2) network architecture

8/10/2019 2) Network Architecture

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•MobileComm Professionals, Inc.

UMTS Architecture

Correlation

Functionalities

Interfaces

Agenda



UMTS Architecture




UMTS Terrestrial Radio Access Network (UTRAN)

ATMBackbone

UuRNC

Iu(CS & PS)

Iur

Packet Domain

Circuit Domain

UE

ATMBackbone

Iub (ATM)

Iu CS

Iu PS

CoreNetwork

Node B(BTS)

RNC

Iur

Iu(CS & PS)

Uu

UE

Iub (ATM)

Node B(BTS)

UTRAN Rel 99 Architecture



•MobileComm Professionals, Inc.UMTS R4 Network Architecture

Circuit Switched

Core Network

GGSN

3G

SGSN

GPRS

USIMcard

WCDMA

mobile

GSM/WCDMA

mobile

RAN

WCDMA

BTS

WCDMA

BTS

RNC

RNC

MSC

HLR

MGW

IN SCP

SRR

PS Core Network

(PSTN/ISDN)

Internet

TCP/IP)

GSM/WCDMA

mobile

CBC



Functionality



•MobileComm Professionals, Inc.NodeB

Node B or BTS (Base Transceiver Station)

Node B functions:Call Processing

Radio accessPerformance MonitoringNetwork InterfaceRandom Access detection

RNCUE

Uu

Iub(ATM)




RNC (Radio Network Controller)

ATMBackbone

Node B(BTS)

RNC

Iu

Iur

ATMBackbone

Iub (ATM)

Core Network

RNC functions:Radio ResourceManagementUser Mobility HandlingRNS SupervisionInterfaces

RNC

Iur

RNC



•MobileComm Professionals, Inc.MSS & MGW

MSS functions:

Switching Call Setup Call Ticketing Interfaces

MGW functions: Adapt signaling Connect the user data. Provide tones and

announcements to end users. Perform the transcoding and

signal processing for the userplane when needed




RNS

RNC

RNS

RNC

Core Network (CN)

Node B Node B Node B Node B

Iu Iu

Iur

Iub IubIub Iub

Uu

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UE

RNS: Radio Network Subsystem

RNC: Radio Network Controller

Node B: Radio Base Station

UE: User Equipment

UTRAN

UMTS Traffic Interfaces



•MobileComm Professionals, Inc.Major Interfaces in UMTS

There are four major new interfaces

defined in UMTS Iu

• The interface between

UTRAN and the CN

Iur• The Interface between

different RNCs

Iub

•

The interface between theNode B and the RNC

Uu

• The air interface

RNC

Node-B

RNC

UE

CN

Uu

Iu

Iub

Iur



•MobileComm Professionals, Inc.Iu

• There are two parts to the Iu

interface – Iu-ps connecting UTRAN to

the PS Domain of the CN

– Iu-cs connecting UTRAN to

the CS Domain of the CN

• No radio resource signalling,

travels over this interface

– The Iu interface divides theUMTS network into the radio

specific UTRAN and the CN.

•RNC

Node-B

•RNC

UE

CN

Uu

Iu

Iub

Iur



•MobileComm Professionals, Inc.Iur

• The Iur interface allows soft

handovers between Node-Bs

attached to different RNCs

• It is an open interface to allow

the use of RNCs from different

manufacturers

• Its functions may be summarized:

– Support of basic inter-RNC

mobility

– Support of Dedicated and

Common Channel Traffic

RNC

Node-B

RNC

UE

CN

Uu

Iu

Iub

Iur



•MobileComm Professionals, Inc.Iub

• The Iub is an open interface to

allow the support of different

manufacturers supplying RNCs

and Node-Bs

• Its major functions are:

– Carries dedicated and

common channel traffic

between the RNC and the

Node-B

– Supports the control of the

Node-B by the RNC

RNC

Node-B

RNC

UE

CN

Uu

Iu

Iub

Iur



•MobileComm Professionals, Inc.Uu

• Clearly the Uu must be

standardised to allow multiple

UE vendors to be supported by a

network

• The major functions of the Uu

are to:

– Carry dedicated and common

channel traffic across the air

interface

– Provide signaling and controltraffic to the mobile from the

RNC and the Node-B

RNC

Node-B

RNC

UE

CN

Uu

Iu

Iub

Iur



•MobileComm Professionals, Inc.Summary

UMTS Architecture

Correlation

Functionalities

Interfaces




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2) network architecture

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