Joseane Farias Fidalgo

PBMAN: a Policy-based Management Framework for Ambient Networks

Ambient networks aim at providing new networking solutions to highly mobile users considering a mix of current and future wireless technologies. In the last years, policy-based approaches have been proposed as an effective way of managing large networks, e.g. the IETF policy framework. In this paper, we present the design and implementation of PBMAN, a Policy-based Management Framework for Ambient Networks. PBMAN is based on a P2P infrastructure, aimed at providing scalability and self-configuration features

XACML-Based Composition Policies for Ambient Networks

Ambient Networks (AN) pose new challenges to the management discipline, and policies are considered to be an adequate solution for providing flexibility, distributed control, and self-management features. However, the current state-of the art IETF policy framework was not designed for the challenges of new 3G/4G environments such as AN. This paper presents PBMAN, a policy-based architecture and a composition framework that extends the AN architecture, where policies are intrinsically at the underlying layer by design and not as a later ad-on. The use of policies and their interaction with network composition is the main research challenge of PBMAN. The current architecture has been designed based on previous experience, on a design-implement-test development cycle. The framework was used to model a video on demand scenario, whereto composition policies based on an extended version of the XACML policy language have been written.

On the use of peer-to-peer architectures for the management of highly dynamic environments

Scalable distributed management is a key challenge for current Internet services and necessary for future ubiquitous services of wireless mobile users. Policy-based management (PBM) is seen as a practical solution for dealing with the needs of new advanced services for highly dynamic wireless environments. The IETF developed a two-tier client/server PBM framework, yet it requires some important extensions in such environments. In this paper we look into new management mechanisms for dealing with these limitations by proposing the peer-to-peer policy management infrastructure (P4MI), a PBM framework based on peer-to-peer technology as the main enabling mechanism. We instantiate this abstract framework to ambient networks, a new concept aimed at creating network solutions for new mobile and wireless systems. We show that the P4MI is both a scalable and a complete PBM solution for coping with the challenges of ambient networks

Design and implementation of a policy-based management framework for Ambient Networks: Choices and lessons learned

The management of large-scale 3G and 4G wireless systems, such as ambient networks (AN), in the Internet is a challenge, due to their inherent heterogeneous and distributed nature. In this paper we present our experience with the design and implementation of PBMAN, a Policy-based Management framework for AN, which gives special attention to network composition. We discuss the main choices as well as the lessons we learned during this process and the next steps.

Estimating Video Quality over ADSL2+ under Impulsive Line Disturbance

QoS Provisioning for 3P over xDSL remains a challenging task due to the effects of line impairments on such services. Differently from simple data, video and voice services have strict requirements for loss and delay tolerance. The accurate assessment of final service quality is part of this provisioning process, but its direct measurement is yet not practical. In this paper we explore the possibility of estimating service quality, with focus on video delivery, by investigating its relationship with performance data available to xDSL operators and deriving models for estimating quality from this data. Experiments using a real xDSL platform and different noise types were conducted. The derived models showed to be accurate enough to estimate video quality for the scenarios evaluated.

Effective implementation of network composition for ambient networks

Ambient Networks propose the concept of network composition for providing dynamic and instant resource access for roaming users. policy-based management (PBM) is a good candidate for a service management platform in such scenarios. However, PBM infrastructures for large-scale service management in 3G/4G environments are still to be developed. This paper presents a prototype implementation of a PBM approach for network composition that uses a tree-based information model mapped on a peer-to-peer storage mechanism. A preliminary, measurement-based performance analysis of the prototype is presented along with a discussion on the strategies used, their benefits and pitfalls.

Challenges for the Brazilian Green and Yellow Internet

This chapter describes the challenges for designing a new generation network architecture for Brazil. One that not only considers the introduction of the new technological breakthroughs, though important, but also develops scenarios for their deployment, benefiting the remote and poorer regions of Brazil, often forgotten from major development initiatives. The next Yellow and Green Internet (YGI) represents a special opportunity to ensure that our communities do not miss a unique chance to adapt the next Internet to some of the harsh realities of a large part of the Brazilian realities including regions and communities where communications remain almost non-existent and isolation has reigned for considerable time.

Policy Processing: Don't Take it for Granted

The new advanced services and limitations of current Internet have driven a lot of initiatives in architectures for Future Internet. Ambient Networks is one of these initiatives, focused in providing a seamless cooperation of resources in an environment with a multitude of access technologies, network operators and business actors. There are many efforts using Policy based Management as a practical solution for addressing the challenges for the management of Future Internet such as cross-domain management, integration and manipulation of data across the world, seamless mobility, reliability, performance and heterogeneity support. However, not much attention has been given to the policy processing itself. In this paper we present our policy processing system, currently used in the PBMAN project, a policy based management architecture and prototype for Ambient Networks. The primary contribution of this paper is to give real attention to the components of policy systems that can determine its performance as well as its successful adoption.

A simple performance policy management environment

A great deal of research has gone into the specification of policies and protocols for the management of networks. The benefits of this new paradigm are beyond any doubts. This paper looks at the challenge of building such platforms that automate all the steps starting at the specification and going all the way to enforcing policies in QoS network. First a policy language is defined, next we present a policy parser and show how policies are mapped onto the underlying network mechanisms. A number of case studies are illustrated in order to validate these ideas.