Umts

© Dirk Pesch, 2004 1

Universal Mobile Telecommunication Universal Mobile Telecommunication SystemSystem

Telecommunications

MSc in Software Development


UMTS Requirements (Radio Access)UMTS Requirements (Radio Access)

• Maximum User Bit Rates– Rural Outdoor: 144kb/s (goal 384kb/s), up to 500km/h

– Suburban Outdoor: 384kb/s (goal 512kb/s), up to 120km/h

– Indoor/Urban Outdoor: 2Mb/s, max speed 10km/h

• Flexibility– Negotiation of bearer service attributes

– Parallel bearer services (service mix, multimedia)

– Circuit and packet switched bearers

– Scheduling of bearers

– Link adaptation (quality, traffic, load, radio conditions)

– Range of bit rates

– Variable bit rate real-time capabilities



• Handover– Seamless handover between cells of one operator

– Efficient handover between UMTS and 2nd generation

• Compatibility with fixed network services– ATM bearer services

– GSM services

– IP based services

– B/N-ISDN services

• Facilities for quality of service provision

• Private and residential operators

• High spectrum efficiency

• Asymmetric band usage



• Coverage/Capacity– provide variety of initial coverage/capacity configurations

– Flexible use of various cell types and relations between cells

– Ability to provide cost effective coverage in rural areas

• Viability of mobile terminals

• Reasonable network cost and complexity

• Variety of mobile terminal/station types

• Security

• Compatibility with IMT2000

• Coexistence with other systems


Technology AspectsTechnology Aspects

• Flexible radio interface based on wideband CDMA technology

• Data rates up to 2Mbps and beyond• Wide range of teleservices

– voice, voice related– video, videotelephony– multimedia– data, Internet– broadcast, paging

• Hierarchical Architecture– Satellite– Public outdoor (macro, micro cell)– Public indoor– Private indoor


UMTS Terrestrial Radio AccessUMTS Terrestrial Radio Access

• 3rd generation radio access system

– FDD mode (W-CDMA)

– TDD mode (TD-CDMA)

– Multicarrier mode (optional)

• Core network based on evolved GSM network


Channel bandwidth 5MHz (10Mhz, 20Mhz)

Chip rate 3.84Mchip/s

Frame length 10ms

Channelisation spreading variable spreading

Data modulation QPSK(downlink), BPSK (uplink)

Spreading modulation Balanced QPSK (downlink)

Dual-channel QPSK (uplink)

Coherent detection User dedicated time multiplexed pilot

Common pilot in downlink

Channel multiplexing in Control and pilot channel time multiplexed

uplink I and Q multiplexing for data and control

Multirate Variable spreading

UTRA WUTRA W--CDMA Radio InterfaceCDMA Radio Interface


UTRA WUTRA W--CDMA Radio InterfaceCDMA Radio Interface

Spreading factors 4 - 256

Power control Open and fast closed loop (1500Hz)

Spreading (downlink) Variable length orthogonal sequences for channel separation, Gold sequences for cell

and user separation

Spreading (uplink) Variable length orthogonal sequences for channel separation, Gold sequences 241 for

user separation (diff. Time shifts in I, Q,

cycle 216 10ms radio frames)

Handover Soft handover

Interfrequency handover


NodeB

NodeB

UTRA Network UTRA Network -- Interfaces and ProtocolsInterfaces and Protocols

UE

NodeB

RNC

3G SGSN GGSN

NodeB

NodeB

NodeB

RNC

HSS

Iur

Uu

Gs’

