16 Oct
2018
16 Oct
'18
2:47 p.m.
On 15/10/18 12:40, Neels Hofmeyr wrote:
On Fri, Oct 12, 2018 at 12:10:25PM +0200, Keith
wrote:
Ah! Well that's something I did not know, I'm not sure it is what I
observed (memory tells me not), but I'll check it all out again.
With the split setup it involves a complete loss
of service, basically,
as you say, until location update timeout.
Not complete loss of service:
* any phone that contacts the network to get something done will be told to
re-attach. So sending things and calling out (MO) will work.
Another (less elegant) idea I'm having is that we do have some notion of which
IMSIs were attached in the HLR database. They have the VLR number stored to
match the MSC's identification. If we could employ some tool to graze the HLR
db, and over a period of time invoke pagings for all those subscribers, we
could blanket re-attach everyone within a short time. I think I'd make that an
external tool using the CTRL interface, with some spread over time to not
insanely load the network. The one mild problem with this is, it doesn't look
like we notify the HLR on phones detaching. That could be resolved by also
storing a timestamp of when a subscriber was last attached in the HLR, which I
suggest makes sense anyway.
I suggest it does too. In fact, I think it is 100% necessary for the
distributed GSM idea where we send broadcast probes to various HLRs
asking them for the timestamps of the last seen LUR of an apparently
attached (t)IMSI.
thanks!
k/