Hello,
We are trying to estimate battery lifetime of our devices. Here are two current profiles taking from the same device connected to Telenor LTE-M. The only difference in initial conditions is link loss (110 on the first picture, 140 on the second).
Here are the CONNEVAL readings from thouse two:
| Charge | 60mC | 250mC | |
| CE level | 0 | 1 | |
| TX power | 18 | 23 | |
| TX repetitions | 1 | 1 | |
| RX repetitions | 8 | 8 | |
| Path loss | 110 | 140 |
As you can see, in the second case the modem consumes much more power (looks like cDRX disabled?), so it would cost about six times as much lifetime-wise. The CONNEVAL results between those two are quite similar, the only difference between CE level (level 0 for the first profile and level 1 for the second), but the number of rx/tx repetitions is the same (1/8).
It would be desirable for us to be able to distinguish between those two cases based on device telemetry (e. g. CONNEVAL values) because naturally we can't measure current in the field. So my questions are:
- Can we assume elevated consumption/no cDRX based just on CE level?
- Is there a way to read active cDRX parameters/modem cDRX sleep duration? The sleep time in the 60mC profile was about 200ms, minimal threshold for %XMODEMSLEEP is 10240ms, is there any other way to detect if modem is sleeping?
