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Towards SLA and location-based nomadism management
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In this work, we focus on Service Level Agreement "SLA" driven nomadism management in wireless corporate networks. We adopt a novel top down approach in dealing with this problem. We aim at automatic equipment configuration based on high level company objectives and strategies for nomadism. For that, we propose a service-oriented management architecture, which starts at the specification of company objectives and strategies and down through SLAs until reaching instance level configurations.
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Growing demands for the public wireless broadband services will require more capacity than the one provided by IP-based service
providers (ISPs). The increasing popularity of WLANs due to the use of license-free radio spectrum with low-cost, easily deployable,
high-data-rate wireless services, has encouraged service providers to consider their deployment in high density usage areas
such us public hotspots to provide complementary broadband access to their networks and services. In order to provide consistent
QoS control for multimedia applications (VoIP, VoD,...) over hotspots, a Session Initiation Protocol (SIP) based QoS management
architecture is proposed in this article. Performance evaluations are discussed to illustrate the feasibility of the proposed
architecture.
In this paper, we contribute on the service-driven management of quality of service and user access in wireless corporate networks. We propose a Service-Level Agreement (SLA) oriented nomadism management architecture with a top-down vision starting by the specification of company objectives and going down to device-level configurations. We define an algorithm for the automatic translation of application-level quality assurance parameters into network-level configuration parameters. A prototype implementation of our solution to the SLA-driven enterprise nomadism management is presented along with preliminary results on the self-adaptive capabilities of our QoS mapping algorithm.
In this article, we focus on the service-driven management of quality of service and user access in wireless corporate networks. We propose a service-level agreement (SLA) oriented nomadism management architecture with a top-down vision starting by the specification of company objectives and going down to device-level configurations. We define an algorithm for the automatic translation of application-level quality assurance parameters into network-level configuration parameters. The description of the prototype implementation of our solution to the SLA-driven enterprise nomadism management is given and preliminary results on the self-adaptive capabilities of our mapping algorithm are given.
In this paper, we present several challenges and innovative approaches to support nomadic computing. The nomadic computing environment is characterized by mobile users that may be connected to the network via wired or wireless means, many of whom will maintain only intermittent connectivity with the network. Furthermore, those accessing the network via wireless links will contend with limitations of the wireless media. We consider three general techniques for addressing these challenges: (1) asymmetric design of applications and protocols, (2) the use of network-based proxies which perform complex functions on behalf of mobile users, and (3) the use of pre-fetching and caching of critical data. We examine how these techniques have been applied to several systems, and present results in an attempt to quantify their relative effectiveness.
We are in the midst of some truly revolutionary changes in the field of computer-communications, and these offer opportunities and challenges to the research community. One of these changes has to do with nomadic computing and communications. Nomadicity refers to the system support needed to provide a rich set of capabilities and services to the nomad as he moves from place to place in a transparent and convenient form. This new paradigm is already manifesting itself as users travel to many different locations with laptops, PDA's, cellular telephones, pagers, etc. In this paper we discuss some of the open issues that must be addressed as we bring about the system support necessary for nomadicity. In addition, we present some of the considerations with which one must be concerned in the area of wireless communications, which forms one (and only one) component of nomadicity. 1. INTRODUCTION 1 There are few things in one's professional life as gratifying as finding a powerful new analyti...
In this work we propose GXLA, a language for the specification of Service Level Agreements (SLA). GXLA represents the implementation of the Generalized Service Level Agreement (GSLA) information model we proposed in a previous work. It supports multi-party service relationships through a role-based mechanism. It is intended to catch up the complex nature of service interactivity in the broader range of SLA modeling of all sorts of IT business relationships. GXLA is defined as an XML schema which provides a common ground between the entities in order to automate the configuration. GXLA can be used by service providers, service customers, and third parties in order to configure their respective IT systems. Each party can use its own independent SLA interpretation and deployment technique to enforce the role it has to play in the contract. An illustrative VoIP service negotiation shows how GXLA is used for automating the process of SLA negotiation and deployment.
The management of network infrastructure in an enterprise is a
complex and. daunting affair. In an era of increasing technical
cornplexity, it is becoming difficult to find trained personnel who can
manage the new features introduced into the various servers, routers,
and switches. Policy-based network management provides a means by which
the administration process can be simplified and largely automated. In
this article we look at a general policy-based architecture that can be
used to simplify several new technologies emerging in the context of IP
networks. We explain how network administration can be simplified by
defining two levels of policies, a business level and a technology
level. We discuss how business-level policies are validated and
transformed into technology-level policies, and present some algorithms
that can be used to check for policy conflicts and unreachable policies.
We then show how to apply this architecture to two areas: managing
performance service level agreements, and supporting enterprise
extranets using IPSec communication
Wireless local-area networks (WLANs) based on the IEEE 802.11 technology have been widely adopted for private use over the past few years. However, several issues remain concerns for large-scale deployment in corporate environments. Enforcing security and quality-of-service (QoS) has become a fundamental challenge to managing IEEE 802.11-based enterprise networks. In order to provide corporate networks with a global management solution, we have designed a service-oriented management system that enables user-centric service provisioning, while enforcing security and QoS requirements. As enterprises may be comprised of a number of distinct networks, we have extended our system to support the roaming of users between different enterprise sites. In this paper, we describe the design, implementation, and performance evaluation of our solution.
(GXLA a Language for the Specification of Service Level Agreements) Autonomic Networking AN'06
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Multimedia Wireless Networks: Technologies, Standards and QoS
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Wireless Networks: Technologies, Standards and QoS.
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