Video Quality Measurement for 3G Handset

The quality of video has become a decisive factor for the consumer of 3G video services to choose his mobile operator. It is, therefore, critical for 3G network operator, equipment provider and service provider to measure and hence maintain the video quality of video services they offer. A project has been proposed in University of Plymouth to develop a test platform to evaluate video quality for 3G handset using Asterisk PBX server. For this purpose, support for 3G-324M protocol and all the audio and video codecs (i.e. H.263 baseline level 10 and MPEG-4 simple profile @ level 0) mandated and recommended by 3G- 324M standard should be added in to Asterisk®. The purpose of this thesis is to identify the correct software implementation of H.263 baseline level 10 and MEPG-4 simple profile @ level 0 video codecs so that they can then be incorporated in to Asterisk®. This is the part of the above mentioned project. Open source FFmpeg-libavcodec is believed to support both MPEG-4 and H.263 codecs. Similarly Telenor H.263 codec is also free to use. This project tests both the capabilities and suitability of the above mentioned software packages/codecs for adding in to Asterisk to perform the required encoding and decoding. Experiments showed that FFmpeg-libavcodec can neither decode nor encode to MPEG-4 simple profile @ level 0. It seems that FFmpeg requires some major modifications in its source code to support MPEG-4 simple profile @ level 0 codec. Although FFmepg can decode and encode to H.263 baseline level 10, but it does not offer a fine control over bitrate while encoding, and reports very high muxing overhead while decoding, H.263 baseline level 10. Telenor H.263 codec can decode and encode to H.263 baseline level 10.without any problem. Telenor H.263 codec is, therefore, more suitable for incorporating in to Asterisk® than FFmpeg for decoding and encoding to H.263 baseline level 10 bitstreams. ISchool of Computing, Communication and Electronic

Video Quality Measurement For 3G Handsets

Internet provides many services. VOIP (Voice over IP) is one such service also known as Internet Telephony or IP Telephony. Using VOIP we can make voice telephony calls, participate in video conferences, etc over data networks (WAN'S and LAN'S) or internet. VOIP operates by first converting voice data into digital form, organizing them into packets, transmitting them through the most convenient route to their destination and finally reassembling them at the destination. Protocols like SIP/RTP, H.323, MGCP are designed which perform all the above steps. This project aims to make a video call from a 3G Mobile to an IP phone via Asterisk Gateway. Asterisk to act as bridge for video call between 3G-IP network must capture the audio/video stream from 3G mobile, convert captured stream into an IP compatible stream and send stream to an IP client and vice-versa. Asterisk needs to support AMR codec for audio and MPEG-4 codec for video and H.324M protocol stack for capturing audio/video streams from 3G Mobile. Asterisk currently supports audio codec's like GSM, G.729, A-law, and U-law. It allows H.261, H.263 video streams as pass-through. It supports VOIP protocols like SIP/RTP, MGCP, and H.323 which allows it to interface with other devices. This project aims to implement AMR codec, H.324M protocol stack, MPEG-4, bridging functions between SIP/RTP-ISDN and 3G Mobile in Asterisk which allows a 3G phone to call a SIP client via Asterisk. This thesis discusses the implementation of AMR in asterisk as well as SIP protocol and SIP soft phones

A criação de redes de próxima geração IMS usando produtos Open Source

Estágio realizado na PT InovaçãoTese de mestrado integrado. Engenharia Electrotécnica e de Computadores. Faculdade de Engenharia. Universidade do Porto. 200

The effects of network factors on the performance of 3G UMTS applications

Includes bibliographical references (leaves 139-148).3G is the wireless network technology expected to allow wireless applications to perform on par with wired applications. However 3G has factors which limit its performance. These factors include both device factors such as small screens, limited battery power and life, as well as network factors such as high delay networks and low bandwidths. This thesis investigates the following: how network factors affect the performance of 3G UMTS applications; which network factors have the most significant impact on a specific application; whether there are any minimum requirements needed for an application. Eight popular 3G applications were investigated: FTP, email, MMS, SMS, HTTP web browsing, broadcast media, video calling and streaming media

Multimedia in mobile networks: Streaming techniques, optimization and User Experience

1.UMTS overview and User Experience 2.Streaming Service & Streaming Platform 3.Quality of Service 4.Mpeg-4 5.Test Methodology & testing architecture 6.Conclusion

Adaptive network abstraction layer packetization for low bit rate H.264/AVC video transmission over wireless mobile networks under cross layer optimization

Master'sMASTER OF ENGINEERIN

Evaluating the effectiveness of mobile telecommunication services in Durban and Lagos.

