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Mourikas, George. "Reconfigurable software communication architecture : design implementation." Thesis, Lancaster University, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531709.
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Dackenberg, Jens. "Software Communication Architecture - Waveform Distribution with MHAL." Thesis, Linköping University, Communication Systems, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-58747.
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For a long time radio devices have been constructed in hardware with a fixed functionality. This way of constructing radio devices is starting to change with the concept of Software Defined Radio (SDR) evolving. The SDR concept leads to more flexible and long lasting radio devices. In order to make the radio software more standardized and portable, the U.S. military has defined the Software Communication Architecture (SCA). Internal communication within the SCA is done by CORBA, which limit waveforms to be only distributed over CORBA-capable hardware. The U.S. military has defined the Modem Hardware Abstraction Layer(MHAL) to enable distribution over devices not supporting CORBA. This thesis presents an implementation of MHAL and an underlying transport mechanism based on Ethernet. The implementation is done for the OSSIE package. The implementation is evaluated both in terms of real-time and throughput performance. The results show that MHAL achieves good performance, in comparison to CORBA, and can greatly be used to distribute waveforms over both CORBA and non-CORBA capable devices.
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Nicolaou, Cosmos Andrea. "A distributed architecture for multimedia communication systems." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385935.
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Shafabakhsh, Benyamin. "Research on Interprocess Communication in Microservices Architecture." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277940.
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With the substantial growth of cloud computing over the past decade, microservices has gained significant popularity in the industry as a new architectural pattern. It promises a cloud-native architecture that breaks large applications into a collection of small, independent, and distributed packages. Since microservices-based applications are distributed, one of the key challenges when designing an application is the choice of mechanism by which services communicate with each other. There are several approaches for implementing Interprocess communication (IPC) in microservices, and each comes with different advantages and trade-offs. While theoretical and informal comparison exists between them, this thesis has taken an experimental approach to compare and contrast common forms of IPC communications. In this the- sis, IPC methods have been categorized into Synchronous and Asynchronous categories. The Synchronous type consists of REST API and Google gRPC, while the Asynchronous type is using a message broker known as RabbitMQ. Further, a collection of microservices for an e-commerce scenario has been designed and developed using all the three IPC methods. A load test has been executed against each model to obtain quantitative data related to Performance Efficiency, and Availability of every method. Developing the same set of functionalities using different IPC methods has offered a qualitative data related to Scalability, and Complexity of each IPC model. The evaluation of the experiment indicates that, although there is no universal IPC solution that can be applied in all cases, Asynchronous IPC patterns shall be the preferred option when designing the system. Nevertheless, the findings of this work also suggest there exist scenarios where Synchronous patterns can be more suitable.Med den kraftiga tillväxten av molntjänster under det senaste decenniet har mikrotjänster fått en betydande popularitet i branschen som ett nytt arkitektoniskt mönster. Det erbjuder en moln-baserad arkitektur som delar stora applikationer i en samling små, oberoende och distribuerade paket. Eftersom microservicebaserade applikationer distribueras och körs på olika maskiner, är en av de viktigaste utmaningarna när man utformar en applikation valet av mekanism med vilken tjänster kommunicerar med varandra. Det finns flera metoder för att implementera Interprocess-kommunikation (IPC) i mikrotjänster och var och en har olika fördelar och nackdelar. Medan det finns teoretisk och in- formell jämförelse mellan dem, har denna avhandling tagit ett experimentellt synsätt för att jämföra och kontrastera vanliga former av IPC-kommunikation. I denna avhandling har IPC-metoder kategoriserats i synkrona och asynkrona kategorier. Den synkrona typen består av REST API och Google gRPC, medan asynkron typ använder en meddelandemäklare känd som RabbitMQ. Dessutom har en samling mikroservice för ett e-handelsscenario utformats och utvecklats med alla de tre olika IPC-metoderna. Ett lasttest har utförts mot var- je modell för att erhålla kvantitativa data relaterade till prestandaeffektivitet, och tillgänglighet för varje metod. Att utveckla samma uppsättning funktionaliteter med olika IPC-metoder har erbjudit en kvalitativ data relaterad till skalbarhet och komplexitet för varje IPC-modell. Utvärderingen av experimentet indikerar att även om det inte finns någon universell IPC-lösning som kan tillämpas i alla fall, ska asynkrona IPC-mönster vara det föredragna alternativet vid utformningen av systemet. Ändå tyder resultaten från detta arbete också på att det finns scenarier där synkrona mönster är mer lämpliga.
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Upson, Christopher S. "Design and implementation of a software communication architecture for the Janus-3D visualizer." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA288509.
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Loup, Adam. "A Software Framework for Augmentative and Alternative Communication." ScholarWorks@UNO, 2012. http://scholarworks.uno.edu/td/1461.
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By combining context awareness and analytical based relevance computing software, the proposed Augmentative and Alternative Communication (AAC) framework aims provide a foundation to create communication systems to dramatically increase the words available to AAC users. The framework will allow the lexicon available to the user to be dynamically updated by varying sources and to promote words based on contextual relevance. This level of customization enables the development of highly customizable AAC devices that evolve with use to become more personal while also broadening the expressiveness of the user. In order to maximize the efficient creation of conversation for AAC users, the framework provides a lexicon with the ability to obtain words from multiple sources which are then organized according to relevance in a situational context.
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Kriegler, Wouter. "A fixed-point DSP architecture for software-defined radio." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/3029.
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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2009.Due to ever evolving wireless communication standards and technologies, the need for more flexible radio terminals are becoming more sought after in order to adapt to these new standards. Software-defined radio offers a solution to this demand. Software-defined radio is a radio communication system where signal processing components that have typically been implemented in hardware are replaced by reconfigurable and re-useable software modules running on a digital processor. The need exists to rapidly create new SDR applications without designing an entire system from the ground up, and without specialised knowledge of the target platform. This thesis initially describes the design of a generic SDR architecture that is highly reconfigurable and promotes a high level of code re-use. The research forms part of a larger project to design a domain-specific language (DSL) in which to describe SDR functionality in a platform-independent way. In this thesis, the code synthesis from the DSL is extended to support the Freescale DSP563xx family.
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Balister, Philip John. "A Software Defined Radio Implemented using the OSSIE Core Framework Deployed on a TI OMAP Processor." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/36272.
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Software Defined Radios are computer based systems that emulate the behavior of traditional radio systems by processing digitized radio signals. A SDR replaces the traditional fixed hardware radio with a system that may be reconfigured, both during operation to provide greater flexibility and by providing software upgrades to add new capabilities without requiring new hardware. These are powerful reasons for using SDR technology; however this flexibility comes at the cost of increased hardware cost and greater power consumption compared with traditional hardware radios.
This report presents measurements of memory and processor usage for a Software Communication Architecture (SCA) waveform running on an OMAP starter kit and a desktop PC. The process used to build software, originally targeted for a desktop computer, on an embedded machine with a different processor architecture is described. OSSIE, an open source SCA implementation developed at Virginia Tech, was ported to the ARM processor by adding support for building OSSIE into the OpenEmbedded build system. Once the port for the OMAP starter kit was complete, it became possible to easily re-target OSSIE for a variety of other hardware platforms.
For testing purposes a simple waveform capable of transmitting several common digital modulation formats was developed. A SCA device for the Universal Software Radio Peripheral was developed to interface the waveform to the antenna.
One method to reduce the cost and power consumption is to limit the amount of memory used in the radio. This reduces both cost and power consumption. This report describes the memory manager portion of the Linux kernel and how it helps reduce the memory used by the system. The exmap tool for accurately measuring memory usage is described and used to measure the memory usage of the OSSIE based test waveform. These techniques help radio developers measure and reduce the amount of memory required for the SDR, reducing system cost and power consumption.
Finally, the oprofile was used to measure relative processor usage of the waveform components. Oprofile can also provide details about specific sections of waveform code that use the most processor cycles. This information helps the radio designer reduce the number of processing cycles required. This allows the hardware to use a lower speed part, or add more capability to the radio design.Master of Science
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Pintar, Freddie. "Investigation and Implementation of a Live Connection between Configura CET and Revit Architecture 2009." Thesis, Linköping University, PELAB - Programming Environment Laboratory, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-17357.
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Building Information Modeling -BIM- is an innovative method to seamlessly bridgecommunication within the architecture, engineering and construction industries.With BIM software you can exchange information during the design, construction,and maintaining. BIM can be seen as a continuation of the CAD software, wherethe users exchanged information by word of mouth, now is made automatically.To get the effect required for BIM one or more CAD-systems have to work togetherto exchange information. Revit Architecture is an application by Autodeskwhere BIM is used from the design and construction to the documentation andmaintaining of a building. Configura is one of the major software developers of interiorsolutions and want to integrate their software with Revit Architecture. Theconcept of objects in both software system suit well to be used in BIM and witha live connection these could be shared between the applications. One of the conclusionsin this investigation was that the only way to have integration betweenthe applications was to use the API provided by Autodesk. And therefore theimplementation is limited to the function in it. Revit API is a powerful programmingenvironment that let 3rd party software extend the functionality in Revit.The results show how Remote Procedure Call as a communication tool can beused to exchange data between the applications, how different type of data can berepresented in both applications, and why we cannot have a live synchronization.
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Bizhuta, Ermal, and Dhespina Carhoshi. "Applicability Study of Software Architectures in the Discrete Manufacturing Domain." Thesis, Mälardalens högskola, Inbyggda system, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-44705.
