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One-Hop Out-of-Band Control Planes for Low-Power Multi-Hop Wireless Networks

One-Hop Out-of-Band Control Planes for Low-Power Multi-Hop Wireless Networks. Chaojie Gu N anyang Technological University Rui Tan Nanyang Technological University Xin Lou Advanced Digital Sciences Center, Illinois at Singapore Dusit Niyato Nanyang Technological University.

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One-Hop Out-of-Band Control Planes for Low-Power Multi-Hop Wireless Networks

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  1. One-Hop Out-of-Band Control Planes for Low-Power Multi-Hop Wireless Networks Chaojie Gu Nanyang Technological University Rui TanNanyang Technological University Xin Lou Advanced Digital Sciences Center, Illinois at Singapore Dusit Niyato Nanyang Technological University

  2. Low-Power Multi-Hop Wireless Networks • Ad hoc & easy deployment, good scalability • Centralized network control • WirelessHART (used in >8,000 industrial systems) • ISA100.11a

  3. In-band vs Out-of-Band In-band control plane Out-of-band control plane X X X X Undesirable coupling • Lose control in data-plane failures No coupling • Simple and resilient

  4. Related work • Bandwidth aggregation • Homogeneous radio: FatVAP [NSDI’08], FastForward [MASS’13] • Heterogeneous radios: MultiNets [TECS’14], Multipath TCP [MobiCom’16] Improve throughput rather than optimality, manageability • Out-of-band control plane • WASP [ANCS’14] • Wi-Fi Direct: data • LTE: control Not for low-power networks

  5. Outline • Background and motivation • Approach • System design • Evaluation • Conclusion

  6. Low-Power Wide Area Networks • Kilometers communication range • One-hop control plane • Good manageability • LoRaWAN • License-free ISM band • Open data link standard • Unmanaged network Control plane Data plane

  7. LoRaWAN Characteristics Class-A Characteristics • Uplink-downlink asymmetry • Concurrent uplinks • Non-concurrent downlinks • Session initiated by end node • ALOHA MAC • Unacceptable collisions for control messages X SF7 SF8 SF11 SF7 SF10 SF9

  8. Outline • Background and motivation • Approach • System design • Evaluation • Conclusion

  9. Energy Profiling • LoRaWAN ≈ 2.94 ZigBee • Simplifies the control-plane network • Light control plane’s traffic

  10. X TDMA • Carrier sense is not available • Communication session • t0, t1: Start and end transmission • t0’, t1’: Start and end reception • t0’: Unavailable • t1: Inaccurate • One-way time synchronization • Record t0, t1’ , Δ = t1’ - t0 • Δ depends on SF and frame size X Error 2.9 ms

  11. Heartbeat Time Slots Time 1 1 1 1 1 1 1 2 3 1 2 3 1 2 3 1 2 3 …

  12. Outline • Background and motivation • Approach • System design • Evaluation • Conclusion

  13. System Prototype Controller Node Software Architecture

  14. Experiment Setting • Testbed • 1 controller • 15 nodes • Application • CTP [SenSys’09]: A collection protocol, maintain a minimum-cost routing tree • Interference • Source: A laptop • Wi-Fi: Channel 6 • ZigBee: Channel 18

  15. Control Plane Performance

  16. CTP vs Ours 2.97 mW additional power consumption

  17. Conclusion • Physically separatingcontrol plane is desirable • Increase CTP’s PDR by 15% in strong interference • 2.97 mW extra power consumption per node

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