09 UTRAN-Procedures JMu

(1)

UTRAN Procedures

Elementary procedures

– Paging

g g

– RRC connection setup

– Transaction reasoning

– Authentication and security control

Authentication and security control

– Transaction setup with RAB allocation

– Transaction clearing and RAB release

– RRC connection release

RRM procedures

– Radio link addition and deletion

I t

t

h d

f

UMTS t GSM (CS/PS)

– Intersystem handover from UMTS to GSM (CS/PS)

– UE state transitions/ bearer reconfiguration

MM procedures > see MM slides

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)

(2)

Basic Model of UMTS Network Transactions

Paging

RRC Connection Establishment

A transaction comprises all the elementary

procedures required to enable

– the transport of user data (PS or CS

RRC Connection Establishment

Transaction Reasoning

(Signaling conn establishment)

mode) or

– the exchange of higher-layer signaling

messages (e.g. MM or CM)

(Signaling conn. establishment)

Authentication and

Security

y

_{UE indicates the CN}

Transaction Setup and

RAB Allocation

UE indicates the CN

the requested service

All

ti

f b

t

Transaction

(user or control plane)

Allocation of bearers to support

required UMTS bearer service

Transaction Release and

RAB Release

Transfer of data

Release of all bearers to support

RRC Connection Release

pp

UMTS bearer service

(3)

Paging

Paging

RRC Connection Establishment T ti R i

Paging type 1:

• UE idle mode (no RRC connection)

Transaction Reasoning (Signaling conn. establishment)

Authentication and Security Transaction Setup and

RAB Allocation

(

)

• RRC connected modes cell_PCH or URA_PCH

Example: paging for a UE in idle mode

Transaction (user or control plane) Transaction Release and

RAB Release RRC Connection Release

Example: paging for a UE in idle mode

U E N d B N d B R N C R N C C N RRC Connection Release 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 P 1 . P a g in g R A N A P R A N A P R A N A P 1 . P a g in g 2 . P C C H : P a g in g T yp e 1 (Requesting CN domain, IMSI, ...) 3 . P C C H : P a g in g T yp e 1

(4)

Paging

Paging

Paging type 2:

• UE is in RRC connected mode cell_DCH or cell_FACH

Paging eq est f om anothe CN domain

Transaction Reasoning (Signaling conn. establishment)

RAB Allocation

• Paging request from another CN domain

Example: paging for a UE in RRC Connected Mode

p

p g g

(CELL_DCH or CELL_FACH state)

U E S e rv in g R N C C N RRC Connection Release R N C R A N A P 1 . P a g in g R A N A P R R C R R C 2 . D C C H : P a g in g T yp e 2

2 cases:

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

• UE coordinates the paging request with the existing RRC connection

(5)

RRC Connection Setup

Paging

RRC Connection Establishment

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

RAB Allocation

UE

Node B

RNC

CN

UE_Idle

Initial Random Access

CCCH (TM)/ RACH: RRC Connection Request

• Addr.: Initial UE ID • Request for DCCH

• Incl. Establishment _{RRC Connection Release} RL Setup Request

RL Setup Response

cause

Establishment f UTRAN ALCAP Iub Transport bearer Setup

UL/DL Synchronisation

of UTRAN DCH resources incl. CAC

CCCH (UM)/ FACH: RRC Connection Setup Addr.: Initial UE ID

CELL_DCH

DCCH (AM)/ DCH: RRC Connection Setup Complete

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

known

(6)

Initial Random Access

UE

Node B

Controlling RNC Preamble Preamble Preamble Persistency check before Preamble

Acquisition Indication (AICH)

Resourcing Node B Hardware PRACH Message CRC Check RACHFP RACH Message [RRC Connection Request] RACHFP

UE addressing

• CCCH: UE ID embedded in the RRC message

(7)

RRC Connection Setup

Reasons for RRC connection setup:

• Call setup (mobile-originated and mobile-terminated calls)

– Conversational call

Conversational call

– Streaming call

– Interactive call

– Background call

– Emergency call

– Call re-establishment

Call re establishment

• Exchange of signaling messages (low/high priority)

RRC

ti

t

t i

RRC connection request message contains, e.g.

• IMSI, TMSI, IMEI

• Location area, routing area identity, etc.

