School of Specs 24.501v20.0.0

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

9.11.3.30 LADN information

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 LADN information information element is to provide the UE with the LADN service area for each available LADN in the current registration area or to delete the LADN information at the UE.

The LADN information information element is coded as shown in figure 9.11.3.30.1, figure 9.11.3.30.2 and table 9.11.3.30.1.

The LADN information is a type 6 information element with a minimum length of 3 octets and a maximum length of 1715 octets.

The LADN information information element can contain a minimum of 0 and a maximum of 8 different LADNs each including a DNN and a 5GS tracking area identity list.

87654321
LADN information IEIoctet 1
Length of LADN information contentsoctet 2octet 3
LADN 1octet 4octet a
LADN 2octet a+1*octet b*
…octet b+1*octet g*
LADN noctet g+1*octet h*

Figure 9.11.3.30.1: LADN information information element

87654321
Length of DNN valueoctet 4
DNN valueoctet 5octet m
5GS tracking area identity listoctet m+1octet a

Figure 9.11.3.30.2: LADN

Table 9.11.3.30.1: LADN information information element

Value part of the LADN information information element (octet 4 to octet h)The value part of the LADN information information element consists of one or several LADNs. Each LADN (e.g. octet 4 to octet a) consists one DNN value and one 5GS tracking area identity list. The length of each LADN is determined by the length of DNN value field and the length of 5GS tracking area identity list field.The UE shall store the complete list as received. If more than 8 LADNs are included in this information element, the UE shall store the first 8 LADNs and ignore the remaining octets of the information element.DNN value (octet 5 to octet m):DNN value field is coded as DNN value part of DNN information element as specified in clause 9.11.2.1B starting with the third octet.
5GS tracking area identity list (octet m+1 to octet a):
5GS tracking area identity list field is coded as the length and the value part of the 5GS Tracking area identity list information element as specified in clause 9.11.3.9 starting with the second octet.