  In the current DVB generation, satellite terminals are expected to be
interactive and capable of transmission in the return channel with satisfying
quality. Considering the bursty nature of their traffic and the long
propagation delay, the use of a random access technique is a viable solution
for such a Medium Access Control (MAC) scenario. In this paper, random access
communication design in DVB-RCS2 is considered with particular regard to the
recently introduced Contention Resolution Diversity Slotted Aloha (CRDSA)
technique. This paper presents a model for design and tackles some issues on
performance evaluation of the system by giving intuitive and effective tools.
Moreover, dynamic control procedures that are able to avoid congestion at the
gateway are introduced. Results show the advantages brought by CRDSA to
DVB-RCS2 with regard to the previous state of the art.
