O presente trabalho teve como objetivo propor e testar uma metodologia para a realização de bindings dinâmicos na tecnologia LonWorks®, com a finalidade de permitir que um Sistema Distribuído de Comunicação Telefônica Privada (SDCTP), também desenvolvido com a tecnologia LonWorks®, realizasse seus enlaces telefônicos. Para tal, utilizou-se uma metodologia voltada para equipamentos embarcados e a visão de agentes reativos no desenvolvimento de cada dispositivo de rede, oferecendo uma solução única, prática e totalmente inédita na tecnologia LonWorks® e nos dispositivos de PABX. Essa visão resultou no desenvolvimento de dispositivos inteligentes e totalmente autônomos, no que diz respeito aos seus processos internos, gerando resultados satisfatórios e mais eficientes do que se esperava com base nos requisitos levantados para o sistema SDCTP. Este trabalho é o ponto de partida e oferece uma base para o desenvolvimento de novas funcionalidades, tanto nos sistemas de telefonia atuais, quanto nas redes de controle. / This presentation has the goal to propose and test a new method to implement dynamic bindings in LonWorks® technology, allowing a new Private Telephony Comunication Distributed System (SDCTP), also developed with LonWorks® technology, to make their telephone links. In order to do this, a method for developping embedded systems and the reactive agent view was applied for each different devices in this new system, thus offering a unique, practical and innovative solution for both, LonWorks® and PBX systems. This view allowed the implementation of intelligent and autonomous devices, specially in their internal process, thus granting satisfactory and more efficient results based on the SDCTP requirements. This work is the kick-off and the basis for developing new functions for telephone systems and control networks.

Made available in DSpace on 2016-04-27T14:31:19Z (GMT). No. of bitstreams: 1 Angeles Treitero Garcia Consolo.pdf: 1333169 bytes, checksum: 2ddcc3df9d5387f8fa0caadf55c6bc8e (MD5) Previous issue date: 2014-02-17 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / This research contains a study on mobile devices, more precisely mobile telephony applied to educational purposes. The general aim here is to investigate the absence of methodologies in degree courses, related to the use of Information Technology and Communication (ICTs), in order to incorporate the use of mobile telephony. The target is to identify relevant procedures a professor should incorporate in his/her pedagogical practices in order to face the challenges mobile technology poses for the teaching-learning process in the beginning of the 21st century. More specific objectives of this paper are the verification of the political and instructional use of the ICTs in Brazilian Education; an analysis of the pedagogical potentialities and the reflexes mobile phones currently cause in Brazilian Education; and a thorough examination of the concept of mobility, when considering the use of such technology. Whereas this paper involves several areas of knowledge, the theoretical approach has a multi-disciplinary character, since the early stages of written communication in societies and along its development. This work includes a discussion on the possibilities mobile technology provides regarding the access to information and to communication, and the challenge future professors should have concerning education. After a field research, an analysis of the uses of mobile phones and their applicability, as well as an analysis of what professors and degree students think of the use of such technology in Education were developed, allowing the discussion of the current need of new pedagogical practices when performing the teaching profession. Such field research was carried in three universities of the private sector, with the participation of professors and students of degree courses. All of them answered a questionnaire with open and closed questions, with the collection of quantitative and qualitative data. This paper includes five chapters: in the first chapter I present the research project; in the second, I discuss the influence of ICTs in Brazilian Education; in the third one I present some reflections on the question and statistical data regarding the potentialities mobile technology provides; in the fourth chapter, I discuss the concept of mobility and suggest some of the questions posed to degree professor when dealing with projects including such technology; in the last one, I present an analysis of the field research results. As a result of this work, one concludes that professors are not yet considering the possibility of using that kind of technology to support education. Such use is viable, as long as it becomes part of pedagogical projects in schools and of the curriculum. The involvement of all school community is also necessary. Additionally, educational institutions must offer conditions for professors to keep themselves updated and get ready to engage in new activities with students. This paper shows that mobile devices, like any other kind of technology, are one more possible tool to be used on a daily basis by educators. Like many other procedures and resources, the use of Information Technology and Communication will not solve, by itself, the educational