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SophiaConf 2018 - N. Tribie (SEQUANS)

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Support de présentation : Introduction to NB IoT

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SophiaConf 2018 - N. Tribie (SEQUANS)

  1. 1. Introduction to NB IoT Nicolas Tribie – ntribie@sequans.com Copyright © 2018 Sequans Communications MKT-FM-016-R01
  2. 2. LTE (4G) for IoT Usage Copyright © 2018 Sequans Communications2 Nokia 3GPP
  3. 3. NB IoT versus LoRaWAN 3 Licensed Spectrum  Users need to register with an operator.  Guaranteed QoS Reuses existing 4G base stations network  NB IoT support : By software upgrade,  Network is costly , but shared with 4G usage  Natural replacement for GPRS M2M Higher power consumption  Protocol overhead (QoS) Unlicensed Spectrum  Private networks are possible  Also deployed by operators  Spectrum shared with other devices New network deployment required  But Low cost base stations. Lower power consumption  Small protocol overhead NB IoT LoRaWAN Similar Data Throughput Similar coverage performance
  4. 4. NB IoT Performance 4 50 000 to 800 000 devices per base station (eNB) ~ 10 new connexions / second per base station < 10 s latency Coverage :  ~1.5 km urban (Need to reach basement water/electricity meters )  20 km free range  3x GSM / legacy LTE ( 164 dB MCL) 10+ years battery life  200 Bytes upload, 20 bytes download / day / 5WH battery Coverage (km) . 3GPP
  5. 5. LTE Signal: OFDM Modulation 5 5 to 20 MHz BW for LTE Sound Analogy: Multiples notes of a piano chord  Message = intensity of a single note + notes sequence Light Analogy: White light decomposition in a rainbow  Message = intensity of each monochromatic source + sequence Usages: LTE, WiFi, DVB-T (digital TV) , ADSL , PowerLine, ..
  6. 6. LTE signal structure Copyright © 2015 Sequans Communications6 P-SCH - Primary Synchronization Channel S-SCH - Secondary Synchronization Channel PBCH - Physical Broadcast Channel PDCCH - Physical Downlink Control Channel PDSCH – Physical Downlink Shared Channel Reference Signal – (Pilot) 64QAM16QAM QPSK Frequency Time Agilent
  7. 7. OFDMA : Spectrum Sharing Between Users 7 Agilent
  8. 8. NB IoT in the LTE signal 8 One Physical resource Block (PRB) is assigned to NB IoT traffic : 12 subcarriers NB IoT devices will only listen to this tiny 180 KHz bandwidth  Simpler Radio , lower power  Only 1 % of the total LTE bandwidth NB IoT Frequency Time Agilent
  9. 9. In Real Life : LTE Spectrum 9 Frequency Time Signal from an Enode-B (base station) , seen from a spectrum analyzer NB IoT
  10. 10. Messaging sequence • Wake up • Synchronize with Network • Get Network Info • Request Access • Setup session • Data exchange • Close Session • Re-enter deep sleep 3GPP
  11. 11. NB ioT vs LTE Coverage enhancements 11 LTE signal originally designed for :  High Data throughput (> 100 Mbps) , fair reception conditions  Fairly complex receiver (costly)  “High” power consumption (mobile battery : 8 WH) NB IoT is targeted for :  Low cost and Low Power Devices,  Low data throughput , bad reception conditions Solution : Transmission repetitions:  Simpler coding : “simpler” receiver,  Signal is compatible with LTE freq/time grid  Signal / Noise is improved across repetitions  Throughput / coverage tradeoff tailored to each case :  -100 dBm (fair RX conditions) : 1 repetitions : ~ 56 Kbps  -144 dBm (worst RX condition) :256 repetitions : ~ 400 bps Analogy with Astronomy Photography (faint Galaxy image acquisition)
  12. 12. Energy savings Enhancements Copyright © 2015 Sequans Communications12 Concept : stay idle as long as possible  A periodic RendezVous is negotiated with the base station :  Base station keeps the device registered  Device remembers network parameters  Shorter attach time  Device goes into sleep mode,  Device wakes up quickly at each RDV:  Data exchange happens  QoS : NBioT claims less energy spent per message than LoRaWAN Device can request uplink at anytime  Example : sensor alert 3GPP
  13. 13. Sequans NB IoT Platform 13 • Hardware : Paris • RF : Reading (UK) / Kista (SW) • SW / DSP : Sophia/ Paris Pycom “FiPy”module for Makers WiFi/BT CatM NB-IoT Sequans Monarch Platform PyCom Sequans
  14. 14. Towards 5G.. 14 Source: ITU Cat-M and NB-IoT fulfill 5G mMTC requirements: mMTC : Massive Machine Type Communications MultiCast capability added Even more power savings features
  15. 15. 15 Thank You ! References :  www.sharetechnote.com/html/Handbook_LTE.html  Book: Cellular Internet of Things:  Slideshare: Tdd lte training material  3GPP: www.3gpp.org
  16. 16. Annex 1 :NB IoT Frame 16 Time view User control User Data
  17. 17. Annex 2.1 : Energy consumption Lora / NB IoT 17 Actility
  18. 18. Annex 2.2: Energy Timeline 18
  19. 19. Annex 3 :Link Budget details 19
  20. 20. Annex 4 : Throughput 20

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