• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.2
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• pp.431-435
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• 2005

Mobile Ad-Hoc network is the network(MANET) of mobile nodes which has no fixed infrastructure, and mobile node in MANET can move and communicate freely each other. Recently, many researches for mobility management of mobile nodes are actively carried out by using the location information of mobile nodes. The location management is an important issue in MANET because location information of mobile node is frequently changed in MANET. In this paper, an adaptive mobility management scheme using fuzzy-logic based GQS by considering the mobile locality is proposed in order to manage location information of mobile nodes in MANET efficiently. The proposed scheme selects mobility databases adaptively from GQS by considering the locality of mobile node. The performance of the mobility management scheme proposed in this paper is evaluated by an analytic model and compared with that of existing UQS based mobility management scheme.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06d
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• pp.465-467
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• 2012

PMIPv6(Proxy Mobile IPv6)는 이동 노드(Mobile Node: MN)을 대신하여 엑세스 네트워크에서 노드의 이동성을 지원하기 위한 프로토콜로써 네트워크-기반 이동성 지원 기법이다. PMIPv6 프로토콜에서는 또한 여러 개의 인터페이스를 가지고 있는 MN이 각각의 인터페이스를 이용하여 도메인에 접속할 수 있게 함으로써 데이터 서비스를 다른 인터페이스로 이동하여 받을 수 있도록 하는 플로우 이동성에 대한 논의가 활발히 이루어지고 있다. 이 논문에서는 특별히 플로우 이동성에서 고려해야 할 문제 중의 하나인 트리거에 따른 플로우 이동성 관리에 대해 표준 제안들과 비표준 제안들의 절차를 비교한다.

• 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.

• Journal of the Korea Computer Industry Society
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• v.3 no.8
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• pp.1049-1062
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• 2002

As the distributed resources in the networks have become increasingly popular, the accesses to these resources having been activated. Especially, the accesses to the distributed resources using the mobile agent technologies provide the mechanisms supporting mobility with mobile users as well as the dynamic accesses to the resources in the fixed networks. Proxy-based mobile agent model is defined as mobile agent network model which allocates the hierarchical domains to the distributed resources changed dynamically, assigns one proxy server for each domain, and promotes the management and the cooperation of the mobile agents. In this paper, we introduce the architecture and the execution scenario for proxy-based mobile agent model which is suitable for the hierarchical management domains. In simulation, we evaluate the proxy server's route optimization functionality and the performance reducing execution time of the mobile agents.

• The KIPS Transactions:PartC
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• v.13C no.3 s.106
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• pp.375-382
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• 2006

As various kinds of embedded systems (or devices) become widely available, research on home network middleware which can access and control embedded home appliances are actively being progressed. However, there is a significant problem in applying the home network technology to embedded systems because of their limited storage space and low computing power. In this paper, we present a lightweight middleware for home network on embedded systems. Also, we propose a mechanism for mobility management which adopts the anycast technology.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.05a
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• pp.921-924
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• 2004

에이전트 협업은 다수의 에이전트가 하나의 업무에 참가하는 것을 말한다. 물리적인 위치 제약에서 자유로운 이동 에이전트는 네트워크상의 여러 호스트 들을 이동하면서 작업을 수행할 수 있다. 이러한 이동 에이전트로 협업을 할 때 멤버 에이전트의 위치와 할당된 업무를 제어하는 중앙 관리 에이전트가 필요하다. 중앙 관리 에이전트는 요청 받은 업무를 분할하여 이 업무를 수행할 수 있는 에이전트들과 협업을 한다. 중앙 관리 에이전트 역시 이동에이전트 라는 점을 이용하여 한 장소에서만 협업을 하는 것이 아니라 협업 수행 중 또 다른 협업이 필요하게 되면 다른 네트워크로 이동하여 협업 그룹을 생성할 수 있다. 본 논문에서는 이동에이전트를 이용해서 위치에 제약을 받지 않는 협업과 로컬/리모트 상의 중앙 관리 에이전트간 통신을 통해 협업 그룹을 동적으로 확장할 수 있는 그룹관리 기법을 제안한다.

• Journal of KIISE:Information Networking
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• v.35 no.1
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• pp.11-20
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• 2008

An inevitable trend in the next generation wireless network environments is coexistence of different wireless access networks in a complementary, manner. In addition, mobile devices equipped with multiple air interfaces simultaneously executing diverse applications have been emerging, In such network environment, It is required that a solution for mobile users to seamlessly roam between different access networks as well as to satisfy QoS requirements of each application by efficiently utilizing coexisting various wireless access networks. In this paper, therefore, we propose a mobility management platform based on per-application end-to-end mobility management and cross-layer handover controls. Four core functional modules composing the proposed platform for end user devices are defined: Monitoring Agents, Profile Database, Decision Engine, and IP Agent. We show through simulations that the presented platform provides an improved QoS as it selectively utilizes the best available networks.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.12 no.4
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• pp.211-221
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• 2012

The development of wireless sensor networks (WSNs) is progressed slowly due to limited resources, but it is in progress to the development of the latest IP-based IP-WSN by the development of hardware and power management technology. IPv6 over Low power WPAN (6LoWPAN) is capable of IPv6-built low-power devices. In these IP-based WSNs, existing IP-based techniques which was impossible in WSNs becomes possible. 6LoWPAN is based on the IEEE 802.15.4 sensor networks and is a IPv6-supported technology. Host-based mobility management scheme in IP-WSNs are not suitable due to the additional signaling, network-based mobility management scheme is more suitable. In this paper, we propose an enhanced PMIPv6-based route optimization scheme which consider multi-6LoWPAN network environments. All SLMA (Sensor Local Mobility Anchor) of the 6LoWPAN domain are connected with the SPIG (Sensor Proxy Internetworking Gateway) and performs distributed mobility control for the 6LoWPAN-based inter-domain operations. All information of SLMA in 6LoWPAN domain is maintained by SMAG (Sensor Mobile Access Gateway), and then is performed the route optimization quickly. The status information of the route optimization from SPIG is stored to SLMA and it is supported without additional signaling.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.1
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• pp.97-105
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• 2015

Recently, due to an explosive growth of the internet traffic, the limitations of a current framework for a mobility management have been focused. The current centralized mobility management is prone to several problems and limitations: suboptimal routing, low scalability, signaling overhead, and a single point of failure. To overcome these problems and limitations, IETF is working about the distributed mobility management scheme that the centralized mobility functions of HA(Home Agents) are distributed to networks edges such as access routers. These distributions of mobility functions overcome the limitations of the centralized mobility managements and go with the trend of flat networks e.g. more simple network architecture. This paper analyzes the distributed mobility management based on Proxy Mobile IPv6 and demonstrates the performance superiority.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10a
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• pp.592-594
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• 2003

애드 혹 네트워크는 고정된 기반 구조 없이 이동 호스트들로만 구성된 네트워크 망이다. 애드 혹 네트워크는 노드의 잦은 이동으로 인한 토폴로지의 잦은 변화로 관리면에서 많은 어려움을 가지고 있다. 따라서 애드 혹 네트워크에서의 라우팅 경로에 대한 신뢰도를 높이는 방법의 중요도가 커지고 있다. 본 논문에서는 기존의 Zone Routing Protocol을 응용하여 만든 Clustered Zone Routing Protocol을 기반으로 하여 라우팅 경로의 신뢰도를 향상시키고자 한다. 기존의 라우팅 프로토콜에 비해 경로상의 노드끼리의 인증을 통한 보안성을 증가시키고, 질의 제어 메커니즘을 통해 전체적인 질의 제어 메시지의 수를 감소시키고자 한다.