School of Specs 24.501v20.0.0

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

9.11.3.97 Alternative 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 Alternative NSSAI information element is to identify a list of mapping information between the S-NSSAI to be replaced and the alternative S-NSSAI.

The Alternative NSSAI information element is coded as shown in figure 9.11.3.97.1, figure 9.11.3.97.2 and table 9.11.3.97.1.

The Alternative NSSAI is a type 4 information element with minimum length of 2 octets and maximum length of 146 octets.

87654321
Alternative NSSAI IEIoctet 1
Length of Alternative NSSAI contentsoctet 2
Entry 1octet 3*octet a*
Entry 2octet a+1*octet b*
…octet b+1*octet c*
Entry noctet c+1*octet d*

Figure 9.11.3.97.1: Alternative NSSAI information element

87654321
S-NSSAI to be replacedoctet 3octet x
Alternative S-NSSAIoctet x+1octet a

Figure 9.11.3.97.2: Entry

Table 9.11.3.97.1: Alternative NSSAI information element

Value part of the Alternative NSSAI information element (octet 3 to d)The value part of the Alternative NSSAI information element consists of one or more entries, each entry consists of one S-NSSAI to be replaced and one alternative S-NSSAI. The number of entries shall not exceed eight.S-NSSAI to be replaced (octet 3 to x) (see NOTE)S-NSSAI to be replaced 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.
Alternative S-NSSAI (octet x+1 to a)
Alternative S-NSSAI 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: The S-NSSAI to be replaced shall be one S-NSSAI included in the allowed NSSAI or partially allowed NSSAI.