_{LoRa Introduction}

LoRa Introduction

LoRa is a wireless low-power LAN standard developed based on the wireless spread spectrum technology LongRang of Semtech. Its purpose is to solve the contradiction between the power consumption of battery powered equipment and the transmission distance that is difficult to cover. In general, in the FSK debugging mode, the lower the transmission power, the closer the transmission distance is, and the higher the transmission power, the longer the transmission distance is. By developing LoRa spread spectrum technology, the technical problem that the transmission distance is longer than other wireless modulation methods under the same transmission power condition is solved, and the unity of low power consumption and long distance is realized.

LoRa is actually a wireless platform for the Internet of Things (IoT). Semtech's LoRa chipset (SX1272, SX1262, SX1276) connects battery powered sensors to the cloud to enable instant communication of data transmission and analysis, thereby improving communication efficiency and productivity.

Description

The invention relates to a spread spectrum transmission technology of the Internet of Things access layer network.

Application

The LoRaWAN open specification is based on the low power consumption wide area network (LPWAN) standard of the LoRa equipment of Semtech Company. It uses the free frequency bands of industry, science and medicine (ISM, 433M, 868M, 915Mhz), and does not require a license. LoRa Alliance (a non-profit association and a rapidly growing technology alliance) has promoted the standardization and global coordination of LoRaWAN standards.

LoRaWAN standards provide efficient, flexible and economical solutions for practical problems in rural and indoor use. In these cases, cellular, Wi Fi and Bluetooth low-power (BLE) networks cannot provide LoRaWAN communication distance and networking.

LoRa devices and LoRaWAN standards provide compelling features for IoT applications, including remote, low-power, and secure data transmission. This technology is used by public, private or hybrid networks and provides a wider range than cellular networks. LoRa deployment can be easily integrated into existing infrastructure and support low-cost battery powered IoT applications. LoRa chipsets are integrated into devices manufactured by large IoT solution provider ecosystems and connected to global networks. Simply put, LoRa connects devices to the cloud to provide "sound" for things - making the world a better place to live, work and play.

Composition of LoRa network

LoRa network generally consists of terminal equipment, gateway equipment, network server and application server.

The terminal equipment is generally a small module or a terminal equipment with embedded modules. The transmission distance of such equipment can reach several kilometers, such as water and electricity meters, smoke alarms, pet trackers, logistics locators, etc.

Gateway devices are generally used to receive data sent by terminal devices and send them together. Therefore, they are usually called LoRa concentrators. When data is collected together, they are usually sent together. According to the network sending data, they can be divided into LoRa Ethernet gateway and LoRa-4G gateway.

The network server is generally a server built on the cloud, which is used to process the parameters uploaded by LoRa gateway and nodes, and belongs to the device server.

The application server is a client oriented server that converts data and provides it to users.