Gn

PSTN/ISDN

Internet

IuIub

UTRAN

3G MSC/

VLR

MAP


UTRA Network FunctionsUTRA Network Functions

• Overall system access control– System information broadcasting

• Radio channel ciphering– Radio channel ciphering

– Radio channel deciphering

• Handover– Radio environment survey

– Handover decision

– Macro-diversity control

– Handover control, execution, completion

– SRNS relocation

– Inter-system handover


UTRA Network FunctionsUTRA Network Functions

• Radio resource management and control

– Radio bearer connection setup and release

– Reservation and release of physical radio channels

– Allocation and de-allocation of physical radio channels

– Packet data transfer over radio

– RF power control and setting

– Radio channel coding and decoding

– Channel coding control

– Initial (random) access detection and handling


Radio Interface Protocol ArchitectureRadio Interface Protocol Architecture

RLCRLC

RRC

PHY

MAC

RLC RLC

TransportChannels

LogicalChannels

C-plane signalling U-plane information

L3

L2/RLC

L2/MAC

L1

PDCP BMC


Physical Layer Physical Layer -- FDD ModeFDD Mode

• Procedures

– Power control

– Cell search

– Random access

– Idle mode operation

• Optional features

– Adaptive antennas

– Multi-user detection

– Downlink transmit diversity

– Location function support


Physical Layer Physical Layer -- TDD ModeTDD Mode

• Procedures

– Synchronisation of TDD base stations

– Dynamic channel allocation

– Power control

– Cell search

– Random access

• Optional features

– Joint detection (MUD)

– Adaptive antennas

– Downlink transmit diversity

– Location function support


MAC LayerMAC Layer

• MAC services– Data transfer

– Re-allocation of radio resources and MAC parameters

– Reporting of measurements

– Allocation/deallocation of radio resource

• MAC logical channels– Control Channels (CCH)

• Synchronisation Control Channel (SCCH)

• Broadcast Control Channel (BCCH)

• Paging Control Channel (PCCH)

• Dedicated Control Channel (DCCH)

• Common Control Channel (CCCH)


MAC LayerMAC Layer

• MAC logical channels (cont.)– Traffic Channel (TCH)

• Dedicated Traffic Channel (DTCH)

• MAC functions– Selection of appropriate transport format

– Priority handling between data flows

– Priority handling between users

– Scheduling of broadcast, paging and notification messages

– Identification of MSs on common transport channels

– Multiplexing/demultiplexing of higher layer PDUs

– Routing of higher layer signalling (TDD mode)


MAC LayerMAC Layer

• MAC functions (cont.)

– Maintenance of MAC signalling connection (TDD mode)

– Dynamic transport channel type switching

– Traffic volume monitoring

– Monitoring link quality (TDD mode)

– Support of open loop power control


RLC LayerRLC Layer

• RLC services

– L2 connection establishment/release

– Transparent data transfer

– Unacknowledged data transfer

– Acknowledged data transfer

– QoS setting

• RLC functions

– Connection control

– Segmentation and reassembly

– Transfer of user data

– Error correction


RLC LayerRLC Layer

• RLC functions (cont.)

– In-sequence delivery of L2 SDUs to higher layers

– Duplicate detection

– Flow control

– Protocol error detection and recovery

– Suspend/resume function

– Quick repeat

– Keep alive

– Ciphering


Radio Resource ControlRadio Resource Control• RRC services

– General control– Notification– Dedicated control

• RRC functions– Broadcast information from core & radio access network– Establishment, maintenance, and release of RRC connections

between UE and UTRAN– Establishment, re-configuration, and release of radio access

bearers– Assignment, re-configuration, and release of radio resources

for RRC connection– RRC connection mobility functions– Arbitration of radio resource allocation between cells


Radio Resource ControlRadio Resource Control

• Control of requested QoS

• UE measurement reporting and control of reporting

• Outer loop power control

• Control of ciphering

• Initial cell selection and re-selection in idle mode

• paging/notification

• contention resolution and congestion control


FDD Mode Transport ChannelsFDD Mode Transport Channels

• Dedicated transport channel

– DCH - Dedicated Channel

• Common transport channel

– BCCH - Broadcast Control Channel

– FACH - Forward Access Channel

– PCH - Paging Channel

– RACH - Random Access Channel


FDD Mode Frame Structure FDD Mode Frame Structure -- UplinkUplink

Data, Ndata bits

Pilot, Npilot bits TPC, NTPC bits RI, NRI bits

DPDCH

DPCCH

Slot #1 Slot #2 Slot #i Slot #16

0.625ms, 10*2k bits (k=0…6)

Frame #1 Frame #2 Frame #i Frame #72

Tf = 10ms

Tsuper = 720ms

Variable spreading factor SF = 256/2k (k = 0…6)

