Foreword:
Since April 1, 2018, China Unicom will no longer support 2G networks for new Unicom cards, and completely shut down all Unicom users' 2G networks in 2019. In other words, soon Unicom cards can only use 3G and above networks. In 2001, 2G networks were formally established. Today, more than a decade later, 2G is finally leaving the stage of history.
It is expected that the construction of 5G base stations will be completed in 2019, and the mobile and telecommunication 2G networks will also be withdrawn from the stage. IoT remote data transmission will also be upgraded with 4G or NB-IOT upgrade from GPRS.
So, is NB-iot good or 4G good? These two kinds have their own strengths. One is good flexibility, and the other is low power consumption and low cost.
4G advantages:
Fast communication
The 4G network has both TD-LTE and LTE FDD formats. The FDD network theory has a peak value
150Mbps, TD network theoretical peak up to 100Mbps, this speed will be equivalent to the latest mobile phone transmission speed in 2009
About 10,000 times the degree, the third generation of mobile phone transmission speed 50 times.
Wide network spectrum
Each 4G channel will occupy 100 MHz of spectrum, which is equivalent to 20 times that of W-CDMA 3G network.
High quality communication
4G communication is called "multimedia mobile communication," enabling people to communicate not only anywhere, but also in both directions.
Handing data, drawings, images, etc.
NB-IOT advantages:
Wide coverage
The NB-IoT technology can achieve a coverage gain of more than 20 dB better than GSM, and the coverage area is increased by 100 times. It is in underground garages and underground pipelines.
Can also be covered.
Big connection
The NB-IoT single-sector supports 50,000 connections, which is 50 times higher than the current one (2G/3G/4G is 14/128/1200 respectively).
5 million physical sites, assuming full deployment of NB-IoT, the number of IoT terminals that can access three sites per site will reach 450 billion; narrowband technology:
Uplink equivalent power 36 channels * 23dBm, increase channel capacity to reduce air gaps; signaling overhead, improve spectrum efficiency Base station optimization: independent standards
Incoming congestion control and terminal context information storage; core network optimization: terminal context storage and downlink data cache.
Low power consumption
If the NB-IoT terminal sends 200Byte packets once per day, the standby time of the AA battery is 10 years, and the single fast transmission time is shortened.
99% of the time work in the energy saving mode (PSM). This energy saving mode is different from the energy saving mode of the mobile phone. The terminal is still registered in the network, but
Signaling is unreachable. The terminal is in deep sleep and the terminal consumes only 15 microwatts in 99% of the time. Its sleep time is longer and can be reduced
The frequency at which the terminal monitors the network.
low cost
Compared to 4GNB-IOT module prices are lower
The flexibility of 4G is that data transmission is through the transmission of traffic, and NB-IOT is calculated based on the number of information. The 4G has a small drawback is that the cost is relatively high. And big power consumption. Therefore, we must choose according to their own circumstances. In the case of a good power supply solution, of course, 4G is better. However, low power consumption is required. It is better to hang NB-IOT.
Such as wireless smoke alarm. Since wireless is used, it is of course intended to reduce maintenance costs, so we want to have a long standby time. Naturally preferred NB-IOT. Not only does the maintenance cost decrease, the installation is also convenient. The alarm is also timely.
Want to monitor 4G flash flood is the only choice, because now NB-IOT has not covered in many mountains, so 4G can be a good competitor, 4G wireless data transmission terminal, using 7-mode communication module, 4G network is not good In case of automatic switching between GPRS or 3G, data transmission is not dropped. The final choice of 4G or NB still depends on your project.
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