5 Jun
2009
5 Jun
'09
3:30 p.m.
On Friday 05 June 2009 16:53:47 Harald Welte wrote:
Wikipedia is certainly not the definitive anwer, but
as you can see
at http://en.wikipedia.org/wiki/IMSI_attach it claims that ATTACH is only
performed at the initial switch-on. Later on, it does a regular Location
Update.
Right, the spec agrees here (I stumbled across this today) and we need to fix
the code. It is written in 04.08 Section 4.4.3 (IMSI Attach)
"The IMSI attach procedure is used only if the update status is UPDATED and if
the stored Location Area Identification is the same as the one which is
actually broadcasted on the BCCH of the current
serving cell. Otherwise a normal location updating procedure (see sub-clause
4.4.1) is invoked independently of the ATT flag indication."
So I don't fully understand this yet, but it is a strong indication that
wikipedia is right...
greetings
z.