Selection of NB-IOT and 4G Wireless Communication Solutions
4G, the fourth generation mobile communication technology. It is based on the continuous optimization and upgrading of 3G communication technology, integrates the advantages of 3G communication technology, and derives a series of its own inherent characteristics.
4G, the fourth generation mobile communication technology. It is based on the continuous optimization and upgrading of 3G communication technology, integrates the advantages of 3G communication technology, and derives a series of its own inherent characteristics. With WLAN technology as the development focus, it can be said that it was born for Internet access. The innovation of 4G communication technology gives it a greater competitive advantage compared with 3G communication technology. First of all, 4G communication can realize high-definition transmission of original pictures and original videos in the transmission of pictures and videos, and its transmission quality is comparable to that of computer pictures; The speed can reach up to tens of megabits per second, which is not possible with 3G communication technology, and is also a significant advantage of 4G communication technology; this fast download mode can bring us a better communication experience, and it is also convenient for our daily learning. Downloading of learning materials; at the same time, in the context of the rapid and convenient development of the network, users have also put forward higher requirements for traffic costs.
NB-IOT, mobile communication is moving from the connection of people to people, to the connection of people and things and things to things. However, the current 4G network is insufficient in the connection ability of things and things. It is in this context that NB- IOT was conceived and born. NB-IOT, commonly known as 4.5G, in addition to having a peak rate of up to 1Gbps, also means more connections based on cellular IoT, support for M2M connections, lower latency, and ultra-low power consumption. Cellular IoT is opening up a market that has never been seen before.
Electricity meter reading:
The traditional electricity meter reading requires a special person to knock on the door to check the electricity meter, which is a troublesome thing for both the power company and the user. Now all users use prepaid point cards, which saves the trouble of checking the meter, but for power companies, statistical data and real-time monitoring have become a problem, so remote power meter reading was born. Both 4G and NB can be used for remote power meter reading, but considering the small amount of power meter reading data and low requirements for data transmission rate, and combined with cost issues, it is more appropriate to use the NB solution.
The power data is collected by the substation acquisition module (meter), then sent to the substation (GPRSDTU) through the RS485/RS232 interface, and finally uploaded to the power company's server through the NB network, and then the use of electricity can be counted in real time. Happening.
River water level monitoring:
In order to ensure the smooth work of flood control, relying on current computer technology and good sensing technology, a river water level monitoring system is established to conduct unmanned remote monitoring of river water levels in real time, and transmit data to departments at all levels to achieve scientific early warning, timely flood discharge, and reduce losses. ,Improve efficiency. The next road is the structural block diagram of a typical water level monitoring system:
The amount of data collected by the river water level monitoring is not enough, but the river is generally far away from the power supply system. The river data acquisition device is generally powered by solar cells or ordinary batteries, which has certain requirements for power consumption. It is recommended to use the NB solution. Of course, if Power supply is convenient, and 4G solutions can also be used.
Bridge Inspection:
Bridge detection is to use the sensor to sense the physical quantity signal of the object to be measured, and convert the sensed signal into electrical signal output according to certain rules; then use the automatic acquisition device to collect the electrical signal of the sensor, and use the wireless data transmission module to upload the data. to the remote server for information processing, storage, display, recording, analysis and control.
When testing bridges, we often test stress, displacement, cracks, temperature and humidity, acceleration, etc. Through the detected parameters, we can understand the real-time usage of the bridge, and can respond to various abnormal situations. . Here we make a brief description of stress detection. Commonly used stress measurement sensors are: force sensors, steel stressors, bow strain sensors, resistive displacement sensors, etc. The figure below is the structure diagram of the stress detection.
Bridge detection can detect a number of physical parameters of the bridge, and can also make statistics on the vehicle flow of the bridge, and the collected data is large. Managers sometimes need to remotely configure the sensitivity of the acquisition device, etc., and need to do many flexible applications. At this time, it is recommended to use a 4G solution with higher performance.
