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UMTS based on WCDMA

Jan 13, 2016

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UMTS based on WCDMA. INTRODUCTION. Analogue mobile systems are commonly referred to as “First Generation” (e.g. AMPS) . Digital systems currently in use, such as GSM, CDMA one IS-95 are second generation or 2G Systems - PowerPoint PPT Presentation
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Page 1: UMTS based on WCDMA
Page 2: UMTS based on WCDMA

INTRODUCTION Analogue mobile systems are commonly referred to as “First

Generation” (e.g. AMPS).

Digital systems currently in use, such as GSM, CDMA one IS-95 are second generation or 2G Systems

Third generation (3G) mobile systems are designed for multimedia

communication, enhanced high quality image video and access

to information services

Multimedia communications require higher bandwidth than what 2G can offer.

Page 3: UMTS based on WCDMA

1G Analogue or Amps Frequency modulation For voice transmission

2G CDMA IS-95, GSM FDMA, TDMA, CDMA Voice plus Data services

Cellular Generations

3G WCDMA, CDMA2000 High service flexibility compatibility QOS

1980 1990 2000

Page 4: UMTS based on WCDMA

Multiple Access Methods

User 1

User 2

User 3

Guard Band

Guard Band

time

FDMA

User2

User1

User3

User3

User3

User1

User1

User2

User2

time

CDMA (FH)

Use

r 1

Use

r 2

Use

r 3

Gua

rd B

and

Gua

rd B

and

time

freq

uenc

y

TDMA

Page 5: UMTS based on WCDMA

CDMA

CDMA

Pure CDMA Hybrid CDMA

THDS FH

Slow FH Fast FH

NarrowbandWideband

TDMA/CDMA

DS/FH/TH MC/MT-CDMA

Page 6: UMTS based on WCDMA

The 3G Choice is CDMA

Since 3G CDMA efficiently provides high quality voice services and high-speed packet data access, it is the preferred technology for 3G.

The 3G operating modes, WCDMA and CDMA2000 are all by far the most dominant in terms of current commercial services, operator deployment plans and vendor support.

Page 7: UMTS based on WCDMA

Conceptual Network Model

User Equipment (UE)Mobile Equipment (ME)UMTS Service Identity Module (USIM)

Radio Access Network (RAN)UTRANGERAN

Core Network (CN)Circuit Switched (CS)Packet Switched (PS)

Page 8: UMTS based on WCDMA

UMTS High-Level System Architecture

UE UTRAN CN

Uu Iu

UE: User EquipmentCN: Core NetworkUTRAN: UMTS Terrestrial Radio Access Network

Page 9: UMTS based on WCDMA

PLMN Elements

USIM: UMTS Subscriber Identity ModuleME: Mobile EquipmentRNE: Radio Network ControllerCu, Uu, Iub, Iur, Iu are interface specifications

USIM

ME

Node B

Node B

Node B

Node B

RNC

RNC

MSC/ VLR GMSC

SGSN GGSN

HLR

PLMN, PSTN,

ISDN, etc.

Internet

Uu Iu

UE UTRAN CN External Networks

Cu IurIub

Page 10: UMTS based on WCDMA

What is WCDMAWCDMA is a Wideband Direct-Sequence Code Division Multiple Access (DS-CDMA) system.

Information bits are spread over a wide bandwidth by multiplying the it with pseudo-random bits called chips derived from CDMA spreading codes.

The chip rate of 3.84 Mcps used in WCDMA leads to a carrier bandwidth of approximately 5 MHz.

Narrowband CDMA (IS-95) occupies a bandwidth of 1.25 MHz.

