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UTRAN Procedures
Elementary procedures
Paging RRC connection setup Transaction reasoning Authentication and security control Transaction setup with RAB allocation
Transaction clearing and RAB release RRC connection releaseRRM procedures Radio link addition and deletion Intersystem handover from UMTS to GSM (CS/PS) UE state transitions/ bearer reconfiguration
MM procedures -> see MM slidesCM procedures -> see CM slides
References: Kaaranen ch. 10 (simple cases discussed here)
3GPP TR 25.931 (more complicated cases)
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Basic Model of UMTS Network Transactions
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction
(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
UE indicates the CNthe requested service
A transaction comprises all the elementaryprocedures required to enable
the transport of user data (PS or CSmode) or
the exchange of higher-layer signalingmessages (e.g. MM or CM)
Allocation of bearers to supportrequired UMTS bearer service
Transfer of data
Release of all bearers to supportUMTS bearer service
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UE RRC Connected States
Cell_DCH
Dedicated Traffic and Control carried over DCH
Cell_FACH Dedicated Traffic and Control carried over RACH/ FACH
URA_PCH
No air interface resources required, dormant RB
UE receives paging on UTRAN Routing Area (URA) basis rather than
standard routing area (RA); URA usually in the order of 10 cells
C e l l F A C H
C e l l D C HU R A P C H
N o d a t a
N o d a t a
D a t a ac t i v i ty
D a t a
ac t iv i t y
L o w
traf f ic
H igh t r a f f ic
o r C S c a l l
D y n a m i c R B
r e c o n f i g u r e
C e l l F A C H
C e l l D C HU R A P C H
N o d a t a
N o d a t a
D a t a ac t i v i ty
D a t a
ac t iv i t y
L o w
traf f ic
H igh t r a f f ic
o r C S c a l l
D y n a m i c R B
r e c o n f i g u r e
optional
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Paging
Paging type 1:
UE idle mode (no RRC connection) RRC connected modes cell_PCH or URA_PCH
Example: paging for a UE in idle mode
U E N od e B
1 .1
N od e B
2 .1
R N C
1
R N C
2
C N
R A N A PR A N A P
1 . P a g i n g
2 . P C C H : P a g i n g T y p e 1
R A N A P R A N A P1 . P a g i n g
3 . P C C H: P a g i n g T y p e 1
(Requesting CN domain,
IMSI, ...)
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
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Paging
Paging type 2:
UE is in RRC connected mode cell_DCH or cell_FACH
Paging request from another CN domain
Example: paging for a UE in RRC Connected Mode(CELL_DCH or CELL_FACH state)
2 cases:
UTRAN coordinates the paging request with the existing RRC connection (given example)
UE coordinates the paging request with the existing RRC connection
U E S e r v i n g
R N C
C N
R R CR R C
2 . D C C H: P a g i n g T y p e 2
R A N A P R A N A P1 . Pa g i n g
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
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RRC Connection Setup
Establishment of a RRC connection in cell_DCH mode
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
U E N o d e B R N C C N
U E _ I d l e
C E L L _ D C H
In i t i a l R an d o m Acces s
C C C H ( T M ) / R A C H : R R C C o n n e ct io n R e q u e s t
R L S e t u p R e q u e s t
R L S e t u p R e s p o n s e
A L C A P I u b T r a n s p o r t b e a r e r S e tu p
U L / D L S y n c h r o n i s a ti o n
C C C H ( U M ) / F A C H : R R C C o n n e c t io n S e t up
D C C H ( A M ) / D C H : R R C C o n n e c t i on S e tu p C o m p l e t e A d d r . : b y D C H
D C C H e s t ab l is h e d
UE cap ab i l i t ie s
k n o w n
Ad d r . : I n i ti a l UE ID
R e q u e s t fo r D C C H
In c l . E s t ab l i sh m en t
c a u s e
E s t ab l i s h m en t
o f U T R A N
D C H r e s o u r c e s
i n c l. C A C
Ad d r . : I n i t ia l UE ID
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Initial Random Access
UE addressing
CCCH: UE ID embedded in the RRC message
DTCH/ DCCH: UE ID included in MAC header
U E N o d e B Con t ro l l i ng
R N C
P r e a m b l e
P r e a m b l e
P r e a m b l e
A c q u is iti o n In d ic a ti o n (A IC H )
P R A C H M e s s a g e
R e s o u r c i n g N o d e B
H a r d w a r e
R A C H F P
R A C H M e s s ag e
[ R R C C o n n e c t i o n R e q u e s t ]
C R C C h e c k
R A C H F P
P e r s i s t e n c y
c h e c k b e f o r e
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RRC Connection Setup
Reasons for RRC connection setup:
Call setup (mobile-originated and mobile-terminated calls)
Conversational call Streaming call
Interactive call
Background call
Emergency call
Call re-establishment
Exchange of signaling messages (low/high priority)
RRC connection request message contains, e.g.
