Post on 09-Apr-2018
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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