The rapid development of the Internet of Things puts higher demands on wireless communication technologies, LPWAN (low-power Wide-Area Network) designed for low-bandwidth, low-power, long-distance, and large-scale connected IoT applications. Wide area network) is also rapidly emerging.
IoT applications need to consider many factors, such as node cost, network cost, battery life, data transfer rate (throughput rate), latency, mobility, network coverage, and deployment type. It can be said that no technology can satisfy all IoT. demand. The NB-IoT and LoRa technologies have different technical and commercial characteristics and are the two most promising low-power WAN communication technologies. Both LPWAN technologies have the characteristics of wide coverage, multiple connections, low speed, low cost, and low power consumption. They are suitable for low-power IoT applications and are actively expanding their ecosystems.
Internet of Things communication technology
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-range communication technologies; the other is LPWAN, that is, wide-area network communication technology. LPWA can be divided into two categories: LoRa, SigFox, etc., which work on unlicensed spectrum; and 2/3/4G cellular communication technologies, such as EC-GSM, which are supported by 3GPP and operate under licensed spectrum. LTE Cat-m, NB-IoT, etc.
LoRa and NB-IoT are both low-power wide-area Internet of Things technologies, and are currently the two mainstream technology schools in China.
NB-IoT, LoRa brief
LoRa (Long Range) is a kind of ultra-long-range wireless transmission scheme based on spread spectrum technology adopted and promoted by Semtech in the United States. This solution changes the previous compromise between transmission distance and power consumption, and provides users with a kind of compromise. Simple to achieve long-distance, low-power, high-capacity systems, and thus expand the sensor network. The LoRa network is mainly composed of a terminal (with built-in LoRa module), a gateway (or base station), a server, and a cloud. The application data can be transmitted in both directions.
NB-IoT (Narrow Band-Internet of Things) is a technical standard defined by the 3GPP standardization organization. It is a narrow-band RF technology designed for the Internet of Things and widely used worldwide. With the license band, you can use three deployment modes: in-band, guard band, or independent carrier to coexist with the existing network.
NB-IoT, LoRa use frequency band
NB-IoT uses licensed bands and is available in three deployments: standalone deployment, protection band deployment, and in-band deployment. The world's mainstream frequency bands are 800MHz and 900MHz. China Telecom will deploy NB-IoT in the 800MHz band, while China Unicom will choose 900MHz to deploy NB-IoT. China Mobile may re-plant the existing 900MHz band.
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