02 - UMTS Architecture

8/11/2019 02 - UMTS Architecture

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UMTS Network

Architecture


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UMTS ArchitectureSection Objectives

Upon completion of this section, the participant

should be able to:

List and Identify UMTS Elements in a PLMN including

UTRAN and Core Network.

Explain Briefly UMTS Standard Interface


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UMTS ArchitectureGSM Architecture

D

C

BTS

BSCA bis

TCUA ter

MSC

VLR

HLR/AuC

BSSNSS PSTN

MS


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UMTS ArchitectureFrom GSM to GSM/GPRS Architecture

D

C

BTS

BSCA bis

TCUA ter

MSC

VLR

HLR/AuC

PSTN

PCUGrFrame

RelayBackbone

SGSN GGSN

A

Gb

GbGn Gn

IPBackbone

MS


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Access Network Core Network

PrivateIP

Backbone

UMTS ArchitectureUMTS Elements in a PLMN

Node B(BTS)

Uu

Iub (ATM)

RNC

Iu(CS & PS)

RNC

Iur

Iur

Iu(CS & PS)

Node B(BTS)

Uu

TRAUMSC

VLR

SGSN

GGSN

Gn Gn

Gi

Iu CS

Iu PS

HLR/AuC

D

C

Gr

UE

UE

PSTN

ExternalPacket

Networks

ATMBackbone ATMBackbone

Iub (ATM)


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UMTS ArchitectureUTRAN Elements: Node B

Node B Logical node responsible

for radiotransmission/receptionin one or more cellsto/from the UE

Performs and reportsradio measurements tothe RNC

ATM Termination (Iub) Inner Loop Power

Control


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UMTS ArchitectureUTRAN Elements: RNC

RNC Responsible for the use and

integrity of the radio resources

within the RNS Responsible for the handover

decisions that require signalingto the UE

Provides a combining/splittingfunction to support macrodiversity between differentNode Bs

ATM Switching andMultiplexing


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UMTS ArchitectureCN Elements: GSM CN Elements (1)

HLR (Home Location Register) Stores the master copy of the users

service profile . Stores the UE location .

MSC/VLR (Mobile SwitchingCenter/Visitor Location Register)

Performs all necessary functions inorder to handle the circuit switchedservices to and from the mobilestations

Is expected to be identical inhardware to the latest generation

GSM MSCs, although with adifferent software version

GMSC (Gateway MSC) The point where UMTS PLMN is

connected to external CS networks.


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UMTS ArchitectureCN Elements: GSM CN Elements (2)

SGSN (Serving GPRS Support Node) Used for PS ( Packet Switched ) services. Performs additionally the role of the VLR :

Subscription Information The IMSI One or more temporary identities Zero or more PDP addresses

Location Information Depending on the operating mode of the MS, the cell or the routing

area where the MS is registered The VLR number of the associated VLR (if the Gs interface is

implemented) The GGSN address of each GGSN for which an active PDP context

exists

GGSN (Gateway GPRS Support Node)

Gateway to external packet networks


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UMTS ArchitectureOverall functions

Overall Functions of UTRAN

Provision of Radio Coverage

System Access Control

Security and Privacy

Handover

Radio ResourceManagement and Control

Overall Functions of CN

Switching

Mobility Management

Service Provision

Transmission of User Traffic

Between UTRAN(s) and/orFixed Network

Operations, Administrationand Maintenance


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UMTS ArchitectureUE Elements

UE RNCRNC CN

Node B provides :o Means of communication between UE and the networko Physical channels for synchronization, cell reselectiono Measurement information to the RNC

RNC is responsible for :o RRC (Radio Resource Control)o Handover (CS) & Cell Selection (PS)o Ciphering/ De-Ciphering

CN is responsible for :o Mobility Management (Location Registration, Authentication, Attach/Detach)o Session Managemento Bearer Negotiation/Service Request


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UMTS ArchitectureProtocols used over the Iub Interface

RNCRNC

IubNBAP

ALCAP

Iub FP

SAAL - UNI

AAL5

ATM

SAAL - UNI

AAL5

ATM

Data stream

AAL2

ATM

Control Plane User Plane

TransportNetworkControl

Plane

The Node B Application Protocol (NBAP)provides the following functions :

Cell Configuration ManagementSystem Information ManagementResource Event ManagementCommon Transport Channel ManagementRadio Link ManagementMeasurements on Common ResourcesMeasurements on Dedicated Resources

Physical layer

Note : ALCAP is not used by Nortel


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UMTS ArchitectureProtocols used over the Iur Interface

RNCRNC

IurRNSAP

ALCAP

Iur FPSCCP

SAAL - NNI

AAL5

ATM

SAAL - NNI

AAL5

ATM

Data stream

AAL2

ATM



Plane

The Radio Networks SubsystemApplication Protocol (RNSAP) providesthe following functions :

Radio Link ManagementMeasurement reporting functionTransfer of UL and DL functionsPower ControlLoad ManagementPaging functionsrelocation functions

Physical layer

RNCRNC

MTP3-B MTP3-B

Note : ALCAP is not used by Nortel


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UMTS ArchitectureProtocols used over the Iu CS Interface

Iu CSRANAP

ALCAP

Iu CS FPSCCP

SAAL - NNI

AAL5

ATM

SAAL - NNI

AAL5

ATM

Data stream

AAL2

ATM



Plane

The Radio Access NetworkApplication Protocol (RANAP) providesthe following functions :

Relocation functionsOverall RAB ManagementTransport of Non Access Stratum messagesPaging functionsSecurity functions

CN information broadcastOverload control over Iu Interface

Physical layer

RNCRNC

MTP3-B MTP3-B

WirelessGateway

TRAU


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UMTS ArchitectureProtocols used over the Iu PS Interface

Iu PSRANAP Iu PS FP

SCCP

SAAL - NNI

AAL5

ATM



Plane

The Radio Access NetworkApplication Protocol (RANAP) providesthe following functions :

Relocation functionsOverall RAB ManagementTransport of Non Access Stratum messagesPaging functionsSecurity functions

CN information broadcastOverload control over Iu Interface

Physical layer

RNCRNC

MTP3-B

WirelessGateway

GTP-U

SAAL - NNI

AAL5

ATM

UDP

SGSN

02 - UMTS Architecture

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