• KIPS Transactions on Computer and Communication Systems
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• v.2 no.6
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• pp.265-278
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• 2013

With the recent advancements in various wireless communication technologies, the importance of mobile multicasting is coming to the fore, in an effort to use network resources more efficiently. In the past, when various mobile IP-based multicast techniques were proposed, the focus was put on the costs needed for network delivery for providing multicast services, as well as on minimizing the multicast handover delay. For techniques using MIPv6 (Mobile IPv6), a host-based mobility management protocol, however, it is fundamentally difficult to resolve the problems of handover delay and tunnel convergence. To resolve these problems, a network-based mobility management protocol called PMIPv6 (Proxy Mobile IPv6) was standardized. Although performance is improved in PMIPv6 over MIPv6, it still suffers from the problems of handover delay and tunnel convergence. In this paper, to overcome these limitations, a technique called LFH (Low-cost and Fast Handoff) is proposed for fast and low-cost mobility management with multicasting support in PMIPv6 networks. To reduce the interactions between the complex multicast routing protocol and the multicast messages, a simplified proxy method called MLD (Multicast Listener Discovery) is implemented and modified. Furthermore, a TCR (Tunnel Combination and Reconstruction) algorithm was used in the multicast handover procedure within the LMA (Local Mobility Anchor) domain, as well as in the multicast handover procedure between domains, in order to overcome the problem of tunnel convergence. As a result, it was found that LFH has reduced multicast delay compared to other types of multicast techniques, and that it requires lower costs as well.

• Journal of KIISE:Information Networking
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• v.29 no.2
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• pp.197-203
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• 2002

This paper proposes a new agent based mechanism called a Multicast Handoff Agent (MHA) to reduce handoff latency for IP multicast. The MHA acts as a proxy for an Internet Group Management Protocol (IGMP) of Mobile Nodes (MNs) at each Base Station (BS) and keeps information for members of multicast groups in a cell. When an MN moves to a next cell, the MHA immediately sends unsolicited reports without waiting for the IGMP query. The mechanism was evaluated through simulation and analysis and compared with the IGMPv2 for micro-mobility and the IGMP traffic. Simulation results show that handoff latency for micro-mobility can be largely reduced and the IGMP control traffic on the wireless links during the duration of membership can be eliminated. Thus, this mechanism is superior to the existing mechanism in both micro-mobility and battery duration, as the need not to reply to a query conserves battery power.

• The Transactions of the Korea Information Processing Society
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• v.6 no.10
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• pp.2649-2658
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• 1999

This paper proposes a new solution to support Internet Multicast for mobile hosts. The proposed algorithm is based on the remote subscription approach of IETF Mobile IP that mobile node re-subscribes to its desired multicast groups while at a foreign network. In addition, we adopt the bi-directional tunneling to minimize the disruption of multicast service due to movement of a host from network to another. This paper also analyzes the handoff latencies and data packet loss amount of our algorithm and compares to other approaches. Our analysis shows that the proposed algorithm has good robustness, scalability and routing efficiency.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.11a
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• pp.452-452
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• 2004

• Proceedings of the Korean Information Science Society Conference
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• 2002.10e
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• pp.433-435
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• 2002

All IP Mobile Network 하에서의 효율적인 멀티캐스트 전송의 필요성이 부각되고있다. Mobile IP프로토콜은 기본적으로 유니캐스트전송을 지원하며, 멀티캐스트 전송에 대해서는 효과적으로 정의하지 못하고 있다. 본 연구는 Mobile IP 망에 명시적 라우팅 프로토콜을 적용할 경우 기존 멀티캐스트 라우팅 도매인과의 연동을 하기 위한 미디어 게이트웨이(MGEM)를 설계하고 개발한다. 기존 멀티캐스트 트래픽을 1:N tunnel 의 특성을 가지는 명시적 멀티캐스트 전송방식을 사용하여 멀티캐스트 패킷을 이동단말들에 전송하기 위해서는 Mobile IP 홈에이젼트가 MGEM으로 확장되어야 하며, 이는 IGMP, SDP, 확장 HA 및 멀티캐스트 라우터 기능을 갖도록 요구된다.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.139-141
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• 2002

