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In vehicular ad hoc network, emergency warning messages exchange could improve vehicle safety. Emergency warning messages should be exchanged with high reliability and low delay. Currently, reliability of emergency warning messages is guaranteed by repeating broadcast. In current research, how many times repeated broadcast per second was not discussed. In this paper, a speed-based broadcast rate model...
In vehicular ad hoc network (VANET), vehicles are connected in a self-organized manner to collect and share various traffic data about the road condition, accidents, traffic congestions, and other related events, This data can be used to improve the driving quality, however VANET vehicles may receive unreliable data broadcasted by malicious vehicles which may result in unsafe driving and accidents...
Basic safety message(BSM) or heartbeat message is periodically broadcast by each vehicle on the road, conveying vehicle's instantaneous position and driving state. The vehicular communication network enables the fast exchange of BSMs with neighboring vehicles which assists drivers in acquiring the local driving environment and maneuvering promptly in case of any potential hazard. Such message is exceptionally...
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...
Reliably broadcasting safety information to neighboring vehicles is a big challenge in vehicular ad-hoc networks (VANETs), due to the dynamic network topology and the unreliable wireless channels. In this paper we present two decentralized cooperative schemes to enhance broadcast reliability by exploiting the advantage of message piggybacking. The key idea is to let each vehicle optimally piggyback...
Vehicular ad hoc network (VANET) is an important component for advancing the intelligent transportation system (ITS) to improve the traffic safety and enrich driving experience. In VANET safety applications, reliable and rapid dissemination of event-driven emergency messages is of great significance to obtain the traffic safety and efficiency. In this paper, we propose a RBEM/CBEM handshake mechanism...
Platooning is both a challenging and rewarding application. Challenging since strict timing and reliability requirements are imposed by the distributed control system required to operate the platoon. Rewarding since considerable fuel reductions are possible. As platooning takes place in a vehicular ad hoc network, the use of IEEE 802.11p is close to mandatory. However, the 802.11p medium access method...
Advancements in hardware, software, and computing technologies make the design and application of series and diverse kinds of networks deployment in several environments possible. An instance of such networks greeted with the enormous interest in research and industries is the vehicular ad-hoc networks (VANETs). Currently, information dissemination in the practical communication networks is achieved...
IEEE 802.11p is an approved amendment to the IEEE 802.11 standard and adds enhancements to 802.11 to be suitable for vehicular networks. Several researchers have evaluated the 802.11p in term of transmission range and propagation loss model. In this paper, we study a performance of a complex reliable broadcasting protocol on IEEE 802.11p in real public transport testbed. DECA, the density-aware reliable...
Most applications developed for vehicular environments rely on broadcasting as the main mechanism to disseminate their messages. However, in IEEE 802.11p, which is the most widely accepted Medium Access Control (MAC) protocol for vehicular communications, all transmissions remain unacknowledged if broadcasting is used. Furthermore, safety message transmission requires a strict delay limit and a high...
Vehicular Ad hoc Network (VANET) is the technology of building a robust Ad-Hoc network between mobile vehicles. A major application of VANET is safety warning. Broadcasting of safety messages requires an effective broadcast mechanism. Typically, selection of the probe node is the major problem in VANET broadcasting. The process of the probe node selection and broadcasting of safety messages must be...
Broadcasting plays vital role in vehicle-to-vehicle communication. However, it must face to challenges such as lack of acknowledgment, no retransmission, hidden terminals and low link quality that leads to unreliable communication because of message loss caused by collisions and poor link conditions. It is especially critical for safety messages in vehicular networks. To make broadcast more reliable,...
Vehicular ad-hoc network (VANET) is the one of core technologies that provides various services in intelligent transportation systems (ITS). Major services provided with multi-hop broadcasting communication are emergency warning service, forward collision warning service, and traffic information service. Frequent disconnections and low throughput due to high mobility of vehicles, fluctuant density...
Road accidents and traffic jams are the most important problems on the roads. Wireless Access in Vehicular Environments (WAVE) can be used as preemptive and informational measure. WAVE builds multi-path communication between vehicles and infrastructure nodes, where nodes share emergency and other information. In this paper we analyze the delay of emergency message transmission in multi-hop link, based...
Vehicle-to-Vehicle (V2V) communications can be a promising means for providing active safety in driving. Broadcasting can be an essential technology for the dissemination of safety information from a vehicle to vehicles and a roadside unit (RSU) to vehicles. In this paper we propose a reliably suppressed broadcasting protocol for V2V communications. The proposed protocol effectively selects forwarding...
Vehicular Ad-hoc NETworks (VANETs) adopting Dedicated Short-Range Communications (DSRCs) have emerged as a preferred choice of network design for the Intelligent Transportation System (ITS). A possible application of the ITS is to disseminate emergency messages by multihop broadcast. Due to the high density and high mobility of vehicles, it is difficult to design an efficient broadcast protocol for...
A primary goal of intelligent transportation systems (ITS) is to improve road safety. The ability for vehicles to communicate is a promising way to alleviate traffic accidents by reducing the response time associated with human reaction to nearby drivers. In addition the limitations of standard driving can be overcome by providing drivers with instantaneous information about complications up ahead...
Reliable broadcasting in vehicular ad hoc networks is challenging due to its unique characteristics including intermittent connectivity and various vehicular scenarios (car traffic is possibly very dense in urban areas or very sparse on highways). In this paper, we propose a new reliable broadcast protocol which is suitable for such characteristics. To address the issue of various vehicular scenarios,...
Multi-hop broadcast is a key technique to disseminate important information such as time-sensitive safety warning messages (WMs) in Vehicular Ad hoc Networks (VANETs). Due to the fact that the implementation of broadcast at the link layer uses unreliable transmissions (i.e., lack of positive ACKs), highly reliable, scalable, and fast multi-hop broadcast protocol is particularly difficult to design...
Most of the envisioned services over vehicular networks need to deliver information to all vehicles inside a certain region. Several such broadcasting protocols have been reported so far, but surprisingly only one of them addresses the issue of intermittent connectivity. In this paper, we present a broadcast protocol which is suitable for a wide range of vehicular scenarios and traffic conditions...
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