1. ETR-NASA DTN Phase-1 Test Results

2. Test Items
Focus was on exercising the CCSDS File Delivery Protocol (CFDP) over Bundle Protocol (BP) and evaluating NASA’s ION DTN Implementation, including CFDP, BP and Licklider Transmission Protocol (LTP)
NASA DTN Engineering Network (DEN) was used for the testing, with nodes at JSC, ETRI and HanYang University (diagram on next slide)
Four kinds of CFDP tests were performed ID
Test Name
Test Objectives
CFDP-01
Fragmentation performance
To check CFDP file transfer performance at different fragmentation conditions (LTP Segment size and CFDP PDU size)
CFDP-02
Performance in link delay
To check CFDP performance in lunar link delay conditions (1.3 seconds one-way)
CFDP-03
Store & forward function
To check store-and-forward function of CFDP over BP with multiple hops and non-continuous contacts
CFDP-04
Re-transmission performance
To check re-transmission performance of LTP under packet loss rates of 0%, 1% and 5%

3. Delay and Drop Datagrams
Phase-1 Test Bed
Delay and Drop Datagrams
UDP IP
ETH. Frame
ETH. PHY
CFDP BP
LTP
UDP IP
ETH. Frame
ETH. PHY
CFDP BP
TCP IP
ETH. Frame
ETH. PHY BP
LTP
UDP
TCP IP
ETH. Frame
ETH. PHY
KPLO Spacecraft
ETRI
Space Link
NASA DEN (JSC)
DSN
NASA DEN (JSC)
KPLO MOC
HYU
Notes: 1. ION version was used on each DTN node
2. Contact rate (All Links) and LTP udplso rate (JSC<->ETRI) were limited to 5 Mbps

4. CFDP-01 CFDP-01: Fragmentation performance Fragmentations, file size
LTP segment size: 1.35KB, 16KB, 64KB
CFDP PDU size: 1KB, 10KB, 64KB
File size: 100KB, 1MB, 10MB
Measured parameters
Throughput, File checksum value
Network configuration
ETRI/HYU node: Source or destination
NASA DEN(JSC): Relay node

5. CFDP-01 Throughput measurement
End-to-End throughput were measured with bpdriver/bpcounter command (100 bundles equal to CFDP PDU size)
Path: ETRI→JSC→HYU, HYU→JSC→ETRI
For different CFDP PDU size
Throughput
(Mbps)
LTP segment size (KB)

6. LTP segment size (No Aggregation)
CFDP-02
CFDP-02: Performance in link delay
Link delay: 1.3 sec. in DEN (only on JSC<->ETRI Link)
Measured parameters
Throughput (100 bundles equal to CFDP PDU size)
File checksum value
LTP segment size (No Aggregation)
CFDP PDU size
Path
File size
Checksum Validated
Throughput (Mbps)
16KB
64KB
ETRI→JSC→HYU
100KB OK
2.383
1MB
10MB
HYU→JSC→ETRI
1.376

7. LTP segment size (No Aggregation)
CFDP-03
CFDP-03: Store & forward function
Contact schedule
LTP segment size (No Aggregation)
CFDP PDU size
Path
File size
Checksum Validated
16KB
64KB
ETRI→JSC→HYU
100KB OK
1MB
10MB
HYU→JSC→ETRI

8. CFDP-04 CFDP-04: Re-transmission performance Link conditions
Delay: 1.3 sec. in DEN (only on JSC<->ETRI Link)
Packet loss control: 0%, 1%, 5% in DEN (only on JSC<->ETRI Link)
Measured parameters
Throughput (100 bundles equal to CFDP PDU size)
File checksum value
For different LTP segment size
Throughput
(Mbps)
Fixed Value
CFDP PDU size: 64KB
File size: 10MB
Packet Loss Rate (%)

9. Summary Phase-1 Testing Summary Phase-2 Test Plans
All CFDP tests between ETRI-JSC-HYU were successful
Had some DEN configuration and throughput issues that delayed testing some, but were able to work around the problems
CFDP-01 showed that larger CFDP PDU sizes improve throughput, with small differences in varying the LTP segment size
CFDP-02 showed that BP/LTP can handle lunar delays
CFDP-03 showed that CFDP/BP can successfully operate over multiple hops with non-continuous contacts, demonstrating store-and-forward
CFDP-04 showed that in the presence of data loss, smaller LTP segments improve throughput
Phase-2 Test Plans
Evaluate Additional DTN Applications: Asynchronous Message Service (AMS) and Bundle Streaming Service (BSS)
Evaluate Additional DTN capabilities: Bundle Protocol Security (BPSec) and Asynchronous Management Protocol (AMP) [TBC]

10. Thank you!