1 Dedicated Physical Data/Control Channel



2 Physical Random Access Channel (PRACH)

Random access burst

Random access burst

Random access burst

Random access burst

Frame boundary

1.25ms

Offset of access slot #i

Access slot #1

Access slot #2

Access slot #i

Access slot #8



Random Access Burst Format

Preamble part Message part

1 ms 0.25 ms 10 ms

Random access burst

Data part

Pilot symbols

Rate Information

10 ms

Message part of random access burst

MS ID Req. Serv. CRCOptional user packet

Structure of Random Access burst data part

I

Q


FDD Mode Frame Structure FDD Mode Frame Structure -- DownlinkDownlink

Pilot TPC RI

DPDCHDPCCH

Slot #1 Slot #2 Slot #i Slot #16

0.625ms, 20*2k bits (k=0…6)

Frame #1 Frame #2 Frame #i Frame #72

Tf = 10ms

Tsuper = 720ms

Variable spreading factor SF = 256/2k (k = 0…6)

Data


Downlink Spreading and ModulationDownlink Spreading and Modulation

S →P

p(t)

p(t)

cch cscramb

cos(ωt)

sin(ωt)

DPDCH/DPCCH

I

Q

• cch Channelisation code (OVSF), separates connections

• cscramb Scrambling code (10ms), only one per cell

• p(t) pulse shaping filter


Uplink Spreading and ModulationUplink Spreading and Modulation

I

Q

IQ

mux

DPDCH

DPCCH

cd

cc

p(t)

p(t)

Re{..}

Im{..}

cos(ωt)

sin(ωt)

I+jQ

cscramb

• cc, cd Channelisation codes, separates data and control

• cscramb Scrambling code (10ms or 256 chips), separates MSs

• p(t) pulse shaping filter


Transport Channel Coding/MultiplexingTransport Channel Coding/Multiplexing

Channel

coding

Channel

coding

Rate-

matching

Inter-frame

interleaving

Rate-

matching

Inter-frame

interleaving

Rate-

matching

Intra-frame

interleaving

Multiplexing

TrCh 1

TrCh M

CC TrCh

Static rate matching Dynamic rate matching


FDD Mode FDD Mode -- Cell SearchCell Search

cp

csi,1

cp cp

csi,2 cs

i,16

One radio frame (10ms)

One slot (0.625ms)

ccpp:: primary synchronisation codeprimary synchronisation code

ccssi,ki,k:: secondary synchronisation codesecondary synchronisation code

Search PSC using

match filter

Decode SSC

sequence

Search all codes

in long-code

group

Slot timingSlot timing

acquiredacquired

Frame timing andFrame timing and

longlong--code groupcode group

acquiredacquired

LongLong--codecode

acquiredacquired


FDD Mode FDD Mode -- Slotted Mode OperationSlotted Mode Operation

Measurement period

10 ms

Synchronisation signal on different carrier

One frame 10ms One frame 10ms One frame 10ms


TDD Mode Frame StructureTDD Mode Frame Structure

TDD frame 10 msSpreading codes

Data Midamble Data

BS Tx part MS Tx part

Uplink/downlink

switch point

(variable)

downlink

UL/DL

uplink


Packet Data TransmissionPacket Data Transmission

Three options for packet data transmission– Short packets in RACH

Random access burst

including small packet

Random Access Channel (RACH)

Random access burst

including small packet

Arbitrary time



Random access

burst

Random access

burst

Packet Packet

Random Access Channel (RACH)

Dedicated Channel (DCH)

– Packet reservation based transmission on a dedicated channel



– Packet transmission on existing dedicated channel

Capacity

request

Unscheduled

packet

Scheduled

packet

Link maintenance (pilot and power control)

Dedicated Channel (DCH)


HandoverHandover

• UTRA Soft handover

– Soft handover between cells

– Softer handover between sectors of same cell

• UTRA to UTRA hard handover

– Inter-frequency handover

– FDD/TDD and TDD/FDD handover

• UTRA to GSM hard handover


InterInter--operability GSM/UTRAoperability GSM/UTRA

• Requirement for UTRA NodeBs to inform dual mode MS

of existing GSM frequencies in the area

• Inter-operation between UTRAN and GSM BSS to

maintain current service during inter-system

handover

• GSM network is required to indicate WCDMA

spreading codes for easy cell identification


UMTS Core NetworkUMTS Core Network

• Circuit-switched core network– consists of

– 3G MSC

– 3G Gateway MSC

– Media Gateway

• Packet-switched core network– consists of

– 3G SGSN

– 3G GGSN

– IP Multimedia Subsystem (IMS) (from Rel.5 onwards)


