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90th IEEE Vehicular Technology Conference (IEEE VTC-Fall)

作者： Tomoskozi, Mate Lucani, Daniel Fitzek, Frank H. P. ekler, peter Tech Univ Dresden Commun Networks Grp Dresden Germany Aarhus Univ Dept Engn Commun Syst Aarhus Denmark Budapest Univ Technol & Econ Dept Automat & Appl Informat Budapest Hungary

ISBN: (纸本)9781728112206

The upcoming wireless network generation has put a large emphasis on the fulfilment of high reliability constraints. Nonetheless, the trade-off between these and other network aspects, mainly delay and bandwidth, is a constant optimisational question and a tough challenge. The various employed protocols add certain encapsulation overheads, which albeit necessary, however could potentially be excessive, such as in the case of various IoT, and similar applications with small payloads. Header compression aims to reduce these headers, but a general problem still plagues the standards since their introduction to loss-prone wireless networks, which is the issue of lost context (re)initialisation packets that can make the compression upstart and the transmission of major changes unreliable, slow and costly. In this paper we propose a solution that circumvents some concerns of traditional header compression context initialisation by the employment of network coding, which we call the reliable base proposal technique. This provides a finely tunable method for balancing reliability and delay of decompression with bandwidth gain. Our results show that both compression gain and reliability can be increased over the previous standards.

关键词： Robust Header Compression Compression Context Network Coding RoHCv2 Latency Reliability

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An analysis on the revoking mechanisms for JSON Web Tokens

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INTERNATIONAL JOURNAL OF DISTRIBUTED SENSOR NETWORKS 2018年第9期19卷 1-10页

作者： Janoky, Laszlo Viktor Levendovszky, Janos ekler, peter Budapest Univ Technol & Econ Dept Automat & Appl Informat Magyar Tudosok Krt 2 H-1117 Budapest Hungary Budapest Univ Technol & Econ Dept Telecommun & Media Informat Budapest Hungary

JSON Web Tokens provide a scalable solution with significant performance benefits for user access control in decentralized, large-scale distributed systems. Such examples would entail cloud-based, micro-services styled systems or typical Internet of Things solutions. One of the obstacles still preventing the wide-spread use of JSON Web Token-based access control is the problem of invalidating the issued tokens upon clients leaving the system. Token invalidation presently takes a considerable processing overhead or a drastically increased architectural complexity. Solving this problem without losing the main benefits of JSON Web Tokens still remains an open challenge which will be addressed in the article. We are going to propose some solutions to implement low-complexity token revocations and compare their characteristics in different environments with the traditional solutions. The proposed solutions have the benefit of preserving the advantages of JSON Web Tokens, while also adhering to stronger security constraints and possessing a finely tuneable performance cost.

关键词： JSON Web Tokens security access control distributed systems

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ICT IN ROAD VEHICLES - The VehicleICT Platform

ICT IN ROAD VEHICLES - The <i>VehicleICT</i> Platform

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International Conference on Models and Technologies for Intelligent Transportation Systems (MT-ITS)

作者： Lengyel, Laszlo ekler, peter Ujj, Tamas Balogh, Tamas Charaf, Hassan Szalay, Zsolt Jereb, Laszlo Budapest Univ Technol & Econ Magyar Tudosok Krt 2 H-1117 Budapest Hungary

ISBN: (纸本)9789633131428

Vehicles are not just a means of transportation anymore, but they are also moving entities that collect and transmit a great amount of local data, captured by sensors from the internals of the vehicle and from its environment as well. The consumers of this information include the passengers, especially the driver, and the environment, i.e. other vehicles, intelligent gates, centralized storage systems and data processing solutions. In order to maximize the value provided to the passengers, other vehicles and also the urban society, vehicle services utilize the local nature of the data. This paper discusses the VehicleICT platform, which is a proof of concept implementation, developed by a research institute and an automotive industrial partner.

关键词： vehicle ICT ICT in road vehicle ICT platform for road vehicles ODB-II CAN bus mobile big data management

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On the Performance Boost for Peer To Peer WebRTC-based Video Streaming with Network Coding

On the Performance Boost for Peer To Peer WebRTC-based Video...

