RES767 – 424 – ADD RESOLUTION 767 (WRC-15) Studies towards an identification for use by administrations for land-mobile and fixed services applications operating in the frequency range 275-450 GHz The World Radiocommunication Conference (Geneva, 2015), considering a) that a number of bands in the frequency range 275-1 000 GHz are identified for use by administrations for passive services, such as the radio astronomy service, the Earth exploration-satellite service (passive) and the space research service (passive); b) that No. 5.565 states that the use of the range above 275 GHz by the passive services does not preclude use of this range by active services; c) that administrations wishing to make available frequencies in the 275-1 000 GHz range for active service applications are urged to take all practicable steps to protect these passive services from harmful interference until the date when the Table of Frequency Allocations is established for the relevant frequencies; d) that active devices which can operate at frequencies above 275 GHz are available due to technology developments; e) that studies on technical and operational characteristics of some active services operating in the range 275-1 000 GHz have been carried out by the ITU Radiocommunication Sector (ITU-R); f) that the technical and operational characteristics of land-mobile and fixed services operating in the bands above 275 GHz have not been specified, and further studies are required; g) that propagation characteristics of the frequencies above 275 GHz are being studied by ITU-R Study Group 3; h) that propagation models for the land-mobile and fixed services operating in the band above 275 GHz are required; i) that sharing and compatibility studies between land-mobile, fixed and passive services identified by No. 5.565 operating in the band above 275 GHz are required, noting a) that Question ITU-R 228-1/3 addresses the study of which propagation models best describe the relationship between atmospheric parameters and electromagnetic wave characteristics on terrestrial links operating at frequencies above 275 GHz; b) that Question ITU-R 235-1/7 addresses the study of the technical and operational characteristics of systems operating at frequencies above 275 GHz within the science services;