[01] Yanhui Ji, School of Information Engineering, Yancheng Teachers University, Yancheng, China. [02] Hao Yang, Jiangsu Provincial Key Constructive Laboratory for Big Data of Psychology and Cognitive Science, Yancheng Teachers University, Yancheng, China.

There are many wireless communication technologies in the Internet of Things, which are mainly divided into two categories: one is Zigbee, WiFi, Bluetooth, Z-wave and other short-distance communication technologies; the other is LPWAN (low-power Wide-Area Network), namely WAN communication technology. LPWA can be divided into two categories: one is the technology of LoRa and SigFox working in unauthorized spectrum; the other is the technology of 2/3/4 G cellular communication supported by 3GPP working in authorized spectrum, such as EC-GSM, LTE Cat-m, NB-IoT. LoRa works in an unauthorized frequency band below 1GHz, so there is no additional charge for its application. It uses free unauthorized frequency bands and is an asynchronous communication protocol, which is the best choice for battery power supply and low cost. NB-IoT has become an important branch of the Internet of Things. NB-IoT is built in cellular network and needs a narrow bandwidth about 180 KHz, which can be directly deployed in GSM network, UMTS network or LTE network to reduce deployment cost and achieve smooth upgrade. From the point of view of NB-IoT and LoRa chip products, many products are integrated with MCU or processor, which makes signal and data processing and communication protocol management more convenient. Both NB-IoT and LoRa are still at the initial stage of development, requiring input from all parties and common development.

IoT, LoRa, NB-IoT

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