• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.11B
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• pp.999-1006
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• 2003

In the paper, we investigate the impact of handoff on the packet delivery in the Mobile IPv6 networks, where the smooth handoff is adopted. That is measured by an 'unstable time period (UTP)', a 'silence time period(STP)', and a 'handoff time period (HTP)' in the mobile node's perspective. Then, we propose a queuing model to get the exact value of the handoff transient time. The numerical results show that the queuing delay for the handoff packets and the involved link (or route) capacities affect the estimated UTP, STP, and HTP. On the other hand, the damage of application caused by handoff will increases when the handoff transient time becomes longer. We show that the priority scheduling method can achieve shorter STP and UP than the FIFO scheduling method that is generally used in best-effort IP network.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.2 s.344
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• pp.16-21
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• 2006

Internet Engineering Task Force(IETF) proposed the Hierarchical Mobile IPv6(HMIPv6) to support mobility efficiently. The HMIPv6 was developed to reduce the signaling overhead and delay concerned with Binding Update in Mobile IPv6. However, the HMIPv6 still need a further enhancement for supporting the real-time application because HMIPv6 only concerns with the latency resulted within a MAP For providing seemless handoff we propose a scheme that can reduce latency when Mobile Node changes a MAP. Also we compare the HMIPv6 with the proposed scheme through a analysis model.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.401-405
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• 2003

Mobile IP is proposed to support IP mobility by IETF. In this article we proposed to minimize delay and packet loss during the handoff by using of fast handoff mechanism. we analyzed performance of basic handoff and proposed handoff by using ns-2 simulator. This proposed mechanism can used the base of research to support efficient handoff under Mobile IPv6 Environment.

• Journal of information and communication convergence engineering
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• v.14 no.2
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• pp.89-96
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• 2016

In mobile communication, there are various types of handoff for the support of all forms of mobility. Proxy mobile IPv6 (PMIPv6) enables local network-based mobility management of a mobile node without any effect of mobility-related signaling. Recently, PMIPv6 has been considered for supporting mobility management in LTE/SAE-based mobile networks. To support seamless mobility in heterogeneous mobile networks, the overall cost of handoffs needs to be minimized and the procedure should be guaranteed to be secure. However, the reduction of the authentication cost has not been fully investigated to provide seamless connectivity when mobile users perform a handoff between the PMIPv6 domains. This paper proposes secure pre-authentication schemes, completing an authentication procedure before performing a handoff, for a fast handoff in PMIPv6. Analytic models have been used for measuring the authentication latency and for the overhead cost analysis. In addition to providing fast authentication, the proposed pre-authentication schemes can prevent threats such as replay attacks and key exposure.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.1C
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• pp.99-106
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• 2005

This Paper suggests the cooperation scenarios between Diameter protocol and Mobile IPv6 protocol. First, this paper designs cooperation scenarios and designs mobility support technology based on the designed scenarios. This paper deanes the interfaces between mobile node and local AAA client using ICMPv6 messages. In addition, this paper designs handoff procedures according to the area, which mobile node moves to.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.07a
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• pp.91-91
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• 2004

• Proceedings of the Korea Society for Simulation Conference
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• 2003.11a
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• pp.139-144
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• 2003

Mobile Node has to maintain communication as they move form place to place, so it doesn't guarantee Quality of Service(QoS). Fast Handoff is important to provide multimedia and real-time applications services in mobile, and it is closely related to handoff delay. Therefore, handoff delay problem is actively studied to quarantee QoS as a main issue in mobile IP research area. Next generation Mobile IPv6 resolve this problem somewhat, triangle problem for first packet and handoff delay still remain. In this paper, we suggest SNMP Information-based routing that adds keyword management method to Information-based routing in active network in order to resolve such a problem, and then suggest QoS controlled handoff based on SNMP Information-Based routing. After modeling of suggested method and existing handoff method, simulations are carried out with NS-2 for performance evaluation. The results of simulations show the some improvement on handoff delay, and therefore on QoS improvement.

• Journal of the Korea Society of Computer and Information
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• v.10 no.4 s.36
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• pp.285-293
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• 2005

Whenever mobile node moves a new domain in multicast environments. Both handoff and join multicast group always occur. These procedures take a much of delay time and lost the packets in flight. Handoff delay is a significant factor fot the QoS of mobile node in mobile environments. In this paper. we propose a new handoff scheme which supports multicast and guarantees a low handoff delay in IPv6. The scheme makes adjacent subnets the member of multicast tree. After that, this eliminates packet loss and reduces the handoff delay time. Simulation shows that the proposed scheme takes a low delay and lower packet loss rate than the remote-subscription scheme.

• Proceedings of the IEEK Conference
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• 2002.07a
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• pp.571-574
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• 2002

In a recent wireless network environments, dynamic host configuration protocol (BHCP) service is used to assign IP addresses to mobile terminals. In IPv6 networks, it is necessary to introduce the concept of handoff to support a seamless service to mobile terminals. In a general soft handoff technique used by code-division multiple acces (CDMA) communication systems, the powers received to base station are simply compared to determine which base station will handle the signal to and from each mobile termins. However, in IPv6 network, to transmit data-oriented services, it is necessary to support an enhanced soft handoff technique with more security and quality of service. In this paper, we propose a scheme to reduce a signaling process of handoff in IPv6 network. Also, we propose a technique to reduce wasted reservation resources and to guarantee quality of service (QoS) using DHCP.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.9A
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• pp.1475-1484
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• 2001

본 논문에서는 최근 이슈가 되고 있는 Mobile-IPv6에서의 새로운 smooth 핸드오프기반의 이동 멀티캐스트 데이터그램 전달 기법을 제안하고 이에 대한 성능을 평가한다. 제안된 알고리즘은 긴 라우팅 경로가 문제였던 Mobile-IPv4에서의 문제를 해결한 Mobile-IPv6를 기초로 하며, Mobile-IPv6 적용시 멀티캐스트 데이터그램 서비스를 운용하는데 요구되는 여러 성능 척도하에서 성능을 평가한다. 새로운 프로토콜의 핵심요소는 멀티캐스트 데이터그램 전달 경로를 줄이기 위해 MDA (Multicast Delivery Agent)를 도입한 것이다. 제안된 프로토콜은 현재까지 제안된 이동망에서의 멀티캐스트 지원 기법 등과 비교하여, 짧은 라우팅 경로 및 이동 호스트에 근접한 노드에서 이동 호스트로의 직접 데이터그램 전송을 통하여 성능 향상을 기대할 수 있다. 특히, 터널링 수 및 멀티캐스트 데이트그램의 평균 라우팅 길이가 줄었으며, 또한 멀티캐스트 트래픽 부하도 감소하였다.