: The MME instructs the S-GW to release the user plane resources associated with the eNodeB. The S-GW stops forwarding downlink data and buffers it instead.
Determines whether a bearer can be established or dropped during network congestion. Step-by-Step LTE Call Flows 1. The Initial Attach Procedure
As the world shifted from voice-centric networks to data-centric ecosystems, the telecommunications infrastructure required a complete overhaul. Enter and its backbone, the Evolved Packet Core (EPC) . : The MME instructs the S-GW to release
Understanding 4G LTE Evolved Packet Core (EPC): Architecture, Concepts, and Essential Call Flows
Established for specific services needing higher QoS, such as VoLTE. 5. Download Resources: LTE/EPC Call Flows (Hot Topics) Step-by-Step LTE Call Flows 1
The MME coordinates with the target eNodeB and S-GW to reserve resources.
The UE sends an Attach Request to the MME via the eNodeB. continue exploring resources from 3GLTEInfo
+---------------------------------------------+ | HSS (Database) | +----------------------+----------------------+ | | S6a (Diameter) | +------+ S1-MME +------+------+ S11 +--------+ | eNB |-------------->| MME |------------>| S-GW | | (4G | (NAS/S1AP) +-------------+ +---+----+ | Base | | | Stn) |-----------------------------------------------+ S5/S8 | | S1-U (GTP-U) | +------+ +---+----+ +-----------+ | P-GW |------| PDN / IP | +---+----+ SGi | Internet | | +-----------+ | Gx +---+----+ | PCRF | +--------+ 1. Mobility Management Entity (MME)
S-GW re-routes user data packets to the new target eNodeB to ensure service continuity. 4. EPC and Future Evolution
For more in-depth guides and the latest 3GPP updates, continue exploring resources from 3GLTEInfo, Netmanias, and the documents shared above.