A-MPDU frame aggregation simulation

[ken shung]

I am trying simulations using the A-MPDU.
When I increased the MPDU size in one AP and one terminal situation, I got
the expected result.
However, when two APs and terminals were installed and simulation didn't
show the expected result.
The total throughput was reduced by about 15 Mbps.
Since we are sending data from the terminal to the AP and there are only
two flows in total, I do not think that there was a collision.

I think that the same result (throughput) as the first situation is
expected。
Are there any factors that I missed?

First situation

ap
|
te


-----------------------------------------------------------

Second situation

ap ap
| |
te te