1. Technology Features Core Network 1G 2G 2.5G 3G 4G AMPS (FDMA)
Analog voice
Very low data
PSTN 2G
CDMA
TDMA
GSM
Digital voice
kbps
Short messages
2.5G
GPRS
EDGE
1xRTT
Up to 384 kbps (average kbps)
Packet data
PSTN, Packet network 3G
CDMA2000
W-CDMA
(IMT-2000)
Superior voice quality
Up to 2 Mbps (average kbps)
Multimedia capabilities
Packet network, Internet Protocol 4G
????
Up to 100 Mbps for high mobility
Up to 1 Gbps for low mobility
Multiple technology hand-off
Internet Protocol

2. Comparison between 2G , 2.5G & 3G

4. Features includes: - Phone calls - Voice mail - Receive simple email messages
Features includes: - Phone calls/fax - Voice mail -Send/receive large messages - Web browsings - Navigation/maps - New updates
Features includes: - Phone calls/fax - Global roaming - Send/receive large messages - High-speed Web Navigation/maps Videoconferencing - TV streaming - Electronic agenda meeting reminder.
Speed: 144kb/sec-2mb/sec
Speed: 10kb/sec
Speed: kb/sec
Time to download a 3min MP3 song: min
Time to download a 3min MP3 song: 6-9min
Time to download a 3min MP3 song: 11sec-1.5min

5. Key Characteristics of IMT-2000
Parameter
CDMA2000 1X
CDMA2000 3X
UWC-136/ Edge
TD-CDMA
W-CDMA
Carrier Spacing
1.25 MHz
3.75 MHz
30 kHz
200 kHz
5 MHz
Duplex Method
FDD
TDD
Access Techniques
CDMA
TDMA
TDMA/ CDMA
Data Rates
Up to 600 kbps
Up to 2 Mbps
Up to 20 kbps
Up to 380 kbps
Modulation Type
QPSK/ BPSK
π/4-DQPSK
8-PSK
GMSK/
QPSK
HPSK

6. IMT Goal
Anytime, anywhere, anyone – the deployment of IMT-2000 systems started around the year 2000
IMT-Advanced capabilities, which extend and enhance IMT-2000, are expected to include:
Higher data rates
Improved roaming
True inter-system mobility management
Greater flexibility to support many different types of services simultaneously (example: symmetrical, asymmetrical & unidirectional services)

7. IMT Evolving Capabilities
IMT-2000 original minimum requirements for radio technology evaluation:
144 kbit/s for vehicular high speed
384 kbit/s for medium speed, and
2048 kbit/s for indoor and low speed
Currently the standards support up to Mbit/s and further enhancements are being developed
Research targets for IMT-Advanced deployment after 2010:
100 Mbit/s for high mobility
1Gbit/s for low mobility

8. IMT Evolving Relationships
Along with the future development of IMT systems, relationships will continue to develop between different communications and radio access systems. Ex:
Wireless personal area networks (WPANs)
Local area networks (LANs and WLANs)
Digital broadcast
Fixed wireless access
Systems will increasingly be designed as a combination of different access technologies
Will provide a common and flexible service platform for different services and applications
Key driver for this convergence is the increasing prevalence of IP-based applications

9. Variety of Access Networks for IMT-Advanced
New radio interface(s)
Research Goals:
100 Mbit/s full mobility
1 Gbit/s low mobility