LPWA, NB-IoT and LTE-M network functionalities
LPWA connectivities possess three specific features that confer performance and autonomy while enhancing their energy efficiency. These features are applied at the module level of the device.
- Extended Coverage (EC): This feature allows the device to capture the radio signal in areas where a mobile phone would detect no signal. The extended coverage (EC) function is a real advantage in hard-to-reach areas, for example inside HQE (High Environmental Quality) buildings, to connect to the network and transmit information to your server.
Use case example: The “Extended Coverage (EC)” feature, for example, facilitates the management of parking lots and underground networks. Similarly, it ensures connectivity of elevators, located in less accessible areas (through several walls and concrete slabs depending on the antenna position).
- Hibernation mode – Power Saving Mode (PSM): This feature allows the module to enter a state of prolonged sleep, termed hibernation, thus significantly reducing its energy consumption. Hibernate mode is triggered by a “timer” that you can set according to the needs of your use case. When hibernate mode is active, the module no longer listens to the network and cannot send or receive messages: it no longer captures real-time information.
Use case example: The PSM is perfectly suited to actions of periodic information retrieval such as water or electricity meter reading. Indeed, for these uses, communications are infrequent and do not require real-time information but at regular intervals: once every 2 hours or once a day, for example.
- Semi-awake mode – Extended Discontinuous Reception (eDRX): During the semi-awake phase (eDRX), the section of the module responsible for data reception is turned off; only data transmission from the device is possible. Also equipped with a “timer,” the radio module exits this partial sleep phase at regular intervals, allowing you to connect remotely to the device. Thus, eDRX also contributes to energy frugality.
Use case example: Fire alarms mostly operate in semi-awake mode. They communicate little but need to be able to transmit urgent information in real-time. Therefore, the rest of the time, the device saves energy.
Hibernation mode (PSM) and semi-awake mode (eDRX) thus contribute to a significant increase in the autonomy of the devices. Moreover, they can easily be combined and configured directly within the device as per each use case.
Advantages of LTE-M and NB-IoT
The most well-known LPWA networks are LTE-M and NB-IoT. Complementary to other IoT technologies, they are ideal for connecting equipment in hard-to-reach areas, at low cost and for long periods.
- High autonomy (up to 10 years)
- Cost-effective modules
- Improved performance in buried, semi-buried, and indoor areas
- Technological longevity guaranteed (compatible with the future 5G-SA expected in 2023)
➜ For more information about these technologies