A Comparison Study of FBR and FBRD Protocols for Underwater Optical Wireless Communication Using Transporter Autonomous Underwater Vehicles.

Recently, underwater communication technology has been developing in many ways. Because signals are affected by a number of circumstances, communication interruptions are the fundamental problem in underwater communication. In this paper, we introduce transporter nodes, which can move linearly along with a particular Horizontal (H) or Vertical (V) line, and support message forwarding in Delay Tolerant Network (DTN) using Focused Beam Routing considering node Direction (FBRD) protocol for UOWC. We consider Horizontal Transporter (HT) and Vertical Transporter (VT) cases. From the simulation results, we found that for low angles the FBRD delivery probability increased and the overhead ratio is low. These conditions are very suitable for UOWC, because if we use narrow angle, it will increase communication distance. Also, the simulation results show that the overhead ratio of FBRD is lower than FBR through the range from 0 to 360 $$^\circ $$ , which can reduce the consumption power of communication in the underwater environment.