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A TA is a set of eNodeBs that are defined by a UE itself.

A TA is the smallest geographical area in which a UE can roam without performing a Tracking Area Update (TAU) other than periodic TAU as required.

A Tracking Area Identity (TAI) is used to identify each tracking area.

The Tracking Area Identity (TAI) is assigned by the service provider.

One TA may be served by one or more than one MME.

The UE is served by an eNodeB.

The eNodeB selects one MME to serve the UE.

The MME selects one SGW to serve the UE.

The SGW selects one PGW to serve the UE

The PGW selects one PCRF server if required.

The SGW performs downlink data buffering while the S1 bearer is being established.

The SGW initiates the paging messages towards the UE.

The PGW is not aware of the paging process.

The UE initiates the service request procedure once it receives the paging message.

The paging procedure is controlled by the MME.

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