Quality of Service Mapping Mechanism for Packet Video in Di erentiated Services Network

This research presents a futuristic framework for Quality of Service (QoS) mapping between practically categorized packet video and relative di erentiated service (Di Serv) network employing uni ed priority index and adaptive packet forwarding mechanism under a given pricing model (e.g., Di Serv level di erentiated price/packet). Video categorization is based on the relative priority index (RPI), which represents the relative preference per each packet in terms of loss and delay. We propose an adaptive packet forwarding mechanism for a Di Serv network to provide stable and persistent service di erentiation. E ective QoS mapping is then performed by mapping a video packet onto di erent Di Serv level based on RPI. To verify the eÆciency of the proposed strategy, the end-to-end performance is evaluated through the error resilient packet video transmission using ITU-T H.263+ codec over a simulated Di Serv network. Results show that the proposed QoS mapping framework can exploit the relative Di Serv advantage and result in much persistent service di erentiation between Di Serv levels and an enhanced end-to-end video quality with the same pricing constraint.