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This paper proposes a novel demand sensitive model (DSM) for tuning price service over SDMB (satellite digital multimedia broadcast) system offering a price discount to large amount of users while maintaining profit for the service provider. The discounted price is determined based on a marginal decision rule using a simple pseudo-linear function of the weight factor and the number of users. For testing the proposed model, an integrated satellite-terrestrial network architecture offering SDMB services to mobile users through the satellite or terrestrial UMTS segment, has been utilized. Simulations have been carried out to show the goodness of the proposed model within the system architecture; moreover the model, based on simple parameters, is very flexible and can be easily integrated in a "price adapter" module making the offered service attractive for end users and in the same time profitable for the satellite operator.