<s>
Micro	B-Protocol
Transport	I-Protocol
Protocol	I-Protocol
or	O
μTP	B-Protocol
(	O
sometimes	O
also	O
uTP	O
)	O
is	O
an	O
open	O
UDP-based	O
variant	O
of	O
the	O
BitTorrent	B-Protocol
peer-to-peer	O
file	O
sharing	O
protocol	O
intended	O
to	O
mitigate	O
poor	O
latency	O
and	O
other	O
congestion	O
control	O
problems	O
found	O
in	O
conventional	O
BitTorrent	B-Protocol
over	O
TCP	B-Protocol
,	O
while	O
providing	O
reliable	O
,	O
ordered	O
delivery	O
.	O
</s>
<s>
It	O
was	O
devised	O
to	O
automatically	O
slow	O
down	O
the	O
rate	O
at	O
which	O
packets	O
of	O
data	O
are	O
transmitted	O
between	O
users	O
of	O
peer-to-peer	O
file	O
sharing	O
torrents	B-Protocol
when	O
it	O
interferes	O
with	O
other	O
applications	O
.	O
</s>
<s>
For	O
example	O
,	O
the	O
protocol	O
should	O
automatically	O
allow	O
the	O
sharing	O
of	O
an	O
DSL	O
line	O
between	O
a	O
BitTorrent	B-Protocol
application	O
and	O
a	O
web	O
browser	O
.	O
</s>
<s>
μTP	B-Protocol
emerged	O
from	O
research	O
at	O
Internet2	O
on	O
QoS	O
and	O
high-performance	O
bulk	O
transport	O
,	O
was	O
adapted	O
for	O
use	O
as	O
a	O
background	O
transport	O
protocol	O
by	O
Plicto	O
,	O
founded	O
by	O
Stanislav	O
Shalunov	O
and	O
Ben	O
Teitelbaum	O
and	O
later	O
acquired	O
by	O
BitTorrent	B-Protocol
,	O
Inc	O
.	O
in	O
2006	O
,	O
and	O
further	O
developed	O
within	O
its	O
new	O
owner	O
.	O
</s>
<s>
It	O
was	O
first	O
introduced	O
in	O
the	O
μTorrent	B-Application
1.8.x	O
beta	O
branches	O
,	O
and	O
publicized	O
in	O
the	O
alpha	O
builds	O
of	O
μTorrent	B-Application
1.9	O
.	O
</s>
<s>
The	O
implementation	O
of	O
μTP	B-Protocol
used	O
in	O
μTorrent	B-Application
was	O
later	O
separated	O
into	O
the	O
"	O
libutp	O
"	O
library	O
and	O
published	O
under	O
the	B-License
MIT	I-License
license	I-License
.	O
</s>
<s>
The	O
first	O
free	B-Application
software	I-Application
client	O
to	O
implement	O
μTP	B-Protocol
was	O
KTorrent	B-Language
4.0	O
.	O
libtorrent	B-Language
implements	O
μTP	B-Protocol
since	O
version	O
0.16.0	O
and	O
it	O
is	O
used	O
in	O
qBittorrent	B-Application
since	O
2.8.0	O
.	O
</s>
<s>
Tixati	B-Protocol
implements	O
μTP	B-Protocol
since	O
version	O
1.72	O
.	O
</s>
<s>
Vuze	B-Application
(	O
formerly	O
Azureus	B-Application
)	O
implements	O
μTP	B-Protocol
since	O
version	O
4.6.0.0	O
.	O
</s>
<s>
Transmission	B-Language
implements	O
μTP	B-Protocol
since	O
version	O
2.30	O
.	O
</s>
<s>
The	O
congestion	O
control	O
algorithm	O
used	O
by	O
μTP	B-Protocol
,	O
known	O
as	O
Low	B-Protocol
Extra	I-Protocol
Delay	I-Protocol
Background	I-Protocol
Transport	I-Protocol
(	O
LEDBAT	B-Protocol
)	O
,	O
aims	O
to	O
decrease	O
the	O
latency	O
caused	O
by	O
applications	O
using	O
the	O
protocol	O
while	O
maximizing	O
bandwidth	O
when	O
latency	O
is	O
not	O
excessive	O
.	O
</s>
<s>
Additionally	O
,	O
information	O
from	O
the	O
μTP	B-Protocol
congestion	O
controller	O
can	O
be	O
used	O
to	O
choose	O
the	O
transfer	O
rate	O
of	O
TCP	B-Protocol
connections	O
.	O
</s>
<s>
LEDBAT	B-Protocol
is	O
described	O
in	O
.	O
</s>
<s>
As	O
of	O
2009	O
,	O
the	O
details	O
of	O
the	O
μTP	B-Protocol
implementation	O
were	O
different	O
from	O
those	O
of	O
the	O
then-current	O
Internet	O
Draft	O
.	O
</s>
<s>
μTP	B-Protocol
also	O
adds	O
support	O
for	O
NAT	B-Protocol
traversal	I-Protocol
using	O
UDP	B-Protocol
hole	O
punching	O
between	O
two	O
port-restricted	O
peers	O
where	O
a	O
third	O
unrestricted	O
peer	O
acts	O
as	O
a	O
STUN	B-Protocol
server	O
.	O
</s>
