<s>
Zebra	B-Protocol
Media	I-Protocol
Access	I-Protocol
Control	I-Protocol
(	O
Z-MAC	O
)	O
is	O
a	O
network	O
protocol	O
forwireless	O
sensor	B-Architecture
networks	I-Architecture
.	O
</s>
<s>
It	O
controls	O
how	O
a	O
Media	B-Protocol
Access	I-Protocol
Control	I-Protocol
(	O
MAC	O
)	O
accesses	O
a	O
common	O
communication	O
medium	O
of	O
a	O
network	O
.	O
</s>
<s>
Sensor	B-Architecture
networks	I-Architecture
consist	O
of	O
tiny	O
,	O
wirelessly	O
communicating	O
sensor	O
nodes	O
which	O
are	O
deployed	O
in	O
large	O
numbers	O
in	O
an	O
area	O
to	O
network	O
independently	O
.	O
</s>
<s>
They	O
constitute	O
a	O
special	O
form	O
of	O
mobile	B-General_Concept
ad-hoc	I-General_Concept
network	I-General_Concept
and	O
make	O
entirely	O
different	O
demands	O
on	O
a	O
network	O
protocol	O
than	O
,	O
for	O
example	O
,	O
the	O
Internet	O
.	O
</s>
<s>
The	O
protocol	O
is	O
relevant	O
to	O
the	O
protocols	O
S-MAC	B-Protocol
,	O
T-MAC	O
,	O
DSMAC	O
,	O
WiseMAC	O
,	O
μ-MAC	O
and	O
M-MAC	O
.	O
</s>
<s>
Z-MAC	O
combines	O
the	O
two	O
approaches	O
Carrier	O
Sense	O
Multiple	O
Access	O
(	O
CSMA	O
)	O
and	O
Time	B-Architecture
Division	I-Architecture
Multiple	I-Architecture
Access	I-Architecture
(	O
TDMA	O
)	O
so	O
that	O
the	O
network	O
behaves	O
at	O
low	O
data	O
load	O
as	O
in	O
CSMA	O
and	O
high	O
network	O
traffic	O
as	O
in	O
TDMA	O
.	O
</s>
