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

9.11.3.103 Partial 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 Partial NSSAI information element is to deliver one or more S-NSSAIs in a set of tracking areas of a registration area from the network to the UE.

The Partial NSSAI information element is coded as shown in figure 9.11.3.103.1, and table 9.11.3.103.1.

The Partial NSSAI information element is a type 6 information element, with a minimum length of 3 octets and a maximum length of 808 octets.

8	7	6	5	4	3	2	1
Partial NSSAI IEI	octet 1
Length of partial NSSAI contents	octet 2
	octet 3
S-NSSAI value1	octet 4octet i
Partial tracking area identity list 1	octet (i+1)octet j
…	octet (j+1)octet l
S-NSSAI value n	octet (l+1)octet k
Partial tracking area identity list n	octet (k+1)octet m

Figure 9.11.3.103.1: Partial NSSAI information element

Table 9.11.3.103.1: Partial NSSAI information element

S-NSSAI value (octet 4 to i) (NOTE 1)
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.

Partial tracking area identity list (octet i+1 to j)
The partial tracking area identity list field is coded as the length and value part of the 5GS tracking area identity list IE defined in clause 9.11.3.9 starting with the second octet (NOTE 2).

NOTE 1: The maximum number of S-NSSAIs included in this information element is 7.NOTE 2: A registration area contains maximum 16 different tracking areas, therefore the partial tracking area identity list can contain at the most 15 tracking area identities.NOTE 3: The AMF shall set the Length of partial NSSAI contents to 0 if there are no S-NSSAIs to deliver in a set of tracking areas of a registration area and, the UE shall delete any existing stored partially allowed NSSAI for the current registration area or partially rejected NSSAI for the current registration area.