Radio interface
Radio interface : System enabling a mobile terminal to communicate with the network. Numerous discussions were held within ETSI in 1997 on the standardization of a radio interface for UMTS. On 29 January 1998 the SMG committee adopted the UMTS Terrestrial Radio Access standard (UTRA). UTRA was adopted by the ITU in March 1999 as a radio interface standard for IMT 2000.