Avaliação objetiva da qualidade de experiência em redes IEEE 802.16: mecanismos avançados de controle e descartes de pacotes de streaming de vídeo

Abstract

THe traffic of multimedia content is incresing in fixed broadband networks, wireless and mobile. However, the current qualilty level controla mechanisms implemented by broadband access networks are not enought to assure high quality video distribution for thousands of users. This work describes a set of QoE (Quality of Experience) algorithms for IEEE 802.16/WiMAX networks, where they optimize the distribution of video content by implementing advanced packet dropper mechanisms based on temporal and spational redundancy, complexity and motion levels, GoP (Group of Pictures) size, bitrate, available bandwidth, as well as the user perception. The impact of the algorithms on QoE was carried out by using simulation experiments, where objective QoE metrics were used to evaluate the performance of these mechanisms in WiMAX networks according to the user experience, including a comparasion with traditional schemes only based in QoS (Quality of Service).