The requirements of a third-generation radio transmission system inclu
de support for multimedia services, global roaming, operation in multi
ple environments both fixed and mobile, and high-speed data services.
The cdma2000 radio transmission technology (RTT) is based on the evolu
tion of the current cdmaOne system to a multimedia system that offers
additional capacity and service enhancements. While meeting the requi
rements of a third-generation wireless system, the cdma2000 RTT mainta
ins backward compatibility with currently deployed cdmaOne networks wo
rldwide, providing a smooth migration path from second- to third-gener
ation systems.