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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
Control Plane User Plane
TransportNetworkControl
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
Control Plane User Plane
TransportNetworkControl
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
Control Plane User Plane
TransportNetworkControl
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
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