Working principle of Lora to 4G and gateway repeater

What is? LoRa
LoRa Low power LAN Wireless Standard , Low power consumption is generally difficult to cover long distances , Long distance general high power consumption ,LoRa My name is long-distance radio （Long Range Radio）, Its biggest feature is that it can spread farther than other wireless modes under the same power consumption , Realize the unity of low power consumption and long distance , At the same power consumption, it is larger than the traditional wireless RF communication distance 3-5 times .

LoRa The gateway uses LoRa Wireless modulation technology to achieve long-distance data transmission gateway equipment .LoRa The gateway is located in LoRa The core position of star network , It is the information bridge between terminal and server , It's a multichannel receiver .LoRa Gateway is sometimes called LoRa Base station or LoRa Concentrator . Although the definitions are different , But in fact, the meaning is the same .

LoRa Gateways use different frequency expansion factors and different frequency expansion factors , Therefore, multiple frequency spread factors in the same channel can be demodulated theoretically . Gateway and network server pass the standard IP Connect , The terminal communicates with one or more gateways through a single hop . All terminals adopt two-way communication , Support software remote upgrade .

LoRa turn 4G The principle and use of gateway
LoRa The gateway adopts Lora Radio frequency communication technology , Distribute discrete equipment data of multiple points , Over Wireless Lora The node transmits to the gateway ,Lora Gateway through Ethernet or 4G The Internet , Transfer to server , So as to realize remote data acquisition and monitoring .Lora The gateway supports up to 100 Wireless temperature and humidity acquisition nodes , Simultaneous monitoring of multiple serial port devices , The radius of the monitoring range is up to 3Km. Support cloud platform , History query can be realized .

LoRa Relay workflow ：
　　1、 After the relay is registered and connected to the network, it performs periodic CAD testing （ cycle 1.8s）
　　2、 node Join Failure , Switch to relay mode ,JoinDelay1+1s,JoinDelay2+2s
　　3、 The node sends the band length preamble at the relay frequency point （2.1s）、IQ In reverse JoinRequest
　　4、 The relay detects a preamble and then again CAD（ interval 80ms）, If successful, wake up and start receiving node data .
　　5、 relay RX Immediately forward the data packet at the common frequency after the completion （ Normal leading 、IQ positive ） And in TXDone+JoinDelay Always receive
　　6、 The gateway sends normally at the common frequency JoinAccept（ Normal leading 、IQ reverse ）
　　7、 The relay receives from the gateway JoinAccept after , At the node RX1/RX2 Forward to the node .
　　8、 Node receives JoinAccept Send at most 5 Time MType=PROPRIETARY Of packets to the repeater , The content contains a logo （0x1A2B3C4D）,DevEui and DevAddr
　　9、 After receiving the repeater, it will be in Rx1 Send the same packet to the node , The node stops sending after receiving , Otherwise, enter again after the number of sending reaches the maximum Join technological process .
　   10、 Communication process and Join The process is basically the same , Node relay mode RXDelay+1s,RX2Delay+2s. After the communication is completed, there is no need to interact with the white list of customized packages .

 

     DLS11 Is for VS The built-in battery and LoRA、LTE（4G） Wireless low-power data forwarder . utilize “ Real time online ” Of LoRA The transceiver collects other LoRA The data sent by the device is stored , Regularly start to repackage these stored data into standard packets via LTE Network send to remote server , Data sending methods include SMS 、TCP、 mail 、FTP etc. .DLS11 real Now VS Field networking of vibrating wire acquisition equipment , Use a SIM Card can realize multiple sets VS The data remote transmission function of vibrating string acquisition instrument .

It is widely used in greenhouse planting 、 The breeding industry 、 workshop 、 Traffic 、 The mine , Geotechnical engineering , Smart agriculture , Smart street and other industries .