Bug #1024 related power measurement of the GSM modem

[Stefan Schmidt]

Hello.

On Tue, 2008-12-02 at 09:31, Dieter Spaar wrote:
>
> 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.

Pity. I will see if I can make some more logs this week.

> 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 ;-) ]

I would know a source for it, so will you. :)

> 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 wrong part comes into play if one keep in mind that the phone sits on the
same place all the time.

> 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 ?

I haven't counted it so far.

> What image do you run on your phone ?

FSO milestone 4.1

> 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).

Hmm, mickey would know if this is a bug or feature. :)

>> 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.

Will try to produce them this week.

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

Of course my hope, too. :)

regards
Stefan Schmidt