The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Vehicular Ad-Hoc networks (VANET'S) represent a rapidly emerging research field and are considered essential for cooperative driving among vehicles on the road. It is a kind of special wireless ad hoc networks which has characteristics of high node mobility and fast topology changes. To avoid accidents broadcasting of safety messages typically require to deliver the information to all vehicles travelling...
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...
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...
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...
As a fundamental network property, Inter-Contact Time (ICT) determines the critical performance metrics of a vehicular ad-hoc network (VANET). In this paper, we extract the contact information from the traces of Global Positioning System (GPS) from public and semi-public vehicles in a large modern city, including both buses and taxis. By exploring the spatial and temporal properties of the contact...
Vehicular Ad-hoc Networks (VANETs) are increasingly used to support critical services that improve traffic safety and alleviate traffic congestion. Developing VANET-based services and applications, however, is hindered due primarily to limited and often fluctuating communication capacity of VANETs that stem from the wireless and mobile nature of vehicle-tovehicle (V2V) communications. To address this...
Data dissemination over long distances in urban scenarios is the foundation of many VANET applications, but rapid shifting in network topology, unstable quality of wireless communication and channel capacity constraints of VANETs pose many challenges to data dissemination. In response, we propose a connectivity-aware data delivery mechanism on the basis of an improved greedy broadcasting. Moreover,...
Considering vehicles as sensors for traffic and pollution information is a new paradigm to monitor the environment and to open the way to an efficient smart navigation. In this work we focus on the uplink acquisition of traffic information from vehicles toward a remote control center. With the increase in the number of vehicles equipped with on board units (OBUs) enabling cellular transmissions, this...
This paper presents the URBAN XOR1 protocol, an XOR-based flat routing mechanism developed for vehicular ad hoc networks (VANETs) formed in urban scenarios. The paper firstly describes the URBAN_XOR routing principle, which requires reduced knowledge about the set of nodes present in the VANET in order to provide traffic forwarding. Basically, the URBAN XOR protocol introduces the concept of local...
We investigate the benefits of distributed storage using erasure codes for file sharing in vehicular networks through realistic trace-based simulations. We find that coding offers substantial benefits over simple replication when the file sizes are large compared to the average download bandwidth available per encounter. Our simulations, based on a large real vehicle trace from Beijing combined with...
By means of recent advancements in the wireless networking area a totally new paradigm came into existence in the domain of wireless communication well known as Vehicular Ad-Hoc Network (VANET) employed specially for providing road safety, comfort and convenience to the driver as well as passengers during their journey. A VANET is a type of highly dynamic wireless network that can be formed without...
Data dissemination is a key component of Infotainment and safety services in Vehicular Ad Hoc Networks. For infotainment services data dissemination starts from a Road Side Unit (RSU) and propagates to a multiplicity of On Board Units (OBU). A RSU typically can reach with a single hop only a fraction of the interested vehicles. Multi-hop, inter-vehicle communications is necessary to reach vehicles...
Intersection collision warning system has been widely studied with the progress in wireless communication technology and positioning devices, which are now increasingly available on smart phones. In this paper, we present an Intersection Collision Warning (ICW) system using Wi-Fi smart phones with built-in GPS receivers for vehicular ad-hoc networks. In the system, smart phones first retrieve safety-related...
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...
In recent works, a priority-aware deterministic access protocol that is based on 802.11p/DSRC was introduced to allow vehicles to access the shared medium in collision-free periods. The VANET Deterministic Access (VDA) protocol as introduced in [8] has no mechanism that prevents a non VDA-enabled vehicle from accessing the channel in a scheduled VDA opportunity (VDAOP). A non VDA-enabled vehicle,...
The fast moving of nodes will cause the frequent change of network topology which makes the data dissemination of VANET (Vehicular Ad-hoc Networks) challenging. This paper proposes a data dissemination strategy which is called the Adaptive Connectivity Data Dissemination Scheme (ACDDS), that is, the nodes calculate the network connectivity in current areas by the distributed nodes density perception...
To improve driving comfort and provide entertainment services, vehicular communication networks (VCNs) have appeared as an emerging solution, which consists of road-side units (RSUs) and on-board units (OBUs) to distribute multimedia contents. However, as most of OBUs always request the stored contents in the RSUs, how to update the contents in these RSUs when the original changes at its original...
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...
In Vehicular Ad Hoc Networks (VANET) broadcasting is the key means for dissemination of safety messages. Existing broadcasting schemes, however, result in broadcast storm problem. On the other hand, setting up maximum broadcast range is another critical issue for successful communication. Based on the neighbor vehicle density, we intend to mitigate the broadcast storm problem. We also try to reduce...
Vehicular ad hoc networks (VANETs) are a highly mobile wireless ad hoc networks that are targeted to support vehicular safety, traffic monitoring, and other applications. VANET applications are inherently broadcast oriented and require communication protocols to be reliable and scalable. Simple broadcast flooding satisfies these requirements, but its performance is highly dependent on network density...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.