Combined Random/Reservation Access for Packet Switched Transmission Over a Satellite with On-Board Processing: Part I - Global Beam Satellite
- 1 October 1983
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Communications
- Vol. 31 (10), 1161-1171
- https://doi.org/10.1109/tcom.1983.1095742
Abstract
A combined random/reservation multiple access (CRRMA) scheme for packet-switched communication over a global beam satellite with on-board processing is proposed and analyzed. Channel time is divided into contiguous slots; each slot contains N minislots for transmission of request packets and N' minislots for data. With N substantially smaller than the number of earth stations, collisions will occur in request packet transmissions. Two channel access algorithms for the CRRMA model are proposed: uncontrolled channel access (UCA) and controlled channel access (CCA). UCA is simpler but has an inherent stability problem particularly when the number of minislots N is small. The CCA algorithm restricts the transmission of request packets for new arrivals to take place only when the slot is in the FREE state. With N = 3 , the CCA algorithm exhibits good delay-throughput characteristics. As N increases, the UCA algorithm offers stable operation. For N \geq 5 the simpler UCA algorithm is preferred over CCA.Keywords
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