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Communication Dans Un Congrès Année : 2017

Making H-ARQ suitable for a mobile TCP receiver over LEO satellite constellations

Résumé

This paper investigates strategies to carry out delay tolerant services over LEO satellite constellations for mobile receiver. In this context , LEO constellations are characterized by important delay variations where propagation impairments are mostly localized on the Land Mobile Satellite (LMS) channel (i.e. on the last hop). To cope with this issue, distinct reliability schemes can be introduced at the physical or link layers. Although their capacity to cope with transmission errors has been demonstrated, these recovery schemes may induce a high jitter that could severely damage TCP's internal timers and reliability schemes. As a matter of fact, transport and link layers' reliability schemes exhibit a clear discrepancy. Following temporal traces representing the delay between a mobile terminal and the last hop satellite from a LEO constellation, we assess how HARQ mechanisms impact on the RTO based retransmission and the duplicate acknowledgments of TCP. Based on ns-2 simulations, we propose a layer-2 buffer that let both link and transport layers to con-jointly perform. Our evaluations show an end-to-end data rate increase and more generally illustrate the benefit of reordering packets at the link layer when link-layer erasure coding recovery mechanisms are used conjointly with TCP.
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Dates et versions

hal-02540331 , version 1 (10-04-2020)

Identifiants

  • HAL Id : hal-02540331 , version 1

Citer

Bastien Tauran, Emmanuel Lochin, Jérôme Lacan, Fabrice Arnal, Mathieu Gineste, et al.. Making H-ARQ suitable for a mobile TCP receiver over LEO satellite constellations. 9th EAI International Conference on Wireless and Satellite Systems (formerly PSATS), Sep 2017, Oxford, United Kingdom. ⟨hal-02540331⟩
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