Aujourd'hui, la satisfaction du client et la joie deviennent les principaux différenciateurs pour évaluer l'efficacité des opérateurs télécoms et les fournisseurs de services. Dans ce marché concurrentiel, la mauvaise qualité de l'expérience (QoE) conduit à une réaction en chaîne de la parole négative de la bouche, pousser les clients dans les bras de concurrents en attente. Par conséquent, il est important pour les fournisseurs de services pour assurer la qualité supérieure de l'expérience afin d'éviter la déloyauté clientèle et la réputation négative. QoE est une émergence rapide multi-disciplinaire discipline axée sur la compréhension globale des exigences de qualité de l'homme sous différents angles tels que la technologie, des affaires et contexte d'utilisation. Le premier défi et avant tout est de comprendre comment différentes caractéristiques qui influencent liés à l'activité, la technologie, et le comportement influence du contexte humain. Dans cette thèse, les premiers travaux répond à ce défi de comprendre l'influence des domaines disparates sur QoE. Un modèle d'interaction QoE consolidée est proposé qui relie les domaines disparates (humains, des affaires, la technologie, et le contexte) pour comprendre la qualité globale de l'homme de l'expérience requise. Puis la taxonomie est présenté pour le modèle d'interaction QoE. Deuxième contribution dans cette thèse est basé sur le premier et son principal objectif est de capturer et analyser des données QoE à travers des études de l'utilisateur. Sur la base de données de l'utilisateur, l'influence des paramètres technologiques, contextuelles et d'affaires de plus de QoE sont évalués. Différents services multimédias ont été sélectionnés pour l'étude d'utilisateur tels que le service de streaming vidéo, la téléphonie (VoIP et PSTN), et service de téléconférence audio 3D. Selon le service multimédia, différents aspects ont été considérés lors de chaque étude sur les utilisateurs telles que les types de paramètres de service (QoS multimédia, le contenu, le contexte), les types de mesures (QoE subjective, objectif cognitif ou les deux), les caractéristiques de l'homme (âge, sexe, etc) , et les rôles de l'homme (l'utilisateur ou le client). Ces résultats aident à comprendre le lien entre QoE et d'autres domaines d'influence. La troisième contribution est basée sur les travaux en cours d'élaboration QoE des outils basés sur des services de streaming vidéo. Deux outils basés sur QoE pour l'évaluation des services multimédias ont été présentés dans cette thèse, leurs principales fonctions consistent à saisir, analyser et rapporter métriques QoE en temps réel. Ces outils sont utiles pour QoE mesure en temps réel de paramètres QoE / Today, the fulfillment of customer demands and user experience requirements are becoming the main differentiators for gauging the effectiveness of telecom operators and service providers. In this competitive market, the poor Quality of Experience (QoE) leads to a chain reaction of negative word of mouth, pushing customers into the arms of waiting competitors. Therefore it is important for service providers to ensure superior quality of experience in order to avoid customer disloyalty and negative reputation. QoE is a fast emerging multi-disciplinary field focused on understanding overall human quality requirements from different angles such as technology, business and context of use. The first and foremost challenge is to understand how different influencing characteristics related to business, technology, and context influence human behavior. In this thesis, initial work addresses this challenge of understanding the influence of disparate domains over QoE. A consolidated QoE interaction model is proposed which links disparate domains (human, business, technology, and context) to understand overall human quality of experience requirements. Then taxonomy is presented for QoE interaction model. Second contribution in this thesis is based on the first and its main objective is to capture and analyze QoE data through user studies. Based on user data, the influence of technological, contextual and business parameters over QoE are evaluated. Different multimedia services were selected for user study such as video streaming service, telephony (VoIP and PSTN), and 3D audio teleconferencing service. Depending upon multimedia service, different aspects were considered during each user study such as types of multimedia service parameters (QoS, content, context), the types of QoE metrics (subjective, objective cognitive or both), human characteristics (age, gender etc), and human roles (user, or customer). These findings help in understanding the link between QoE and other influencing domains. The third contribution is based upon ongoing work of developing QoE based tools for video streaming services. Two QoE based tools for the assessment of multimedia services have been presented in this thesis, their main functions are to capture, analyze and report QoE metrics in real time. These QoE tools are useful for real time measurement of QoE metrics

