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Evaluation of LoRa LPWAN Technology for Indoor Remote Health and Wellbeing Monitoring

  • Juha Petäjäjärvi
  • Konstantin Mikhaylov
  • Rumana Yasmin
  • Matti Hämäläinen
  • Jari Iinatti
Article

Abstract

Long lifetime of a wireless sensor/actuator node, low transceiver chip cost and large coverage area are the main characteristics of the low power wide area network (LPWAN) technologies. These targets correlate well with the requirements imposed by the health and wellbeing applications of the digital age. Therefore, LPWANs can found their niche among traditional short range technologies for wireless body area networks, such as ZigBee, Bluetooth and ultra wideband. To check this hypothesis, in this work we investigate the indoor performance with one of the LPWAN technologies, named LoRa, by the means of empirical measurements. The measurements were conducted using the commercially available devices in the main campus of the University of Oulu, Finland. In order to obtain the comprehensive picture, the experiments were executed for the sensor nodes operating with various physical layer settings, i.e., using the different spreading factors, bandwidths and transmit powers. The obtained results indicate that with the largest spreading factor of 12 and 14 dBm transmit power, the whole campus area (570 m North to South and over 320 m East to West) can be covered by a single base station. The average measured packet success delivery ratio for this case was 96.7%, even with no acknowledgements and retransmissions used. The campus was covered also with lower spreading factors with 2 dBm transmit power, but considerably more packets were lost. For example with spreading factor 8, 13.1% of the transmitted packets were lost. Aside of this, we have investigated the power consumption of the LoRa compliant transceiver with different physical layer settings. The experiments conducted using the specially designed module show that based on the settings used, the amount of energy for sending the same amount of data may differ up to 200-fold. This calls for efficient selection of the communication mode to be used by the energy restricted devices and emphasizes the importance of enabling adaptive data rate control.

Keywords

IoT Chirp spread spectrum Spreading factor RSSI Coverage Range Power consumption 

Notes

Acknowledgements

The authors wish to thank Marko Pettissalo from Nokia for providing the commercial LoRa sensor node and the base station used in this study. This work has been partially funded by the Finnish Funding Agency for Innovation (Tekes) through VIRPA C Project.