IP Multimedia SubsystemIP Multimedia Subsystem

P-CSCF

IM Subsystem

CSCF HSS

Cx

IP Multimedia Networks

Mn

Mb

Mg

Mm

Mb

Mr

Mb

Legacy mobile signalling Networks

Mw

Go

Mw

Gm

Mj Mi

Mk Mk

C, D, Gc, Gr

Mb

Mb

Mb

MRFC

Mp

PSTN

PSTN

UE

BGCF

MGCF IMS-MGW

BGCF CSCF

MRFP

PSTN


Call Session Control FunctionCall Session Control Function

• Call Session Control Function (CSCF) is SIP server providing control signalling functionality for multimedia services in IP networks

• Proxy-CSCF– first contact point of the UE with the IMS (always in network

where UE resides)– forwards SIP messages to S-CSF/I-CSCF

• Serving-CSCF– always assigned in the home network, acts as registrar making

information available through HSS– handles session states to support SIP services

• Interrogating-CSCF– main contact point in network for home or roaming subscriber in

that network– resolves SIP server addresses for current session


Other IMS Network ElementsOther IMS Network Elements

• Breakout Gateway Control Function (BGCF)– selects network for PSTN breakout– once network for breakout is chosen, selects MGCF for inter-working

with PSTN

• Multimedia Resource Function– divided into Media Resource Function Control (MRFC) – controls

media stream resources provided on the Mb interface– and Media Resource Function Processor (MRFP) provides resources for

media streams on the Mb interface

• Media Gateway (MGW)– terminates bearer channels from circuit-switched domain and media

packet streams from the packet-switched domain

• Media Gateway Control Function (MGCF)– controls MGW and translates signalling messages between different

signalling systems


UMTS Protocol ArchitectureUMTS Protocol Architecture

Transport Network Layer

Radio Network Layer

System Network Layer

CONTROL PLANE

CONTROL PLANE

CONTROL PLANE

USER PLANE

USER PLANE

USER PLANE

UE Node B RNC SGSN GGSN


Transport Network Layer ProtocolsTransport Network Layer Protocols

UE Node B

Uu Iub

WCDMA L1

WCDMA L1

Transport

FP

RLC

MAC

SRNC CN

Iu

RRC/ PDCP

RANAP/ Iu FP

RANAP/ Iu FP

RLC

MAC

FP

Transport

Transport Layers

Transport Layers

RRC/ PDCP

Layer 1

Layer 2

Terrestrial Interfaces Radio Interface


Transport Network Layer Protocols at Transport Network Layer Protocols at UuUu

• Medium Access Control (MAC) protocol– maps logical channels into appropriate transport channels

• Radio Link Control (RLC) protocol– provide segmentation/reassembly for Protocol Data Units

– provides error correction functions for both control and user data

• Transport Network Layer– used by RRC functions in the control plane as radio signalling

bearers

– used by service-specific protocol layers in the user plane such as the Packet Data Convergence Protocol


Transport Network Protocols over Terrestrial Transport Network Protocols over Terrestrial InterfacesInterfaces

• Use of ATM as Layer 2 protocol on UTRAN terrestrial interfaces

• Use of Ethernet as Layer 2 on some interfaces in the core network in particular IMS

• Layer 3 and 4 protocols are IP and TCP


Radio Network LayerRadio Network Layer

UE Node B DRNC SRNC CN

Uu Iub Iur Iu

RRC RRC NBAP NBAP RNSAP RNSAP RANAP RANAP


System Network LayerSystem Network Layer

UE RNC

Uu Iu

GPRS MM

SGSN

GPRS MM

SS SMS SM SS SMS SM Session

MM Context

Signalling Connection

• Lower layer protocol is responsible formobility management (here we refer to GPRS MM as the mobility management responsible for GPRS users)

• On top of GPRS MM run the communication service specific protocols, session management (SM), supplementary services (SS), and short message service (SMS)

• On top of the UMTS network layer operate the IP based transport and application layer protocols


