Section: 16.4.7.1 Presence of the 3GPP Vendor-Specific attribute in RADIUS messages.
Content: Table 7: List of the 3GPP Vendor-Specific sub-attributes The information represented by some of the Sgi sub-attributes may not be available to the P-GW depending on the UE’s radio access and the S5/S8 protocol type (GTP or PMIP). For example, the P-GW will be aware of the User Location Info (e.g. TAI) if the user is in LTE access and GTP based S5/S8 is used. However, such information is not passed to the P-GW when PMIP based S5/S8 is utilised. In such scenarios, if a sub-attribute is configured in the P-GW to be transferred to the RADIUS AAA server, but the information in the P-GW is not up to date or not available; the P-GW shall not send the corresponding sub-attribute, unless otherwise stated in the following subclause where the encoding of each sub-attribute is specified.