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• IoT LPWA communication network technology (1): NB-IOT communication development characteristics and main application through sce

01 What is NB-iot?

To understand nb-iot, we first need to understand what is low power wide area network (lpwan), that is, the so-called low power wide area network (lpwan), which is different from the 3-4-5g long distance communication network we are familiar with, it is a long distance It is a long-range low-power wireless communication lpwa standardnetwork technology, mainly including nb-iot, lora, sigfox, emtc 4, nb-iot, lora, etc., which has been attracting market attention and pursuing in recent years, especially nb-iot.

We all know that IoT is the interconnection of all things. With the birth of our 6th Internet Protocol (IPv6), supporting 2 ^ 128 network addresses means that 4.3 x 10 ^ 20 network addresses can be assigned per square inch on the planet, which clears the way for every IoT device, especially sensors, to be assigned a network address.

The future development of each device can be based on the student's own network address to achieve "Internet access", "communication" with other devices, our daily contact with 3-4-5G, mainly for human-to-human network information communication; and LPWAN existence The significance of the existence of LPWAN is that we teachers can understand that, for the communication between the device system to play a good communication service network economic foundation, and for this teaching communication data technology research has the characteristics of China's network coverage, low power consumption of the terminal analysis is more suitable for large-scale deployment of IoT applications.

Say LPWAN, start to introduce the main characters NB-IOT.

Nb-iot or narrowband IOT is a low-cost cellular network that can be deployed directly on gsm, umts or lte networks. It can run over a dozen kilometers and can support up to 50,000 connections and a thousand device terminals per network cell.

In terms of speed, the frequency network bandwidth of NB-IoT is 200 kHz. transmission rates are typically between 160 kbps and 250 kbps; NB-IoT communication often has a 10s transmission delay due to the communication structure of NB-IOT and the setting of the data reception and upload mode of the device itself.

02 NB-IoT networking technology communication and working life style?

NB-IoT communication usually includes the following components.

Nb-iot communication module: nb-iot communication module and related devices can have nb-iot communication capability;

Power module: Power is required to operate the device. Businesses with high time requirements need continuous wired power supply, such as smart street lights; for business scenarios with low latency requirements, button batteries or common No. 5 batteries at home, such as NB-IoT water meters with batteries buried underground, will be used for 3-5 years.

IoT card: a traffic card used to give equipment for Internet access, used to produce equipment information communication, which can correspond to the understanding that people need to open traffic packages through Internet access enterprises.

NB-IoT communication base station: the information obtained by NB-IoT devices needs to be sent to a special NB-IoT base station, which does not support ad hoc network mode, and currently the three major domestic operators and even Huawei and other manufacturers are actively deploying NB-IoT base stations. More than a dozen foreign operators such as Vodafone, Deutsche Telekom and Softbank Japan are also involved in the construction of NB-IoT base station networks.

Subscriber server: The base station receives data from the device and sends it to the corresponding subscriber server. The data is managed and displayed in the corresponding PC and mobile applications.