RES761 – 411 – further recognizing a) that this conference has identified the frequency band 1 452-1 492 MHz for IMT on a worldwide basis; b) that compatibility studies need to be completed in order to establish appropriate sharing criteria between BSS (sound) and MS in the frequency band 1 452-1 492 MHz, resolves to invite ITU-R 1 to conduct, in time for WRC-19, the appropriate regulatory and technical studies, with a view to ensuring the compatibility of IMT and BSS (sound) in the frequency band 1 452-1 492 MHz in Regions 1 and 3, taking into account IMT and BSS (sound) operational requirements; 2 to prepare, inter alia, the regulatory action that could be taken, based on the studies carried out under resolves to invite ITU-R 1 above, in order to facilitate the long-term stability of IMT and BSS (sound) in the frequency band 1 452-1 492 MHz, invites the 2019 World Radiocommunication Conference to consider the above-mentioned results and to take necessary actions, as appropriate, invites Member States 1 to actively participate in the ITU-R activities with regard to the studies referred to above; 2 in Region 1, to use guidance from the ITU-R studies to determine the need for bilateral coordination between IMT systems and BSS earth stations, taking into account noting b), until WRC-19 defines regulatory and technical conditions for this bilateral coordination; 3 in Region 3, to use guidance from ITU-R studies to determine the need for bilateral coordination to protect BSS earth stations, taking into account noting b), until WRC-19 defines regulatory and technical conditions for this bilateral coordination, instructs the Director of the Radiocommunication Bureau to report to WRC-19, under agenda item 9.1, the results of the studies referred to in resolves to invite ITU-R 1.