In this paper we address datacast transmission over the Second Generation Digital Video Broadcasting via Satellite (DVB-S2). In particular, two novel cross-layer architectures are proposed and justified for a railway scenario that allow unicast services in addition to broadcast and multicast services. The architectures allow for Quality of Service (QoS) provision via cross-layer adaptation of the packet-level codes in use. The architectures can implement the two different link layer encapsulation protocols already available in the DVB family of standards: Multiple Protocol Encapsulation (MPE) and Generic Stream Encapsulation (GSE).
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