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Manufacturing, under the umbrella of the latest industrial revolution, has gone through enormous changes in the last decades to then later evolve in what we know now as smart manufacturing. Different companies and entities have developed their own versions of architectures for intelligentand digitalized manufacturing systems. Ideating a exible and safe architecture is one of the first steps towards a system that intends to be applicable in different environments, regardless of the vast variety of possibilities available. For this purpose, the following thesis presents an investigation on the state-of-the-art solutions of the most recent digitalized cloud-based system architectures in the domain of discreet manufacturing. Based on an initial system architecture conceived from the company ABB, an evaluation of this architecture was conducted, by taking in consideration the existing systematical approaches to the digitalization of this industry. In the following thesis work, we investigate, describe and evaluate the limitations and strengths of the most recent and known architectural approaches to cloud robotics. Finally, a few key remarks are made towards ABB's initial solution but also to the industry in general.PADME
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Atencio, Luis, Bruno Aybar, and Padilla Alfredo Barrientos. "Comparative analysis of cross-platform communication mechanisms." Association for Computing Machinery, 2018. http://hdl.handle.net/10757/624690.
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El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado.The present research aims to compare the different technologies that allow real-time communication between Android and iOS devices. We conducted a measurement-driven experiment to test the performance of each technology under different scenarios. We determine their functionality according to the environment for which they have been developed, showing competent information about their capabilities based on the communication channel they use, and their performance measured in milliseconds. The final results allow mobile application developers to determine which technologies suits them the best, based on the specific context of their projects.
Revisión por pares
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Radovic, Zoran. "Software Techniques for Distributed Shared Memory." Doctoral thesis, Uppsala University, Department of Information Technology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6058.
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In large multiprocessors, the access to shared memory is often nonuniform, and may vary as much as ten times for some distributed shared-memory architectures (DSMs). This dissertation identifies another important nonuniform property of DSM systems: nonuniform communication architecture, NUCA. High-end hardware-coherent machines built from large nodes, or from chip multiprocessors, are typical NUCA systems, since they have a lower penalty for reading recently written data from a neighbor's cache than from a remote cache. This dissertation identifies node affinity as an important property for scalable general-purpose locks. Several software-based hierarchical lock implementations exploiting NUCAs are presented and evaluated. NUCA-aware locks are shown to be almost twice as efficient for contended critical sections compared to traditional lock implementations.
The shared-memory “illusion”' provided by some large DSM systems may be implemented using either hardware, software or a combination thereof. A software-based implementation can enable cheap cluster hardware to be used, but typically suffers from poor and unpredictable performance characteristics.
This dissertation advocates a new software-hardware trade-off design point based on a new combination of techniques. The two low-level techniques, fine-grain deterministic coherence and synchronous protocol execution, as well as profile-guided protocol flexibility, are evaluated in isolation as well as in a combined setting using all-software implementations. Finally, a minimum of hardware trap support is suggested to further improve the performance of coherence protocols across cluster nodes. It is shown that all these techniques combined could result in a fairly stable performance on par with hardware-based coherence.
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España, Cubillo Sergio. "METHODOLOGICAL INTEGRATION OF COMMUNICATION ANALYSIS INTO A MODEL-DRIVEN SOFTWARE DEVELOPMENT FRAMEWORK." Doctoral thesis, Universitat Politècnica de València, 2012. http://hdl.handle.net/10251/14572.
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It is widely recognised that information and communication technologies development is a risky activity. Despite the advances in software engineering, many software development projects fail to satisfy the clients' needs, to deliver on time or to stay within budget. Among the various factors that are considered to cause failure, an inadequate requirements practice stands out. Model-driven development is a relatively recent paradigm with the potential to solve some of the dragging problems of software development. Models play a paramount role in model-driven development: several modelling layers allow defining views of the system under construction at different abstraction levels, and model transformations facilitate the transition from one layer to the other. However, how to effectively integrate requirements engineering within model-driven development is still an open research challenge. This thesis integrates Communication Analysis, a communication-oriented business process modelling and requirements engineering method for information systems development, and the OO Method, an object-oriented model-driven software development method provides automatic software generation from conceptual models. We first provide a detailed specification of Communication Analysis intended to facilitate the integration; among other improvements to the method, we build an ontology-based set of concept definitions in which to ground the method, we provide precise methodological guidelines, we create a metamodel for the modelling languages included in the method, and we provide tools to support the creation of Communication Analysis requirements models. Then we perform the integration by providing a technique to systematically derive OO-Method conceptual models from Communication Analysis requirements models. The derivation technique is offered in two flavours: a set of rules to be manually applied by a human analyst, and an ATL model transformation that automates this task.España Cubillo, S. (2011). METHODOLOGICAL INTEGRATION OF COMMUNICATION ANALYSIS INTO A MODEL-DRIVEN SOFTWARE DEVELOPMENT FRAMEWORK [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/14572
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Samalenge, Jimmy. "Developing SOA wrappers for communication purposes in rural areas." Thesis, University of Fort Hare, 2010. http://hdl.handle.net/10353/320.
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The introduction of Web Services as a platform upon which applications can communicate has contributed a great deal towards the expansion of World Wide Web technologies. The Internet and computing technologies have been some of the factors that have contributed to the socio-economic improvement of urban and industrial areas. This research focuses on the application of Service-Oriented Architecture (SOA) and Web Services technologies in Information and Communication Technologies for Development (ICT4D) contexts. SOA is a style used to design distributed systems, and Web Services are some of the common realizations of the SOA. Web Services allow the exchange of data between two or more machines in a simple and standardized manner over the network. This has resulted in the augmentation of ways in which individuals in a society and in the world communicate. This research aims to develop a SOA-based system with services that are implemented as Web Services. The system is intended to support communication activities of Dwesa community members. The communication methods identified as the most commonly used in the Dwesa community are Short Message Services (SMSs) and voice calls. In this research we have identified further methods (i.e. Multimedia Message Service, Electronic mail and Instant Messaging) to augment communication activities in Dwesa. The developed system, therefore, exposes SMS Web Service, MMS Web Service, Email Web Service and IM Web Service that are consumed in machine-to-machine, machine-to-person and person-to-person types of communication. We have also implemented a one-stop communication shop, through a web portal which provides interfaces to the different communication modules. Elaborate functional and usability testing have also been undertaken to establish the viability and end-user acceptance of the system respectively. This research has provided the initial validation of the effectiveness of the SOA-based system in ICT4D contexts
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Zamouril, Jakub. "Flight Software Development for Demise Observation Capsule." Thesis, Luleå tekniska universitet, Rymdteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-64420.
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This work describes the process of the design of a flight software for a space-qualified device, outlines the development and testing of the SW, and provides a description of the final product. The flight software described in this work has been developed for the project Demise Observation Capsule (DOC). DOC is a device planned to be attached to an upper stage of a launch vehicle and observe its demise during atmospheric re-entry at the end of its mission. Due to constraint on communication time during the mission and the need to maximize the amount of transferred data, a custom communication protocol has been developed.Demise Observation Capsule
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Grand, Michaël. "Conception d’un crypto-système reconfigurable pour la radio logicielle sécurisée." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14388/document.
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Les travaux de recherche détaillés dans ce document portent sur la conception et l’implantation d’un composant matériel jouant le rôle du sous-système cryptographique d’une radio logicielle sécurisée.A partir du début des années 90, les systèmes radios ont peu à peu évolué de la radio classique vers la radio logicielle. Le développement de la radio logicielle a permis l’intégration d’un nombre toujours plus grand de standards de communication sur une même plateforme matérielle. La réalisation concrète d’une radio logicielle sécurisée amène son concepteur à faire face à de nombreuses problématiques qui peuvent se résumer par la question suivante : Comment implanter un maximum de standards de communication sur une même plateforme matérielle et logicielle ? Ce document s’intéresse plus particulièrement à l’implantation des standards cryptographiques destinés à protéger les radiocommunications.Idéalement, la solution apportée à ce problème repose exclusivement sur l’utilisation de processeurs numériques. Cependant, les algorithmes cryptographiques nécessitent le plus souvent une puissance de calcul telle que leur implantation sous forme logicielle n’est pas envisageable. Il s’ensuit qu’une radio logicielle doit parfois intégrer des composants matériels dédiés dont l'utilisation entre en conflit avec la propriété de flexibilité propre aux radios logicielles.Or depuis quelques années, le développement de la technologie FPGA a changé la donne. En effet, les derniers FPGA embarquent un nombre de ressources logiques suffisant à l’implantation des fonctions numériques complexes utilisées par la radio logicielle. Plus précisément, la possibilité offerte par les FPGA d'être reconfiguré dans leur totalité (voir même partiellement pour les derniers d’entre eux) fait d’eux des candidats idéaux à l’implantation de composants matériels flexibles et évolutifs dans le temps. À la suite de ces constatations, des travaux de recherche ont été menés au sein de l’équipe Conception des Systèmes Numériques du Laboratoire IMS. Ces travaux ont d’abord débouché sur la publication d’une architecture de sous-système cryptographique pour la radio logicielle sécurisée telle qu’elle est définie par la Software Communication Architecture. Puis, ils se sont poursuivis par la conception et l’implantation d’un cryptoprocesseur multi-cœur dynamiquement reconfigurable sur FPGAThe research detailed in this document deal with the design and implementation of a hardware integrated circuit intended to be used as a cryptographic sub-system in secure software defined radios.Since the early 90’s, radio systems have gradually evolved from traditional radio to software defined radio. Improvement of the software defined radio has enabled the integration of an increasing number of communication standards on a single radio device. The designer of a software defined radio faces many problems that can be summarized by the following question: How to implement a maximum of communication standards into a single radio device? Specifically, this work focuses on the implementation of cryptographic standards aimed to protect radio communications.Ideally, the solution to this problem is based exclusively on the use of digital processors. However, cryptographic algorithms usually require a large amount of computing power which makes their software implementation inefficient. Therefore, a secure software defined radio needs to incorporate dedicated hardware even if this usage is conflicting with the property of flexibility specific to software defined radios.Yet, in recent years, the improvement of FPGA circuits has changed the deal. Indeed, the latest FPGAs embed a number of logic gates which is sufficient to meet the needs of the complex digital functions used by software defined radios. The possibility offered by FPGAs to be reconfigured in their entirety (or even partially for the last of them) makes them ideal candidates for implementation of hardware components which have to be flexible and scalable over time.Following these observations, research was conducted within the Conception des Systèmes Numériques team of the IMS laboratory. These works led first to the publication of an architecture of cryptographic subsystem compliant with the security supplement of the Software Communication Architecture. Then, they continued with the design and implementation of a partially reconfigurable multi-core cryptoprocessor intended to be used in the latest FPGAs
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Matougui, Selma. "Proposition d'un processus de réification d'abstraction de communication comme un connecteur associé à des générateurs." Phd thesis, Université Rennes 1, 2005. http://tel.archives-ouvertes.fr/tel-00012036.
