21 final 3g copy

8/7/2019 21 Final 3G copy

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Overview of 3G



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3G

• Higher bandwidth enables a range of new applications!!

• For the consumer – Video streaming, TV broadcast

– Video calls, video clips – news, music, sports – Enhanced gaming, chat, location services…

• For business – High speed teleworking / VPN access

– Sales force automation – Video conferencing – Real-time financial information



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3G Standards

• 3G Standard is created by ITU-T and is called asIMT-2000.

• The aim of IMT-2000 is to harmonize worldwide 3Gsystems to provide Global Roaming.



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IS-95 IS-136 & PDCGSM-

EDGE

GPRS

HSCSDIS-95B

Cdma2000-1xRTT

Cdma2000-1xEV,DV,DO

Cdma2000-3xRTT

W-CDMA

EDGE

TD-SCDMA

2G

3G

2.5G

3GPP3GPP2

Upgrade paths for 2G Technologies



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Improved performance, decreasing cost of delivery

Typical

average bitrates(peak rateshigher)

WEB browsing

Corporate data access

Streaming audio/video

Voice & SMSPresence/location

xHTML browsingApplication downloadingE-mail

MMS picture / video

Multitasking

3G-specific services takeadvantage of higher bandwidth

and/or real-time QoS

3G-specific services takeadvantage of higher bandwidth

and/or real-time QoS

A number of mobileservices are bearer

independent in nature

A number of mobileservices are bearer

independent in nature

HSDPA1-10Mbps

WCDMA2

Mbps

EGPRS473kbps

GPRS171kbps

GSM9.6

kbps

Push-to-talk

Broadbandin wide area

Video sharingVideo telephonyReal-time IPmultimedia and gamesMulticasting

Services roadmap

CDMA

2000-

EVDO

CDMA

2000-

EVDV

CDMA

20001x



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GSM evolution to 3G

GSM9.6kbps (onetimeslot)GSM DataAlso called CSD

GSM

General Packet Radio ServicesData rates up to ~ 115 kbpsMax: 8 timeslots used as any one timePacket switched; resources not tied up allthe timeContention based. Efficient, but variable

delaysGSM / GPRS core network re-used by WCDMA

GPRS

HSCSD

High Speed Circuit Switched DataDedicate up to 4 timeslots for data connection

~ 50 kbpsGood for real-time applications c.w. GPRSInefficient -> ties up resources, even whennothing sentNot as popular as GPRS (many skipping HSCSD)

EDGE

Enhanced Data Rates for Global

EvolutionUses 8PSK modulation3x improvement in data rate on shortdistancesCan fall back to GMSK for greaterdistancesCombine with GPRS (EGPRS) ~ 384 kbps

Can also be combined with HSCSD

WCDMA



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UMTS

• UMTS is the European vision of 3G.

• UMTS is an upgrade from GSM via GPRS or EDGE.• The standardization work for UMTS is carried out by Third

Generation Partnership Project (3GPP).

• Data rates of UMTS are:

– 144 kbps for rural

– 384 kbps for urban outdoor

– 2048 kbps for indoor and low range outdoor

• Virtual Home Environment (VHE)



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UMTS Network Architecture

Mobile St



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• UMTS network architecture consists of three

domains:

– Core Network (CN) : To provide switching, routing and

transit for user traffic.

– UMTS Terrestrial Radio Access Network (UTRAN) :

Provides the air interface access method for User

Equipment.

– User Equipment (UE) : Terminals work as air interfacecounterpart for Node B. The various identities are: IMSI,

TMSI, P-TMSI, TLLI, MSISDN, IMEI, IMEISV.

UMTS Network Architecture



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• Wide band CDMA technology is selected for UTRAN air

interface.• Base Station is referred to as Node-B and control equipment for

Node-B’s is called is called as Radio Network Controller (RNC).

– Functions of Node –B are:

• Air Interface Tx/Rx

• Modulation / Demodulation

– Functions of RNC are:

• Radio Resource Control

• Channel Allocation

• Power Control Settings

• Handover Control

• Ciphering

• Segmentation and Reassembly

UTRAN



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• UMTS Band : 1900-2025 MHz and 2110-2200 MHz for 3G transmission.• Terrestrial UMTS (UTRAN) : 1900-1980 MHz, 2010-2025 MHz, and 2110-

2170 MHz bands

UMTS Frequency Spectrum



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Yes, New W -CDMA handsets will work on

W-CDMA at 2Mbps, EDGE n/w at 384

Kbps, GPRS n/w at 144 Kbps. GSM n/w at

9.9 Kbps. Older handsets will not work inW-CDMA.

Yes

Requires

completely

new base

stations

FDD5MHzW-CDMA

Yes, New handsets work on EDGE n/w at

384Kbps, GPRS n/w at 144Kbps, and

GSM n/w at 9.6 Kbps with tri -modephones. GSM and GPRS -only phones will

not work in EDGE n/w.

No

Requires new

transceivers at

base station.

Also, software

upgrade to the

BSC & BTS

FDD200KHzEDGE

Yes, New GPRS handsets work on GPRS

n/w at 171.2Kbps, 9.6 Kbps on GSM n/w

with dual mode phones. GSM only phones

will not work in GPRS n/w.

No

Requires new

packet overlayincluding

routers and

gateways

FDD200KHzGPRS

Yes, New HSCSD handsets provide

57.6Kbps on HSCSD n/w and 9.6 Kbps on

GSM n/w with dual mode phones. GSM

only phones will not work in HSCSD N/w.

No

Requires

Software

Upgrade at

base station

FDD200KHzHSCSD

Requires New Handsets

Requires

New

Spectrum

Infrastructure

ChangeDuplex

Channel

BW

Wireless

Data

Tech

IMPACT ON EXISTING NETWORK

21 final 3g copy

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