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TI 01W06A51-10EN
5. Glossary
• RSSI (Received Signal Strength Indicator)
Indicates the strength of wireless signals received by a wireless communication device in dBm
units. The RSSI is an important value required to confirm communication quality. In general,
the stronger the signal is, the more stable communications will be. On the other hand, if
high-level noises exist in the same communication bandwidth, it may be difficult to establish
communications even if the RSSI is high. In such a case, check the communication environment
together with the SNR value described later.
You can check two RSSI values in the Sushi Sensor system.
RSSI measuring
device
Checking method
RSSI from gateway
to Sushi Sensor
communication
Sushi Sensor
• Sushi Sensor App (Android device tool)
• Health report the application is periodically notified of
by the sensor
RSSI from Sushi Sensor to
gateway communication
Gateway
• Gateway management screen
For details on the checking method, refer to the instruction manual of the Application, each
sensor or gateway.
• SNR (Signal Noise Ratio)
Indicates the ratio of the strength of wireless signals for LoRaWAN communication to that of other
ambient noise signals. The higher the SNR value is, the more stable LoRaWAN communication
will be. When the SNR value is low, communication errors may occur even if the RSSI value is
high. The LoRa modulation used in LoRaWAN communication has the advantage of enabling
communications even if the communication signal level is lower than the ambient noise level. In
such an environment, the SNR may be a negative value.
You can check two SNR values in the Sushi Sensor system.
SNR measuring
device
Checking method
SNR from gateway to Sushi
Sensor communication
Sushi Sensor
• Health report the application is periodically notified of
by the Sushi Sensor
SNR from Sushi Sensor to
gateway communication
Gateway
• Gateway management screen
For details on the checking method, refer to the instruction manuals of the Application, the Sushi
Sensor and the gateway.
Mar.26,2019-00
