Free Trial

Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.

Share this Page URL

Chapter 5. Federating Autonomic Network ... > Example Scenario: End-to-End Managem... - Pg. 110

110 CHAPTER | 5 Federating Autonomic Network Management Systems has already been demonstrated for autonomic networking approaches [10, 11]. Using these techniques it is possible to model the resources being managed, the context used in communications services, and the policies used to express gov- ernance. For a federated environment, semantic mapping is essential to allow the sharing and common understanding of contracts and policies, which together govern the interactions between different management elements. We note that traditional semantic mapping approaches, as surveyed in [12], generally assume that the mapping task is performed by a knowledge engineer, whose task is to generate a full static mapping between models that will be used by several applications. This is a constrained and static view of the semantic mapping process that would not meet the requirement for development of a full methodology for integration of disparate knowledge as envisaged in the Shared Semantics layer of our layered federation model. Furthermore, in the context of the LFM Shared Semantics layer, mappings in support of federations will need to be generated to be task-specific and context-sensitive, be able to repre- sent partial knowledge, and need to be tracked, managed, and maintained over time [13]. EXAMPLE SCENARIO: END-TO-END MANAGEMENT OF IPTV SERVICES We now explore a potential deployment scenario for flexibly supporting feder- ations of networks, their management systems, the organizations that control them, and the users of their services. The scenario focuses on end-to-end delivery of Internet Protocol-based Television (IPTV) content from IPTV ser- vice providers' data centers to devices located in users' Home Area Networks (HANs). Deployment of IPTV is a major growth area in the telecommunications market at present, with many network operators seeing IPTV services as the next major driver of revenue. However, large-scale deployment of IPTV presents sig- nificant technical challenges. For television services, users have expectations of high levels of Quality of Service (QoS) and Quality of Experience (QoE), how- ever, it is very difficult to ensure that sufficient bandwidth is available across an end-to-end path spanning multiple management domains and heterogeneous device types. Today, IPTV service provision typically only takes place within a single net- work operator's domain or between an operator's domain and the domain of a closely associated third-party service provider. A typical current deployment is described by Hu et al. [14], who outline how IPTV services are delivered in Chunghwa Telecom's Taiwanese network. The advantage for operators of con- trolling all aspects of IPTV service provision is that ownership of the access network to the customer premises gives them the fine-grained control of net- work capabilities required to provide the necessary QoS/QoE guarantees for real-time media streaming. Furthermore, direct access to configure set-top boxes in customer premises allows them support for enhanced features such as live