Adaptive access and rate control of CSMA for energy, rate, and delay optimization

作者：Khodaian Mahdi; Perez Jesus^*; Khalaj Babak H; Crespo Pedro M

来源：EURASIP Journal on Wireless Communications and Networking, 2012, 27.

DOI：10.1186/1687-1499-2012-27

• adaptive control
• dynamic programming
• wireless channel
• CSMA

In this article, we present a cross-layer adaptive algorithm that dynamically maximizes the average utility function. A per stage utility function is defined for each link of a carrier sense multiple access-based wireless network as a weighted concave function of energy consumption, smoothed rate, and smoothed queue size. Hence, by selecting weights we can control the trade-off among them. Using dynamic programming, the utility function is maximized by dynamically adapting channel access, modulation, and coding according to the queue size and quality of the time-varying channel. We show that the optimal transmission policy has a threshold structure versus the channel state where the optimal decision is to transmit when the wireless channel state is better than a threshold. We also provide a queue management scheme where arrival rate is controlled based on the link state. Numerical results show characteristics of the proposed adaptation scheme and highlight the trade-off among energy consumption, smoothed data rate, and link delay.

• 出版日期2012