@conference {122,
	title = {QUO VADIS: QoS-aware Underwater Optimization Framework for Inter-vehicle Communication using Acoustic Directional Transducers},
	booktitle = {Proc. of IEEE Conference on Sensor, Mesh and Ad Hoc Communications and Networks (SECON)},
	year = {2011},
	month = {June},
	address = {Salt Lake City, UT, USA},
	abstract = {Underwater acoustic communications consume a sig- nificant amount of energy due to the high transmission power (10 - 50 W) and long data packet transmission times (0.1 - 1 s). Mobile Autonomous Underwater Vehicles (AUVs) can conserve energy by waiting for the {\textquoteleft}best{\textquoteright} network topology configuration, e.g., a favorable alignment, before starting to communicate. Due to the frequency-selective underwater acoustic ambient noise and high medium power absorption {\textendash} which increases exponentially with distance {\textendash} a shorter distance between AUVs translates into a lower transmission loss and a higher available bandwidth. By leveraging the predictability of AUV trajectories, a novel solution is proposed that optimizes communications by delaying packet transmissions in order to wait for a favorable network topology (thus trading end-to-end delay for energy and/or throughput). In addition, the solution proposed {\textendash} which is implemented and compared with other solutions using an emulator that inte- grates underwater acoustic WHOI Micro-Modems {\textendash} exploits the frequency-dependent radiation pattern of underwater acoustic transducers to reduce communication energy consumption by adjusting the transducer directivity on-the-fly.},
	author = {B. Chen and D Pompili}
}
