School of Specs 24.501v20.0.0

3GPP 24.501 v20.0.0 — the document's own text

9.11.3.31B Mapped NSSAI

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 Mapped NSSAI information element is to transfer S-NSSAI(s) applicable in the HPLMN to the visited PLMN.

The Mapped NSSAI information element is coded as shown in figure 9.11.3.31B.1, figure 9.11.3.31B.2 and table 9.11.3.31B.1.

The Mapped NSSAI is a type 4 information element with a minimum length of 4 octets and a maximum length of 42 octets.

NOTE 1: The total number of S-NSSAI values in a requested mapped NSSAI cannot exceed eight.

87654321
Mapped NSSAI IEIoctet 1
Length of Mapped NSSAI contentsoctet 2
Mapped S-NSSAI content 1octet 3octet m
Mapped S-NSSAI content 2octet m+1*octet n*
…octet n+1*octet u*
Mapped S-NSSAI content noctet u+1*octet v*

Figure 9.11.3.31B.1: Mapped NSSAI information element

87654321
Length of Mapped S-NSSAI contentoctet 3
Mapped HPLMN SSToctet 4
Mapped HPLMN SDoctet 5*octet 7*

Figure 9.11.3.31B.2: Mapped S-NSSAI content

Table 9.11.3.31B.1: Mapped NSSAI information element

Value part of the Mapped NSSAI information element (octet 3 to v)The value part of the Mapped NSSAI information element consists of one or more mapped S-NSSAI contents.Mapped S-NSSAI content:Length of S-NSSAI contents (octet 3)Mapped HPLMN Slice/service type (SST) (octet 4)This field contains the 8 bit SST value of an S-NSSAI in the S-NSSAI(s) of the HPLMN to which the SST value is mapped. The coding of the SST value part is defined in 3GPP TS 23.003 [4].NOTE 1: Octet 4 (i.e. mapped HPLMN SST) shall always be included.Mapped HPLMN Slice differentiator (SD) (octet 5 to octet 7)This field contains a 24-bit SD value of an S-NSSAI in the S-NSSAI(s) of the HPLMN to which the SD value is mapped. The coding of the SD value part is defined in 3GPP TS 23.003 [4].NOTE 2: If the octet 5 is included, then octet 6 and octet 7 shall be included.