차세대 인터넷은 유.무선이 혼합된 초고속의 네트워크 구조에서 사용자가 시간과 장소에 관계없이 실시간 멀티미디어 서비스를 제공받을 수 있는 환경으로 변화될 것이다. 이 변화에 잘 대응하기 위해서는 이동하는 사용자에게 효율적으로 멀티캐스팅을 지원할 필요가 있다. Mobile IP 기반의 이동 네트워크 환경에서 멀티캐스팅을 지원하기 위만 연구는 크게 HA(Home Agent)기반 방식과 FA(Foreign Agent)기반 방식으로 연구되어 왔다. HA기반 방식은 데이터 전송 경로의 비최적화, 비효율적인 데이터 중복 전송의 문제를 가지고, FA기반 방식은 빈번한 멀티캐스트 전송 트리의 재구성으로 인한 오버헤드의 문제를 내포하고 있다. 따라서, 본 논문에서는 MH(Mobile Host)의 잦은 핸드오프(handoff) 문제를 해결하고, 멀티캐스트 전송 트리의 재구성으로 인한 오버헤드를 줄이는 방법을 제안한다. 이 방법은 계층적 트리 구조의 도메인을 구성하고 MFA(Multicast Forwarding Agent)와 홉 카운터로 정의된 MFA의 서비스 범위를 사용한다. 또한, MFA를 Root FA들 중에서 선택함으로써 멀티캐스트 전송 트리 재구성의 회수를 줄여 Mobile IP를 이용하는 MH에게 효과적인 멀티캐스팅을 제공한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.3B
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• pp.208-213
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• 2011

Since the wireless technologies based on the IP have been developed recently, a variety of mobile services has been proposed. For broadcasting services to utilize network resources efficiently, there is a need to support handover of multicast traffic in mobile networks. In this paper, we add a network function block to solve the tunnel convergence problem, and propose a new fast handover scheme to reduce handover latency for PMIPv6 networks with multicast function. With the simulation result, we show that our fast handover scheme has better performance than the draft in the IETF in the viewpoint of handover latency and multicast service disruption.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.1A
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• pp.46-54
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• 2005

This paper presents an effcient mobile multicast method using the user pattern. We exploit the repetitive movement pattern of mobile node to reduce the total number of experience of graft and join procedure. We defined the locality scope by a movement pattern. While the network is included in the locality scope, the network should maintain a multicast tree even when the mobile node moves to the other network. In this way, the mobile host can receive a multicast service without a delay when it moves to the network in the locality scope later. We compare our scheme with existing schemes under the total signaling cost and the service delay time by using a discrete analytical model for cost analysis. Analytical results demonstrated that the total signaling cost and service delay time was significantly reduced through our proposed scheme.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.38 no.8
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• pp.11-18
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• 2001

In this paper, we propose a multicast routing scheme for an efficient and reliable support of multicast service to mobile hosts in IPv6 based networks. The purpose of this paper is to develop an algorithm to reduce both the number or multicast tree reconstruction and the multicast service disrupt time. The proposed multicast routing scheme is a hybrid method using the advantages of the bi-directional tunneling and the remote subscription proposed by the IETF Mobile IP working group. The proposed scheme satisfies the maximum tolerable transfer delay time and supports the maximum tunneling service. The simulation results show that the proposed scheme has better performance in the number of multicast tree reconstruction and the time of multicast service disrupt than the previous schemes does.

• Proceedings of the Korea Multimedia Society Conference
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• 2000.11a
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• pp.295-298
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• 2000

본 논문에서는 Mobile IP상에서 멀티캐스트를 지원하기 위하여 IETF 표준에 제시된 원격가입과 양방향과 터널링 기법의 단점을 보완하는 통합 모델을 제시한다. 제안된 모델의 특징은 이동호스트(MH)가 다른 네트워크로 이동할 경우 외부 에이전트(FA)의 멀티캐스트 그룹가입 여부에 따라서 홈 에이전트(HA)를 통한 양방향 터널링 또는 FA의 멀티캐스트 그룹에 재가입하는 방법을 이용한다. 이에 따라, 패킷의 손실을 최소화하면서 패킷에 대한 최적의 경로를 제공할 수 있도록 상황에 따라 두 방법이 상호보완적으로 동작하게 된다.