Japan is considering a mission communications to mobile terminals (MSS, or Mobile Satellite Service) from a satellite. This mission called for the moment STICS (Satellite / Terrestrial Integrated mobile Communication System) would provide additional land to the cellular network for remote areas (like many mountain areas of Japan, its many islands or vessels located on the high seas), but especially for the areas "classics" in the case where terrestrial networks are rendered inoperative by a natural disaster. The satellite will be able to communicate with mobile terminals the size of existing phones, rather than the large and dedicated terminals that

are used by the constellations currently in use. It is also planned to use the satellite service to alert the user, and in this context, the system must be capable of transferring data files such as images. Currently, Japan can provide alerts (tsunami, mainly, and in future earthquakes) with its ground network, as most towns and villages are equipped with speakers that allow such information to recipients (75% of villages equipped with this office in March 2008). The satellite STICS, placed on a geostationary orbit would provide communications services in S-band (around 2.6 GHz). It is anticipated that using a large deployable antenna in orbit (30 meters in diameter) of the kind that are currently used on the ETS-VIII mission. Of the R & D have already started at NICT (National Institute of Information and Communications Technology) on technology-sharing frequency between the ground and in space (frequency control cooperative, and dynamic network control) and l 'avoidance of interference between these two segments (amplifiers anti-saturation techniques for reducing side lobes, technology training multiple beams (between 100 and 200), technologies for the allocation of resources). Remember that the technology satellite ETS-VIII (Kiku-8 renamed) by JAXA (Japan Aerospace Exploration Agency) was launched in December 2006 to validate in-orbit technologies that will achieve future operational missions MSS. Several pilot experiments using ETS-VIII have been pursued in collaboration with NICT or other Japanese organizations.