5G: 2020 and Beyond

The future society would be ushered in a new communication era with the emergence of 5G. 5G would be significantly different, especially, in terms of architecture and operation in comparison with the previous communication generations (4G, 3G...). This book discusses the various aspects of the architecture, operation, possible challenges, and mechanisms to overcome them. Further, it supports users? interac- tion through communication devices relying on Human Bond Communication and COmmunication-NAvigation- SENsing- SErvices (CONASENSE).Topics broadly covered in this book are; • Wireless Innovative System for Dynamically Operating Mega Communications (WISDOM)• Millimeter Waves and Spectrum Management• Cyber Security• Device to Device Communicatio

5G: 2020 and Beyond

The future society would be ushered in a new communication era with the emergence of 5G. 5G would be significantly different, especially, in terms of architecture and operation in comparison with the previous communication generations (4G, 3G...). This book discusses the various aspects of the architecture, operation, possible challenges, and mechanisms to overcome them. Further, it supports users? interac- tion through communication devices relying on Human Bond Communication and COmmunication-NAvigation- SENsing- SErvices (CONASENSE).Topics broadly covered in this book are; • Wireless Innovative System for Dynamically Operating Mega Communications (WISDOM)• Millimeter Waves and Spectrum Management• Cyber Security• Device to Device Communicatio

Locative Histories: exploring the continued influence of early Locative Media Art

This paper, which draws on aspects of my doctoral research, traces the influence of early Locative Media Art on the current form and application of location-aware technologies. The mechanisms and impulse for this influence are introduced and analyzed and it is proposed that they point to new approaches in the consideration of the agency of Locative Media art. I return to the origins of Locative Media at the Karosta workshop and the ambitions of early practitioners to argue that the practice was based on a prescient analysis of the potential for ubiquitous networked location-awareness. From this analysis was developed an ambitious program aimed at repositioning emergent locative technologies as tools which enhance and augment space rather than surveil and control. It is demonstrated that Locative Media art projects have foreshadowed all of the key categories of current location-aware applications and services. This is not co-incidental but is, I suggest, the result of an intentional desire and associated actions to shift the meaning of these technologies. As location- awareness has become part of the everyday I advance that the forms it takes and the ways in which it is employed are co-constructed by Locative Media art practice and that this continued influence represents the agency of Locative Media Art. Drawing on Krzysztof Ziarek\u27s treatment of avant-garde art and technology in The Force of Art (2004), STS, software studies and their surrounding debates, I build an argument for this agency and explore the mechanism for this influence. While this influence is historical I contend that once its pathways are fully understood it can be sustained or renewed with future emergent technologies and propose that this approach offers new paths for the consideration of media art

A Decentralized Session Management Framework for Heterogeneous Ad-Hoc and Fixed Networks

