3GPP 24.501 v20.0.0 — the document's own text
9.11.3.18D Control plane service type
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 Control plane service type information element is to specify the purpose of the CONTROL PLANE SERVICE REQUEST message.
The Control plane service type information element is coded as shown in figure 9.11.3.18D.1 and table 9.11.3.18D.1.
The Control plane service type is a type 1 information element.
| 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
|---|---|---|---|---|---|---|---|---|
| Control plane service typeIEI | 0Spare | Control plane service typevalue | octet 1 |
Figure 9.9.3.18D.1: Control plane service type information element
Table 9.9.3.18D.1: Control plane service type information element
| Control plane service type value (octet 1, bit 1 to 3) | ||||
|---|---|---|---|---|
| Bits | ||||
| 3 | 2 | 1 | ||
| 0 | 0 | 0 | mobile originating request | |
| 0 | 0 | 1 | mobile terminating request | |
| 0 | 1 | 0 | emergency services | |
| 0 | 1 | 1 | emergency services fallback | |
| 1 | 0 | 0 | ||
| to | unused; shall be interpreted as " mobile originating request", if received by the network. | |||
| 1 | 1 | 1 | ||