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Les approches de conception et de programmation à base de composants et les architectures logicielles séparent les composants de leurs interconnexions. Ces dernières, souvent appelées connecteurs, possèdent des définitions diverses et contradictoires dans la communauté. Le but de cette thèse est de clarifier le concept de connecteur et de proposer un processus pour son implémentation sous la forme d'un ensemble de générateurs. Ainsi, nous définissons un connecteur comme un élément d'architecture qui évolue et se concrétise durant son cycle de vie. Nous discutons en détails les différents concepts relatifs à ce cycle de vie, et nous les illustrons au travers de la mise en œuvre et l'évaluation d'un connecteur d'équilibrage de charge. Pour finir, nous dressons une classification entre les deux types d'abstraction de communication : les connecteurs et les composants de communication. Ainsi, nous mettons en avant les différences et les principaux critères de choix entre ces deux entités.
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Johansson, Gustav. "Investigating differences in response time and error rate between a monolithic and a microservice based architecture." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264840.
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With great advancements in cloud computing, the microservice architecture has become a promising architectural style for enterprise software. It has been proposed to cope with problems of the traditional monolithic architecture which includes slow release cycles, limited scalability and low developer productivity. Therefore, this thesis aims to investigate the affordances and challenges of adopting microservices as well as the difference in performance compared to the monolithic approach at one of Sweden’s largest banks, SEB - the Scandinavian Individual Bank. The investigation consisted of a literature study of research papers and official documentation of microservices. Moreover, two applications were developed and deployed using two different system architectures - a monolithic architecture and a microservice architecture. Performance tests were executed on both systems to gather quantitative data for analysis. The two metrics investigated in this study were response time and error rate. The results indicate the microservice architecture has a significantly higher error rate but a slower response time than the monolithic approach, further strengthening the results of Ueda et. al. [47] and Villamizar et. al. [48]. The findings have then been discussed with regards to the challenges and complexity involved in implementing distributed systems. From this study, it becomes clear the complexity shifts from inside the application out towards infrastructure with a microservice architecture. Therefore, microservices should not be seen as a silver bullet. Rather, the type of architecture is highly dependent on the scope of the project and the size of the organization.Med stora framstegen inom molntjänster har microservice arkitekturen kommit att bli en lämplig kandidat för utveckling av företagsprogramvara. Denna typ av systemarkitektur har föreslagits att lösa de problem som den traditionella monolitiska arkitekturen medför; långsamma lanseringar, begränsad skalbarhet och låg produktivitet. Således fokuserar denna avhandling på att utforska de möjligheter samt utmaningar som följer vid adoptering av microservices samt skillnaden i prestanda jämfört med den monolitiska arkitekturen. Detta undersöktes på en av Sveriges största banker, SEB, den Skandinaviska Enskilda Banken. Utredningen bestod av en litteraturstudie av vetenskapliga artiklar samt officiell dokumentation för microservices. Dessutom utvecklades och lanserades två applikationer byggt med två olika typer av systemarkitektur - en som monolitisk arkitektur och den andra som en microservice arkitektur. Prestandatest utfördes sedan på båda systemen för att samla kvantitativ data för analys. De två nyckelvardena som undersöktes i denna studie var responstid och felfrekvens. Resultaten indikerar att microservice arkitekturen har en signifikant högre felfrekvens men en långsammare responstid än den monolitiska arkitekturen, vilket stärker resultaten av Ueda et. al. [47] och Villamizar et. al. [48]. Forskningsresultaten har diskuterats med hänsyn till den komplexitet och de utmaningar som följer vid implementering av distribuerade system. Från denna studie blir det tydligt att komplexiteten i en microservice arkitektur skiftar från inuti applikationen ut till infrastrukturen. Således borde microservices inte ses som en silverkula. Istället är valet av systemarkitektur strikt beroende på omfattningen av projektet samt storleken på organisationen i fråga.
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Faradj, Rasti. "The run-time impact of business functionality when decomposing and adopting the microservice architecture." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-235800.
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In line with the growth of software, code bases are getting bigger and more complex. As a result of this, the architectural patterns, which systems rely upon, are becoming increasingly important. Recently, decomposed architectural styles have become a popular choice. This thesis explores system behavior with respect to decomposing system granularity and external communication between the resulting decomposed services. An e-commerce scenario was modeled and implemented at different granularity levels to measure the response time. In establishing the communication, both REST with HTTP and JSON and the gRPC framework were utilized. The results showed that decomposition has impact on run-time behaviour and external communication. The highest granularity level implemented with gRPC for communication establishment adds 10ms. In the context of how the web behaves today, it can be interpreted as feasible but there is no discussion yet on whether it is theoretically desirable.I linje med de växande mjukvarusystemen blir kodbaserna större och mer komplexa. Arkitekturerna som systemen bygger på får allt större betydelse. Detta examensarbete utforskar hur upplösning av system som tillämpar mikroservicearkitektur beter sig, och hur de påverkas av kommunikationsupprättande bland de upplösta och resulterande tjänsterna. Ett e-handelsscenario modelleras i olika granularitetsnivåer där REST med HTTP och JSON samt gRPC används för att upprätta kommunikationen. Resultaten visar att upplösningen påverkar runtimebeteendet och den externa kommunikationen blir långsammare. En möjlig slutsats är att påverkan från den externa kommunikationen i förhållande till hur webben beter sig idag är acceptabel. Men om man ska ligga inom teoretiskt optimala gränser kan påverkan ses som för stor.
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Gohar, Adnan. "Analyzing Service Oriented Architecture (SOA) in Open Source Products." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-10770.
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Service Oriented Architecture (SOA) is an architectural paradigm that allows building of infrastructures for diverse application interaction and integration via services across different platforms, domains of technology and locations. SOA differs from traditional architectures, as it focuses on integrating capabilities that are distributed and implemented using a mixture of technologies. SOA provides a set of methodologies and strategies to accomplish interoperability and integration among different technology stacks. Vattenfall is the fifth the largest energy supplier within Europe. Having operational systems in different countries brings the challenge of integrating all these distributed systems and this integration is a vital requirement for Vattenfall. The company is currently using Microsoft proprietary products to achieve integration across different technological platform, but requires a better integration infrastructure which is easily extensible and cost effective. This thesis investigates the impact of implementing Service Oriented Architecture (SOA) using open source or proprietary software products within Vattenfall, from technological and financial perspectives. For this purpose, different technical and non-technical function blocks are identified which are essential for the implementation of SOA. These function blocks are mapped with SOA solutions provided by Red Hat’s JBoss Open Source SOA Platform and Microsoft’s SOA Platform. After mapping, a vendor specific technical and non-technical comparative analysis is carried out based on the function blocks, highlighting the strengths and weaknesses of each vendor. Finally, an evaluation scheme is purposed based on the technical comparative analysis of vendors, SOA solution cost and SOA competence required. The results from this evaluation scheme are used to recommend the best solution vendor for Vattenfall Nordic. Moreover, this evaluation scheme can also be used to facilitate management in arriving at an appropriate decision about implementation of SOA, while remaining within their requirements and constraints.
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Glaab, Markus. "A distributed service delivery platform for automotive environments : enhancing communication capabilities of an M2M service platform for automotive application." Thesis, University of Plymouth, 2018. http://hdl.handle.net/10026.1/11249.
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The automotive domain is changing. On the way to more convenient, safe, and efficient vehicles, the role of electronic controllers and particularly software has increased significantly for many years, and vehicles have become software-intensive systems. Furthermore, vehicles are connected to the Internet to enable Advanced Driver Assistance Systems and enhanced In-Vehicle Infotainment functionalities. This widens the automotive software and system landscape beyond the physical vehicle boundaries to presently include as well external backend servers in the cloud. Moreover, the connectivity facilitates new kinds of distributed functionalities, making the vehicle a part of an Intelligent Transportation System (ITS) and thus an important example for a future Internet of Things (IoT). Manufacturers, however, are confronted with the challenging task of integrating these ever-increasing range of functionalities with heterogeneous or even contradictory requirements into a homogenous overall system. This requires new software platforms and architectural approaches. In this regard, the connectivity to fixed side backend systems not only introduces additional challenges, but also enables new approaches for addressing them. The vehicle-to-backend approaches currently emerging are dominated by proprietary solutions, which is in clear contradiction to the requirements of ITS scenarios which call for interoperability within the broad scope of vehicles and manufacturers. Therefore, this research aims at the development and propagation of a new concept of a universal distributed Automotive Service Delivery Platform (ASDP), as enabler for future automotive functionalities, not limited to ITS applications. Since Machine-to-Machine communication (M2M) is considered as a primary building block for the IoT, emergent standards such as the oneM2M service platform are selected as the initial architectural hypothesis for the realisation of an ASDP. Accordingly, this project describes a oneM2M-based ASDP as a reference configuration of the oneM2M service platform for automotive environments. In the research, the general applicability of the oneM2M service platform for the proposed ASDP is shown. However, the research also identifies shortcomings of the current oneM2M platform with respect to the capabilities needed for efficient communication and data exchange policies. It is pointed out that, for example, distributed traffic efficiency or vehicle maintenance functionalities are not efficiently treated by the standard. This may also have negative privacy impacts. Following this analysis, this research proposes novel enhancements to the oneM2M service platform, such as application-data-dependent criteria for data exchange and policy aggregation. The feasibility and advancements of the newly proposed approach are evaluated by means of proof-of-concept implementation and experiments with selected automotive scenarios. The results show the benefits of the proposed enhancements for a oneM2M-based ASDP, without neglecting to indicate their advantages for other domains of the oneM2M landscape where they could be applied as well.
