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Mitigating the Impact of Mobility on H.264 Real-Time Video Streams Using Multiple Paths
Calafate, Carlos T.,Malumbres, Manuel P.,Manzoni, Pietro The Korea Institute of Information and Commucation 2004 Journal of communications and networks Vol.6 No.4
One of the main problems associated with MANETs is that mobility and the associated route discovery and maintenance procedures of reactive routing protocols cause severe interruptions on real-time video streams. Some of these interruptions are too large to be concealed using any sort of video technology, resulting in communications breaks unpleasant for the final end user. We present a solution for enhanced video transmission that increases route stability by using an improved route discovery process based on the DSR routing protocol, along with traffic splitting algorithms and a preventive route discovery mechanism. We also present some video adaptative mechanisms that improve the overall performance of multipath routing in terms of video data replication and video packet splitting strategies. Combining our proposals, we achieve up to 97% less interruptions on communication with high mobility and over 1.2 dB of improvements in terms of video distortion.
Towards a centralized route planning solution supporting time dependencies
Carlos t. Calafate,David Soler,Juan-Carlos Cano,Pietro Manzoni 한국산업정보학회 2014 한국산업정보학회 학술대회논문집 Vol.2014 No.1
Future route planning solutions are expected to provide significant Improvements in terms of route traversal times by accounting for both estimated and real-time traffic congestion states. Compared to current solutions, mostly based on static path segment costs, the main challenge is how to obtain reliable traffic congestion estimations for all the streets/avenues in a city for the different times of the day, for every day in a year. Modeling such a tremendous amount of data can be time-consuming and, additionally, centralized computation of optimal routes based on such time-dependencies has very high computational requirements. As a first approach to this problem, we propose a heuristic to reduce the modeling effort to a minimum while maintaing the benefits of time-dependent traffic congestion modeling. The effectiveness of this heuristic is assessed for the city of Valencia, Spain.
RCDP: Raptor-Based Content Delivery Protocol for Unicast Communication in Wireless Networks for ITS
Baguena, Miguel,Toh, C.K.,Calafate, Carlos T.,Cano, Juan-Carlos,Manzoni, Pietro The Korea Institute of Information and Commucation 2013 Journal of communications and networks Vol.15 No.2
Recent advances in forward error correction (FEC) coding techniques were focused on addressing the challenges of multicast and broadcast delivery. However, FEC approaches can also be used for unicast content delivery in order to solve transmission control protocol issues found in wireless networks. In this paper, we exploit the error resilient properties of Raptor codes by proposing Raptor-based content delivery protocol (RCDP) - a novel solution for reliable and bidirectional unicast communication in lossy links that can improve content delivery in situations where the wireless network is the bottleneck. RCDP has been designed, validated, optimized, and its performance has been analyzed in terms of throughput and resource efficiency. Experimental results show that RCDP is a highly efficient solution for environments characterized by high delays and packet losses making it very suitable for intelligent transport system oriented applications since it achieves significant performance improvements when compared to traditional transport layer protocols.
Design and Validation of a Low-Power Network Node for Pervasive Applications
Juan-Carlos Cano,Carlos T. Calafate,Pietro Manzoni,Jose-Manuel Cano,Eva Gonzalez 보안공학연구지원센터 2008 International Journal of Software Engineering and Vol.2 No.1
Pervasive computing refers to making many computing devices available throughout the physical environment, while making them effectively invisible to the user. To further increase 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-theshelf components. It allows every object to be augmented with processing and communication capabilities in order to make them "smart". We validate our proposal by evaluating the tradeoff between power consumption and performance for our experimental prototype. Our prototype has been used in a museum application to support ubiquitous computing between devices without requiring a priori knowledge of each other.
UbiqBIOPARC: A Wireless and Sensor Based Context-Aware System for an Enhanced Guide Experience
Sorribes, Jose-Vicente,Cano, Juan-Carlos,Calafate, Carlos T.,Manzoni, Pietro Korea Multimedia Society 2014 The journal of multimedia information system Vol.1 No.1
This work discusses and evaluates the use of wireless and multi-sensor based technologies to develop UbiqBIOPARC, a new generation zoological park that has been created based on the zoo-immersion concept. It offers appropriate contextual information to zoo visitors, depending on their preferences and the environment in which they are positioned. It combines the flexibility of the iPhone SDK, the connectivity provided by 3G technologies, the location capabilities of GPS, and the orientation offered by a digital compass integrated in the device. In this document the overall architecture and the implementation steps followed to create this context-aware application are presented. We compare our system with respect to previous ones and demonstrate that UbiqBIOPARC is an example of how innovative context-aware applications can be built with the aid of GPS and compass features. Several real experiments have been carried out in order to evaluate performance and system behavior, and numerical results demonstrate the practicality offered by our application, while providing a quite reasonable performance in terms of delay, usability, and energy efficiency.
DrivingStyles: A Mobile Platform for Driving Styles and Fuel Consumption Characterization
Javier E. Meseguer,Chai Keong Toh,Carlos T. Calafate,Juan-Carlos Cano,Pietro Manzoni 한국통신학회 2017 Journal of communications and networks Vol.19 No.2
Intelligent transportation systems (ITS) rely on connectedvehicle applications to address real-world problems. Researchis currently being conducted to support safety, mobility andenvironmental applications. This paper presents the DrivingStylesarchitecture, which adopts data mining techniques and neural networksto analyze and generate a classification of driving styles andfuel consumption based on driver characterization. In particular,we have implemented an algorithm that is able to characterize thedegree of aggressiveness of each driver. We have also developed amethodology to calculate, in real-time, the consumption and environmentalimpact of spark ignition and diesel vehicles from a set ofvariables obtained from the vehicle’s electronic control unit (ECU). In this paper, we demonstrate the impact of the driving style onfuel consumption, as well as its correlation with the greenhouse gasemissions generated by each vehicle. Overall, our platform is ableto assist drivers in correcting their bad driving habits, while offeringhelpful tips to improve fuel economy and driving safety.
Broadcast Message Dissemination Schemes for Urban Environments : a Survey
Julio A. Sanguesa,Manuel Fogue,Piedad Garrido,Francisco J. Martinez,Juan-Carlos Cano,Carlos T. Calafate 한국산업정보학회 2014 한국산업정보학회 학술대회논문집 Vol.2014 No.1
In VANKT traffic safety applications, efficient warning message dissemination is required. The main goal is to reduce the latency while ensuring the correct reception of warning information by nearby vehicles when a dangerous situation occurs. So far, several dissemination schemes have been proposed and evaluated under different conditions, and using different simulators, making it difficult to determine which is the optimal dissemination scheme. In this paper, we assess the performance of several existing broadcast dissemination schemes by evaluating them under the same conditions, and focusing on the same metrics, thus providing researchers with a general overview of the drawbacks and benefits associated to each scheme.