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Joshua Deaton

Publications and source records attributed to Joshua Deaton.

7 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS2022

Developing High Performance Space Networking Capabilities for the International Space Station and Beyond

A performance optimized implementation of Delay Tolerant Networking (DTN) with the capacity of gigabit-per second rates is developed for the International Space Station (ISS) and missions demanding large amounts of communications bandwidth. An overview of the High-rate Delay Tolerant Networking (HDTN) architecture and support for different convergence layers is provided. This paper then presents an overview of the testing and integration efforts to evaluate interoperability and capability in relevant environments. The first was interoperability testing with DTN Marshall Enterprise (DTNME) which resulted in near-gigabit per second data rates. This was followed by ISS emulation testing with the Software Development and Integration Laboratory (SDIL) at the Lyndon B. Johnson Space Center (JSC) and local testing based on the ISS DTN network topology. The local tests resulted in the discovery of potential sources of performance loss in the network and demonstrated near-gigabit rates between HDTN and DTNME.

Daniel Raible↗
NASA NTRS2021

BPv6 and BPv7 Coexistence in Delay Tolerant Networking (DTN)

As DTN has progressed since its inception in 2002, the community stabilized around Bundle Protocol version 6 (BPv6). This protocol was standardized by the RFC 5050’s definition of BPv6 and was later standardized and refined for space operations by the CCSDS Bundle Protocol Specification. After the release of RFC 5050, a variety of implementations and missions used BPv6 and noted several improvements that could be made to the protocol. These improvements culminated in a push to release a new protocol version, BPv7. Unfortunately, the vast improvements and difference in encoding that separates BPv7 from BPv6 also makes the two versions inherently incompatible. Consequently, there is an issue implementing BPv7 in existing systems while continuing support for BPv6 implementations. In response to this issue, two solutions emerge: (1) Bundle-in-Bundle Encapsulation (BIBE), a capability that wraps a bundle in another bundle for shipping between intermediary nodes, and (2) version agnostic DTN implementations. These concepts have been proven out in the MSFC DTN implementation known as DTNME.

Joshua Deaton↗
NASA NTRSDate not supplied

HOSC DTN Overview

Explore the source record for details and available documents.

Ivica Ristovski↗
NASA NTRSDate not supplied

Advances in High-rate Delay Tolerant Networking On-board the International Space Station

The High-rate Delay Tolerant Networking (HDTN) project at the NASA John H. Glenn Research Center (GRC) is developing a performance optimized Delay Tolerant Networking (DTN) implementation which is able to provide reliable multigigabit per second automated network communications for near-Earth and deep space missions. To that end, this paper provides an overview of the testing and integration efforts culminating in a high-rate DTN demonstration onboard the International Space Station (ISS). Over several years, the HDTN team has performed a series of end-to-end tests between the Software Development and Integration Laboratory (SDIL) at the Lyndon B. Johnson Space Center (JSC) and Marshall Space Flight Center’s Huntsville Operations Support Center (HOSC). The testing has focused on a realistic emulation of the ISS Ku-band RF link, which operates at a maximum of 500 Mbps downlink with a 600 ms round-trip time. In this environment, the HDTN onboard gateway has been tested for interoperability with ISS payload nodes and the DTN ground gateway, store and forward capability, reliable transport using the Licklider Transmission Protocol (LTP), and successful recovery from unexpected loss of signal. In addition to integration testing, HDTN has developed a series of software engineering practices to ensure the stability and maturity of the implementation. As the result, HDTN has successfully demonstrated high-rate DTN services onboard the ISS. This paper concludes with a summary of preliminary flight testing results from the Integrated LCRD LEO User Modem and Amplifier Terminal networking experiments.

Delay tolerant networking↗