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gfps: 添加认证测试和FAQ 20260505
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Change-Id: I71e676b997159a141ca07d16f82a73b45f4b2410
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danni_dong
2026-05-05 19:24:08 +08:00
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# 4.1 Observed standard deviation is too low, ........
<span class="jira-issue resolved" jira-key="BB2BUG-17449"> <a href="https://jira.realtek.com/browse/BB2BUG-17449" class="jira-issue-key"><img src="https://jira.realtek.com/secure/viewavatar?size=xsmall&amp;avatarId=10916&amp;avatarType=issuetype" />BB2BUG-17449</a> - <span class="summary">\[BB2\]\[RTL8763EF/ROM\]\[GMI\]\[沃莱特\]\[Harman\]\[T520\]: Finder测项中，finder_advertisement rotation测试失败</span> <span class="aui-lozenge aui-lozenge-subtle aui-lozenge-success jira-macro-single-issue-export-pdf">Closed</span> </span>
Hi Avner:
We test advertising rotation failed, could you help see the reason, thanks
![](images/4.1+Observed+standard+deviation+is+too+low,+........_113ce3ab.jpg)
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Hi Danni,\
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The reason that this test fails is that the device under test rotates EID/MAC pretty much precisely every 1024 seconds (standard deviation is 0.83 seconds).\
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Per spec the exact rotation time should be randomized, please refer to the "ID Rotation" section.
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Hi Mark:
![](images/4.1+Observed+standard+deviation+is+too+low,+........_9e367358.jpg)
1.Does the positive randomized time factor have a value range? Can you provide some reference ranges?
2.Is the standard deviation must be greater than 0.83?
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<a href="mailto:dlazarov@google.com" class="external-link" rel="nofollow">+David Lazarov</a> Can you please attach the latest version of the spec which includes the recommended randomization values?
 
Hi Danni,
 
1. The recommended size of the randomization window is 20% of the interval, i.e. 204 seconds. So when the device needs to compute the next time point to rotate EID/MAC, it's going to be *floor((last_rotation_time_seconds + 1024) / 1024) \* 1024 + random(0, 204). *
2. *Standard deviation of 0.83 seconds practically means there's no randomization. We expect standard deviation to be much higher, typically 50-60 seconds, or more.*
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