Wireless technologies are continuously evolving. Second generation cellular networks have gained worldwide acceptance. Wireless LANs are commonly deployed in corporations or university campuses, and their diffusion in public hotspots is growing. Third generation cellular systems are yet to affirm everywhere; still, there is an impressive amount of research ongoing for deploying beyond 3G systems. These new wireless technologies combine the characteristics of WLAN based and cellular networks to provide increased bandwidth. The common direction where all the efforts in wireless technologies are headed is towards an IP-based communication. Telephony services have been the killer application for cellular systems; their evolution to packet-switched networks is a natural path. Effective IP telephony signaling protocols, such as the Session Initiation Protocol (SIP) and the H 323 protocol are needed to establish IP-based telephony sessions. However, IP telephony is just one service example of IP-based communication. IP-based multimedia sessions are expected to become popular and offer a wider range of communication capabilities than pure telephony. In order to conjoin the advances of the future wireless technologies with the potential of IP-based multimedia communication, the next step would be to obtain ubiquitous communication capabilities. According to this vision, people must be able to communicate also when no support from an infrastructured network is available, needed or desired. In order to achieve ubiquitous communication, end devices must integrate all the capabilities necessary for IP-based distributed and decentralized communication. Such capabilities are currently missing. For example, it is not possible to utilize native IP telephony signaling protocols in a totally decentralized way. This dissertation presents a solution for deploying the SIP protocol in a decentralized fashion without support of infrastructure servers. The proposed solution is mainly designed to fit the needs of decentralized mobile environments, and can be applied to small scale ad-hoc networks or also bigger networks with hundreds of nodes. A framework allowing discovery of SIP users in ad-hoc networks and the establishment of SIP sessions among them, in a fully distributed and secure way, is described and evaluated. Security support allows ad-hoc users to authenticate the sender of a message, and to verify the integrity of a received message. The distributed session management framework has been extended in order to achieve interoperability with the Internet, and the native Internet applications. With limited extensions to the SIP protocol, we have designed and experimentally validated a SIP gateway allowing SIP signaling between ad-hoc networks with private addressing space and native SIP applications in the Internet. The design is completed by an application level relay that permits instant messaging sessions to be established in heterogeneous environments. The resulting framework constitutes a flexible and effective approach for the pervasive deployment of real time applications.The invention of the phone has radically changed the way people communicate, as it allowed persons to get in contact instantly no matter of their location. However, phone communication has been confined for decades to a fixed location, be it one's own house or a phone boot. The widespread affirmation of cellular technologies has had for fixed telephony a similar impact that the invention of the phone has had on communications years before. With mobile phones, people are enabled to talk with each other anytime and anywhere. Internet has also revolutionized the way people communicate. E-mails have soon become one of the Internet killer applications. Later on, instant messaging, popularly known as chatting, has gained huge consensus among net surfers. Only recently, the use of the Internet for voice communication is becoming mainstream, and the so called Voice over IP (VoIP) applications (Skype is probably the most famous for the masses) are becoming common use. Despite its popularity, Internet still suffers from the inherent limitations that affected early telephony: it is fixed. The usage of Internet on the move still does not constitute the easiest and most satisfactory user experience, due to capabilities and limitations of the access technology, terminals, services and applications. Efforts for mobilizing the Internet are ongoing both in the industrial and in the academic worlds, but several bricks are needed to build the wall of mobile Internet. This dissertation provides one of these bricks, describing a solution that allows the deployment of multimedia applications (chat, VoIP, gaming) in mobile environments. In other words, this dissertation gives solutions for facilitating ubiquitous Internet-based communication, anytime and anywhere. The vision that we want to become true is that Internet must become mobile in the same way as fixed telephony has become mobile thanks to the cellular technology. More than this, we do not want that users are limited by the presence of an infrastructure to communicate with each other. In order to achieve this, we present solutions to deploy Internet-based services and applications in environments where no support from servers is available. In other words, we enable direct device-to-device, user-to-user Internet communication. Our contribution is mainly focused on the steps needed to establish the communication, the so called session establishment or signaling phase. We have validated our signaling framework by building a chat application that utilizes its features and works in server-less environments. The custom server-less solution does not prohibit to connect at the same time with the Internet, so that one can engage in a chess game using direct communication with a person in the proximity while having a chat in progress with a friend using standard Internet services. The challenge that we had to face is that Internet services and applications are usually built implying support from a centralized server. In order to deploy direct user-to-user Internet services, while maintaining interoperability with mainstream services, we had to enhance native Internet services to work without infrastructure support, without sacrificing interoperability with standard Internet applications. To conclude, we have placed our brick on the still yet to be completed wall of mobile Internet. Our hope is that one day, thanks also to this brick, everybody will be able to enjoy Internet-based applications as easily as now it is possible to use mobile telephony services

