Source-Based Congestion Avoidance
Unlike the two previous congestion-avoidance schemes, which depended
on new mechanisms in the routers, we now describe a strategy for detecting
the incipient stages of congestion—before losses occur—from the end
hosts. We first give a brief overview of a collection of related mechanisms
that use different information to detect the early stages of congestion, and
then we describe a specific mechanism in some detail.