RE: [RFCv2] doc: Proposal for LTE/IMS API

[Kjetil ASDAL]

Hi Rémi,

Rémi wrote:
  +   The registered application is tracked, if the
  +   application exits the registration will be
  +   automatically released.
  +
  +   Related AT command: AT+EISR.
 
 Is this a standard command? As it is not in the 3GPP namespace
 (AT+C...), it
 might be nice to provide a reference pointer.

We should remove the reference above as it is incorrect. There is 
no standard AT command specified for this as of today, however, we 
will be entering a CR on 3GPP TS 27.007 in the upcoming meeting to 
address the lack of such a command.

BR
Kjetil
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RE: Selecting multiple radio access technologies in oFono

[Kjetil ASDAL]

Hi Lucas,

Lucas wrote:
 
 I don't know about LTE, but I can effectively disable umts in my
 huawei modem just by choosing a frequency not available in my country.
 Then, when going online the modem is forced to use one of the GSM
 ones.
 
That may very well be so, but I still think this is at best a funny way 
to disable LTE (or any other RAT for that matter). I should come right 
out and say that I am far from an expert on how the radio stack operates, 
but I suspect that by doing what you propose, the radio will have to do 
periodical measurements to see if the chosen frequency band has become 
available, and this could result in some extra power consumption.

 It depends on the modem. See the implementation for huawei in
 drivers/huaweimodem/radio-settings.c:huawei_set_band(). It uses the
 AT^SYSCFG command that is specific to huawei modems.

Of course you are right; it definitely depends on the modem and what AT 
commands are supported. What I meant (but did not write) was that there 
are no standard AT commands (i.e. from 3GPP TS 27.007) for this.

Regards, 
Kjetil
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