Question 1:
The nRF9160 datasheet V2.0 claims the sensitivity is: CATM=-108dBm (mid band); NBIOT=-114dBm (mid band).
However when the unit connects, we get a printout for the RSRP=-130dBm
How could we get this number for the RSRP if we are below the sensitivity limit?
Please see attached image – the text in GREEN
Question 2:
We try to estimate battery life.
The numbers in the NORDIC calculator are “too good to be true”
the customer sensor connects to the network once per day (every 24 hours) to transmit about 100KB and receive about 2KB.
In between the application still runs on the nRF9160 in the background (using timers and IDLE), while the radio section is shutdown.
The sensor DOES NOT use the on-board GPS. Our application does not require the GPS.
We would like to accelerate this behavior by scheduling the connection + transmit of 100KB every 30 minutes- thus achieving x48 acceleration
Is our concept correct? (the sleep current of a few [uA] is negligible for us)
The source of the question is – would the cellular network – or the modem – have memory of the network, thus the connection every 30 minutes is easier than every 24 hours
(for example, similar to the difference between WARM start and COLD start of the GPS)
Many thanks