Design and implementation of a traffic control framework in Firefox OS

Today's smartphones include a rich feature-set as well as various wireless interfaces that provide extra services rather than just voice communication or messaging, as it occurred with traditional mobile phones. Additionally, the widespread use of mobile devices using Third Generation (3G) and Long Term Evolution (LTE) networks has led to the development of various applications (apps) that take advantage of the always-on Internet connectivity provided by these networks (e.g. instant messaging and social network services). Unlike traditional Internet apps (e.g. web surfing and file transfer), the emerging apps that rely on always-on connectivity are often constantly running in the background to receive messages and status updates. This behavior causes that apps continuously generate short app signaling messages such as keep-alive and ping requests to maintain the always-on connectivity. Although the traffic volume of keep-alive messages is not large, frequent short messages can incur a large amount of related signaling traffic in the mobile network. In 3G or LTE networks, the User Equipment (UE) and the Radio Access Network (RAN) keep the Radio Resource Control (RRC) states. The UE stays in Connected mode when it transmits or receives data during active periods and stays in Idle mode during inactive periods. To send even a small data packet, the UE changes the state to the Connected mode prior to transmission. This radio state change generates a lot of network signaling messages, resulting in a rapid increase in traffic loading. Large amounts of network signaling traffic leads to two major problems: rapid drainage of the mobile device's battery and a signaling traffic surge in the mobile network. Since the air interface is a spare resource and the traffic for mobile end devices will grow enormously, it is important that the wireless resources are used in the most efficient way. However, this is not true for current networks as there is not alignment between devices, apps and the network.This document proposes a traffic control framework which acts as an interface between the apps and the network and allows the network operator to aggregate packets prior to transmission. The aggregated packets are sent out at once after a configurable amount of time which means for instance that resources on the wireless link have to be reserved only once for a number of app signaling packets and not for each packet separately. By this the packet transmission will be bursty which will improve network efficiency as the amount of signaling messages is minimized. In addition, battery runtime is improved as lower signaling overhead will reduce the activity time and energy consumption within devices.Hoy en día los smartphones incorporan un amplio conjunto de utilidades, así como varias interfaces inalámbricas que proporcionan servicios adicionales a los ofrecidos por los teléfonos móviles convencionales. Por otra parte, el uso generalizado de las redes 3G y LTE ha originado el desarrollo de numerosas aplicaciones que aprovechan las ventajas que ofrecen dichas redes, un ejemplo son las aplicaciones de redes sociales. Estas aplicaciones, a diferencia de otras como la navegación web o la descarga de archivos, están constantemente ejecutándose en segundo plano y recibiendo notificaciones de actualización de estado. Este comportamiento propicia el intercambio de pequeños mensajes de señalización para mantener la conexión, tales como mensajes "keep alive" o "ping requests". A pesar de que el volumen de estos mensajes no es elevado, su constante intercambio puede ocasionar una gran cantidad de tráfico de señalización en la red. En las redes 3G o LTE, el equipo de usuario (UE) y la red de acceso radio terrestre (RAN) mantienen los estados RRC. El equipo de usuario permanece en el estado activo cuando transmite o recibe datos y retorna al estado de reposo durante los periodos inactivos. El envío de un pequeño paquete de datos supone la transición desde el estado de reposo al estado activo. Este comportamiento genera muchos mensajes de señalización e implica un rápido incremento en el tráfico de la red. Este incremento del tráfico de señalización ocasiona dos grandes problemas: la sobrecarga de la red y un impacto negativo en el consumo de batería de los dispositivos móviles. Es de vital importancia que se haga un uso eficiente de los recursos de red, ya que el aire, en este caso el canal de comunicación, es un medio compartido. Además, se espera que el tráfico generado por los dispositivos móviles crezca enormemente en los próximos años. Las redes móviles actuales no son utilizadas de un modo eficiente debido a la falta de interacción entre la red, los dispositivos móviles y las aplicaciones. Este documento presenta una plataforma de control de tr a co que actúa como interfaz entre las aplicaciones y la red, permitiendo al operador de red agregar los paquetes antes de su transmisión. Esto permite, por ejemplo, que los recursos de red sean reservados s olo una vez para la ráfaga de paquetes y no para cada paquete individualmente, lo cual minimiza la cantidad de mensajes de señalización. Esta propuesta no sólo ayuda a mejorar la eficiencia de la red, sino que además optimiza el uso de la batería, ya que una disminución del tráfico de señalización provoca una reducción del tiempo de actividad y consumo de energía de los dispositivos móviles.Ingeniería Telemátic

Positive expressive technologies for social wellness

This thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.Drawing on research from the fields of HCI, social and positive psychology, this thesis investigates the design of technologies that encourage the expression of positive emotions. In parallel, it details the deployment of effective design steps to guide, frame and eventually support understandings of positive mental and social usage effects of technology. Different artefacts termed PosiPost have been iteratively developed as exemplars for the discussion and exploration of the ways in which technologies can support positive communication and social sharing. Studies with these technologies have been conducted to explore how these can encourage positive communication and understand how they contribute to social wellness. Specifically, the studies undertaken validate the hypothesis that the sharing of positive emotions as mediated by technology has beneficial social and mental effects. The first stage of the research examined whether and how social technology can be designed for positive affect. A theoretical framework, named THE Medium model was developed to support the design process. Furthermore, design considerations were produced for technologies that encourage the sharing of positive emotions. This latter involved two studies, paper-based and online, which showed the potential for a prefixbased elicitation of positive emotions and drove the design and development of a mobile tool called PosiPost Me (Mobile edition). The second stage of the design process focused on how positive emotions can be mediated by technology in a mobile context and how such tools were used and understood. The iterative design study process continued, resulting in PosiPost Be, a Bluetooth edition, which allows sharing of positive messages with people in close proximity to explore the social and potential positive effects of contextualizing posiposting by adding location as a factor. Results suggest that by using a prefix-strategy, messages of a positive and mundane nature can be shared and mediated by mobile technology. Analysis of the shared messages provides insights into people’s pleasant moments in daily life. A questionnaire instrument named SPOT was developed and used for the measurement of the effects of sharing pleasant moments with the developed mobile expressive technologies in further detail. The results suggest that lightweight positive expressive technologies can have beneficial social wellness effects. In particular, the study showed significant beneficial effects in reducing depressed feelings and increasing social interest in others. Participants also believed that the mobile PosiPost applications supported social connectedness, socio-pleasure, social and positive awareness, and positive thinking

