3GPP 24.501 v20.0.0 — the document's own text
8.6.27.1 Message definition
The SECURITY MODE REJECT message is sent by the UE to the AMF to indicate that the corresponding security mode command has been rejected. See table 8.2.27.1.1.
Message type: SECURITY MODE REJECT
Significance: dual
Direction: UE to network
Table 8.2.27.1.1: SECURITY MODE REJECT message content
| IEI | Information Element | Type/Reference | Presence | Format | Length |
|---|---|---|---|---|---|
| Extended protocol discriminator | Extended protocol discriminator9.2 | M | V | 1 | |
| Security header type | Security header type9.3 | M | V | 1/2 | |
| Spare half octet | Spare half octet9.5 | M | V | 1/2 | |
| Security mode reject message identity | Message type9.6 | M | V | 1 | |
| 5GMM cause | 5GMM cause9.11.3.2 | M | V | 1 |