Design And Analysis Of Voice And Critical Data Priority Queue (VCDPQ) Scheduler For Constrained-Bandwidth Voip Networks

摘要

Voice over Internet Protocol (VoIP) networks are converged information superhighway systemsfor transporting multimedia traffics, such as: voice, video and data traffics. In the quest to optimize the Qualityof Service (QoS) of these networks, many schemes have been proposed to address the needs of both real-timeand non real-time traffic flows. In most of the schemes, low latency and packet loss to the streaming flows aswell as fair resource utilization are guaranteed only if the rate of the real-time traffic flow is a small fraction ofthe link capacity. Again, earlier solutions to the QoS challenges of VoIP networks have been focused on givingprecedence to voice traffic at the expense of time-sensitive business/mission critical data (B/MCD) traffics. Thiswork therefore investigates the contributions of delay and packet loss impairment factors to the overall qualitydegradation of VoIP networks. It proposes an optimized voice and B/MCD fair and priority traffic scheduler forconstrained-bandwidth VoIP networks. The scheduler incorporates mechanisms to achieve a graceful trade-offbetween priority and fairness to all traffics. Riverbed (OPNET) Modeler was used to validate the proposedarchitecture. Simulation results obtained show that the proposed architecture guarantees good mouth-to-eardelay and packet loss probability.