UMTS Quality of Service ClassesUMTS Quality of Service Classes

250100Transfer delay max value (ms)

10-3, 10-4, 10-610-1, 10-2, 7*10-3, 10-3, 10-

4, 10-510-2, 7*10-3, 10-3, 10-4, 10-

5SDU error ratio

4*10-3, 10-5, 6*10-85*10-2, 10-2, 5*10-3, 10-3, 10-4, 10-6Residual BER

≤1 500 or 1 502Max. SDU size (octets)

< 2 048Guaranteed bit rate (kbps)

< 2 048 – overhead< 2 048Maximum bit rate (kbps)

BackgroundInteractiveStreamingConversationalTraffic class

• Main criteria for QoS is data transmission delay with other criteria including bit rate (bandwidth), nature of traffic (symm./asymm.), error rate, etc.

• Conversational and streaming class are for real-time traffic

• Interactive and background class are used by normal Internet type data traffic with interactive for WWW browsing and Telnet and background for e-mail and FTP access


ApplicationsApplications

• Conversational Class Applications– Circuit-switched voice service

• similar to GSM using the 24.008 protocol and AMR speech encoding

– Packet-switched voice service• uses SIP based session management and SDP based session description

as a Voice over IP service, AMR encoding used for speech encoding

• Streaming Class Applications– video and audio streaming using buffering mechanisms at the

receiver to compensate for delay variability in bearer service

• Interactive Class Applications– applications such as web browsing and remote login where the

overall level of service is characterised by the request-response delay

• Background Class Applications– Any non real-time application such as e-mail, ftp access, etc with

delay insensitivity but error free requirement


QoSQoSRequirementsRequirements

• Conversational/Real-Time Service requirements– ITU-T G.114 limits for voice service

• 0 – 150ms preferred range (<30ms unnoticeable)• 150 – 400ms acceptable range• >400ms unacceptable

– human ear intolerant to jitter but tolerant to some extend to error with a limit of ca. 3% Frame Erasure Rate

• Interactive Service requirement– Zero loss (error) requirement– Delay tolerance – 2 – 4 sec. for web browsing with 0.5 sec target– E-mail download from local service with similar delay requirement

to web browsing

• Background Service requirement– 30sec delivery delay for SMS


UMTS EndUMTS End--toto--End End QoSQoSArchitectureArchitecture

Netw ork Layers

Transport Layer

UE UTRAN SGSN GGSN IP Server

UMTS

A pplication Layer End-to-End Serv ice

UMTS Bearer Serv ice

UDP

IP IP

UDP

SIP SIP

IP

UDP

SIP

UE

External Bearer Serv ice

Radio A ccess Bearer CN Bearer

Backbone R adio Bearer

UTRA

F DD/TDD Phy s ic al

Iu Bearer Transport

Lay er

Sy s tem

Lay er

Radio

Lay er


RRC Connection Setup ProcedureRRC Connection Setup Procedure

R R C R R C

3 . R R C C o nnec t io n S e tup C o m p le te

R R C R R C

1 . R R C C o nnec t io n R eq u est

R R C R R C

2 . R R C C o nnect io n S e tu p

{C C C H (o n R A C H ): R R C C o nnec t io n R eq u est }

{ C C C H (o n F A C H ): R R C C o nnec t io n S e tu p }

{D C C H (o n D C H ): R R C C o nnect io n S etu p C o m p le te }

U E N o de B R N C

R N C N o d e B U E


PDP Context Activation ProcedurePDP Context Activation Procedure

R A B

R B

U E N o d e B R N C

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

R R C R R C 7 . R a d io B ea re r S e tup C o m p le te

R A N A P R A N A P

8 . R A B A ss ignm e nt R esp o nse

S G S N

R A N A P

R A N A P

N B A P N B A P

N B A P N B A P

R R C

R R C 6 . R ad io B ea re r S e tup

{D C C H : R ad io B ea re r S e tup }

2 . R A B A ss ignme nt R e q ues t

3 . R ad io L ink S e tup

4 . R e sp o nse

5 . A L C A P Iub D a ta T ra nsp o rt B ea re r S e tup

G G S N

G G S N

S M S M 1 . D irec t T ra n s fer : A c tiva te P D P C o n tex t R eq ues t

S M

G T P G T P

G T P G T P

S M

9 . C re a te P D P C o ntext R eq ue s t

1 0 . R e sp o nse

1 1 . D ire c t T ra n s f e r : A c tiva te P D P C o nte xt


Location ManagementLocation Management

• VLR divided into Location Areas

• Each LA is divided into Routing Areas, which are controlled by the SGSN for paging purposes during packet transfer

