> Right, but if you enter dynamic SM PS then it doesn't matter much > anyway, does it? I mean, there's no protection requirement in that > case, is there? Or am I reading it wrong? I _think_ I will handle the > SM PS change in mac80211, but I'm not entirely sure right now. > > Johannes Well, upon a more careful reading of 11.2.3, the second paragraph would seem to indicate that some kind of protection/wake-up is required prior to a multi-spatial stream transmission, if the receiver is in dynamic SM power save mode. The 'protection' frame that is received, is received by a single RX chain. It is suggested to use an RTS/CTS. The other RX chains are powered-on after the RTS is received. You could use an RTS/CTS, as suggested. I suspect there are more efficient ways to kickoff the TXOP, and the 4th paragraph suggests that any frame with matching RA will wake up all the RX chains for the duration of the TXOP. That is probably the way to go, assuming you can. If the STA is in static power save, it simply cannot receive 2+ spatial stream MCS's, until it exits that mode. So, I guess, yes, it does matter after all. Nils -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
