• Journal of KIISE:Information Networking
• /
• v.34 no.1
• /
• pp.48-61
• /
• 2007

WiBro (Wireless Broadband) service, developed in Korea, can provide the host mobility while its users hang around within the subnet. Next-generation Internet protocols, IPv6 and Mobile IPv6 (MIPv6), provide a plenty of addresses to the nodes and enable the handover between different subnets. However, MIPv6 is not enough to support a real time service such as VoIP (Voice over IP) due to the long latency, and it is necessary to develop an enhanced handover mechanism which is optimized to the WiBro networks. In this paper, we suggest an improved fast handover mechanism while the mobile node moves around WiBro networks. The proposal is based on Fast Mobile IPv6 (FMIPv6) which is the representative protocol for fast handover, and reduces the handover latency by the close interaction between the link layer (WiBro MAC) and IP layer (FMIPv6). Finally, we analyze the performance of proposed mechanism through the mathematical analysis.

• Journal of KIISE:Information Networking
• /
• v.34 no.1
• /
• pp.41-47
• /
• 2007

The Hierarchical Mobile IPv6 (HMIPv6) has been proposed to accommodate frequent mobility of the Mobile Node and to reduce the signaling load. A Mobility Anchor Point is a router located in a network visited by the Mobile Node. The Mobile Node uses the Mobile Anchor Point as a local Home Agent. The absence of any protections between Mobile Node and Mobile Anchor Point may lead to malicious Mobile Nodes impersonating other legitimate ones or impersonating a Mobile Anchor Point. In this paper, we propose a mechanism of the secure Mobile Anther Point discovery in HMIPv6. The performance analysis and the numerical results presented in this paper show that our proposal has superior performance to other methods.

• Journal of KIISE:Information Networking
• /
• v.32 no.3
• /
• pp.391-403
• /
• 2005

Several nv6 mobility support protocols for mobile Internet services are proposed in IETP : Mobile Ipv6, Hierarchical Mobile Ipv6, and Fast Handovers over Mobile Ipv6. Recently, IEEE 802.11 network has also been widely deployed in public areas for mobile Internet services. In the near future, IPv6 mobility support over IEEE 802.11 network is expected to be a key function to actualize the All If-based mobile various services. For appropriate application of these protocols, the IPv6 mobility support protocols should be analyzed according to their characteristics in terms of signaling, handover latency, lost packets, and required buffer sire as well as the impact of lower layer such as IEEE 802.11 network. In this paper, we analyze the performance of the protocols over IEEE 802.11 network. We define a packet-level traffic model, a network system model, and a mobility model. From these models, we construct a framework for the performance analysis. We also make cost functions to formalize each protocol's performance. Lastly, we analyze the effect of varying parameters used to show diverse numerical results, and compare with each other. From the analysis results, it is concluded that each Protocol has contrary or contrastive advantages with other Protocols, so there is no protocol that holds a dominant position.

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

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

• Journal of Internet Computing and Services
• /
• v.13 no.1
• /
• pp.15-25
• /
• 2012

Mobile IPv6 (MIPv6) is a host-based protocol supporting global mobility while Proxy Mobile IPv6 (PMIPv6) is a network-based protocol supporting localized mobility. This paper makes its focus on how to reduce the longer delay and extra cost arising from the combination of authentication, authorization and accounting (AAA) and PMIPv6 further. Firstly, a novel authentication scheme (Proxy-AAA) is proposed, which supports fast handover mode and forwarding mode between different local mobility anchors (LMAs). Secondly, a cost analysis model is established based on Proxy-AAA. From the theoretical analysis, it could be noted that the cost is affected by average arrival rate and residence time.

