On the Experimental Evaluation of Vehicular Networks: Issues, Requirements and Methodology Applied to a Real Use Case

One of the most challenging fields in vehicular communications has been the experimental assessment of protocols and novel technologies. Researchers usually tend to simulate vehicular scenarios and/or partially validate new contributions in the area by using constrained testbeds and carrying out minor tests. In this line, the present work reviews the issues that pioneers in the area of vehicular communications and, in general, in telematics, have to deal with if they want to perform a good evaluation campaign by real testing. The key needs for a good experimental evaluation is the use of proper software tools for gathering testing data, post-processing and generating relevant figures of merit and, finally, properly showing the most important results. For this reason, a key contribution of this paper is the presentation of an evaluation environment called AnaVANET, which covers the previous needs. By using this tool and presenting a reference case of study, a generic testing methodology is described and applied. This way, the usage of the IPv6 protocol over a vehicle-to-vehicle routing protocol, and supporting IETF-based network mobility, is tested at the same time the main features of the AnaVANET system are presented. This work contributes in laying the foundations for a proper experimental evaluation of vehicular networks and will be useful for many researchers in the area.Comment: in EAI Endorsed Transactions on Industrial Networks and Intelligent Systems, 201

Location-aware service discovery on IPv6 GeoNetworking for VANET

Conference is technically co-sponsored by IEEE Communications Society and co-organized by the Technical Sub-Committee on Vehicular Networks and Telematics (VNAT)International audienceService discovery is an essential component for applications in vehicular communication systems. While there have been numerous service discovery protocols dedicated to a local network, mobile ad-hoc networks and the Internet, in vehicular communication systems, applications pose additional requirements; They need to discover services according to geo- graphical position. In this paper, we propose a location-aware service discovery mechanism for Vehicular Ad-hoc NETwork (VANET). The proposed mechanism exploits IPv6 multicast on top of IPv6 GeoNetworking specified by the GeoNet project. Thanks to the GeoBroadcast mechanism, it efficiently propagates service discovery messages to a subset of nodes inside a relevant geographical area with encapsulating IPv6 multicast packets. We implemented the mechanism using CarGeo6, an open source implementation of IPv6 GeoNetworking. Our real field evaluation shows the system can discover services with low latency and low bandwidth usage in VANETs

AnaVANET: an experiment and visualization tool for vehicular networks

International audienceThe experimental evaluation of wireless and mobile networks is a challenge that rarely substitutes simulation in research works. This statement is even more evident in vehicular communications, due to the equipment and effort needed to obtain significant and realistic results. In this paper, key issues in vehicular experimental evaluation are analyzed by an evaluation tool called AnaVANET, especially designed for assessing the performance of vehicular networks. This software processes the output of well-known testing tools such as ping or iperf, together with navigation information, to generate geo-aware performance figures of merit both in numeric and graphical forms. Its main analysis capabilities are used to validate the good performance in terms of delay, packet delivery ratio and throughput of NEMO, when using a road-side segment based on IPv6 GeoNetworking

Experimental Study on Channel Congestion using IEEE 802.11p Communication System

International audienceVehicle to Vehicle (V2V) and Vehicle to Infrastructure (V2I) communications are expected to play an important role to improve road safety, road efficiency, and the comfort of road users. In order to support such ITS communications, IEEE standardized 802.11p amendment, which is adopted by ETSI as ITSG5 for European usages. While much expectation has been put in using the system for V2V road safety and efficiency applications, very limited knowledge is achieved regarding its characteristics especially scalability. Motivated by this, we conduct experimental study using IEEE 802.11p communication devices with GeoNetworking (Geographic addressing and routing) and investigate its channel performances affected by number of devices, packet size and traffic rate

Fast Modular Arithmetic on the Kalray MPPA-256 Processor for an Energy-Efficient Implementation of ECM

International audienceThe Kalray MPPA-256 processor is based on a recent low-energy manycore architecture. In this article, we investigate its performance in multiprecision arithmetic for number-theoretic applications. We have developed a library for modular arithmetic that takes full advantage of the particularities of this architecture. This is in turn used in an implementation of the ECM, an algorithm for integer factorization using elliptic curves. For parameters corresponding to a cryptanalytic context, our implementation compares well to state-of-the-art implementations on GPU, while using much less energy

Location-aware service discovery on IPv6 GeoNetworking for VANET

Conference is technically co-sponsored by IEEE Communications Society and co-organized by the Technical Sub-Committee on Vehicular Networks and Telematics (VNAT)International audienceService discovery is an essential component for applications in vehicular communication systems. While there have been numerous service discovery protocols dedicated to a local network, mobile ad-hoc networks and the Internet, in vehicular communication systems, applications pose additional requirements; They need to discover services according to geo- graphical position. In this paper, we propose a location-aware service discovery mechanism for Vehicular Ad-hoc NETwork (VANET). The proposed mechanism exploits IPv6 multicast on top of IPv6 GeoNetworking specified by the GeoNet project. Thanks to the GeoBroadcast mechanism, it efficiently propagates service discovery messages to a subset of nodes inside a relevant geographical area with encapsulating IPv6 multicast packets. We implemented the mechanism using CarGeo6, an open source implementation of IPv6 GeoNetworking. Our real field evaluation shows the system can discover services with low latency and low bandwidth usage in VANETs

C³: A Scalable Networked Virtual Reality System

When a networked virtual reality system handles composite media audio and video as well as three dimensional computer graphics, the quality of the virtual space is also greatly affected by the currently available network and end system resources. In this paper, we discuss the architecture of a networked virtual reality system C 3 . We propose a new criterion called IoP(Importance of presence) for the quality control of virtual spaces. We have implemented our prototype system of C 3 on a QoS enabled network which can preserve a certain amount of resources. C 3 can adjust the quality of virtual space according to the available resources. Keywords Virtual environment, VRML, Quality control, Importance of presence(IoP) 1. Introduction People on computer networks can share virtual spaces easily by exchanging their descriptions of virtual spaces, which are described in Virtual Reality Modeling Language (VRML)[2]. We call this kind of application as a networked virtual reality (NVR) s..

Proposal of information retrieval method based on TPO metadata

PACRIM 2005: IEEE Pacific Rim Conference on Communications, Computers and signal Processing, Aug 24-26, 2005, Victoria, BC, CanadaTo search the contents through WWW in consideration of user's circumstance condition, search engines should make use of some information such as current time, user's location, user's schedule and so on. We propose an information retrieval method that effectively uses both user's and content's metadata based on TPO (time, position, occasion). We implement a prototype of information retrieval system based on the proposed method, which consists of query generation part, contents matching part, and matched results scoring part. In our query generation part, we reduce user's overload of choosing metadata. And a user becomes possible to retry sorting the matching results