Analysis of Aeronautical Gateway ProtocolCurtis KelseyUniversity of Missouri

Overview• Introduction• Method• Experiment• Results• Conclusion• Summary

Introduction• Aeronautical Networks

are unique• Mixture of static &

dynamic nodes• Extremely high speed

nodes• Custom network stack

is necessaryDynamic airborne environment

Introduction• ANTP• AeroTP (TCP)• AeroNP (IP)• AeroRP (Routing)• AeroGW*

• AeroGW Converts• TCP AeroTP• IP AeroNP• Link/MAC iNET MAC• PHY iNET PHY

Introduction• Conversions Occur:• Ground Stations• Aeronautical Nodes

• Possible Overhead Implications• Less data transferred• Communication windows lost

• Most Significant Delay• Egress conversion from MAC to IP (Similar to ARP)• Egress is not constrained by time due to node movement

Method• Does delay caused by the conversion

process result in excessive data loss?• Implementation of entire suite beyond the

scope of one semester• Implement a network simulation• Use additional delay as control variable• Analyze data delivery

ns3 Setup• http://www.nsnam.org/wiki/index.php/Installation• Virtualbox or Hyper-V• Requirements• Gcc/g++ > 3.4• Python• Mercurial• Bazaar• Etc…

• Downloading• clone http://code.nsnam.org/ns-3-allinone• wget http://www.nsnam.org/release/ns-allinone-3.13.tar.bz2

ns3 Setup• Build• ./build.py –enable-examples –enable-tests

• Configure• ./waf -d debug --enable-examples --enable-tests configure

• Test• ./test.py –c core

• Run a Project• ./waf –run <my_project>

Experiment Model• 10 Airborne Nodes/Routing Nodes

(Wireless)• Random Walk• Random Speed

• 5 Ground Stations (Access Point)• Random Location

• GS to Internet Direct Link• 100Mbps• 2ms delay

Experiment Model• 1 Destination Internet Node (Wired)• 100Mbps• 1/10/100/1000ms delay

• Traffic• 100-1kb packets/10 seconds• UDP

• Zone• 1000 x 1000 area

Experiment Construction

• PointToPointHelper• Handles Wired/Wireless Bridge

• CsmaHelper• Handles wired nodes

• WifiHelper• Handles wireless nodes

• MobilityHelper • Handles AN and RN Mobility

Experiment Construction

• Packet capture enabled• AP• Csma (Wired)•Wireless Nodes

Results • Simulation ran for • 1ms additional delay• 10ms additional delay• 100ms additional delay• 1000ms additional delay

• At Wireless Network Edge

Results • Packets captured at •Wireless AP (Ground Station)•Wired Node

• Pcap file processed with Tcpdump & sent to log files• Tcpdump –nn –tt –r (pcap file) > (log file)

Results 3• How many of the 100

packets got delivered?

Wired Node

Wireless Nodes

Results• 1ms• 100% packet delivery• No delay between transmit/receive

• 10ms• 100% packet delivery• No delay between transmit/receive

• 100ms• 100% packet delivery• No delay between transmit/receive

• 1000ms• 100% packet delivery• No delay between transmit/receive

Conclusion• Delay implemented on wired node does

not affect traffic across point to point link•Move delay variable to p2p link

• Random walk & speed for wireless nodes is not causing dropped packets• Expand zone & define a high velocity

• Amount of data transferred needs to be increased• Illustrates dropped connections

References• (Primary Paper) E. K. ¸Cetinkaya and J. P. G. Sterbenz. Aeronautical Gateways: Supporting

TCP/IP-based Devices and Applications over Modern Telemetry Networks. In Proceedings of the International Telemetering Conference (ITC), Las Vegas, NV, October 2009.

• Cetinkaya, E., & Rohrer, J. (2012). Protocols for highly-dynamic airborne networks. Proceedings of the 18th annual international conference on Mobile computing and networking, 411–413. Retrieved from http://dl.acm.org/citation.cfm?id=2348597

• Narra, H., Cetinkaya, E., & Sterbenz, J. (2012). Performance analysis of AeroRP with ground station advertisements. Proceedings of the first ACM …, 43–47. Retrieved from http://dl.acm.org/ft_gateway.cfm?id=2248337&ftid=1233995&dwn=1&CFID=118936837&CFTOKEN=41922410

• Sterbenz, J., Pathapati, K., Nguyen, T., & Rohrer, J. (2011). Performance Analysis of the AeroTP Transport Protocol for Highly-Dynamic Airborne Telemetry Networks. Retrieved from http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=ADA544743

• J. P. Rohrer, E. Perrins, and J. P. G. Sterbenz. End-to-end disruption-tolerant transport protocol issues and design for airborne telemetry networks. In Proceedings of the International Telemetering Conference (ITC), San Diego, CA, October 2008

• A. Jabbar, E. Perrins, and J. P. G. Sterbenz. A cross-layered protocol architecture for highly-dynamic multihop airborne telemetry networks. In Proceedings of the International Telemetering Conference (ITC), San Diego, CA, October 2008.

Summary• Introduction• ns3 setup• Experiment Construction• Results• Conclusion• Summary

Questions?