<s>
Whenever	O
user	O
equipment	O
(	O
UE	O
)	O
is	O
being	O
provided	O
with	O
any	O
service	O
(	O
CS/PS	O
service	O
)	O
,	O
the	O
service	O
has	O
to	O
be	O
associated	O
with	O
a	O
Radio	O
Bearer	O
specifying	O
the	O
configuration	O
for	O
layer	B-Protocol
2	I-Protocol
and	O
physical	B-Application
layer	I-Application
in	O
order	O
to	O
have	O
its	O
QoS	O
clearly	O
defined	O
.	O
</s>
<s>
Radio	O
bearers	O
are	O
channels	O
offered	O
by	O
Layer	B-Protocol
2	I-Protocol
to	O
higher	O
layers	O
for	O
the	O
transfer	O
of	O
either	O
user	O
or	O
control	O
data	O
.	O
</s>
<s>
In	O
other	O
words	O
,	O
Layer	B-Protocol
2	I-Protocol
offers	O
to	O
the	O
upper	O
layers	O
the	O
service	O
of	O
information	O
transmission	O
between	O
the	O
UE	O
and	O
the	O
UTRAN	O
by	O
means	O
of	O
the	O
Radio	O
Bearers	O
(	O
RBs	O
)	O
and	O
Signaling	O
Radio	O
Bearers	O
(	O
SRBs	O
)	O
.	O
</s>
<s>
Therefore	O
,	O
the	O
service	O
access	O
points	O
between	O
Layer	B-Protocol
2	I-Protocol
and	O
upper	O
layers	O
are	O
RBs	O
.	O
</s>
<s>
The	O
purpose	O
of	O
a	O
Radio	O
Access	O
Bearer	O
(	O
RAB	O
)	O
is	O
to	O
provide	O
a	O
connection	O
segment	O
using	O
the	O
WCDMA	O
Radio	O
Access	O
Network	O
(	O
WCDMA	O
RAN	O
)	O
for	O
support	O
of	O
a	O
UMTS	B-Protocol
bearer	O
service	O
.	O
</s>
<s>
The	O
WCDMA	O
RAN	O
can	O
provide	O
Radio	O
Access	O
Bearer	O
connections	O
with	O
different	O
characteristics	O
in	O
order	O
to	O
match	O
requirements	O
for	O
different	O
UMTS	B-Protocol
bearers	O
.	O
</s>
<s>
Video	O
telephony	O
and	O
ftp	B-Protocol
services	O
may	O
be	O
offered	O
across	O
the	O
Conversational	O
64	O
kbit/s	O
Circuit	O
Switched	O
(	O
CS	O
)	O
RAB	O
.	O
</s>
<s>
Transport	O
channel	O
parameters	O
TrCH	O
Type	O
DCH	O
(	O
DCCH	O
)	O
TB	O
size	O
100	O
TF	O
0	O
0	O
x	O
100	O
TF	O
1	O
1	O
x	O
100	O
TTI	O
(	O
ms	O
)	O
40	O
Coding	O
type	O
Conv	O
,	O
1/3	O
CRC	O
12	O
bit	O
Downlink	O
physical	B-Application
channel	I-Application
DTX	O
Position	O
n/a	O
TFCI	O
used	O
Slot	O
structure	O
5	O
SF	O
256Uplink	O
physical	B-Application
channel	I-Application
Min	O
.	O
</s>
