Transcript JAXA DTN status update
JAXA DTN Status update -
NASA/JAXA Interoperability Testing Oct., 2013 JAXA Kiyohisa Suzuki / Shinichi Inagawa CCSDS San Antonio meeting
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JAXA DTN Status
1. Major Objective for JAXA DTN testing activity
The main objective is DTN technical demonstration under actual/simulated spacelink delay and disruption environment.
JAXA planned and conducted joint DTN test activity with NASA under the bilateral agreement for joint DTN activity.
Test Phase JAXA Internal Ground testing NASA/JAXA Ground testing JAXA Internal DRTS/DSS testing NASA/JAXA DRTS/DSS testing Target DTN functions
CFDP over DTN BSS over DTN Phase-1 Completed before Dec. 2011
Phase-2 Completed before Boudreaux meeting
CGR Phase-1 Completed with CU-Boulder.
Dec.-Jan. 2012
Phase-2 Completed before Phase-2, June 2013 Completed Boudreaux meeting July 2013@ TKSC Completed Test configuration
Internal LAN JAXA nodes Internet JAXA nodes JAXA nodes JAXA nodes JAXA nodes DRTS DRTS NASA nodes JAXA nodes NASA nodes 2
JAXA DTN Status
2. Delay and Disruption Considered A) Delay
Simulated propagation and processing delay are embedded in ground testing.
Actual propagation and processing delay are embedded in DRTS/DSS testing.
B) Disruption
Predictable disruption
A predictable disruption is an invisibility between visible paths of a spacecraft.
Unpredictable disruption
An unpredictable disruption is an intermittent invisibility in a visible path caused by effect of radio interference and/or heavy rain attenuation.
Simulation of rain attenuation process (only planned for DRTS/DSS testing)
• The rain attenuation process is represented by mutation of RF level along time axis • caused by heavy rain attenuation in the view of high-frequency spacelink.
A number of rain attenuation processes are simulated wherein tuning down/up the noise portion of C/N is performed at ground terminal.
Actual rain attenuation (only planned for DRTS/DSS testing : Extra item)
• Actual rain attenuation is the actual RF level mutations along time axis caused by • heavy rainfall. JAXA plans to demonstrate this disruption in “thunder storm” or “typhoon” situation, if Ops situation would permit …..
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JAXA DTN Status
3. Ground Testing Phase-2 (Items completed) JAXA/NASA DTN ground testing phase-2 was a precursor testing for DRTS/DSS testing.
Terrestrial joint demonstration for Contact Graph Routing (CGR) with Contact Plan which enables autonomous multipoint-to-multipoint DTN communication under simulated delay and disruption environment.
Terrestrial joint demonstration for DTN streaming communication (BSS: Bundle Streaming Service), which is a capability study of future usage.
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JAXA DTN Status
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4. DRTS/DSS testing (Items completed except extra item)
A Spacelink joint demonstration for entire protocol suite (stack) of SSI (Solar System Internet) which are considered by CCSDS such as: CFDP/DTN BP/DTN LTP/CCSDS ENCAP/CCSDS AOS/CCSDS CH&Codin/RF Joint demonstration for CFDP file transfer ,Contact Graph Routing, and BSS Confirmation for disruption tolerance under simulated / natural rain attenuation 5
JAXA DTN Status
8. Findings A) Some bugs found for ION implementation during 4-5 months
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3.1.0 (original baseline)-> 3.1.1 -> 3.1.2 ->3.1.3 (final for DRTS test) B) Interoperability / Cross Support point of view
Distribution and updating contact plan • In the case of distribution and updating contact plan, need some considerations between agencies who have different security • policy.
Even if on terrestrial internetwork, applications which both could • use were limited.
For example, we could not use FTP/sFTP. We could use only CFDP/DTN. A kind of protocol standard would be needed.
Expanding DTN NW management ? Alternative protocols we are not considering now(such as CSTS on terrestrial)? BSP or LTP with authentication will be covered all over nodes?
C) Disruption in physical layer (RF and mod)
Could confirm disruption tolerance such as simulated attenuation.
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