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차량간 통신환경에서 비안전 서비스를 위한 멀티홉 유니캐스트 라우팅 프로토콜에 관한 연구
백송운(Songyun Bai),백송남(Songnan Bai),곽수진(Sujin Gwak),문희석(Huiseok Mun),정재일(Jaeil Jung) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
VANET routing protocols are designed to deliver data packets to their intended destinations using available vehicles as relays. Vehicular networks exhibit unique properties such as a possibly large number of vehicles, high dynamics, and fast-changing vehicle densities and partitions. Even if a large population of vehicles are present, constrained mobility, traffic lights, intersections and the liked lead to frequent network partitions and an uneven network density. The proposed GeoUnicast routing protocol use the realtime multi-hop forwarding for efficient and reliable transmission. GeoUnicast was evaluated in different highway traffic scenarios with both a realistic channel model and 802.11p model in our simulation.
VANET 환경에서 차량 안전 서비스를 위한 경쟁 기반 브로드캐스트 기법의 성능 분석
엄두진(Doojin Um),백송남(Songnan Bai),정재일(Jaeil Jung) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In recent years, with the introduction of intelligent vehicle technology, the vehicle system for enhancing driver safety is rapidly evolving from the existing Passive Vehicle Safety System to Active Vehicle Safety system, e.g., Co-operative Collision Warning (CCW). Vehicular Ad-hoc NETworks (VANETs) are considered as the most suitable wireless communication system targeted to support vehicular safety applications. In VANET environment, contention-based schemes are suggested in order to mitigate broadcast storm problem. These schemes determine re-broadcasting nodes by contention among the nodes receiving safety message. In this paper, we perform the evaluation of the existing contention-based schemes by applying two types of highway scenarios. The simulation results show that the DDB1 and slotted 1-persistence are perform better than pure flooding and weighted p-persistence in terms of message delivery latency, message delivery ratio and message re-broadcasting ratio.
차량간 통신 기반 안전 서비스 평가를 위한 통합 시뮬레이터 설계
오준호(Junho Oh),백송남(Songnan Bai),문희석(Huiseok Mun),곽수진(Sujin Gwak),정재일(Jaeil Jung) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The cooperative communication systems in vehicular environment should be quite expected to make the driving more safety and convenience. Nevertheless, it is very hard to evaluate and measure on the effect of new safety application in the real situation. This paper presents a novel integrated simulator for design and verification of communication protocols and safety applications in reliable vehicular environments. The simulator supports the full function of IEEE802.11p and WAVE (Wireless Access in Vehicular Environment) protocol stack which are generally accepted for vehicular communication systems. Especially, the simulator provides the function of performance evaluations that engineers can measure the effect of new safety application in vehicular environment without testing it in real world.