LTE Tracking Area Update Flow

Tracking Area Update take place on below given conditions:

• UE detects it has entered a new Tracking Area that is not in the list of TAIs that the UE registered with the network.
• The periodic Tracking Area update timer has expired.
• UE was in UTRAN PMM_Connected state (e.g. URA_PCH) when it reselects to E UTRAN.
• UE was in GPRS READY state when it reselects to E UTRAN.
• The TIN indicates "P-TMSI" when the UE reselects to E-UTRAN (e.g. due to bearer configuration modifications performed on GERAN/UTRAN).
• The RRC connection was released with release cause "load re-balancing TAU required.
• A change of the UE Core Network Capability and/or UE Specific DRX Parameters information of the UE.

Download from here to know more......