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Harald Welte laforge at gnumonks.orgOn Sat, Jun 06, 2009 at 10:41:00AM +0200, Dieter Spaar wrote:
> Hello Harald,
>
> On Sat, 6 Jun 2009 10:03:38 +0200, "Harald Welte" <laforge at gnumonks.org> wrote:
> >
> > In other words: IMSI ATTACH/DETACH is only used in addition to regular Location
> > Update, and it is used in situations where a MS on a network with ATT=0 would
> > not perform any signalling with the network at all.
>
> I have read at some places that the idea of IMSI ATTACH/DETACH is to
> save resources of the network, if its is know that an MS is off (IMSI
> DETACH was sent) there is no need to allocate resources for paging the
> MS. IMSI ATTACH is the reverse, it tells the network that the phone is
> back again. Its up to the operator to use this feature. I am not sure
> if this is the real motivation, but it makes sense for me.
yes, that's what I've figured, too. You rather don't want to page a MS that
the user has intentionally switched off to save paging slots on the PCH...
--
- Harald Welte <laforge at gnumonks.org> http://laforge.gnumonks.org/
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