TAU Procedure

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TAU Procedure

The tracking area update
(TAU) procedure is triggered if one of the following conditions is
met:

The UE detects that the current TA does not exist in the TA list
on the UE-registered network.
It is a periodic TAU.
The access type of the UE is changed.
The load re-balancing TAU is required.
The TAU procedure is triggered during a handover procedure.

On an EPS network, the basic unit of location management
is TA List. A TA List consists of one or multiple TAs. A TA list prevents
a UE from initiating the TAU procedure frequently. In USN1.1, a TA
is regarded as a TA List by default.

In a TAU procedure, the
S-GW is also relocated. Figure 12 shows the TAU
procedure with S-GW relocation