TS 33.128 CR0237 - Fixing TAC Length (R16)
The Identity Association schema in Annex E defines a TAC as four hexadecimal digits (two octets). This is consistent with an E-UTRAN TAC, but 5G allows an additional octet (see TS 38.413 clause 9.3.3.10). This change extends the TAC definition to permit 6 hexadecimal digits, as well as the existing 4.