3GPP 24.501 v20.0.0 — the document's own text
9.11.4.3 Always-on PDU session indication
Taught in 4. Inside TS 24.501, the document at the centre (CT1 — the group that writes what your phone says, overview).
The purpose of the Always-on PDU session indication information element is to indicate whether a PDU session is established as an always-on PDU session.
The Always-on PDU session indication information element is coded as shown in figure 9.11.4.3.1 and table 9.11.4.3.1.
The Always-on PDU session indication is a type 1 information element.
| 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
|---|---|---|---|---|---|---|---|---|
| Always-on PDU session indication IEI | 0Spare | 0Spare | 0Spare | APSI | octet 1 |
Figure 9.11.4.3.1: Always-on PDU session indication
Table 9.11.4.3.1: Always-on PDU session indication
| Always-on PDU session indication (APSI) (octet 1) | |
|---|---|
| Bit | |
| 1 | |
| 0 | Always-on PDU session not allowed |
| 1 | Always-on PDU session required |
| Bits 2, 3 and 4 are spare and shall be coded as zero, |