DORM: an integrateD cOmpact naRrowband platforM for NB-IoT
As part of our ongoing research efforts on NB-IoT, our group has built and deployed a test platform comprising 50 NB-IoT (DORM) nodes, a commercial base-station from Telia Eesti, and a cloud backend server, as shown in Figure 1.
The two versions of our DORM nodes are shown in Figure 2. They combine ultra-low-power STM32-based Nucleo boards (L476RG (Cortex M4) or L073RZ (Cortex M0+)) with Quectel BG96 chipset-based boards (Avnet Silica NB-IoT shield  or Quectel GSM/NB-IoT EVB Kit) and are powered by an external 20000 mAh BP15 BLOW battery. The STM32-based Nucleo boards are used as the processing units as they are highly affordable and can be extended with a large number of hardware add-ons to seamlessly work with a wide range of sensors. The Quectel BG96 radio chipset features ultra-low power consumption and supports LTE Cat NB1 (i.e. 3GPP Release 13 NB-IoT) along with a set of industry-standard interfaces (such as USB/UART/I2C/Status Indicator) suitable for a wide range of IoT applications.
Examples of results
Full details of the results shown below can be found in:
- 2019: "DORM: Narrowband IoT Development Platform and Indoor Deployment Coverage Analysis", SZ Khan, H Malik, J Leonel Redondo Sarmiento, MM Alam, Y Le Moullec, International Workshop on Recent Advances in Cellular Technologies and 5G (RACT-5G-IoT 2019)
- 2019: 2019: "NB-IoT Network Field Trial: Indoor, Outdoor and Underground Coverage Campaign", Hassan Malik, Sikandar Zulqarnain Khan, Jeffrey Leonel Redondo Sarmiento, Alar Kuusik, Muhammad Mahtab Alam, Sven Le Moullec, Yannick, Parand, The 15th IEEE International Wireless Communications & Mobile Computing Conference (IWCMC 2019)
Figure 3. Coverage of NB-IoT for outdoor scenario in terms of RSSI
Figure 4. Coverage of NB-IoT for indoor scenario in terms of RSSI
Figure 5. Temporal link dynamic of Device 4 in an indoor scenario for 6 hours in the morning and evening, respectively, in terms of RSSI
Figure 6. Coverage of NB-IoT for underground scenario in terms of RSSI