06 UTRAN-procedures-ws12 [Schreibgeschützt ... · PDF fileURA PCH Cell DCH No data No...

UMTS Networks 1Andreas Mitschele-Thiel, Jens Mueckenheim November 2012

UTRAN ProceduresElementary 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 slidesCM procedures -> see CM slides

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


Basic Model of UMTS Network TransactionsPaging

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 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


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

UE N ode B1.1

N ode B2.1

RN C1

RN C2

C N

RA N A PRA N A P 1. Pagin g

2. PC C H : Pagin g T ype 1

RA N A P RA N A P1. Pagin g

3. PC C H : Pagin g T ype 1

(Requesting CN domain, IMSI, ...)

Paging









PagingPaging 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 Serving

R N C C N

R R C R R C 2 . D C C H : P aging T ype 2

R A N A P R A N A P 1 . P aging

Paging









RRC Connection Setup

Establishment of a RRC connection in cell_DCH mode

Paging








UE Node B RNC CN

UE_Idle

CELL_DCH

Initial Random Access

CCCH (TM)/ RACH: RRC Connection Request

RL Setup Request

RL Setup Response

ALCAP Iub Transport bearer Setup

UL/DL Synchronisation

CCCH (UM)/ FACH: RRC Connection Setup

DCCH (AM)/ DCH: RRC Connection Setup Complete Addr.: by DCH DCCH established UE capabilities

known

Addr.: Initial UE IDRequest for DCCH Incl. Establishment

cause

Establishment of UTRAN DCH resources incl. CAC

Addr.: Initial UE ID


Initial Random Access

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

UE Node B Controlling RNC

Preamble

Preamble

Preamble

Acquisition Indication (AICH)

PRACH Message

Resourcing Node BHardware

RACHFP

RACH Message[RRC Connection Request]

CRC Check

RACHFP

Persistency check before


RRC Connection SetupReasons 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)

UE Servin gRN C

C N

1. RRC C on n ection E stablish m en t

RRCRRC2. D C C H : In itia l D irect T ran sfer

RA N A P RA N A P3. In itia l UE M essage

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 networkSecurity 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

RAB Assignment Response

Radio Bearer Setup Complete

Radio Bearer Setup

Radio Link Reconfiguration Commit

Radio Link Reconfiguration Ready

Radio Link Reconfiguration Prepare

RAB Assignment

CN SRNCNodeBUE

ALCAP Iu Transport Bearer Establishment

ALCAP Iub Transport Bearer Establishment

Node B – RNC Data Transport Bearer Sync

Cell DCH

Activation Time , TActivation

Cell_DCH/ Cell FACH When CS CN When Cell_FACH:

RL Setup


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 ReleasePaging









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

with DRNC

10. R adio L ink D eletio n R espo nse

8. R adio L ink D eletio n

9 . R adio Link D eletio n R espo nse

6 . R adio L ink D eletio n

5. R R C C o nnectio n R elease C o mplete

4 . R R C C o nnectio n R elease

11. R adio Link D eletio n R espo nse

7. R adio L ink D eletio n

U E N o de BD rift R N S

N o de BServing R N S

D rift R N C

ServingR N C

C N

R R C

R R CR R C

N B A P

N B AP

R N SAP

N B A P N B AP

N B A P

R N S AP

R A N AP

R A N AP

3. A LC A P Iu B earer R elease

ALC AP Iur B earer R elease 13. A LC A P Iub B earer R elease

12 . ALC AP Iub B earer R elease

1 . Iu R elease C o mmand

2. Iu R elease C o mplete

R R C

R A N AP

N B AP

R N S AP

N B A P

N B AP

R N SAP

R A N AP


Soft Handover – Radio Link Addition UE SRNC Target

Node B DRNC

ALCAP Iur bearer Setup

Active Set Update (Radio Link Addition)

ALCAP Iub Data Transport bearer Setup

RNC Decides to add a new Radio Link

Target Node B is ready

UE starts Rx on new radio link

E.g. new neighbour cell list

Radio Link Restore IndicationRadio Link Restore Indication

Active Set Update Complete

Measurement Control

start Rx

start Tx

When RL Setup

Radio Link Add/ Setup Request

Radio Link Add/ Setup Response

Radio Link Add/ Setup Request

Radio Link Add/ Setup Response

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 ResponseRadio Link Deletion Response

stop Rx & Tx

Unsynchronized deletion


Inter-system Handover (UMTS to GSM)

