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Mobile Vehicular Clouds are emerging as systems architectures suitable to provide services to both drivers and external customers. The paper describes a Pics-on-Wheel architecture and prototype implementation based on the idea of open mobile cloud. A simulation study based on San Francisco taxi cab traces shows that the Pics-on-Wheel service yields latencies in the order of 5 minutes in well frequented...
The paper presents a set of mobile applications aiding the visually impaired in using the public transport. A user equipped with a modern smartphone with mobile data transmission and positioning capabilities can access location related context information. Keeping up the connection with dedicated system servers gives the user access to additional services, e.g. enables the use of passenger information...
Location based services (LBS) are considered very relevant for the users of mobile networks. All local events and facts related to area nearby seem to be more important that others which happen in remote places. Localization data is used in all types of services: weather, traffic, tourist info, etc. One of its most important (and regulated by law) applications is providing persons location in case...
We are using a detailed realistic discrete event simulation model of the automatic German toll system to study resource usage of the mobile data network for various system configurations. Starting with an existing simulation model [1] we describe the driving patterns used in the simulation and the functionality added to the simulation model. Next we explain enhancements in simulation performance implemented...
In this paper, we propose a novel data forwarding method for efficient data gathering in wireless sensor networks with multiple mobile sinks which freely move in the target region. In our proposed method, each sensor node recognizes its status of connection with mobile sinks based on the number of received beacons periodically emitted by each mobile sink. In addition, information on that status are...
In this paper we report about a measurement campaign aimed at verifying the correlation between the model of cellular device and the QoS perceived by end-users of mobile voice services. The campaign has been jointly conducted with the two main Italian network operators, Telecom Italia and Vodafone, in order to gather network independent measurements associated with well-known QoS indicators for voice...
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...
The article begins with the particularity of the 3G user in high-speed railway, then divides the user terminals into different groups according to the regularity of the movement, and takes the method of appropriate location management to save the overhead of paging. Oriented paging is used for the stationary user, tracking paging is used for the regularity mobile user, and queued packet paging is...
In this work, we evaluate the performance of DYMO routing protocol in different VANET scenarios. We investigate the effect of density and speed in the performance of communication between nodes using different node densities and speeds for the same simulation area. As evaluation metric, we use Packet Delivery Ratio (PDR). The simulation results have shown that with the increasing of the nodes density...
This paper evaluates the conditional connectivity performance for vehicular ad hoc networks. Conditional connectivity is the probability that a communication pair can stay connected during a whole data transmission conditioned on the connection is successfully built up when the transmission is initialized. To analyze the conditional connectivity, a simplified but reasonable unidirectional highway...
Airborne mobile sensor network, which is composed of sensor nodes integrated airborne vehicles, draws the attention of many interesting topics in multifarious areas, such as environmental monitoring, battlefield surveillance or disaster management. In this function specific network, some application based rules should be obeyed completely, such as signal jamming, collision avoiding, formation matching...
Vehicular Ad-hoc Networks (VANETs) represent a rapidly emerging, particularly challenging class of Mobile Ad-hoc Networks (MANETs). VANETs are expected to be massively deployed in upcoming vehicles, because their use can improve the safety of driving and makes new forms of inter-vehicle communications possible as well. Because they are characterized of high mobility and dynamic topology change, congestion...
Vehicles move so fast that they always cause the handover delay problem in the Vehicular Ad Hoc Network (VANET). This problem will lower down the throughput of the network and make the mobile devices' connection to the Internet ineffectively. To solve this problem, we propose a handover mechanism based on Care-of Prefix Pool (CoPP) in VANET with Mobile Network (NEMO). The vehicle adopting our handover...
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...
The high mobility and variability of road traffic has hampered the design of efficient communication protocols and the deployment of new services in vehicular networks. Nevertheless, the newly-introduced notion of virtual mobile nodes (VMNs) has the potential to turn wireless ad hoc networks into more predictable environments, facing the significant challenges raised by the mobility of the (real)...
Vehicular Ad hoc Networks(VANETs) enable plenty of important applications for vehicles, such as accident prevention and traffic jam avoidance. However, VANETs can hardly provide reliable connectivity between vehicles, which makes data dissemination of the aforementioned applications extremely difficult. Compared with VANETs, 3GPP cellular networks(e.g., LTE), offer much more reliable connectivity...
Vehicles equipped with modems for cellular networks can be utilized to collect connectivity data while being on the road and to monitor the current network properties. If these data are grabbed from many vehicles and transferred to a central server, the data can be aggregated and allow a prediction of future network capabilities for other vehicles which we define as Connectivity Map. This makes different...
An ad hoc network is a decentralized network that consists of mobile nodes with wireless communication devices without the aid of access points. A Vehicular Ad-hoc NETwork (VANET) is one of the representative applications of the ad hoc network. Epidemic routing has been proposed as a routing protocol based on Store-Carry-Forward mechanism for VANET environment. However, in epidemic routing, network...
One important issue for the management of mobile actors in a wireless sensor and actor network (WSAN) deployed in a safety-critical environment is to route and schedule the mobile actors in an energy-efficient way to timely respond to the events captured by sensors. This problem can be modeled as a multiple traveling salesman problem with time deadlines. In this paper, a variable neighborhood search...
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