<s>
RNSAP	B-Protocol
(	O
Radio	O
Network	O
Subsystem	O
Application	O
Part	O
)	O
is	O
a	O
3GPP	O
signalling	O
protocol	O
responsible	O
for	O
communications	O
between	O
RNCs	O
Radio	O
Network	O
Controllers	O
defined	O
in	O
3GPP	O
specification	O
TS	O
25.423	O
.	O
</s>
<s>
It	O
is	O
carried	O
on	O
the	O
lur	O
interface	O
and	O
provides	O
functionality	O
needed	O
for	O
soft	B-Protocol
handovers	I-Protocol
and	O
SRNS	O
(	O
Serving	O
Radio	O
Network	O
Subsystem	O
)	O
relocation	O
(	O
handoff	O
between	O
RNCs	O
)	O
.	O
</s>
<s>
This	O
set	O
of	O
procedures	O
is	O
used	O
to	O
handle	O
mobility	O
with	O
in	O
the	O
UTRAN.This	O
is	O
the	O
most	O
important	O
of	O
the	O
RNSAP	B-Protocol
procedures	O
.	O
</s>
<s>
The	O
procedures	O
belonging	O
to	O
this	O
set	O
include	O
establishment	O
,	O
modification	O
and	O
release	O
of	O
dedicated	O
channel	O
in	O
the	O
DRNC	O
due	O
to	O
hard	O
and	O
soft	B-Protocol
handover	I-Protocol
,	O
set-up/release	O
of	O
dedicated	O
transport	O
connections	O
over	O
Iur	O
interface	O
and	O
data	O
transfer	O
for	O
dedicated	O
channels	O
.	O
</s>
