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On the impact of link layer retransmission schemes on TCP over 4G satellite links

Kuhn, Nicolas and Lochin, Emmanuel and Lacan, Jérôme and Boreli, Roksana and Clarac, Laurence On the impact of link layer retransmission schemes on TCP over 4G satellite links. (2015) International Journal of Satellite Communications and Networking, 33 (1). 19-42. ISSN 1542-0973

(Document in English)

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/sat.1064/abstract


We study the impact of reliability mechanisms introduced at the link layer on the performance of transport protocols in the context of 4G satellite links. Specifically, we design a software module that performs realistic analysis of the network performance, by utilizing real physical layer traces of a 4G satellite service. Based on these traces, our software module produces equivalent link layer traces, as a function of the chosen link layer reliability mechanism. We further utilize the link layer traces within the ns-2 network simulator to evaluate the impact of link layer schemes on the performance of selected Transmission Control Protocol (TCP) variants. We consider erasure coding, selective-repeat automatic request (ARQ) and hybrid-ARQ link layer mechanisms, and TCP Cubic, Compound, Hybla, New Reno and Westwood. We show that, for all target TCP variants, when the throughput of the transport protocol is close to the channel capacity, using the ARQ mechanism is most beneficial for TCP performance improvement. In conditions where the physical channel error rate is high, hybrid-ARQ results in the best performance for all TCP variants considered, with up to 22% improvements compared to other schemes.

Item Type:Article
Additional Information:Thanks to Wiley editor. The definitive version is available at http://onlinelibrary.wiley.com/doi/10.1002/sat.1064/abstract
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National d'Études Spatiales - CNES (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > National ICT Australia - NICTA (AUSTRALIA)
Laboratory name:
Deposited On:18 Feb 2014 09:23

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