Hur vi människor kommer att leva i framtiden kan kraftigt påverkas utav konceptet Internet of Things. IoT erbjuder unika möjligheter för att hjälpa oss människor att automatisera och förenkla vissa ärenden. Även om koncpetet har funnits ett tag så har man fortfarande vilseledda åsikter kring potentialen med IoT. Det intressanta med konceptet och vad som enligt mig är den fundamentala grunden för IoT är självaste kommunikationen. Men hur går kommunikation till? Ett flertal IoT kommunikationsprotokoll har utvecklats för att försöka förbättra kommunikationen mellan två och flera smarta enheter. Eftersom det finns ett par olika kommunikationsprotokoll så är målet för denna studie att utvärdera och undersöka prestandan för befintliga applikations lagrade kommunikationsprotokoll. En litteraturrecension görs för att identifiera och få en djupare förståelse för deras unika egenskaper som skiljer protokollen åt. Alla protokoll som tas upp i denna rapport kommer inte att undersökas och valet av vilka protokoll som ska inspekteras närmare gjordes genom en jämförande analys där faktorer som kommunikationsmetod och begränsningen av nyttolast storleken beaktades. Latens, genomströmning och skalbarheten är de prestandafaktorerna som bedöms för de protokoll som valts för en närmare inspektion. Resultaten av dessa tester används för att dra slutsatser om lämpligheten för varje protokoll. Efter en omfattande utvärdering baserat på de experimenten som gjorts under projektets gång så drar denna rapport slutsatsen att MQTT och CoAP är de mest lämpliga protokollen för allmänna IoT-applikationer på grund av deras lätta, effektiva och skalbara natur. / The Internet of Things is a concept that has gained widespread attention and adaptation all around the world, but few people really do understand how it works and what it really is. The concept revolutionized the way we interact with our surroundings, it revolves around connectivity between smart devices and how they communicate with other devices or with humans. To ensure effective communication, a set of application layered protocols has been developed. These protocols are designed to be beneficial in certain areas, which is why the objective for this study has been to evaluate and examine the performance of existing application communication protocols. A thorough literature review is conducted to identify and gain a deeper understanding of their unique characteristics and features for some protocols that exist and are used today. All protocols brought up in this thesis will not be examined and choosing which protocols to inspect further was done by doing a comparative analysis where factors such as, communication method and payload limit size were taken into consideration. Performance assessment was done for the protocols that qualified, where factors like latency, throughput, and scalability were measured. The results of these tests are used to draw conclusions about the suitability of each protocol. After a comprehensive evaluation based on experiments with simulations and literature reviews, this thesis concludes that MQTT and CoAP as the most suitable protocols for general IoT applications due to their lightweight, efficient, and scalable nature.

School of Computing, Informatics and Media / Localised QoS routing is a relatively new, alternative and viable approach to solve the problems of traditional QoS routing algorithms which use global state information resulting in the imposition of a large communication overhead and route flapping. They make use of a localised view of the network QoS state in source nodes to select paths and route flows to destination nodes. Proportional Sticky Routing (PSR) and Credit Based Routing (CBR) have been proposed as localised QoS routing schemes and these can offer comparable performances. However, since network state information for a specific path is only updated when the path is used, PSR and CBR operate with decision criteria that are often stale for paths that are used infrequently. The aim of this thesis is to focus on localised QoS routing and contribute to enhancing the scalability of QoS routing algorithms. In this thesis we have developed three new localised QoS routing schemes which are called Score Based QoS Routing (SBR), Bandwidth Based QoS Routing (BBR) and Delay Based Routing (DBR). In some of these schemes, the path setup procedure is distributed and uses the current network state to make decisions thus avoiding problems of staleness. The methods also avoid any complicated calculations. Both SBR and BBR use bandwidth as the QoS metric and mean delay is used as the QoS metric in DBR. Extensive simulations are applied to compare the performance of our proposed algorithms with CBR and the global Dijkstra¿s algorithm for different update intervals of link state, different network topologies and using different flow arrival distributions under a wide range of traffic loads. It is demonstrated by simulation that the three proposed algorithms offer a superior performance under comparable conditions to the other localised and global algorithms.

