NBIOT TX Consumption vs LTEM

RE: NBIOT TX Consumption vs LTEM

Didrik Rokhaug — Wed, 04 May 2022 14:48:53 GMT

What happens while you are in an RRC connection is controlled by the network, and the device does not have any way to affect it (other than how much data is transmitted).

Based on your power profiler trace, it looks like the cDRX interval is set very short in your LTE-M network, which will drastically affect the power consumption.

RE: NBIOT TX Consumption vs LTEM

maupicco — Tue, 03 May 2022 16:36:04 GMT

Yes,

it is clear to me that the RCC inactivity timer is about 5 sec.

The big problem is the consumption during the idle period of RCC.
As you can see from the power profile picture, the power consumption in RCC is HIGH.

I don't know how to check the cDRX parameters in use, they seems the problem is power consumption during RCC inactivity.

Is it possible to somehow verify the cDRX parameters?
Is it possible to set the parameters in some way to reduce consumption?

Nordic's online power profiler always shows much lower consumption values in the various configurations.

I would like to be able to discriminate if abnormal consumption is:
- caused by the network provider
- caused by an incorrect configuration of the nordic module.

RE: NBIOT TX Consumption vs LTEM

Didrik Rokhaug — Tue, 03 May 2022 16:09:47 GMT

Looking at your trace, it seems the RRC inactivity timer in the LTE-M network is ~5s.

[quote user=""]UDP_RAI_ENABLE in the example but the consumption is always the same.[/quote]

RAI can help, but is only supported for NB-IoT (control plane RAI) in the udp sample.

RE: NBIOT TX Consumption vs LTEM

maupicco — Tue, 03 May 2022 07:17:26 GMT

Hi Didrik,

I upload the TRACE file. Can you please help me to identify the correct parameter?
Maurizio

RE: NBIOT TX Consumption vs LTEM

maupicco — Fri, 29 Apr 2022 06:47:08 GMT

Hi Didrik,

I'm using the same network (Telenor/Telia). I tested it using the two network with the same result.

I enabled the trace and now I attach the file.

In my version of Tace Collector V2 preview (v 0.0.11) I don't find the network parameter for OPP. Please give me instruction about it.

devzone.nordicsemi.com/.../LTEM_2D00_trace_2D00_2022_2D00_04_2D00_28T15_2D00_10_2D00_51.693Z.bin

devzone.nordicsemi.com/.../LTEM_2D00_trace_2D00_2022_2D00_04_2D00_28T15_2D00_10_2D00_51.693Z.pcapng devzone.nordicsemi.com/.../NBIOT_2D00_trace_2D00_2022_2D00_04_2D00_29T06_2D00_25_2D00_14.542Z.bin devzone.nordicsemi.com/.../NBIOT_2D00_trace_2D00_2022_2D00_04_2D00_29T06_2D00_25_2D00_14.542Z.pcapng

RE: NBIOT TX Consumption vs LTEM

Didrik Rokhaug — Thu, 28 Apr 2022 13:04:28 GMT

Hi,

Are you connected to the same network (Telenor/Telia) when switching between LTE-M and NB-IoT?

If you take a modem trace, we can look at the communication with the network to see what causes the big difference. And, with the Trace Collector V2 preview, you can use the modem trace to get the network parameters used by the Online Power Profiler to estimate the power.

Best regards,

Didrik