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The attach procedure registers the UE with the EPC, establishes a default EPS bearer, and provides IP connectivity.
Interfaces connect network elements and allow them to exchange control and user plane messages. The following are the most critical EPC interfaces:
: Interacts with the HSS to authenticate the user during attach procedures. The attach procedure registers the UE with the
Understanding network identifiers is crucial for reading logs and call flows:
When a UE in idle mode moves into a new Tracking Area (TA) not in its TA List, it initiates a TAU. This suggests a technical article covering LTE EPC
Connects the MME to the S-GW for session creation and management.
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Connects the P-GW to external IP networks (Internet/IMS). 3. Detailed 4G LTE Attach Call Flow
When a device powers down or disconnects from the network, it cleanly releases resources: The UE sends a Detach Request to the MME.