• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권9호
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• pp.2118-2135
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• 2012

With the rapid development of heterogeneous emerging wireless technologies and numerous types of mobile devices, the need to support robust mobile video streaming based on the seamless handover in Future Internet is growing. To support the seamless handover, several IP-based mobility management protocols such as Mobile IPv6 (MIPv6), fast handover for the MIPv6 (FMIPv6), Hierarchical MIPv6 (HMIPv6) and Proxy Mobile IPv6 (PMIPv6) were developed. However, MIPv6 depreciates the Quality-of-Service (QoS) and FMIPv6 is not robust for the video services in heterogeneous emerging wireless networks when the Mobile Node (MN) may move to another visited network in contrast with its anticipation. In Future Internet, the possibility of mobile video service failure is more increased because mobile users consisting of multiple wireless network interfaces (WNICs) can frequently change the access networks according to their mobility in heterogeneous wireless access networks such as 3Generation (3G), Wireless Fidelity (Wi-Fi), Worldwide Interoperability for Microwave Access (WiMax) and Bluetooth co-existed. And in this environment, seamless mobility is coupled according to user preferences, enabling mobile users to be "Always Best Connected" (ABC) so that Quality of Experience is optimised and maintained. Even though HMIPv6 and PMIPv6 are proposed for the location management, handover latency enhancement, they still have limit of local mobility region. In this paper, we propose a robust mobile video streaming in Heterogeneous Emerging Wireless Systems. In the proposed scheme, the MN selects the best-according to an appropriate metric-wireless technology for a robust video streaming service among all wireless technologies by reducing the handover latency and initiation time when handover may fail. Through performance evaluation, we show that our scheme provides more robust mechanism than other schemes.

• 한국정보과학회논문지:정보통신
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• 제37권2호
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• pp.122-134
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• 2010

자동차 관련 응용 프로그램에 대한 요구가 빠르게 증가되면서, 자동차 무선 네트워크에서 연속적이고 견고한 멀티미디어 서비스를 위한 필요성이 대두되고 있다. 이동성이 있는 환경에서 연속적인 서비스를 제공해주기 위해, 기본적인 이동성 프로토콜인 MIPv6은 물론 MIPv6의 문제점을 해결하기 위한 FMIPv6와 같은 프로토콜들이 개발되었다. 하지만, MIPv6, FMIPv6는 긴 핸드오버 지연시간과 패킷 손실 문제로 인해 멀티미디어와 같이 품질 보증이 필요한 서비스에는 사용할 수 없다. 따라서 본 논문은 자동차 무선 네트워크 환경에서 자동차가 처음 속해있던 액세스 라우터에서 만든 원래 임시 주소(oCoA : original CoA)와 뒷단 주소 중복성 검사(background DAD : Duplicate Address Detection)를 이용하여 연속적이고 견고한 멀티미디어 서비스를 제공해줄 수 있는 이동성 프로토콜을 제안한다. 성능평가를 통해 제안한 방식이 자동차 무선 네트워크 환경에서 제일 적합함을 증명한다.

• International Journal of Internet, Broadcasting and Communication
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• 제12권4호
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• pp.33-41
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• 2020

Nowadays, distributed mobility management (DMM) approaches have been widely adopted to address the limitations of centralized architectural methods to support seamless data transmission schemes in wireless sensor networks. This paper deals with the end-to-end (E2E) integration of Network Mobility (NEMO) basic support protocol in distributed wireless sensor network systems in structural health and environmental monitoring of social overhead capital (SOC) public infrastructures such as bridges, national highways, tunnels, and railroads. The proposed scheme takes advantage of the features of both the NEMO basic support protocol and partially distributed network-based DMM framework in providing seamless data transmission and robust mobility support. The E2E seamless data transmission scheme allows mobile users to roam from fixed-point network access locations and mobile platforms (i.e., vehicles such as cars, buses, and trains) without disconnecting its current sessions (i.e., seamless handover).

• 한국ITS학회 논문지
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• 제12권5호
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• pp.52-60
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• 2013

세계 각국에서 연구개발 중인 ITS 기술은 기존 도로 인프라의 효율성 극대화, 복잡한 교통문제 해결 그리고 운전자 편의 서비스 제공 등을 해결하기 위한 방안으로 기대되고 있다. 이러한 ITS 기술의 핵심은 서버가 교통정보를 수집하고 수집된 정보를 빠르고 정확하게 필요한 사용자에게 제공하는데 있다. 실제 주행환경에서는 차량과 기지국 주변에 수많은 통신장애요소들이 혼재함으로 ITS관련 서비스를 끊김없이 보장하기 위해서는 정확하고 잡음신호에 강인한 핸드오버 기술이 필요하다. 본 논문에서는 실제 차량용 통신장치에 구현된 WAVE 핸드오버 알고리즘을 소개하고 성능에 영향을 미치는 5가지 주요 파라미터를 도출하였다. 본 논문에서는 고속주행 시험도로에서 도출된 파라미터들에 대해 여러 값을 대응하여 각각의 조건에서 핸드오버 성능 변화를 분석하였다. 본 논문의 시험결과는 빈번하게 발생하는 핸드오버 핑퐁 문제 해결을 위해 핸드오버 알고리즘에 사용되는 파라미터 값을 얼마나 잘 설정해야 하는지를 설명해준다.

• 산업기술연구
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• 제28권B호
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• pp.245-250
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• 2008

Recently, mobile devices have supported wireless LAN as well as bluetooth, where the services such as heterogeneous network access and seamless mobility connection are important. Even though the mobility and physical network might be varied, an efficient communication mechanism for the network access and a robust mobility management of mobile devices are needed. In this paper, we design and implement a Bluetooth system with mobile LAN access capability. The proposed system has the following features; 1) IP connection is enabled by BENP in the link layer, 2) The networks devices of heterogeneous mobile devices are integrated into a single virtual network interface, 3) IP mobility between the bluetooth and wireless LAN is supported by mobile IP. The experimented results show that the packet loss and delay time during the handover duration is reduced by predicting the handover among different networks followed by the setup of any required parameters in advance.