Systems and methods for goodput guarantee through adaptive fair queuing

A digital communications unit for transmitting a plurality of data flows on a shared communications channel, the digital communications unit comprising:

• a processing unit;
• a memory coupled to the processing unit;
• a channel interface adapted to connect with the shared communications channel, coupled to the processing unit, coupled to the memory, configured to operate under the control of the processing unit, and configured to transmit a plurality of data streams from the memory through the shared communications channel;
• a weights generation module coupled to the processing unit and configured to calculate optimal goodput rates for the plurality of data streams;
• a high-layer overhead estimation module counled to the weights generation module;
• a rate adaptation estimation module coupled to the weights generation module;
• a low-layer overhead estimation module coupled to the weights generation module;
• a fair queuing module coupled to the channel interface and to the weights generation module, and configured to allocate channel capacity on the shared communications channel to the plurality of data streams in response to the optimal goodput rates calculated by the weights generation module;
• wherein the weights generation module is configured (a) to calculate relationships between throughput and goodput in response to overhead information and loss rate information received from the high-layer overhead estimation module, from the rate adaptation estimation module, and from the low-layer overhead estimation module, and (b) to calculate the optimal goodput rates in response to the relationships between throughout and goodput.