Stability, Throughput, and Delay of Asynchronous Selective Reject Aloha

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19 Scopus citations


An analytical performance evaluation model is presented for selective reject (SREJ) ALOHA, a recently proposed high-capacity protocol for unslotted channels with high propagation delay. SREJ-ALOHA approaches the theoretical asynchronous multiaccess throughput limit of 0.368 for fixed or variable length message traffic, using subpacketization of messages in conjunction with a selective reject retransmission policy. A finite user flow equilibrium-based model for SREJ-ALOHA with variable length messages is derived and used to characterize stability, throughput, and delay. Particular attention is given to the development of a stability analysis methodology for unslotted ALOHA-type protocols with variable length transmissions. Numerical results based on a satellite channel example are presented to demonstrate the significant performance advantages offered by SREJ-ALOHA, even after accounting for realistic subpacket overheads. Copyright š 1987 by The Institute of Electrical and Electronics Engineers, Inc.

Original languageEnglish (US)
Pages (from-to)767-772
Number of pages6
JournalIEEE Transactions on Communications
Issue number7
StatePublished - Jul 1987
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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