name: TTA
full_form: Time To Alert
context: The existing PHY-layer specifications for UE timing advance are defined to be scalable with SCS, i.e. the update granularity becomes more accurate when SCS increases. Overall, for 52.6-71 GHz it is necessary to consider UE timing advance requirements, including UE initial access timing error limit, BS controlled timing advance, UE autonomous timing adjustment requirements, and the aggregated adjustment rate during work item, taking into account the SCS selection. In order to analyze feasibility of new SCS and not to propose specific timing requirements, example simulations were performed. The analysis of the UL timing error sources can be performed by considering the combination of the timing uncertainty due to the timing advance resolution TA_step = , the transmit timing accuracy Te given by Table 7.1.2-1 of 38.133 [98], and the TA command accuracy TTA e defined in Table 7.3.2.2-1 of 38.133 [98]. The requirements for Te and TTA e are not yet specified, but they can be extrapolated
description: Time To Alert (TTA) is a parameter related to the timing advance resolution in the context of UE timing error analysis. It represents the accuracy of the TA command and is an essential factor in determining the overall timing uncertainty.
explanation: The provided text explicitly mentions TTA as part of the analysis for UL timing error sources, alongside other parameters like TA_step and Te. This indicates that TTA is a critical network attribute for operation, making it a Parameter.
section_title: 4.2.2.6UE timing error
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