RES223 – 284 – invites ITU-R 1 to conduct compatibility studies in order to provide technical measures to ensure coexistence between MSS in the frequency band 1 518-1 525 MHz and IMT in the frequency band 1 492-1 518 MHz; 2 to develop harmonized frequency arrangements to facilitate IMT deployment in the frequency band 1 427-1 518 MHz, taking into account the results of sharing and compatibility studies; 3 to further study operational measures to enable the coexistence of IMT and radiolocation service in the frequency band 3 300-3 400 MHz; 4 to develop an ITU-R Recommendation providing technical and operational measures regarding adjacent band compatibility between IMT systems operating below 3 400 MHz and FSS earth stations operating above 3 400 MHz; 5 to further study adjacent band compatibility between IMT in the frequency band 3 300-3 400 MHz and radiolocation service below 3 300 MHz, in particular unwanted emissions of IMT systems in this frequency band; 6 to develop harmonized frequency arrangements for the frequency bands 3 300-3 400 MHz and 4 800-4 990 MHz for operation of the terrestrial component of IMT, taking into account the results of the sharing studies; 7 to study the technical and regulatory conditions for the use of IMT in the frequency band 4 800-4 990 MHz in order to protect the aeronautical mobile service; 8 to continue its studies on further enhancements of IMT, including the provision of Internet Protocol (IP)-based applications that may require unbalanced radio resources between the mobile and base stations; 9 to continue providing guidance to ensure that IMT can meet the telecommunication needs of the developing countries and rural areas in the context of the studies referred to above; 10 to include these frequency arrangements and the results of these studies in one or more ITU-R Recommendations.