NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Rising Above the Cloud - Toward High-Rate Delay-Tolerant Networking in Low-Earth OrbitThe High Data Rate Architecture (HiDRA) project is implementing a High-rate Delay Tolerant Networking (HDTN) capability that can support Low Earth Orbit (LEO) applications and environments. The present state of the effort, future work, and other elements of the work to date are described in this paper. This implementation is intended to support applications that run at 1+ Gbps, per the requirements of modern optical and high-frequency RF links. Uniquely, this implementation is also tuned to support relay and data trunking applications, which might require support for large numbers of small bundles per second. The design for this platform is based entirely on commercial-off-the-shelf (COTS) components, and possesses buffering capabilities in the 5 TB range. This document takes results from previous individual tests and integrates them to demonstrate results in the presence of a coherent use-case: consider a network aboard the ISS which intends to utilize an upcoming optical communications capability. For this use-case, orbital analysis software is used to analyze orbital dynamics, from which a list of access times are generated that might take in to account weather, schedule competition, etc. A variant of Contact Graph Routing (CGR) is applied to these windows to determine an optimal schedule. This schedule is then loaded into the HDTN prototype and, in conjunction with various measurement tools, a complete end-to-end analysis of HDTN's performance is conducted. Various bottlenecks (including storage) are identified: these bottlenecks are expected to help us focus our future work on the elements of the system that are most likely to present issues moving forward. Finally, we discuss possible paths for evolution beyond the present rates supported by the system, including (but not limited to) hardware acceleration.
Document ID
20190032573
Document Type
Conference Paper
Authors
Hylton, Alan (NASA Glenn Research Center Cleveland, OH, United States)
Raible, Daniel (NASA Glenn Research Center Cleveland, OH, United States)
Clark, Gilbert (NASA Glenn Research Center Cleveland, OH, United States)
Dudukovich, Rachel (NASA Glenn Research Center Cleveland, OH, United States)
Tomko, Brian (NASA Glenn Research Center Cleveland, OH, United States)
Burke, Laura (NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
November 7, 2019
Publication Date
October 29, 2019
Subject Category
Communications and Radar
Report/Patent Number
GRC-E-DAA-TN74025
Meeting Information
International Communications Satellite Systems Conference (ICSSC)(Okinawa)
Funding Number(s)
WBS: 227985.04.05.03.01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Technical Review
Single Expert

Available Downloads

NameType 20190032573.pdf STI