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

Impact of Mobility and Wireless Channel on the Performance of Wireless Networks

This thesis studies the impact of mobility and wireless channel characteristics, i. e. , variability and high bit-error-rate, on the performance of integrated voice and data wireless systems from network, transport protocol and application perspectives. From the network perspective, we study the impact of user mobility on radio resource allocation. The goal is to design resource allocation mechanisms that provide seamless mobility for voice calls while being fair to data calls. In particular, we develop a distributed admission control for a general integrated voice and data wireless system. We model the number of active calls in a cell of the network as a Gaussian process with time-dependent mean and variance. The Gaussian model is updated periodically using the information obtained from neighboring cells about their load conditions. We show that the proposed scheme guarantees a prespecified dropping probability for voice calls while being fair to data calls. Furthermore, the scheme is stable, insensitive to user mobility process and robust to load variations. From the transport protocol perspective, we study the impact of wireless channel variations and rate scheduling on the performance of elastic data traffic carried by TCP. We explore cross-layer optimization of the rate adaptation feature of cellular networks to optimize TCP throughput. We propose a TCP-aware scheduler that switches between two rates as a function of TCP sending rate. We develop a fluid model of the steady-state TCP behavior for such a system and derive analytical expressions for TCP throughput that explicitly account for rate variability as well as the dependency between the scheduler and TCP. The model is used to choose RF layer parameters that, in conjunction with the TCP-aware scheduler, improve long-term TCP throughput in wireless networks. A distinctive feature of our model is its ability to capture variability of round-trip-time, channel rate and packet error probability inherent to wireless communications. From the application perspective, we study the performance of wireless messaging systems. Two popular wireless applications, the short messaging service and multimedia messaging service are considered. We develop a mathematical model to evaluate the performance of these systems taking into consideration the fact that each message tolerates only a limited amount of waiting time in the system. Using the model, closed-form expressions for critical performance parameters such as message loss, message delay and expiry probability are derived. Furthermore, a simple algorithm is presented to find the optimal temporary storage size that minimizes message delay for a given set of system parameters

WHAT DO USERS NEED? EXPLORING INFLUENCES ON THE ADOPTION OF MOBILE CONTENT AND THE DIFFERENCES AMONG CATEGORIES OF ADOPTERS

Businesses develop products and services with the goal of earning a satisfactory return on their original investment of time and capital. For their part, consumers seek out products and services that meet a recognized need. However, predicting the adoption rate of any new technology is an inexact science, and some businesses find themselves on the wrong side of the curve. The variables factoring into consumers’ purchasing decisions are manifold and contingent on a wider network of influences. This research suggests that a primary variable that influences consumers’ adoption of a technological innovation (in this case, mobile content) is the perception of 10 proposed Mobile Content Needs. The first goal of this research is to propose a framework for the relationships among the adoption of mobile content, users’ perception of their need for mobile content, and users’ innovativeness, which is a measure of the likelihood to adopt a new product. This research seeks to explore the differences among groups (categories) of adopters in the context of the perceived needs influencing their decision to adopt mobile content. In other words, it examines the prominence of particular mobile content needs for each of the five categories of adopters. This examination provides indirect evidence of how the mobile content adoption process evolves over time in relation to a specific innovation and within specific groups. This research is useful for those seeking to better understand the mobile content market in its totality, in particular the motivations driving different adopter groups. The results of this research may enable the development of more relevant, targeted content, with a surer knowledge of what a potential consumer needs at each stage of the adoption lifecycle. Similarly, this research offers a foundation for more extensive studies in the near future

Architecture and Remote Interaction Techniques for Digital Media Exchange across 3G Mobile Devices

For users away from the office or home, there is an increasing demand for mobile solutions that offer effective collaborative facilities on the move. The mobile cellular device, or “smart phone”, can offer a ubiquitous platform to deliver such services, provided that its many physical and technological constraints can be overcome. In an effort to better support mobile collaboration, this thesis presents a contributing Mobile Exchange Architecture (MEA) designed to improve upon the capabilities provided by mobile devices to enable synchronous exchange of digital media during a phone conversation using wireless networks and cellular devices. This research includes the design and development of one such MEA in the form of a fully functional Photo-conferencing service, supporting shared remote interaction techniques, simultaneous voice communication and seamless digital media exchange between remote and collocated mobile users. Furthermore, through systematic design, experimental evaluations and field studies we evaluate the effects of different shared remote interaction techniques – 'pointing', 'scaling', 'mixed' and 'hybrid' – assessing the task effort required by users when interacting around shared images across resource constrained mobile devices. This thesis presents a direction for the future development of technologies and methods to enable a new era of scalable always-to-hand mobile collaborative environments.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Experiencias metodológicas para la gestión del riesgo 

Es ante todo una obra de enseñanza, demostración y progreso sobre temas que transitan desde los modelos para gestionar el riesgo costero, hasta los de educación ambiental para la gestión integrada de riesgos, la socialización en comunidades para la mitigación y prevención de desastres, contribución de la telefonía móvil en los Sistemas de Alertas Tempranas, así como las diferentes soluciones ingenieras, necesarias para una adecuada gestión del riesgo. Desde la página primera hasta la última, el libro prepara a los lectores en la búsqueda y actualización constante de otras importantes fuentes bibliográficas y casos de estudios sobre los temas abordados, los cuales han sido descritos y citados en sus diez capítulos.It is above all a work of teaching, demonstration and progress on topics that go from models to manage coastal risk, to environmental education for integrated risk management, socialization in communities for mitigation and disaster prevention, contribution of the mobile telephony in the Early Warning Systems, as well as the different engineering solutions, necessary for an adequate risk management. From the first to the last page, the book prepares readers to search and constantly update other important bibliographic sources and case studies on the topics addressed, which have been described and cited in its ten chapters