Gerenciamento da transmissão de aplicações hipermídia em modo push

Abstract

Nowadays hypermedia content may be delivered using different networking technolo- gies, such as terrestrial broadcasting, satellite, IPTV and the Web. Therefore hypermedia presentation engines must be designed taking into consideration the specificities of their supported networks, in order to provide the expected QoS/QoE levels. Advanced pre sentation engines should also employ hypermedia content analysis to help on the task of maintaining QoE levels. Specifically, when the hypermedia content includes pulled data, presentation engines may create a Content Prefetching Plan based on the presentation behavior learned from the specification of that content. However, when the hypermedia content includes pushed data, this content analysis should be transferred to the server side and be taken as a basis for building the so-called Content Transmission Plan. The Content Transmission Plan is a data structure that predicts the time when media objects should start to be transmitted and for how long, in order to optimize end-to-end resource usage such as communication bandwidth and storage space in receivers. This work pro poses a framework for managing the push-mode delivery of hypermedia content. The framework is generic enough to be instantiated over different content delivery scenarios that may employ different protocols and management techniques. Several instantiation scenarios and their respective results are also discussed in this dissertation.