Page 11: UMTS based on WCDMA

Signal Spreading

1

-1

1

-1

Data

PN

1

-1

SpreadData

Page 12: UMTS based on WCDMA

Signal Spreading/Despreading

ChannelData Rb(bits/s)

PN SequenceSpreading codeRc(chips/s)

PN SequenceSpreading codeRc(chips/s)

Data Rb(bits/s)

PN: Pseudorandom Noise

Tx Rx

Pow

er

Frequency

Pow

er

Frequency

Pow

er

Frequency

Page 13: UMTS based on WCDMA

Pseudorandom Codes

The ideal spreading code would be an infinite sequence of equally likely random binary digits.In practice, periodic pseudorandom codes are used instead (PN codes).Specific PN codes include:

maximal-length codeGold codes

Page 14: UMTS based on WCDMA

Multipath Delay Profile

Page 15: UMTS based on WCDMA

MS Transmit Power Control

One of the most important aspects of CDMA is a tight and fast power control, in particular uplink.

Without power control,a single over powered mobile could lock the entire cell.

Fast closed-loop power control algorithm is used in WCDMA.

Page 16: UMTS based on WCDMA

Closed-Loop Power Control

MS2

MS1

power controlcommands to the mobiles

P1

P2

near

far

Page 17: UMTS based on WCDMA

Cell HandoverCell Handover

f2

f1

Traditional ‘Hard’ handover in GSM

BSC

Page 18: UMTS based on WCDMA

Cell HandoverCell Handover

f1

f1

‘Soft’ handover in UMTS

RNC

Page 19: UMTS based on WCDMA

FUTURE SERVICES

Page 20: UMTS based on WCDMA

Mobile Broadband WCDMAMobile Broadband WCDMA

WCDMA for Mobile Broadband services WCDMA for Mobile Broadband services provides key benefits like user provides key benefits like user convenience with its "everywhere convenience with its "everywhere coverage" and ADSL-like data speeds. coverage" and ADSL-like data speeds.

It also offers time to market and cost It also offers time to market and cost advantages for WCDMA operators that advantages for WCDMA operators that can build on their infrastructure assets. can build on their infrastructure assets.

Page 21: UMTS based on WCDMA

Mobile Broadband WCDMAMobile Broadband WCDMA

WCDMAWCDMA WCDMA technology gives you a WCDMA technology gives you a faster data connection in mobile networks: faster data connection in mobile networks: currently up to 384 kbps.. In future currently up to 384 kbps.. In future generations of WCDMA technology, this generations of WCDMA technology, this may increase up to even 10 Mbps. may increase up to even 10 Mbps.

You can do all of the usual activities: send You can do all of the usual activities: send SMS or MMS messages, download games SMS or MMS messages, download games and ringing tones, synchronize your phone and ringing tones, synchronize your phone with your PC calendar or corporate with your PC calendar or corporate intranet, and browse the Internet. intranet, and browse the Internet.

Page 22: UMTS based on WCDMA

Mobile Broadband WCDMAMobile Broadband WCDMA

WCDMA is also fast enough for video WCDMA is also fast enough for video streaming. With GPRS or EDGE phones, you streaming. With GPRS or EDGE phones, you can't do these things while talking. WCDMA can't do these things while talking. WCDMA is based on a different technology that lets is based on a different technology that lets you hold simultaneous voice and data you hold simultaneous voice and data connections, so you can send images and connections, so you can send images and check your email while you're on the phone. check your email while you're on the phone.

Like GPRS and EDGE, you're billed for data Like GPRS and EDGE, you're billed for data transferred, not for time connected, so you transferred, not for time connected, so you can be connected just about all the time. can be connected just about all the time.

Page 23: UMTS based on WCDMA

WCDMA

Information – DataAudio / Video on DemandInfotainment / EducationTV & Radio distribution

TelecommunicationPerson-to-Person Audio/Video, Fax (ISDN)Mobility-RoamingMailbox/Call Centre Services (SMS, Voice)Intelligent Network (IN)

Internet / IntranetE-MailWWWVoIPE-Commerce

UMTS Services

UMTS Based on WCDMA springs from convergence between the “World of Communication”

and “Information Technology”

Page 24: UMTS based on WCDMA

Rich mobile services drive demand Rich mobile services drive demand for bandwidthfor bandwidth

Page 25: UMTS based on WCDMA

Application sectors Application sectors considered in the considered in the

CalculationsCalculations The UMTS comprises a wide area of The UMTS comprises a wide area of applications, which are converted into six applications, which are converted into six main service classes for this analysis. These main service classes for this analysis. These are as follows:are as follows:

