6 Jun
2009
6 Jun
'09
6:41 a.m.
Hello Harald,
On Sat, 6 Jun 2009 10:03:38 +0200, "Harald Welte" <laforge(a)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.
Best regards,
Dieter
--
Dieter Spaar, Germany spaar(a)mirider.augusta.de