UE 2G MSCSRNC 3G MSC

Channel activation procedure in BSS

Relocation Required

UE switches to GSM BSS

HO Complete

MAP Prepare HO Response

RNC Decides to perform HO to GSM

HO from UTRAN Command

BSC

MAP Prepare HO Req.HO Request

HO Request ACK

Relocation Command

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

MAP Send End Signal Resp.

o


UTRAN Initiated UMTS-GPRS Cell Reselection

UE SGSN Serving RNC

RANAP RANAP 6. Iu Release Command

RANAP RANAP 7. Iu Release Complete

RRC RRC

2. Cell Change Order from UTRAN

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

RANAP RANAP 4. SRNS Context Request

RANAP RANAP 5. SRNS Context Response

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

Most signalling between 2G and 2G CN

o


SRNS Relocation (CS)

o


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

Cell FACH

Cell DCHURA PCHNo data

No data

Data activity

Data activity

Low traffic

High trafficor CS call

Dynamic RBreconfigure

Cell FACH

Cell DCHURA PCHNo data

No data

Data activity

Data activity

Low traffic

High trafficor CS call

Dynamic RBreconfigure

optional

o


URA_PCH to CELL_DCH/ CELL_FACH Transition

Unsynchronised procedure with CRNC = SRNC

UE Node B SRNC

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

Cell_FACH: UTRAN Mobility Confirm (DCCH AM, RACH)

Radio Link Setup request

UE Transitions to Cell DCH/ stays in Cell_FACH

UE Sends Complete Message

L2 ACK (DCCH)

Radio Link Setup response

Radio Link Restore Indication Cell_DCH/ Cell_FACH

Cell Update Confirm(CCCH, FACH, UM)


URA PCH

UE temporary in Cell_FACH

If Cell_DCH Incl. DBC check

For each DCH, separately Incl. UL/ DL Synch.

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

RRC State Indicator Cell_DCH/ URA_FACH TActivation = ‘NOW’

o


CELL_FACH to CELL_DCH Transition

UE Node B RNC CN

Radio Bearer Reconfiguration Complete (DCCH AM, DCH)

Radio Bearer Reconfiguration (DCCH, FACH)

Radio Link Setup request

Radio Link Setup response

UE Transitions to Cell DCH

UE Sends Complete Message on DCH

L2 ACK (DCH)

RNC determines UE should transition to Cell DCH

Radio Link Restore Indication

RNC Stops MAC-d Transmission to UE

Cell FACH

Cell DCH

ALCAP for both DCH

FP Synch


o


CELL_DCH to URA_PCH/ CELL_FACH Transition


UE Node B SRNC


RRC State Indicator Cell_FACH/ URA_PCH

L2 ACK (DCCH, FACH) UE Sends Complete Message on RACH

Radio Link Deletion Response

Cell_FACH/URA_PCH

ALCAP Iub Data Transport Bearer Release

Cell DCH

UE transitions to Cell_FACH and reads SIB

Free-up non-used DCH Resources

Radio Bearer Reconfiguration (DCCH, DCH, UM)

Radio Bearer Reconfiguration Complete(DCCH, RACH, AM)

RNC leaves time for L2 ACK being errored

o


Dynamic Bearer Reconfiguration UE SRNC

Radio Link Reconfig Prepare

Node B (Drift RNS)

Node B (Serving RNS)

DRNC



Radio Link Reconfiguration Ready Radio Link Reconfig Ready

Radio Link Reconfiguration Ready

ALCAP Iur bearer Setup

Radio Link Reconfig commit (TActivation) Radio Link Reconfiguration Commit (TActivation)

Radio Link Reconfiguration commit (TActivation)

Transport Channel Reconfiguration (DCCH, AM, TActivation)

Transport Channel Reconfiguration Complete (DCCH, AM)

ALCAP Iub Data Transport bearer Release

ALCAP Iub Data Transport bearer Release ALCAP Iur bearer Release



Cell DCH

Cell DCH

RNC Decides to change the rate of the UE

All Node B’s are ready

Activation Time , TActivation

UE & Node-B reconfigured to the new rates

Release the transport Network resources for the previous configuration

When rate increase

Synchronised DCH modify w/o transport bearer reconfiguration

o

06 UTRAN-procedures-ws12 [Schreibgeschützt ... · PDF fileURA PCH Cell DCH No data No...

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