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Open Access Publications from the University of California

Improving Carrier-Sense Multiple Access Using Cues of Channel Utilization

  • Author(s): Garcia-Luna-Aceves, J.J.
  • et al.

A simple  variation of Carrier Sense Multiple Access (CSMA), CUE-CSMA (for Channel Utilization Estimation), is introduced in which the  transmission-persistence  probability is a function of the perceived average length of idle periods, which is used as a  cue of channel utilization. Nodes need not know or estimate the number of nodes in the network. A simple analytical model is used to derive the throughput of CUE-CSMA and compare it with non-persistent and 1-persistent CSMA without having to assume saturation mode as several prior studies have done. The model considers the effect of  acknowledgments  (ACK) and  receive-to-transmit turnaround times. The results clearly show that using estimates of  average idle periods as  simple cues of  channel utilization  can provide the benefits of 1-persistent CSMA at light loads and match or outperform non-persistent CSMA at higher loads.

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