ST-MAC: Spatial-Temporal MAC Scheduling for Underwater Sensor Networks

Underwater sensor networks (UWSNs) have attracted a lot of attention recently. Since data in UWSNs are transmitted by acoustic signals, the characteristics of a UWSN are different from those of a terrestrial sensor network. In other words, the high propagation delay of acoustic signals in UWSNs causes spatial-temporal uncertainty, and makes transmission scheduling in UWSNs a challenging problem. Hence, in this paper, we propose a spatial-temporal MAC scheduling protocol, called ST-MAC, which is designed to overcome spatial-temporal uncertainty based on TDMA-based MAC scheduling for energy saving and throughput improvement. We construct the spatial-temporal conflict graph (ST-CG) to describe the conflict delays among transmission links explicitly, and model ST-MAC as a new vertex coloring problem of ST-CG. We then propose a novel heuristic, called the traffic-based one-step trial approach (TOTA), to solve the coloring problem. In order to obtain the optimal solution of the scheduling problem, we also derive a mixed integer linear programming (MILP) model. Finally, we present a comprehensive performance study via simulations. The results show that ST-MAC can perform better than existing MAC schemes (such as S-MAC, ECDiG, and T-Lohi) in terms of the network throughput and energy cost.

[1]  M.J. Ryan,et al.  A Propagation-delay-tolerant Collision Avoidance Protocol for Underwater Acoustic Sensor Networks , 2006, OCEANS 2006 - Asia Pacific.

[2]  Ian Holyer,et al.  The NP-Completeness of Edge-Coloring , 1981, SIAM J. Comput..

[3]  Jiejun Kong,et al.  The challenges of building mobile underwater wireless networks for aquatic applications , 2006, IEEE Network.

[4]  G. Acar,et al.  ACMENet: an underwater acoustic sensor network protocol for real-time environmental monitoring in coastal areas , 2006 .

[5]  Bhaskar Krishnamachari,et al.  Understanding spatio-temporal uncertainty in medium access with ALOHA protocols , 2007, Underwater Networks.

[6]  Dominique Fober,et al.  Clock Skew Compensation over a High Latency Network , 2002 .

[7]  Dario Pompili,et al.  Challenges for efficient communication in underwater acoustic sensor networks , 2004, SIGBED.

[8]  V. Rodoplu,et al.  UWAN-MAC: An Energy-Efficient MAC Protocol for Underwater Acoustic Wireless Sensor Networks , 2007, IEEE Journal of Oceanic Engineering.

[9]  Kee Chaing Chua,et al.  Aloha-Based MAC Protocols with Collision Avoidance for Underwater Acoustic Networks , 2007, IEEE INFOCOM 2007 - 26th IEEE International Conference on Computer Communications.

[10]  V. Pangboonyanon,et al.  Managing Heterogeneous Access Networks Coordinated policy based decision engines for mobility management , 2007 .

[11]  Yuan Li,et al.  Research challenges and applications for underwater sensor networking , 2006, IEEE Wireless Communications and Networking Conference, 2006. WCNC 2006..

[12]  Wayne L. Winston.  Introduction to Mathematical Programming: Applications and Algorithms , 1990 .

[13]  Jeffrey V. Nickerson,et al.  Incorporating Environmental Information into Underwater Acoustic Sensor Coverage Estimation in Estuaries , 2007, MILCOM 2007 - IEEE Military Communications Conference.

[14]  Deborah Estrin,et al.  An energy-efficient MAC protocol for wireless sensor networks , 2002, Proceedings.Twenty-First Annual Joint Conference of the IEEE Computer and Communications Societies.

[15]  L. Freitag,et al.  Acoustic Communications for Regional Undersea Observatories , 2002 .

[16]  Prasant Mohapatra,et al.  A hybrid medium access control protocol for underwater wireless networks , 2007, WuWNet '07.

[17]  M. Stojanovic,et al.  Underwater acoustic networks , 2000, IEEE Journal of Oceanic Engineering.

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

[19]  S. Singh,et al.  The WHOI micro-modem: an acoustic communications and navigation system for multiple platforms , 2005, Proceedings of OCEANS 2005 MTS/IEEE.

[20]  John S. Heidemann,et al.  T-Lohi: A New Class of MAC Protocols for Underwater Acoustic Sensor Networks , 2008, IEEE INFOCOM 2008 - The 27th Conference on Computer Communications.

[21]  Hwee-Xian Tan,et al.  Distributed CDMA-based MAC Protocol for Underwater Sensor Networks , 2007 .

[22]  M. Stojanovic,et al.  Slotted FAMA: a MAC protocol for underwater acoustic networks , 2006, OCEANS 2006 - Asia Pacific.

[23]  John G. Proakis,et al.  Evolution of Seaweb underwater acoustic networking , 2000, OCEANS 2000 MTS/IEEE Conference and Exhibition. Conference Proceedings (Cat. No.00CH37158).

[24]  Geoffrey G. Xie,et al.  A Networking Protocol for Underwater Acoustic Networks , 2000 .

[25]  Michele Zorzi,et al.  Modeling the underwater acoustic channel in ns2 , 2007, Valuetools 2007.

[26]  Li Yin,et al.  Transmission Scheduling in Sensor Networks via Directed Edge Coloring , 2007, 2007 IEEE International Conference on Communications.

[27]  John S. Heidemann,et al.  Time Synchronization for High Latency Acoustic Networks , 2006, Proceedings IEEE INFOCOM 2006. 25TH IEEE International Conference on Computer Communications.