The application of Lora and lorawan wireless technology in the Internet of things

Lora The alliance says ：“Lora Equipment and open LoRaWAN The protocol enables intelligent Internet of things applications to solve some of the biggest challenges facing our smart city construction ： energy management 、 Natural resources decrease 、 Pollution control 、 Infrastructure efficiency 、 Disaster prevention, etc .”

LoRaWAN What is the purpose of ？

LoRaWAN It has multiple uses and functions in the deployment of the Internet of things and smart cities .LoRaWAN Optimized for low power consumption , It aims to expand from a single gateway installation to a large global network with billions of devices . Specifically, it includes support “ Redundant operations 、 Location 、 Low cost 、 low power consumption ”. meanwhile LoRaWAN The device can also use energy collection technology .

1.LoRaWAN Classic applications in the Internet of things or smart city include remote meter reading 、 Public safety 、 Position location 、 Leak proof test 、 Disaster prevention 、 Environmental monitoring 、 Smart energy 、 Agriculture, etc .

2.LoRaWAN technology It can also enable cities to effectively connect their assets , Make the most of it , To provide better service , Including waste management 、 Parking 、 Street lights and public safety .

LoRaWAN and Lora Application of wireless technology in smart cities

Smart cities have been used Lora and LoRaWAN. Use... In the city LoRaWAN The antenna , The maximum distance can reach 7 km ( For packet transmission , The distance may be 10 km ). The bandwidth is very low , So it does support applications such as video , But it is very suitable for covering a wide range of areas , Without having to deploy hundreds of access points . About seven access points will cover the whole city , Can detect any type of and Lora Compatible sensors .

Firefighters in the city asked to monitor the gas leakage on the nearby railway tracks . Cover the forest 52 Square miles Wi-Fi Mesh networks are impractical , therefore LoRaWAN The solution comes in handy , The solution connects to a radius close to 3 Miles and less electrode consumption , So sensors and batteries can be used for three to four years .

LORA What is the maximum coverage of the network ？

Semtech Express ,Lora Can be connected 30 miles (48.3 km ) Equipment in rural areas outside , Even between cities with very high spatial density or in the deep indoor environment , It can also work well . In many countries LoRaWAN During transmission , Many factors determine the connection range , For example, the type of antenna indoor / Outdoor gateway 、 Message payload, etc . On average, , In the urban environment with outdoor gateway , Most of the LoRaWAN The transmission coverage can reach 2 To 3 km , And in rural areas , It can achieve 5 To 7 km .

LORA Online Terminal equipment What are they? ？

LORA The terminal node can be various devices , Such as water meter 、 Gas meter 、 smoke detector 、 Pet tracker, etc , utilize LORA Wireless communication technology will these ji'e Connect points to LORA gateway , recycling 3G Network or Ethernet connection to network server . The communication between gateway and network server is based on TCP/IP agreement .

3 Kind of LORA The network will connect terminal devices ：

A class ： This kind of terminal equipment is a two-way communication terminal equipment . Each terminal device's uplink transmission will be accompanied by two downlink receiving windows . Based on its own communication needs , The transmission fine adjustment of the terminal device is based on ALOHA agreement .

B class ： Preset the bidirectional of the receiving slot Communication terminal equipment . This type of terminal device will open the redundant receiving window within the preset time . To achieve this , The terminal device will synchronously receive the beacon from the gateway , And synchronize the time of the base station and the module through the beacon .

C class ： Two way communication terminal equipment with the largest receiving window . This type of terminal device continues to open the receiving window , And turn it off only during transmission .