Time slicing operation results are unstable

[Aniwer]

Hardware：Xilinx zedboard + FMCOMMS3

1. By setting both slice_start and slice_end of slice 0 to 0, STA disconnects from openwifi and cannot scan openwifi.(I think queue 0 cannot send out beacon frames and probe response frames in this way, which is in line with expectations.)
2. By operating slice 2 as described in step 1, STA can scan to openwifi, but will be refused association by openwifi.(This is why I don't quite understand)
3. When I operate as described in the documentation https://doc.ilabt.imec.be/ilabt/wilab/tutorials/openwifi.html#sdr-tx-time-slicing, the situation is not stable and sometimes there is no change , sometimes openwifi cannot be scanned

So I have some questions：
Does SDR TX 4 queues correspond to the EDCA mechanism?（The video link in the document seems to be broken）
Does setting slice_start and slice_end to 0 mean closing the tx_queue?