Five Facts About 6 GHz Wi-Fi


Two pieces of important news hit the wire recently: the 6 GHz band was approved for Wi-Fi, and alcohol sales have skyrocketed

Combine the two, and what do we get? A five-pack of Coors Light Cold Hard Facts about Wi-Fi in the 6 GHz frequency band.


Editor's note: This is a relatively long post, but 6 GHz Wi-Fi is an undoubtably robust topic. If you have questions after reading this blog, comment below or contact Ben via email or Twitter using the information below, and Sniff Wi-Fi will address those answers in a future post.

We may be knee-deep in a global pandemic, but that doesn't mean your humble blogger can't brew up a post on the topic of 6 GHz Wi-Fi.

Wi-Fi professionals will soon have unlicensed frequency available in the 6 GHz band. Here, then, are five facts to know about Wi-Fi in the soon-to-be-available 6 GHz frequency band.

Fact #1: The 6 GHz band adds 1,200 MHz of spectrum for Wi-Fi

The Federal Communications Commission (FCC) is the federal (meaning all of the USA) regulatory organization that sets communications rules in the United States. On April 2, 2020, the FCC released a document indicating proposed rules for allowing unlicensed wireless communications in the 6 GHz frequency band.

The rules apply to Wi-Fi channels that sit between the frequencies of 5.925 GHz and 7.125 GHz. Add that all up, and it comes to 1,200 MHz (or 1.2 GHz) of total frequency spectrum. Channel numbers start at 1 and go up to 233, with available channels spaced 20 MHz (which is four numbers) apart from one another, just like in the pre-existing frequency bands used by Wi-Fi, 2.4 GHz and 5 GHz.

6 GHz unlicensed frequency covers four separate bands. All four operate under the umbrella of unlicensed national information and infrastructure (U-NII) rules. Two of the U-NII bands are allocated for indoor-only use, the other two are indoor-outdoor. (More on the rules for indoor-only and indoor-outdoor later.)

The four U-NII bands of 6 GHz unlicensed frequency are set up like so:
  • U-NII-5 (indoor-outdoor): channels 1 to 97, ranging from 5.925 GHz to 6.425 GHz
  • U-NII-6 (indoor-only): channels 101 to 117, ranging from 6.425 GHz to 6.525 GHz
  • U-NII-7 (indoor-outdoor): channels 121 to 185, ranging from 6.525 GHz to 6.875 GHz
  • U-NII-8 (indoor-only): channels 189 to 233, ranging from 6.875 to 7.125 GHz
Wi-Fi channel bonding is set up using the same structure as the 5 GHz frequency band. Each channel has a dedicated group of channel partners for creating 40 MHz, 80 MHz or 160 MHz wide channels. (One difference between 5 GHz and 6 GHz is that 6 GHz uses a fully bonded 160 MHz wide channel, while 5 GHz uses 80+80 MHz channel bonding. Fully bonded channels offer higher speeds, but also require a broader range of consecutive frequency space.) For example, channel 1 only bonds with channel 5, when making a 40 MHz wide channel. Channels 1 & 5 only bond with channels 9 & 13 when creating an 80 MHz wide channel. Channels 1/5/9/13 only bond with channels 17/21/25/29 when creating a 160 MHz wide channel.

Rick Murphy of Wireless Training Solutions put together an elegant chart showing the channel numbering and groupings for 6 GHz Wi-Fi.


Fact #2: Rules for indoor-outdoor 6 GHz channels are mostly the same as the rules for 5 GHz

APs and clients using U-NII-5 or U-NII-7 channels must abide by indoor-outdoor rules for the 6 GHz band.

Conducted power (refered to as "transmit power" by most Wi-Fi professionals) and equivalent isotropically radiated power (EIRP) rules for 5 GHz Wi-Fi and 6 GHz indoor-outdoor Wi-Fi are identical.
  • Maximum conducted power for APs: 30 dBm (1,000 mW)
  • Maximum EIRP for APs: 36 dBm
  • Maximum conducted power for clients: 24 dBm (250 mW)
  • Maximum EIRP for clients: 30 dBm
There are two important differences between rules for 5 GHz APs and 6 GHz indoor-outdoor APs: Automatic Frequency Coordination (AFC) and listen-before-talk (LBT) rules.

AFC is a database of existing networks using licensed frequencies in the 6 GHz band. That's LICENSED, not unlicensed. Licensed 6 GHz networks could be some kind of site-to-site wireless link, mobile network or perhaps satellite link. Licensed frequencies are owned, and thus cannot be compromised by unlicensed devices operating on the same frequencies.

AFC compliant Wi-Fi 6E APs will have to search the AFC database and blacklist any channels that are used by nearby licensed frequency deployments. As of two years ago, Wi-Fi lobbyists were pushing the FCC to eschew AFC requirements over as much of the 6 GHz band as possible. My understanding is that Wi-Fi vendors are now amenable to creating products that use AFC (although I am not certain).