problems in Brazil / Esta tese refere-se a um estudo sobre os dispositivos móveis, mais especificamente, sobre a telefonia celular aplicada a práticas educativas. O objetivo geral do trabalho consistiu na investigação da ausência de metodologias que se inter-relacionem, nos cursos de licenciatura de uso da Tecnologia de Informação e Comunicação (TICs), para apropriação do uso da telefonia celular. Pretende-se que, com este estudo, seja possível identificar alguns aspectos relevantes que um professor da educação formal deve incorporar em suas práticas pedagógicas para enfrentar os desafios que a tecnologia móvel apresenta para o ensino-aprendizagem neste início do século XXI. Os objetivos específicos deste trabalho foram: pesquisar as influências políticas e instrucionais das TICs na Educação brasileira, analisar as potencialidades pedagógicas e os reflexos que os telefones celulares estão causando na Educação brasileira e examinar atentamente o conceito de mobilidade, que está implícito quando se fala de uso dessa tecnologia. Tendo em vista que este trabalho envolve várias áreas do conhecimento, o referencial para as discussões tem caráter multidisciplinar; situa-se entre autores que tratam de processos comunicacionais, educacionais e tecnológicos, desde os primórdios e ao longo do desenvolvimento da comunicação escrita nas sociedades. Procurou-se entender as possibilidades que a tecnologia móvel promove no sentido de acesso à informação e à comunicação, bem como aos desafios que um futuro professor deverá ter para com a Educação. Por meio da pesquisa de campo, foi feita a análise da utilização e da aplicabilidade dos telefones celulares bem como do que pensam professores e alunos de cursos de licenciatura a respeito do uso dessa tecnologia na Educação, para discutir a necessidade de novas práticas pedagógicas quando se exerce a profissão de professor atualmente. Essa pesquisa foi realizada em três universidades da rede particular, com professores e alunos dos cursos de licenciatura. Todos responderam a um questionário, com perguntas abertas e fechadas, que serviu para coleta de dados quantitativos e qualitativos. O trabalho apresenta cinco capítulos: no primeiro, é apresentado o projeto de pesquisa; no segundo, é discutida a influência das TICs na Educação brasileira; no terceiro capítulo, são apresentados algumas reflexões e dados estatísticos a respeito das potencialidades que a tecnologia móvel proporciona; no quarto capítulo, procura-se discutir o conceito de mobilidade e fornecer algumas reflexões que um professor de licenciatura deve realizar para tratar de projetos que incluam tal tecnologia; no último, apresenta-se a análise dos dados da pesquisa de campo. No final, apontam-se algumas considerações geradas pelo trabalho: os professores ainda não estão pensando nessa tecnologia para apoiar a Educação, ela é viável desde que esteja inserida em projetos pedagógicos na escola e nos currículos e que haja o envolvimento de toda a comunidade escolar, as instituições educacionais têm que oferecer condições para que os professores se atualizem e se preparem para exercer novas atividades com os alunos. O trabalho indica que os dispositivos móveis, como qualquer outra tecnologia, são mais uma ferramenta que pode ser usada no dia a dia de um educador e de um educando. Como outros procedimentos e recursos, o uso das Tecnologias da Informação e Comunicação, sozinho, não vai resolver os problemas que o Brasil tem com a Educação

O presente trabalho teve como objetivo propor e testar uma metodologia para a realização de bindings dinâmicos na tecnologia LonWorks®, com a finalidade de permitir que um Sistema Distribuído de Comunicação Telefônica Privada (SDCTP), também desenvolvido com a tecnologia LonWorks®, realizasse seus enlaces telefônicos. Para tal, utilizou-se uma metodologia voltada para equipamentos embarcados e a visão de agentes reativos no desenvolvimento de cada dispositivo de rede, oferecendo uma solução única, prática e totalmente inédita na tecnologia LonWorks® e nos dispositivos de PABX. Essa visão resultou no desenvolvimento de dispositivos inteligentes e totalmente autônomos, no que diz respeito aos seus processos internos, gerando resultados satisfatórios e mais eficientes do que se esperava com base nos requisitos levantados para o sistema SDCTP. Este trabalho é o ponto de partida e oferece uma base para o desenvolvimento de novas funcionalidades, tanto nos sistemas de telefonia atuais, quanto nas redes de controle. / This presentation has the goal to propose and test a new method to implement dynamic bindings in LonWorks® technology, allowing a new Private Telephony Comunication Distributed System (SDCTP), also developed with LonWorks® technology, to make their telephone links. In order to do this, a method for developping embedded systems and the reactive agent view was applied for each different devices in this new system, thus offering a unique, practical and innovative solution for both, LonWorks® and PBX systems. This view allowed the implementation of intelligent and autonomous devices, specially in their internal process, thus granting satisfactory and more efficient results based on the SDCTP requirements. This work is the kick-off and the basis for developing new functions for telephone systems and control networks.

