09 UTRAN-Procedures JMu

UTRAN Procedures Elementary procedures – Paging g g – 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 I t t h handover d ffrom UMTS to t 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) UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

1

Basic Model of UMTS Network Transactions Paging RRC Connection Establishment Transaction Reasoning (Signaling conn. conn establishment) Authentication and Securityy

UE indicates the CN the requested service

Transaction Setup and RAB Allocation

Allocation All ti off bearers b to t supportt required UMTS bearer service

Transaction (user or control plane)

Transfer of data

Transaction Release and RAB Release RRC Connection Release UMTS Networks

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)

Release of all bearers to support pp UMTS bearer service

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

2

Paging

Paging

RRC Connection Establishment T Transaction ti R Reasoning i (Signaling conn. establishment)

Paging type 1: • UE idle mode ((no RRC connection)) • RRC connected modes cell_PCH or URA_PCH

Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release

Example: paging for a UE in idle mode

UE

N ode d B 1 .1

N ode d B 2 .1

RRC Connection Release

RN C 1

RN C 2

RA N A P

RA N A P

CN

1. Pa gin g

1 . P ag in g

RA N A P

RA N A P

(Requesting CN domain, IMSI, ...) 2 . P C C H : P ag in g T ype 1

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

UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

3

Paging

Paging

RRC Connection Establishment T Transaction ti R Reasoning i (Signaling conn. establishment)

Paging type 2: • UE is in RRC connected mode cell_DCH or cell_FACH • Paging request eq est from f om another anothe CN domain

Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release

Example: p paging p g g for a UE in RRC Connected Mode (CELL_DCH or CELL_FACH state) UE

RRC Connection Release

S erving RNC

RANAP

CN

1.

P aging

RANAP

2 . D C C H : P aging T yp e 2 RRC

RRC

2 cases: • •

UTRAN coordinates the paging request with the existing RRC connection (given example) UE coordinates the paging request with the existing RRC connection

UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

4

Paging

RRC Connection Setup UE

RRC Connection Establishment

RNC

Node B

CN

T Transaction ti R Reasoning i (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation

UE_Idle

Transaction (user or control plane)

Initial Random Access

CCCH (TM)/ RACH: RRC Connection Request RL Setup Request

• Addr.: Initial UE ID • Request for DCCH • Incl. Establishment cause

Transaction Release and RAB Release RRC Connection Release

RL Setup Response

ALCAP Iub Transport bearer Setup

Establishment off UTRAN DCH resources incl. CAC

UL/DL Synchronisation

CCCH (UM)/ FACH: RRC Connection Setup

DCCH (AM)/ DCH: RRC Connection Setup Complete

CELL_DCH

Addr.: Initial UE ID

• Addr.: by DCH • DCCH established • UE capabilities known

Establishment of a RRC connection in cell_DCH mode UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

5

Initial Random Access UE

Persistency check before

Controlling RNC

Node B

Preamble

Preamble

Preamble Resourcing Node B Hardware Acquisition Indication (AICH)

PRACH Message

CRC Check

RACH Message RACHFP

[RRC Connection Request]

RACHFP

UE addressing • CCCH: UE ID embedded in the RRC message • DTCH/ DCCH: UE ID included in MAC header UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

6

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 re-establishment establishment • Exchange of signaling messages (low/high priority) RRC connection ti requestt message contains, t i e.g. • IMSI, TMSI, IMEI • Location area,, routing g area identity, y, etc. • Other information: e.g. HSDPA/ E-DCH UE capability, standards release

UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

7

NAS Signaling Connection Establishment ((Transaction a sact o Reasoning) easo g)

Paging RRC Connection Establishment T Transaction ti R Reasoning i (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

S ervin g RNC

CN

1. R R C C on n ection E sta blish m en t

RRC

2 . D C C H : In itia l D irect T ra n sfer RRC 3 . In itial U E M essag e RA NAP

RAN AP

Payload contains system network message: Information about the transaction initiated by the UE (IMSI, TMSI, location area, kind of requested transaction) UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

8

Paging

Authentication and Security Control

RRC Connection Establishment T Transaction ti R Reasoning i (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release

Authentication request/response: mutual authentication of UE and network S Security it mode d command/complete: d/ l t CN domain d i indicates i di t to t UTRAN and d UE the th encryption ti details (method/algorithms and encryption keys) UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

9

Transition Setup and RAB Establishment (CS Mode)

Paging RRC Connection Establishment T Transaction ti R Reasoning i (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release

UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

10

Transition Setup and RAB Establishment (PS Mode)

Paging RRC Connection Establishment T Transaction ti R Reasoning i (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release

UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

11

RAB Establishment UE

NodeB

SRNC

CN RAB Assignment

ALCAP Iu Transport Bearer Establishment

Cell_DCH/ Cell FACH

Radio Link Reconfiguration Prepare

When Cell_FACH: RL Setup

Radio Link Reconfiguration Ready

When CS CN

ALCAP Iub Transport Bearer Establishment Node B – RNC Data Transport Bearer Sync Radio Link Reconfiguration Commit Activation Time , TActivation

Radio Bearer Setup Radio Bearer Setup Complete RAB Assignment Response

Cell DCH

Example: Synchronised establishment of a RAB on DCH

UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

12

Transaction Release and RAB Release (CS Mode)

Paging RRC Connection Establishment T Transaction ti R Reasoning i (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release

Note: signaling connection and RRC connection remains UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

13

Transaction Release and Iu Release (CS Mode)

Paging RRC Connection Establishment T Transaction ti R Reasoning i (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release

Note: signaling connection and RRC connection are released UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

14

Transaction Release and RAB Release (PS Mode)

Paging RRC Connection Establishment T Transaction ti R Reasoning i (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release

Note: signaling connection and RRC connection remain UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

15

Transaction Release and Iu Release (PS Mode)

Paging RRC Connection Establishment T Transaction ti R Reasoning i (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release

Note: signaling connection and RRC connection are released UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

16

Paging

RRC Connection Release

RRC Connection Establishment T Transaction ti R Reasoning i (Signaling conn. establishment) Authentication and Security Transaction Setup and RAB Allocation Transaction (user or control plane) Transaction Release and RAB Release RRC Connection Release

UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

17

RRC Connection Release (involving DRNC) Example: RRC connection release of a dedicated channel in soft HO mode with DRNC UE

N ode B D rift ift R N S

N ode B S ervin i g RNS

D rift RNC

S erving RNC

CN

1 . Iu R elease C o m m and RANAP

RANAP 2 . Iu R elease C o m p lete

RANAP

RANAP

3 . A L C A P Iu B earer R elease 4 . R R C C o nnectio n R elease

RRC

RRC

5 . R R C C o nnectio n R elease C o m p lete RRC

RRC

NBAP

6 . R ad io L ink D eletio n

N B AP

7 . R ad io L ink D eletio n RNSAP

NBAP

8 . R ad io L ink D eletio n

NBAP

NBAP

1 0 . R ad io L ink D eletio n R esp o nse

RN S AP

NBAP 9 . R ad io L ink D eletio n R esp o nse

N B AP

NBAP 1 1 . R ad io L ink D eletio n R esp o nse RNSAP RN S AP

1 2 . A L C A P Iu b B earer R elease

1 3 . A L C A P Iu b B earer R elease

UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

A L C A P Iu r B earer R elease

November 2009

18

Soft Handover – Radio Link Addition UE

Target Node B

DRNC

Radio Link Add/ Setup Request

SRNC

Radio ad o Link Add/ dd/ Setup Request equest

RNC Decides to add a new Radio Link

start Rx Radio Link Add/ Setup Response Radio Link Add/ Setup Response When RL Setup

ALCAP Iub Data Transport bearer Setup Radio Link Restore Indication

ALCAP Iur bearer Setup

Radio Link Restore Indication Target Node B is ready

start Tx Active Set Update (Radio Link Addition)

Active Set Update Complete UE starts Rx on new radio link

E.g. new neighbour cell list

Measurement Control

Unsynchronized addition UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

19

Soft Handover – Radio Link Deletion UE

DRNC

Node B

SRNC

RNC Decides to delete an existing Radio Link

Active Set Update (Radio Link Deletion)

Active Set Update p Complete p UE stops Rx on old radio link

E.g. new neighbour cell list

Measurement Control

Radio Link Deletion Request

Radio Link Deletion Request

Free-up resources of old NodeB

stop Rx & Tx Radio Link Deletion Response

A CA Iub ALCAP b Data Transport bbearer Release l

Radio Link Deletion Response

A CA Iur bbearer Release ALCAP l

Unsynchronized deletion UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

20

Inter-system Handover (UMTS to GSM) UE

SRNC

RNC Decides to perform HO to GSM

3G MSC

Relocation Required

BSC

2G MSC

MAP Prepare HO Req. HO Request

HO Request q ACK

Channel activation procedure in BSS

MAP Prepare HO Response Relocation Command UE switches to GSM BSS

HO from UTRAN Command

Radio Link Failure in UTRAN and Radio Link Establishment in GSM BSS HO Complete HO Complete MAP Send End Signal Req. Free up of Resources

Iu Release Procedure MAP Send End Signal Resp.

UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

21

UTRAN Initiated UMTS-GPRS Cell Reselection UE

Serving RNC

SGSN

1. UTRAN decision to perform Cell Change Order from UTRAN: 2 Cell 2. C ll Change Ch Order O d from f UTRAN RRC

RRC

3. The UE accesses the GSM system and initiates routing area update. The packet context is transferred to the new SGSN.

RANAP

RANAP

RANAP

RANAP

4. SRNS Context Request

5. SRNS Context Response

6 Iu 6. I Release R l Command C d

7. Iu Release Complete

RANAP

RANAP

RANAP

RANAP

Most signalling between 2G and 2G CN UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

22

SRNS Relocation (CS)

UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

23

UE RRC Connected States optional

Cell FACH

Data activity

High traffic or CS call No data

L Low traffic Dynamic RB reconfigure

No data URA PCH

Cell DCH Data activity

• • •

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

UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

24

URA_PCH to CELL_DCH/ CELL_FACH Transition UE

Node B

SRNC

URA PCH Cell Update (CCCH, RACH, TM, cause “paging response” or ”Uplink Data transmission”)

UE temporary in C ll FACH Cell_FACH

Radio Link Setup request

If Cell_DCH Incl. DBC check

Radio Link Setup response ALCAP Iub Data Transport bearer Setup UE Transitions to Cell DCH/ stays in Cell_FACH

Cell Update Confirm(CCCH, FACH, UM)

Radio Link Restore Indication

Cell_DCH/ Cell_FACH

For each DCH, separately t l Incl. UL/ DL Synch. RRC State Indicator Cell_DCH/ URA FACH URA_FACH TActivation = ‘NOW’

Cell_DCH: Radio Bearer Reconfiguration Complete (DCCH AM, DCH) UE Sends Complete Message

C ll FACH UTRAN M Cell_FACH: Mobility bili Confirm C fi (DCCH AM, AM RACH) L2 ACK (DCCH)

Unsynchronised procedure with CRNC = SRNC UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

25

CELL_FACH to CELL_DCH Transition

UE

Node B

Cell FACH

RNC Radio Link Setup request Radio Link Setup response

CN

RNC determines UE should transition to Cell DCH

ALCAP for both DCH FP Synch UE Transitions to Cell DCH

Radio Bearer Reconfiguration (DCCH, FACH)

R di Link Radio Li k Restore R Indication I di i

C ll DCH Cell UE Sends Complete Message on DCH

RNC Stops MAC-d Transmission to UE

Radio Bearer Reconfiguration Complete (DCCH AM, DCH) L2 ACK (DCH)

Unsynchronised procedure with CRNC = SRNC UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

26

CELL_DCH to URA_PCH/ CELL_FACH Transition UE

Node B

SRNC

Cell DCH Radio Bearer Reconfiguration (DCCH, DCH, UM) UE transitions to Cell_FACH and reads SIB

RRC State Indicator Cell_FACH/ URA_PCH

Radio Bearer Reconfiguration Complete(DCCH, RACH, AM)

UE Sends Complete Message on RACH

RNC leaves time for L2 ACK being errored

L2 ACK (DCCH, FACH)

Cell_FACH/ URA_PCH Radio Link Deletion Request

Radio Link Deletion Response

Free-up non-used DCH Resources

ALCAP Iub Data Transport Bearer Release

Unsynchronised procedure with CRNC = SRNC UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

27

Dynamic Bearer Reconfiguration UE Cell DCH

Node B (Drift RNS)

Node B (Serving RNS)

DRNC

R di Link Radio Li k Reconfiguration R fi ti Prepare P

SRNC Radio Link Reconfig Prepare

RNC Decides to change the rate of the UE

Radio Link Reconfiguration Prepare Radio Link Reconfiguration Ready

Radio Link Reconfig Ready Radio di Link i k Reconfiguration fi i Ready d

ALCAP Iub Data Transport bearer Setup

ALCAP Iur bearer Setup

ALCAP Iub Data Transport bearer Setup

Radio Link Reconfiguration Commit (TActivation) Activation Time

, TActivation

Radio Link Reconfig commit (TActivation)

When rate increase

All Node B’s are ready

Radio Link Reconfiguration g commit ((TActivation) Transport Channel Reconfiguration (DCCH, AM, TActivation)

UE & Node-B reconfigured to the new rates

Cell DCH

Transport Channel Reconfiguration Complete (DCCH, AM) ALCAP Iub Data Transport bearer Release

ALCAP Iur bearer Release

Release the transport Network resources for the h previous i configuration

ALCAP Iub Data Transport bearer Release

Synchronised DCH modify w/o transport bearer reconfiguration UMTS Networks

Andreas Mitschele-Thiel, Jens Mueckenheim

November 2009

28