,

g

y,

(8)

NAS Signaling Connection Establishment

(Transaction Reasoning)

Paging

RRC Connection Establishment

T ti R i

(

a sact o

easo

g)

_{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 U E S er vin g R N C C N RRC Connection Release

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

2 D C C H : In itia l D ir ect T r a n sfer

R R C R R C 2 . D C C H : In itia l D ir ect T r a n sfer

R A N A P R A N A P 3 . In itia 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)

(9)

Authentication and Security Control

Paging

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

Authentication and Security

Transaction Setup and RAB Allocation

RAB Release RRC Connection Release RRC Connection Release

Authentication request/response: mutual authentication of UE and network

S

it

d

d/

l t CN d

i i di t

t UTRAN

d UE th

ti

Security mode command/complete: CN domain indicates to UTRAN and UE the encryption

details (method/algorithms and encryption keys)

(10)

Transition Setup and RAB Establishment

(CS Mode)

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

Authentication and Security

Transaction Setup and RAB Allocation

(11)

Transition Setup and RAB Establishment

(PS Mode)

Authentication and Security

Transaction Setup and RAB Allocation

(12)

RAB Establishment

CN

SRNC

NodeB

UE

Radio Link Reconfiguration Prepare

RAB Assignment

ALCAP Iu Transport Bearer Establishment

Cell_DCH/

Cell FACH

When Cell_FACH: When CS CN

Radio Link Reconfiguration Ready ALCAP Iub Transport Bearer Establishment

Node B – RNC Data Transport Bearer Sync

Cell FACH

When CS CN

RL Setup

Radio Bearer Setup Complete Radio Bearer Setup

Radio Link Reconfiguration Commit Activation Time ,

TActivation

RAB Assignment Response

Cell DCH

Example: Synchronised establishment of a RAB on DCH

(13)

Transaction Release and RAB Release

(CS Mode)

Paging

(CS Mode)

Transaction Reasoning

RAB Allocation Transaction (user or control plane)

Transaction Release and RAB Release

RRC Connection Release RRC Connection Release

(14)

Transaction Release and Iu Release

(CS Mode)

Transaction Release and RAB Release RRC Connection Release RRC Connection Release

(15)

Transaction Release and RAB Release

(PS Mode)

Paging

(PS Mode)

Transaction Reasoning

Transaction Release and RAB Release

RRC Connection Release RRC Connection Release

(16)

Transaction Release and Iu Release

(PS Mode)

Transaction Release and RAB Release RRC Connection Release RRC Connection Release

(17)

RRC Connection Release

Paging

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

RAB Allocation Transaction (user or control plane) Transaction Release and

RAB Release

RRC Connection Release RRC Connection Release

(18)

RRC Connection Release (involving DRNC)

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

with DRNC

U E N o d e B D ift R N S N o d e B S i R N S D rift R N C S erving R N C C N D rift R N S S ervin g R N S R N C R N C R A N A P R A N A P 1 . Iu R elease C o m m and 2 . Iu R elease C o m p lete R A N A P R A N A P

5 . R R C C o nnectio n R elease C o m p lete 4 . R R C C o nnectio n R elease R R C R R C R R C 3 . A L C A P Iu B earer R elease R R C 6 . R ad io L ink D eletio n 7 . R ad io L ink D eletio n R R C R R C N B A P R N S A P N B A P R N S A P

1 0 . R ad io L ink D eletio n R esp o nse 8 . R ad io L ink D eletio n

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

N B A P N B A P N B A P N B A P N B A P N B A P

1 1 . R ad io L ink D eletio n R esp o nse N B A P R N S A P 1 2 . A L C A P Iu b B earer R elease N B A P R N S A P A L C A P Iu r B earer R elease 1 3 . A L C A P Iu b B earer R elease

(19)

Soft Handover – Radio Link Addition

UE Target SRNC

Node B DRNC

RNC Decides to add a new Radio

Radio Link Add/ Setup Request _{add a new Radio}

Link

start Rx

Radio Link Add/ Setup Request

Radio Link Add/ Setup Response

ad o dd/ Setup equest

ALCAP Iur bearer Setup ALCAP Iub Data Transport bearer Setup

Radio Link Restore Indication

When RL Setup

Active Set Update (Radio Link Addition)

