UMTS

Mohamed Mokdad

Ecole d’Ingénieurs de Bienne

GSM Evolution

• Licensing– Business spreading over boarders

• Technology– 1st Generation - 1G

• Analog cellular

– 2nd Generation - 2G• Multiple digital systems

– 3rd Generation - 3G• HSCSD, GPRS, EDGE (1/2 generation)• i.e. GSM Evolution

Bit Rate Evolution

IMT-2000 families

IMT-2000

UMTS – 3GPP CDMA-2000 ?

EuropeJapanUSA

KoreaChina

USA USA

SDOs and UMTS

• Europe– 3GPP– ETSI, ARIB, TTA, CWTS, T1 and TTC– W-CDMA interface = UTRA

• USA– US national standard– Compatible to IMT-2000, i.e. to UMTS– CDMA2000

IMT-2000 Families

• Total of 17 families in 1998– All accepted by ITU– 11 terrestrial and 6 via satellite

• The important ones– UMTS (W-CDMA)

• GSM successor

– CDMA2000 (TD-SCDMA)• AMPS/GSM successor

IMT-2000 criteria

• Used worldwide– Interoprability

• Used for all mobile applications

• PS and CS support– PS implies IP support

• Higher data rates– Up to 2 mbps: 144, 384 and 2048 kbps

• Higher sprectrum efficiency

IMT-2000 = IT&T integration

UMTS - the European system

• Main improvement– UTRA: UMTS Terrestrial Radio Access– W-CDMA for land mobile systems

• UTRA supports– TDD: Time Division Duplex

• For micro and pico cells– FDD: Frequency Division Duplex

• For wide area coverage– UTRA Multicarrier

Remember

Spread spectrum or not?

GSM-UMTS interoperability

• UTRAN– UTRA: UMTS Terrestrial Access Network

• GSM-Only– Access via Um interface

• GSM/UMTS– Access via Uu interface

• If no UMTS coverage– Access via Um with reduced bandwidth

Licensing

• More than one mobile operator– CH: Swisscom, Sunrise, Orange & Telefonica– Famous cases: Germany and UK

• Licensing– Auction (based just on money income)– Ethics (based on social aspects as well)

• UMTS issues– Very high investment and unknown revenue

Spectrum availability

1850 1900 1950 2000 2050 2100 2150 2200 2250

ITU “IMT-2000”

Europe

1885 MHz 2025 MHz

IMT 2000

UMTSGSM 1800 DECT MSS

1880 MHz 1980 MHz

2010 MHz

IMT 2000

MSSUMTS

2110 MHz

1919.6 MHz

2170 MHz

2170 MHz

MSS MSS

Swiss Case

UMTS technology

• Architecture Overview

• UMTS Network Architecture Overview

• Universal Terrestial Radio Access Network– UTRAN Architecture

• Core Network Architecture

• Protocol Architecture

• Understanding Different Channels Types

UMTS Cells

Mega Cell >10 km Macro Cell 5-10 KmMicro Cell 0.5 km Pico Cell 100 m

U-MSC

Node B and RNC

RNC = Radio Network COntroller

UTRA = UTRAN?

UMTS Terrestrial Radio Access Network

RNC to RNC?

RNCRNCIur

CN CN

RNCRNC

UMTS Interfaces bis

• RAN– Radio Access Network

• RAN Core Network– PS to Data CS to Circuit switched networks

• UE Node B: Uu (Um for GSM)

• Node B RNC: Iub

• RNC RNC: Iur (new to GSM)

• RNC GSM: Iu

UMTS Interfaces

TE TA

MT

ME

USIM

UE

UTRAN/CN

Cc R Uu

TA: Terminal Adaptor.MT: Mobile Termination.ME: Mobile Equipment.UE: User Equipment UTRAN: UMTS Radio Access Network.CN: Core Network.

PS & CS Paths

The Stack