A Generic Service Model for QoS Management Service Management in Next Generation Network

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A Generic Service Model for QoS Management Service Management in Next Generation Network Tatiana Aubonnet Département Informatique Conservatoire National des Arts et Métiers, CEDRIC Paris, France Noemie Simoni Department INFRES TELECOM ParisTech, LTCI, UMR 5141 CNRS Paris, France Abstract—We introduce a generic service model aiming at ensuring Quality of Service management. This modelling approach has been proposed by the Next Generation Network and Service Management project. A fairly high integration level of the tools has been reached using object-oriented paradigm and Model Driven Interoperability approach. We provide an example of Quality of Service management through a Service Level Specification of the Virtual Private Network service. We consider important points to reflect the complexity introduced by the Service Level Agreement and Quality of Service management: reaction model, cooperation model and co-ordination model. Keywords-QoS management; SLS; proactive SLA; VPN I. INTRODUCTION Today, new services have to be rapidly deployed upon various types of networks. Moreover, the provisioning and the assurance of a wide range of services depends on the orchestration of heterogeneous, widely distributed software components, which can be owned by different service providers and operate over diverse networks. In such a scenario, designing and providing complex, value-added services, ensuring their nominal quality levels with traditional, service deployment, provisioning, monitoring and management becomes increasingly difficult and costly.

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A Generic Service Model for QoS Management

Service Management in Next Generation Network

Tatiana Aubonnet Département Informatique Conservatoire National des Arts et Métiers, CEDRIC Paris, France tatiana.aubonnet@cnam.fr Abstract—We introduce a generic service model aiming at ensuring Quality of Service management. This modelling approach has been proposed by the Next Generation Network and Service Management project. A fairly high integration level of the tools has been reached using object-oriented paradigm and Model Driven Interoperability approach. We provide an example of Quality of Service management through a Service Level Specification of the Virtual Private Networkservice. We consider important points to reflect the complexity introduced by the Service Level Agreement and Quality of Service management: reaction model, cooperation model and co-ordination model.

Keywords-QoS management; SLS; proactive SLA; VPN

I.INTRODUCTIONToday, new services have to be rapidly deployed upon various types of networks. Moreover, the provisioning and the assurance of a wide range of services depends on the orchestration of heterogeneous, widely distributed software components, which can be owned by different service providers and operate over diverse networks. In such a scenario, designing and providing complex, value-added services, ensuring their nominal quality levels with traditional, service deployment, provisioning, monitoring and management becomes increasingly difficult and costly. To answer this problem, one possible key of the service management is to build new services based on SLS (Service Level Specification) templates. According to the object-oriented concept (OMG standards) and MDI (Model Driven Interoperability)approach [2], we propose the object model description of the SLS templatefor QoS (Quality of Service)management. The main advantages of the object-oriented approach are the modelling, the overall behaviour of the system and the flexibility which permit modularity, portability, re-usability and easily extensible object classes. Our contribution to this problem is to take into account three management responsibilities: user, application and network. Additionally, we use the same modelling to which we add the following models: theco-ordination modelwhich addresses the dynamic management process by identifying the different steps which should be taken in a running (changing) context; theinteraction behaviour (reaction)

Noemie Simoni Department INFRES TELECOM ParisTech, LTCI, UMR 5141 CNRS Paris, France simoni@telecom-paristech.fr

modelfurther which specifies the autonomous degree of the distributed components (delegated agents: passive, active, interactive, proactive). By assigning the proactive behaviour type to the delegated agent according to different cases, more proactive SLA (Service Level Agreement) can be obtained for the QoS management. We present in this paper the feedback of our experience on the QoS dynamic management. This paper is organized as follows. The SLS context for QoS management is described in Section 2. Section 3 presents characteristics of existing SLS templates. Section 4 is devoted to our propositions for generic service model, the specification of a VPN service is developed as an example. We give an example of VPN architectural model in Section 5. Our propositions for a proactive SLA are presented in Section 6. Finally, in Section 7, we exhibit the advantages of our approach in Next Generation Network. II.SLSTEMPLATESUSAGEA Service Level Agreement (SLA) is a formal negotiated agreement between two parties. It is designed to create a common understanding about services, priorities, responsibilities, etc. [25]. A Service Offer or a Commercial Offer may by a set of elementary services. A Service Level Specification (SLS) is the technical part of a SLA. More formally it has been defined in [3] as a protocol independent representation of a set of technical parameters and their associated semantics that describe the transport service that a (packet) flow is to receive over the transport domain, between ingress and egress interfaces. The TMF (TeleManagement Forum)SLA Description corresponds to the SLS [14], the SLA template corresponds to the SLS template (Figure 1). A SLS template is associated to an elementary service. The SLS is a totally instantiated SLS template that can be used to provision, activate and monitor the corresponding elementary service. The question will remain in the latter case on how to manage the services consistency at the provisioning stage (synchronisation, rollback in case one of the services is unavailable, subscription sequence, etc.) and for assurance (correlation of elementary services alarms on the service offer, execution of proactive and reactive maintenance activities).

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