2013 13th International Conference on ITS Telecommunications (ITST)

In Intelligent Transportation Systems (ITS), disseminating warning messages in a timely and efficient way through wireless short-range communications can save many lives and reduce traffic congestion. A geographical broadcast protocol provides data delivery to specified geographical areas, using multi-hop communications if needed. Among the main challenges for such protocols are forwarder selectio... View full abstract»

To support applications for environment perception in Vehicular Ad-Hoc Networks (VANETs), vehicles send Cooperative Awareness Messages (CAMs) via wireless broadcast to inform other vehicles about their status. Each message received by a vehicle is processed by several application modules that run on hardware with limited resources whose capacity is not yet defined. Therefore, the received rate of ... View full abstract»

In a vehicular ad-hoc network (VANET), the network topology may change frequently. Consequently, the key design issue is how to organize nodes effectively such that the topology can be stabilized quickly. In order to balance the load among the nodes and govern the topology change, a group formation scheme using localized criterions is implemented. The proposed distributed topology control method f... View full abstract»

Intelligent Transportation Systems (ITSs) have been attracting tremendous attention in both academia and industry due to emerging applications that pave the way towards safer enjoyable journeys and inclusive digital partnerships. Undoubtedly, these ITS applications will demand robust routing protocols that not only focus on Inter-Vehicle Communications but also on providing fast, reliable, and sec... View full abstract»

The inter-vehicle communication (IVC) systems based on CSMA/OFDM scheme such as IEEE802.11p or ARIB STD-T109 in Japan are widely developed because autonomous distributed networks are easily made by using the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) MAC protocol. However, the hidden terminals in CSMA networks cause the performance degradation. In our previous study, a new IV... View full abstract»

Understanding the impact of traffic incidents, not only can help decision-makers choose a better strategy, but also provide travel recommendations for travelers. This paper uses real GPS data collected from probe vehicle to analyze the impact of incident in urban traffic network. Queuing length and incident duration are used to evaluate impact level incident. Then, a traffic incident pattern class... View full abstract»

We present a method for clustering vehicles that are in the same congested traffic flow. Our goal is to provide a mechanism for sharing information between vehicles in the same situation to ease traffic congestion in urban areas. Because the most accurate source of information about the congested traffic flow is the vehicle at the head of the traffic flow, it first needs to be identified. To do so... View full abstract»

Accurate bus trajectory data is the basis of many public transportation applications. However, trajectory data sampled by GPS devices contains notable direction errors. We cannot determine the travelling direction of the bus through trajectory data. To address this problem, we utilize k-nearest neighbor algorithm (K-NN) to determine the direction of the bus trajectory. Meanwhile, the voluminous bu... View full abstract»

The UNs projected that half of the world's population would live in urban areas at the end of 2018. By 2050 it is predicted that 64.1% and 85.9% of the developing and developed world respectively will be urbanized. This incredibly rapid growth of megacities causes severe ecological, economical and social problems. The rapid growth of megacities and vehicles are causing a severe fuel consumption an... View full abstract»

In emerging vehicular communication systems, each vehicle periodically broadcasts safety messages, which contains various vehicle parameters such as location and velocity. While safety messages are designed for advanced road safety and traffic efficiency, a significant concern is that eavesdroppers can track the vehicle's trajectory. In particular, this tracking is easily performed in low vehicle ... View full abstract»

This paper investigates the Optimal Cooperation Scope (OCS) for Cooperative Bandwidth Sharing (CBS) in vehicular networks. Three relay schemes based on optimal single path relay and opportunistic relay for multihop CBS are proposed and studied. The OCS is solved as the maximum physical distance or hops between the bandwidth requester and bandwidth helper in the optimal solution to maximize the CBS... View full abstract»

The problem of modelling V2X system based on partial (RSSI) measurements of the wireless propagation channel is considered. The study shows that the dual slope linear model well approximates pathloss in the V2X systems. We also show that in addition to distance dependent pathloss, incorporation of fast fading as well as its frequency selectivity have significant effect on the overall performance o... View full abstract»

Vehicular Ad-Hoc Networks (VANETs) are a long-term solution contributing significantly towards Intelligent Transport Systems (ITS) in providing access to critical life-safety applications and services. Although Vehicular Ad Hoc Networks (VANETs) are attracting greater commercial interest, current research has not adequately captured the real-world constraints in VANET handover techniques. Therefor... View full abstract»

Wireless communication provides convenience service for mobile devices. Considering different wireless characteristics, e.g., WIFI and 3G/4G, a mobile device user may manually change its wireless connection. For intelligent devices, users hope to keep the cooperative networking to work in background automatically. The paper introduces a new method of triggering cooperative networking among portabl... View full abstract»

In this paper we present a novel contribution work, describing a system that helps to detect urban areas with high density of incidents or risk situations. Our system has a perception and pre-collision system that feed an expert system aimed at detecting dangerous situations. All incidents gathered by the vehicles are sent to a global repository, and its data is processed for detecting urban hotsp... View full abstract»

In this study, dynamic ramp metering approach has been applied on Levent ramp of Istanbul Outer Beltway (O-2) on which Fatih Sultan Mehmet (FSM) Bridge is located. In this context, field measurements at the related highway intersection have been obtained from highway authority in order to determine the pattern of the traffic, which fluctuates all day long. The most important output of the study is... View full abstract»

Nowadays with the proliferation of a panoply of smartphones and tablets on the market, almost everyone has access to mobile devices, which offers better processing capabilities and access to new information and services. Taking this into account the demand for new and more personalized services which aid users in their daily tasks is increasing. Current navigation systems lack in several ways in o... View full abstract»

Although the floating car data contains detailed behavior of vehicles, most researches utilizing the floating car data mainly focus on providing link-level, large-scale traffic estimation because raw floating car data usually contains location and speed errors due to the characteristics of on-board sensors such as GPS and tachometers. Such errors are usually vehicle-dependent and considered hard t... View full abstract»

Currently, most traffic lights at street intersections operate according to a fixed setting. However in reality, vehicle flow rates of each direction are not always equivalent. As a result, the traffic light at the vertical roadway may turn red when no car is driving on the horizontal roadway, or remain in red when all cars on the horizontal roadway have passed the intersection. In this paper, we ... View full abstract»

Ad hoc network is composed of mobile nodes without infrastructure. Depending on a hop-by-hop basis of connection, communications between high-mobility nodes are accomplished via cooperative forwarding. Especially, the vehicular ad hoc network (VANET) is a technology that uses moving cars as nodes to create a mobile network or implement vehicle-to-vehicle (V2V) connection. However, the discussion a... View full abstract»

Location Based Services require seamless tracking of human or object outdoor/indoor anywhere, everywhere. Based on its location and availability, it should make use of the underlying wireless system it has access to or it could process. In terms of vehicular system also, it requires seamless tracking also in the indoor parking or places where it lacks clear LOS and has to depend upon the widely ac... View full abstract»

Modern Intelligent Transport Systems (ITS) are based on specific services that are hosted at the edge of network infrastructure. These services are created using the vehicle embedded computing appliances, private cloud resources and global available information services. Within proposed approach all vehicles are considered as mobile part of low level operation network that providing low latency an... View full abstract»

Vehicular Delay-Tolerant Networks (VDTNs) were proposed as a solution to overcome some issues found in other vehicular technologies. VDTNs assume the bundle layer placement under the network layer. This vehicular architecture can be applied in sparse regions characterized by sparse connectivity, long propagation delays, high error rates, and short contact durations. Although some of the major issu... View full abstract»