3GPP 24.501 v20.0.0 — the document's own text
8.2.11.1 Message definition
Taught in 4. Inside TS 24.501, the document at the centre (CT1 — the group that writes what your phone says, overview).
The DL NAS TRANSPORT message transports message payload and associated information to the UE. See table 8.2.11.1.1.
Message type: DL NAS TRANSPORT
Significance: dual
Direction: network to UE
Table 8.2.11.1.1: DL NAS TRANSPORT 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 | |
| DL NAS TRANSPORT message identity | Message type9.7 | M | V | 1 | |
| Payload container type | Payload container type9.11.3.40 | M | V | 1/2 | |
| Spare half octet | Spare half octet9.5 | M | V | 1/2 | |
| Payload container | Payload container9.11.3.39 | M | LV-E | 3-65537 | |
| 12 | PDU session ID | PDU session identity 29.11.3.41 | C | TV | 2 |
| 24 | Additional information | Additional information9.11.2.1 | O | TLV | 3-n |
| 58 | 5GMM cause | 5GMM cause9.11.3.2 | O | TV | 2 |
| 37 | Back-off timer value | GPRS timer 39.11.2.5 | O | TLV | 3 |
| 3A | Lower bound timer value | GPRS timer 39.11.2.5 | O | TLV | 3 |