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

9.11.3.37 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 NSSAI information element is to identify a collection of S-NSSAIs

The NSSAI information element is coded as shown in figure 9.11.3.37.1 and table 9.11.3.37.1.

The NSSAI is a type 4 information element with a minimum length of 4 octets and a maximum length of 146 octets.

NOTE: More than one S-NSSAIs in an NSSAI can have the same SST values, and optionally same SD values, which are associated with different mapped HPLMN SST values and optionally mapped HPLMN SD values.

8	7	6	5	4	3	2	1
NSSAI IEI	octet 1
Length of NSSAI contents	octet 2
S-NSSAI value 1	octet 3octet m
S-NSSAI value 2	octet m+1octet n
…	octet n+1octet u
S-NSSAI value n	octet u+1octet v

Figure 9.11.3.37.1: NSSAI information element

Table 9.11.3.37.1: NSSAI information element

Value part of the NSSAI information element (octet 3 to v)The value part of the NSSAI information element consists of one or more S-NSSAI values. Each S-NSSAI value consists of one S-NSSAI and optionally one mapped S-NSSAI.The recipient of this information element shall store the complete list received (NOTE 1, NOTE 2, NOTE 3). If the NSSAI information element conveys an allowed NSSAI and more than 8 S-NSSAI values are included in this information element, the UE shall store the first 8 S-NSSAI values and ignore the remaining octets of the information element.If the NSSAI information element conveys a configured NSSAI (including the default configured NSSAI) or pending NSSAI and more than 16 S-NSSAI values are included in this information element, the UE shall store the first 16 S-NSSAI values and ignore the remaining octets of the information element.S-NSSAI value:S-NSSAI value is coded as the length and value part of S-NSSAI information element as specified in clause 9.11.2.8 starting with the second octet.
NOTE 1: The total number of S-NSSAI values in a requested NSSAI shall not exceed eight.NOTE 2: The number of S-NSSAI values in an allowed NSSAI shall not exceed eight.NOTE 3: The number of S-NSSAI values in a configured NSSAI (including the default configured NSSAI) or pending NSSAI shall not exceed sixteen.

Value part of the NSSAI information element (octet 3 to v)The value part of the NSSAI information element consists of one or more S-NSSAI values. Each S-NSSAI value consists of one S-NSSAI and optionally one mapped S-NSSAI.The recipient of this information element shall store the complete list received (NOTE 1, NOTE 2, NOTE 3). If the NSSAI information element conveys an allowed NSSAI and more than 8 S-NSSAI values are included in this information element, the UE shall store the first 8 S-NSSAI values and ignore the remaining octets of the information element.If the NSSAI information element conveys a configured NSSAI (including the default configured NSSAI) or pending NSSAI and more than 16 S-NSSAI values are included in this information element, the UE shall store the first 16 S-NSSAI values and ignore the remaining octets of the information element.S-NSSAI value:S-NSSAI value is coded as the length and value part of S-NSSAI information element as specified in clause 9.11.2.8 starting with the second octet.

NOTE 1: The total number of S-NSSAI values in a requested NSSAI shall not exceed eight.NOTE 2: The number of S-NSSAI values in an allowed NSSAI shall not exceed eight.NOTE 3: The number of S-NSSAI values in a configured NSSAI (including the default configured NSSAI) or pending NSSAI shall not exceed sixteen.