Foreword The role of the Radiocommunication Sector is to ensure the rational@ equitable@ efficient and economical use of the radio-frequency spectrum by all radiocommunication services@ including satellite services@ and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy functions of the Radiocommunication Sector are performed by World and Regional Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups.