Two Step Based QoS Scheduler for DVB-S2 Satellite System

The new DVB-S2 standard, introduced by ETSI, is mainly based on three key concepts: best transmission performance, total flexibility and reasonable receiver complexity. The Adaptive Coding and Modulation (ACM) scheme is the tecnique allowing to achieve these main goals. In particular, this tecnique allows to adapt the modulation and code levels, performed at the physical layer, at channel variations in a dynamic way. However, often the others modules, composing a satellite terrestrial terminal, does not take advantage of the ACM potentiality. For this purpose, in this paper we propose an efficient packet scheduling strategy able to operate with the different MODCOD schemes of ACM. In particular, considering ACM policy, Frame efficiency and QoS requirements the scheduling strategy has the main goal of maximizing the overall performances of the system.