name: PPM
full_form: Parts Per Million
context: manner as time, TUTRAN-GPS drift rate with its quality shall be reported as well. The usefulness of the non-zero time derivative (drift rate) of TUTRAN-GPS (even after compensating the effect of elapsed time) and SFN-SFN values is the unstability of Node B clocks. In the case of SFN-SFN, its time derivative (or drift rate) is eventually determined by the clock stabilities of Node Bs between which the SFN-SFN is measured. In the case of TUTRAN-GPS, the additional drift rate is coming from the clock stability of the measured Node B. When the Node B clock stability requirement is 0.05 ppm, it means that in the worst case the SFN-SFN value might change with the drift rate 0.1 ppm (one Node B is drifting 0.05 ppm to one direction while the other is drifting 0.05 ppm to another direction). Thus SFN-SFN drift rate might be as high as 30 m/s. For TUTRAN-GPS the worst case is 0.05 ppm drift rate, i.e. 15 m/s. Expected location accuracy of OTDOA-IPDL can be rather high. For example location
description: Parts Per Million (PPM) refers to a unit of measurement used to express the stability and drift rate of clocks in Node Bs, specifically in relation to the SFN-SFN values and TUTRAN-GPS measurements. It quantifies the degree of clock instability, which affects the accuracy of location determination in OTDOA-IPDL.
explanation: The context highlights PPM as a measure of clock stability and drift rate in Node Bs, directly impacting the SFN-SFN values and TUTRAN-GPS measurements. This usage indicates that PPM is a unit of measurement for assessing performance, thus classifying it under the Measurement category.
section_title: 6.2	OTDOA Radio Interface Timing
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