LoraWAN

References

https://youtu.be/8Oxcp9wQQnk

Terminology

Lora vs LoraWAN

• Lora is the protocol, __Lo__ng __Ra__nge ; LoRa is Layer2
• LoraWAN is the IoT solution based on Lora technology

Lora Pro/Cons

• ISM Open frequency(415,868,915MHz, free ; no license required
• Interference ; low data rate

Limitations / Parameters

Target: transmission message about 10 km and the battery last for 2 years.

• Frequency: Pay attention to band requirement per country
• Tx power (transmission power): 2-14 dbm / 5-20 dBm; the higher the power , the longer distance signals can cover
• Bandwidth (125/250/500 KHz): the higher the more data can be include in one transmission; the higher the bandwidth, the shorter battery life, the shorter range and more interference.(??); checked the local laws
• spreading factor: (7-12), the larger spreading factor, the longer distance and shorter battery life.
• coding rate: 4/5, 4/6, 4/7, 4/8,
  4/5 means 5 error bits used to correct 4 bit of data. The more coding rate, means your data can transfer longer distance but lower battery life.

LoRa Device

• Lora Nodes:
  Normally will integrate sensor, transponder, mircrocontroler all together.
  Receive and transmit sensor data, send out via air using LoRa protocol

  • LoPy ; LORA GPS Hat; RN2483

• Gateway :
  Receive LoRa data via multi channels with different frequencies ; send out data to IP network.

  • IMST IC880A-SPI (8 channels at a time)

LoRaWAN

Layer 3 and 4 ;