The ITU-developed data rate requirements were defined according to the degree of mobility involved when a 3G call is made. As such, the data rate available over 3G will depend on the environment the call is being made in:
High Mobility
144 kbps for rural outdoor mobile use. This data rate is available for environments in which the 3G user is traveling more than 120 kilometers per hour (km/h) in outdoor environments such as in a train or car (vehicular traffic).
Full Mobility
384 kbps for pedestrian users traveling less than 120 km/h in urban outdoor environments.
Limited Mobility
At least 2 Mbps with low mobility (less than 10 km/h) in stationary indoor and short-range outdoor environments. These maximum data rates illustrated the potential for 3G technology and are available only in stationary indoor environments.