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'''Micro Transport Protocol''' or '''µTP''' (sometimes also '''uTP''') is an [[open standard|open]] [[User Datagram Protocol|UDP]]-based variant of the [[BitTorrent (protocol)|BitTorrent]] [[peer-to-peer file sharing]] [[Protocol (computing)|protocol]] intended to mitigate poor latency and other [[network congestion#Congestion control|congestion control]] issues found in conventional BitTorrent over TCP, while providing reliable, ordered delivery.
It was devised to automatically slow down<ref>http://forum.bittorrent.org/viewtopic.php?pid=762#p762{{dead link|date=May 2016}}</ref> the rate at which packets of data are transmitted between users of [[peer-to-peer]] file sharing [[BitTorrent (protocol)|torrents]] when it interferes with other applications. For example, the protocol should automatically allow the sharing of an ADSL line between a BitTorrent application and a web browser.
==Development==
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==µTP congestion control==
The congestion control algorithm used by µTP, known as Low Extra Delay Background Transport ([[LEDBAT]]), aims to decrease the latency caused by applications using the protocol while maximizing bandwidth when latency is not excessive.<ref>[http://searchnetworking.techtarget.com.au/articles/27957-Torrents-of-Disruption-on-the-Way- Technical information about UDP]</ref><ref>http://forum.bittorrent.org/viewtopic.php?pid=762#p762{{dead link|date=May 2016}}</ref> Additionally, information from the µTP congestion controller can be used to choose the transfer rate of TCP connections.<ref>{{cite web
| url = http://forum.utorrent.com/viewtopic.php?pid=377209#p377209
| date = 2008-11-26
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| title = Low Extra Delay Background Transport (LEDBAT)
| accessdate = 2010-05-30}}</ref>
but the details of the µTP implementation are different from those of the draft.<ref>http://forum.bittorrent.org/viewtopic.php?pid=753#p753{{dead link|date=May 2016}}</ref>{{Citation broken|date=December 2014}}
µTP also adds support for [[NAT traversal]] using [[UDP hole punching]] between two port-restricted peers where a third unrestricted peer acts as a [[STUN]] server.<ref>http://forum.utorrent.com/viewtopic.php?id=49813{{dead link|date=May 2016}}</ref><ref>http://forum.utorrent.com/viewtopic.php?pid=407732#p407732{{dead link|date=May 2016}}</ref>
==See also==
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