Four characteristics of nb-iot

          Read about NB-IOT Everyone knows ,NB-IOT It has the following characteristics . One is ultra-low power consumption , Second, the cost is low , Third, strong coverage , Fourth, there is a large amount of connection , It is estimated that some people do not understand the concept of these characteristics , Then the editor of Anchuan IOT will explain it to you this time NB-IOT Four characteristics of

　　

　　 One 、 Ultra-low power consumption

　　 Communication and mobile platforms between IOT devices and PC The ends are different , General wisdom between IOT devices generates uplink packets to send , But whether to send data packets is decided by the device itself , Sleep when you don't need it , Then wait for other terminals to call wake up , For small bags ,NB-IOT And designed PSM and sDRX Two unique power saving modes to deal with , So as to achieve the role of ultra-low power consumption

　　

　　 Two 、 The cost is low

　　NB-IOT It has a relatively low cost ,NB-IOT Simplify signaling processing , And greatly reduce the chip price ,NB-IOT It can be based on... Provided by Huawei Single RAN Solution , Support network upgrading in existing equipment manufacturers , So as to reduce the maintenance cost and construction cost , and NB-IOT Our chips are specially designed for the physical network , Only for low rate 、 Narrow band IOT demand

　　

　　 3、 ... and 、 Strong coverage

　　 In understanding NB-IOT After the feature of low cost , Let's talk about it again NB-IOT Covering force , For the deployment characteristics of physical network , At present, the access technology of the manufacturer cannot meet the requirements of deep coverage , and NB-IOT It is specially designed for the Internet of things , Through time domain retransmission technology and improving power spectral density , by comparison GSM also LTE Online MCL with 20dB The gain of , For example, the following

　　

　　MCL（Max Couping Loss） Maximum coupling loss - The maximum coupling loss can measure the coverage , As long as the value is large , The larger the coverage , commonly LTE Of MCL by 142.7.GSM Of MCL by 144, and NB-IOT Of MCL You can achieve 164, And this 20dB The gain of can make NB-IOT Than GSM Two more walls , The gain of this part is achieved by increasing the power spectral density and repetition

　　

　　NB-IOT after 15kHz To transmit data , Comparative use 180kHz Bandwidth for transmission can be improved 11dB The gain of , Import the encoding method of repeated sending , Improve the transmission reliability in case of bad channel conditions through repeated transmission , Can improve 12dB The uplink gain of 9dB Downlink gain

　　

　　 such , It only needs fewer sites to cover a larger area , meanwhile NB-IOT More penetrating , It can even penetrate 3 The first floor of cement reaches the basement and other places that cannot be reached by the general network , In this way, it can be used in some areas where the general network cannot penetrate , Such as parking garage , Under the water pipe and other places

　　

　　 Four 、 Large connection

　　NB-IOT It is specially designed for the Internet of things , The transmission mode of physical network is different from that of mobile phone , There are many device terminals between the Internet of things , But the packets sent between each terminal are very small , The data sent does not require much delay , Based on the above two points ,NB-IOT etc. LPWAN You can achieve multi terminal links, so as to achieve the effect of networking products