<s>
In	O
a	O
packet-based	O
communications	O
network	O
,	O
packet	B-Protocol
aggregation	I-Protocol
is	O
the	O
process	O
of	O
joining	O
multiple	O
packets	B-Protocol
together	O
into	O
a	O
single	O
transmission	B-Protocol
unit	I-Protocol
,	O
in	O
order	O
to	O
reduce	O
the	O
overhead	O
associated	O
with	O
each	O
transmission	O
.	O
</s>
<s>
Packet	B-Protocol
aggregation	I-Protocol
is	O
useful	O
in	O
situations	O
where	O
each	O
transmission	B-Protocol
unit	I-Protocol
may	O
have	O
significant	O
overhead	O
(	O
preambles	O
,	O
headers	O
,	O
cyclic	O
redundancy	O
check	O
,	O
etc	O
.	O
)	O
</s>
<s>
or	O
where	O
the	O
expected	O
packet	B-Protocol
size	O
is	O
small	O
compared	O
to	O
the	O
maximum	O
amount	O
of	O
information	O
that	O
can	O
be	O
transmitted	O
.	O
</s>
<s>
In	O
a	O
communication	O
system	O
based	O
on	O
a	O
layered	O
OSI	O
model	O
,	O
packet	B-Protocol
aggregation	I-Protocol
may	O
be	O
responsible	O
for	O
joining	O
multiple	O
MSDUs	O
into	O
a	O
single	O
MPDU	O
that	O
can	O
be	O
delivered	O
to	O
the	O
physical	B-Application
layer	I-Application
as	O
a	O
single	O
unit	O
for	O
transmission	O
.	O
</s>
<s>
The	O
ITU-T	B-General_Concept
G.hn	I-General_Concept
standard	O
,	O
which	O
provides	O
a	O
way	O
to	O
create	O
a	O
high-speed	O
(	O
up	O
to	O
1	O
Gigabit/s	O
)	O
Local	B-General_Concept
area	I-General_Concept
network	I-General_Concept
using	O
existing	O
home	O
wiring	O
(	O
power	B-Device
lines	I-Device
,	O
phone	O
lines	O
and	O
coaxial	B-Protocol
cables	I-Protocol
)	O
,	O
is	O
an	O
example	O
of	O
a	O
protocol	O
that	O
employs	O
packet	B-Protocol
aggregation	I-Protocol
to	O
increase	O
efficiency	O
.	O
</s>
