On WEBRC Wave Design and Sender Implementation

A WEBRC sender transmits packets on a base channel and on T wave channels. The transmission pattern on each wave channel is a sequence of periodically-spaced waves separated by quiescent periods. In a fluid model, the rate of each wave is predominantly described by an exponential decay by a factor of P each TSD seconds. The beginnings of the waves are designed so that the sum over all of the channels of the fluid-model rate is constant. This design is complicated by requirements motivated by keeping receiver MRTT measurements simple. Presented here is the design of the beginnings of the waves and a mechanism to convert fluid-model rates to packet transmission times. The final design has two parameters to trade off the range of fine-grained rate control against the maximum interpacket spacing in the early portion of the wave. For the sake of brevity, this document is far from self-contained. Those unfamiliar with WEBRC should see [1, 2] for an introduction.