Question: In a scenario where an MME/SGSN informs an SGW to delay Downlink Packet Data Notifications for all served UEs, and the parameter D is handled by the SGW-U, how does the SGW-C initially communicate this delay to the SGW-U for new Sx sessions?
Option 1: Through a dedicated Delay Notification message sent after the Sx session establishment.
Option 2: By including the parameter D in the Sx session modification message only when transitioning to a buffering state.
Option 3: Via an update to the existing Sx report acknowledgement message without any session state change.
Option 4: By incorporating the parameter D within the initial Sx session establishment message for new Sx sessions.
Explanation: According to the described procedure, when the parameter D is handled by the SGW-U, the SGW-C must inform the SGW-U about this delay through the initial setup of new Sx sessions. This ensures that the SGW-U is aware of the delay requirement from the outset, allowing it to properly handle Downlink Packet Data Notifications as instructed. Incorporating parameter D within the Sx session establishment message for new sessions is the correct method for initial communication.