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157 results on '"Carlo Caini"'

1. Mars to Earth Data Downloading: A Directory Synchronization Approach

Author

Marco Bertolazzi and Carlo Caini

Subjects
delay-/disruption-tolerant networking, inter-planetary internet, bundle protocol, directory synchronization, Information technology, T58.5-58.64
Abstract

This paper aims to present a possible alternative to direct file transfer in “challenged networks”, by using DTNbox, a recent application for peer-to-peer directory synchronization between DTN nodes. This application uses the Bundle Protocol (BP) to tackle long delays and link intermittency typical of challenged networks. The directory synchronization approach proposed in the paper consists of delegating the transmission of bulk data files to DTNbox, instead of modifying source applications to interface with the API of a specific BP implementation, or making use of custom scripts for file transfers. The validity of the proposed approach is investigated in the paper by considering a Mars to Earth interplanetary environment. Experiments are carried out by means of Virtual Machines running ION, the NASA-JPL implementation of DTN protocols. The results show that the directory synchronization approach is a valid alternative to direct transfer in interplanetary scenarios such as that considered in the paper.

Published
2019
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47. Packet Layer Erasure Coding in Interplanetary Links: The LTP Erasure Coding Link Service Adapter

Author

Tomaso de Cola, Carlo Caini, Marco Raminella, Nicola Alessi, Alessi, Nicola, Caini, Carlo, De Cola, Tomaso, and Raminella, Marco

Subjects
Computer science, Automatic repeat request, Licklider Transmission Protocol, Propagation delay, Aerospace Engineering, Data_CODINGANDINFORMATIONTHEORY, 02 engineering and technology, 0203 mechanical engineering, Delay-/Disruption-Tolerant Networking (DTN), Parity check codes, Forward error correction, Electrical and Electronic Engineering, Low-density parity-check code, Ions, 020301 aerospace & aeronautics, business.industry, Network packet, Adapter (computing), ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Interplanetary Networking (IPN), Delay-/Disruption-Tolerant Networking (DTN), LTP, upper-layer-FEC, Low Density Parity Check codes (LDPC), Low Density Parity Check codes (LDPC), upper-layer-FEC, Encoding, Transport protocols, Interplanetary Networking (IPN), LTP, business, Erasure code, Decoding methods, Computer network
Abstract

Interplanetary networks are affected by long propagation delays, intermittent connectivity, possible packet losses due to residual errors, and other impairments. To cope with these challenges, the delay-/disruption-tolerant networking (DTN) architecture utilizes the Licklider transmission protocol (LTP) as convergence layer on space links. The LTP reliable service (red) relies on Automatic Repeat reQuest, but very long propagation delays make packet layer forward error correcting (PL-FEC) codes very appealing to protect LTP segments from losses. The key advantage of FEC is that LTP retransmissions would be limited to the unlikely case of decoding failures. To this end, a new FEC-based protocol, to be inserted immediately below LTP, the erasure coding link service adapter (ECLSA), is presented here. ECLSA is completely transparent to LTP, relies on two alternative external libraries for coding/decoding, LibecDLR and OpenFEC, both using low density parity check codes and it is fully integrated with the ION DTN software package of NASA-JPL. This paper aims to provide a solid description of ECLSA, including features functional in a real deployment (such as the dynamic selection of codes). Performance is evaluated at the end of the paper, with nearly ideal results. ECLSA is released as free software and is already included in the “contrib” section of ION.

Published
2020

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