This Recommendation identifies the IMT-2000 terrestrial radio interface specifications@ based on the output of activities outside ITU. These radio interfaces support the features and design parameters of IMT-2000@ including the capability to ensure worldwide compatibility@ international roaming@ and access to high-speed data services. This Recommendation is complemented by other ITU-R Recommendations and Reports on IMT-2000 that provide additional details on a number of aspects including frequency arrangements and unwanted emission characteristics.