Module 2 - Basic UMTS Architecture
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Transcript of Module 2 - Basic UMTS Architecture
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Module 2 - Basic UMTS Architecture
Training Slides
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Module Objectives
Describe UMTS architecture Describe UMTS equipment Describe UMTS interfaces
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General Principles of UMTS
The GSM operators offered an evolutionary way of upgrading their networks, including dual mode operation with GSM.
Greenfield operators should also be offered competitive solutions.
GPRS is seen as a stepping stone towards UMTS packet services.
Roaming and handover has to be supported between UMTS and GSM.
UMTS Network Management evolving from vendor current solutions for GSM Network Management.
Existing specifications (&software) to be used as much as possible, e.g. MAP signaling, existing supplementary services, etc.
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UMTS Architecture
ATMBackbone
Node B(BTS)
UuRNC
Iu (CS & PS)
RNC
Iur
Iur
Iu (CS & PS)
Node B(BTS)
Uu
Packet Domain
Circuit DomainUE
UE
ATMBackbone
Iub (ATM)
Iub (ATM)
Iu CS
Iu PS
Core Network
UMTS Terrestrial Radio Access Network (UTRAN)
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UMTS architecture New WCDMA air-interface => new Radio Access Network
(UTRAN = UMTS Terrestrial Radio Access Network) co-existing with GSM BSS
UTRAN consists of Base Stations and Radio Network Controllers (RNC)
New functionality needed to manage the radio resources New interface introduced between RNCs, Iur ATM is used - in UTRAN - between UTRAN and core network (IP over ATM) - however, base stations can be connected over existing
transmission lines Core network elements evolving from GSM Subscriber management based on SIM concept familiar from
GSM Security based on GSM security principles and mechanisms
and enhanced further
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Node B or BTS
Node B(BTS)
Uu Iub (ATM)
UE RNC
Main Node B functions: Call Processing Radio access Performance Monitoring Network interface Random Access detection
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Radio Network Controller
ATMBackbone
Node B(BTS)
RNCIu
ATMBackbone Core Network
Iub (ATM)
Iur
Main RNC functions: Radio Resource Management User Mobility Handling RNS Supervision Interfaces
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UMTS Core NetworkCore Network
3G MSC
PSTN
3G-SGSN
3G-GGSN
Gn
Internet
Iu CS
Iu PS
HLR/AuC
IPBackbone
ATMBackbone
Packet Domain
64 K TDM
Circuit Domain
Intranet
VLR
TRAU
Gr
C
D
B
RadioAccessNetwork
Gn
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TRAU TRAU (Transcoder and Rate Adaptation Unit)
3G MSC64 kb/sRNC AMR
Iu CSOver ATM
Iu CSOver PCM Links
12.2 kbit/s (GSM EFR)10.2 kbit/s7.95 kbit/s
7.40 kbit/s (IS-641)6.70 kbit/s (PDC EFR)
5.90 kbit/s5.15 kbit/s4.75 kbit/s
64 kbit/s
Main TRAU function: to change the speech coding Scheme
AMR ISDN VocoderAMR AMR
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3G MSC
3G MSC
Main MSC functions: Switching Call Setup Call Ticketing Interfaces
TRAU
AccessNetwork
HLR VLR
PSTN
BC
Iu CS
D
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HLR & AuC
Main HLR functions: Handling of permanent
subscriber data Handling of temporary
subscriber data Dialogue with AuC database
3G MSC
HLR/AuC
VLR
Gr
Main AuC functions: Storage of secret subscriber
keys and security algorithms Generation of security
information
3GSGSN
C
D
Gc
3GGGSN
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VLR
3G MSC
VLR
HLR
B
D
Main VLR functions: Storing all subscriber information
required for call handling and other purposes for mobile subscribers within its area
C
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3G SGSN
3G-SGSN
HLR/AuC
3G-GGSN
Gr
Gn
Iu PSRNC
Main SGSN functions: Packet Mobility Management Session Management Passing user traffic between
RNC and 3G-GGSN
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3G GGSN
3G-GGSN
3G-SGSN
Internet
Intranets
Gn
Gi
HLR/AuC
Gc
Main GGSN functions: Accounting Tunneling towards SGSN Tunneling towards external networks
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UMTS NetworkCore Network
ATMBackbone
UTRAN
Node B(BTS)
Uu
Iub (ATM)
RNCIu
(CS & PS)
RNC
Iur
Iur
Iu (CS & PS)
Node B(BTS)
Uu
ATMBackbone
Iub (ATM)
3G MSC
TRAUIu CS
PSTN
Circuit Domain
HLR/AuC
VLR
3GSGSN
PacketBackbone
Packet Domain
Iu PS
B C
D
3GGGSN
Gr
Internet
Intranets
UE
UE
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Module Review
UMTS Terrestrial Radio Access Network (UTRAN)
New network element names: Node B, RNC
UMTS Core Networks elements: 3GMSC, 3GSGSN, 3GGGSN, VLR, HLR, AuC, TRAU
Interfaces: ATM (lub), lu, lur
Module 2 - Basic UMTS ArchitectureModule ObjectivesGeneral Principles of UMTSUMTS ArchitectureUMTS architectureNode B or BTSRadio Network ControllerUMTS Core NetworkTRAU3G MSCHLR & AuCVLR3G SGSN3G GGSNUMTS NetworkModule Review