Multi-channel concurrent downlink IoT lora base station

Abstract

The invention discloses a multi-channel concurrent downlink IoT LoRa base station, comprising a LoRa wireless data transmission unit, a CPU core processing unit, an MCU core processing unit, an Ethernet data transmission unit and a GPS positioning unit; the LoRa wireless data transmission unit is provided with Multiple uplink channels and multiple downlink channels, the LoRa wireless data transmission unit is connected to the CPU core processing unit, the CPU core processing unit is connected to the GPS positioning unit, the CPU core processing unit is connected to the MCU core processing unit, and the MCU core processing unit is connected to the LoRa wireless Data transmission unit connection, the invention not only realizes full-duplex communication, but also realizes two-way symmetrical 8+8 channels, and adds two downlink channels, which can realize two-way peer-to-peer communication, reduce packet loss, reliable communication, and reduce retransmission , Timely network disconnection judgment, and finally achieve the ability of wide-area coverage, and achieve city-level coverage.

Description

technical field [0001] The invention relates to a wireless communication base station, in particular to a multi-channel concurrent downlink LoRa base station of the Internet of Things. Background technique [0002] In the field of low power wide area network (LPWAN) applications, LoRa is one of the hottest technologies. With the demand for low-power long-distance connection of the Internet of Things, LoRa has completely changed the field of embedded wireless communication with its openness and flexibility. LoRa technology integrates digital spread spectrum, digital signal processing and forward error correction coding technology, realizes long-distance transmission with low power consumption, changes the balance between transmission power consumption and transmission distance, in battery-powered In wireless communication scenarios, using LoRa for data transmission has obvious advantages. It presents a new communication technology that can achieve long distance, long battery...

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used LoRa base stations (gateways or concentrators) are basically half-duplex base stations with 8+1 channels. From the perspective of the number of channels, the uplink and downlink are seriously asymmetrical. From the perspective of working mode, they are all half-duplex. Industrial communication, that is, when the base station sends data downlink, it cannot receive the uplink data packet of the terminal. The longer the time for downlinking one packet of data, the greater the possibility of packet loss. Taking SF12 as an example to send a 64-byte downlink packet, the sending time Up to 2.8 seconds, very prone to packet loss

With an asymmetric channel, the terminal cannot receive a response when sending, and cannot timely perceive whether the data packet is successfully transmitted. The entire communication link is open-loop, and the communication is extremely unreliable.

In the Internet of Things, the frequency of terminal packet sending itself is low. If one data packet is lost, it means that there is no data for one day or even longer. If the network is abnormal or the server is restarted, subsequent packet verification errors will occur. According to the LoRaWAN specification , it may be half a month or even longer without knowing that the network is disconnected, resulting in the failure of follow-up business based on this data, so the whole system is unreliable and incomplete

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