name: HMI
full_form: Human Machine Interface
context: within the AL. To properly monitor for integrity in the positioning system, both the fault and fault-free conditions which potentially lead to MI or HMI need to be characterized for the network and the UE. Figure 9.1.1.4-A illustrates the concept of MI and HMI with respect to the KPIs, PL and PE. Figure 9.1.1.4-A: Relationship between Positioning Error (PE), Protection Level (PL), Alert Limit (AL), MI and HMI [32]. A useful representation for interpreting the relationship between the positioning integrity KPIs and PL is the so-called Stanford Diagram [33] in Figure 9.1.1.4-B. It should be noted that the Positioning Error (PE) in this diagram is the difference between the true position and the estimated position, computed by the positioning device. In practice, the true position is not known. Figure 9.1.1.4-B: Stanford Diagram for integrity events, adapted from [33][34]. Important observations can be made from Figure 9.1.1.4-B in the context of this study: 1. The conditions represented
description: Human Machine Interface (HMI) refers to the interaction between humans and machines, particularly in the context of monitoring and characterizing fault and fault-free conditions that lead to Misleading Information (MI) or Hazardously Misleading Information (HMI) in positioning systems.
explanation: The provided context from 3GPP TS 38.857 discusses HMI in relation to positioning system integrity, KPIs, and protection levels. Given the focus on human interaction with machines for monitoring and characterization purposes, HMI is best classified under Miscellaneous as it does not fit neatly into other categories like Network Function or Protocol.
section_title: 9.1.1.4Relationship between the PL and KPIs
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