An Optimum Retransmission Cut-Off Scheme for Slotted ALOHA

Authors:
Jahangir H. Sarker;Seppo J. Halme
Affiliations:
Communications Laboratory, Institute of Radio Communications, Helsinki University of Technology, P.O. Box 2300, FIN-02015 HUT, Finland E-mail: Jahangir.Sarker@hut.fi;Communications Laboratory, Institute of Radio Communications, Helsinki University of Technology, P.O. Box 2300, FIN-02015 HUT, Finland E-mail: Seppo.Halme@hut.fi
Venue:
Wireless Personal Communications: An International Journal
Year:
2000

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Abstract

The retransmission cut-off is not needed for a stable operation of slottedALOHA if the new packet generation rate is below a critical limit. Thethroughput never reaches its maximum value if the new packet generation rateis less than this critical limit irrespective of the number of transmissions.The maximum throughput is attained by adjusting the number of transmissions,pertaining to the new packet generation rate exceeding the critical limit.A complete analysis for the new packet generation rate with the properadjustment of the number of transmissions that maximize the channel throughputin a Rayleigh fading channel is executed. A stable operating region in termsof the packet rejection probability and the corresponding number oftransmissions is devised.