The radiocommunication study groups are part of the ITU Radiocommunication Sector ( ITU-R ) , which is responsible for studying technical , operational and regulatory/ procedural questions on radiocommunication , issuing recommendations and preparing the technical basis for radiocommunication assemblies and world radiocommunication conferences . In particular , ITU-R has established standards for the detailed specifications of the radio interfaces of International Mobile Telecommunication-2000 ( IMT-2000 ) , the satellite component of which is comprised of six different interfaces .