omsocombb not receiving calls

robert robert.steve07 at gmail.com
Thu Mar 10 09:37:42 UTC 2016


In system information type 3 I got the following info:

Control Channel Description
1 . . .    . . . .  = MSCR: MSC is Release ’99 onwards (1)
. 1 . .    . . . .  = ATT: MSs in the cell shall apply IMSI attach and detach procedure (1)
. . 00   1 . . .  = BS_AG_BLKS_RES: 1
. . . .     .110  = CCCH-CONF: 4 basic physical channels used for CCCH, not combined with SDCCCHs (6)
. 00 .    . . . .  = CBQ3: IU mode not supported (0)
. . . .     . 110 = BS-PA-MFRMS: 6 

This is the only info I got about CCCH description. I’m not sure if this is enough for telling that paging is done on other than timeslot 0.


Best regards,
Robert,





On Mar 9, 2016, at 4:00 PM, Sylvain Munaut <246tnt at gmail.com> wrote:

> On Wed, Mar 9, 2016 at 2:52 PM, robert <robert.steve07 at gmail.com> wrote:
>> Hi,
>> 
>> I didn’t find anything useful yet. Everything seems normal during the IMSI
>> attach procedure (location updating request, authentication
>> request/response, identity request/response …), I can call and send SMS
>> normally but the phone doesn’t get paged in any way. It seems strange that
>> no differences can be seen during the IMSI attach procedure while some sim
>> cards do not work.
> 
> The specs says it's possible to have paging channels on other time slots than 0.
> 
> I've never seen it any network do that and really not sure why they
> would. But support for it is not implemented in osmocom-bb ...
> 
> Record the BCCH system infos messages and look for the CCCH description in them.
> 
> 
> Cheers,
> 
>   Sylvain



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