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Mobile Ad Hoc Networks (MANETs) have been an important research topic for the last years, playing a crucial role within the fast growing sector of mobile communications. At the same time, video applications over mobile devices are becoming widely used by nowadays mobile clients, where the quality in the transmission of such contents will determine the success of these applications in the future. Therefore,...
Nowadays, due to the ubiquity of wireless technologies, users demand continuous connectivity guaranteeing the Quality of Service (QoS) required for their communications. To fulfill those requirements, seamless Vertical Handover (VHO) is performed in order to maintain the connectivity among different wireless technologies while the user equipment moves across different coverage areas. In this work,...
Emerging multimedia applications over mobile devices are becoming very popular, especially over infrastructure wireless networks such as cellular and WLANs. However, providing this kind of services over infrastructure-less networks like ad hoc networks presents many additional problems. One of these problems is how to share resources fairly among the users involved. In this article we propose a QoS...
The IEEE 802.11e technology is receiving much interest due to the enhancements offered to wireless local area networks in terms of QoS. Other application fields for this technology are wireless ad-hoc networks, wireless mesh networks and vehicular ad-hoc networks. In the literature, most of the research works available focusing on the IEEE 802.11e technology offer simulation results alone, being hard...
In this paper, we present a performance evaluation study analyzing the behavior of a generic warning message dissemination (WMD) mechanism in a 802.11p based VANET. In our WMD method, warning-mode vehicles notify nearby vehicles in order to improve traffic safety and to control traffic congestion. Our evaluation uses 2k factorial methodology to determine the most representative factors that affect...
Eavesdropping is an important threat in the context of mobile ad-hoc networks due to the use of open air as the transmission medium. As a consequence, some works trying to prevent this threat have been proposed. Some of these proposals focus on the use of anonymous routing protocols. In this paper we analyze two of the most popular: ANODR and MASK. We evaluate their performance through simulation...
Concept maps have been around for quite some time, and their principles are deeply rooted on well-known learning theories. When used in the evaluation process as a tool to assess learning they have obvious benefits by allowing students to externalize their own mental trees of assimilated concepts seamlessly. However, the assessment of concept maps includes a strong degree of subjectiveness, which...
The era of communication technology has now a great impact in our daily lives. Learning approaches are now evolving from traditional slide-based lectures into much more dynamic ones, where technology plays a key role in order to improve the studentspsila academic performance and engagement. In this paper, we propose a novel approach to develop interactive classroom environments supported by mobile...
Mobile ad hoc networks have a highly dynamic topology due to terminal mobility. Ad hoc routing protocols can cope with this mobility as they search for an alternative route when a currently-in-use path breaks. Despite of their ability to recover from path failures, the time elapsed until the route is reestablished deteriorates network performance. MANET routing protocols can detect link breakages...
Concept maps have been around for quite some time, and their principles are deeply rooted on well-known learning theories. When used in the evaluation process as a tool to assess learning it has obvious benefits since it allows students to externalize their own mental trees of assimilated concepts seamlessly. However, the evaluation process of concept maps includes a strong degree of subjectiveness,...
Deploying and testing vehicular ad hoc networks (VANETs) involves high cost and intensive labor. Hence simulation is a useful alternative prior to actual implementation. Most works found in the literature employ very simplistic radio propagation models (RPMs), ignoring the dramatic effects presented by buildings on radio signals. In this paper, we present three different RPMs that increase the level...
In this paper we present BlueFriend, a novel application for mobile devices that takes advantage of Bluetooth functionalities to create mobile social networks. Our application runs on PDAs and smart phones equipped with a Bluetooth adapter. BlueFriend periodically scans the environment in search of other members of the BlueFriend community; when found, ldquovirtual personal cardsrdquo (VPCs) are exchanged...
The validation of new video protocols and applications for mobile ad hoc networks in a real environment is an important task. In this work we present Castadiva, a test-bed architecture that allows validating software solutions for ad hoc networks using low-cost, off-the-shelf devices and open source software. We use this tool to test a videocall using the OLSR protocol in different scenarios, varying...
Research into the nature of pervasive computing has now been around for more than a decade. Nowadays pervasive applications exploit mobile wireless communication technologies to interconnect computing devices along with various sensing technologies, setting up a new kind of intelligent environment where applications can transparently search and use services without userspsila intervention. However,...
Ad hoc networking is regarded as an adequate solution to cooperative driving between communicating cars on the road. Deploying and testing these networks, usually known as Vehicular Ad-hoc Networks (VANETs), involves a high cost in the real world, and so simulation is an useful alternative in research. One of the most critical issues in a simulation study of VANETs is the use of a mobility model which...
Increasing the applicability of ubiquitous computing, minimizing energy consumption and hardware cost are mandatory in real world applications. In this paper we present our platform prototype for ubiquitous computing, which has been implemented based on commercial Bluetooth off-the-shelf components. It allows every object to be augmented with processing and communication capabilities in order to make...
To further increase the applicability of Bluetooth in real applications, reducing the energy consumption and hardware cost are important research topics. In this paper we examine the trade-off between power consumption and performance for our experimental prototype, which has been implemented based on commercial Bluetooth off-the-shelf components. Performance analysis shows that the use of the sniff...
Evaluating and deploying all sorts of protocols and applications designed for wireless ad hoc networks in a real environment is an important and urgent task. Traditionally, all the proposals made rely solely on simulator results. However, as different research groups develop different solutions to solve problems related to these new networks, it becomes more and more important to migrate the proposed...
The availability of both Wi-Fi and Bluetooth technologies on currently available devices offers the possibility to combine both in order to make the most out of their capabilities. In this paper we propose using Bluetooth technology to solve the configuration problem of the terminals conforming an IEEE 802.11-based ad-hoc network. The main objective of mobile ad- hoc networks (MANETs) is to extend...
IETF MANET (mobile ad hoc network) working group has standardized AODV (ad hoc on-demand distance vector) and OLSR (optimized link state routing) as its reactive and proactive routing protocols, respectively. In addition, from the transport layer's perspective, TCP (transmission control protocol) is still needed for MANET since it is widely used in the current Internet and suitable for smooth integration...
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