3GPP 24.501 v20.0.0 — the document's own text
9.11.4.21 5GSM congestion re-attempt indicator
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 5GSM congestion re-attempt indicator information element is to indicate whether the back-off timer is applied in the registered PLMN or all PLMNs or in the registered SNPN or all equivalent SNPNs, and additionally to indicate whether the back-off timer is applied in the current access type or both 3GPP access type and non-3GPP access type.
The 5GSM congestion re-attempt indicator information element is coded as shown in figure 9.11.4.21.1 and table 9.11.4.21.1.
The 5GSM congestion re-attempt indicator is a type 4 information element with a length of 3 octets.
| 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
|---|---|---|---|---|---|---|---|---|
| 5GSM congestion re-attempt indicator IEI | octet 1 | |||||||
| Length of 5GSM congestion re-attempt indicator contents | octet 2 | |||||||
| 0Spare | 0Spare | 0Spare | 0Spare | 0Spare | 0Spare | CATBO | ABO | octet 3 |
Figure 9.11.4.21.1: 5GSM congestion re-attempt indicator
Table 9.11.4.21.1: 5GSM congestion re-attempt indicator
| ABO (All PLMNs Back-off timer) (octet 3, bit 1) | |
|---|---|
| Bit | |
| 1 | |
| 0 | The back-off timer is applied in the registered PLMN or registered SNPN. |
| 1 | The back-off timer is applied in all PLMNs or all equivalent SNPNs. |
| CATBO (Current Access Type Back-off Timer) (octet 3, bit 2)Bit2 | |
| 0 | The back-off timer is applied in both 3GPP access type and non-3GPP access type |
| 1 | The back-off timer is applied in the current access type |
| Bits 3 to 8 of octet 3 are spare and shall be encoded as zero. |