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strange MPDU loss pattern

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Hello,

We study the effects of 802.11n frame aggregation on throughput. We noticed a strange pattern in the MPDU loss within an aggregated frame. It seems that the second half of the MPDUs (those with higher sequence numbers) in an aggregated frame are more likely to be lost. Is this a known fact or is there any explanation for it?

For example if 32 frames are aggregated with sequence numbers 100 to 131.
Frames with sequence numbers 100-115 are more likely to be received correctly
than 116-131.


Best,
Ali
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