Which RSSI and SNR are considered as good radio level for LoRaWAN ™ Senlab ™ devices ?
Addition of RSSI and SNR must be considered to evaluate the radio link quality.
- RSSI is the signal level reception
- SNR is the signal noise rate and give indication on the ambiant noise level
- Radio link can be considered has GOOD when RSSI > -115dB and SNR > -7dB
- Radio link is BAD (range limit) when RSSI <= -120 dB or SNR <= -13dB
- Between this 2 cases,
o If RSSI is good (> -115dB) but SNR bad (<= -13dB),
It means that the environment is very noisy.
SNR must be checked during many days to be sure that the radio link is enough stable to receive all messages.
o If RSSI is bad ( <=-120dB) but SNR good (> -7dB),
It means that device is probably far away from the gateway.
We have to check that no additional obstacle will take away “virtually” a little more the device.
Radio level analysis