limitations of the current Central Mobility Management (CMM) protocols, IETF has been discussing about the Distributed Mobility Management (DMM) protocols that the centralized mobility functions of Home Agents (HA) are distributed to network edges closer to mobile users. The DMM protocol has some advantages of low-cost traffic delivery and high scalability. However, it faces several problems such as a high signaling cost and a complex address management. Especially, users moving at a high speed and with long-live sessions can make these problems worse. To reduce the high signaling cost for long-live sessions, we propose a novel hybrid DMM protocol allocating different mobility anchors according to the session durations. In this paper, we analyze the performance of the proposed hybrid DMM protocol and show superior performance with respect to the signaling cost.

Logical Interface based HNP Change Scheme for Flow Mobility in PMIPv6 Domains (PMIPv6 도메인에서 플로우 이동성 지원을 위한 논리인터페이스 기반 HNP 변환 기법)

  • Hong, Yong-Geun;Han, Ky-Jun;Youn, Joo-Sang
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.4
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    • pp.677-685
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    • 2012
  • Recently, wireless multi-networking technology has been studied for supporting multi-interface in mobile node. As the related work, in the IETF NetExt WG, the extension of Proxy Mobile IPv6 protocol for supporting flow mobility is actively on going in discussion. PMIPv6 protocol supports simultaneous access through the multi-interface in a mobile node and inter-technology handover between multiple interfaces. However, this protocol can not support flow mobility. Thus, in this paper, when a mobile node connects to PMIPv6 domain through multi-interface, as a way to support flow mobility, the design of logical interface and Home Network Prefix change scheme based on logical interface are proposed, We show that the proposed scheme can perform flow mobility service without end-to-end disconnection in PMIPv6 domain.