• An RA is divided into UTRAN Routing Areas (URA), which are tracked by the RNC

LA

RA

RA

URA

URA URA

URA

Cell

Cell

Cell Cell

Cell Cell Cell Cell

Cell

Cell Cell

Cell

Cell

Cell Cell

Cell Cell

Cell Cell

Cell

Cell Cell


UTRAN Mobility ManagementUTRAN Mobility Management

• UTRAN mobility management is triggered by the establishment of an RRC connection

• In CONNECTED mode the UE can have different states depending on connection type– Cell DCH: UE has allocated dedicated

resources, e.g. DPDCH and DPCCH– Cell FACH: no dedicated resources but

communication through RACH and FACH

– Cell PCH: UE known by SRNC, UE reached via PCH

– URA PCH: location known at URA level and UE is paged via BCH

URA PCH

Cell PCH Idle Mode

Connected Mode

Cell FACH

Cell DCH


Core Network Mobility ManagementCore Network Mobility Management

• PMM-DETACHED: UE not known to the network, attach required, SM is inactive

• PMM-IDLE: UE attached to GPR core network with UE having established MM contexts, no RRC connection established (UE know with RA accuracy)

• PMM-CONNECTED: RRC connection established, SGSN tracks UE at RA level with RNC tracking at cell level

PMM DETACHED

PS Attach

PS Signalling Connection Release

PS Signalling Connection Establish

PS Detach Detach, PS Attach Reject, RAU Reject

PS Detach

Serving RNC relocation

3G -SGSN MM States MS MM States

PMM-IDLE SM-ACT IVE or

INACT IVE

Detach, PS Attach Reject, RAU Reject PS Attach

PMM DETACHED

PM M-

SM-ACTIVE or INACTIVE

CONNECTED PS Signalling

Connection Release

PS Signalling Connection Establish

PMM-

SM-ACTIVE or INACTIVE

CONNECTED PM M-IDLE SM-ACTIVE or

INACT IVE


Attach ProcedureAttach Procedure

U E S G S N

S G S N U E H L R

H L R

P M M

P M M

3. Ide nt ity R eq uest

P M M

P M M

3. Identit y R esp o nse

P M M

P M M

5 . A u thenticat io n R equ est

P M M

P M M

M A P

M A P

8. U p d ate L o cat io n

M A P

M A P

9. Insert S ubscr ibe r D ata

M A P

M A P

9 . A ck

M A P

M A P

1 0 . U pd ate L o c atio n A ck

P M M

P M M

11 . A t tach A ccep t

P M M

P M M 1 2 . A ttach C o m plete

M A P

M A P

6. C heck IM E I

M A P M A P 6. A ck

5 . A u thenticat io n R esp o nse

M A P

M A P

M A P

M A P

4 . S end A uth In fo

4 . A ck

R A N A P

R R C

7 . S ec ur ity M o de C o m m and

7 . S ecur it y M o d e C o m plete

1 . P S A t tach R eq

2 . Init ia l U E M e ssag e

R N C

R N C

R A N A P

R A N A P

R R C /R A N AP

R A N A P

R R C

R R C /R A N A P

R R C R R C


IntraIntra--SGSN SRNC Relocation ProcedureSGSN SRNC Relocation Procedure

N ode B Source

N ode B T arget

RN C Source

RN C T arget

U E SG SN

N ode B Source

N ode B T arget

RN C Source

RN C Targ et

U E SG S N

RN SAP RNSAP

2. Up link S ign allin g T ran sfer Ind ication

RA NAP

NBAP

3. Relocation Required

RA NAP RANA P 4. Relocation Request

RANA P RANAP 9. Relocation Request Ack

RANAP 10. Relocation Com m an d

RNSAP RNSA P 11. Relocat ion C om m it

RANAP RAN AP 12. Relocation Detect

RRC RRC 14. RNT I Reallocation

RRC RRC 15. RNT I Reallocation C om plete

RAN AP RANA P 16. Relocation Com plete

