<p dir="ltr"><br>
On 7 Jan 2013 09:35, "Michael Richardson" <<a href="mailto:mcr@sandelman.ca">mcr@sandelman.ca</a>> wrote:<br>
><br>
><br>
> I asked<br>
> > A comment was made a month ago or so about how long it takes wifi APs<br>
> > to switch from transmitting (unicast) to one station to another. That<br>
> > there was quite a large latency here, and that this was one reason that<br>
> > the AP designers wanted large buffers to accmulate, so that the<br>
> > switching time could be amortized over a larger number of packets.<br>
><br>
> Pedro Tumusok <<a href="mailto:pedro.tumusok@gmail.com">pedro.tumusok@gmail.com</a>> replied<br>
> > I might be way of here, but to me this sounds like a-mpdu which is<br>
> > used to aggregate frames to get higher throughput. Thats in the<br>
> > specification, its<br>
> > in 802.11ac and I believe that it go introduced with 802.11n.<br>
> ><br>
> > It is there to mitigate the overhead of aquiring the channel.<br>
><br>
> Does this mean that 802.11a,b do not suffer from this problem?<br>
><br>
<br>
They do not have that feature, but I assume they would still be bloated in other places for other reasons.</p>
<p dir="ltr">The a-mpdu got tweaked a bit in ac, to always use it. Even for single frames. Not only for aggregate as in n.<br></p>