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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
RG DIVISI UMTS & CDMA 2012
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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