Yes, I've read their research when it was published and I view it as influential results. Their approach jointly optimizes transmit rate and power for each and every frame (i.e., for each link and each direction every time). However, we are talking about much lower hanging fruit if all you want is an attic mounted access point that tries not to interfere too much with the neighbors while still dealing with blind spots within the house. I still think that the periodic global adjustment method also used by Cisco should be legal and very easy to implement on OpenWrt. On Fri, Jan 26, 2024 at 11:46 AM Petko Bordjukov <bordjukov@xxxxxxxxx> wrote: > > Hi, > > The only project I've heard of that implements such functionality is > https://github.com/thuehn/Minstrel-Blues. > > On Thu, Jan 4, 2024 at 12:02 PM <b.K.il.h.u+tigbuh@xxxxxxxxx> wrote: > > > > Ideally, TPC should be a fully automatic mechanism that reduces > > transmit power between the two points to as low of a level as possible > > while delivering the same quality of service. The purpose is to reduce > > the excess headroom in each link. I.e., if you could still link with > > 65Mb/s towards a given direction using 14dBmW, you should not transmit > > with 20dBmW. > > > > Some only set the AP TX power globally (i.e., same towards all of its > > connected clients at the moment) to tackle the hidden/exposed node > > problem, but again must do this adaptively and change this constantly > > without human intervention. There exist multiple advanced algorithms > > for this, some proprietary tuned for corporate deployment. > > > > Actually, if we accepted automatically retuning tx power with iw based > > on actual link stats of momentarily connected clients every 60s with > > cron, this could be added to OpenWrt pretty easily. > > > > > Class A devices control their transmit power within ±3 dB and class B devices control their power within ±9 dB. > > > > - https://www.litepoint.com/blog/wi-fi-6-ofdma/ > > - https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-3/b_RRM_White_Paper/tpc.html > > > > > On Thu, 2024-01-04 at 10:07 +0100, b.K.il.h.u+tigbuh@xxxxxxxxx wrote: > > > > You can find a wording in most such regulations that if TPC is not > > > > supported, the maximal TX power must be reduced by 3 dBmW. Hence in > > > > all such cases, the entries in db.txt contain 3 less than the maximum. > > > > > > > > If, on the other hand, you know of a country that specifies that > > > > devices lacking TPC may not use the band at all, all such band entries > > > > must be omitted (commented out along with a URL).
