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In vehicular ad hoc networks (VANETs), broadcast is a common operation to provide a vehicle to disseminate traffic information or warning messages to all the other vehicles. This paper proposes a distributed adaptive media access control (MAC) protocol, called DA-MAC, to dynamically select proper vehicles to form a connected virtual backbone for provision of efficient broadcasting in VANETs. The proposed...
As vehicular networks (a.k.a. VANETs) continue to mature, the benefits they promise come closer to reality. For this to happen, both security and privacy must be provided. Particularly in dense urban environments, novel methods of distributing the often changing identity (pseudonyms or PNs) of the vehicles is necessary in order to ensure vehicles have sufficient PNs. In this paper, we examine three...
Vehicular Network is one of the most growing type of wireless network. In such system lot work is being done. There are number of issues with Vanet like the security, congestion, intelligent system etc. We are also taking one of such problem of vanet called the intelligent system. In vehicular network the complete automation is always the main problem. While working with vanet the working geographical...
The European Electronic Toll Service (EETS) allows different possibilities for the overall system design of interoperable toll systems. We study the effect of the overall system design on the operational costs using a model based, holistic, executable specification. The model is set up to give an accurate description of the interdependences as seen in the German toll system. Two different scenarios...
In a vehicular ad hoc network, vehicles can communicate with their correspondent nodes through the Internet using various wireless technologies. This kind of wireless networks brings a lot of new applications to metropolitan networks, such as online games, VoIP, etc. However, compared with traditional wireless networks, the high speed of vehicles and the limited transmission range of antennas introduce...
High mobility of nodes is an important challenge of vehicular ad hoc networks (VANETs). Contention based forwarding protocols have well congruity with high mobility of nodes in VANET. These protocols need neither already existed route nor information about neighbors of current forwarder. But these select next hop in distributed manner using Dynamic Forwarding Delay (DFD) that is a kind of timer. In...
Using the new wireless capabilities in vehicles, various applications have appeared in Vehicular Ad Hoc Networks (VANETs). Multimedia data sharing is one of such applications, which has recently been given so much attention. Most presented schemes in this field are focused on direct opportunistic meetings between vehicles or request/response broadcast in the whole network, which are inefficient and...
To cope with millions users becoming increasingly connected to Internet on the move, location-based services may be better supported by decentralized infrastructures enabling improved scalability, access rate and resiliency. In this context, our previous work introduced the Distributed Geographical Table (DGT), an overlay scheme that builds and maintains virtual neighborhood relationships between...
In VANETs and MANETs, the topology of the network changes very often, therefore implementation of efficient routing protocols is very important problem. In this paper, we investigated the good put of AODV, OLSR and DYMO routing protocols using CAVENET (Cellular Automaton based Vehicular Network). The simulation results show that the number of hops for DYMO is smaller than AODV and bigger than OLSR...
Communications in highly mobile vehicular networks are challenging and have gained great attention in recent decades. One promising candidate is the IEEE 1609/802.11(p) network standard suite [1][2][3][4][5][6], which is evolved from the commodity 802.11 technology and revised for vehicular environments. Over the non-safety applications in vehicle networks, group communications are expected to enhance...
In this paper, we investigate the IEEE 802.11p based Vehicular Ad-hoc Network transition between non-saturation and saturation regimes with mobile nodes. We combine vehicular traffic theory, queuing model and Markov chain to evaluate the performance of the network under spatial or networking saturation for mutiple data classes over control and service channels with different transmission rates depending...
Intelligent Transportation Systems (ITS) aggregate, analyze and display geographic- and temporal-specific sensor information to reduce congestion while promoting safety. Until now, the coverage and potential of ITS have been restricted by the excessive cost of deploying the required road sensor and communications infrastructure. Our solution to this problem is focused on a novel integrated ITS Network...
Vehicular networks ensure that the information received from any vehicle is promptly and correctly propagated to nearby vehicles, to prevent accidents. A crucial point is how to trust the information transmitted, when the neighboring vehicles are rapidly changing and moving in and out of range. Current trust management schemes for vehicular networks establish trust by voting on the decision received...
Vehicular Ad hoc Network (VANET) is a new way of communication which includes communication between vehicles moving at high speeds on the roads. VANET developed several new applications like traffic engineering, traffic management, provides emergency information to avoid accidents and other user applications. VANETs are similar to Mobile Ad hoc Networks (MANETs) but with different characteristics...
In this paper, we propose a group handover scheme in heterogeneous vehicular networks, which seeks to not only maximize system throughput but also make sure the load of all candidate access networks are maintained at the target load level. With mobility prediction information, we formulate the handover scheme as a multi-assignment problem, and develop an auction-based method to solve such problem...
Road accidents and traffic jams are common problems being the target of a lot of research works to be resolved in current traffic system. Vehicular Ad hoc Network (VANET) is commonly part of Intelligent Transport System (ITS) which is directly involved in handling these problems and aims to make journey on road comfortable. In this paper, vehicular SMS system (VSS) is proposed based on cellular network...
The KOMOBAR project utilizes a software agent based approach to create a decision support system for the purpose of optimizing logistic processes in the agricultural domain. This domain requires a flexible approach, which has the ability to work decentralized. The paper explains an architecture for software agent based decentralised decision support structures and discusses the problems of mobile...
The UAN - Underwater Acoustic Network - project has among its goals the investigation of networked communication modalities in which mobile nodes are located in the environment in order to optimize the communication characteristics of the acoustic channel. The mobile network nodes in UAN are placed on Autonomous Underwater Vehicles (AUVs) carrying appropriate acoustic modems and capable of autonomous...
This paper presents an idea and a construction details of the tiny sensor-based robot-vehicle as a mobile hardware platform for Wireless Ad-hoc Sensor Networks (WSN). The main scope of the research was design and implementation of the mobile platform, allowing the WSN nodes to autonomously change its location in active way. The designed platform had been integrated with sensor node and provided with...
Location and context awareness services have generated a lot of interest in the recent years, becoming a key feature to many applications of mobile devices. The rapid development in wireless communications and in satellite navigation systems also contributed to the popularity of location based services. The location technologies when properly combined can provide valuable event driven services to...
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