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

Outline Introduction Contribution SDN-SAT Framework Performance Evaluation Conclusion

Outline Introduction Contribution SDN-SAT Framework Performance Evaluation Conclusion

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

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)

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

Outline Introduction Contribution SDN-SAT Framework Performance Evaluation Conclusion

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

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

SDN-SAT SDN Controller Architecture

SDN-SAT Data plane LAN SDN switch SATCOM channels Ship

SDN-SAT SDN-SAT Architecture

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

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

Performance Evaluation Scenario

Performance Evaluation Multi path vs Single path Three satellite systems with 1.544Mbps, 1.544Mbps, 2.048Mbps, RTT=500ms

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

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

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

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

Thanks! Q&A

Simulation Results Throughput of MPTCP without SDN

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): 305-316.

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.

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 6182. 2011. [3] Paasch, Christoph, et al. "Exploring mobile/WiFi handover with multipath TCP." CellNet. ACM, 2012.

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

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

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

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.

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.

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): 14-76.