Initiated when the UE has data to send or receive while in idle mode, re-establishing the radio and S1 bearers. Ensures seamless connectivity as a UE moves between cells. Intra-frequency handovers occur when the UE stays on the same carrier layer. Tracking Area Update (TAU):
The MME contacts the S-GW/P-GW chain with a Delete Session Request . The gateways tear down the active default and dedicated bearers, returning the allocated IP address back into the pool.
The EPC is composed of several logical nodes, each with a distinct role in managing subscriber data and network traffic [1]. A. MME (Mobility Management Entity) The primary control plane node.
For a UE in an active call or data session, handovers ensure service continuity.
The MME selects an S-GW and P-GW, then sends a Create Session Request to the S-GW. The S-GW passes this to the P-GW.
The process where a user turns on their phone and connects to the LTE network.
Determines policy rules, such as QoS and charging, for a subscriber and instructs the PGW to enforce them. 3. Essential 4G LTE EPC Call Flows
: Uses the Diameter protocol for subscription management and authentication. The MME sends an Update Location Request to the HSS, which responds with the user's subscription data.
4g Lte Evolved Packet Core Epc Concepts And Call Flows Download __full__ Hot Jun 2026
Initiated when the UE has data to send or receive while in idle mode, re-establishing the radio and S1 bearers. Ensures seamless connectivity as a UE moves between cells. Intra-frequency handovers occur when the UE stays on the same carrier layer. Tracking Area Update (TAU):
The MME contacts the S-GW/P-GW chain with a Delete Session Request . The gateways tear down the active default and dedicated bearers, returning the allocated IP address back into the pool.
The EPC is composed of several logical nodes, each with a distinct role in managing subscriber data and network traffic [1]. A. MME (Mobility Management Entity) The primary control plane node.
For a UE in an active call or data session, handovers ensure service continuity.
The MME selects an S-GW and P-GW, then sends a Create Session Request to the S-GW. The S-GW passes this to the P-GW.
The process where a user turns on their phone and connects to the LTE network.
Determines policy rules, such as QoS and charging, for a subscriber and instructs the PGW to enforce them. 3. Essential 4G LTE EPC Call Flows
: Uses the Diameter protocol for subscription management and authentication. The MME sends an Update Location Request to the HSS, which responds with the user's subscription data.
