<s>
A	O
Radio	B-Protocol
Access	I-Protocol
Technology	I-Protocol
or	O
(	O
RAT	O
)	O
is	O
the	O
underlying	O
physical	O
connection	O
method	O
for	O
a	O
radio	O
based	O
communication	O
network	O
.	O
</s>
<s>
Many	O
modern	O
mobile	O
phones	O
support	O
several	O
RATs	O
in	O
one	O
device	O
such	O
as	O
Bluetooth	B-Protocol
,	O
Wi-Fi	O
,	O
and	O
GSM	O
,	O
UMTS	B-Protocol
,	O
LTE	O
or	O
5G	O
NR	O
.	O
</s>
<s>
Based	O
on	O
this	O
measurement	O
report	O
provided	O
by	O
the	O
mobile	O
terminal	O
,	O
the	O
network	O
can	O
initiate	O
handover	B-Protocol
from	O
one	O
RAT	O
to	O
another	O
,	O
e.g.	O
</s>
<s>
Once	O
the	O
handover	B-Protocol
with	O
the	O
new	O
RAT	O
is	O
completed	O
,	O
the	O
channels	O
used	O
by	O
the	O
previous	O
RAT	O
are	O
released	O
.	O
</s>
