Question: During a PGW-U (PDN Gateway - User plane) Restart, what information is included in specific messages to facilitate recovery?
Option 1: UE (User Equipment) IP Address
Option 2: Local PGW-U Recovery Time Stamp value
Option 3: Sx Association Identifier
Option 4: PDN (Packet Data Network) Type
Explanation: Including the local PGW-U Recovery Time Stamp value in Heartbeat Request/Response and Sx Association Setup Request/Response Messages during or after a PGW-U Restart is crucial for synchronizing the recovery process between the PGW-C (PDN Gateway - Control plane) and PGW-U. This timestamp helps in identifying the point of failure and efficiently restoring Sx sessions, ensuring minimal disruption to ongoing communications.