• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.6B
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• pp.544-550
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• 2006

Next-generation wireless/mobile networks are envisioned to have an IP-based infrastructure. One of the research challenges for next-generation all IP-based networks is the design of intelligent mobility management technologies that have a seamless mobility and minimal signaling overhead. Recently, HMIPv6 was proposed by the IETF for efficient mobility management. HMIPv6 reduces the amount of signaling and improves the performance of MIPv6 in terms of handover latency. However the MAP can be a single point of performance bottleneck when there are a lot of local movements. HMIPv6 can cause signaling overhead due to the unnecessary location update of idle mobile nodes. Therefore, in this paper, we propose the dynamic paging Mobile IPv6 that reduces the signaling cost of the unnecessary location updates using IP paging and organizes dynamically optimal MAP area according to user's mobility and traffic. We show performance results that are obtained from the average total location update cost and packet delivery cost.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.10a
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• pp.153-155
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• 2010

Internet phone (VoIP) services in Korea have achieved noticeable growth year after year since the service launching, and the growth still coninues. The market of mobile internet phone also expands sharply. Therefore, it is crucial to deploy networks which can support mobile internet phone services with excellent quality. For mobile internet phone services, it will be necessary to build and use networks with good mobility and high transmission rate. Current wireless networks for Internet services include 3G, Wi-Fi, and mobile WiMAX networks. 3G provides good mobility but lower transmission rate, whereas Wi-Fi exhibits excellent transmission rate but less mobility. Mobile WiMAX networks taking the merits of both, high mobility and transmission rate, are being deployed widely in recent years. This article examines the recent standardization efforts of WiMAX Forum for VoIP service in WiMAX networks.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.34 no.7B
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• pp.668-676
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• 2009

Hierarchical Mobile 1Pv6(HM1Pv6) have been proposed by IETF(Internet Engineering Task Force) beginning from Mobile 1Pv6 for mobility support in IP networks, however these researches relying on client based mobility support have not been drawn attention due to excessive consumption of wireless resources and long handover delay. In this paper, we propose the Router-based Binding Update(RBU) scheme to solve problems in existing client-based mobility support schemes. The router registers location information of mobile nodes through Neighbor Discovery protocol without additional codes for the RBU scheme to a terminal operated by existing HMlPv6. By using this the RBU scheme is designed so that it can support partial nupport based mobility and reduce handover latency rather than using HMIPv6. It is analysed and compared with existing HMIPv6 to verify efficiency of the RBU scheme. As a result, the RBU scheme has outperformed existing HMIPv6 by 15% in terms of macro handover delay especially when long delay on wireless links exists.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.11
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• pp.2069-2074
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• 2006

The Next generation network may describe one integrated network by IP (Internet Protocol) convergence and combining various access technologies. The IP version 6 (IPv6) becomes fundamental protocol and the terminal offered various services is having mobility, multihoming, and intelligent as well as smaller. In this convergence network, which integrate mobile network, broad cast network, and Internet as well as PSTN, can provide all of the service. In this context, we will briefly present that the end node should be required ubiquitous computing and networking. That is to say that we must guarantee the end node in any time, my place, my where, and offer continuously services to the node. As like this, Service Mobility is given if a user can obtain subscribed and personalized services consistently even if connected to a foreign network service provider. In other words, Service mobility allows users to maintain access to their services even while moving or changing devices and network service providers. In this paper, we have to refer technical consideration items to make the service mobility framework.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.23 no.9A
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• pp.2230-2239
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• 1998

Recently, mobility support of connectionless mobile ATM data service has been mainly studied in wireless ATM communication network. this paper shows the network model for the mobility support of connectionless data service in ATM network, and proposes the methods to minimize COIP (care of IP address) acquisition processing time for MH(mobile host)migration. Th echaracteristics of proposed methods, COIP acquisition probability and IP data communication sequence of proposed model, are discussed in this paper.

