Bug #1024 related power measurement of the GSM modem

[Dieter Spaar]

Hello Stefan,

Stefan Schmidt wrote:
> To follow up on the #1024 traces. I fear you are still not able to reproduce the
> re-camping?
>   

No, I cannot reproduce it here. It seems that it requires a special GSM
net situation.

 From the PCO2 logs you made, it look like this without applying the
AT%SLEEP=2 workaround (Thank you for allowing to post this trace
overview). All times are relative, CID is the cell ID:

00:06:04:667   MMR_REG_CNF received: LAC: 0020, CID: DACC
00:09:37:249   MMR_REG_CNF received: LAC: 0020, CID: DAB8
00:11:45:560   MMR_REG_CNF received: LAC: 0020, CID: 00CA
00:12:41:293   MMR_REG_CNF received: LAC: 0020, CID: C834
00:14:24:681   MMR_REG_CNF received: LAC: 0020, CID: DACC
00:14:48:234   MMR_REG_CNF received: LAC: 0020, CID: DAB8
00:15:23:502   MMR_REG_CNF received: LAC: 0020, CID: 00C0
00:16:22:414   MMR_REG_CNF received: LAC: 0020, CID: DACC
00:16:49:465   MMR_REG_CNF received: LAC: 0020, CID: 00CA

It seems that you have at least five cells for your network around
which can be received with a similar level. [ Hey, I think I have
buy more BS-11 base stations and  install all of them to get
something similar here ;-) ]

On a first look the cell re-selections are done because
the GSM modem has decided that a different cell is better
than the current one. I would say that this is not necessarily
a wrong behavior of the GSM modem.

The situation is similar with the AT%SLEEP=2 workaround applied:

00:03:44:457   MMR_REG_CNF received: LAC: 0020, CID: DAB8
00:03:58:336   MMR_REG_CNF received: LAC: 0020, CID: 00CA
00:04:32:477   MMR_REG_CNF received: LAC: 0020, CID: DACC

(The trace is shorter so there are not that many cell re-selections).

Is this a similar frequency of cell re-selections you see when Bug #1024
is occurring ?

What image do you run on your phone ? I ask because I can see regular
activity on the AT command interface. For example every minute the
modem is asked about its SMS status (I wonder why the modem has
to be polled and why the unsolicited status messages from the modem
are not enough to find out if a new SMS has arrived).

> I still have the option open to have PCO2 disconnected and try to get some
> traces once the phone starts to show the bug.
>   

Yes, this would be great if you could try it out. Maybe there is a 
different
behavior than.

> I'm pretty busy with FSO tasks, so I can not spend to much time on this, but I
> would give this test a go if you think it will give you more hints.
>
>   

I really appreciate your help. Hopefully if gives some hints to what is 
going on.

Best regards,
  Dieter