IMSI, TMSI, IMEI Location area, routing area identity, etc.
Other information: e.g. HSDPA/ E-DCH UE capability, standards release
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NAS Signaling Connection Establishment(Transaction Reasoning)
U E S e r vin g
R N C
C N
1 . R R C C o n n e c t io n E s t a b l is h m e n t
R R CR R C
2 . D C C H : In i t i a l Di re c t T r a n s fe r
R A N A P R A N A P
3 . I n i t ia l U E M e s s a g e
Payload contains system network message:
Information about the transaction initiated bythe UE (IMSI, TMSI, location area, kind of
requested transaction)
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
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Authentication and Security Control
Authentication request/response: mutual authentication of UE and network
Security mode command/complete: CN domain indicates to UTRAN and UE the encryptiondetails (method/algorithms and encryption keys)
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
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Transition Setup and RAB Establishment(CS Mode)
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
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Transition Setup and RAB Establishment(PS Mode)
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
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RAB Establishment
Example: Synchronised establishment of a RAB on DCH
R A B A s s i g n m e n t R e s p o n s e
R a d i o B e a r e r S e t u p C o m p l e te
R a d i o B e a r e r S e t u p
R a d i o L i n k R e c o n f i g u r a ti o n C o m m i t
R ad i o L i n k R eco n f i g u ra t i o n R ead y
R ad i o L i n k R eco n f i g u ra t i o n P rep a re
R A B A s s i g n m e n t
C NS R N CN o d e BU E
A L C A P I u T r a n s p o r t B e a r e r E s ta b l is h m e n t
A L C A P I u b T r a n s p o r t B e a r e r E s ta b l is h m e n t
N o d e B R N C D a t a T r a n sp o r t B e a r e r S y n c
C e l l _ D C H
Act i v a t i o n T i m e ,
TA cti va ti on
C e l l _ D C H /
C e l l _ F A C H W h e n C S C NW h e n C e l l_ F A C H :
R L S e t u p
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Transaction Release and RAB Release(CS Mode)
Note: signaling connection and RRC connection remains
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
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Transaction Release and Iu Release(CS Mode)
Note: signaling connection and RRC connection are released
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
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Transaction Release and RAB Release(PS Mode)
Note: signaling connection and RRC connection remain
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
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Transaction Release and Iu Release(PS Mode)
Note: signaling connection and RRC connection are released
Paging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
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RRC Connection ReleasePaging
RRC Connection Establishment
Transaction Reasoning(Signaling conn. establishment)
Authentication andSecurity
Transaction Setup andRAB Allocation
Transaction(user or control plane)
Transaction Release andRAB Release
RRC Connection Release
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RRC Connection Release (involving DRNC)
Example: RRC connection release of a dedicated channel in soft HO modewith DRNC
1 0 . Rad io L in k D ele t io n Resp o n se
8 . Rad io L in k D ele t io n
9 . Rad io L in k D ele t io n Resp o n se
6 . Rad io L in k D ele t io n
5 . R R C C o n n e c t io n R e l e a s e C o m p l e t e
4 . R R C C o n n e c t io n R e l e a s e
1 1 . Rad io L in k D ele t io n Resp o n se
7 . Rad io L in k D ele t io n
U E N o de B D ri ft R N S
N o d e B S e r v i n g R N S
Drif tR N C
S er v in gR N C
C N
R R C
R R C R R C
N B A P
N B A P
R N S A P
N B A P N B A P
N B A P
R N S A P
R A N A P
R A N A P
3 . A L C A P I u B e a r e r R e l e a s e
A L C A P I u r B e a r e r
Re lease
1 3 . A L C A P I u b B e a r e r R e l e a s e
1 2 . A L C A P I u b B e a r e r R e l e as e
