MOBILE COMMUNICATION 1946 - 1960s 1980s 1990s 2000s Appeared 1G 2G 3G Analog Digital Digital MultiMulti Unified Standard Standard Standard Terrestrial Terrestrial Terr. & Sat
MOBILE COMMUNICATION INTERNATIONAL MOBILE TELECOM 2000. ( IMT-2000) IMT A FUTURE STANDARD IN WHICH A SINGLE INEXPENSIVE MOBILE TERMINAL CAN TRUELY PROVIDE COMMUNICATIONS ANY TIME AND ANY WHERE THIRD GENERATION (3 G ) STANDARD
Integration of Satellite and Terrestrial Systems. Enhanced Security Performance. Global Seamless Roaming. Data Rates up-to 2 Mbps – for Indoor Environment. Flexible Radio Bearer for Increased Spectrum Efficiency. Wide Range of Telecommunication Services ( Voice, Data, Multi-media, Internet ). Multiple Radio Environments ( Cellular,, cordless, satellite) ). Common Spectrum Worldwide ( 1.8 – 2.2 GHz band ). IMT-2000 VISION
Data Rates up-to 2 Mbps – for fixed or Indoor Environments. High speed Packet data services. Multimedia support. Backward compatibility with second generation ( 2G ) systems. Improved system capacity. Key Requirements of 3G Services Data Rates up-to 384 kbps – for pedestrian or urban Environments. Data Rates up-to 144 kbps – for wide area mobile Environments.
PSTN MSC BSC BTS IWF WWW Enterprise Network VPN IP Backbone Cdma One Network Terminal
Software Upgrade PSTN Software Upgrade01010 New Software01010 New Software01010 MSC BSC BTS IWF PDSN WWW Enterprise Network VPN IP Backbone New packet data router Channel card upgrade Cdma2000 1x Evolution New Terminal
Spreading Rate 1 ( 1x ). New Terminology in CDMA2000 Transmit Diversity. Spreading Rate 3 ( 3x ). Radio Configuration.
Different Radio Configuration (RC’s) for different radio environments. Key Features Of CDMA2000 RC 1 through RC 9 on the FL. ( RC 1 through RC 5 in 1x ) RC 1 through RC 6 on the RL. ( RC1 through RC 3 in 1x ) Radio Configuration (RC’s) define Rate Set, Spreading Rate, Channel Coding ( Turbo or Convolutional ), Channel Coding rate, Modulation, Transmit Diversity for Forward or Reverse traffic channel.
Key Features Of CDMA2000 Variable length Walsh Codes 4 to 128 for variable data rates. Pilot in reverse link. Transmit Diversity. Transmit Diversity is an optional feature that improves the performance in certain radio environments by transmitting forward signal on multiple antennas.
Spreading Rate 1 and Spreading Rate 3 Also called 1x. Both forward and reverse channel use single direct sequence spread carrier with a chip rate of 1.2288 Mcps. Spreading Rate 1 Also called 3x or MC ( Multi Carrier ). Forward channels use three direct sequence spread carriers with a chip rate of 1.2288 Mcps. Spreading Rate 3 Reverse channels use a single direct sequence spread carrier with a chip rate of 3.6864 Mcps.
Enhanced Capacity – 38 users/Sector/FA. Advantages Of CDMA2000 1x Enhanced data rates upto 153 Kbps in Release A. It can go up- to 307 Kbps in Release B. Still higher data rates up-to 2.4 Mbps with 1x EV-DO.
Commercial Systems CDMA 2000 1x Release A are available. Current Status Of CDMA2000 1x Technical Specification for CDMA 2000 1x Release B are under finalization stages. Currently out of total 26m 3G subscribers world over 25.5m are on CDMA 2000 1x. Some 5-6 operators are having CDMA 2000 1x network. Major operators are Sprint, Verizon in USA and Monet Telecom in South Korea.
Evolution to 3G – The Carrier’s Choice 1995199920002001 2002 Nearly Doubles Voice, 307k, RF backward compatible Data only 2.4 Mbps RF backward compatible Voice, 14.4kVoice, 64k Voice, 9.6k Data only 10-60k Voice, 128k/384k 100k GSM (Europe) CDMA CDMA2000 1x IS-95A GPRS EDGE WCDMA CDMA2000 1xEV-DO IS-95B 2003 2004 Evolution of CDMA Networks