Hi,
I saw something wierd using misdn_log to see the Abis communication : even if i don't call or send SMS I can see a periodic paging and a periodic RACH answer. The period of the paging is 2.6 seconds. The RACH appears 16 or 17 ms after the paging. In attached file the capture (open with wireshark) : 1. a call Mobile1(Nokia6310i)-->2(Ericsson) 2. a SMS Mobile 1-->2 3. a call Mobile 2-->1 4. a SMS Mobile 2-->1 Between these 4 operations we can see lot of paging and RACH with no interruption.
Does anyone understand this?
Btw the SMS doesn't work for me. It is transmitted towards the BTS but not fowarded from the BTS to the 2nd mobile.
Eric Cathelinaud
2009/7/23 Eric Cathelinaud e.cathelinaud@googlemail.com
Oh nice thanks for the information
Best regards Eric Cathelinaud
2009/7/23 Dieter Spaar spaar@mirider.augusta.de
Hello Eric,
On Thu, 23 Jul 2009 11:35:33 +0200, "Eric Cathelinaud" < e.cathelinaud@googlemail.com> wrote:
I would like to ask another question. I can see on which time slot the
burst
is sent but i can't see the frame and the multiframe number. Is it
available
somewhere?
Not in the Abis communication, its the BTS which cares about frames but not the BSC. For the nanoBTS it is most certainly possible to get debug traces from the debug port (but probably not on Abis) which contain the frame number, but I am not aware that the same is possible for the BS-11.
If you are interested in this low-level Layer 1 stuff, you might have a look at OpenBTS, you can adjust nearly everything or trace at a really low level.
Best regards, Dieter -- Dieter Spaar, Germany spaar@mirider.augusta.de