Understanding call flows is essential for troubleshooting and network optimization. Here are the most critical procedures: 1. The Attach Procedure
The MME signals the S-GW and P-GW to create a "Default Bearer," which provides the user with an "always-on" IP connectivity.
Once the UE arrives at the new cell, the MME tells the S-GW to switch the user plane path to the target eNodeB. 3. UE-Requested PDN Connectivity