RA NAP RANAP 17. Iu Release C om m and

RANAP

N BA P

NBAP NBAP

5. Radio L ink Setup Request

6. Radio L ink Setup Response

N BA P NBAP

7. ALC AP Iub D ata T ran sport Bearer Setup

8 . Downlin k and upl ink synch ron isation

RA NAP

1. Decision to in itia te SRN S relocation

NBAP N BAP 13. Radio L ink Failu re In d ication


InterInter--SGSN SRNC Relocation ProcedureSGSN SRNC Relocation Procedure UE

3. Forward Relocation Request

4. Relocation Request

2. Relocation Required

6. Relocation Command

5. Forward Relocation Rsp

4. Relocation Request Acknowledge

9. Relocation Detect

12. Relocation Complete

12. Forward Relocation Complete

10. RAN Mobility Information

10. Confirm

11. Update PDP Context Request

13. Iu Release Command

13. Complete

1. Decision to perform SRNS relocation

8. Relocation Commit

7. Forwarding of data

11. Response

12. Ack

GTP GTP

GTP GTP

Establishment of Radio Access Bearers

RANAP RANAP

RANAP RANAP

RANAP RANAP

RANAP RANAP

RANAP RANAP

RANAP RANAP

RANAP RANAP

RANAP RANAP

GTP GTP

GTP GTP

RNSAP RNSAP

RNSAP RNSAP

RRC RRC

RRC RRC

GTP

GTP GTP

GTP

GGSN New SGSN

Old SGSN

Target RNC

Source RNC

UE GGSN New SGSN

Old SGSN

Target RNC

Source RNC


Branch Addition ProcedureBranch Addition Procedure

D CH -FP D CH -FP 4. D ownlink Synchronisation

N B AP N B A P 1. Radio Link Setup Request

N B A P N B A P 2. R adio L ink Setup R esponse

D ecision to setup new R L

RR C RR C

7. A ctive Set U pdate Complete

RR C RR C

6. A ctive Set U pdate

{D CC H : A ctive Set U pdate}

3. A LC A P Iub B earer Setup

D CH -FP D C H -FP 5. U plink Synchronisation

{D CC H : A ctive Set U pdate Complete}

U E

N ode B R N C U E

Start T X

S tart R X

N ode B RN C


Routing Area Update ProcedureRouting Area Update Procedure

4: Routeing Area Update Request

5: Security Mode Command

6: Security Mode Command

7: Security Mode Complete

8: Sec Mode Compl

9: Routeing Area Update Accept

10: Routeing Area Update Complete

MS Node B RNC SGSN

MS Node B RNC SGSN

1-3: RRC Connection Establishment

11-12: RRC Connection Release

RRC

RRC

RRC

RRC

RANAP RANAP

RANAP RANAP

RRC/RANAP RRC RANAP

RANAP

RRC/RANAP RRC RANAP

RRC/RANAP RRC


Service Request ProcedureService Request Procedure SGSN UE

2. Service Request

3. Security Functions

RNC 1. RRC Connection Request

8. Uplink PDU

1. RRC Connection Setup

4. RAB Assignment Request

6. RAB Assignment Response

5. RB Setup

6. RB Setup Complete

HLR GGSN

7. SGSN-Initiated PDP Context Modification

4. Service Accept

SGSN UE RNC HLR GGSN


Paging ProcedurePaging Procedure

RANAP RANAP 1. Paging

RANAP RANAP

1. Paging

RANAP RANAP

1. Paging

A) UE is in IDLE mode

2. PCCH: Paging Type I

RNSAP RNSAP

B) UE is in URA connected mode or in Cell_PCH RRC state

2. Paging Request



C) UE is in cell connected mode with existing DCCH

2. DCCH: Paging Type 2

RRC

RRC

RRC

RRC

RRC

RRC

RRC

RRC

UE RNC MSC RNC NODE B

NODE B

UE RNC MSC RNC

Umts

Technology

radio channel coding

radio conditions

handling dirk pesch

radio rf power control

systems dirk pesch

umts terrestrial radio

control multiratevariable

evolved gsm network