Efficiency gains due to network function sharing in CDN-as-a-Service slicing scenarios

Proceedings of: IEEE 7th International Conference on Network Softwarization (NetSoft), 28 June-2 July 2021, Tokyo, Japan.The consumption of video contents is currently dominating the traffic observed in ISP networks. The distribution of that content is usually performed leveraging on CDN caches storing and delivering multimedia. The advent of virtualization is bringing attention to the CDN as use case for virtualizing the cache function. In parallel, there is a trend on sharing network infrastructures as a way of reducing deployment costs by ISPs. Then, an interesting scenario emerges when considering the possibility of sharing virtualized cache functions among ISPs sharing a common physical infrastructure, mostly considering that usually those ISPs offer similar content catalogues to final end users. This paper investigates through simulations the potential efficiencies that can be achieved when sharing a virtual cache function if compared to the classical approach of independent virtual caches operated per ISP.This work has been partly funded by the project 5GROWTH (Grant Agreement no. 856709)

Nas nuvens ou fora delas, eis a questão

Mestrado em Sistemas de InformaçãoO proposito desta dissertação é contribuir no sentido de uma melhor compreensão sobre a decisão de ir ou não ir para uma solução na cloud quando uma organização é confrontada com a necessidade de criar ou expandir um sistema de informação. Isto é feito recorrendo à identificação de factores técnicos e económicos que devem ser tomados em conta quando planeamos uma nova solução e desenvolver um framework para ajudar os decisores. Os seguintes aspetos são considerados: • Definição de um modelo de referência genérico para funcionalidades de um Sistemas de Informação. • Identificação de algumas métricas básicas para caracterizar performance e custos de Sistemas de Informação. • Analise e caracterização de Sistemas de Informação on-premises: Arquiteturas Elementos de custo Questões de Performance • Analise e caracterização de Sistemas de Informação Cloud: Topologias Estruturas de custo Questões de Performance • Estabelecimento de framework de comparação para a cloud versus on-premises • Casos de uso comparando soluções na cloud e on-premises; • Produção de guidelines (focadas no caso das clouds publicas) Para ilustrar o procedimento, são usados dois business cases, ambos com duas abordagens: uma dedicada aos Profissionais de IT (abordagem técnica), outra aos Gestores/Decisores (abordagem económica).The purpose of this dissertation is to contribute towards a better understanding about the decision to go or not to go for cloud solutions when an organization is confronted with the need to create or enlarge an information system. This is done resorting to the identification of technical and economic factors that must be taken into account when planning a new solution and developing a framework to help decision makers. The following aspects are considered: • Definition of a generic reference model for Information systems functionalities. • Identification of some basic metrics characterizing information systems performance. • Analysis and characterization of on-premisis information systems: Architectures Cost elements Performance issues • Analysis and characetrization of cloud information systems. Typology Cost structures Performance issues • Establishment of a comparison framework for cloud versus on-premises solutions as possible instances of information systems. • Use cases comparing cloud and on-premises solutions. • Production of guidelines (focus on public cloud case) To illustrate the procedure, two business cases are used, both with two approaches: one dedicated to IT Professionals (Technical approach), other to Managers/Decision Makers (Economic approach)

Progressive introduction of network softwarization in operational telecom networks: advances at architectural, service and transport levels

Technological paradigms such as Software Defined Networking, Network Function Virtualization and Network Slicing are altogether offering new ways of providing services. This process is widely known as Network Softwarization, where traditional operational networks adopt capabilities and mechanisms inherit form the computing world, such as programmability, virtualization and multi-tenancy. This adoption brings a number of challenges, both from the technological and operational perspectives. On the other hand, they provide an unprecedented flexibility opening opportunities to developing new services and new ways of exploiting and consuming telecom networks. This Thesis first overviews the implications of the progressive introduction of network softwarization in operational networks for later on detail some advances at different levels, namely architectural, service and transport levels. It is done through specific exemplary use cases and evolution scenarios, with the goal of illustrating both new possibilities and existing gaps for the ongoing transition towards an advanced future mode of operation. This is performed from the perspective of a telecom operator, paying special attention on how to integrate all these paradigms into operational networks for assisting on their evolution targeting new, more sophisticated service demands.Programa de Doctorado en Ingeniería Telemática por la Universidad Carlos III de MadridPresidente: Eduardo Juan Jacob Taquet.- Secretario: Francisco Valera Pintor.- Vocal: Jorge López Vizcaín

QoE management of multimedia streaming services in future networks : a tutorial and survey

No embargo require

Netflix nations: the geography of digital distribution

How streaming services and internet distribution have transformed global television culture. Television, once a broadcast medium, now also travels through our telephone lines, fiber optic cables, and wireless networks. It is delivered to viewers via apps, screens large and small, and media players of all kinds. In this unfamiliar environment, new global giants of television distribution are emerging-including Netflix, the world's largest subscription video-on-demand service. Combining media industry analysis with cultural theory, Ramon Lobato explores the political and policy tensions at the heart of the digital distribution revolution, tracing their longer history through our evolving understanding of media globalization. Netflix Nations considers the ways that subscription video-on-demand services, but most of all Netflix, have irrevocably changed the circulation of media content. It tells the story of how a global video portal interacts with national audiences, markets, and institutions, and what this means for how we understand global media in the internet age. Netflix Nations addresses a fundamental tension in the digital media landscape - the clash between the internet's capacity for global distribution and the territorial nature of media trade, taste, and regulation. The book also explores the failures and frictions of video-on-demand as experienced by audiences. The actual experience of using video platforms is full of subtle reminders of market boundaries and exclusions: platforms are geo-blocked for out-of-region users ("this video is not available in your region"); catalogs shrink and expand from country to country; prices appear in different currencies; and subtitles and captions are not available in local languages. These conditions offer rich insight for understanding the actual geographies of digital media distribution. Contrary to popular belief, the story of Netflix is not just an American one. From Argentina to Australia, Netflix's ascension from a Silicon Valley start-up to an international television service has transformed media consumption on a global scale. Netflix Nations will help readers make sense of a complex, ever-shifting streaming media environment

Video Caching, Analytics and Delivery at the Wireless Edge: A Survey and Future Directions

Future wireless networks will provide high bandwidth, low-latency, and ultra-reliable Internet connectivity to meet the requirements of different applications, ranging from mobile broadband to the Internet of Things. To this aim, mobile edge caching, computing, and communication (edge-C3) have emerged to bring network resources (i.e., bandwidth, storage, and computing) closer to end users. Edge-C3 allows improving the network resource utilization as well as the quality of experience (QoE) of end users. Recently, several video-oriented mobile applications (e.g., live content sharing, gaming, and augmented reality) have leveraged edge-C3 in diverse scenarios involving video streaming in both the downlink and the uplink. Hence, a large number of recent works have studied the implications of video analysis and streaming through edge-C3. This article presents an in-depth survey on video edge-C3 challenges and state-of-the-art solutions in next-generation wireless and mobile networks. Specifically, it includes: a tutorial on video streaming in mobile networks (e.g., video encoding and adaptive bitrate streaming); an overview of mobile network architectures, enabling technologies, and applications for video edge-C3; video edge computing and analytics in uplink scenarios (e.g., architectures, analytics, and applications); and video edge caching, computing and communication methods in downlink scenarios (e.g., collaborative, popularity-based, and context-aware). A new taxonomy for video edge-C3 is proposed and the major contributions of recent studies are first highlighted and then systematically compared. Finally, several open problems and key challenges for future research are outlined