Spec-3GPP TS 23.501:
An always-on PDU Session is a PDU Session for which User Plane resources have to be activated during every transition from CM-IDLE mode to CM-CONNECTED state. If a PDU session is an always-on PDU session, the SMF should not deactivate a UP connection of this PDU session due to inactivity!
LinkedIn: 
| Topic | Replies | Views | Activity | |
|---|---|---|---|---|
| Default Bearer & Always-on IP in 5G | 5 | 3663 | September 10, 2021 | |
| Multiple PDU Sessions | 3 | 7446 | July 12, 2021 | |
| Number of NR-U DUD without any PDCP PDU sent over X2-U at gNB-CU | 1 | 93 | June 13, 2024 | |
| One PDU session mapped to multiple DRB | 7 | 8751 | August 8, 2023 | |
| Is there any possiblity UE is served by two separated PDU connections at the same time? | 1 | 410 | September 7, 2023 | |
| How many maximum 5QI we can create under one PDU Session? | 2 | 85 | August 2, 2024 | |
| What is C-DRX (Connected Mode DRX) in NR? | 4 | 1559 | May 19, 2023 | |
| UE doesn't initiate PDU session although all call flow is successfully done | 8 | 557 | May 19, 2023 | |
| What is Dynamic TDD in 5G? | 0 | 1777 | March 22, 2022 | |
| What content is sent in MSG3 during NR RACH in ENDC? | 21 | 5001 | June 13, 2021 |
