Location Updates T

here are total 3 types of location updates

IMSI Attach/Detach

Normal Location Update

Periodic Location Update


Normal location updating

MS has to do a location update in new location area when it crosses a LAC border.

IMSI attach location updating procedure

When mobile switch ON it has to do a location update
When moving from non coverage area to a coverage area MS has to do a location update if LAC is different from stored LAC
When mobile switch OFF it has to detached from the network



Periodic location updating (T3212 timer is used)
The network has to do a periodic location updates to update the subscribers in each location area.