Dans cette thèse, nous proposons des modifications de conception d’antenne PIFA concernant la téléphonie mobile afin de réduire le taux de pénétration des ondes électromagnétiques dans la tête. Trois antennes ont été considérées: une antenne PIFA à bande unique fonctionnant à 1,8 GHz, une antenne PIFA à bande double fonctionnant à 900 MHz et à 1,8 GHz, et une antenne PIFA tri-bande à 900 MHz, 1800 MHz et 2400 MHz. La densité de courant de surface le long du plan de masse a été réduite en diminuant le rayonnement du champ électrique émis par l’antenne émettrice vers le corps, ce qui a entraîné une réduction de la densité de courant le long de la tête humaine ainsi que du SAR. Cette réduction du SAR a été réalisée en insérant plusieurs traitements de bords tels qu'une forme en U à chaque coin du plan de masse de l'antenne. Nous avons étudié trois types des antennes : la première, lorsque les bords U sont constitués de PEC, nous obtenons une réduction du SAR de 78,6%. La seconde utilise un type de liquide considéré comme absorbant. Avec ce liquide, deux antennes ont été analysées: une PIFA à bande unique fonctionnant à 1,8 GHz et une PIFA à bande double fonctionnant à 900 MHz et à1,8 GHz. Dans ce scénario, le bord en U est constitué d’eau, et nous avons constaté que la valeur maximale du SAR moyen sur 10 g de tissu était réduite à 73,52% pour une PIFA à bande unique, tandis que le pic de SAR a été réduit à 88,78% et 90,31% en cas de double bande. Afin de préserver la hauteur de l'antenne et de la rendre plus réaliste, un autre type d’antenne a été modélisé en insérant des arêtes en forme de U à chaque extrémité du plan de masse. Dans ce cas, la réduction du SAR a été la suivante: 74,5% à 1800 MHz pour une bande unique et environ 64,37%, 79,92% et 54,71% à 900 MHz, 1800 MHz et 2400 MHz pour une antenne tri-bande, et pour une moyenne de masse de tissu égale à 10g. Dans une dernière partie, cette thèse propose une antenne optimisée pour des transmissions de la station de base vers l'utilisateur d’un téléphone mobile, en exploitant la bande GSM-900. L’objectif principal de cette étude est de fournir une intensité de champ constante sur la surface de couverture, afin de minimiser certains effets biologiques considérés comme dangereux pour la santé humaine. / In this thesis, we propose new types of mobile handset PIFA antenna design to reduce the specific absorption rate (SAR) in human head. Three antennas were considered: a single band PIFA operating at 1.8 GHz, a dual band PIFA operating at 900 MHz and 1.8 GHz, and a Triband PIFA operating at 900MHz, GSM 1800MHz, and 2400MHz. Surface current density along the ground plane was decreased by reducing the near electric field radiation coming from the radiating antenna to the human head, which in turns leads to a reduction in current density along human head as well as the SAR. This SAR reduction is accomplished by inserting several edges treatment such as U-shape at each corner of the ground plane of antenna. In this scenario, we studied three types: first one, when U-edges are made of PEC, we get SAR reduction about 78.6%. Second one is a liquid type that is considered as more advanced type. For this type, two antennas are considered: a single band PIFA operating at 1.8 GHz, and a dual band PIFA operating at 900 MHz and 1.8 GHz. In this scenario, two cases were studied: first one when the U-edge is made of water, we noticed that the peak SAR value averaged over 10 g mass tissue was reduced to 73.52% in the case of single band PIFA, whereas the peak SAR was reduced to 88.78% and 90.31% in case of dual band. Second case, when U-edge filled with water, this enhanced structure was presented to overcome the manufacturing limitations of the first case design. Simulation results showed a better performance in terms of reflection coefficient and radiation pattern for both single-band and dual-band antennas. The results of SAR were also similar to the first case structure design for the single-band antenna. However, the SAR was slightly higher for the dual-band antenna, but it still remains very low (1.6 W/Kg at 900 MHz and 0.6 W/Kg at 1800 MHz). After that, for preserving the height of antenna, and making it more realistic to be applied, another type was done by inserting U-edges above each corner of the ground plane. In this case, we get SAR reduction as follows: 74.5% at GSM1800MHz in case of single band, and about 64.37%, 79.92%, and 54.71% at GSM900MHz, GSM1800MHz, and 