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Change-Id: I71e676b997159a141ca07d16f82a73b45f4b2410
1.8 KiB
1.8 KiB
Reason：Observed standard deviation is too low, ........
BB2BUG-17453 - [BB2][RTL8763EF/ROM][GMI][沃莱特][Harman][T520]: Finder测项中，finder_unwanted tracking protection测试失败 Closed
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Hi Danni,
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).
Per spec the exact rotation time should be randomized, please refer to the "ID Rotation" section.
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Hi Mark:
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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+David Lazarov Can you please attach the latest version of the spec which includes the recommended randomization values?
Hi Danni,
- 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). *
- 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.