UMTS Mohamed Mokdad Ecole d’Ingénieurs de Bienne.
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Transcript of UMTS Mohamed Mokdad Ecole d’Ingénieurs de Bienne.
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UMTS
Mohamed Mokdad
Ecole d’Ingénieurs de Bienne
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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
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Bit Rate Evolution
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IMT-2000 families
IMT-2000
UMTS – 3GPP CDMA-2000 ?
EuropeJapanUSA
KoreaChina
USA USA
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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
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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
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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
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IMT-2000 = IT&T integration
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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
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Remember
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Spread spectrum or not?
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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
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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
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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
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Swiss Case
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UMTS technology
• Architecture Overview
• UMTS Network Architecture Overview
• Universal Terrestial Radio Access Network– UTRAN Architecture
• Core Network Architecture
• Protocol Architecture
• Understanding Different Channels Types
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UMTS Cells
Mega Cell >10 km Macro Cell 5-10 KmMicro Cell 0.5 km Pico Cell 100 m
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U-MSC
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Node B and RNC
RNC = Radio Network COntroller
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UTRA = UTRAN?
UMTS Terrestrial Radio Access Network
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RNC to RNC?
RNCRNCIur
CN CN
RNCRNC
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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
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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.
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PS & CS Paths
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The Stack