1 . I u R e l e a se C o m m a n d
2 . I u Re lease Co mp le te
R R C
R A N A P
N B A P
R N S A P
N B A P
N B A P
R N S A P
R A N A P
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Soft Handover Radio Link Addition
U E S R N CT a r g e t
N o d e BD R N C
A L C A P I u r b e a re r S e tu p
A c t i v e S e t U p d a t e ( R a d i o L i n k A d d i t io n )
A L C A P I u b D a t a T r a n s p o r t be a r e r S e tu p
R N C D e c i d es t o
a d d a n e w R a d i o
L i n k
T a r g e t N o d e B i s
e a d y
UE s t a r t s
R x o n n e w
a d io l i n k
E . g . n e w
e ig h b o u r c e l l l i s t
R a d i o L i n k R e s t o r e I n d i c a t io nR a d i o L i n k R e s t o r e In d i c a t i o n
A c t i v e S e t U p d a t e C o m p l e t e
M e a s u re m e n t C o n t r o l
s t ar t Rx
s t a rt T x
W h e n R L S e t up
R a d i o L i n k A d d / S e t u p R e q u e s t
R a d i o L i n k A d d / S e t u p R e s p o n s e
R a d i o L i n k A d d / S e t u p R e q u e s t
R a d i o L i n k A d d / S e t u p R e s p o n s e
Unsynchronized addition
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Soft Handover Radio Link Deletion
UE SRNCNode B DRNC
Free-up resources of
old NodeB
Active Set Update (Radio Link Deletion)
UE stopsRx on old
radio link
E.g. new
neighbour cell list
Active Set Update Complete
Measurement Control
Radio Link Deletion Request
ALCAP Iur bearer ReleaseALCAP Iub Data Transport bearer Release
RNC Decides todelete an existing
Radio Link
Radio Link Deletion Request
Radio Link Deletion ResponseRadio Link Deletion Response
stop Rx & Tx
Unsynchronized deletion
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Inter-system Handover (UMTS to GSM)
U E 2 G M S CS R N C 3 G M S C
C h a n n e l a c t i v a ti o n
r o c e d u r e i n B S S
R e l o c a t io n R e q u i r e d
U E s w i t ch e s
o G S M B S S
H O C o m p l e te
M A P P r e p a r e H O R e s p o n s e
R N C D e c i d e s to
e r fo r m H O t o
G S M
H O f r o m U T R A N C o m m a n d
B S C
M A P P r e p ar e H O R e q .
H O R e q u e s t
H O R e q u e s t A C K
R e l o c a t i o n C o m m a n d
R a d i o L i n k F a i lu r e i n U T R A N a n d R a d i o L i n k E s ta b l is h m e n t i n G S M B S S
Iu Re leas e P rocedure
H O C o m p l e te
M A P S e n d E n d S i g n a l R e q .
F r e e u p o f
R e s o u r c e s
M A P S e n d E n d S i g n a l R e s p .
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UTRAN Initiated UMTS-GPRS Cell Reselection
U E S G S NS erv ingR N C
R A N A P R A N A P6 . I u R e le a s e C o m m a n d
R A N A P R A N A P7 . I u R e l e as e C o m p l e t e
R R C R R C
2 . C e l l C h a n g e O r d e r f r o m
U T R A N
3 . T h e U E a c c e s s e s t h e G S M
s ys tem and in i t ia t es rou t ing a r ea
p d a te . T he p a c k e t c o n te x t is
r a n s fe r r e d t o t h e n e w S G S N .
R A N A P R A N A P4 . S R N S C o n t e x t R e q u e s t
R A N A P R A N A P5 . S R N S C o n t e x t R e s p o n s e
1 . U T R A N d e c i s i o n to p e r f o rm C e l l C h a n g e O r d e r fr o m U T R A N :
Most signalling between 2G and 2G CN
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SRNS Relocation (CS)
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URA_PCH to CELL_DCH/ CELL_FACH Transition
Unsynchronised procedure with CRNC = SRNC
U E N o d e B S R N C
C e l l_ D C H : R a d i o B e a r e r R e c o n f i g u ra t io n C o m p l e te ( D C C H A M , D C H )
C e l l_ F A C H : U T R A N M o b i li ty C o n f ir m ( D C C H A M , R A C H )
R a d i o L i n k S e t u p r e q u e s t
UE T r a n s i t i o n s t o
C e l l D C H / s t a y s i n
C e l l _ F A C H
U E S e n d s C o m p l e te
M e s s a g e
L 2 A C K ( D C C H )
R a d i o L i n k S e t u p r e s p o n s e
R a d i o L i n k R e s t o r e I n d i c a ti o nC e l l _ D C H /
C e l l _ F A C H
C e l l U p d a t e C o n f ir m ( C C C H , F A C H , U M )
A L C A P I u b D a t a T r a n s p o r t b e a r e r S e tu p
U R A _ P C H
U E t e m p o r a r y in
C e l l _ F A C HI f C e l l _ D C H
I n c l . D B C c h e c k
F o r e a c h D C H ,
se p a r a t e ly
I n c l. U L / D L S y n c h .