2400 MHz in case of Tri-band averaged over 10g mass tissue. On the other hand, this thesis presents a modern and unprecedented safety antenna that transmits from the base station to the mobile user being operated at the GSM-900 band. The main objective of this study is to provide a constant field strength or a uniform coverage over a certain surface area, for preventing human health from several hazardous biological effects, and this strongly depends on the studied site (e.g. if it is densely urban, rural, open area, etc.). Our proposed design is synthesized using S.A.R.A (Synthesis of Array of Antenna) software. Besides, Atoll GSM planning tool is used to ensure the signal coverage and power strength for the safety antenna, and CST (Computer Simulation Technology) software for simulating the proposed antenna.

隨著資訊通訊技術的快速發展，Internet已成為全世界最重要的資料乘載工具，以IP為基礎的多媒體通訊架構，逐漸取代傳統電話的溝通模式，成為企業快速佈署與協同運作的最佳選擇。透過整合通訊系統（Unified Communications, UC）的導入，企業可以將網路電話、視訊會議、電子郵件、即時通訊與行動裝置等通訊系統整合在同一個平台上，以大幅提升企業協同運能力，並有效的提升企業運作效率。 現今企業內部充斥著各種溝通工具，從傳統的電話、傳真到Internet興起後的MSN與Skype，這些工具廣泛的運用在商務運行中，其目的皆為了增加溝通效率並節省溝通成本，但這些雜亂無章的溝通方式若未能有效整合，將衍生許多資訊安全與系統相容性問題。 UC的觀念已在許多國際大型企業中獲得驗證，而台灣這個充滿創造力的科技島，在資通訊運用的腳步必須與世界接軌，妥善運用自身優勢，以確保在這波國際化浪潮中，持續保持競爭優勢。本研究經由個案訪談大型銀行業、電子製造業與顧問服務業，以科技接受模型為架構，分別探討個人、組織、技術、任務與環境等五大構面所組成的外部變數，對於UC系統採用之有用與易用認知影響，找出影響企業採用整合通訊系統的相關因素，以做為未來企業在採用整合通訊系統時之參考。 關鍵字：Unified Communications，UC，IP Phone，整合通訊系統，TAM，科技接受模型，VoIP，網路電話 / Along with the fast development of the information technology technique, combined with the adoption of Internet that made the Internet the most important transmission tool for communications, the IP-based multi-media communication framework has gradually replacing the traditional fixed-line telephone systems and has become the optimum option for the enterprises for their business establishments and their organizational synchronization. By applying the Unified Communications (UC), enterprises are able to integrate their IP Telephony, Video Conference, e-mail, Instant Message and Mobile Communication devices into the same platform; as a result, the systematic integration has greatly advanced the level of synchronization and improved the efficiency of the business operation. The multiple communication equipment being used such as the traditional telephone, fax, MSN and Skype are for the purposes of enhancing the efficiency of communication and reduce costs. However, the information security and compatibility amongst different systems may become problematic if the integration is not being carefully organized. The adoption of UC was proven to be a success by many international enterprises that has integrated it into their business practices. Therefore, Taiwan, with its good reputation of an island of technology and one who is renowned with its creativity, should keep up to speed with the world in adopting the prevalent information technology. We should keep maintaining our competitive advantage that we have developed over the years. This Study was conducted through interviews with large bank, electronic product manufacturer and consulting services company. The research was based on the TAM framework to analyze the five aspects of the external variables namely, individual, organization, technique, mission and environment. In addition, this Study intends to seek a result that will provide an enterprise a future reference about the factors that can influence in making a decision on the feasibility and applicability of adopting the Unified Communications. Key Words: Unified Communications, UC, IP Phone, TAM（Technology Acceptance Model）, VoIP（Voice over Internet Protocol）, IP Telephony

<p>Under de senaste åren har Internettelefonin varit på frammarsch, och i takt med att tekniken mognat har fler och fler börjat se den som ett alternativ till att ringa via telefonnätet. Förutom att det är billigare att ringa över det förstnämnda, så erbjuder Internettelefonin också en rad revolutionerande tjänster. Det är dock troligt att telefonnätet kommer att få tjänstgöra i många år till, och det erbjuder fortfarande överlägset bäst stabilitet och har stor acceptans. Om de två telefoninätverken ska existera sida vid sida, med varsina användarbaser är det lämpligt om de kan fås att samverka, så att användare av det ena kan ringa användare av det andra, och vice versa. Detta kan göras med en VoIP/PSTN-gateway, som översätter kontrollinformation och rösttrafik mellan de två nätverken.