10-01-2011, 02:35 PM
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TIJO T THOMAS
Beyond 3G services
Ultra Broadband wireless access
Narrow band services
Point to multipoint communications
IP telephony
Issues on Beyond 3G systems
4G systems need to satisfy
High data rate
High mobility
Seamless coverage
Critical Issues
Infrastructure difficulties
Small cell sizes
Maintenance cost
HAPS Definition
Defined by WRC in 1997
Station located on an object at an altitude of 20 to 50 km, fixed point relative to earth
Subscribers transmit information directly
Associated with Gateway stations on ground
