VoLTE service implementation in EPS-IMS networks

Diplomová práce popisuje VoLTE službu, vývoj a nasazení LTE (zaváděcí fázi, skutečný LTE stav a výhledy do budoucna atd.), EPC-IMS architekturu (popis funkce uzlu, rozhraní atd.) Komunikace mezi uzly a funkce, rozhraní a protokoly jsou používány v průběhu signalizace (SIP SDP) a datový tok (RTCP RTP). Práce stručně popisuje základní toky hovorů, typy nosičů (GBR and N-GBR), a to vytvoření / mazaní nosičů během komunikace. Další část diplomové práce o implementaci volte, instalace a konfigurace IMS. Závěrečná část diplomové práce popisuje zkoušky sítě a, analýzu protokolu.The master's thesis describes VoLTE service, LTE evolution and deployment (deployment phases, actual LTE state and future perspectives etc.), EPC-IMS architecture (functional node description, interfaces etc.). Communications between nodes and functions, interfaces and protocols which are used during signaling (SIP-SDP) and data flow (RTCP RTP). Thesis briefly describe basic call flows, bearers types (GBR and N-GBR) and their establishment/delete during communication. The next part of master's thesis is about VoLTE implementation solutions, IMS installation and configuration. The final part of master's thesis describes the network and protocols tests, analyzes.

Robust Controller for Delays and Packet Dropout Avoidance in Solar-Power Wireless Network

Solar Wireless Networked Control Systems (SWNCS) are a style of distributed control systems where sensors, actuators, and controllers are interconnected via a wireless communication network. This system setup has the benefit of low cost, flexibility, low weight, no wiring and simplicity of system diagnoses and maintenance. However, it also unavoidably calls some wireless network time delays and packet dropout into the design procedure. Solar lighting system offers a clean environment, therefore able to continue for a long period. SWNCS also offers multi Service infrastructure solution for both developed and undeveloped countries. The system provides wireless controller lighting, wireless communications network (WI-FI/WIMAX), CCTV surveillance, and wireless sensor for weather measurement which are all powered by solar energy

Cross-layer analysis for video transmission over COFDM-based wireless local area networks

EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Living in virtual communities : an ethnography of life online

This thesis examines some of the issues involved in the development of human relationships in cyberspace. Set within the wider context of the Internet and society it investigates how geographically distant individuals are coming together on the Internet to inhabit new kinds of social spaces or virtual communities. People 'live in' and 'construct' these new spaces in such a way as to suggest that the Internet is not a placeless cyberspace that is distinct and separate from the real world. Building on the work of other cyberethnographers, I combine original ethnographic research in Cybertown (http: /www. cybertown. com), a Virtual Community, with face-to-face meetings to illustrate how, for many people, cyberspace is just another place to meet. Secondly I suggest that people in Cybertown are investing as much effort in maintaining relationships in cyberspace as in other social spaces. By extending traditional human relationships into Cybertown, they are widening their webs of relationships, not weakening them. Human relationships in cyberspace are formed and maintained in similar ways to those in wider society. Rather than being exotic and removed from real life, they are actually being assimilated into everyday life. Furthermore they are often moved into other social settings, just as they are in offline life

Demanda latente e implicações da internet banda larga móvel nas empresas

Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-graduação em Engenharia de Produção.Este trabalho explica a Demanda Latente e Implicações da Internet Banda Larga Móvel nas Empresas. Propõe um modelo estatístico que explique os fatores que mais influenciam para a adoção da Internet móvel pelas indústrias exportadoras. Procura antecipar-se na medida em que, as atenções do setor de telecomunicações se ocupam em tentar compreender as complexas dimensões dos impactos resultantes da convergência das indústrias de Tecnologia da Informação, Mídia e de Telecomunicações na sociedade. Avalia com ênfase o panorama em que, por meio da rápida evolução tecnológica e suas novas aplicações, um novo perfil de consumidor, mais habituado a buscar tudo na rede e cujas preferências mudam constantemente, passa a exigir uma nova postura empresarial. Projeta cenários e os examina à luz do modelo estatístico resultante, de modo a oferecer uma visão dimensional estruturada dos impactos da Internet móvel sobre as empresas exportadoras. Constata associação positiva entre a demanda por internet móvel e aspectos relacionados ao uso de tecnologias móveis, à convergência, à competitividade, e aos de aprimoramento mais integral das relações empresariais, num panorama de mercado globalizado, cujos parâmetros desafiam as atuais crenças e premissas

A structurational approach to the use of virtual learning environments in multicultural contexts

A gap in the E-learning literature suggests that attempts to realize research into the design of learning technologies that are conducive to user modification and that support a global set of learners, are still fraught with numerous problems directly relating to the dichotomous view of “culture”, “technology” and “pedagogy”. The dichotomies are mainly between determinism and anti-determinism. With regard to culture, determinists believe that “national culture” acts on everyone who shares the same physical and social environment, and it ignores diversity within cultural groups. On the contrary, seeing culture in terms of context and meaning, anti-determinists argue that people develop concepts, names and shared understanding and meanings linked to their actions and behaviour. They argue that individuals can act independently of their situated cultural contexts, and this provides a basis for intracultural diversity. Concerning pedagogy, determinists believe that knowledge is transferred from teacher to students and that instructions change students’ behaviour in obvious and measurable ways. In contrast, anti-determinists believe that learning is constructed based on learners’ understanding of the world and on their reflection and experiences. As such, results of learning are not easily measured and may not be the same for each learner. As it pertains to technology, determinists believe that the technology, such as the VLE, determines how learning will take place based on a didactic approach. Conversely, an anti-deterministic view is that social actions shape the technology to construct meaning and knowledge. Altogether, dichotomies present only a partial view of reality. Anthony Giddens’ [1984] Theory of Structuration overcomes these dichotomies. Therefore, the theory was used to develop a Structuration Conceptual and Theoretical Framework [SCTF] to guide the empirical study of VLE use in multicultural settings. The theory was adapted to reflect the duality of technological, cultural and educational models of structure and agency, as well as the resulting conflicts. An interpretive qualitative case study was conducted, involving thirty-two semi-structured interviews with students [n=23] and lecturers [n=9] who used Blackboard and CABWEB VLEs for assessed and non-assessed activities. The results drew out main issues relating to VLE-supported pedagogy in multicultural contexts for staff and students; their expectations and perceptions of VLE; their overall pedagogical activities and VLE usage; and the technological, cultural/social and pedagogical issues that arose. Following an analysis of the results, it was discovered that the SCT framework needed to be modified to incorporate a cycle of processes and structurational transformations which occurred in the multicultural setting. This modification led to a richer model of Structuration – SCTF2 – which differs from, but enhances Giddens’ model. Contributions of the study lie in the updated Structuration Conceptual and Theoretical Framework – SCTF2. As a contribution to theory, SCTF2 has developed a specific version of Structuration for Culture, Pedagogy and Technology, and has suggested enhancements to Giddens’ Theory of Structuration. The SCTF2 model uses a cycle of arrows to portray a chronological sequence of processes such as individual action, interaction, conflict, reflexivity and the development and transformation of new structures. SCTF2 emphasizes the crucial role which conflict and reflexivity played in the development of new structures and in the understanding of how and why such structures were produced overtime. The model also highlights that structures of signification, legitimation and domination all overlapped and that each of these structures incorporated all three phenomena of culture, technology and pedagogy. Contributions to the methodology and practice of technology-enhanced learning in multicultural contexts are also discussed. This new framework can help to understand cultural issues surrounding the use of the VLE. It could guide the application and adoption of VLEs by staff and students in multicultural settings