This paper examines TCP's energy consumption behavior over wireless links and suggests improvements that result in significant energy savings. The various modifications and fine-tunings to TCP code suggested here help in conserving battery power at nodes by saving on software overhead and reducing protocol processing. These modifications were tested with experiments done on three laptops equipped with 11Mbps Lucent WaveLAN wireless cards. The results obtained from these experiments indicate that, with certain modifications made in the implementation of TCP code, one can attain as much as a 25% improvement in TCP's efficiency for the same amount of energy consumed. This work is ongoing and as a next step the authors will examine the energy behavior of TCP in more complex wireless environments.
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