RES539 – 339 – MOD RESOLUTION 539 (REV.WRC-15) Use of the frequency band 2 605-2 655 MHz in certain Region 3 countries by non-geostationary satellite systems in the broadcasting-satellite service (sound) The World Radiocommunication Conference (Geneva, 2015), considering a) that the frequency band 2 535-2 655 MHz is allocated under No. 5.418 to the broadcasting-satellite service (BSS) (sound) in certain Region 3 countries; b) that the provisions of Resolution 528 (Rev.WRC-15) currently limit the use of this frequency band by systems in the BSS (sound) to the upper 25 MHz of the frequency band; c) that, prior to WRC-2000, there were no coordination procedures applicable to non-geostationary (non-GSO) BSS (sound) systems in this frequency band in relation to other non-GSO or GSO satellite networks; d) that satellite technology has now advanced to the stage where non-GSO systems in the BSS (sound) are technically and economically feasible when operated with high elevation angles and that there are practical designs available to ensure that the radiation of the non-GSO satellite in the BSS (sound) outside the main beam is kept at low levels; e) that satellite systems in the BSS as described in considering d) can be used for the delivery of high-quality, spectrally efficient BSS (sound) to portable and mobile terminals; f) that non-GSO systems in the BSS (sound) in the frequency band 2 630-2 655 MHz in Region 3 have been notified to ITU and are expected to be brought into use in the near future; g) that, prior to WRC-2000, the protection of existing terrestrial services was addressed through the coordination procedures of No. 9.11; h) that the provision cited in considering g) may be inadequate to ensure the future deployment of terrestrial services in this frequency band; i) that a regulatory procedure is required in order to meet the dual objectives of providing adequate long-term protection to existing and planned terrestrial services while not placing undue constraints on the development and implementation of the non-GSO BSS (sound) system; j) that there are non-GSO systems being planned for operation in the BSS (sound) in the frequency band 2 605-2 655 MHz in Region 3 that have highly elliptical orbits; k) that ITU-R has undertaken studies of the likely aggregate interference from a number of co-frequency broadcasting-satellite systems sharing with the terrestrial services on a co-primary basis; l) that ITU-R has undertaken studies that assumed there is only one satellite active at any time in a non-GSO system operating in a highly elliptical orbit,