• Journal of The Korean Association of Information Education
• /
• v.15 no.1
• /
• pp.129-136
• /
• 2011

The aim of this study is to present the handover procedures and the performance comparisons of layered mobility management schemes for wireless mobile Internet. To investigate efficient mobility management schemes providing seamless information services in a mobile environment, this paper provided the detailed discussions of existing network layered mobility management scheme, including Mobile IPv4, Mobile IPv6, and new transport layer mobility management scheme, stream control transmission protocol (SCTP) based mobility architecture (SMA). Network simulator-2 (ns-2) was used to compare the performance between Mobile IPv6 and SMA in the wireless mobile Internet environment. Simulation results show that for typical network configuration and parameters, SMA has a lower handover latency, lower packet loss rate, and higher throughput than Mobile IPv6.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2007.05a
• /
• pp.1225-1228
• /
• 2007

무선 네트워크와 모바일 기술의 발달로 무선상에서의 통신뿐만 아니라, 모바일 기기의 이동성에 대한 요구가 점점 더 커지고 있다. 모바일 기기의 이동성을 지원하기 위해Fast Mobile IPv6 (FMIPv6), Hierarchical Mobile IPv6 (HMIPv6)와 같은IPv6기반의 네트워크 계층 프로토콜이 제안되어 왔으며, 최근에는 트랜스포트 계층에서 동작하는 mobile Stream Control Transport Protocol (mSCTP) 가 제안 되었다. 네트워크 계층에서의 이동성을 지원하기 위한 방안 중 하나인 FMIPv6 의 핸드오프 과정은 엑세스 라우터간 양방향 터널링을 설정 함으로서 엑세스 라우터의 버퍼링 오버헤드가 발생하고, 터널링 과정을 위한 메시지 교환으로 인해 핸드오프 지연이 발생하게 된다. 본 논문에서는 FMIPv6 의 이러한 단점을 해결하기 위해 트랜스포트 계층의 이동성 지원 방안인 mSCTP 를 이용한 통합 핸드오프 기법을 제안한다. 양단의 세션을 유지한 채 새로운 IP 주소를 등록 할 수 있는 mSCTP 를 사용 함으로서 FMIPv6 의 터널링으로 인해서 발생하는 엑세스 라우터의 오버헤드와 핸드오프 지연 시간을 줄이고 전체적인 핸드오프 성능을 향상 시킨다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2003.10c
• /
• pp.583-585
• /
• 2003

인터넷에 이동성을 부여하기 위한 기술은 호스트 이동성을 넘어 네트워크 전체에 이동성을 부여하는 이동 네트워크 기술로 접어들고 있다. 네트워크 이동성은 Mobile IP 기술을 확장한 MR­HA 간 bidirectional 터널을 통해 지원될 수 있다. 그러나 다수의 이동네트워크가 중첩될 경우 각 네트워크의 MR­HA 터널이 중복되는 dog­leg routing 문제가 발생하게 되고, 이것은 결국 심각한 패킷 전송 지연과 네트워크 트래픽 증가, 불 필요한 시그널 메시지 증가라는 문제를 발생시키게 된다. 따라서 본 논문에서는 Mobile IPv6 기반의 이동 네트워크에서 계층적 알고리즘을 적용하여 경로최적화를 하는 프로토콜의 설계에 대해 논하고자 한다. 계층적 접근방안은 중첩된 이동네트워크 구조와 잘 부합되며, 기존의 Mobile IPv6 기술을 사용하여 쉽게 구현될 수 있다.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.33 no.5A
• /
• pp.509-516
• /
• 2008

The Fast Handover in Hierarchical Mobile IPv6(F-HMIPv6) scheme provides a seamless handover in mobile IP networks effectively. However, there is a problem that the mobile node can lose its connectivity to the previous access router because of a sudden degradation of the link quality during fast handover procedure. Additionally, in many cases, the mobile node does not have enough time to exchange messages during the fast handover procedure, especially in case of movement with high speed during handover. In this paper, we propose a modification to F-HMIPv6 that significantly reduces the time to exchange messages during fast handover procedure and thereby increases the probability which the F-HMIPv6 can perform the fast handover in predictive mode.