Title :
A QoS-Aware Underwater Optimization Framework for Inter-Vehicle Communication using Acoustic Directional Transducers
Author :
Baozhi Chen ; Pompili, Dario
Author_Institution :
Dept. of Electr. & Comput. Eng., Rutgers Univ., New Brunswick, NJ, USA
Abstract :
Underwater acoustic communications consume a significant 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 `best´ 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 - which increases exponentially with distance - 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 - which is implemented and compared with geographic routing solutions and delay-tolerant networking solutions using an emulator that integrates underwater acoustic WHOI Micro-Modems - exploits the frequency-dependent radiation pattern of underwater acoustic transducers to reduce communication energy consumption by adjusting the transducer directivity on the fly.
Keywords :
acoustic transducers; autonomous underwater vehicles; modems; quality of service; telecommunication network routing; telecommunication network topology; underwater acoustic communication; underwater sound; vehicular ad hoc networks; AUV; QoS-aware underwater optimization framework; acoustic directional transducer; communication energy consumption reduction; delay-tolerant networking solution; delaying packet transmission; energy conservation; frequency-dependent radiation pattern; frequency-selective underwater acoustic ambient noise; geographic routing solution; intervehicle communication; long data packet transmission; medium power absorption; mobile autonomous underwater vehicle; network topology configuration; power 10 W to 50 W; time 0.1 s to 1 s; trading end-to-end delay; underwater acoustic WHOI micromodem; underwater acoustic communication; Acoustics; Delays; Propagation losses; Sea surface; Trajectory; Transducers; Uncertainty; Underwater acoustic sensor networks; autonomous underwater vehicles; position uncertainty;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2014.031914.131203