Energy Efficient and Cooperative Solutions for Next-Generation Wireless Networks

Energy efficiency is increasingly important for next-generation wireless systems due to the limited battery resources of mobile clients. While fourth generation cellular standards emphasize low client battery consumption, existing techniques do not explicitly focus on reducing power that is consumed when a client is actively communicating with the network. Based on high data rate demands of modern multimedia applications, active mode power consumption is expected to become a critical consideration for the development and deployment of future wireless technologies. Another reason for focusing more attention on energy efficient studies is given by the relatively slow progress in battery technology and the growing quality of service requirements of multimedia applications. The disproportion between demanded and available battery capacity is becoming especially significant for small-scale mobile client devices, where wireless power consumption dominates within the total device power budget. To compensate for this growing gap, aggressive improvements in all aspects of wireless system design are necessary. Recent work in this area indicates that joint link adaptation and resource allocation techniques optimizing energy efficient metrics can provide a considerable gain in client power consumption. Consequently, it is crucial to adapt state-of-the-art energy efficient approaches for practical use, as well as to illustrate the pros and cons associated with applying power-bandwidth optimization to improve client energy efficiency and develop insights for future research in this area. This constitutes the first objective of the present research. Together with energy efficiency, next-generation cellular technologies are emphasizing stronger support for heterogeneous multimedia applications. Since the integration of diverse services within a single radio platform is expected to result in higher operator profits and, at the same time, reduce network management expenses, intensive research efforts have been invested into design principles of such networks. However, as wireless resources are limited and shared by clients, service integration may become challenging. A key element in such systems is the packet scheduler, which typically helps ensure that the individual quality of service requirements of wireless clients are satisfied. In contrastingly different distributed wireless environments, random multiple access protocols are beginning to provide mechanisms for statistical quality of service assurance. However, there is currently a lack of comprehensive analytical frameworks which allow reliable control of the quality of service parameters for both cellular and local area networks. Providing such frameworks is therefore the second objective of this thesis. Additionally, the study addresses the simultaneous operation of a cellular and a local area network in spectrally intense metropolitan deployments and solves some related problems. Further improving the performance of battery-driven mobile clients, cooperative communications are sought as a promising and practical concept. In particular, they are capable of mitigating the negative effects of fading in a wireless channel and are thus expected to enhance next-generation cellular networks in terms of client spectral and energy efficiencies. At the cell edges or in areas missing any supportive relaying infrastructure, client-based cooperative techniques are becoming even more important. As such, a mobile client with poor channel quality may take advantage of neighboring clients which would relay data on its behalf. The key idea behind the concept of client relay is to provide flexible and distributed control over cooperative communications by the wireless clients themselves. By contrast to fully centralized control, this is expected to minimize overhead protocol signaling and hence ensure simpler implementation. Compared to infrastructure relay, client relay will also be cheaper to deploy. Developing the novel concept of client relay, proposing simple and feasible cooperation protocols, and analyzing the basic trade-offs behind client relay functionality become the third objective of this research. Envisioning the evolution of cellular technologies beyond their fourth generation, it appears important to study a wireless network capable of supporting machine-to-machine applications. Recent standardization documents cover a plethora of machine-to-machine use cases, as they also outline the respective technical requirements and features according to the application or network environment. As follows from this activity, a smart grid is one of the primary machine-to-machine use cases that involves meters autonomously reporting usage and alarm information to the grid infrastructure to help reduce operational cost, as well as regulate a customer's utility usage. The preliminary analysis of the reference smart grid scenario indicates weak system architecture components. For instance, the large population of machine-to-machine devices may connect nearly simultaneously to the wireless infrastructure and, consequently, suffer from excessive network entry delays. Another concern is the performance of cell-edge machine-to-machine devices with weak wireless links. Therefore, mitigating the above architecture vulnerabilities and improving the performance of future smart grid deployments is the fourth objective of this thesis. Summarizing, this thesis is generally aimed at the improvement of energy efficient properties of mobile devices in next-generation wireless networks. The related research also embraces a novel cooperation technique where clients may assist each other to increase per-client and network-wide performance. Applying the proposed solutions, the operation time of mobile clients without recharging may be increased dramatically. Our approach incorporates both analytical and simulation components to evaluate complex interactions between the studied objectives. It brings important conclusions about energy efficient and cooperative client behaviors, which is crucial for further development of wireless communications technologies