References

  1. 1.
    N. Hunn: LoRa vs LTE-M vs Sigfox. Available online: http://www.nickhunn.com/lora-vs-lte-m-vs-sigfox/.
  2. 2.
    S. Movassaghi, M. Abolhasan, J. Lipman, D. Smith, A, Jamalipour: Wireless Body Area Networks: A Survey. IEEE Comm. Surveys & Tutorials, vol. 16(3), (2014).Google Scholar
  3. 3.
    J. Petäjäjärvi, K. Mikhaylov, R. Vuohtoniemi, H. Karvonen, J. Iinatti: On the Human Body Communications: Wake-up Receiver Design and Channel Characterization. EURASIP Journal on Wireless Comm. and Netw., 2016:179, (2016).Google Scholar
  4. 4.
    E. Kartsakli, A. Lalos, A. Antonopoulos, S. Tennina, M. Di Renzo, L. Alonso, C. Verikoukis: A survey on M2M systems for mHealth: A wireless communications perspective. Sensors, vol. 14, pp. 18009–18052, (2014).Google Scholar
  5. 5.
    S. Ullah, H. Higgins, B. Braem, B. Latre, C. Blondia, I. Moerman, S. Saleem, Z. Rahman, K. Kwak: A comprehensive survey of wireless body area networks – On PHY, MAC, and Network Layers Solutions. Journal of Med. Syst., vol. 36, pp. 1065–1094, (2012).Google Scholar
  6. 6.
    R. Sanches-Iborra, M. D. Cano: State of the Art in LP-WAN Solutions for Industrial IoT Services. Sensors 16(5):708, (2016).Google Scholar
  7. 7.
    A. Augustin, J. Yi, T. Clausen, M. Townsley: A Study of LoRa: Long Range & Low Power Networks for the Internet of Things. Sensors 16(19):1466, (2016).Google Scholar
  8. 8.
    C. Goursaud, J. M. Gorce: Dedicated Networks for IoT: PHY/MAC State of the Art and Challenges. EAI Endorsed Trans. on Internet of Things (2015).Google Scholar
  9. 9.
    K. Mikhaylov, J. Petäjäjärvi, T. Hänninen: Analysis of the Capacity and Scalability of the LoRa Wide Area Network Technology. In: European Wireless Conf., Oulu, Finland, 18–20 May (2016).Google Scholar
  10. 10.
    J. Petäjäjärvi, M. Pettissalo, K. Mikhaylov, A. Roivainen, T. Hänninen: On the coverage of LPWANs: Range Evaluation and Channel Attenuation Model for LoRa Technology, In: ITS Telecommunications, Copenhagen, Denmark, 2–4 Dec. (2015).Google Scholar
  11. 11.
    J. Petäjäjärvi, K. Mikhaylov, M. Pettissalo, J. Janhunen, J. Iinatti: Performance of a LPWAN based on LoRa Technology: Doppler Robustness, Scalability and Coverage. Conditionally accepted to DWSN.Google Scholar
  12. 12.
    J. Petäjäjärvi, K. Mikhaylov, M. Hämäläinen, J. Iinatti: Evaluation of LoRa LPWAN Technology for Remote Health and Wellbeing Monitoring. In: ISMICT, Worcester, MA, USA, 21–23 Mar. (2016).Google Scholar
  13. 13.
    LoRa Alliance: LoRaWAN Specification v.1.0. Jan. (2015).Google Scholar
  14. 14.
    Semtech: LoRa modulation basics – AN1200.13, Revision 1., Jan. (2015).Google Scholar
  15. 15.
    T. S. Rappaport: Wireless Communications – Principles and Practices. (IEEE Press, New Jersey, 1996).Google Scholar
  16. 16.
    Semtech: SX1272/73 – 860 MHz to 1020 MHz Low Power Long Range Transceiver. Datasheet, revision 3, Mar. (2015).Google Scholar
  17. 17.
    Semtech: SX1272/3/6/7/8 LoRa Modem Design Guide – AN1200.13, Revision 1, July (2013).Google Scholar
  18. 18.
    A. S. Tanenbaum. Computer Networks: The Medium Access Sublayer, 3rd edn., (Prentice-Hall, New Jersey, 1996), pp. 243–338.Google Scholar
  19. 19.
    LoRa Alliance: A Technical Overview of LoRa and LoRaWAN, White paper, Nov. (2015).Google Scholar
  20. 20.
    Semtech: LoRaMote, Revision 2.0, July (2014).Google Scholar
  21. 21.
    Finnish Communications Regulatory Authority: 15AH/2015M – Regulation on Collective Frequencies for License-exempt Radio Transmitters and on Their Use. Feb. (2015).Google Scholar
  22. 22.
    Aerial: Biconical Antenna D100-1000.Google Scholar
  23. 23.
    K. Mikhaylov, J. Petäjäjärvi, M. Mäkeläinen, A. Paatelma, T. Hänninen: Demo - Modular Multi-radio Wireless Sensor Platform for IoT Trials with Plug&Play Module Connection. In: MobiCom, pp. 188-189, Sept. 7–12 (2015).Google Scholar
  24. 24.
    K. Mikhaylov, J. Petäjäjärvi, M. Mäkeläinen, A. Paatelma, T. Hänninen: Extensible Modular Wireless Sensor and Actuator Network and IoT Platform with Plug&Play Module Connection. In: IPSN, pp. 386-387, Apr. 13–16 (2015).Google Scholar

Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  1. 1.Centre for Wireless CommunicationsUniversity of OuluOuluFinland
  2. 2.University of OuluOuluFinland

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