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This paper describes the services, market, business and architecture analysis done in the EU IST personal and mobile satellite project SATIN for S-UMTS. The service suitable for the S-UMTS is identified through market analysis and the profitability of the identified service is investigated through business analysis. Based on the profitable services and the intermediate module and terminal complexity and cost, the S-UMTS system architecture is selected. As part of the SATIN architecture scenario, the intermediate module concept is discussed as well.

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In this paper a new technique for radio resource management applicable to dynamic satellite networks for multimedia applications is presented. It uses a dynamic channel reservation policy to map the application specific requirements for accepting and maintaining a call. A new service classification scheme is proposed for the future wireless multimedia systems. According to this, the definition of each service class is based on a range of different performance criteria for the call blocking and call dropping rates. This approach can be used for future multi-beam dynamic satellite constellation networks. It is based on the assumption that the user terminal inter spot-beam handoff times can be accurately predicted by the network during the call set-up phase. The call admission controller takes into account the performance requirements of the established connections and the affect of accepting a new call on the same spot-beam as well as the handover attempts from the neighbouring spot-beams. A simulation model was developed in OPNET modeler and statistics for the call blocking and call dropping probabilities under various traffic conditions were recorded. Simulation results for a typical Medium Earth Orbit (MEO) and a Low Earth Orbit (LEO) constellation are presented and the performance of the new algorithm is discussed. It is shown that this new approach gives a great flexibility to dynamically map different service classes requirements into the network performance characteristics.