Made available in DSpace on 2016-08-17T14:52:57Z (GMT). No. of bitstreams: 1 Jose Coelho de Melo.pdf: 1424511 bytes, checksum: 76fbc2d3ff58f82123072e2b8323be1a (MD5) Previous issue date: 2005-03-14 / This work presents several ways of using mechanisms of Quality of Service (QoS) in networks hardwired for links of short band. It is demonstrated that the use of mechanisms of QoS brings profits of performance for priority applications and rationality in the use of band resources. The work is developed in a test platform of Previdência Social. Implementations of the PHBs EF, Afs and BE are tested. The work has evaluated the capacities to offer guaranteed band, traffic priority, conditioning of traffic and the impact of the competition between traffic classes. The experiments are mounted using the architecture of differentiated services (DiffServ) of platform Cisco, that is the standard in the network of the Previdência Social and are manipulated the mechanisms of classification, control of congestion, policing and conformation of traffic. The results give subsidy for implementation of some models of QoS in IP networks, mainly for those that serve short band. / Este trabalho apresenta diversas maneiras de utilização dos mecanismos de Qualidade de Serviço (QoS) em redes ligadas por enlaces de banda estreita. É demonstrado que o uso de mecanismos de QoS traz ganhos de performance aos aplicativos prioritários e racionalidade no uso de recursos de banda. O trabalho é desenvolvido em uma plataforma de teste que retrata um seguimento da rede da Previdência Social. São testadas possíveis implementações dos PHBs EF, Afs e BE. São avaliadas as capacidades de oferecer largura de banda garantida, priorização de tráfego, condicionamento de tráfego e o impacto da concorrência entre classes de tráfego. Os experimentos são montados utilizando a arquitetura de serviços diferenciados (DiffServ) da plataforma Cisco, que é o padrão na rede da Previdência Social, e são manipulados os mecanismos de classificação, controle de congestionamento, policiamento e conformação de tráfego. O resultado apresentado dá subsídio para implementação de vários modelos de QoS em redes IP, principalmente para redes servidas por banda estreita.

ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, California / This paper presents a model for Quality of Service (QoS) management in a mix of fixed Ground Station (GS) and ad-hoc telemetry networks, and introduces an enhanced clustering scheme that jointly optimizes the performance of the network using multiple distance measures based on the location of the wireless nodes and the traffic level. It also demonstrates that a "power" performance measure is an effective tool for modeling and managing QoS in Mixed Networks. Simulation results show that significant QoS performance improvements can be obtained and maintained even under severe traffic conditions.

Distributed multimedia supports a symbiotic infotainment duality, i.e. the ability to transfer information to the user, yet also provide the user with a level of satisfaction. As multimedia is ultimately produced for the education and / or enjoyment of viewers, the user’s-perspective concerning the presentation quality is surely of equal importance as objective Quality of Service (QoS) technical parameters, to defining distributed multimedia quality. In order to extensively measure the user-perspective of multimedia video quality, we introduce an extended model of distributed multimedia quality that segregates quality into three discrete levels: the network-level, the media-level and content-level, using two distinct quality perspectives: the user-perspective and the technical-perspective. Since experimental questionnaires do not provide continuous monitoring of user attention, eye tracking was used in our study in order to provide a better understanding of the role that the human element plays in the reception, analysis and synthesis of multimedia data. Results showed that video content adaptation, results in disparity in user video eye-paths when: i) no single / obvious point of focus exists; or ii) when the point of attention changes dramatically. Accordingly, appropriate technical- and user-perspective parameter adaptation is implemented, for all quality abstractions of our model, i.e. network-level (via simulated delay and jitter), media-level (via a technical- and user-perspective manipulated region-of-interest attentive display) and content-level (via display-type and video clip-type). Our work has shown that user perception of distributed multimedia quality cannot be achieved by means of purely technical-perspective QoS parameter adaptation.

