UTRAN Procedures - Startseite TU Ilmenau · PDF fileUTRAN Procedures Elementary procedures ......

UMTS Networks 1 Oliver Waldhorst, Jens Mueckenheim Oct-11

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 release

RRM procedures – Radio link addition and deletion – Intersystem handover from UMTS to GSM (CS/PS) – UE state transitions/ bearer reconfiguration

MM procedures -> see MM slides CM procedures -> see CM slides References:

– Kaaranen ch. 10 (simple cases discussed here) – 3GPP TR 25.931 (more complicated cases)


Basic Model of UMTS Network Transactions

Paging

RRC Connection Establishment

Transaction Reasoning (Signaling conn. establishment)

Authentication and Security

Transaction Setup and RAB Allocation

Transaction (user or control plane)

Transaction Release and RAB Release

RRC Connection Release

UE indicates the CN the requested service

A transaction comprises all the elementary procedures required to enable

– the transport of user data (PS or CS mode) or

– the exchange of higher-layer signaling messages (e.g. MM or CM)

Allocation of bearers to support required UMTS bearer service

Transfer of data

Release of all bearers to support UMTS bearer service


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 ll F A C H

C e ll D C HU R A P C H

N o d a ta

N o d a ta

D a ta a c tiv ity

D a ta

a c tiv ity

L o w

tra ff ic

H ig h tra ff ic

o r C S c a ll

D y n a m ic R B

re c o n f ig u re

C e ll F A C H

C e ll D C HU R A P C H

N o d a ta

N o d a ta

D a ta a c tiv ity

D a ta

a c tiv ity

L o w

tra ff ic

H ig h tra ff ic

o r C S c a ll

D y n a m ic R B

re c o n f ig u re

optional


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 o d e B

1 .1

N o d 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 in g

2 . P C C H : P a g in g T yp e 1

R A N A P R A N A P1 . P a g in g

3 . P C C H : P a g in g T yp e 1

(Requesting CN domain,

IMSI, ...)

Paging









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 rv in g

R N C

C N

R R C R R C

2 . D C C H : P a g in g T y p e 2

R A N A P R A N A P 1 . P a g in g

Paging









RRC Connection Setup

Establishment of a RRC connection in cell_DCH mode

Paging








U E N o d e B R N C C N

U E _ Id le

C E L L _ D C H

In it ia l R a n d o m A c c e ss

C C C H (T M )/ R A C H : R R C C o n n e c tio n R e q u e s t

R L S e tu p R e q u e s t

R L S e tu p R e sp o n se

A L C A P Iu b T ra n sp o rt b e a re r S e tu p

U L /D L S y n c h ro n isa tio n

C C C H (U M )/ F A C H : R R C C o n n e c tio n S e tu p

D C C H (A M )/ D C H : R R C C o n n e c tio n S e tu p C o m p le te A d d r.: b y D C H

D C C H e s ta b lish e d

U E c a p a b ilit ie s

k n o w n

A d d r.: In i t ia l U E ID

R e q u e s t fo r D C C H

In c l. E s ta b lish m e n t

c a u se

E s ta b lish m e n t

o f U T R A N

D C H re so u rc e s

in c l. C A C

A d d r.: In i t ia l U E ID


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

C o n tro ll in g

R N C

P re a m b le

P re a m b le

P re a m b le

A c q u is it io n In d ic a t io n (A IC H )

P R A C H M e s s a g e

R e s o u rc in g N o d e B

H a rd w a re

R A C H F P

R A C H M e s s a g e

[R R C C o n n e c t io n R e q u e s t]

C R C C h e c k

R A C H F P

P e rs is te n c y

c h e c k b e fo re


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


NAS Signaling Connection Establishment (Transaction Reasoning)

U E S er v in g

R N C

C N

1 . R R C C o n n ec tio n E s ta b l ish m en t

R R CR R C

2 . D C C H : In i t ia l D ir ec t T r a n sfe r

R A N A P R A N A P

3 . In i t ia l U E M essa g e

Payload contains system network message:

Information about the transaction initiated by the UE (IMSI, TMSI, location area, kind of requested transaction)

Paging









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 encryption details (method/algorithms and encryption keys)

Paging









Transition Setup and RAB Establishment (CS Mode)

Paging









Transition Setup and RAB Establishment (PS Mode)

Paging









RAB Establishment

Example: Synchronised establishment of a RAB on DCH

R A B A ss ig n m e n t R e sp o n se

R a d io B e a re r S e tu p C o m p le te

R a d io B e a re r S e tu p

R a d io L in k R e c o n fig u ra tio n C o m m it

R a d io L in k R e c o n fig u ra tio n R e a d y

R a d io L in k R e c o n fig u ra tio n P re p a re

R A B A ss ig n m e n t

C N S R N C N o d e B U E

A L C A P Iu T ra n sp o rt B e a re r E s ta b lish m e n t

A L C A P Iu b T ra n sp o rt B e a re r E s ta b lish m e n t

N o d e B – R N C D a ta T ra n sp o rt B e a re r S y n c

C e ll_ D C H

A c tiv a t io n T im e ,

T A c tiv a t io n

C e ll_ D C H /

C e ll_ F A C H W h e n C S C N W h e n C e ll_ F A C H :