C e l l U p d a t e ( C C C H , R A C H , T M , c a u s e p a g in g r e s p o n s e o r U p l i n k D a t a tr a n s m i s si o n )
R R C S t a t e I n d ic a t o r
C e l l _ D C H /
U R A _ F A C H
TA ct iv at io n
= N O W
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CELL_FACH to CELL_DCH Transition
U E N o d e B R N C C N
R a d i o B e a r e r R e c o n fi g ur a ti o n C o m p l e te ( D C C H A M , D C H )
R a d i o B e a r e r R e c o n fi g u ra ti o n ( D C C H , F A C H )
R a d i o L i n k S e t u p r e q u e s t
R a d i o L i n k S e t u p r e s p o n s e
U E T r a n s i t io n s t o
C e l l D C H
U E S e n d s C o m p l e t e
M e s s a ge o n D C H
L 2 A C K ( D C H )
R N C d e t e rm i n e s U E
shou ld t rans i t ion to
C e l l D C H
R a d i o L i n k R e s t o r e I n d i c a t io n
R N C S t o ps M A C - d
T r a n s m i s s i o n t o U E
C e l l F A C H
C e l l D C H
A L C A P f o r bo th D C H
F P S y n c h
Unsynchronised procedure with CRNC = SRNC
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CELL_DCH to URA_PCH/ CELL_FACH Transition
Unsynchronised procedure with CRNC = SRNC
U E N o d e B S R N C
R a d i o L i n k D e l e t io n R e q u e s t
R R C S t a t e I n d ic a t o r
C e l l _ F A C H /
U R A _ P C H
L 2 A C K ( D C C H , F A C H )
U E S e n d s C o m p l e te
M e s sa g e o n R A C H
R a d i o L i n k D e l e t i o n R e s p o n s e
C e l l _ F A C H /
U R A _ P C H
A L C A P I u b D a t a T r a n s p o r t B e a r e r R e l e as e
C e l l _ D C H
UE t r a n s i t io n s t o
C e l l_ F A C H a n d
e a d s S I B
Fr e e - u p n o n - u se d
D C H R e s o u rc e s
R a d i o B e a r e r R e c o n fi g u ra t io n ( D C C H , D C H , U M )
R a d i o B e a r e r R e c o n fi g u ra t io n C o m p l e te ( D C C H , R A C H , A M )
R N C l e a v e s ti m e
o r L 2 A C K b e in ge r r o r e d
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Dynamic Bearer Reconfiguration
U E S R N C
R a d i o L i n k R e c o n f i g
P r e p a r e
N o d e B
(D r i f t
R N S )
N o d e B
(S erv i n g
R N S )
D R N C
R a d i o L i n k R e c o n f i g u r a t io n P r e p a r e
R a d i o L i n k R e c o n f i g u r a ti o n P r e p a r e
R a d i o L i n k R e c o n f i g u ra t io n R e a d yR a d i o L i n k R e c o n f i g R e a d y
R a d i o L i n k R e c o n f i g u ra t io n R e a d y
A L C A P I u r b e a re r S e tu p
R a d i o L i n k R e c o n f i g
c o m m i t (TA ct iv at io n )R a d i o L i n k R e c o n f i g u ra t io n C o m m i t (TA ct iv at io n )
R a d i o L i n k R e c o n f i g u ra t io n c o m m i t (TA ct iv at io n )
T r a n s p o r t C h a n n e l R e c o n f i g u r a ti o n ( D C C H , A M , TA ct iv at io n )
T r a n s p o rt C h a n n e l R e c o n f ig u r a ti o n C o m p l e te ( D C C H , A M )
A L C A P I u b D a t a T r a n sp o r t b e ar e r R e l ea s e
A L C A P I u b D a t a T r a n s p o r t b e a re r R e l e a s e A L C A P I u r b e a r e r R e le a s e
A L C A P I u b D a t a T r a n s p o r t b e a re r S e tu p
A L C A P I u b D a t a T r a n sp o r t b e ar e r S e tu p
C e l l D C H
C e l l D C H
R N C D e c id e s to
c h a n g e t h e r a t e o f
h e U E
A l l N o d e B s a r e
e a d y
A c t i v a t i o n T i m e
, TA ct iv at io n
U E & N o d e - B
e c o n f i g u r e d t o
h e n e w r a t e s
R e l e a s e t h e t r a n s p o r t
N e tw o rk re so u rc es fo r
h e p r e v i o u s
c o n f i g u r a t i o n
W h e n r a t e i n c r e as e
Synchronised DCH modify w/o transport bearer reconfiguration