Thesis (M.Com.)-University of KwaZulu-Natal, Westville, 2011.Telecommunication includes voice, video and internet communication services. Thus, mobile telecommunication services involve voice communication, video streaming, graphics and television services at high speed. Technology development in mobile telecommunication has enabled users to exchange data using cell phones, laptops and other telecommunication devices. More so, understanding the concept of user experience is very important in the context of provision of mobile telecommunication services. This research will evaluate the effectiveness of mobile telecommunication services in Durban, South Africa and Lagos, Nigeria amongst first-year IT students of the University of KwaZulu-Natal and Lagos State University. The research is focused on the actual experience and perceptions of first-year IT students. The study will examine the factors that influence first-year IT students' judgment of the quality of mobile telecommunication services. It will also access the impact of quality of mobile telecommunication services on the loyalty of first-year IT students towards their network operator. However, Technology Acceptance Model (TAM) is the theory adopted for this research, which explains how attitude of users determine the intention to use technology and the intention eventually influences the overall use of such technology. The objectives of this research highlight opportunities associated with understanding first-year IT students' experiences and perceptions of mobile telecommunication services in UKZN, Durban and LASU, Lagos. Other opportunities include giving an insight into the operations of network providers, determine the quality of mobile telecommunication services and understanding the impact of mobile telecommunication services on students in UKZN and LASU. Another significance of this study allows network providers to understand students' behaviour and to respond to their preferences

Analysis of the security mechanism in the IMS architecture

Orientador: Yuzo IanoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de ComputaçãoResumo: Considerando-se que para controlar e possibilitar a entrega de diversos conteúdos e serviços a qualquer tipo de acesso fazia-se necessário um núcleo bem definido e estruturado, surgiu o IMS (IP Multimedia Subsystem) com o propósito de prover a integração completa das redes e serviços. O IMS define uma arquitetura completa e framework que habilita a convergência de voz, vídeo, dados e tecnologia de rede móvel através de uma infraestrutura baseada em IP, preenchendo a distância entre os dois paradigmas de comunicação mais bem sucedidos, celular e tecnologia IP. Este trabalho apresenta a arquitetura IMS como controle central de todas as redes, e uma arquitetura para o desenvolvimento de aplicações móveis que incorporem voz, vídeo e dados. A arquitetura IMS apesar de promissora apresenta inúmeras oportunidades de melhoria no seu mecanismo de segurança, muitas dessas oportunidades de melhoria estão relacionadas a falhas e até mesmo a falta de especificações de segurança quando a arquitetura foi originalmente implementada. Assim o maior desafio na implantação e globalização da arquitetura IMS são as falhas de segurança e a vulnerabilidade que a arquitetura possui a diversos tipos de ataques que podem atingir e prejudicar, tanto operadoras quanto usuários da rede. O objetivo deste projeto de pesquisa é apresentar uma análise detalhada sobre a estrutura da arquitetura IMS focando principalmente na arquitetura de segurança desenvolvida pela 3GPP, e assim prover análises e soluções para os ataques, vulnerabilidades e falhas de segurança que atingem a arquitetura tanto do ponto de vista de operadoras e provedores de serviço quanto na perspectiva do usuárioAbstract: Considering that to control and enable the delivery of diverse content and services to any type of access it should make necessary a core well-defined and structuralized, appeared the IMS (IP Multimedia Subsystem) in order to provide the complete integration of networks and services. IMS defines a complete architecture and framework that enables the convergence of voice, video, data and mobile network technology over an infrastructure based on IP, in addition to filling the gap between the two communications paradigms most successful, cellular and IP technology. This paper presents the IMS architecture as central control of all networks, and architecture for developing mobile applications that incorporate voice, video and data. The IMS architecture despite being promising presents numerous opportunities for improvement in its security mechanism, many of these opportunities for improvement are related to failures and even the lack of security specifications when creating the architecture. So the biggest challenge in the implementation of the IMS architecture and globalization are the security issues and vulnerabilities that the architecture faces being vulnerable to several types of attacks that can reach and affect carriers and network users. The objective of this research project is to present a detailed analysis on the structure of the IMS architecture focusing primarily on security architecture developed by 3GPP, and thus provide analysis and solutions about the attacks, vulnerabilities and security issues that affect the architecture from the point of view of carriers, service providers and from the network usersMestradoTelecomunicações e TelemáticaMestre em Engenharia Elétric

Text and mimesis : reconfiguring technology and adult learning

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