The Scheduled-Retransmission Multiaccess (SRMA) Protocol for Packet Satellite Communication

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)1319-1324
Journal / PublicationIEEE Transactions on Information Theory
Issue number6
Publication statusPublished - Nov 1989
Externally publishedYes


An improvement of the announced retransmission random access (ARRA) protocol for packet satellite communication called the scheduled retransmission multiaccess (SRMA) protocol is introduced. Besides avoiding the collisions between new and retransmitted packets, the improved protocol can also eliminate reservation conflicts from different slots. Explicit acknowledgment is used so that traffic to other zones served by the same satellite can also be accommodated. Assuming three percent of the channel capacity is used for retransmission reservation, the fixed-and dynamic-frame SRMA's can achieve effective maximum throughputs of 0.65 and 0.89, respectively. Both protocols can give average delays considerably lower than slotted Aloha even when the throughput is as low as 0.2. © 1989 IEEE