1. Software Defined Naval Network for Satellite Communications (SDN-SAT)
Sobhan Nazari, Pengyuan Du, Mario Gerla,
Ceilidh Hoffmann, Jae H. Kim, Antonio Caponet
Department of Computer Science, UCLA, USA

2. Outline Introduction Contribution SDN-SAT Framework
Performance Evaluation
Conclusion

3. Outline Introduction Contribution SDN-SAT Framework
Performance Evaluation
Conclusion

4. Introduction Naval Surface Fleet Communications
Ship-to-ship, ship-to-shore, ship-to-aircraft
Military or commercial satellite systems
GEO
LEO

5. Introduction Capacity is underutilized
Current Shipboard Network
Clients are served by a predefined satellite system
Configuration is fixed at service routers
Ship
Capacity is underutilized
Dynamic reconfiguration is limited (manual)

6. Contribution
Software-Defined Networking framework for naval SATellite networks (SDN-SAT)
Dynamic flow reallocation
Multipath routing
Quality of Service (QoS)
Multipath TCP (MPTCP)
Improved data transport via multiple paths
Failover

7. Outline Introduction Contribution SDN-SAT Framework
Performance Evaluation
Conclusion

8. SDN-SAT Control plane SDN controller
Shipboard SDN switch (supports flow tables)
Control channels are embedded in satellite systems

9. SDN-SAT SDN controller Satellite controllers
Resides on the ground or ship
Uses satellite controllers to allocate resources
Satellite controllers
One dedicated controller for each SATCOM

10. SDN-SAT
SDN Controller Architecture

11. SDN-SAT
Data plane
LAN
SDN switch
SATCOM channels
Ship

12. SDN-SAT
SDN-SAT Architecture

13. SDN-SAT Multipath TCP for SDN-SAT
LAN users are allowed to maintain several subflows
Possible even with one IP

14. Performance Evaluation
Simulation setup
Linux Ubuntu 14.04
Mininet emulator
Floodlight remote controller
Kernel MPTCP v0.90
Path manager: fullmesh, num_flows=2

15. Performance Evaluation
Scenario

16. Performance Evaluation
Multi path vs Single path
Three satellite systems with 1.544Mbps, 1.544Mbps, Mbps, RTT=500ms

17. Performance Evaluation
Multi path failover
MPTCP with SDN
The satellite system with 1.544Mbps fails

18. Performance Evaluation
MPTCP with three paths on three satellites variable delays
Equal path delay: 500ms
Non-uniform delays 1:
500ms, 200ms, 100ms
Non-uniform delays 2:
1000ms, 500ms, 200ms

19. Performance Evaluation
Case 1. Three MPTCP sessions
Case 2. Three single path TCP sessions

20. Conclusion SDN-SAT solution to Naval Satellite Communications
Flexible configuration of satellite services
Multipath transmission
Multipath TCP
Improve bandwidth utilization
Automatic failover
Future work
Larger naval satellite network
Resource allocation at SDN controller

21. Thanks!
Q&A

22. Simulation Results
Throughput of MPTCP without SDN

23. MPTCP Congestion Control Coupled congestion control [1]
Goal 1. Be fair to other TCP
Goal 2. Load balancing
Goal 3. Compensate different RTTs across sub-flows
[1]Raiciu, Costin, Damon Wischik, and Mark Handley. "Practical congestion control for multipath transport protocols." University College London, London/United Kingdom, Tech. Rep (2009).
[2]Khalili, Ramin, et al. "MPTCP is not pareto-optimal: performance issues and a possible solution." Proceedings of the 8th international conference on Emerging networking experiments and technologies. ACM, 2012.
[3] Peng, Qiuyu, Anwar Walid, and Steven H. Low. "Multipath TCP algorithms: theory and design." ACM SIGMETRICS Performance Evaluation Review41.1 (2013):

24. Satellite SDN Architecture
Bao, Jinzhen, et al. "OpenSAN: a software-defined satellite network architecture." ACM SIGCOMM Computer Communication Review. Vol. 44. No. 4. ACM, 2014.

25. Related Work High Bandwidth Delay Product TCP [1]
Hybla
Cubic
Westwood
Multipath TCP (MPTCP) [2]
Improve throughput
Soft handover [3]
[1] Caini, Carlo, Rosario Firrincieli, and Daniele Lacamera. "Comparative performance evaluation of tcp variants on satellite environments." ICC. IEEE, 2009.
[2] Ford, Alan, et al. Architectural guidelines for multipath TCP development. No. RFC
[3] Paasch, Christoph, et al. "Exploring mobile/WiFi handover with multipath TCP." CellNet. ACM, 2012.

26. Related Work
MPTCP
is an extension to TCP which lets you use multiple paths simultaneously
Path manager, scheduler
To manage a Multipath TCP connection that uses several paths
TCP subflows
To transport data
Congestion control
To control congestion over multiple paths

27. MPTCP socket Multipath TCP TCP1 TCP2 TCPn ... Application Application
Transport
TCP1
TCP2
TCPn
Network
...
Datalink
Physical

28. MPTCP Data transmission ABCDEF socket socket Multipath TCP
Two levels of sequence numbers
ABCDEF
socket
socket
Multipath TCP
Multipath TCP
Data sequence #
TCP1
TCP1
TCP1 sequence #
TCP2
TCP2 sequence #
TCP2

29. MPTCP in Satellite Network
The idea in [1]
The circled number 1-4 indicates the order of 4 handovers occurred to each sub-flow.
[1] Du, Pengyuan, Xiao Li, You Lu, and Mario Gerla. "Multipath TCP over LEO satellite networks.“ IWCMC. IEEE, 2015.

30. MPTCP in Satellite Network
On-demand Multipath Source Routing (OMSR)
Distributed protocol
=> control overhead
Lacks of inter-satellite signaling
=> route conflict
Devise a more sophisticated scheme
=> onboard processing
The circled number 1-4 indicates the order of 4 handovers occurred to each sub-flow.
[1] Du, Pengyuan, Xiao Li, You Lu, and Mario Gerla. "Multipath TCP over LEO satellite networks.“ IWCMC. IEEE, 2015.

31. Motivation Replace OMSR with Software-defined Networking (SDN) [1]
SDN splits the control and data plane
Centralize the design logic
Minimize onboard processing
Easier computation of disjoint paths
Contribution
MPTCP+SDN framework for LEO system
[1] Kreutz, Diego, et al. "Software-defined networking: A comprehensive survey." Proceedings of the IEEE 103.1 (2015):