Challenges for efficient communication in underwater acoustic sensor networks
ACM SIGBED Review - Special issue on embedded sensor networks and wireless computing
Focused beam routing protocol for underwater acoustic networks
Proceedings of the third ACM international workshop on Underwater Networks
ICIMT '09 Proceedings of the 2009 International Conference on Information and Multimedia Technology
DBR: depth-based routing for underwater sensor networks
NETWORKING'08 Proceedings of the 7th international IFIP-TC6 networking conference on AdHoc and sensor networks, wireless networks, next generation internet
VBF: vector-based forwarding protocol for underwater sensor networks
NETWORKING'06 Proceedings of the 5th international IFIP-TC6 conference on Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; Mobile and Wireless Communications Systems
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In underwater wireless sensor networks (UWSNs), flooding-based routing protocols are preferred for reducing routing overhead. In addition to routing, a transport protocol should operate to provide the end-to-end reliability in USWNs. Fortunately, the Fast Retransmit technique can be exploited for fast retransmissions of lost DATA segments. However, if it operates over the flooding-based routing protocols, each source node will receive multiple copies of ACKs which are transmitted along different paths. Since the source node cannot distinguish between these multiple copies of ACK segments and real duplicate ACK segments (defined as an ACK indiscretion problem in this paper), unnecessary retransmissions are performed. In this paper, we therefore propose a new Fast Retransmit technique to address the ACK indiscretion problem. In our proposed technique, the sink records a new count number into a header, informing how many duplicate ACK segments have been transmitted from the sink. The source nodes becomes aware of the number of duplicate ACK segments transmitted from the sink and can perform the Fast Retransmit correctly.