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Chen, Lunde. "Resource allocation in multi-domain wireless software-defined networks." Thesis, Toulouse, INSA, 2019. http://www.theses.fr/2019ISAT0002/document.
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La tendance à la numérisation de nombreux secteurs industriels tels que l’automobile, l’agriculture, les transports, la gestion urbaine, etc. révèle la nécessité de nouveaux usages des services de communication point-à-multipoint, tels que la fourniture massive de mises à jour logicielles et livraison fiable de messages d’alerte à la population, etc. D’un autre côté, la mise en logiciel des réseaux de nouvelle génération, avec notamment l’adoption croissante des réseaux définis par logiciel (SDN), apporte au réseau la flexibilité et les capacités de programmation permettant de prendre en charge des services de distribution point-à-multipoint de manière rentable. Cette thèse contribue au problème général de la fourniture de services de communication point-à-multipoint avec des exigences de qualité de service (QoS) dans un réseau SDN multi-domaines. Il considère également que certains des domaines sont des réseaux multi-sauts sans-fil. Tout d’abord, une technique d’agrégation de topologie de domaine basée sur une arborescence de Steiner, combinée à un algorithme heuristique d’allocation de ressources, sont proposés pour prendre en charge des services point-à-multipoint couvrant plusieurs domaines. Ensuite, un service de découverte de topologie générique est proposé pour les réseaux multi-sauts sans-fil basés sur le SDN afin de permettre au contrôleur SDN de créer et de gérer une vue complète du réseau avec divers attributs de nœud et de liaison sans-fil. Le contrôleur peut alors exposer des vues personnalisées aux applications de contrôle du réseau, telles que, par exemple, l’application en charge de la fourniture de services point-à-multipoint sur un réseau multi-sauts sans-fil basé sur le paradigme SDN. Un algorithme basé sur la programmation linéaire en nombres entiers et un algorithme génétique sont également proposés pour l’allocation de liens virtuels point-à-multipoint sur un réseau sans-fil multi-radio, multi-canaux et multi-sauts basé sur SDN. Enfin, pour traiter le cas des services dynamiques point-à-multipoint, nous proposons un schéma de réallocation de ressources qui répond aux exigences changeantes tout en réduisant les interuptions de serviceThe movement towards the digitalization of many industry sectors such as automotive, agriculture, transportation, city management, etc. is revealing the need for novel usages of point-to-multipoint network delivery services, such as massive delivery of software updates to objects, secure and reliable delivery of alert messages to population, etc. On another side, the softwarization of next generation networks, with amongst, the increasing adoption of Software Defined Networks (SDN) is bringing to the network the flexibility and programming capabilities that enable the support of point-to-multipoint delivery services in an efficient and cost-effective way. This PhD work contributes to the general problem of providing point-tomultipoint delivery services with Quality of Service (QoS) requirements in a multidomain SDN network. It also considers that some of the domains are wireless multi hop networks. First, a Steiner tree based network domain topology aggregation combined with a resource allocation heuristic algorithm is proposed to support point-to-multipoint delivery services that span multiple domains. Then, a generic topology discovery service is proposed for SDN based wireless multi-hop networks to let the SDN controller build and maintain a comprehensive view of the network with various node and wireless link attributes. From there, customized views can be exposed by the controller to network control applications, as, for instance, the application in charge of provisioning point-to-multipoint services on a SDN based wireless multi-hop network. An Integer linear programming based algorithm and a genetic algorithm are also proposed for the embedding of point-to-multipoint services on a SDN based multi-radio, multi-channel and multi-hop wireless network. Last, to address the case of dynamic point-to-multipoint services, we propose a resource reallocation scheme that meets the changing requirements while reducing service disruption
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Tournier, Jean-Charles. "Qinna : une architecture à base de composants pour la gestion de la qualité de service dans les systèmes embarqués mobiles." Phd thesis, INSA de Lyon, 2005. http://tel.archives-ouvertes.fr/tel-00009704.
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Les systèmes embarqués communicants sont de plus en plus présents dans notre environnement quotidien sous formes de PDA, téléphones portables, etc. Ces sytèmes se doivent d'être ouverts afin de pouvoir accueillir de nouvelles applications tout au long de leur cycle de vie. Ils possèdent alors des contraintes fortes de types qualité de service, sécurité, tolérance aux fautes, etc. La programmation à base de composants apparaît comme une solution prometteuse pour le développement de tels systèmes. Cependant, un des frein à l'adoption de ce type de programmation est que les modèles à composants n'intègrent pas les aspects de gestion de qualité de service. Ce travail de thèse présente une architecture de gestion de qualité de service pour les systèmes embarqués mobiles à composants. Cette architecture, appelée Qinna, est définie à l'aide de composants Fractal et permet la mise en œuvre, ainsi que la gestion dynamique, de contrats de qualité de service entre les différents composants d'un système. L'originalité de l'approche proposée permet de prendre en compte la qualité de service quelque soit le niveau considéré du système (niveau applicatif, niveau services, niveau système d'exploitation et niveau ressources).
L'architecture Qinna a été validée par une évaluation qualitative à base de patrons génériques d'architecture, puis par une évaluation quantitative permettant de montrer que le coût de l'architecture reste faible.
Le travail réalisé ouvre de nombreuses perspectives de recherche notamment celle de généraliser l'approche utilisée (définition d'une architecture abstraite de composant pour la prise en charge de la gestion d'une propriété non-fonctionnelle, ici la QdS) à d'autres propriétés non-fonctionnelles (par exemple la sécurité ou la tolérance aux fautes), et d'en tirer des conclusions sur la définition et la génération de conteneurs ouverts.
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Pelay, Johan. "Garantir la cohérence applicative lors des changements de configuration réseau : étude de cas sur la connectivité dans les Software Defined Infrastructures." Thesis, Rennes 1, 2020. http://www.theses.fr/2020REN1S001.
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Des solutions de vérification efficaces nous semblent indispensables afin d’assurer la continuité des services en place et le déploiement de nouveaux services dans les réseaux 5G. Cette problématique ne se limite pas aux techniques de vérification, nos travaux portent aussi sur la formalisation des besoins d'un service réseau complet. Nous avons travaillé sur un langage de programmation facilitant la vérification dans les contrôleurs SDN. Puis nous avons défini des contrats de comportement réseau afin de clarifier les propriétés à vérifier pour assurer le bon fonctionnement d'un service. Enfin nous avons étudié MANO pour proposer une extension du standard permettant de vérifier les configurations réseau au niveau de l'orchestrateurWe believe that effective verification solutions are essential to ensure the continuity of existing services and the deployment of new services in 5G networks. This problem is not limited to verification techniques, our work also concerns the formalization of needs of a complete network service. We worked on a programming language to facilitate verification in SDN controllers. Then we defined network behavior contracts to clarify the properties to be verified to ensure the proper functioning of a service. Finally, we studied MANO to propose an extension of the standard to check the network configurations at the orchestrator level
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Sayed, Shereef. "Black-Box Fuzzing of the REDHAWK Software Communications Architecture." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/54566.
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As the complexity of software increases, so does the complexity of software testing. This challenge is especially true for modern military communications as radio functionality becomes more digital than analog. The Software Communications Architecture was introduced to manage the increased complexity of software radios. But the challenge of testing software radios still remains. A common methodology of software testing is the unit test. However, unit testing of software assumes that the software under test can be decomposed into its fundamental units of work. The intention of such decomposition is to simplify the problem of identifying the set of test cases needed to demonstrate correct behavior. In practice, large software efforts can rarely be decomposed in simple and obvious ways. In this paper, we introduce the fuzzing methodology of software testing as it applies to software radios. Fuzzing is a methodology that acts only on the inputs of a system and iteratively generates new test cases in order to identify points of failure in the system under test. The REDHAWK implementation of the Software Communications Architecture is employed as the system under test by a fuzzing framework called Peach. Fuzz testing of REDHAWK identified a software bug within the Core Framework, along with a systemic flaw that leaves the system in an invalid state and open to malicious use. It is recommended that a form of Fault Detection be integrated into REDHAWK for collocated processes at a minimum, and distributed processes at best, in order to provide a more fault tolerant system.Master of Science
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Salber, Daniel. "De l'interaction homme-machine individuelle aux systèmes multi-utilisateurs : l'exemple de la communication homme-homme mediatisée." Grenoble 1, 1995. http://tel.archives-ouvertes.fr/tel-00005060.
