Transcript 1 - S T A F F

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
?
Europe
Japan
USA
Korea
China
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
2010 MHz
ITU “IMT-2000”
IMT 2000
2025 MHz
1885 MHz
Europe
GSM 1800 DECT
UMTS
MSS
1980 MHz
1880 MHz
1919.6 MHz
IMT 2000
MSS
2110 MHz
UMTS
MSS
2170 MHz
MSS
2170 MHz
2250
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
Micro Cell 0.5 km
Macro Cell 5-10 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?
CN
Iur
RNC
RNC
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
UE
ME
MT
TE
USIM
Cc
UTRAN/CN
TA
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