R L S e tu p


Transaction Release and RAB Release (CS Mode)

Note: signaling connection and RRC connection remains

Paging









Transaction Release and Iu Release (CS Mode)

Note: signaling connection and RRC connection are released

Paging









Transaction Release and RAB Release (PS Mode)

Note: signaling connection and RRC connection remain

Paging









Transaction Release and Iu Release (PS Mode)

Note: signaling connection and RRC connection are released

Paging









RRC Connection Release Paging









RRC Connection Release (involving DRNC)

Example: RRC connection release of a dedicated channel in soft HO mode with DRNC

1 0 . R a d io L in k D e le t io n R e sp o n se

8 . R a d io L in k D e le t io n

9 . R a d io L in k D e le t io n R e sp o n se


5 . R R C C o n n e c t io n R e le a se C o m p le te

4 . R R C C o n n e c t io n R e le a se

1 1 . R a d io L in k D e le t io n R e sp o n se


U E N o d e B D rif t R N S

N o d e B S e rv in g R N S

D rift R N C

S e rv in g R 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 Iu B e a re r R e le a se

A L C A P Iu r B e a re r

R e le a se 1 3 . A L C A P Iu b B e a re r R e le a se

1 2 . A L C A P Iu b B e a re r R e le a se

1 . Iu R e le a se C o m m a n d

2 . Iu R e le a se C o m p 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


Soft Handover – Radio Link Addition

U E S R N C

T a rg e t

N o d e B D R N C

A L C A P Iu r b e a re r S e tu p

A c tiv e S e t U p d a te (R a d io L in k A d d itio n )

A L C A P Iu b D a ta T ra n sp o r t b e a re r S e tu p

R N C D e c id e s to

a d d a n e w R a d io

L in k

T a rg e t N o d e B is

re a d y

U E s ta r ts

R x o n n e w

ra d io l in k

E .g . n e w

n e ig h b o u r c e ll l is t

R a d io L in k R e s to re In d ic a tio n R a d io L in k R e s to re In d ic a tio n

A c tiv e S e t U p d a te C o m p le te

M e a su re m e n t C o n tro l

s ta r t R x

s ta r t T x

W h e n R L S e tu p

R a d io L in k A d d / S e tu p R e q u e s t

R a d io L in k A d d / S e tu p R e sp o n se

R a d io L in k A d d / S e tu p R e q u e s t

R a d io L in k A d d / S e tu p R e sp o n se

Unsynchronized addition


Soft Handover – Radio Link Deletion

UE SRNC Node B DRNC

Free-up resources of

old NodeB

Active Set Update (Radio Link Deletion)

UE stops

Rx on old

radio link

E.g. new

neighbour cell list

Active Set Update Complete

Measurement Control

Radio Link Deletion Request

ALCAP Iur bearer Release ALCAP Iub Data Transport bearer Release

RNC Decides to

delete an existing

Radio Link

Radio Link Deletion Request

Radio Link Deletion Response Radio Link Deletion Response

stop Rx & Tx

Unsynchronized deletion


Inter-system Handover (UMTS to GSM)

U E 2 G M S C S R N C 3 G M S C

C h a n n e l a c tiv a tio n

p ro c e d u re in B S S

R e lo c a tio n R e q u ire d

U E sw itc h e s

to G S M B S S

H O C o m p le te

M A P P re p a re H O R e sp o n se


p e rfo rm H O to

G S M

H O fro m U T R A N C o m m a n d

B S C

M A P P re p a re 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 lo c a tio n C o m m a n d

R a d io L in k F a ilu re in U T R A N a n d R a d io L in k E s ta b lis h m e n t in G S M B S S

Iu R e le a se P ro c e d u re

H O C o m p le te

M A P S e n d E n d S ig n a l R e q .

F re e u p o f

R e so u rc e s

M A P S e n d E n d S ig n a l R e sp .


UTRAN Initiated UMTS-GPRS Cell Reselection

U E S G S N S e rv in g

R N C

R A N A P R A N A P 6 . Iu R e le a se C o m m a n d

R A N A P R A N A P 7 . Iu R e le a se C o m p le te

R R C R R C

2 . C e ll C h a n g e O rd e r fro m

U T R A N

3 . T h e U E a c c e sse s th e G S M

s y s te m a n d in i tia te s ro u t in g a r e a

u p d a te . T h e p a c k e t c o n te x t is

tra n s fe r re d to th e n e w S G S N .

