On Sun, 30 Jan 2011 19:32:04 +0100, Steve Markgraf wrote:
Hi again,
On 30.01.2011 19:05, Steve Markgraf wrote:
In gsm 04.08 9.1.22.3 it says "The Mobile Identity 1 and 2 IEs shall not refer to IMEI.". So a standard compliant network should never do that.
"The reason why you see paging by IMSI in real-world GSM networks"
Sorry, I confused IMEI/IMSI. Forget about my last message, although Haralds blogpost may still be interesting in the context of this thread.
No, you were right about that, second part of my post was about imsis on air.
I already had read Haralds post but I'm not fully convinced of all of his explainations. At least not on modern state-of-the-art core networks. Too less ram or volatile storage on restarting VLRs, is that really still an issue there?
The third point, that expired tmsis on unreachable phones with a fallback on imsi paging as the main cause sounds much more convincing to me.
But as David pointed out, 10-25% imsi paging is a lot, even about constant 2-5% as I observed are much for a location area or whole msc area. Did anyone do some research on that?
Regards, Mad