• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.1 s.343
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• pp.103-110
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• 2006

Internet engineering task force (IETF) has proposed hierarchical mobile IPv6 (HMIPv6) in order to reduce a frequent location registration of a mobile node in mobile IPv6 (MIPv6). All traffics toward a mobile node must be transmitted through a MAP in HMIPv6. This brings unnecessary packet latency because of the increased processing cost of packet at the MAP. At this point the processing cost of packet at the MAP is influenced by the packet arrival rate for a mobile node and the number of mobile nodes in MAP domain. In this paper, we propose that MIPv6 and HMIPv6 are adaptively selected to minimize signaling coast of network as complementing weak point of MIPv6 and HMIPv6. After suppose that the packet arrival rate for a mobile node is fixed ,with this in mind, we find the optimal number of mobile nodes compared the total cost of HMIPv6 with the total cost of MIPv6. And if Mobile Nodes that the MAP is able to manage is full in MAP domain, a mobile node entering MAP domain is provided connection by MIPv6 instead of HMIPv6. In the conclusion, the proposed method of this paper shows that the weak points of MIPv6 and HMIPv6 are removed by adaptive selecting each other.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.5 no.11
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• pp.1997-2015
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• 2011

In this paper, we propose the enhanced network-based mobility management protocol, called enhanced proxy mobile ipv6 (E-PMIPv6), which can provide mobile nodes (MNs) with a fast and efficient mobility service in PMIPv6 domain. The proposed scheme can provide a fast and efficient mobility service to MNs and also the strength of network scalability and stability to an access network by proposing the dynamic virtual hierarchical network architecture. In addition, the pre-authentication procedure for an MN, based on the information of neighbor mobile access gateway (MAG) list in the enhanced-policy server (E-PS), is proposed to support seamless handover by reducing MN's handover latency. Through performance evaluations of numerical analyses and simulations, we have confirmed and verified the superiority of the proposed scheme compared to the conventional proxy mobile ipv6 (PMIPv6).

• The Journal of the Korea Contents Association
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• v.9 no.2
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• pp.67-75
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• 2009

The growing need for the mobility supportable networks induces the IP-based mobility management protocols. Though HMIPv6 which manages the micro-mobility of mobile nodes using MAPs suggests an effective method for mobility-support for mobile nodes within the domain that is managed by MAP. There is a problem that traffic may be concentrated on MAPs. In this paper, therefore, we proposed a method that can effectively distribute the traffic which is concentrated on a MAP under phased Mobile IPv6. In our proposed method, two or more MAPs are required and classified as an 'Active MAP' or a 'Passive MAP'. In addition, we defined the state of transition events between Active MAP and Passive MAP and the operations among MAPs for load distribution when an overload condition is occurred at some MAPs by traffic congestion. We compared the performance of our proposed method with its phased Mobile IPv6 to prove the propriety of our proposed method. As a result, we showed that our proposed method can provide an enhanced performance by about 12 percentages in view of packet throughput at the node.

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

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.44 no.10
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• pp.119-126
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• 2007

Recently, the mobility of users and mobile communication technologies have developed rapidly. The users in this state also want to connect their devices and to receive services anywhere, anytime. Hierarchical Mobile IPv6 (HMIPv6) has been proposed by the Internet Engineering Task Force (IETF) to compensate for such problems as handover latency and signaling overhead when employing Mobile IPv6 (MIPv6). HMIPv6 supports micro-mobility within a domain and introduces a new entity, namely Mobility Anchor Point (MAP) as a local home agent. However, HMIPv6 has been found to cause longer handover latency when the inter-domain handover occurs. This is because a Mobile Node (MN) has to generate two addresses and register them to Home Agent (HA) a MAP, respectively. In order to solve such problems, we propose a scheme that an MN generates one address and registers it to HA for supporting fast handover during the inter-domain handover process. In the proposed scheme, the load of MAP and MAP domain is reduced because the number of MNs which are managed by MAP is decreased and the MAP does not perform proxy Neighbor Discovery Protocol (NDP) to intercept packets destined to MNs. We evaluate the performance of proposed scheme in comparison to HMIPv6 through the simulation and numerical analysis.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.8 no.5
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• pp.95-103
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• 2008

The Network Mobility (NEMO) basic support protocol extends the operation of Mobile IPv6 to provide uninterrupted Internet connectivity to the communicating nodes of mobile networks. The protocol is not efficient to offer delays in data delivery and higher overheads in the case of nested mobile networks because it uses fairly sub-optimal routing and multiple encapsulation of data packets. In this paper, our scheme combining Hierarchical Mobile IPv6 (HMIPv6) functionality and Hierarchical Prefix Delegation (HPD) protocol for IPv6, which provide more effective route optimization and reduce packet header overhead and the burden of location registration for handoff. The scheme also uses hierarchical mobile network prefix (HMNP) assignment and tree-based routing mechanism to allocate the location address of mobile network nodes (MNNs) and support micro-mobility and intra-domain data communication. The performance is evaluated using NS-2.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.2B
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• pp.210-216
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• 2004

This paper propose a new structure and procedure that provides fast handover for moving users, who are using real-time applications, in next generation IP networks. This paper also show the excellency of proposed scheme with the delay analysis. The analysis shows that the delay of proposed scheme is lower than existing methods, especially in the situation where the delay between MAP and AR is considerable.

• Journal of the Korea Society of Computer and Information
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• v.9 no.3
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• pp.171-175
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• 2004

This paper proposes a seamless handoff scheme that enables a mobile node to continue a session when moving to an overlapping area. During handoff due to the weakness of signaling, mobile node makes new Care-of Addresses using signals received from access router when MN reaches the edge of its area in addition to its current CoA, and it sends temporary binding update messages to Mobility Anchor Point which manage the area covering MN. MAP receives that binding update messages from MN, and temporarily stores new binding informations from them to its binding cache besides existing binding information for MN. This scheme ensures a seamlessly handoff using multicasting until MN enter a new access router area and sends a confirmed binding update message to MAP.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10c
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• pp.328-330
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• 2004

차세대 네트워크는 IP 기반의 무선 네트워크로 진화하고 있다. 이에따라 최근의 internet Engineering Task force (IETF)에서 효율적인 이동성 관리를 위한 Hierarchical Mobile IPv6 (HMIPV6)을 제안하였다. HMIPV6는 Mobile Anchor Point(MAP)영역안에 지역 등록을 통하여 상당한 시그널링을 줄일 수 있고 핸드 오프 지연시간을 줄이면서 MIPv6의 성능을 향상 가져왔다. 그러나 MAP 영역이 고정되어 있고 단일 MAP에 집중적인 트랙픽이 발생하는 문제점을 가지고 있다. 따라서 이동노드의 이동성 및 트래픽에 의해서 동적으로 MAP 영역을 설정함으로써 트랙픽이 분산되어 질수 있다. 또한 HMIPv6는 Idle 이동노드도 불필요한 위치 등록으로 인하여 시그널링 오버헤드를 방생한다. 따라서 IP 페이징 기법을 사용하여 불필요한 위치 등록에 따른 시그널링을 줄이기 위한 방법을 제시한다. 또한 explicit multicast (Xcast) 방법을 사용하여 효율적인 메시지 전달방법을 제시한다.