• Proceedings of the IEEK Conference
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• 2007.07a
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• pp.189-190
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• 2007

We propose an efficient internetworking model for fast handover between UMTS and WLAN networks. Mobility anchor (MA) is provided at the boundary between GGSN and PDG, under the 3GPP-proposed internetworking reference model. Such MA can enable authentication and session initialization before L2 handover of the mobile terminal, so that seamless and fast vertical handover could be possible.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.7B
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• pp.760-770
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• 2011

The existing mobility management schemes do not fully support the next generation network, which is composed of IP-based core network and various access networks. Currently, ETRI has been developing the AIMS (Access Independent Mobility Service) system which satisfies the ITU-T requirements of mobility management in the next generation network. The AIMS system is designed to provide a mobile host with a fast and reliable mobility service among heterogeneous access networks. Recently, many user devices have multiple communication interfaces, e.g., 3G and WLAN, and thus they can make two or more network connections at the same time. In this paper, we design a scheme of flow mobility, i.e., the movement of selected data flows from one access technology to another, to be applied in the AIMS system, and verify the proposed scheme through the NS-3 simulation study. From the simulation results, we can know that the proposed flow mobility scheme can utilize the network resource efficiently in the heterogeneous mobile networks.

• Proceedings of the IEEK Conference
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• 2003.07a
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• pp.513-516
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• 2003

데이터 패킷 전송을 지원하는 인터넷망에서는 여러 부가 서비스를 제공할 수 있다. 그중 VoIP 는 킬러 에플리케이션이라고 주목받고 있다. 그러나 기존 회선교환망에서 제공하던 음성전송을 패킷망에서 제공할 경우 여러 문제점이 나타난다. 가장 큰 문제점은 서비스 품질면 즉 많은 유저들이 접속함으로써 일어나는 지연이다. 특히 핸드오프가 빈번한 도메인 환경에서는 접속자수가 증가함에 따라 품질저하는 더 크게 일어난다. Mobile IP 는 도메인내의 빈번한 핸드오프상에서는 많은 단점이 있다. HA(Home Agent)로 빈번하게 시그널을 보내기 때문에 많은 제어 메시지 오버헤드가 있으며, 핸드오프중의 많은 패킷 손실이 있다. Micro-mobility 프로토콜은 기존 mobile IP 의 단점을 보완하기 위해 나온 프로토콜이다. 무선 네트웍상의 도메인내에서의 이동성을 지원하며, 손실과 메시지 오버헤드를 줄여 핸드오프시 높은 성능향상을 주고, 효율적인 위치관리를 제공한다. 본 논문은 NS-2(Network Simulator-2)를 이용하여 여러 마이크로 모빌리티 프로토콜하에서 VoIP 를 운용하였을 때, 어느 프로토콜의 확장성이 우수한지를 비교하고, 빈번한 핸드오프시에 어느 프로토콜이 가장 효율적인지를 제시한다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.4 s.346
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• pp.1-12
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• 2006

In this paper we propose an efficient mobile multimedia communication protocol, mobile terminal software platform and mobile VoIP application for IP-based convergence networks. The Proposed mobile multimedia communication protocol is called as ST-MRSVP (Split tunnel based Mobile Resource reServation Protocol) which integrates split tunnel based Mobile IP and RSVP in order to support hish speed mobility. Since mobile terminal platform supports QoS (Qualify of Service) with keeping seamless mobility, mobile QoS supporting modules are developed and interworked together by means of shared memory mechanism. Testbed is composed of a core-network embedding the proposed protocols and wireless LAN-based access networks. We verify functionality and performance of the proposed techniques by using various mobility test over the testbed. As a result, the proposed architecture can reduce the handover delay time with QoS support under 30% comparing with the standard mechanisms and support voice quality as good as CDMA phone.

• The Journal of the Korea Contents Association
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• v.7 no.4
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• pp.56-65
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• 2007

For supporting seamless service in NGN, various schemes for mobility are studying in ITU-T, 3GPP, IETF, and so on. Currently, mobility support schemes such as MIPv6, IP2, Q.MMF, IMS was introduced. However the performance analysis and comparison of all existing schemes is not examined as yet. That is, the existing mobility methods need to be compared according to same performance parameter. So, in this paper, we investigate and compare the performances of MIPv6, IP2, Q.MMF on latency during location registration. The latency in location registration is consider as cost and time. Then, the performance analysis of Q.MMF Case1 has shown the best performance as it is measured the minimum cost and time. Q.MMF Case1 is the location registration process in case that MT moves within a local network. As LLM in a access network manages the location of MT in this case, Q.MMF Case1 has lower location cost and time than other cases.