Hello, unless i'm wrong, it seems that those questions about 5GHz band in EU (in general) ad in France (in particular) have not received "official" answer. Best regards, Mathieu Le 13/09/2017 ? 15:55, Maximilian Engelhardt a ?crit?: > Hi, > > I sent the patch to add the Frequency range from 5725 to 5875 MHz in Germany > so I can give you some background on this. > What I'm writing is only valid for Germany, but since it's all based on > European regulations it's probably very similar in other European countries. > > In Germany there are three bands allowed for wireless LAN (WLAN) usage in the > 5 GHz band [1]: > > 5150 - 5250 MHz (indoor only) > 5250 - 5350 MHz (indoor only) > 5470 - 5725 MHz (indoor and outdoor) > > However the 5470 - 5725 MHz band is only allowed for fixed outdoor > installations (this is not stated directly in the legal document but I have > been told it's interpreted in this way. It's however explicitly stated that > usage for aircraft communication is not allowed). So for for non-fixed outdoor > setups none of these 5 GHz bands can be used. > > > Additionally to the official wireless LAN bands there are short range devices > (SRD) bands. These are similar to the ISM bands and often share the same > frequency and power regulations, but unlike the ISM bands which are only > allowed for industrial, scientific or medical applications the SRD bands can be > used for data communication. > There exists a frequency range from 5725 - 5875 MHz as SRD band (also an ISM > band) with a maximum power of 25 mW [2]. While this is not specifically > regulated for wireless LAN usage, is can be legally transmitted in this band > following the power restriction. There are also no restrictions to indoor or > outdoor usage. So this is the only 5GHz band in Germany that can be legally > used for non-fixed outdoor equipment using wireless LAN. > Power on this band is limited but there may be applications where this is not > a problem, e.g. if you have line of sight communication or don't need to > transfer much data. > > Because of this I see no reason why this frequency range should be removed > from the database. It has advantages over the other 5 GHz bands and it can be > legally used. I would find it annoying not being able to use it while I'm > legally allowed to and not having another option available. > > Regards, > Maxi > > [1] https://www.bundesnetzagentur.de/SharedDocs/Downloads/DE/Sachgebiete/ > Telekommunikation/Unternehmen_Institutionen/Frequenzen/Allgemeinzuteilungen/ > 2010_07_WLAN_5GHz_pdf.pdf > [2] https://www.bundesnetzagentur.de/SharedDocs/Downloads/DE/Sachgebiete/ > Telekommunikation/Unternehmen_Institutionen/Frequenzen/Allgemeinzuteilungen/ > 2014_69_SRD_pdf.pdf > > On Freitag, 8. September 2017 00:15:34 CEST Ryan Mounce wrote: >> On 7 September 2017 at 23:33, Mathieu Peyr?ga <mathieu.peyrega at gmail.com> > wrote: >>> Hello, >>> >>> unfortunately, my wifi skills are not (yet ?) allowing me to track further >>> than what the "iw reg get" command tells me (confirmed by some off the >>> shelf Wifi analyzer sofwares). >>> Do you have pointers/tutorial to help me doing that ? >> Try this >> >> # find interface name >> iw dev >> # perform scan on interface >> iw dev wlan0 scan -u >> >> This previously dumped the country IE in a nice readable form, however >> it no longer does on my device running LEDE master so you may not have >> any luck depending on how new your distro is. >> >> Typically for this task I would use monitor mode + Wireshark or my >> favoured (sadly proprietary) WiFi surveying app, however I can only >> provide advise for macOS. >> >>> Further reading your answer, my guess is that DJI has complied to UNII-3 >>> choice. At least on their website Spark spec page, they clearly give the >>> good max power figures and make the difference between FCC and EU areas. >>> >>> This leads to my concern about why not adding the matching rules in the DB >>> for EU countries that have transposed it into their laws. >>> Is this regulatory DB supposed to strictly reflect the current state of >>> local regulations or doe it also endorse a higher level of >>> "responsability" >>> in order to prevent issues with non complient devices as I understand your >>> fears ? >> The regdb is only used in practice for 802.11 rather than as a >> universal dictionary for radio regulations. My personal opinion is >> that it should first reflect local regulations, and then subsequently >> reflect established industry conventions that are more restrictive. In >> this instance, the industry convention appears to be disabling the >> UNII-3 range in Europe and I happen to agree more for practical >> reasons than any sense of 'responsibility'. >> >>> Regards >>> >>> Le 07/09/2017 ? 15:44, Ryan Mounce a ?crit : >>>> You can see the 'FR' Country Code, can you see the full 802.11d >>>> Country Information IE that is broadcast by the DJI drone? >>>> >>>> I can see how this situation has come about. In much of the world >>>> including China (DJI) and the USA (DJI's largest international market) >>>> the 'UNII-3' equivalent range is a simple default choice with high >>>> power and outdoor use permitted, with no DFS to worry about. >>>> >>>> Europe is not so simple. In roughly descending order of device >>>> compatibility. >>>> >>>> 2.4GHz has power restrictions compared to USA/China, and is polluted >>>> in every country. >>>> UNII-1 is indoor only and should require the user to confirm they are >>>> indoors (for a device like a drone that is likely to be used outdoors, >>>> unlike a home WiFi AP) >>>> UNII-2 adds DFS and TPC restrictions to UNII-1, quite restrictive. >>>> UNII-2E is fairly quiet and allows more generous power, however DFS is >>>> still a consideration and a portable device like a drone would have to >>>> scan for at least 60 seconds before broadcasting in this band. >>>> UNII-3 has the strictest power restrictions of all, and thus the most >>>> limited range. >>>> >>>> So it seems that DJI have simply ignored this altogether, and are >>>> broadcasting in a poorly supported frequency band in Europe with >>>> either a very weak short range signal or a very strong signal in >>>> violation of regulations. Either way, this is very much their problem >>>> (and unfortunately also their customers'). >>> -- >>> tel : +33 (0)6 87 30 83 59 >> _______________________________________________ >> wireless-regdb mailing list >> wireless-regdb at lists.infradead.org >> http://lists.infradead.org/mailman/listinfo/wireless-regdb