</p><p>Uppsatsen handlar om det arbete vi har utfört år TietoEnator i Karlstad. Uppgiften bestod i att utveckla en prototyp av en VoIP/PSTN-gateway. Från början var det avsett att systemet skulle klara uppringning från endera en ”vanlig” telefon, eller en så kallad IP-telefon. Därtill skulle rösttrafiken överföras genom ändamålsenlig hårdvara. För att utföra arbetet behövde vi först studera relevanta kommunikationsprotokoll både för telefonnätet och för Internet, för att se hur dessa kunde fås att samverka. Vi behövde också lära oss tillgängliga system, bibliotek och verktyg för att förstå hur vi skulle skapa vårt eget system i den efterkommande implementeringsfasen. På grund av en lång inläsningsperiod och inledande tekniska problem, samt att nödvändig hårdvara för översättning av rösttrafiken inte anlände i tid begränsades arbetet till att innefatta samtal initierade från den vanliga telefonen till ip-telefonen, utan röstöverföring. Likväl har ett resultatgivande arbete utförts, och det beskrivs i detalj i rapporten.</p> / <p>During the past few years Internet telephony has advanced rapidly, and as the technology has evolved, more and more have come to consider it an alternative to making phone calls through the telephone network. Besides being cheaper, Internet telephony also provides several revolutionary services. It is likely though that the telephone network will remain in use for several years to come, and it still offers by far the best stability and is accepted by most people. If the two networks are to coexist, with their respective users, it would be useful if they could be made to interact, so that users of one network can call users of the other, and vice versa. This can be done with a VoIP/PSTN gateway, which translates control information and voice traffic between the two networks.</p><p>Our dissertation is about the work we have performed for TietoEnator in Karlstad. The assignment was to develop a prototype of a VoIP/PSTN gateway. Initially the system was meant to support phone calls initiated either from an “ordinary” phone or from an IP telephone. Also the voice traffic was supposed to be translated with the use of appropriate hardware. To manage this we first needed to study all the relevant protocols for communication used in the telephone network and on the Internet, to get an idea of how these could be made to interact. We also had to learn existing systems, libraries and tools in order to see how we could create our own system. Due to a long learning period and technical problems in the beginning, and because the necessary hardware equipment for translation of voice traffic did not arrive in time, the assignment was limited to include only calls initiated from the ordinary phone to the IP telephone, without voice transmission. Never the less, the efforts have produced results, and our work is explained in detail in this dissertation.</p>

<p>Providing carrier grade characteristics for Internet Protocol (IP) communication applications is a significant problem for IP application providers in order to offer integrated services that span IP&nbsp / and telecommunication networks. This thesis addresses the provision of life-cycle management, which is only one carrier grade characteristic, for a SoftBridge application, which is an example of IP communication applications. A SoftBridge provides semi-synchronous multi-modal IP-based communication. The work related to IP-Telecommunication integrated services and the SoftBridge is analyzed with respect to life-cycle management in a literature review. It is suggested to use an Application Server in a Next Generation Network (NGN) to provide life-cyclemanagement functionality for IP-Telecommunication applications. In this thesis, the Application Server is represented by a JAIN Service Logic Execution Environment(JSLEE), in which&nbsp / a SoftBridge application can be deployed, activated, deactivated, uninstalled and upgraded online.Two methodologies are applied in this research: exploratory prototyping, which evolves the development of a SoftBridge application, and empirical comparison, which is concerned with the empirical evaluation of a SoftBridge application in terms of carriergrade capabilities. A SoftBridge application called SIMBA&nbsp / provides a Deaf Telephony service similar to aprevious Deaf Telephony SoftBridge, However, SIMBA&rsquo / s SoftBridge design and implementation are unique to this thesis. In order to test the life-cycle&nbsp / management ability of SIMBA, an