Scheduling algorithms for resilient packet ring networks with video transport applications.

摘要

The Resilient Packet Ring (RPR) architecture, known as the IEEE 802.17 standard, is an emerging network architecture and technology designed to meet the requirements of a packet-based metropolitan area network. The Priority Queue (PQ) algorithm is recommended as the scheduling scheme for RPR, which always gives priority to the transit buffer. Using this scheduling scheme in RPR, the high priority traffic, such as video packets waiting to access the ring at congested node in the transmit buffer, will suffer large delays and unsteady delay jitters. In this thesis, we propose new scheduling schemes which alternately select packets form the transit buffer and the high priority transmit buffer using the Deficit Round-Robin (DRR) algorithm which is known to be of low complexity. We investigate the system performance for the case of transmitting MPEG-4 encoded video as high priority traffic. Simulation results show certain improvements in the overall delay, delay jitter, and video quality.