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Cette thèse s'inscrit dans le domaine de l'ingénierie des systèmes multi-utilisateurs. Dans notre modèle conceptuel, un système multi-utilisateur repose sur la combinaison de trois espaces fonctionnels : l'espace de production, l'espace de coordination et l'espace de communication. Ce dernier espace, la communication entre individus, fait l'objet de notre étude et définit la communication homme-homme médiatisée. L'approche adoptée s'articule en trois niveaux : les principes, issus des sciences non-informatiques (psychologie, sociologie, éthique, etc. ), les propriétés issues des principes et destinées à guider la conception et évaluer la réalisation, et enfin les techniques de mise en oeuvre informatique. Les principes traduisent les contributions de sciences non-informatiques comme les sciences sociales ou la psychologie cognitive à notre domaine d'étude. L'expérimentation psychologique Garden Movie, qui étudie l'influence de la disposition des caméras et de la surface de travail dans une tâche collecticielle, illustre l'utilisation des principes. Les propriétés sont des caractéristiques objectives et vérifiables d'un système informatique dont le choix est guidé par les principes. Nous proposons des propriétés pour les systèmes multi-utilisateurs et les systèmes de communication homme-homme médiatisée. Les propriétés permettent de guider la conception ainsi que l'étude de l'utilisabilité d'un système. Nous présentons la plate-forme d'observation du comportement des utilisateurs et Magicien d'Oz NEIMO pour l'étude expérimentale de l'utilisabilité. Nous illustrons son utilisation pour les systèmes de communication homme-homme médiatisée avec l'expérience Supratel. Les techniques comprennent deux volets : les modèles d'architecture logicielle guident la réalisation et les outils permettent la réalisation effective. Le choix des techniques est guide par les propriétés que le système doit vérifier. Nous présentons une grille d'analyse des modèles d'architecture logicielle pour les systèmes multi-utilisateurs que nous utilisons pour évaluer les modèles proposés dans la littérature. Constatant qu'aucun n'intègre harmonieusement les trois espaces de notre modèle conceptuel et l'insuffisance des modèles pour la communication homme-homme médiatisée, nous présentons CoPAC, un modèle d'architecture logicielle pour les systèmes multi-utilisateurs et la communication médiatisée. Nous illustrons sa mise en oeuvre avec la réalisation de notre médiaspace VideoPort. En ce qui concerne les outils, nous décrivons la réalisation de la bibliothèque UserLink pour la communication de médias continus. Nous proposons aussi la taxonomie IMPACT pour l'analyse des outils de communication homme-homme médiatisée
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Bouassida, Rodriguez Ismael. "Dynamic software architecture management for collaborative communicating systems. Gestion dynamique des architectures logicielles pour les systèmes communicants collaboratifs." Phd thesis, INSA de Toulouse, 2011. http://tel.archives-ouvertes.fr/tel-00583926.
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Dans ce manuscrit, nous proposons de concevoir et de mettre en oeuvre un environnement logiciel pour une "gestion guidée par les modèles" des changements dans les architectures des applications distribuées coopératives. Les aspects adaptabilité des applications, les aspects transformations de graphe et les aspects particuliers des applications distribuées coopératives sont étudiés. Une approche d'adaptation s'appuyant sur une modélisation par les graphes et un style architectural de type Poducteur/Consommateur est présentée pour des applications communicantes collaboratives sensibles au contexte. Une démarche de raffinement est proposée permettant de garantir un certain degré d'adaptabilité en faisant un compromis entre les différents paramètres du contexte. Ces travaux de recherche ont aussi permis de définir un cadre algorithmique générique de reconfiguration architecturale multi-niveaux pour la sélection des architectures de déploiement les plus adaptées à un contexte et aux situations associées. Ce cadre a été appliqué au cas de la communication et de la coopération de groupe. Elle a aussi permis de modéliser le style architectural Producteur/Consommateur pour une communication orientée évènement. Des règles d'adaptation ont été définies. Elles comportent une partie basée sur SWRL pour la description du contexte et des règles d'adaptation, et une partie basée sur les grammaires de graphes pour la transformation des configurations de déploiement
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Taušan, N. (Nebojša). "Choreography modeling in embedded systems domain." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526214573.
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Abstract Choreography modelling, as a service-oriented architecture specific technique, is increasingly present in embedded systems development domain. This technique specifies a flow of interactions between participants' services from the global or neutral point of view while the specified models represent an integral part of the overall software architecture. Choreography modelling languages that are currently used in embedded systems domain, however, are not expressive enough to capture the choreography-relevant information in this domain. For this reason, choreography specifications are often lacking information or include ambiguous information. This allows misinterpretation of the specified choreography models and leads to difficulties in communication among stakeholders that use those models. The objective of this research is to advance the design of choreography modelling languages by identifying the information content that is relevant in embedded systems domain and by designing a choreography modelling language that supports that information content. To achieve this objective, this research adopted the design science research framework and five individual studies were conducted within this framework. These studies used methods such as the interviews with practitioners, company specific documents and open standards to understand the challenges in industry, systematic literature review to collect the existing scientific knowledge about the utilization of choreography in embedded systems and the focus groups to evaluate the designed language. Based on these study results, the information content that is relevant for choreography modelling in embedded systems domain was identified and then supported with the design of choreography modelling language. The design of the choreography modelling language is evaluated in academic and industry context. The evaluation in academic context is realized by language implementation while the evaluation in industry is realized with industry experts. Language evaluation showed increased expressiveness of the designed language and indicated on possible benefits from its use in testing and protocol development area. These benefits include the reduction of development time and errors in the testing phase while the reduction of maintenance burden and performance improvement can be expected in the protocol development areaTiivistelmä Koreografinen mallintaminen on enenevässä määrin käytetty tekniikka sulautettujen järjestelmien palvelukeskeisten arkkitehtuurien määrittelyssä. Tämän mallintamisen avulla pystytään määrittämään palveluiden ja osallistujien välisten vuorovaikutusten virtaa globaalilla tasolla kun taas määritellyt mallit kuvaavat ohjelmistoarkkitehtuurin keskeisiä osakokonaisuuksia. Tällä hetkellä sulautettujen järjestelmien koreografiseen mallintamiseen käytetyt kielet eivät ole tarpeeksi ilmaisuvoimaisia kattaakseen alalla tarvittavien mallien oleelliset tietosisällöt. Tästä syystä koreografiamalleista puuttuu usein oleellisia tietoja tai tietosisällöt eivät ole yksiselitteisiä. Tämä johtaa koreografiamallien tietosisältöjen virheelliseen tulkintaan, joka taas aiheuttaa haasteita malleja hyödyntävien sidosryhmien välisessä vuorovaikutuksessa. Tämän tutkimuksen tavoitteena on edistää koreografiamallinnuksessa käytettävien kielten suunnittelua tunnistamalla ne tietosisällöt, jotka ovat oleellisia sulautetuille järjestelmille sekä suunnitella kieli, joka tukee oleellisia tietosisältöjä. Tavoitteen saavuttamiseksi sovellettiin "design science" (suunnittelun tutkimus) tutkimusmenetelmää, jolla toteutettiin viisi tapaustutkimusta. Näissä tutkimuksissa hyödynnettiin teollisuuden asiantuntijoiden haastatteluita, yrityskohtaisia dokumentteja ja avoimia standardeja, joiden avulla pystyttiin ymmärtämään teollisuuden kohtaamia haasteita tutkimusalueella. Systemaattisen kirjallisuuskatsauksen avulla kerättiin yhteen olemassa oleva tieteellinen tietämys koreografian käytöstä sulautetuissa järjestelmissä. Kehitetyn kielen sopivuutta teolliseen tuotekehitykseen arvioitiin asiantuntiaryhmille järjestetyissä työpajoissa. Saatujen tutkimustulosten valossa koreografiamallinnuksessa tarvittavat oleelliset tietosisällöt sulautettujen järjestelmien alueella pystyttiin määrittämään sekä kehittämään tietosisältöä tukeva koreografian mallinnuskieli. Kehitetty mallinnuskieli on arvioitu akateemisessa kontekstissa toteuttamalla koreografian mallinnuskieli. Teollisessa ympäristössä arvioinnin ovat suorittaneet teollisuuden asiantuntijat. Arviointien tuloksena voidaan todeta, että kehitetyllä mallinnuskielellä on parempi ilmaisuvoima kuin aiemmin käytössä olleilla kielillä. Lisäksi saatiin viitteitä kielen soveltuvuudesta testauksessa ja protokollien kehityksessä. Kieltä soveltamalla saavutettiin lyhempi kehitysaika ja vähennettiin virheitä testausvaiheessa. Lisäksi protokollan kehityksen osuudessa oletetaan ylläpidon kuormittavuuden vähenevän ja suorituskyvyn paranevan
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Maheshwarappa, Mamatha R. "Software defined radio (SDR) architecture for concurrent multi-satellite communications." Thesis, University of Surrey, 2017. http://epubs.surrey.ac.uk/813388/.
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SDRs have emerged as a viable approach for space communications over the last decade by delivering low-cost hardware and flexible software solutions. The flexibility introduced by the SDR concept not only allows the realisation of concurrent multiple standards on one platform, but also promises to ease the implementation of one communication standard on differing SDR platforms by signal porting. This technology would facilitate implementing reconfigurable nodes for parallel satellite reception in Mobile/Deployable Ground Segments and Distributed Satellite Systems (DSS) for amateur radio/university satellite operations. This work outlines the recent advances in embedded technologies that can enable new communication architectures for concurrent multi-satellite or satellite-to-ground missions where multi-link challenges are associated. This research proposes a novel concept to run advanced parallelised SDR back-end technologies in a Commercial-Off-The-Shelf (COTS) embedded system that can support multi-signal processing for multi-satellite scenarios simultaneously. The initial SDR implementation could support only one receiver chain due to system saturation. However, the design was optimised to facilitate multiple signals within the limited resources available on an embedded system at any given time. This was achieved by providing a VHDL solution to the existing Python and C/C++ programming languages along with parallelisation so as to accelerate performance whilst maintaining the flexibility. The improvement in the performance was validated at every stage through profiling. Various cases of concurrent multiple signals with different standards such as frequency (with Doppler effect) and symbol rates were simulated in order to validate the novel architecture proposed in this research. Also, the architecture allows the system to be reconfigurable by providing the opportunity to change the communication standards in soft real-time. The chosen COTS solution provides a generic software methodology for both ground and space applications that will remain unaltered despite new evolutions in hardware, and supports concurrent multi-standard, multi-channel and multi-rate telemetry signals.
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Iyer, Srikrishna. "A Unifying Interface Abstraction for Accelerated Computing in Sensor Nodes." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/34625.
