<s>
IEEE	B-Protocol
802.11h-2003	I-Protocol
,	O
or	O
simply	O
802.11h	B-Protocol
,	O
refers	O
to	O
a	O
2003	O
amendment	O
added	O
to	O
the	O
IEEE	O
802.11	O
standard	O
for	O
Spectrum	O
and	O
Transmit	O
Power	O
Management	O
Extensions	O
.	O
</s>
<s>
The	O
standard	O
provides	O
Dynamic	B-Protocol
Frequency	I-Protocol
Selection	I-Protocol
(	O
DFS	O
)	O
and	O
Transmit	O
Power	O
Control	O
(	O
TPC	O
)	O
to	O
the	O
802.11a	O
PHY	O
.	O
</s>
<s>
This	O
holds	O
especially	O
for	O
ISM	B-Algorithm
bands	I-Algorithm
(	O
Industrial	O
,	O
Scientific	O
and	O
Medical	O
)	O
which	O
are	O
unlicensed	O
and	O
free	O
to	O
use	O
.	O
</s>
<s>
To	O
address	O
the	O
coexistence	O
problems	O
in	O
those	O
bands	O
,	O
the	O
IEEE	O
has	O
started	O
the	O
802.11h	B-Protocol
Working	O
Group	O
to	O
make	O
recommendations	O
for	O
better	O
future	O
coexistence	O
.	O
</s>