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IEEE International Conference on Communications (ICC) / Wireless Communications Symposium / 3rd Workshop on Optical Wireless Communications (OWC)

作者： Braun, Patrik J. Sipos, Marton ekler, peter Fitzek, Frank H. P. Budapest Univ Technol & Econ Dept Automat & Appl Informat Budapest Hungary Tech Univ Dresden Deutsch Telekom Chair Commun Networks Dresden Germany

ISBN: (纸本)9781467389990

Video on Demand (VoD) streaming makes up an increasing portion of global IP traffic. Traditionally, data is served by content providers directly, putting a huge network load on the servers. We propose using our WebRTC-based protocols WebPeer and CodedWebPeer to create a P2P-assisted VoD streaming system with network coding. We introduce two metrics: network health to measure overall data saturation and network stability to show if the peers in the network are able to serve each other without the help of the server. We have implemented a testbed to emulate real-life network scenarios that includes a probabilistic model of peer behavior. We show through measurements that by applying network coding, network health is increased by up to 100% without changing the cache size or number of peers. Furthermore, network stability is achieved using up to half the cache compared to the uncoded approach, without increasing the servers load. Finally, to validate the scalability of our solution, we tested our protocols in a network with more than 100 tablets to deliver smooth video playback.

关键词： Protocols Servers Peer-to-peer computing Measurement Software Streaming media Network coding

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Evaluating the Performance of a Novel JWT Revocation Strategy

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ACTA CYBERNETICA 2021年第2期25卷 307-318页

作者： Janoky, Laszlo Viktor ekler, peter Levendovszky, Janos Budapest Univ Technol & Econ Dept Automat & Appl Informat Budapest Hungary Budapest Univ Technol & Econ Dept Networked Syst & Serv Budapest Hungary

JSON Web Tokens (JWT) provide a scalable, distributed way of user access control for modern web-based systems. The main advantage of the scheme is that the tokens are valid by themselves - through the use of digital signing - also imply its greatest weakness. Once issued, there is no trivial way to revoke a JWT token. In our work, we present a novel approach for this revocation problem, overcoming some of the problems of currently used solutions. To compare our solution to the established solutions, we also introduce the mathematical framework of comparison, which we ultimately test using real-world measurements.

关键词： JWT JSON Web Tokens user access control

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ICT IN ROAD VEHICLES - Reliable vehicle sensor information from OBD versus CAN

ICT IN ROAD VEHICLES - Reliable vehicle sensor information f...

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International Conference on Models and Technologies for Intelligent Transportation Systems (MT-ITS)

作者： Szalay, Zsolt Kanya, Zoltan Lengyel, Laszlo ekler, peter Ujj, Tamas Balogh, Tamas Charaf, Hassan Budapest Univ Technol & Econ 6 Stoczek Str Bld J Room 505 H-1111 Budapest Hungary Inventure Automot Elect R&D Budapest Hungary

ISBN: (纸本)9789633131428

The focus of the research and development activities in Intelligent Transportation Systems is to increase road traffic safety and improve transport efficiency. Telematics Systems can provide values on both fields, by providing real-time reliable vehicle specific information [1]. Road vehicle related information can be categorized into several types, but technical information provided through the electronic network of today's vehicles is becoming an increasingly important segment. Using the standard on-board diagnostics (OBD) is a popular solution nowadays for getting out technical data from the vehicle, but it has its limitations [2]. Professional systems rather use direct access to the vehicles CAN network to extract more detailed technical data out from the ECU communication [3]. Even automatic vehicle location (AVL) service providers have difficulties in differentiating between the possibilities and potentials of CAN bus and OBD. This article clearly identifies the differences between the solutions available on the market, by means of comparing the FMS CAN standard, the OBD standard and the Proprietary Vehicle CAN protocol. The comparison is not only theoretical, but it is based on different measurements and analysis. The measurement results demonstrate the benefits and limitations of these information sources. For the measurement we have used our VehicleICT [4] framework that provided the platform for storing and analyzing the data. Based on the provided comparison, the identified advantages and disadvantages of certain source types, we can select the proper solution for a specific requirement. One objective of this research activity is to clarify confusions about the relation of OBD and CAN from the Telematics Systems providers point of view. Besides that this research can be also considered as a pioneer work that demonstrates the capabilities of our VehicleICT framework.

