Projekt LoRaWAN

Knowledge LoRa / LoRa-WAN

Einsatzmöglichkeiten

• Low Energy, low throughput, high bandwidth, long range Übertragung
• Beispiel Sensordaten
• Über LoRa-WAN auch Anbindung ans Internet, im Idealfall überall, dazu Gateways notwendig
• https://de.wikipedia.org/wiki/The_Things_Network stellt solche Gateways als Community bereit
• https://www.youtube.com/watch?v=3cIGzwH-NI8

Protokoll

LoRaWAN Klassen (ausLoRaWAN Backend Interfaces 1.0 Specification)

• Layer 1 - Chirp Spread Spectrum
  • https://de.wikipedia.org/wiki/Chirp_Spread_Spectrum
  • In Europa Frequenzen 433 MHz (ISM-Band Region 1) und 868 MHz (SRD-Band Europa)
  • Reichweiten von 2 km (Stadtgebiet) über 15 km (Vororte) bis zu 40 km (ländliche Gebiete)

• Layer 2

• • Bi-directional end-devices (Class A): End-devices of Class A allow for biirectional communications whereby each end-device’s uplink transmission is followed by two short downlink receive windows. The transmission slot scheduled by the end-device is based on its own communication needs with a small variation based on a random time basis (ALOHA-type of protocol). This Class A operation is the lowest power end-device system for applications that only require downlink communication from the server shortly after the end-device has sent an uplink transmission. Downlink communications from the server at any other time will have to wait until the next scheduled uplink.
  • Bi-directional end-devices with scheduled receive slots (Class B): End-devices of Class B allow for more receive slots. In addition to the Class A random receive windows, Class B devices open extra receive windows at scheduled times. In order for the End-device to open its receive window at the scheduled time, it receives a time synchronized Beacon from the gateway.
  • Bi-directional end-devices with maximal receive slots (Class C): End-devices of Class C have nearly continuously open receive windows, only closed when transmitting. Class C end-device will use more power to operate than Class A or Class B but they offer the lowest latency for server to end-device communication.

• Layer 3
  • https://www.lora-alliance.org/for-developers
  • LoRa-WAN ist eine Möglichkeit, ein Low Power Wide Area Network zu errichten

LoRaWAN Network Reference Model (NRM), roaming End-Device (aus LoRaWAN Backend Interfaces 1.0 Specification)

Hardware

Gateways

• http://www.dragino.com/products/lora/item/117-lg01-p.html

Plan

Standorte

Bei 2km Reichweite in Städten würden wir mit den ersten drei Gateways schon die komplette Innenstadt abdecken.