Evaluations and Optimizations of CSMA-Based Protocols Considering Energy-Efficient Wireless Personal Area Networks

Abstract

For the efficiency of multiple access in wireless communication department, the carrier sense multiple access schemes have been deeply studied with various attempts of random backoff mechanisms. The key parameters to be mainly considered can be taken into account the number of active devices and the slot number of contention window, which can sensitively affect the performance of those schemes. These tradeoff factors can have complemental relation, because high slot number can accommodate high number of active devices with low probability of radio collisions but can aggravate bandwidth performance in low traffic environment, and vice versa. For deducting the optimal parameters, I adopt and analyze these key parameters in each transmission time with stochastic process, and show the results by numerical examples with the difference between representative protocols.