Dynamic bandwidth allocation with SLA awareness for QoS in ethernet passive optical networks

Quality-of-service (QoS) support in Ethernet passive optical networks is a crucial concern. We propose a new dynamic bandwidth allocation (DBA) algorithm for service differentiation that meets the service-level agreements (SLAs) of the users. The proposed delay-aware (DA) online DBA algorithm provides constant and predictable average packet delay and reduced delay variation for the high-and medium-priority traffic while keeping the packet loss rate under check. We prove the effectiveness of the proposed algorithm by exhaustive simulations

IMPACTO Y MASIFICACION DEL USO DE LAS REDES GPON EN COLOMBIA FRENTE A OTRAS TECNOLOGIAS

En este artículo hace mención a  las ventajas que posee el realizar transmisión de datos por medio de fibra óptica a través de GPON. Esta por ser una tecnología de última generación, ha permitido que servicios como televisión en alta definición, streaming y aplicaciones multimediales lleguen a los usuarios sin interferencias, ni retrasos marcados; también se pretenden dar a conocer las características de las tecnologías GPON que se están implementando en Colombia con el fin de poder brindar acceso a servicios convergentes

Energy Efficient Network Function Virtualisation in 5G Networks

Once the dust settled around 4G, 5G mobile networks become the buzz word in the world of communication systems. The recent surge of bandwidth-greedy applications and the proliferation of smart phones and other wireless connected devices has led to an enormous increase in mobile traffic. Therefore, 5G networks have to deal with a huge number of connected devices of different types and applications, including devices running life-critical applications, and facilitate access to mobile resources easily. Therefore given the increase in traffic and number of connected devices, intelligent and energy efficient architectures are needed to adequately and sustainably meet these requirements. In this thesis network function virtualisation is investigated as a promising paradigm that can contribute to energy consumption reduction in 5G networks. The work carried out in this thesis considers the energy efficiency mainly in terms of processing power consumption and network power consumption. Furthermore, it considers the energy consumption reduction that can be achieved by optimising the locations of virtual machines running the mobile 5G network functions. It also evaluates the consolidation and pooling of the mobile resources. A framework was introduced to virtualise the mobile core network functions and baseband processing functions. Mixed integer linear programming optimisation models and heuristics were developed minimise the total power consumption. The impact of virtualisation in the 5G front haul and back haul passive optical network was investigated by developing MILP models to optimise the location of virtual machines. A further consideration is caching the contents close to the user and its impact on the total power consumption. The impact of a number of factor on the power consumption were investigated such as the total number of active users, the backhaul to the fronthaul traffic ratio, reduction/expansion in the traffic due to baseband processing, and the communication between virtual machines. Finally, the integration of network function virtualisation and content caching were introduced and their impact on improving the energy efficiency was investigated

Fibra óptica na rede de acesso: cenários de evolução

Mestrado em Engenharia Electrónica e TelecomunicaçõesCom o aumento da necessidade dos consumidores disporem de uma crescente largura de banda, em virtude dos serviços serem tecnologicamente mais avançados, a procura de novas soluções para redes de acesso de fibra óptica cresce. A nova geração de redes de acesso (NGA: Next Generation Access Networks) vai permitir a implementação de aplicações já existentes e fornecer uma maior largura de banda que será capaz de abrir novos horizontes a nível dos serviços, oferecendo uma qualidade de serviço superior e uma redução de degradações como a latência ou a taxa de contenção. Ao dimensionar redes de acesso de fibra óptica é imperativo ponderar os aspectos práticos das suas implementações: opções arquitecturais, limitações de desempenho de equipamentos nos diferentes segmentos da rede, planos de instalação e até mesmo o comportamento dos mercados. Sendo assim, é preciso continuar o processo de evolução e descobrir novas soluções que permitam superar estas limitações. Para que isso seja possível será aqui apresentado um estudo que pretende indicar possíveis caminhos para a próxima geração de redes combatendo as limitações das arquitecturas actuais tentando obter uma direcção para os próximos anos. Esta dissertação foi desenvolvida com o objectivo de analisar a organização e a estrutura das actuais redes de telecomunicações, as suas tecnologias, arquitecturas e soluções de rede, adoptando potenciais cenários de evolução que utilizam a fibra óptica como meio físico de transmissão.With the increasing need for consumers to benefit from an increased bandwidth, in virtue of the services being technologically more advanced, the demand of new solutions for access networks grows. The Next Generation Access Networks will allow the implementation of existing applications and provide a higher bandwidth that will be able to open new horizons for services by offering a quality of service and a reduction of degradations such as latency or contention rate. When dimensioning an access network is imperative to consider the practicalities of their implementation: architectural options, performance limitations of equipment, design plans and even the market’s behavior. Therefore, we must continue to progress in finding new solutions to address these issues. To make this possible, a study of next-generation networks will be presented here, presenting the options available to tackle the existing constraints and to try to get a direction for the following years. This project was developed in order to analyze the organization and structure of the current telecommunications networks, their technologies, architectures and solutions, considering potential growth scenarios that use optical fiber as the physical transmission medium