I have made a product with the HL7692 that works fine when we test it.
However when we move it in the field, where the overall signal quality is worse of LTE. We notice that the device is sometimes not reachable.
We think it’s caused by the fact that the signal quality is to low and the bit error rate is to high. However the CSQ is good enough to keep the module registered to the network.
The CSQ is always around 0-1 and the LTE band used is 99% of the time LTE Band 3 (1800 MHz). Sometimes the band changes to LTE Band 20 (800 MHz) which has a CSQ of around 10-12
- Why does the HL7692 keeps switching to band 3, while band 20 has a much better signal quality? Can I’ve influence on this pattern without completely disabling band 3?
- Can I’ve influence on the receiving/transmitting strength of the module?
NOTE with unreachable I mean, a tcp client was unable to setup a connection with the module within an acceptable time. Probably caused by to many packets lost/…