Section: 5.3.7 GUTI Reallocation procedure
Content: The MME may initiate the GUTI Reallocation procedure to reallocate the GUTI and/or TAI list at any time when a signalling association is established between UE and MME. The GUTI Reallocation procedure allocates a new GUTI and/or a new TAI list and/or PLMN-assigned UE Radio Capability ID to the UE. The GUTI and/or the TAI list may also be reallocated by the Attach or the Tracking Area Update procedures. When the UE supports RACS, and the MME needs to configure the UE with a UE Radio Capability ID, and the MME already has the UE radio capabilities for the UE, the MME may initiate the GUTI Reallocation procedure to provide the UE with the UE Radio Capability ID for the UE radio capabilities the UCMF returns to the MME for this UE. When the UE supports RACS, and the MME needs to delete any previously assigned PLMN-assigned UE Radio Capability ID(s) for the UE, the MME may initiate the GUTI Reallocation procedure to signal a PLMN-assigned UE Radio Capability ID deletion indication. If the UE receives PLMN-assigned UE Radio Capability ID deletion indication, the UE shall delete any PLMN-assigned UE Radio Capability ID(s) for this PLMN. The GUTI Reallocation procedure is illustrated in Figure 5.3.7-1. Figure 5.3.7-1: GUTI Reallocation Procedure 1. The MME sends GUTI Reallocation Command (GUTI, TAI list, PLMN-assigned UE Radio Capability ID, PLMN-assigned UE Radio Capability ID deletion indication) to the UE. 2. The UE returns GUTI Reallocation Complete message to the MME.