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Federal Register / Vol. 86, No. 143 / Thursday, July 29, 2021 / Notices
Testers should, however, attempt to conduct a mobile test within a single grid cell as much as is reasonably and safely possible. A mobile test should initiate when moving away from the location of a stationary test after having reached the speed of the surrounding traffic, or a safe and reasonable operating speed in the event no traffic is present.
F. Statistical Analysis of Testing Results Upon receipt of drive testing submissions, the Bureau will perform a statistical analysis of the data to
estimate the desired total population covered. Because the sample is selected using stratified random sampling, estimation techniques appropriate for this particular sampling method must be used.
Stratified random sampling requires an aggregate measurement from a sampled grid cell that will be combined with measurements from the other sampled grid cells to calculate stratumlevel estimates of total covered population. These estimates will, in turn, be combined to produce an overall estimate of covered population. Drive
tests conducted in a sample grid cell will be aggregated based on the following rule:
Let p be the percentage of drive tests that meet or exceed the applicable minimum.2 If p is at least 85%, then the full population of the sample grid cell will be deemed as covered; otherwise, 0% will be deemed as covered.
To calculate the stratum-level estimates and the overall estimate of the covered population, the Bureau proposes to use the estimation method appropriate for stratified random sampling, described next.

Let xh,i be the deemed covered population in the ith grid cell of stratum h, where i on the rule above, xh,i
= 1, , nh.

Based
= Xh,i if p 0.85, and xh,i = 0 if p < 0.85. The stratum sample mean covered
population, :ih, is calculated as :ih
= L=. xh,i fnh; the stratum sample total covered population is
Combining these stratum-level estimates, we arrive at the overall covered population mean, :i, calculated as:

2 For 2G tests, the applicable minimum speeds would be 22.8 kbps for both download and upload tests, as this is the minimum equivalent data rate
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Finally, the overall covered , is estimated as population total, X

X = Nx.
G. Adjudication of the Outcome of the Testing Process Because the estimate of the total comes from a covered population X
against sample, direct comparison of X
the committed covered population is not appropriate. Instead, staff proposes to construct a confidence interval that takes into account the variability arising from the estimate X, and use this for voice service, accounting for the voice codec rate and channel coding rate requirements. See
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confidence interval to adjudicate the outcome of the testing process.
Because the Alaska Plan calls for a tiered approach in levying penalties for providers failing the testing process, the Bureau proposes to use a one-sided 90%
confidence interval for X to quantify the gap in coverage. In particular, the Bureau proposes to use the upper limit of this confidence interval, which is calculated as
X + 1.28NV:i.
ETSI, CODECs, https www.etsi.org/technologies/
codecs last visited July 14, 2021.

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EN29JY21.005

To more accurately reflect coverage at the time of deployment and to fulfill the Alaska Plans requirement to evaluate a providers commitments based on December 2021 Form 477 coverage data, we propose to adjust the covered population of the sample frames Nh relative to covered population according to the December 2020 Form 477 data.
For frames where coverage would be reduced, we would proportionally reduce population, and, for where coverage would increase, we would proportionally increase population.

EN29JY21.004

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with variance: