SUMMARYThe paper discusses cross-layer issues of DVB-S2 networks with adaptive coding and modulation (ACM) on the physical layer forward link. Also future return channel via satellite (RCS) systems employing adaptive schemes on the return link are analysed. Cross-layer issues focus on medium access control (MAC) and encapsulation layer effects. Recent work of the S2 encapsulation over generic streams (GS) is described, and the effects on quality of service (QoS) scheduling for the forward link are analysed by means of simulation. A performance comparison between DVB-S and S2, both for transport streams (TS) and GS shows a significant gain by new encapsulation and fragmentation protocols that allow fragmentation across BBFrames. Here, realistic traffic scenarios with a mix of several services as well as rain fading are taken into account. For the return link, an adaptive scheme is discussed, going beyond the current RCS standard. Several approaches for access burst structures are presented and their impact on link efficiency through padding and encapsulation overhead is simulated. Finally, burst segmentation impact on jitter is investigated.
Integrated systems for provision of both operational and non-operational services are investigated in SANDRA (Seamless Aeronautical Networking through integration of DataLinks, Radios and Antennas). This ultimately comprises integration on the network layer which opposes the hardware segregation of operational and non-operational aeronautical domains. Segregation may in this case be achieved by IPsec which introduces significant overhead. This paper investigates the achievable bandwidth savings for future Air Traffic Services and Airline Operational Communications services through RObust Header Compression (ROHC) schemes for IPsec. Further, a ROHC scheme for IPsec with ESP NULL encryption for non-encrypted operational services is discussed.
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