We are currently using EC25 with the QuecOpen solution for our products. Along with IoT SIM cards that are capable of connecting to cellular networks anywhere around the world (multi-operator SIM card that do not use network steering).
Our products are all set to use the automatic network scan mode (AT+QCFG=“nwscanmode” set to 0/automatic).
In most cases the cellular network chosen is more than suitable. However we do have a few products that seem to select networks that don’t seem suitable. For instance we have 2 devices within a few meters of each other, both in the same environment, however one is using LTE and has good signal and the other is using HSPA with a good signal. Therefore I’d like to know why it does that.
My question is how do the EC25 and QuecOpen do the automatic cellular network scan mode ? What’s the algorithm behind it ?
Or does the SIM card dictate which network to use ?
In another topic for BG95(M3) Stephen.Li-Q indicated that the BG95 did the network selection in the following way:
Is this also valid for the EC25 ?
I don’t seem to find anything on that in the EC25 or QuecOpen documentation.