Traffic-Adaptive, Flow-Specific Medium Access for Wireless Networks
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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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 energy efficient 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.
- Radio Communications