A Distributed Audit Trail for the Internet of Things

Sharing Internet of Things (IoT) data over open-data platforms and digital data marketplaces can reduce infrastructure investments, improve sustainability by reducing the required resources, and foster innovation. However, due to the inability to audit the authenticity, integrity, and quality of IoT data, third-party data consumers cannot assess the trustworthiness of received data. Therefore, it is challenging to use IoT data obtained from third parties for quality-relevant applications. To overcome this limitation, the IoT data must be auditable. Distributed Ledger Technology (DLT) is a promising approach for building auditable systems. However, the existing solutions do not integrate authenticity, integrity, data quality, and location into an all-encompassing auditable model and only focus on specific parts of auditability. This thesis aims to provide a distributed audit trail that makes the IoT auditable and enables sharing of IoT data between multiple organizations for quality relevant applications. Therefore, we designed and evaluated the Veritaa framework. The Veritaa framework comprises the Graph of Trust (GoT) as distributed audit trail and a DLT to immutably store the transactions that build the GoT. The contributions of this thesis are summarized as follows. First, we designed and evaluated the GoT a DLT-based Distributed Public Key Infrastructure (DPKI) with a signature store. Second, we designed a Distributed Calibration Certificate Infrastructure (DCCI) based on the GoT, which makes quality-relevant maintenance information of IoT devices auditable. Third, we designed an Auditable Positioning System (APS) to make positions in the IoT auditable. Finally, we designed an Location Verification System (LVS) to verify location claims and prevent physical layer attacks against the APS. All these components are integrated into the GoT and build the distributed audit trail. We implemented a real-world testbed to evaluate the proposed distributed audit trail. This testbed comprises several custom-built IoT devices connectable over Long Range Wide Area Network (LoRaWAN) or Long-Term Evolution Category M1 (LTE Cat M1), and a Bluetooth Low Energy (BLE)-based Angle of Arrival (AoA) positioning system. All these low-power devices can manage their identity and secure their data on the distributed audit trail using the IoT client of the Veritaa framework. The experiments suggest that a distributed audit trail is feasible and secure, and the low-power IoT devices are capable of performing the required cryptographic functions. Furthermore, the energy overhead introduced by making the IoT auditable is limited and reasonable for quality-relevant applications

Improving Access and Mental Health for Youth Through Virtual Models of Care

The overall objective of this research is to evaluate the use of a mobile health smartphone application (app) to improve the mental health of youth between the ages of 14–25 years, with symptoms of anxiety/depression. This project includes 115 youth who are accessing outpatient mental health services at one of three hospitals and two community agencies. The youth and care providers are using eHealth technology to enhance care. The technology uses mobile questionnaires to help promote self-assessment and track changes to support the plan of care. The technology also allows secure virtual treatment visits that youth can participate in through mobile devices. This longitudinal study uses participatory action research with mixed methods. The majority of participants identified themselves as Caucasian (66.9%). Expectedly, the demographics revealed that Anxiety Disorders and Mood Disorders were highly prevalent within the sample (71.9% and 67.5% respectively). Findings from the qualitative summary established that both staff and youth found the software and platform beneficial

The Impact of Digital Technologies on Public Health in Developed and Developing Countries

This open access book constitutes the refereed proceedings of the 18th International Conference on String Processing and Information Retrieval, ICOST 2020, held in Hammamet, Tunisia, in June 2020.* The 17 full papers and 23 short papers presented in this volume were carefully reviewed and selected from 49 submissions. They cover topics such as: IoT and AI solutions for e-health; biomedical and health informatics; behavior and activity monitoring; behavior and activity monitoring; and wellbeing technology. *This conference was held virtually due to the COVID-19 pandemic