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UMTSUniversal Mobile Telecommunication System

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OUTLINE

Definition

Evolution 2G

3G Specification UMTS Multiple Access Modulation

UMTS Architecture

RG DIVISI UMTS & CDMA 2012

Spreading &Scrambling

UMTS Handover Handover CDMA OVSF Tree` Bit Rate Power Control

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UMTS (Universal Mobile Telecommunication

System) is the third-generation(3G) successor to

the second-generation GSM-based technologies,including GPRS, and EDGE.

UMTS as first version of 3G based European (3GPP

takes official name 3GPP system Release 99

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DEFINITION

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EVOLUTION 2G 3G

GSM (2G) GPRS (2,5G) EDGE (2,75G) UMTS (3G)

Multiple

AccessTDMA/FDMA TDMA/FDMA TDMA/FDMA WCDMA

Modulation GMSK GMSK 8 PSK QPSK

Bitrate 9,6 Kbps 114 Kbps 384 Kbps 2Mbps

Feature Voice, SMSVoice, SMS, Data,

MMS

Voice, SMS,

Data, MMS

Voice, SMS,

Data, MMS,

Video Call, Video

Streaming

Switching Circuit Switch

Circuit

Switch/PacketSwitch

Circuit

Switch/PacketSwitch

Circuit

Switch/PacketSwitch

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Bit Rate Up To 2 MbpsDuplexing Method FDD / TDD

Operating BandFDD :

UPLINK 1920-1980 MHz

DOWNLINK 2110-2170 MHz

TDD :

1900 1920 MHz

2010 2025 MHz

Bandwidth 5 MHz

Multiple Access WCDMAModulation UPLINK : BPSK & DOWNLINK : QPSK

New Element UE, Node B, RNCChip Rate 3.84 Mcps

Spreading Code Variable: Uplink (4-256) & Downlink (4-512)

Scrambling Code Uplink : 224 & Downlink : 218-1

UMTS SPECIFICATION

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Multiple Access still same with IS-95

but UMTS using bigger chip rate

(i.e. 3.84 Mcps) than IS-95/CdmaOne

(i.e. 1.288 Mcps)

Thus it leads 5 MHz carrier bandwidthfor UMTS

RG DIVISI UMTS & CDMA 2012

3.84 Mcps

FREQUENCY

1.25 MHZ

1

2

3

4

Code

CDMA

MULTIPLE ACCESS

Bandwidth Carrier WCDMA

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Uplink

1 0

Constellation diagram for BPSK

Downlink

0111

10 00

Constellation diagram for QPSK

MODULATION

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UMTSARCHITECTURE

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3GPP Release 99

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3GPP Release 4

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11

UMTS System Architecture

USIM

ME

Node B

Node B

RNC

Node B

Node B

RNC

MSC/

VLRGMSC

SGSN GGSN

HLR

UTRAN CNUE

ExternalNetwor

ks

Cu

Uu Iu

IubIur

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Used as Tx and Rx

Channel Encoding

Modulation andDemodulation

Spreading and

Despreading

Mobility Management

Identity management

USER EQUIPMENT

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Performs the air interface

processing :

Modulation and

Demodulation Spreading and Despreading

Channel Coding

Synchronization

Power Control

RF Processing

MUX DEMUX

NODE B

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Responsible for RRM (Radio

Resource Management) and

control of the Node Bs.

Handover Control Power Control

Admission Control

Load Control

Packet Scheduling

Code Management

RNC

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SPREADING

&SCRAMBLING

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Channelization Code (OVSF)

UL

Distinguish physical data and

control data from same

terminal

DL

Distinguish connection to

different terminals in a same

cell

ScramblingCode

ULDistinguish transmissions from

different users

DL Distinguish cells

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Orthogonal Variable Spreading Factor codes (OVSF)

OVSF code generation

(1)

(1,1)

(1,-1)

(1,1,1,1)

(1,1,1,1,1,1,1,1)

(1,1,-1,-1)

(1,1,1,1,-1,-1,-1,-1)

(1,1,-1,-1,1,1,-1-,1)

(1,1,-1,-1,-1,-1,1,1)

(1,-1,1,-1,1,-1,1,-1)

(1,-1,1,-1,-1,1,-1,1)

(1,-1,-1,1,1,-1,-1,1)

(1,-1,-1,1,-1,1,1,-1)

(1,-1,1,-1)

(1,-1,-1,1)

C1,0

C2,0

C2,1

C4,0

C4,1

C4,2

C4,3

C8,0

C8,1

C8,2

C8,3

C8,4

C8,5

C8,6

C8,7

SF = 1 SF = 2 SF = 4 SF = 8

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RG DIVISI UMTS & CDMA 2012

; Chip Rate UMTS = 3.84 Mcps

UPLINK DOWNLINK

Spreading

Factor Value

Symbol Rate

(Ksps)

Channel bit

Rate (Kbps)

256

128

6432

16

8

4

15

30

60120

240

480

960

15

30

60120

240

480

960

Spreading

Factor Value

Symbol Rate

(Ksps)

Channel bit

Rate (Kbps)

512

256

12864

32

16

8

4

7.5

15

3060

120

240

480

960

15

30

60120

240

480

960

1920

=

UMTS BIT RATE

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Basic Process of Handover

MEASUREMENT

EXECUTION

DECISION

UMTS HANDOVER

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Pilot Set

Active Set

Candidate Set

Neighbor Set

Remaining Set

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Type () of Handover Hard Handover

Soft Handover

Softer Handover

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Soft Handover

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Softer Handover

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UMTS POWER CONTROL

PtPt

Pr1 Pr2

user 1user 2

user 3 user M

Pr3 PrM

User 2

User 1

frekuensi

power

frekuensi

power

User 1,

User 2,

User 4,

User 3,

User 5,

User 6,

User 8,

User 7,

User 9,

User 10,

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