Flow control of bursty voice traffic in broadband networks

The authors present a framework for a flow control algorithm and analyze an effective access congestion control scheme that is applied at the input access node to the network. The scheme is based upon a preventive control principle and uses a feedback control signal that is a function of the buffer occupancy level to control the source coder sampling rate. The scheme avoids congestion and enhances the statistical multiplexing effect, consequently providing a high bandwidth utilization at a specific class of service. The scheme can be applied as a traffic shaping and enforcement function. The resulting quasi birth death queueing process was studied with state dependent arrivals using matrix-geometric techniques, and it was found that both MMPP/ER/1/K and the Poisson process approximations yield quite close results in an asynchronous transport model multiplexer with small buffer size and feedback control.<>