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Hardware-software co-design techniques are very suitable to develop the next generation of sensornet applications, which have high computational demands. By making use of a low power FPGA, the peak computational performance of a sensor node can be improved without significant degradation of the standby power dissipation. In this contribution, we present a methodology and tool to enable hardware/software co-design for sensor node application development. We present the integration of nesC, a sensornet programming language, with GEZEL, an easy-to-use hardware description language. We describe the hardware/software interface at different levels of abstraction: at the level of the design language, at the level of the co-simulator, and in the hardware implementation. We use a layered, uniform approach that is particularly suited to deal with the heterogeneous interfaces typically found on small embedded processors. We illustrate the strengths of our approach by means of a prototype application: the integration of a hardware-accelerated crypto-application in a nesC application.Master of Science
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Low, Kian Wai. "Software Communications Architecture (SCA) compliant software defined radio design for IEEE 802.16 wirelessman-OFDMtm transceiver." Thesis, Monterey, Calif. : Naval Postgraduate School, 2006. http://bosun.nps.edu/uhtbin/hyperion.exe/06Dec%5FLow.pdf.
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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, December 2006.Thesis Advisor(s): Frank Kragh. "December 2006." Includes bibliographical references (p. 71-72). Also available in print.
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Ramdat, Upendra. "Software Communications Architecture (SCA) compliant software radio design for Interim Standard 95B (IS-95B) transceiver." Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion.exe/07Mar%5FRamdat.pdf.
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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, March 2007.Thesis Advisor(s): Frank Kragh. "March 2007." Includes bibliographical references (p. 139-140). Also available in print.
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Grand, Michael. "Conception d'un crypto-système reconfigurable pour la radio logicielle sécurisée." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2011. http://tel.archives-ouvertes.fr/tel-00670151.
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Les travaux de recherche détaillés dans ce document portent sur la conception et l'implantation d'un composant matériel jouant le rôle du sous-système cryptographique d'une radio logicielle sécurisée. A partir du début des années 90, les systèmes radios ont peu à peu évolué de la radio classique vers la radio logicielle. Le développement de la radio logicielle a permis l'intégration d'un nombre toujours plus grand de standards de communication sur une même plateforme matérielle. La réalisation concrète d'une radio logicielle sécurisée amène son concepteur à faire face à de nombreuses problématiques qui peuvent se résumer par la question suivante : Comment implanter un maximum de standards de communication sur une même plateforme matérielle et logicielle ? Ce document s'intéresse plus particulièrement à l'implantation des standards cryptographiques destinés à protéger les radiocommunications. Idéalement, la solution apportée à ce problème repose exclusivement sur l'utilisation de processeurs numériques. Cependant, les algorithmes cryptographiques nécessitent le plus souvent une puissance de calcul telle que leur implantation sous forme logicielle n'est pas envisageable. Il s'ensuit qu'une radio logicielle doit parfois intégrer des composants matériels dédiés dont l'utilisation entre en conflit avec la propriété de flexibilité propre aux radios logicielles. Or depuis quelques années, le développement de la technologie FPGA a changé la donne. En effet, les derniers FPGA embarquent un nombre de ressources logiques suffisant à l'implantation des fonctions numériques complexes utilisées par la radio logicielle. Plus précisément, la possibilité offerte par les FPGA d'être reconfigurés dans leur totalité (voir même partiellement pour les derniers d'entre eux) fait d'eux des candidats idéaux à l'implantation de composants matériels flexibles et évolutifs dans le temps. À la suite de ces constatations, des travaux de recherche ont été menés au sein de l'équipe Conception des Systèmes Numériques du Laboratoire IMS. Ces travaux ont d'abord débouché sur la publication d'une architecture de sous-système cryptographique pour la radio logicielle sécurisée telle qu'elle est définie par la Software Communication Architecture. Puis, ils se sont poursuivis par la conception et l'implantation d'un cryptoprocesseur multicœur dynamiquement reconfigurable sur FPGA.
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Leong, Wai Kiat Chris. "Software defined radio design for an IEEE 802.11A transceiver using open source Software Communications Architecture (SCA) implementation." Thesis, Monterey California. Naval Postgraduate School, 2006. http://hdl.handle.net/10945/10084.
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Hegarty, Declan. "FPGA-based architectures for next generation communications networks." Thesis, University of Glasgow, 2008. http://theses.gla.ac.uk/455/.
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This engineering doctorate concerns the application of Field Programmable Gate Array (FPGA) technology to some of the challenges faced in the design of next generation communications networks. The growth and convergence of such networks has fuelled demand for higher bandwidth systems, and a requirement to support a diverse range of payloads across the network span. The research which follows focuses on the development of FPGA-based architectures for two important paradigms in contemporary networking - Forward Error Correction and Packet Classification. The work seeks to combine analysis of the underlying algorithms and mathematical techniques which drive these applications, with an informed approach to the design of efficient FPGA-based circuits.
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Guan, Tut San. "Programming model for a computer architecture base on free-space optical communications." Thesis, Queen Mary, University of London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244690.
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Knutsson, Björn. "Architectures for application transparent proxies : A study of network enhancing software." Doctoral thesis, Uppsala University, Department of Information Technology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-802.
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Proxies, software deployed inside the network, play a fundamental role in the Internet by providing enhanced functionality to the network. Deployment of proxies is a flexible way of extending the Internet architecture with new services and to cope with problems that were not foreseen at the time the original Internet protocols were defined. The creation of the Internet is an enormous investment in time, effort and money, and proxies allow us to build on the existing infrastructure to enhance its functionality, rather than replace it.
As the use of proxies increase, so does the problem of proxy configuration and deployment, especially with respect to interference between different proxies. With a limited number of different proxies, this problem can be dealt with manually, or by encoding knowledge of interfering proxies into each proxy. As the number of proxies grow, methods to automatically detect and cope with conflicts must be devised.
Therefore, proxies need to coordinate with each other. Towards this end, a signalling protocol that can be used to establish and configure a sequence of one or more proxies along an end-to-end flow is proposed. The protocol is realized as an extension of IP, using an IP option, which simplifies its deployment in the Internet.
In order to facilitate reasoning about coordination, conflicts and deployment of proxies, a model has been developed. The model is based on the concept of regions, also developed in the thesis. Regions are interconnected parts of the network that share a common property, e.g. administrative control or error characteristic. Along with the model, a classification of proxy architectures with respect to how they gather information and deploy proxies is presented. A method based on this model is also proposed.
We also propose an algorithm for controlling compression to maximize perceived throughput in situations where available bandwidth and CPU power varies. Along with the algorithm, experimental results that show that the algorithm approximates the best non-adaptive choice in a number of situations are presented. This algorithm has been implemented as an end-to-end enhancement.
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Sadat, Mohammad Nazmus. "QoE-Aware Video Communication in Emerging Network Architectures." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin162766498933367.
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Hitefield, Seth D. "A Defense-In-Depth Security Architecture for Software Defined Radio Systems." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/96594.
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Modern wireless communications systems are constantly evolving and growing more complex. Recently, there has been a shift towards software defined radios due to the flexibility soft- ware implementations provide. This enables an easier development process, longer product lifetimes, and better adaptability for congested environments than conventional hardware systems. However, this shift introduces new attack surfaces where vulnerable implementa- tions can be exploited to disrupt communications or gain unauthorized access to a system. Previous research concerning wireless security mainly focuses on vulnerabilities within pro- tocols rather than in the radios themselves. This dissertation specifically addresses this new threat against software radios and introduces a new security model intended to mitigate this threat. We also demonstrate example exploits of waveforms which can result in either a denial-of-service or a compromise of the system from a wireless attack vector. These example exploits target vulnerabilities such as overflows, unsanitized control inputs, and unexpected state changes.
We present a defense-in-depth security architecture for software radios that protects the system by isolating components within a waveform into different security zones. Exploits against vulnerabilities within blocks are contained by isolation zones which protects the rest of the system from compromise. This architecture is inspired by the concept of a microkernel and provides a minimal trusted computing base for developing secure radio systems. Unlike other previous security models, our model protects from exploits within the radio protocol stack itself and not just the higher layer application. Different isolation mechanisms such as containers or virtual machines can be used depending on the security risk imposed by a component and any security requirements. However, adding these isolation environments incurs a performance overhead for applications. We perform an analysis of multiple example waveforms to characterize the impact of isolation environments on the overall performance of an application and demonstrate the overhead generated from the added isolation can be minimal. Because of this, our defense-in-depth architecture should be applied to real-world, production systems. We finally present an example integration of the model within the GNU Radio framework that can be used to develop any waveform using the defense-in-depth se- curity architecture.Doctor of Philosophy
In recent years, wireless devices and communication systems have become a common part of everyday life. Mobile devices are constantly growing more complex and with the growth in mobile networks and the Internet of Things, an estimated 20 billion devices will be connected in the next few years. Because of this complexity, there has been a recent shift towards using software rather than hardware for the primary functionality of the system. Software enables an easier and faster development process, longer product lifetimes through over- the-air updates, and better adaptability for extremely congested environments. However, these complex software systems can be susceptible to attack through vulnerabilities in the radio interfaces that allow attackers to completely control a targeted device. Much of the existing wireless security research only focuses on vulnerabilities within different protocols rather than considering the possibility of vulnerabilities in the radios themselves. This work specifically focuses on this new threat and demonstrates example exploits of software radios. We then introduce a new security model intended to protect against these attacks. The main goal of this dissertation is to introduce a new defense-in-depth security architecture for software radios that protects the system by isolating components within a waveform into different security zones. Exploits against the system are contained within the zones and unable to compromise the overall system. Unlike other security models, our model protects from exploits within the radio protocol stack itself and not just the higher layer application. Different isolation mechanisms such as containers or virtual machines can be used depending on the security risk imposed by a component and any security requirements for the system. However, adding these isolation environments incurs a performance overhead for applications. We also perform a performance analysis with several example applications and show the overhead generated from the added isolation can be minimal. Therefore, the defense-in-depth model should be the standard method for architecting wireless communication systems. We finally present a GNU Radio based framework for developing waveforms using the defense- in-depth approach.
