QUALITY OF SERVICE ARCHITECTURES APPLICABILITY IN AN INTRANET NETWORK

The quality of service (QoS) concept, which appeared initially as a necessity to improve Internet users perception, deals actually with new valences along with information society maturation. At the organisation’s level, the Intranet network shall assure in a similar manner as the Internet all kinds of services, which are useful to the organisation’s users. Starting from the traditional QoS architectural models, network administrators shall plan and design a QoS architecture, which will map on the organisation’s requirements, having at disposal not only own network elements but also communication services provided by other operators. The aim of this paper is to present, starting from the general QoS models, a comparative study of main advantages and drawbacks in implementing a specific Intranet QoS architecture taking into consideration all kind of aspects (material, financial, human resources), which impact on a good Intranet QoS management.QoS, IntServ, DiffServ, IntServ over DiffServ, VPN-MPLS, Intranet network

Pre-Congestion Notification (PCN) Architecture

This document describes a general architecture for flow admission and termination based on pre-congestion information in order to protect the quality of service of established, inelastic flows within a single Diffserv domain.\u

Real-life performance of protocol combinations for wireless sensor networks

Wireless sensor networks today are used for many and diverse applications like nature monitoring, or process and wireless building automation. However, due to the limited access to large testbeds and the lack of benchmarking standards, the real-life evaluation of network protocols and their combinations remains mostly unaddressed in current literature. To shed further light upon this matter, this paper presents a thorough experimental performance analysis of six protocol combinations for TinyOS. During these protocol assessments, our research showed that the real-life performance often differs substantially from the expectations. Moreover, we found that combining protocols is far from trivial, as individual network protocols may perform very different in combination with other protocols. The results of our research emphasize the necessity of a flexible generic benchmarking framework, powerful enough to evaluate and compare network protocols and their combinations in different use cases

Supporting protocol-independent adaptive QoS in wireless sensor networks

Next-generation wireless sensor networks will be used for many diverse applications in time-varying network/environment conditions and on heterogeneous sensor nodes. Although Quality of Service (QoS) has been ignored for a long time in the research on wireless sensor networks, it becomes inevitably important when we want to deliver an adequate service with minimal efforts under challenging network conditions. Until now, there exist no general-purpose QoS architectures for wireless sensor networks and the main QoS efforts were done in terms of individual protocol optimizations. In this paper we present a novel layerless QoS architecture that supports protocol-independent QoS and that can adapt itself to time-varying application, network and node conditions. We have implemented this QoS architecture in TinyOS on TmoteSky sensor nodes and we have shown that the system is able to support protocol-independent QoS in a real life office environment

Quality of service assurance for the next generation Internet

The provisioning for multimedia applications has been of increasing interest among researchers and Internet Service Providers. Through the migration from resource-based to service-driven networks, it has become evident that the Internet model should be enhanced to provide support for a variety of differentiated services that match applications and customer requirements, and not stay limited under the flat best-effort service that is currently provided. In this paper, we describe and critically appraise the major achievements of the efforts to introduce Quality of Service (QoS) assurance and provisioning within the Internet model. We then propose a research path for the creation of a network services management architecture, through which we can move towards a QoS-enabled network environment, offering support for a variety of different services, based on traffic characteristics and user expectations

A Survey on the Contributions of Software-Defined Networking to Traffic Engineering

Since the appearance of OpenFlow back in 2008, software-defined networking (SDN) has gained momentum. Although there are some discrepancies between the standards developing organizations working with SDN about what SDN is and how it is defined, they all outline traffic engineering (TE) as a key application. One of the most common objectives of TE is the congestion minimization, where techniques such as traffic splitting among multiple paths or advanced reservation systems are used. In such a scenario, this manuscript surveys the role of a comprehensive list of SDN protocols in TE solutions, in order to assess how these protocols can benefit TE. The SDN protocols have been categorized using the SDN architecture proposed by the open networking foundation, which differentiates among data-controller plane interfaces, application-controller plane interfaces, and management interfaces, in order to state how the interface type in which they operate influences TE. In addition, the impact of the SDN protocols on TE has been evaluated by comparing them with the path computation element (PCE)-based architecture. The PCE-based architecture has been selected to measure the impact of SDN on TE because it is the most novel TE architecture until the date, and because it already defines a set of metrics to measure the performance of TE solutions. We conclude that using the three types of interfaces simultaneously will result in more powerful and enhanced TE solutions, since they benefit TE in complementary ways.European Commission through the Horizon 2020 Research and Innovation Programme (GN4) under Grant 691567 Spanish Ministry of Economy and Competitiveness under the Secure Deployment of Services Over SDN and NFV-based Networks Project S&NSEC under Grant TEC2013-47960-C4-3-

Efficient resource management for end-to-end QoS guarantees in DiffServ networks

The Differentiated Services (DiffServ) architecture has been proposed as a scalable solution for delivering end-to-end Quality of Service (QoS) guarantees over the Internet. While the scalability of the data plane emerges from the definition of only a small number of different service classes, the issue of a scalable control plane is still an open research problem. The initial proposal was to use a centralized agent, called Bandwidth Broker (BB), to manage the resources within each DiffServ domain and make local admission control decisions. In this paper, we propose an alternative distributed approach, where the local admission decisions are made independently at the edge routers of each domain. We will show, through simulation results, that this distributed approach can manage the network resources very efficiently, leading to lower bandwidth blocking rates when compared to traditional shortest path admission control. Moreover, its simplicity and distributed implementation make it a very scalable solution for resource management in DiffServ networks.published_or_final_versio

Q-Andrew: a consolidated QOS management framework

Tese de mestrado em Segurança Informática, apresentada à Universidade de Lisboa, através da Faculdade de Ciências, 2008As redes IP convergentes são compostas por uma diversidade de tecnologias que suportam múltiplos tipos de serviços com diferentes características. Cada fabricante de equipamento activo de rede usa sistemas de manutenção proprietários, incompatíveis com equipamentos de outros fabricantes. Para um operador de telecomunicações a gestão da Qualidade de Serviço, numa rede composta por vários fabricantes, é uma tarefa complexa e dispendiosa. Algumas tarefas requerem configuração manual para garantir a compatibilidade entre configurações de equipamentos de fabricantes diferentes. Melhorar a resposta operacional e reduzir os custos de operação nestas circunstâncias é apenas possível com a consolidação da gestão de rede. Para responder a este desafio, propomos: Um conjunto de mecanismos geradores de configurações de Qualidade de Serviço, consistentes entre equipamentos de diversos fabricantes; A definição de um modelo abstracto de representação destas configurações, reutilizável em futuras aproximações de gestão consolidada de rede; Por fim, descrevemos uma aplicação de demonstração onde algumas das propostas apresentadas são concretizadas, tendo como objectivo futuro a sua utilização numa rede real de um operador de telecomunicações nacional, onde são utilizados equipamentos de diversos fabricantes.Converged IP networks consist of diverse technologies and support both legacy and emerging services. Different vendors use separate management systems to achieve similar goals. Manual provisioning today represents a large portion of the total effort required to manage a complex IP network. A consolidated Quality-of-Service policy is difficult to implement in heterogeneous networks. Creating and maintaining such policies is very demanding in terms of operations. For this reason, reducing operational costs while improving Quality-of-Service Management is only possible through a consolidated approach to network management. To leverage operations in converged IP networks, we propose the following: A mechanism to automatically generate consistent configurations across a network with equipment from different vendors; A framework definition such that network element configurations can be specified using a common model; Applying some of the methods proposed to an application that can be used in a real network with diverse technologies and equipment vendors