Figure 12 shows the backoff stage transition at each propagation delay in the rage of 1–50 μs.
In the case of δ=1 μs, there are no imbalance data frame transmissions between two STAs. However, in the cases of δ=30 and 50 μs, there are many imbalance data frame transmissions during a short period.
The simulation results obtained under this “shortterm unfairness” for δ= 50 μs are shown in Fig.13.
The figure shows that the data frame transmission from STA B is dominant because of the short-term unfairness during this period.
When the value of the backoff stage of STA A remains large, the value of the backoff stage of STA B occasionally remains small.
In such situations, STA B for which the backoff