name: TAC
full_form: Type Allocation Code
context: satellite beam. UE listens to TAI = PLMN ID + TAC and determines to trigger registration area update procedure based on the broadcast TAC and PLMN ID when it moves out of the registration area. This approach allows to use Rel-15 NR network procedures and can be applied to UE with or without location information. Two possible options should be studied to update the broadcast TAC: "hard switch" option: one cell broadcast only one TAC per PLMN. The new TAC replaces the old TAC and there may be some fluctuation at the border area. As shown in Figure 7.3.1.3.1-2, the UE will see its TAC changing like TAC-2-> TAC-1-> TAC-2 from T1 to T3. Figure 7.3.1.3.1-2: TAC fluctuation at the border area "soft switch" option: one cell can broadcast more than one TACs per PLMN. The cell adds the new TAC in its system information in addition to the old and removes the old a bit later. If there is a chain of TAs, the TA list adds one TA more and removes one old while the cell sweeps the ground. This also
description: Type Allocation Code (TAC) is a critical network attribute used in the context of UE location information and registration area updates in 5G networks. It is broadcast by cells and used by User Equipment (UEs) to determine when to trigger registration area update procedures.
explanation: The text describes TAC as a code broadcast by cells and used by UEs for registration area updates, clearly defining it as a network parameter.
section_title: 7.3.1.3.1Approach 1: For the case when UE location information is unavailable
biotag_Context: O,O,B-Device,O,O,B-Parameter,O,B-Parameter,I-Parameter,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,B-Parameter,I-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network,O,O,O,O,O,O,O,B-Device,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,B-Parameter,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O
biotag_Description: B-Parameter,I-Parameter,I-Parameter,O,O,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,O,O,O,O,B-Technology,O,O,O,O,O,O,O,O,O,B-Device,I-Device,O,O,O,O,O,O,O,O,O,O