LEDBAT

Low Extra Delay Background Transport (LEDBAT) is a way to transfer data on the Internet quickly without clogging the network. LEDBAT was invented by Stanislav Shalunov and is used by Apple for software updates, by BitTorrent for most of its transfers and by Microsoft SCCM software distribution points. At one point in time, LEDBAT was estimated to carry 13–20% of Internet traffic.

LEDBAT is a delay-based congestion controlalgorithm that uses all the available bandwidth while limiting the increase in delay; it does so by measuring one-way delay and using changes in the measurements to limit congestion that the LEDBAT flow itself induces in the network. LEDBAT is described in RFC 6817.