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Lecture 8.1 Wireless Networks for the IoT

Lecture 8.1 Wireless Networks for the IoT. CMSC 818W : Spring 2019. Tu-Th 2:00-3:15pm CSI 2118. Nirupam Roy. Apr. 16 th 2019. What we’ve learned so far…. IoT. Sensing. Computing. Communication. AM, FM, PM, CDMA, TDMA, FDMA, OFDM,

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Lecture 8.1 Wireless Networks for the IoT

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  1. Lecture 8.1 Wireless Networks for the IoT CMSC 818W : Spring 2019 Tu-Th 2:00-3:15pm CSI 2118 Nirupam Roy Apr. 16th 2019

  2. What we’ve learned so far… IoT Sensing Computing Communication AM, FM, PM, CDMA, TDMA, FDMA, OFDM, Short-range, touch-based communication, wireless and acoustic communication, … Sensors (IMU, Acoustic, Camera) Sampling theory, ADC/DAC, Nyquist rate, aliasing, low-pass/high-pass filtering, Time-frequency domain, FFT, Antenna array… DSP basics, Ranging techniques(ToA, TDoA), trilateration, triangulation, gesture & motion sensing, HMM model, Localization, GPS, SLAM, Doppler, FMCW, beamforming, special filtering, security and privacy, mobileHealth … Networking

  3. Reference book

  4. Today’s talk 1. Networks 2. Wireless networks 3. Wireless sensor networks 4. Low-power wireless sensor networks

  5. Networking

  6. Networking Address: A Message to A Address: B Address: C 1 Addressing

  7. Networking Shared channel 2 Channel access protocol

  8. Networking Shared channel Carrier-Sense Multiple Access (CSMA) “Listen before you transmit” 2 Channel access protocol

  9. Networking Token Ring 2 Channel access protocol

  10. Networking Address: A Address: B 3 Routing protocol

  11. Networking Wired vs. Wireless Networks 3 2 1 Routing protocol Channel access protocol Addressing

  12. Today’s talk 1. Networks 2. Wireless networks 3. Wireless sensor networks 4. Low-power wireless sensor networks

  13. Wireless Networking

  14. Wireless Networking Address: B Address: A Address: C Address: D 1 Inherently multi-access

  15. Wireless Networking 1 2 3 4 Inherently multi-access Higher error-rate Limited access to power Varying topology

  16. Wireless Networking Wireless network == WiFi ? Bluetooth, ZigBee, … WiFi Cellular

  17. Wireless Networking Wired network Base station/ Access point Collision domain

  18. Wireless Networking A B

  19. Wireless Networking CSMA-CA: CSMA-Collision Avoidance A B C Hidden terminal problem

  20. Wireless Networking CSMA-CA: CSMA-Collision Avoidance RTS = Request To Send A B CTS = Clear To Send

  21. Wireless Networking CSMA-CA: CSMA-Collision Avoidance A B C RTS

  22. Wireless Networking CSMA-CA: CSMA-Collision Avoidance A B C CTS

  23. Wireless Networking CSMA-CA: CSMA-Collision Avoidance A B C RTS RTS What if the RTS packets collided?

  24. Wireless Networking CSMA-CA: CSMA-Collision Avoidance Exponential Back-off Exponential Back-off A B C RTS RTS What if the RTS packets collided?

  25. Wireless Networking D A B C Exposed terminal problem

  26. Wireless Sensor Networks Infrastructure network Mesh network Ad-hoc network

  27. Today’s talk 1. Networks 2. Wireless networks 3. Wireless sensor networks 4. Low-power wireless sensor networks

  28. Wireless Sensor Networks

  29. Wireless Sensor Networks Wireless Sensor Networks (WSN) == Wireless Ad-hoc Networks? • Large number of sensor • Densely deployed • Prone to failure • Highly dynamic topology • Limited power, computational capabilities, and memory • Nodes may not have global addresses

  30. Wireless Sensor Networks

  31. Today’s talk 1. Networks 2. Wireless networks 3. Wireless sensor networks 4. Low-power, long-range wireless sensor networks

  32. Types of Networks Personal Area Network Local Area Network Metropolitan Area Network Wide Area Network PAN LAN MAN WAN

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