ITC/USA 2011 Conference Proceedings / The Forty-Seventh Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2011 / Bally's Las Vegas, Las Vegas, Nevada / This paper presents a method for the management of mixed networks as envisioned in future iNET applications and develops a scheme for global optimal performance for features that include signal to Noise Ratio (SNR), Quality of service (QoS), and Interference. This scheme demonstrates potential for significant enhancement of performance for dense traffic environments envisioned in future telemetry applications. Previous research conducted at Morgan State University has proposed a cellular and Ad hoc mixed network for optimum capacity and coverage using two distance measures: QoS and SNR. This paper adds another performance improvement technique, interference, as a third distance measure using an analytical approach and using extensive simulation with MATLAB. This paper also addresses solutions where performance parameters are correlated and uncorrelated. The simulations show the optimization of mixed network nodes using distance, traffic and interference measures all at one time. This has great potential in mobile communication and iNET.

No description available.

In the past decades, mobile traffic generated by devices such as smartphones, iphones, laptops and mobile gateways has been growing rapidly. While traditional direct connection techniques evolve to provide better access to the Internet, a new type of wireless network, mobile ad hoc network (MANET), has emerged. A MANET differs from a direct connection network in the way that it is multi-hopping and self-organizing and thus able to operate without the help of prefixed infrastructures. However, challenges such dynamic topology, unreliable wireless links and resource constraints impede the wide applications of MANETs. Routing in a MANET is complex because it has to react efficiently to unfavourable conditions and support traditional IP services. In addition, Quality of Service (QoS) provision is required to support the rapid growth of video in mobile traffic. As a consequence, tremendous efforts have been devoted to the design of QoS routing in MANETs, leading to the emergence of a number of QoS support techniques. However, the application independent nature of QoS routing protocols results in the absence of a one-for-all solution for MANETs. Meanwhile, the relative importance of QoS metrics in real applications is not considered in many studies. A Best Effort QoS support (BEQoS) routing model which evaluates and ranks alternative routing protocols by considering the relative importance of multiple QoS metrics is proposed in this thesis. BEQoS has two algorithms, SAW-AHP and FPP for different scenarios. The former is suitable for cases where uncertainty factors such as standard deviation can be neglected while the latter considers uncertainty of the problems. SAW-AHP is a combination of Simple Additive Weighting and Analytic Hierarchical Process in which the decision maker or network operator is firstly required to assign his/her preference of metrics with a specific number according to given rules. The comparison matrices are composed accordingly, based on which the synthetic weights for alternatives are gained. The one with the highest weight is the optimal protocol among all alternatives. The reliability and efficiency of SAW-AHP are validated through simulations. An integrated architecture, using evaluation results of SAW-AHP is proposed which incorporates the ad hoc technology into the existing WLAN and therefore provides a solution for the last mile access problems. The protocol selection induced cost and gains are also discussed. The thesis concludes by describing the potential application area of the proposed method. Fuzzy SAW-AHP is extended to accommodate the vagueness of the decision maker and complexity of problems such as standard deviation in simulations. The fuzzy triangular numbers are used to substitute the crisp numbers in comparison matrices in traditional AHP. Fuzzy Preference Programming (FPP) is employed to obtain the crisp synthetic weight for alternatives based on which they are ranked. The reliability and efficiency of SAW-FPP are demonstrated by simulations.

In the recent years, the mobile gaming has been tremendously increased because of its enormous entertainment features. Mobile cloud gaming is a promising technology that overcomes the implicit restrictions such as computational capacity and limited battery life. GamingAnywhere is an open source cloud gaming system which is used in this thesis to measure the Quality of service of mobile cloud gaming. The aim of the thesis is to measure the QoS used in GamingAnywhere for mobile cloud gaming. Games are streamed from the server to the mobile client. In our study, QoS is measured using Differentiated Service (DiffServ) architecture for the traffic shaping. The research method is carried out using an experimental testbed. Dummynet is used for traffic shaping. Performance is measured in terms of bitrate, packet loss, jitter, and frame rate. Different resolutions of the game are considered in our empirical research and our results show that the framerate and bitrate have increased with the impact of network delay. / <p>Ganesh Grandhi: +46767671612</p>