name: HDOP
full_form: Horizontal Dilution Of Precision
context: Table 15.7 shows the simulation assumptions of this simulation. Another assumptions are defined as follows: - 9 diferent Transport Format Combinations (table 15.8) are informed during the call set up procedure, so that UE have to detect correct transport format from this 9 candidates; - reference measurement channels defined in annex A.4 of TS 25.101 [1] are used in this simulation. Moreover, it is pointed out that "Even if CRC check result is O.K., UE might detect false Transport Format", and proposed to regard this case as Block Error. It is obvious that the fault detection of transport format causes significant degradation to the service quality (e.g. AMR speech glitch). Therefore it should be evaluate the probability of these cases independently. In order to evaluate it, both BLER and FDR (False Transport Format Detection Ratio) are defined and evaluated in this simulation. The definitions of BLER and FDR are as follows: - BLER: the probability of CRC check result is N.G; - FDR:
description: The Horizontal Dilution Of Precision (HDOP) is a measure used in satellite navigation to quantify the effect of satellite geometry on the precision of horizontal position estimates. In the context of 3GPP TS 25.171, HDOP is calculated using a sub-set of satellites that are above 15 degrees elevation with respect to the User Equipment (UE), and is used as a parameter to evaluate the performance of satellite-based positioning systems.
explanation: HDOP is classified as a Measurement because it is a quantifiable metric used to assess the precision of horizontal position estimates in satellite navigation. The context highlights its calculation using a sub-set of satellites and its use as a parameter to evaluate system performance, which aligns with the definition of a measurement.
section_title: B.1.5	Satellite constellation and assistance data
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