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In TDMA-based MAC (media access control) protocols for satellite network access, slotted ALOHA which has been widely deployed in Very Small Aperture Terminal (VSAT) systems. More recently, Generalized Retransmission Announcement Protocol (GRAP) was proposed in , which regroups the immediate access by contention at low loads and the reservation access at higher loads to achieve a better efficiency. Inspired by GRAP, we propose a new MAC protocol (CA-GRAP) using cumulative acknowledgment (CA)doi:10.1109/icc.2003.1204006 dblp:conf/icc/Zhu003a fatcat:kbtnshu7qzgz7cc7lgocr4px6q