4g Lte Evolved Packet Core Epc Concepts | And Call Flows Download Hot Updated

It reduces the number of network nodes between the user terminal and the internet, minimizing latency.

Anchors the data path during inter-eNodeB handovers. It reduces the number of network nodes between

This procedure is documented extensively in 3GPP TS 23.401. It joins RRC access, NAS registration, S1AP transport, GTPv2-C session setup, and Diameter subscriber handling into one control path. It joins RRC access, NAS registration, S1AP transport,

– Used when the X2 interface is not available or when the MME/SGW must change. It relies on the core network for coordination and typically incurs higher latency than X2-based handover. MME sends an attach accept message to the UE

MME sends an attach accept message to the UE. B. Service Request Procedure (Idle to Active)

After the default bearer is up, a dedicated bearer can be added to provide differentiated QoS for specific services (e.g., VoLTE).

: Carries control-plane signaling using S1AP (S1 Application Protocol) over SCTP. It transports NAS messages from the UE and manages eNB/MME procedures.