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We propose a multi-hop reliable broadcasting (M-HRB) scheme suitable for a wide range of vehicular ad-hoc network (VANET) applications in urban setting. Multi-hop reliability is performed using local state information. Basically, a street is divided into multiple cells to form grid-like zones. We apply a proactive local state processing scheme exploiting features of periodic beacons to estimate wireless...
The number of automotive Advanced Driver Assistance Systems with safety-related functions is increasing rapidly. Even autonomous vehicles are expected to be on the road in the near future. Electrical systems are having to meet increasingly high safety requirements, which also apply for the network level. In this paper we show how the Ethernet-based in-car-communication process can be modeled with...
Autonomous platoon control is a promising auto drive technology. It frees drivers from stressful driving task and offers comfortable car trip experience. It is also expected to contribute to energy savings. In platooning control systems, beacon messages have an important role. Each member vehicle controls its acceleration according to the information of the position, speed, and acceleration included...
In vehicular communications, the current standards can be applied for safety-related message exchange but in the future world, other new applications like autonomous controlled vehicles require more reliability and capacity with small delay. Moreover, the harsh communication environment is one of the most difficult challenges. The line-of-sight (LOS) component of the signal in inter-vehicle connectivity...
In this paper, we propose a reliable dual-radio based DSRC channel assignment scheme and a new application- level based receiver-oriented repetition (AROR) scheme for one-hop event-driven emergency message broadcast in vehicular ad hoc networks (VANETs). The new scheme takes advantage of DSRC dual-radio devices to provide preemptive access for one-hop event-driven safety services without conflicts...
Vehicular Ad hoc NETworks (VANETs) should provide the reliable safety message broadcasts and the efficient non-safety message transmissions to vehicles. The IEEE 1609.4 MAC, which supports multi-channel operations in VANETs, is not reliable enough for the safety message broadcast and not efficient in the Service CHannel (SCH) resources utilization. In this paper, we propose a MAC protocol which supports...
Vehicular ad hoc networks (VANETs) drive new challenging research issues at different layers of the protocol pillar, from physical to application. Focusing on the medium access layer, one of the most promising and not yet fully explored option is the adoption of orthogonal frequency division multiple access (OFDMA). Besides guaranteeing high spectral efficiency and effective resource allocation, it...
To improve safety, a warning message in VANETs should be delivered both reliably and urgently. Existing solutions either tend to compromise propagation delay or do not reach high reliability due to broadcast storm problem caused by excessive retransmissions. We propose ReC, which exploits geographical information to help nodes autonomously achieve agreement on forwarding strategies. Each forwarding...
An efficient traffic system is needed for safety of lives, property, time and economy. Here we present a design and implementation of low cost, low power consummated and more reliable an Infrared based intelligent Traffic System. The system is a wireless network based which contains infrared transmitter with a unique identification number and infrared receiver. The system can response rapidly with...
IEEE- and ASTM-adopted Dedicated Short Range Communications (DSRC) vehicle safety-related communication services, which require reliable and fast message delivery, usually demand broadcast communications in vehicular ad hoc networks (VANETs). In this paper, we propose and justify a distributive robust scheme for DSRC one-hop safety-critical services. The new scheme enhances broadcast reliability using...
Broadcast is a typical message dissemination mechanism for emergency notifications, traffic information, notice and advertisement messages in VANETs. In this paper, we identify the cases that the broadcast message cannot be propagated with the Contention-Based Forwarding approach which is one of the most representative dissemination approaches for VANETs and propose road-based broadcast message dissemination...
Data dissemination is an important technology for most VANET applications. Due to the physical factors like traffic lights, the density of vehicles is usually uneven. Areas near intersections often have a high node density while areas near the center of streets can have a very low node density. The uneven distribution of nodes and the movement pattern of vehicles cause intermittent connections and...
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