empirical evaluation is carried out including the experiments oflife-cycle management and call-processing performance. The final experimental results of the evaluation show that a JSLEE is able to provide life-cycle management for SIMBA without causing a significant decrease in performance. In conclusion, the life-cycle management can be provided&nbsp / or a SoftBridge application by using an Application Server such as a JSLEE. Futhermore, the results indicate that&nbsp / approach of using Application Server (JSLEE) integration should be&nbsp / sufficiently general to provide life cycle management, and indeed other carrier grade capabilities, for other IP communication applications. This allows IP communication applications to be&nbsp / &nbsp / &nbsp / integrated into an NGN.</p>

<p>Providing carrier grade characteristics for Internet Protocol (IP) communication applications is a significant problem for IP application providers in order to offer integrated services that span IP&nbsp / and telecommunication networks. This thesis addresses the provision of life-cycle management, which is only one carrier grade characteristic, for a SoftBridge application, which is an example of IP communication applications. A SoftBridge provides semi-synchronous multi-modal IP-based communication. The work related to IP-Telecommunication integrated services and the SoftBridge is analyzed with respect to life-cycle management in a literature review. It is suggested to use an Application Server in a Next Generation Network (NGN) to provide life-cyclemanagement functionality for IP-Telecommunication applications. In this thesis, the Application Server is represented by a JAIN Service Logic Execution Environment(JSLEE), in which&nbsp / a SoftBridge application can be deployed, activated, deactivated, uninstalled and upgraded online.Two methodologies are applied in this research: exploratory prototyping, which evolves the development of a SoftBridge application, and empirical comparison, which is concerned with the empirical evaluation of a SoftBridge application in terms of carriergrade capabilities. A SoftBridge application called SIMBA&nbsp / provides a Deaf Telephony service similar to aprevious Deaf Telephony SoftBridge, However, SIMBA&rsquo / s SoftBridge design and implementation are unique to this thesis. In order to test the life-cycle&nbsp / management ability of SIMBA, an empirical evaluation is carried out including the experiments oflife-cycle management and call-processing performance. The final experimental results of the evaluation show that a JSLEE is able to provide life-cycle management for SIMBA without causing a significant decrease in performance. In conclusion, the life-cycle management can be provided&nbsp / or a SoftBridge application by using an Application Server such as a JSLEE. Futhermore, the results indicate that&nbsp / approach of using Application Server (JSLEE) integration should be&nbsp / sufficiently general to provide life cycle management, and indeed other carrier grade capabilities, for other IP communication applications. This allows IP communication applications to be&nbsp / &nbsp / &nbsp / integrated into an NGN.</p>

As the complexity of software system increases, delivering quality software successfully becomes an ever more challenging task. Applying automated testing techniques effectively to the software development process can reduce software testing effort substantially and assure software quality cost-effectively. Thus the future of software testing will rely heavily on automated testing techniques. This thesis describes a practical approach to automated software testing by investigating and analyzing different automation test tools in real-world situations. In view of the fact that the key to successful automated testing is planning, understanding the requirements for automated testing and effectively planning is critical and essential. iv This thesis presents the design and implementation of an automated testing framework. It consists of an automated testing tool, which is based on the commercial product TestComplete, as well as associated testing processes. The application area is telephony communications software. To demonstrate the viability of our automated testing approach, we apply our testing framework to a Voice-over-IP telephony application called Desktop Assistant. This case study illustrates the benefits and limitations of our automated testing approach effectively.

