Section: 5.4.1 GUTI reallocation procedure 5.4.1.1 General
Content: The purpose of the GUTI reallocation procedure is to allocate a GUTI and optionally to provide one or more of the following to a particular UE: - a new TAI list; - a new DCN-ID; and - in WB-S1 mode, if the UE supports RACS, either a UE radio capability ID deletion indication or a UE radio capability ID. The reallocation of a GUTI is performed by the unique procedure defined in this clause. This procedure can only be initiated by the MME in state EMM-REGISTERED. The GUTI can also be implicitly reallocated at attach or tracking area updating procedures. The implicit reallocation of a GUTI is described in the clauses which specify these procedures (see clause 5.5.1 and 5.5.3). The PLMN identity in the GUTI indicates the current registered PLMN. NOTE 1: The GUTI reallocation procedure is usually performed in ciphered mode. NOTE 2: Normally, the GUTI reallocation will take place in conjunction with another mobility management procedure, e.g. as part of tracking area updating.