R A N A P R A N A P 4 . S R N S C o n te x t R e q u e s t

R A N A P R A N A P 5 . S R N S C o n te x t R e sp o n se

1 . U T R A N d e c is io n to p e r fo rm C e l l C h a n g e O rd e r fro m U T R A N :

Most signalling between 2G and 2G CN


SRNS Relocation (CS)


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 ll_ D C H : R a d io B e a re r R e c o n fig u ra tio n C o m p le te (D C C H A M , D C H )

C e ll_ F A C H : U T R A N M o b ility C o n fir m (D C C H A M , R A C H )

R a d io L in k S e tu p re q u e s t

U E T ra n s itio n s to

C e ll D C H / s ta y s in

C e ll_ F A C H

U E S e n d s C o m p le te

M e ssa g e

L 2 A C K (D C C H )

R a d io L in k S e tu p re sp o n se

R a d io L in k R e s to re In d ic a tio n C e ll_ D C H /

C e ll_ F A C H

C e ll U p d a te C o n fir m ( C C C H , F A C H , U M )


U R A _ P C H

U E te m p o ra ry in

C e ll_ F A C H If C e ll_ D C H

In c l. D B C c h e c k

F o r e a c h D C H ,

se p a ra te ly

In c l. U L / D L S y n c h .

C e ll U p d a te (C C C H , R A C H , T M , c a u se “ p a g in g re sp o n se ” o r ” U p lin k D a ta tra n s m is s io n ” )

R R C S ta te In d ic a to r

C e ll_ D C H /

U R A _ F A C H

T A c tiv a tio n = ‘N O W ’


CELL_FACH to CELL_DCH Transition

U E N o d e B R N C C N

R a d io B e a re r R e c o n fig u ra tio n C o m p le te (D C C H A M , D C H )

R a d io B e a re r R e c o n fig u ra tio n (D C C H , F A C H )

R a d io L in k S e tu p re q u e s t

R a d io L in k S e tu p re sp o n se

U E T ra n s itio n s to

C e ll D C H


M e ssa g e o n D C H

L 2 A C K (D C H )

R N C d e te rm in e s U E

sh o u ld tran s it io n to

C e ll D C H

R a d io L in k R e s to re In d ic a tio n

R N C S to p s M A C -d

T ra n s m is s io n to U E

C e ll F A C H

C e ll D C H

A L C A P fo r b o th D C H

F P S y n c h



CELL_DCH to URA_PCH/ CELL_FACH Transition


U E N o d e B S R N C

R a d io L in k D e le tio n R e q u e s t

R R C S ta te In d ic a to r

C e ll_ F A C H /

U R A _ P C H

L 2 A C K (D C C H , F A C H )


M e ssa g e o n R A C H

R a d io L in k D e le tio n R e sp o n s e

C e ll_ F A C H /

U R A _ P C H

A L C A P Iu b D a ta T ra n sp o r t B e a re r R e le a se

C e ll_ D C H

U E tra n s it io n s to

C e ll_ F A C H a n d

re a d s S IB

F re e -u p n o n -u se d

D C H R e so u rc e s

R a d io B e a re r R e c o n fig u ra tio n (D C C H , D C H , U M )

R a d io B e a re r R e c o n fig u ra tio n C o m p le te (D C C H , R A C H , A M )

R N C le a v e s t im e

fo r L 2 A C K b e in g

e rro re d


Dynamic Bearer Reconfiguration

U E S R N C

R a d io L in k R e c o n fig

P re p a re

N o d e B

(D r if t

R N S )

N o d e B

(S e rv in g

R N S )

D R N C



R a d io L in k R e c o n fig u ra tio n R e a d y R a d io L in k R e c o n fig R e a d y

R a d io L in k R e c o n fig u ra tio n R e a d y

A L C A P Iu r b e a re r S e tu p

R a d io L in k R e c o n fig

c o m m it (T A c tiv a tio n ) R a d io L in k R e c o n fig u ra tio n C o m m it ( T A c tiv a tio n )

R a d io L in k R e c o n fig u ra tio n c o m m it ( T A c tiv a tio n )

T ra n sp o r t C h a n n e l R e c o n fig u ra tio n (D C C H , A M , T A c tiv a tio n )

T ra n sp o r t C h a n n e l R e c o n fig u ra tio n C o m p le te (D C C H , A M )

A L C A P Iu b D a ta T ra n sp o r t b e a re r R e le a se

A L C A P Iu b D a ta T ra n sp o r t b e a re r R e le a se A L C A P Iu r b e a re r R e le a se



C e ll D C H

C e ll D C H


c h a n g e th e ra te o f

th e U E

A ll N o d e B ’s a re

re a d y

A c tiv a tio n T im e

, T A c tiv a tio n

U E & N o d e -B

re c o n fig u re d to

th e n e w ra te s

R e le a se th e tra n sp o r t

N e tw o rk re so u rc e s fo r

th e p re v io u s

c o n fig u ra tio n

W h e n ra te in c re a se

Synchronised DCH modify w/o transport bearer reconfiguration

UTRAN Procedures - Startseite TU Ilmenau · PDF fileUTRAN Procedures Elementary procedures ......

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