An adaptive end‐to‐end RTO calculation framework for DTNs with scheduled connectivity
International Journal of Satellite Communications and Networking(2018)
摘要
In this work, we propose an end‐to‐end retransmission framework for dynamically calculating
efficient retransmission time‐out intervals in delay‐tolerant networks (DTNs) with
scheduled connectivity. The proposed framework combines deterministic and statistical
information about the network state to calculate worst‐case estimates about the expected
round trip times. Such information includes connectivity schedules, convergence layer
protocols specifics, communication link characteristics, and network statistics about
the maximum expected packet error rates and storage congestion. We detail the implementation
of the proposed framework within the end‐to‐end application data conditioning layer
proposed for the DTN architecture, realized by the Delay‐Tolerant Payload Conditioning
protocol, as part of the Interplanetary Overlay Network–DTN reference implementation,
and evaluate its performance in a complex deep‐space emulation scenario in our DTN
testbed. Our results show that our approach achieves great accuracy in round‐trip
time estimations and, therefore, faster retransmissions of lost data, in comparison
to the statically configured retransmission mechanism of the original Delay‐Tolerant
Payload Conditioning protocol. As a result, in‐order data reception rate and storage
requirements on the receiver side are significantly improved, at minimum or even zero
extra cost in transmission overhead due to duplicate transmissions.
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关键词
conditioning layer,Delay‐Tolerant Payload Conditioning protocol,Delay‐/Disruption‐Tolerant Networking,end‐to‐end reliability,retransmission time‐out,scheduled connectivity
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