Target Node B is ready

Radio Link Restore Indication start Tx

UE starts E.g. new _{neighbour cell list}

Active Set Update Complete

Rx on new radio link

neighbour cell list

Measurement Control

(20)

Soft Handover – Radio Link Deletion

UE Node B DRNC SRNC

Active Set Update (Radio Link Deletion)

Active Set Update Complete

RNC Decides to delete an existing Radio Link UE stops Rx on old radio link E.g. new

neighbour cell list

p p

Measurement Control

Free-up resources of old NodeB

Radio Link Deletion Request Radio Link Deletion Request

A CA b l

A CA b b l

Radio Link Deletion Response

Radio Link Deletion Response stop Rx & Tx

ALCAP Iur bearer Release ALCAP Iub Data Transport bearer Release

(21)

Inter-system Handover (UMTS to GSM)

UE SRNC 3G MSC 2G MSC RNC Decides to BSC Channel activation procedure in BSS Relocation Required RNC Decides to perform HO to

GSM MAP Prepare HO Req.

HO Request

HO Request ACK

UE switches GSM BSS

MAP Prepare HO Response

HO from UTRAN Command

q

Relocation Command

to GSM BSS

HO Complete

Radio Link Failure in UTRAN and Radio Link Establishment in GSM BSS

Iu Release Procedure

HO Complete MAP Send End Signal Req.

Free up of Resources Resources

(22)

UTRAN Initiated UMTS-GPRS Cell Reselection

UE Serving SGSN

RNC

2 C ll Ch O d f

1. UTRAN decision to perform Cell Change Order from UTRAN:

RRC RRC

2. Cell Change Order from UTRAN

3. The UE accesses the GSM

system and initiates routing area RANAP RANAP 4. SRNS Context Request

6 I R l C d system and initiates routing area

update. The packet context is transferred to the new SGSN.

RANAP RANAP

RANAP 5. SRNS Context Response RANAP

RANAP 6. Iu Release Command RANAP

RANAP 7. Iu Release Complete RANAP

(23)

(24)

UE RRC Connected States

Cell FACH

optional

Data

activity

L

High traffic

or CS call

Data

activity

L

High traffic

or CS call

Cell DCH

URA PCH

No data

Low

traffic

Dynamic RB

reconfigure

Cell DCH

URA PCH

No data

Low

traffic

Dynamic RB

reconfigure

• Cell_DCH

Cell DCH

URA PCH

Data activity

Cell DCH

URA PCH

Data activity

– 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

(25)

URA_PCH to CELL_DCH/ CELL_FACH Transition

UE Node B SRNC

URA PCH

UE temporary in C ll FACH

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

Radio Link Setup request

Radio Link Setup response

Cell_FACH If Cell_DCH Incl. DBC check For each DCH, t l UE Transitions to Cell DCH/ stays in Cell_FACH

Cell Update Confirm(CCCH, FACH, UM)

ALCAP Iub Data Transport bearer Setup

separately

Incl. UL/ DL Synch.

RRC State Indicator Cell_DCH/

URA FACH

Cell_DCH: Radio Bearer Reconfiguration Complete (DCCH AM, DCH) C ll FACH UTRAN M bili C fi (DCCH AM RACH)

UE Sends Complete

Cell_DCH/ Cell_FACH

URA_FACH

TActivation = ‘NOW’

Cell_FACH: UTRAN Mobility Confirm (DCCH AM, RACH)

UE Sends Complete Message

L2 ACK (DCCH)

(26)

CELL_FACH to CELL_DCH Transition

UE

Node B

RNC

CN

Radio Link Setup request

Radio Link Setup response

RNC determines UE should transition to

Cell FACH

Radio Link Setup response

Cell DCH

ALCAP for both DCH

Radio Bearer Reconfiguration (DCCH, FACH)

UE Transitions to Cell DCH

R di Li k R

I di

i

RNC Stops MAC-d Transmission to UE

C ll DCH

FP Synch

Radio Bearer Reconfiguration Complete (DCCH AM, DCH)

UE Sends Complete Message on DCH

L2 ACK (DCH)

Radio Link Restore Indication

Cell DCH

(27)

CELL_DCH to URA_PCH/ CELL_FACH Transition

UE Node B SRNC RRC State Indicator Cell_FACH/ URA_PCH Cell DCH UE transitions to Cell FACH and