If link is poor…or if congestion is there on SDCCH…due to which MS was not able to complete IMSI detach….then how can it will be able to complete the LA. Assuming that MS is in the same cell/LA….I think due to its less significance
the GSM specifications has left it on the operator as an optional feature.
I don’t know whether MSC/VLR can only change the time of periodic LA or the
can even enable or disable it.