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Soulahakis, Alexander. "An architecture for mobile communications in hazardous situations and physical disasters." Thesis, Liverpool John Moores University, 2007. http://researchonline.ljmu.ac.uk/5885/.
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Hazardous environmental conditions have always been a threat to human lives around the globe. Human society has seen some of the worst disasters due to accidents, physical phenomena or even cases that humans have created on purpose. The existing infrastructure can guarantee that there are hospitals, markets, mass transportation networks, sophisticated communications networks, and many more to cover all possible needs from a home user to an enterprise company. Unfortunately, the infrastructure has been proven unstable due to rapid environmental changes. The sophisticated networks, as well as the support buildings, can become useless in seconds in the event of a physical phenomenon such as an earthquake, a fire or a flood or even worse in the event of a well organized terrorist attack. The major problems identified are associated with inadequate capacity of the network, equipment vulnerable to physical phenomena and methodologies of disaster recovery that require time and work force to be applied. Modem telecommunication systems are designed in a cost effective way, to support as many users as they can, by using minimum equipment, but they cannot support users in hazardous environments. As a response to this situation we present the development of a novel architecture, which is based on an fast deployed network, infrastructure independent. The proposed network is capable of providing mobile subscribers with messaging and voice services in hazardous environments at the time of the event. Similar studies are based on infrastructure as they are in the need of extra hardware deployment. The novelty of our research is that we combine 802.11 and GSM in order to form a fast deployed network, infrastructure independent. The proposed architecture has two modes of operation: messages only or voice system. This solution benefits from the advantages of a deployed, infrastructure independent Ad Hoc network. This network is able to recover quickly from errors and can survive in hazardous dynamic environments. In addition we benefit from GSM technology using already implemented functions such as encoding/decoding for voice transmission. Combining those two technologies we can deploy a network which satisfies the challenges previously mentioned. While 802.11 handles connectivity and data transfers, GSM is responsible for bit error correction of voice calls and a number of other functions such as messaging and identification. The proposed architecture has been designed and simulated in order to evaluate the network. The evaluation has been separated in two phases. Messaging and voice capabilities of the network have been tested to investigate their performance. In the evaluation we check the factors affecting the network in a hazardous environment and we compare it to other approaches and similar networks. The results prove that the concept of messaging service is valid as the system can operate in hazardous environments. Voice capabilities of the system have been proven to work but further work is needed for maximising the performance and the reliability of the network. The new architecture can form the basis for the next generation emergency telecommunication services.
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Martelli, Matteo. "Design and development of a software architecture for seamless vertical handover in mobile communications." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/12237/.
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In this work I firstly present an overview on current wireless
technology and network mobility focusing on
challenges and issues which arise when mobile nodes migrate among
different access networks, while employing real-time communications and
services. In literature many solutions propose different methods and
architectures to enhance vertical handover, the process of transferring a
network communication between two technologically different points of
attachment. After an extensive review of such solutions this document
describes my personal implementation of a fast vertical handover
mechanism for Android smartphones. I also performed a
reliability and performance comparison
between the current Android system and my enhanced architecture which have
both been tested in a
scenario where vertical handover was taking place between WiFi and cellular
network while the mobile node was using video streaming services.
Results show the approach of my implementation to be promising, encouraging
future works, some of which are suggested at the end of this dissertation
together with concluding remarks.
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Jann, Christian. "Koexistenz von AUTOSAR Softwarekomponenten und Linux-Programmen für zukünftige High Performance Automotive Steuergeräte." Master's thesis, Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-202576.
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Moderne Fahrerassistenzsysteme und der Weg zum autonomen Fahren stellen immer größere Anforderungen an die Steuergeräte Hard- und Software im Fahrzeug. Um diese Anforderungen zu erfüllen kommen vermehrt hochperformante Steuergeräte mit einer heterogenen Prozessorarchitektur zum Einsatz. Ein Safety-Prozessor, auf dem ein standardmäßiges AUTOSAR-Betriebssystem ausgeführt wird, übernimmt dabei die echtzeitkritischen und sicherheitsrelevanten Aufgaben wohingegen die rechenintensiven und dynamischen Aufgaben auf einem sehr viel leistungsfähigeren Performance-Prozessor unter einem POSIX-Betriebssystem wie zum Beispiel Linux ausgeführt werden. Hierbei soll es ermöglicht werden unter dem Linux System ebenfalls AUTOSAR Softwarekomponenten und Module auszuführen, welche beispielsweise die im Fahrzeug verwendeten Kommunikationsprotokolle umsetzen oder weniger sicherheitskritische Aufgaben erfüllen. Auf diese Weise lassen sich andere Steuergeräte im Fahrzeug entlasten. Dazu wurde im Rahmen dieser Arbeit eine Softwarearchitektur entwickelt, die es ermöglicht AUTOSAR-Komponenten direkt in einer Linux-Umgebung auszuführen. Des Weiteren wurde eine einfache und effiziente Kommunikation zwischen AUTOSARKomponenten und Linux-Applikationen erarbeitet.
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Qin, Xiaohan. "On the use and performance of communication primitives in software controlled cache-coherent cluster architectures /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/6925.
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Schmidt-Knorreck, Carina. "Architectures radio-logicielles appliquées aux réseaux véhiculaires." Thesis, Paris, ENST, 2012. http://www.theses.fr/2012ENST0057/document.
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Répondre aux contraintes des architectures reconfigurables pour des systèmes véhiculaires n'est pas toujours une tâche aisée. Des solutions existent dans le domaine de la radio logicielle où des plateformes flexibles qui prennent en charge un large éventail de différentes standards de communication sans fil peuvent être conçus. Une de ces architectures est la plateforme ExpressMIMO qui est développée par Eurecom et Télécom ParisTech. Les objectifs principales de cette thèse sont de proposer le premier prototype d'un récepteur pour ExpressMIMO, d'évaluer le potentiel de la plateforme pour les standards ayant des latences critiques, d'identifier des goulots d'étranglement et de proposer des solutions pour surmonter ces limitations. Comme standard, IEEE 802.11p a été choisi qui spécifie la communication entre des véhicules. Au-delà, nous étudions une possible exécution multimodal du 802.11p et du DAB sur ExpressMIMO. Notre analyse lors des expérimentations sur une cible FPGA révèle que le Front-End Processor DSP est lourdement chargé et que le temps de configuration requis dépasse le temps d'exécution. Pour relever ce défi nous proposons un Application Specific Instruction-Set Processor (ASIP) comme solution lorsque les contraintes de latence sont fortes. Pour compléter la chaîne de réception, nous présentons enfin un premier prototype de Préprocesseur qui connecte les convertisseurs A/D et D/A avec les autres composants de la bande de base. Dans ce contexte nous présentons un convertisseur générique et flexible pour le ré-échantillonnage qui travaille sur des rapports fractionnaires de fréquence d'échantillonnageDealing with the requirements of reconfigurable radio architectures in the vehicular domain is a very challenging task. Solutions can be found in the context of Software Defined Radio (SDR). Under its umbrella, flexible hardware platforms that support a wide range of different wireless communication standards are designed. One of them is the OpenAirInterface ExpressMIMO platform that is developed by Eurecom and Télécom ParisTech. Main objectives of this thesis are to propose the first receiver chain prototype for ExpressMIMO, to assess the applicability of the platform for latency critical standards, to identify design bottlenecks and to propose and implement solutions to overcome the identified limitations. Standard of interest in this context is IEEE 802.11p which is required for the Car-to-Car communication. Our analysis reveals that the Front-End Processing (FEP) DSP engine is heavily charged and that the required configuration time outreaches the pure execution time for short vectors. To meet this challenge we introduce an Application Specific Instruction-Set Processor (ASIP) as the solution of choice when dealing with strong latency requirements. To complete the receiver chain we further present a first Preprocessor prototype which connects the external A/D and D/A converters with the remaining baseband engine. In this context we focus on a generic, flexible and hardware optimized Sample Rate Converter (SRC) that is operating on fractional ratios. As the combination of Car-to-Car and Car-to-Infrastructure communications within only device enables various new applications for future cars we finally investigate on a possible multimodal execution of 802.11p and DAB on the chosen target platform
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Venmani, Daniel Philip. "Multi-operator greedy routing based on open routers." Phd thesis, Institut National des Télécommunications, 2014. http://tel.archives-ouvertes.fr/tel-00997721.
