LoRa and NB-IoT, which is the pet of the Internet of Things

- Apr 10, 2019 -

LoRa and NB-IoT, which is the pet of the Internet of Things?


The LoRa module is an industrial grade RF wireless product based on Semtech's SX127X family of chips. Compared with the traditional narrow-band modulation technology, the LoRa module adopts spread-spectrum modulation technology, which has obvious advantages in suppressing the performance of co-channel interference, and solves the problem that the traditional design scheme cannot simultaneously consider the distance, anti-interference and power consumption.


NB-IoT refers to the Narrow Band-Internet of Things technology, which is a technology that operates in licensed bands. The core is for low-end IoT terminals (low-power consumption), suitable for widespread deployment in smart homes, smart cities, and smart In areas such as production, it has great advantages in long-distance, low-rate, low-power, multi-terminal IoT applications.


In terms of technical solutions, LoRa and NB-IoT each have advantages.


LoRa advantage


Compared to NB-IoT, LoRa's Sub-GHz-based frequency band makes it easier to communicate over long distances with lower power consumption, and can be powered by battery or other energy harvesting methods;


The longer wavelength of the LoRa signal determines its penetration and obstacle avoidance;

The sensitivity of the reception is greatly improved, and the receiving sensitivity exceeding -148dBm makes the visual communication distance up to 15 kilometers;


Reduced power consumption, its receiving current is only 14mA, standby current is 1.7mA, which greatly delays the battery life;


Terminal and concentrator/gateway based systems can support ranging and positioning. LoRa's measurement of distance is based on the airborne transmission time of the signal rather than the traditional RSSI, and its positioning accuracy can reach 5m (assuming a range of 10km).


NB-IOT advantages


Wide coverage will provide improved indoor coverage. In the same frequency band, NB-IoT gains 20dB more than the existing network, and the coverage area is expanded by 100 times;


With the ability to support massive connections, NB-IoT can support 100,000 connections in one sector, supporting low latency sensitivity, ultra-low device cost, low device power consumption and optimized network architecture;


Lower power consumption, NB-IoT terminal module standby time can be up to 10 years; (if the terminal sends 200Byte messages once a day, 5 watt-hour battery life can reach 12.8 years)