3GPP 24.501 v20.0.0 — the document's own text
9.11.3.32 NAS key set identifier
Taught in 4. Inside TS 24.501, the document at the centre (CT1 — the group that writes what your phone says, overview).
The NAS key set identifier is allocated by the network.
The NAS key set identifier information element is coded as shown in figure 9.11.3.32.1 and table 9.11.3.32.1.
The NAS key set identifier is a type 1 information element.
| 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
|---|---|---|---|---|---|---|---|---|
| NAS key set identifier IEI | TSC | NAS key set identifier | octet 1 |
Figure 9.11.3.32.1: NAS key set identifier information element
Table 9.11.3.32.1: NAS key set identifier information element
| Type of security context flag (TSC) (octet 1) | |||
|---|---|---|---|
| Bit | |||
| 4 | |||
| 0 | native security context (for KSIAMF) | ||
| 1 | mapped security context (for KSIASME) | ||
| TSC does not apply for NAS key set identifier value "111". | |||
| NAS key set identifier (octet 1) | |||
| Bits | |||
| 3 | 2 | 1 | |
| 0 | 0 | 0 | |
| through | possible values for the NAS key set identifier | ||
| 1 | 1 | 0 | |
| 1 | 1 | 1 | no key is available (UE to network); |
| reserved (network to UE) |