Speech Speech (S)(S) Simple Messaging Simple Messaging (SM)(SM) Switched Data Switched Data (SD)(SD) Medium Multimedia (Medium Multimedia (MMMMMM)) High Multimedia High Multimedia (HMM) (HMM) High Interactive MultimediaHigh Interactive Multimedia (HIMM): (HIMM):

Page 26: UMTS based on WCDMA

Application sectors Service Application sectors Service Classes.Classes. (Cont’d)(Cont’d)

Speech (S)Speech (S)-Simple one to one or one to many voice -Simple one to one or one to many voice -Teleconferencing services -Teleconferencing services -Voicemail-Voicemail

Simple MessagingSimple Messaging (SM)(SM)--SMS and pagingSMS and paging-E-mail delivery-E-mail delivery-Broadcast and public information-Broadcast and public information

Switched Data (SD)Switched Data (SD)

-Low speed dial-up LAN access-Low speed dial-up LAN access-Low speed Internet/Intranet Access-Low speed Internet/Intranet Access-Fax-Fax

Page 27: UMTS based on WCDMA

Application sectors Service Application sectors Service Classes. Classes. (Cont’d)(Cont’d)

Medium MultimediaMedium Multimedia (MMM)(MMM) -packet switched services which is require ‘busty’ -packet switched services which is require ‘busty’ in nature, data rates 0.5 Mbytes.in nature, data rates 0.5 Mbytes.

-Medium LAN and Internet/Intranet Access.-Medium LAN and Internet/Intranet Access.-Banking services-Banking services

High MultimediaHigh Multimedia (HMM)(HMM)-Packet switched services which is require ‘busty’ in -Packet switched services which is require ‘busty’ in nature, high bit rates of 10 Mbytes.nature, high bit rates of 10 Mbytes.-Fast LAN and Internet/Intranet Access-Fast LAN and Internet/Intranet Access-Video clips on demand-Video clips on demand-Audio clips on demand-Audio clips on demand-Online shopping-Online shopping

Page 28: UMTS based on WCDMA

Application sectors Service Application sectors Service Classes. Classes. (Cont’d)(Cont’d)

High Interactive Multimedia (HIMM):High Interactive Multimedia (HIMM): -high-speed data rates with a minimum delay-high-speed data rates with a minimum delay

-Video telephony and video conferencing -Video telephony and video conferencing

-Collaborative working and telepresence-Collaborative working and telepresence

-Lottery and betting services-Lottery and betting services

Note:Note:

The first three services are the logical extensions of The first three services are the logical extensions of second generation mobile market and the last three second generation mobile market and the last three are addressing are addressing

the new mobile multimedia market.the new mobile multimedia market.

Page 29: UMTS based on WCDMA

UMTS Spectrum Calculation UMTS Spectrum Calculation RESULTS RESULTS

ServicesServicesYear - 2006Year - 2006 Year - 2011Year - 2011

UplinkUplink DownlinDownlinkk

TotalTotal UplinkUplink DownlinDownlinkk

TotalTotal

High Interactive MMHigh Interactive MM 17.317.3 17.317.3 3535 42.342.3 42.342.3 8585

High MMHigh MM 0.470.47 93.393.3 9494 1.071.07 214.8214.8 216216

Medium MMMedium MM 0.30.3 7.67.6 88 0.280.28 10.710.7 1111

Switched DataSwitched Data 7.17.1 7.17.1 1414 5.15.1 5.15.1 1010

Simple MessagingSimple Messaging 0.980.98 0.980.98 22 0.950.95 0.950.95 22

SpeechSpeech 106.8106.8 106.8106.8 214214 114.7114.7 114.7114.7 230230

Sum Sum (MHz)(MHz) 132.8132.8 233.1233.1 366366 164.4164.4 389389 554554

TOTALTOTAL = 366 MHz x 1.10 == 366 MHz x 1.10 =403 403 MHzMHz

= 554 MHz x 1.05 == 554 MHz x 1.05 = 582 582 MHzMHz