2,749 research outputs found
Formal Modeling and Verification of GALS Systems Using GRL and CADP
The GALS (Globally Asynchronous, Locally Synchronous) paradigm is a prevalent approach to design distributed synchronous subsystems that communicate with each other asynchronously. The design of GALS systems is tedious and error-prone due to the complexity of architectures and high synchronous and asynchronous concurrency involved. This paper proposes a model-based approach to formally verify such systems. Specifications are written in GRL (GALS Representation Language), dedicated to model GALS systems with homogeneous syntax and formal semantics. We present a translation from GRL to LNT, a value-passing process algebra with imperative flavour. The translation is automated by means of the GRL2LNT tool, making possible the analysis of GRL specifications using the CADP toolbox. We illustrate our approach with an access management system for smart parking based on distributed software systems embedded in programmable logic controllers
Formal Modeling and Verification of GALS Systems Using GRL and CADP
The GALS (Globally Asynchronous, Locally Synchronous) paradigm is a prevalent approach to design distributed synchronous subsystems that communicate with each other asynchronously. The design of GALS systems is tedious and error-prone due to the complexity of architectures and high synchronous and asynchronous concurrency involved. This paper proposes a model-based approach to formally verify such systems. Specifications are written in GRL (GALS Representation Language), dedicated to model GALS systems with homogeneous syntax and formal semantics. We present a translation from GRL to LNT, a value-passing process algebra with imperative flavour. The translation is automated by means of the GRL2LNT tool, making possible the analysis of GRL specifications using the CADP toolbox. We illustrate our approach with an access management system for smart parking based on distributed software systems embedded in programmable logic controllers
Demonstrating Immersive Media Delivery on 5G Broadcast and Multicast Testing Networks
This work presents eight demonstrators and one showcase developed within the
5G-Xcast project. They experimentally demonstrate and validate key technical
enablers for the future of media delivery, associated with multicast and
broadcast communication capabilities in 5th Generation (5G). In 5G-Xcast, three
existing testbeds: IRT in Munich (Germany), 5GIC in Surrey (UK), and TUAS in
Turku (Finland), have been developed into 5G broadcast and multicast testing
networks, which enables us to demonstrate our vision of a converged 5G
infrastructure with fixed and mobile accesses and terrestrial broadcast,
delivering immersive audio-visual media content. Built upon the improved
testing networks, the demonstrators and showcase developed in 5G-Xcast show the
impact of the technology developed in the project. Our demonstrations
predominantly cover use cases belonging to two verticals: Media & Entertainment
and Public Warning, which are future 5G scenarios relevant to multicast and
broadcast delivery. In this paper, we present the development of these
demonstrators, the showcase, and the testbeds. We also provide key findings
from the experiments and demonstrations, which not only validate the technical
solutions developed in the project, but also illustrate the potential technical
impact of these solutions for broadcasters, content providers, operators, and
other industries interested in the future immersive media delivery.Comment: 16 pages, 22 figures, IEEE Trans. Broadcastin
Eighth Workshop and Tutorial on Practical Use of Coloured Petri Nets and the CPN Tools, Aarhus, Denmark, October 22-24, 2007
This booklet contains the proceedings of the Eighth Workshop on Practical Use of Coloured Petri Nets and the CPN Tools, October 22-24, 2007. The workshop is organised by the CPN group at the Department of Computer Science, University of Aarhus, Denmark. The papers are also available in electronic form via the web pages: http://www.daimi.au.dk/CPnets/workshop0
Joint Use of On-board Reconfigurable Antenna Pattern and Adaptive Coding and Modulation in Satellite Communications at High Frequency Bands
The Telecommunication market is driven by the increasing need of the end users for multimedia services which require high data rates. Within the fixed satellite service, frequency bandwidths wide enough to carry such high data rates are to be found in Ka band (26-40 GHz), and Q/V bands (40-50 GHz). However, at Ka band and above, transmitted signals can be severely affected by tropospheric attenuation for substantial percentages of time, resulting in the degradation of the quality and of the availability of communication services. Fade Mitigation Techniques (FMTs) must be used to counteract these severe propagation impairments. In this thesis we explore the joint use of two of the most promising techniques, known as Reconfigurable Antenna and Adaptive Coding and Modulation, which up to now has been separately developed. Some of our accomplishments include, but are not limited to: a methodology to describe rain attenuation conditions for multiple users in large geographical areas, a tractable framework for the generation of correlated time series of rain attenuation for multiple receiving stations, the comparison of performance between fixed antenna systems and Reconfigurable Antenna system coupled with Adaptive Coding and Modulation
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