A Propagation-delay-tolerant Collision Avoidance Protocol for Underwater Acoustic Sensor Networks

Underwater acoustic sensor networks can be employed by a vast range of applications, retrieving accurate and up-to-date information from underneath the water surface. Although widely used by radios in terrestrial sensor networks, radio frequencies do not propagate well underwater. Acoustic channels are therefore employed as an alternative to support long-distance and low-power communication underwater, even though such channels suffer from long propagation delay and very limited bandwidth. In this paper, we investigate the impact of the large propagation delay on the throughput of selected classical MAC protocols and their variants, and show that protocols need to be revised to accommodate large propagation delay in order to achieve good throughput. We then introduce a propagation-delay-tolerant collision avoidance protocol named PCAP and show that by taking into account the propagation delay, PCAP offers higher throughput than the protocols that are widely used by conventional wireless communication networks.

[1]  Geoffrey G. Xie,et al.  A network layer protocol for UANs to address propagation delay induced performance limitations , 2001, MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295).

[2]  Charles E. Perkins,et al.  Ad-hoc on-demand distance vector routing , 1999, Proceedings WMCSA'99. Second IEEE Workshop on Mobile Computing Systems and Applications.

[3]  Robert Szewczyk,et al.  System architecture directions for networked sensors , 2000, ASPLOS IX.

[4]  V. Rodoplu,et al.  An energy-efficient MAC protocol for underwater wireless acoustic networks , 2005, Proceedings of OCEANS 2005 MTS/IEEE.

[5]  S. Shahabudeen,et al.  Design of networking protocols for shallow water peer-to-peer acoustic networks , 2005, Europe Oceans 2005.

[6]  Dario Pompili,et al.  Underwater acoustic sensor networks: research challenges , 2005, Ad Hoc Networks.

[7]  P.R. Atkins,et al.  A routing and channel-access approach for an ad hoc underwater acoustic network , 2004, Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600).