kumoh national institute of technology
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Routing TCP Flows in Underwater Mesh Networks
By : 관리자
Date : 2013-11-21
Views : 579

Due to the growing importance of coastline surveillance and protection, underwater communication is playing an
increasingly important role in military networks. As compared to
terrestrial networks, large propagation delays and low data rates
are fundamental characteristics of underwater communication.
Furthermore, due to some key differences in the factors causing
fluctuations in the quality of the underwater channels, the
corresponding communication links experience more prolonged
data rate changes as compared to those in terrestrial networks. Large propagation delays and prolonged link data rate
deteriorations severely degrade the end-to-end performance of
Transmission Control Protocol (TCP) based applications. Since
military applications often require the reliable data delivery
provided by TCP, it is important to devise solutions to alleviate
this problem.
In this paper, we propose a new routing scheme called
Linear Coded Digraph Routing(LCDR) to enhance the end-toend throughput of TCP based packetflows in underwater mesh
networks. LCDR is a fully distributed scheme designed to locally
respond to changes in the link data rates. In LCDR, each ingress
node forwards packets after network coding. Each intermediate
node adaptively uses network coding before forwarding the
packets to the outgoing links. Each terrestrial gateway decodes
the network coded packets before forwarding them to terrestrial
networks. Each node adapts its packet forwarding rate based
on the available bandwidth on the outgoing links, such that the
terrestrial gateway can successfully receive packets with higher
probability without significantly affecting cross-traffic. The effectiveness of the proposed scheme is evaluated using simulation.
The simulation results show that the proposed scheme uses the
spare bandwidth on each link efficiently and it significantly improves end-to-end throughput of TCP flows.
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