modem lte_lc_offline , lte_lc_normal()

[ephraim]

Dear Sir.

I use these commands to connect the Modem ON and OFF.

I need to know  if the result of the these commands the Modem communicates with the Cell tower ?

Please Advide.

[Albrecht Markus Schellenberger]

Hello Ephraim,

I need to know  if the result of the these commands the Modem communicates with the Cell tower ?

I’m not quite sure if I fully understand your question. But yes, lte_lc_normal() basically is a wrapper for AT+CFUN=1, setting the modem to normal operation mode. lte_lc_offline() however, will not result in search for a network, but send the modem to offline mode.

Regards,

Markus

[ephraim]

Hi.

We are testing our custopm board which has printed antenna ,

current consumption during TX .

1. If in line of sight with the cell tower , current is 5 to 10 ma.

2. outdoor 40 to 60 ma.

3. Inside building 350 to 500 ma.

I know that the Modem and cell tower negotiate  to detrmeine the Modec tx power needed.

Which routine is responsible for it ?.

What realy happens with the command lte_lc_normal()  ?.

Does is communicate wit the Cell tower ?.

Thanks

[Albrecht Markus Schellenberger]

Hello Ephraim,

ephraim said:

I know that the Modem and cell tower negotiate  to detrmeine the Modec tx power needed.

Well, the modem and network negotiate about Active Time and Tracking Area Update for Power Saving Mode (PSM). But this is not connected to a specific tx power value, as this can differ quite a lot.

ephraim said:

Which routine is responsible for it ?.

The responsible interface for this is the AT commando +CPSMS. The result of the negotiation can be visualised via +CEREG, with unsolicited result codes enabled on level 4 or 5.

ephraim said:

What realy happens with the command lte_lc_normal()  ?.

It is a wrapper running the AT command “AT+CFUN=1”, which sets the modem to full functionality.

ephraim said:

Does is communicate wit the Cell tower ?.

Yes.

Regards,

Markus