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<p>This dissertation pioneers the concept of traffic-adaptive, flow-specific medium access and demonstrates that it
outperforms contention, non-contention and hybrid techniques. The novel traffic-adaptive Cooperative Wireless Sensor
Network Medium Access Control (CWS-MAC) scheme is proposed and shown to provide better throughput and delay
performance than slotted, non-persistent carrier sense multiple access (CSMA), upon which the IEEE 802.11 standard is based,
and time division multiple access (TDMA). A general model for traffic-adaptive, flow-specific medium access control is
developed and hybrid, contention and non-contention schemes are shown to be special cases.
This work also compares the energy efficiency of centralized and distributed solutions and proposes an energyefficient
version of traffic-adaptive CWS-MAC that includes an adaptive sleep cycle coordinated through the use of preamble
sampling. A preamble sampling probability parameter is introduced to manage the trade-off between energy efficiency and
throughput and delay performance.
Finally, this research quantifies the effect of large propagation delays on contention and contention-free medium
access and proposes a flow-specific medium access scheme for networked satellite systems that is based on traffic-adaptive
CWS-MAC and is shown to outperform both CSMA- and TDMA-based solutions.
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<br>Subjects: Flow-specific; Traffic-adaptive; Cross layer; Medium access control; Wireless; Energy-efficiency; Preamble sampling; Networked satellite systems</div>
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Walker, T. Owen, III</div>
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