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Major applications of Vehicular Ad Hoc Networks (VANETs) are strongly related with safety applications like emergency warning, rescue operations, information about road conditions and accident alert. However, little attention has been given to the design of comfort applications with social approach, such as the connecting of people with common interests (like twitter or SMS services). Most of the...
It is becoming more and more common to use Autonomous Underwater Vehicles to perform tasks underwater. The use of this vehicles is affordable and its use doesn't raise any significant risk nor does it requires any human intervention. The traditional applications for the use of such vehicles were related with bathymetric tasks. But nowadays AUVs are being more and more used for variety of missions...
Efficient data delivery in vehicular ad hoc networks (VANETs) is particularly challenging due to the unique characteristics of VANETs, such as fast topology change, frequent disruptions and rare contact opportunities. We observe through empirical study that a considerable amount of packets cannot be delivered within time-to-live (TTL). The wide use of third generation (3G) networks inspires us to...
The current Medium Access Control (MAC) protocol of the Wireless Access in Vehicular Environments (WAVE) system does not consider time utilization of CCH and SCH. In this paper, we present a novel mechanism to extend MAC protocol, which dynamically adjusts the length of Control Channel (CCH) and Service Channel (SCH) intervals according to vehicle density and load conditions of network. In the proposed...
Vehicular Delay Tolerant Networks (VDTN) are used to distribute a large amount of mobile data by high-capacity device-to-device communication. Given a number of available vehicles in VDTN, the current vehicular data sharing models always utilize all of them to achieve the best effect, failing to balance the performance gained and cost of employing them. Taking the cost into account, we study the problem...
Floating car data (FCD) has been used to collect traffic state information from a set of individual vehicles. Vehicles are equipped with On Board Units (OBU) that collect different measurements and the vehicle position and transmit the data to a remote control center. In current implementations of FCD systems, vehicle fleets use cellular connections for data transmission. In this paper we consider...
As the use of Plug-in Hybrid Electrical Vehicles is expected to rise, their rather high energy consumption and long charging times has the potential to impact power grid stability. While coordinated charging is generally considered the answer to such issues, often overlooked aspects in coordination schemes are reliability, fault tolerance and ease of implementation. In our research we adapt an existing...
Disruptions, high dynamism and no end-to-end communication are some of the Vehicular Delay-Tolerant Networks (VDTNs) main characteristics. This paper describes the implementation of a new VDTN multicast routing protocol which makes use of knowledge about previous encounters to estimate congestion and density and better spread data bundles and limit the number of copies to reduce overhead. After a...
In this paper, we propose a cooperative media access control (CMAC) protocol to improve the packet reception ratio and to reduce the average delay for multi-hop transmission. The proposed protocol shows better packet delivery ratio and less delay than the IEEE 802.11p MAC protocol for multi-hop transmission.
Inter-Vehicle Communication (IVC) is an important research and future application topic which experiences increasing attention from all major car manufacturers. This paper describes a Self-Organizing Traffic Information System (SOTIS) which is purely based on IVC and which does not need any expensive infrastructure. A SOTIS car is equipped with a satellite navigation receiver, a digital map and a...
Inter-vehicle communication is considered as a major problem to vehicular environment. Here, an analytical framework is developed to investigate the reliability of end-to-end information relay process along a platoon of vehicles. The reliability of inter-vehicle communication is measured by the probability of success for information to travel to a known destination and by the required number of hops...
We propose a novel position-based routing protocol Anchor-based Connectivity Aware Routing (ACAR) for Vehicular Ad-hoc Networks (VANETs), which considers both buses and cars as vehicular nodes running in both clockwise and anti-clockwise directions. ACAR is a hybrid protocol, uses both the greedy forwarding approach and the carry-store-and-forward approach to ensure the connectivity of the routes...
Data dissemination in vehicular ad hoc networks (VANETs) has recently received considerable attention. Due to the unique characteristics of VANET, the implementation of reliable data dissemination among vehicles has encountered many challenges. In this paper, a reliable and efficient data dissemination scheme is presented. Relative locations between neighbor vehicles are predicted to improve delivery...
Routing protocols design is an important and essential issue for Vehicular Ad Hoc Networks. In this paper, a more realistic simulation environment is developed based on VanetMobiSim and OPNET, and the performance of several classical routing protocols such as Optimized Link State Routing (OLSR), Geographic Routing Protocol (GRP), Ad hoc On Demand Distance Vector Routing (AODV) and Dynamic Source Routing...
Mobility of terminals would bring changes of network topology. In dense VANET multi-hop communication with nodes of high speed, a problem how to choose a next hop relay rapidly made a significant sense. In this paper, a slot assignment for voice access named Black-burst scheme based TDMA was proposed for channel access contention. The problem of relay selection could be solved as a method of voice...
Now the mainly research on the protocol of mobile vehicle network is based on connected networks. But this method has its limitations. The majority nodes in this network have the constraint that they have sufficient density and moderate mobility. In fact, the nodes in highway environment have very high speed and the network topology changes very quickly. This makes the link between nodes instability...
In order to study the influence of different vehicles to incident delay, traffic simulation is applied to make the delay predictions. Three major parts, respectively the establishment of simulation platform and parameter calibration, survey and calculation of traffic data, and case study, are described in the paper. For the establishment of simulation platform and parameter calibration, at first,...
Mixed traffic denotes the coexistence of two driving styles: human and automated driving. Until now, there has been an ambiguity about the driver's safety in mixed traffic. Traffic safety studies focus on a synthesis of control laws which help drivers to avoid or mitigate collisions. Classic safety descriptors use only the time to collision, a time criterion for safety assessment. Other assess traffic...
The paper develops a heuristic optimization algorithm for automated vehicles (equipped with cooperative adaptive cruise control CACC systems) at uncontrolled intersections using a game theory framework. The proposed system models the automated vehicles as reactive agents interacting and collaborating with the intersection controller (manager agent) to minimize the total delay. The system is evaluated...
Eco-Cooperative Adaptive Cruise Control (ECACC) systems are a type of Cooperative Adaptive Cruise Control (CACC) that compute the most fuel-efficient (or near-fuel efficient) vehicle trajectory using available information regarding roadway characteristics, set-speed, upcoming signal changes and interaction with other vehicles. ECACC leverages information transfer between vehicles and infrastructure...
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