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Reliable multi-hop forwarding in vehicular networks is required by many critical Intelligent Transportation System (ITS) safety applications. Cooperative vehicular multi-hop schemes achieve reliability using broadcast transmissions and multiple forwarding relays at each hop. However, packet duplication must be controlled to circumvent the broadcast storm problem. This paper proposes the Cooperative...
European Telecommunication Standards Institute (ETSI) is standardizing the 3GPP Long Term Evolution Advanced (LTE-A) relay nodes (RNs) which are intended to be used for providing enhanced cell edge coverage and capacity. We present simulation results on the prospected LTE-A mobile relay node (MRN) applications. The future vehicles can communicate with their environment by exchanging information with...
Vehicular ad hoc networks (VANETs) based on IEEE 802.11p are moving new safety and traffic applications beyond the present limitations given by infrastructures. However, due to the high variability in time and position of nodes, the medium access control layer of IEEE 802.11p, which is based on carrier sensing multiple access with collision avoidance (CSMA/CA), could lead to severe performance degradation...
Multiple channels have been allocated in the 5 GHz spectrum for vehicular communications in USA and in Europe. Due to the limited spectrum, simultaneous communications may occur over nearby channels and be affected by adjacent channel interference (ACI). To protect safety messages delivered on the control channel (CCH), the most likely approach is to prevent the use of adjacent channels with the consequence...
In this paper we consider a vehicular sensor network in which vehicles are equipped with video cameras and continuously capture images from urban roads. Then, vehicles can use roadside wireless access points (APs) encountered during travel to deliver recorded image data to remote data collectors, where images streams from multiple sources are aggregated and processed. However, how to efficiently utilize...
Urban traffic congestions have become a financial and societal burden in many cities. Efficient traffic management solutions mitigating such congestions require a reliable modeling and estimation of traffic jams. In urban traffic, the modeling challenges are related to flow collisions and gridlocks created at intersections. In this paper, we propose a traffic light extended Cell Transmission Model...
The traffic congestion problem is a common issue for the residents of metropolises. Although expanding the capacity of transportation systems and stimulating the public transportation may decrease the traffic congestion, they cannot completely solve the traffic congestion problem. As a solution for the worsening traffic congestion problem in urban areas, road pricing systems have been employed. In...
It is common for vehicles in a vehicular ad hoc network (VANET) to exchange information by broadcasting beacon messages periodically. This information is required not only for routing protocols when making routing decisions, but also for safety applications. Choosing a suitable interval for broadcasting beacon messages has been considered a communication challenge since there will be a trade-off between...
As a special form of mobile ad hoc network (MANET), vehicular ad-hoc network (VANET) is expected to support communication between vehicles, and between vehicles and stationary infrastructures, such as access points (APs). However, due to the highly mobile characteristics of VANET, the direct connection between source vehicles (SVs) and APs might be inaccessible. In this case, relay vehicles (RVs)...
Point-to-point data delivery in Vehicular Ad hoc NETworks (VANETs) has been a challenging issue due to the vehicle movement, limited wireless resources and lossy feature of wireless channel. In VANETs, due to the frequent topology changes, traditional ad hoc routing protocols incur a high overhead for the route maintenance. In this paper, we propose a new approach to route data messages in VANETs...
In this paper, we present a routing scheme called Junction-Based Traffic-Aware Routing (JTAR). This scheme dynamically elects a non-static vehicle at each junction to function as a temporary access point and adopt a traffic information collection mechanism to obtain real-time traffic and network information. Based on the collected information and the degree by which the outgoing roads of each junction...
VANET plays an important role in dissemination of traffic and emergency information among vehicles moving on roads. This information is used by various vehicular applications like safety applications, route guiding applications etc. However, because of high mobility of vehicular nodes, maintenance of routing tables generates high network traffic. In this paper we have proposed an optimization of Zone...
With the increasing demand for traffic safety and efficiency and constant search for innovative solutions within the automotive market coupled with supporting initiatives from regulatory domains, the potential of Intelligent Transportation Systems (ITS) is immense. Basic vehicle and roadside infrastructure collaboration allows an increase in efficiency and safety and acts as the foundation for an...
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