(1)
TAI - Tracking Area Identity
The Tracking Area identity is the identity used to identify tracking areas. The Tracking Area Identity is constructed from the MCC (Mobile Country Code), MNC (Mobile Network Code) and TAC (Tracking Area Code).
(2)
In any cellular network the tracking area is allocated to a group of eNodebs. This is mainly done so that the UE can easily be tracked and paged. If the mobile is at the border of a tracking area then the Location area code can vary from e NodeB to eNodeB but if the UE is not at the border of tracking area then it would not vary. (The MME keeps track of the location of all UEs in its service area. When a UE makes its first registration to the network, the MME will create an entry for the UE, and signal the location to the HSS in the UE’s home network. The MME will then keep tracking the UE’s location either via connection to eNodeB or at the level of Tracking Area, which is a group of eNodeBs. MME is involved in every eNodeB change. An idle UE will report its location either periodically, or when it moves to another Tracking Area.)