Hello Harald,
On Sat, 6 Jun 2009 10:03:38 +0200, "Harald Welte" laforge@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
On 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@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...
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Dieter Spaar -
Harald Welte