Αντικείμενο της παρούσας διπλωματικής εργασίας είναι η μελέτη των μεθόδων βελτιστοποίησης της ποιότητας των παρεχομένων υπηρεσιών των δικτύων κυτταρικής τηλεφωνίας τρίτης γενιάς σε διαλειπτικό περιβάλλον. Αρχικά γίνεται μια σύντομη ιστορική αναδρομή στην εξέλιξη των συστημάτων κινητών επικοινωνιών και παρουσιάζεται το σημαντικότερο πρότυπο τρίτης γενιάς, το UMTS και τα ιδιαίτερα τεχνικά χαρακτηριστικά του. Στην συνέχεια αναλύεται το LTE το οποίο αποτελεί την τελευταία εξέλιξη των δικτύων τρίτης γενιάς και αναμένεται να αντικαταστήσει το UMTS στο άμεσο μέλλον αποτελώντας στην πραγματικότητα τον πρόδρομο των συστημάτων τέταρτης γενιάς. Στην συνέχεια εστιάζουμε στα διαλειπτικά κανάλια αναλύοντας τα φαινόμενα που παρατηρούνται σε αυτά και τα στατιστικά μοντέλα μέσα από τα οποία περιγράφονται. Παράλληλα διερευνάται η επίδραση των φαινομένων αυτών (θετική ή αρνητική) στο QoS των δικτύων τρίτης γενιάς βάσει των χαρακτηριστικών τους (όπως παρουσιάστηκαν στο κεφάλαιο 1) και οι δυνατότητες για περαιτέρω βελτιστοποίηση κατα τον σχεδιασμό των δικτύων και την σωστή εκμετάλλευση των χαρακτηριστικών του περιβάλλοντος όδευσης. Ιδιαίτερη αναφορά γίνεται στα μοντέλα εσωτερικού χώρου λόγω του μεγάλου φορτίου κίνησης που καλούνται να εξυπηρετήσουν. Στο τελευταίο μέρος παρουσιάζεται η διαδικασία παραμετροποίησης κάποιων σημαντικών μοντέλων και τα αποτελέσματα των εξομοιώσεων που έγιναν στον χώρο του κτηρίου των Ηλεκτρολόγων Μηχανικών. / The subject of this diploma thesis is the study of the optimization techniques of the quality of service for third generation cellular telephony networks in fading enviroment. After a short presentation of the evolution of the systems of wireless telecommunications, it is discussed UMTS the most important third generation system which dominated the european market and its technical features. LTE is also introduced, the system which is expected to replace UMTS in the near future while being the predecessor of the fourth generation systems. Then we focus on the fading channels analysing the phenomena wich are related to them and analysing the statistical models that describe them. It is also studied the effect (positive or negative) of these phenomena on the QoS of the third generation networks and the optimization methods which can be applied during the network designing process with special reference to the indoor propagation models because of the big amount of traffic load that they are asked to serve. At the last chapter of the thesis there is a presentation of the parameter setting procedure for some important models and the outcomes of the simulation that took place in the building of Electronic Engineering.