3GPP 24.501 v20.0.0 — the document's own text
9.11.4.10 PDU address
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 PDU address information element is to assign to the UE:
- an IPv4 address associated with a PDU session;
- an interface identifier for the IPv6 link local address associated with the PDU session; or
- an IPv4 address and an interface identifier for the IPv6 link local address, associated with the PDU session.
This purpose of the PDU address information element is also to enable the W-AGF acting on behalf of the FN-RG to provide an interface identifier for the IPv6 link local address associated with the PDU session suggested to be allocated to the FN-RG, and to enable the SMF to provide SMF's IPv6 link local address to the W-AGF acting on behalf of the FN-RG.
The PDU address information element is coded as shown in figure 9.11.4.10.1 and table 9.11.4.10.1.
The PDU address is a type 4 information element with minimum length of 7 octets and a maximum length of 31 octets.
| 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
|---|---|---|---|---|---|---|---|---|
| PDU address IEI | octet 1 | |||||||
| Length of PDU address contents | octet 2 | |||||||
| 0Spare | 0Spare | 0Spare | 0Spare | SI6LLA | PDU session type value | octet 3 | ||
| PDU address information | octet 4octet n | |||||||
| SMF's IPv6 link local address | octet (n+1)*octet (n+16)* |
Figure 9.11.4.10.1: PDU address information element
Table 9.11.4.10.1: PDU address information element
| PDU session type value (octet 3, bits 1 to 3) | ||||
|---|---|---|---|---|
| Bits | ||||
| 3 | 2 | 1 | ||
| 0 | 0 | 1 | IPv4 | |
| 0 | 1 | 0 | IPv6 | |
| 0 | 1 | 1 | IPv4v6 | |
| All other values are reserved. | ||||
| SI6LLA (SMF's IPv6 link local address) bit (octet 3, bit 4) (see NOTE) | ||||
| Bit | ||||
| 4 | ||||
| 0 | SMF's IPv6 link local address field is absent | |||
| 1 | SMF's IPv6 link local address field is present | |||
| Bits 5 to 8 of octet 3 are spare and shall be coded as zero. | ||||
| PDU address information (octet 4 to n) | ||||
| If the PDU session type value indicates IPv4, the PDU address information in octet 4 to octet 7 contains an IPv4 address. | ||||
| If the PDU session type value indicates IPv6, the PDU address information in octet 4 to octet 11 contains an interface identifier for the IPv6 link local address. | ||||
| If the PDU session type value indicates IPv4v6, the PDU address information in octet 4 to octet 11 contains an interface identifier for the IPv6 link local address and in octet 12 to octet 15 contains an IPv4 address. | ||||
| SMF's IPv6 link local address (octet n+1 to n+16) | ||||
| SMF's IPv6 link local address field contains SMF's IPv6 link local address. | ||||
| NOTE: In the UE to network direction, the SI6LLA bit shall be set to "SMF's IPv6 link local address field is absent". |