name: TTFF
full_form: Time To First Fix
context: Sources in TS 22.261 [3] copied from TS 22.261 [3] Clause 7.3.2.2: The 5G system shall be able to provide positioning services with the performance requirements reported in Table 7.3.2.2-1. NOTE: The requirements do not preclude any type of UE, including specific UE such as for example V2X, MTC. Table 7.3.2.2-1 Performance requirements for Horizontal and Vertical positioning service levels The 5G system shall be able to provide the 5G positioning services with a TTFF less than 30 s and, for some 5G positioning services, shall support mechanisms to provide a TTFF less than 10 s.NOTE 1: In some services, a TTFF of less than 10s may only be achievable at the expense of a relaxation of some other performances (e.g. horizontal accuracy may be 1 m or 3 m after 10 s TTFF, and reach a steady state accuracy of 0,3 m after 30 s). The 5G system shall support a mechanism to determine the UE's velocity with a positioning service availability of 99%, an accuracy better than 0,5 m/s for the speed and
description: Time To First Fix (TTFF) measures the time taken by a 5G system to provide its first positioning fix. It is crucial for evaluating the performance of positioning services, especially in applications needing rapid location fixes like V2X and public safety.
explanation: TTFF is classified as a Performance Metric because it quantifies the speed and efficiency of the 5G system's positioning capabilities. Its value directly impacts the responsiveness and usability of location-based services.
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