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Revolutionary mobile technologies, such as high-speed packet access 3G (HSPA+) and LTE, have significantly increased mobile data rate over the radio link. While most of the world looks at this revolution as a blessing to their day-to-day life, a little-known fact is that these improvements over the radio access link results in demanding tremendous improvements in bandwidth on the backhaul network. Having said this, today's Internet Service Providers (ISPs) and Mobile Network Operators (MNOs) are intemperately impacted as a result of this excessive smartphone usage. The operational costs (OPEX) associated with traditional backhaul methods are rising faster than the revenue generated by the new data services. Building a mobile backhaul network is very different from building a commercial data network. A mobile backhaul network requires (i) QoS-based traffic with strict requirements on delay and jitter (ii) high availability/reliability. While most ISPs and MNOs have promised advantages of redundancy and resilience to guarantee high availability, there is still the specter of failure in today's networks. The problems of network failures in today's networks can be quickly but clearly ascertained. The underlying observation is that ISPs and MNOs are still exposed to rapid fluctuations and/or unpredicted breakdowns in traffic; it goes without saying that even the largest operators can be affected. But what if, these operators could now put in place designs and mechanisms to improve network survivability to avoid such occurrences? What if mobile network operators can come up with low-cost backhaul solutions together with ensuring the required availability and reliability in the networks? With this problem statement in-hand, the overarching theme of this dissertation is within the following scopes: (i) to provide low-cost backhaul solutions; the motivation here being able to build networks without over-provisioning and then to bring-in new resources (link capacity/bandwidth) on occasions of unexpected traffic surges as well as on network failure conditions for particularly ensuring premium services (ii) to provide uninterrupted communications even at times of network failure conditions, but without redundancy. Here a slightly greater emphasis is laid on tackling the 'last-mile' link failures. The scope of this dissertation is therefore to propose, design and model novel network architectures for improving effective network survivability and network capacity, at the same time by eliminating network-wide redundancy, adopted within the context of mobile backhaul networks. Motivated by this, we study the problem of how to share the available resources of a backhaul network among its competitors, with whom a Service Level Agreement (SLA) has been concluded. Thus, we present a systematic study of our proposed solutions focusing on a variety of empirical resource sharing heuristics and optimization frameworks. With this background, our work extends towards a novel fault restoration framework which can cost-effectively provide protection and restoration for the operators, enabling them with a parameterized objective function to choose desired paths based on traffic patterns of their end-customers. We then illustrate the survivability of backhaul networks with reduced amount of physical redundancy, by effectively managing geographically distributed backhaul network equipments which belong to different MNOs using 'logically-centralized' physically-distributed controllers, while meeting strict constraints on network availability and reliability
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Buono, Vincenzo, and Petar Petrovic. "Enhance Inter-service Communication in Supersonic K-Native REST-based Java Microservice Architectures." Thesis, Högskolan Kristianstad, Fakulteten för naturvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hkr:diva-22135.
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The accelerating progress in network speeds and computing power permitted the architectural design paradigm to shift from monolithic applications to microservices. The industry moved from single-core and multi-threads, code-heavy applications, running on giant machines 24/7 to smaller machines, multi-cores single threads where computing power and memory consumption are managed very critically. With the advent of this novel approach to designing systems, traditional multi-tier applications have been broken down into hundreds of microservices that can be easily moved around, start, and stop quickly. In this context, scaling assumed a new meaning, rather than scaling up by adding more resources or computing power, now systems are scaled dynamically by adding more microservices instances. This contribution proposes a theoretical study and a practical experiment to investigate, compare and outline the performance improvements aid by the implementation of Protocol Buffers, Google's language-neutral, binary-based representational data interchange format over traditional text-based serialization formats in a modern, Cloud-Native, REST-based Java Microservice architecture. Findings are presented showing promising results regarding the implementation of Protobuf, with a significant reduction in response time (25.1% faster in the best-case scenario) and smaller payload size (72.28% better in the best-case scenario) when compared to traditional textual serialization formats while literature revealed out-of-the-box mechanisms for message versioning with backward compatibility.
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Diaz, Nava Mario. "Proposition d'une méthodologie de conception de circuits intégrés de communication : réalisation d'un communicateur pour le réseau local FIP." Phd thesis, Grenoble INPG, 1986. http://tel.archives-ouvertes.fr/tel-00320454.
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FIP=Factory Instrumentation Protocol. On réalise un circuit intégré de communication pour le réseau FIP, projet national de communication entre automates réflexes, capteurs et actionneurs. Le circuit intégré est spécifié pour permettre soit la connexion de capteurs simples, soit la connexion de capteurs intelligents ou des automates de réseau. La conception de ce circuit intégré «à la demande» résulte d'une méthodologie originale. Cette méthodologie est orientée vers la conception de circuits VLSI de communication à partir d'une bibliothèque d'opérateurs flexibles, d'une part pour réduire le temps de conception, d'autre part pour donner la possibilité aux ingénieurs non spécialistes en conception de concevoir eux-mêmes leur circuit
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Gailliard, Gregory. "Vers une approche commune pour le logiciel et le matériel de spécification et d'implémentation de systèmes embarqués temps-réels distribués, basée sur les intergiciels et les composants orientés objet." Phd thesis, Université de Cergy Pontoise, 2010. http://tel.archives-ouvertes.fr/tel-00524737.
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Cette thèse s'intéresse à la déclinaison matérielle des concepts logiciels d'intergiciel et d'architecture logicielle à base de composants, conteneurs et connecteurs dans les réseaux de portes programmables in situ (Field-Programmable Gate Array - FPGA). Le domaine d'applications ciblé est la radio définie logiciellement (Software Defined Radio (SDR)) conforme au standard Software Communications Architecture) (SCA). Avec le SCA, les applications radio sont décomposées en composants fonctionnels, qui sont déployés sur des plateformes radios hétérogènes et distribuées. Ces composants fournissent et requièrent des interfaces logicielles abstraites décrites sous forme de signatures d'opérations dans le langage de modélisation unifié appelé Unified Modeling language (UML) et/ou le langage de définition d'interface (Interface Definition Language - IDL) de l'intergiciel CORBA (Common Object Request Broker Architecture) standardisé par un consortium industriel appelé Object Management Group (OMG). Les besoins de portabilité et de réutilisation de ces composants requièrent que leurs interfaces abstraites définies au niveau système soient indépendantes d'une implémentation logicielle ou matérielle et puissent être indifféremment traduites dans un langage de programmation logiciel tel que C/C++, un langage système tel que SystemC au niveau transaction (Transaction Level Modeling - TLM), ou un langage de description matériel tel que VHDL ou SystemC au niveau registre (Register Transfer Level - (RTL)). Le besoin d'interopérabilité de ces composants requière des communications transparentes quelques soient leur implémentation logicielle ou matérielle et leur distribution. Ces premiers besoins ont été adressés en formalisant des règles de mise en correspondance entre des composants abstraits en OMG IDL3 ou UML2, des composants matériels à base de signaux en VHDL ou SystemC RTL, et des composants systèmes en SystemC TLM. Le deuxième besoin a été adressé en prototypant un intergiciel matériel utilisant de façon transparente le mapping mémoire et deux protocoles messages: CORBA General Inter-Object Request Broker Protocol (GIOP) et SCA Modem Hardware Abstraction Layer (MHAL).
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Brun, Philippe. "Conférence répartie en mode messagerie." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 1997. http://tel.archives-ouvertes.fr/tel-00941202.
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Les conférences informatiques sont promises à un bel avenir. Toutefois, leur essor est freiné par le coût des communications, les difficultés inhérentes à ce type d'outils qui s'adressent à un grand nombre d'utilisateurs, mettent en jeu de grandes quantités d'informations et couvrent un large champ d'applications, et par la nécessité d'offrir aux usagers un accès simple, confortable et efficace. La solution que nous proposons répond à ces problèmes par les options suivantes. L'ensemble des messages échangés est archivé dans une base structurée ce qui permet de les gérer efficacement. Cette base est dupliquée sur différents sites pour réduire les coûts de consultation. Les communications entre sites se font en mode messagerie telle qu'elle est recommandée par le CC11T. Pour une bonne coopération des usagers, des rôles sont définis, des droits leur sont associés. 'Enfin, l'interface avec l'utilisateur tire parti des progrès réalisés dans ce domaine tant dans le matériel que dans les logiciels actuellement disponibles.
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France, pillois Maxime. "Support matériel pour la communication inter-processus dans un système multi-coeur." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT062/document.
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La forte parallélisation des applications MPSoC accroît le besoin d'optimisation des mécanismes de synchronisation, primordiaux pour l'échange sûr d'informations entre processus. En effet, les délais qu'ils introduisent impactent les performances globales des MPSoC. L'objet de cette thèse est d'étudier puis d'optimiser les performances temporelles de ces mécanismes de synchronisation.La complexité croissante des MPSoC impose l'étude précise des mécanismes ciblés dans un environnement réaliste mettant en exergue les spécificités logicielles et matérielles.Les outils de mesures disponibles ne répondant pas à nos exigences de précision conjuguée à la vitesse d'analyse, nous avons conçu notre propre chaîne de mesure non intrusive reposant sur une plateforme d'émulation.Appliquée à l'étude de l'implémentation GNU du mécanisme de barrière de synchronisation offert par la bibliothèque d'aide à la parallélisation de code OpenMP, notre chaîne de mesure a mis en évidence deux faiblesses d'implémentation, aboutissant à la mise en place d'optimisations logicielles et matérielles réduisant de manière significative les délais de ce mécanisme.La chaîne de mesure développée nous a également permis de vérifier une hypothèse structurante pour l'optimisation : un verrou, bien qu'utilisé par plusieurs cœurs de différentes grappes au cours de l'application, est très souvent repris par le dernier cœur l'ayant libéré. Sur la base de ce constat, nous proposons une solution innovante assurant, de manière totalement décentralisée, la relocalisation dynamique des verrous dans la mémoire proche du cœur ayant obtenu l'accès. Cela permet de réduire la latence d'accès et le trafic réseau lors de la réutilisation d'un verrou par une même grappeHigh parallelism of MPSoC applications increase the need of optimization for the synchronization mechanisms, essential to ensure consistent data exchanges between threads. Delays inserted by them impact the whole performances of the system. This thesis work aims to analyze and reduce delays of synchronization mechanisms for MPSoC architectures.The growing complexity of MPSoCs requires assessment of proposed optimizations against hardware and software specifics in real-life environment. Since usual tools to perform measurements do not fulfill required accuracy with sufficient evaluation speed, we have designed a custom non-intrusive tool-chain based on an emulation platform.The study of the textit{GNU} OpenMP library implementation of the synchronization barriers, carried out with our tool-chain, has revealed two weaknesses. Our proposed hardware and software optimizations achieve significant reduction of the delays introduced by the synchronization barrier.The designed tool-chain has also allowed us to confirm a fundamental hypothesis for the optimization of the lock mechanism : although during the run time a lock may be used by various cores belonging to different clusters, it is often reused by the last core which has released it. Based on this observation, we propose an innovative decentralized solution to manage dynamic re-homing of locks in memory close to the last access-granted core, thus reducing access latency and network traffic in case of reuse of the lock by the same cluster