3GPP 24.501 v20.0.0 — the document's own text
8.2.16.1 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 SERVICE REQUEST message is sent by the UE to the AMF in order to request the establishment of an N1 NAS signalling connection, to request the establishment of user-plane resources for PDU sessions which are established without user-plane resources, or both. See table 8.2.16.1.1.
Message type: SERVICE REQUEST
Significance: dual
Direction: UE to network
Table 8.2.16.1.1: SERVICE REQUEST 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 | |
| Service request message identity | Message type9.7 | M | V | 1 | |
| ngKSI | NAS key set identifier9.11.3.32 | M | V | 1/2 | |
| Service type | Service type9.11.3.50 | M | V | 1/2 | |
| 5G-S-TMSI | 5GS mobile identity9.11.3.4 | M | LV-E | 9 | |
| 40 | Uplink data status | Uplink data status9.11.3.57 | O | TLV | 4-34 |
| 50 | PDU session status | PDU session status9.11.3.44 | O | TLV | 4-34 |
| 25 | Allowed PDU session status | Allowed PDU session status9.11.3.13 | O | TLV | 4-34 |
| 71 | NAS message container | NAS message container9.11.3.33 | O | TLV-E | 4-n |
| 29 | UE request type | UE request type9.11.3.76 | O | TLV | 3 |
| 28 | Paging restriction | Paging restriction9.11.3.77 | O | TLV | 3-35 |