关键词： CAN bus Fleet Management FMS standard ICT in road vehicles ITS OBD Proprietary Vehicle CAN Smart Transportation Telematics Vehicle diagnostics

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Wireless Applications of Mobile Egomotion Estimation with Computer Vision

Wireless Applications of Mobile Egomotion Estimation with Co...

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Proceedings of European Wireless 2015;21th European Wireless Conference

作者： Laszlo Kundra peter ekler Hassan Charaf

In this paper a summary of our orientation estimation algorithm is introduced with a focus on application areas on mobiles and in wireless environments. The standard problem of using gyroscopes for orientation estimation is that integration of raw angular rates with non-zero bias will lead to continuous drift of the result angle. To examine the nature of this bias, a simple error model was constructed for the whole device in terms of inertial sensing. For eliminating the bias, a sensor fusion algorithm was developed using the benefits of optical flow from the camera of the device. Our orientation estimator and bias removal method is based on complementary filters, in combination with an adaptive reliability filter for the optical flow features. The feedback of the fused result is combined with the raw gyroscope angular rates to compensate the bias. Various measurements were recorded on a real device running the demanding optical flow onboard. Our results are tested and reliable, and are able to enhance different application from the field of physics-education to current robust unmanned vehicles.

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BitTorrent at Mobile Phones

BitTorrent at Mobile Phones

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Consumer Communications and Networking Conference, CCNC IEEE

作者： peter ekler Imre Kelenyi Hassan Charaf Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Hungary

BitTorrent is one of the most efficient peer-to-peer content sharing protocols. The authors took part in implementing SymTorrent: a full featured BitTorrent client application for high-end mobile phones based on Symbian OS. Recently, they have also brought the BitTorrent technology to low-end mobile by creating a prototype application, called MobTorrent. Currently MobTorrent supports only content downloading (implementation of upload functionality is ongoing). The target platform of MobTorrent is the S40 platform, which is based on the Java Micro Edition technology. This paper contains a brief overview of the BitTorrent protocol, introduces the applications and outlines the demonstration.

关键词： Mobile handsets Peer to peer computing Java Automation Informatics Prototypes Access protocols Paper technology Current measurement Velocity measurement

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Analyzing Content Life Cycle in Mobile Content Sharing Environment

Analyzing Content Life Cycle in Mobile Content Sharing Envir...

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IEEE Eastern European Conference on the Engineering of Computer Based Systems, ECBS-EERC

作者： Kristof Csorba peter ekler Imre Kelenyi Department of Automation and Applied Informatics Budapest University of Technology and Economics Budapest Hungary

In this paper we analyze the lifecycle of content shared via the BitTorrent network by focusing on torrents retrieved by mobile phone clients using the MobTorrent application. MobTorrent is a full-feature BitTorrent client for feature phones. It has a profiling mechanism which was used to collect anonymous usage statistics over the last two years. Based on these statistics, we analyze how mobile BitTorrent clients are being used. We also investigate the successfulness of single client sessions by performing additional measurements of peer connection success ratios and download statistics. This research can be considered as a pioneer work in the field of mobile content sharing solutions, as MobTorrent is one of the first and most popular BitTorrent client for features phones.

关键词： Mobile handsets Peer to peer computing Mobile communication Histograms Java Multimedia communication Educational institutions

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Comparing OBD and CAN Sampling on the go with the SensorHUB Framework

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Procedia Engineering 2016年 168卷 39-42页

作者： David Sik Tamas Balogh peter ekler Laszlo Lengyel Budapest University of Technology and Economics Magyar tudósok körútja 2. Budapest 1111 Hungary AutSoft Ltd. Neumann János u. 1. Infopark A épület Budapest 1117 Hungary

In this paper we present our VehicleICT platform, which we use for comparing the OBD-II and CAN bus data from vehicles. VehicleICT platform is based on the SensorHUB framework. We present a novel measurement tool called ObdCanCompare that collects vehicle sensor data and shows them on our smartphone. Meanwhile the data gets aggregated, processed and loaded into a Hadoop-based data store. There we can develop business intelligence reports, various charts and dashboards. Using the measurements our goal is to decide which interface will be used for our connected car-based application called Social Driving.

关键词： Sensor OBD CAN ICT Vehicle BI Big Data

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