Listen-before-talk (LBT) is a rule Wi-Fi lobbyists were hoping the FCC would implement across as much of the 6 GHz band as possible. Wi-Fi networks naturally use LBT, in the form of the 802.11 Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) protocols. CSMA/CA requires Wi-Fi devices to go through a process called Arbitration before transmitting any frames (aka packets). Arbitration involves staying quiet until the AP's channel is clear. Listen (Arbitration) before Talk (frames). LBT is required on 5 GHz Wi-Fi channels, under the current interpretation of FCC rules.

Service provider networks do not use LBT. Their network infrastructure equipment is designed to operate in licensed frequency bands, which can be owned by the service provider. Since the service provider owns the license, there is no need to waste time "listening". It's talk, talk, talk, talk, talk.


By requiring AFC and eschewing LBT requirements for the indoor-outdoor channels of the 6 GHz band, the FCC has made those channels less friendly to Wi-Fi. Channels 1 to 97 and 121 to 185 may end up being available in Wi-Fi 6E APs and clients. It is possible that APs and/or clients might avoid those channels. Time will tell.

Fact #3: Rules for indoor-only 6 GHz channels are quite different than 5 GHz channel rules

APs and clients using U-NII-6 or U-NII-8 channels must abide by indoor-only rules for the 6 GHz band.

There are three physical AP rules for indoor-only 6 GHz channels: APs may not be weatherproof. No external antennas are allowed. Battery-powered APs are forbidden. I don't expect any of these rules to be a problem for enterprise AP vendors or residential wireless router/modem vendors.

The radio power rules for indoor-only 6 GHz channels could be a problem.

For indoor-only 6 GHz channels, the FCC limits radios and antennas by power spectral density (PSD) rather than EIRP.
  • EIRP (dBm) = conducted power (dBm) + antenna gain (dBi) + MIMO offset (dB)
  • PSD (dBm/MHz) = EIRP (dBm) - 10 * log [channel width, in MHz] (dB)
The limits are:
  • Maximum PSD for APs: 5 dBm/MHz
  • Maximum PSD for clients: -1 dBm/MHz
This information leads to our next 6 GHz Wi-Fi fact...

Fact #4: Indoor-only 6 GHz Wi-Fi is intended to be used by APs configured for wide channels

Indoor-only 6 GHz bands, which include channels 101 to 117 and 185 to 233, have radio power limits covered by PSD, rather than EIRP.

Many Wi-Fi professionals are, for the moment, unfamiliar with PSD. I certainly was, before I began researching 6 GHz Wi-Fi rules. The key to tying radio power limits to PSD instead of EIRP is that it creates a bias towards wider channels.

For example...

If you do the math on 20 MHz wide channels, you'll find that indoor-only 6 GHz channels have the following limits:
  • Maximum EIRP for APs on a 20 MHz wide indoor-only channel: 18 dBm
  • Maximum EIRP for clients on a 20 MHz wide indoor-only channel: 12 dBm
Seems OK, until you do the math for conducted power. If we take a typical, 4-stream multiple input/multiple output (MIMO) AP with a 3 dBi internal antenna, the the limit becomes:
  • Maximum conducted power for APs on a 20 MHz wide indoor-only channel: 9 dBm
9 dBm is a very low conducted power. It's only about 8 mW. Most client devices rarely use a conducted power as low as 8 mW, if at all. If APs are limited to a MAXIMUM conducted power of 8 mW, it could cause all sort of performance issues for modern Wi-Fi clients.

But...

Look what happens when 80 MHz wide channels are used:
  • Maximum EIRP for APs on a 80 MHz wide indoor-only channel: 24 dBm
  • Maximum EIRP for clients on a 80 MHz wide indoor-only channel: 18 dBm
And, therefore:
  • Maximum conducted power for APs on a 20 MHz wide indoor-only channel: 15 dBm
15 dBm is a totally acceptable conducted power level for enterprise-class APs supporting modern Wi-Fi client devices. It is equal to approximately 30 mW. With rare exceptions, modern client devices are capabile of using conducted power levels at or close to 30 mW.

The bottom line is, the FCC created PSD limits for indoor-only 6 GHz channels which allow APs using channel widths of at least 80 MHz to function normally, but that restrict the performance of APs which use channel widths of 20 or 40 MHz.

Fact #5: 6 GHz Wi-Fi is for Wi-Fi 6 (802.11ax), not Wi-Fi 1/2/3/4/5 (802.11b/a/g/n/ac)

For starters, there is no standard for Wi-Fi 1 (802.11b), 2 (.11a), 3 (.11g), 4 (.11n) or 5 (.11ac) in the 6 GHz frequency band. There is a standard for Wi-Fi 6 (802.11ax) APs and clients in the 6 GHz band, and it is called Wi-Fi 6E.

History has taught us that Wi-Fi AP and client vendors will often make products that operate on the edges of standards, or in some cases fully outside standards.

Your humble blogger would not be surprised if, for example, Wi-Fi 5 (and perhaps even Wi-Fi 4) devices that support 5 GHz channels will some day get a software upgrade that allows for 6 GHz channel support. Perhaps there is a way; perhaps there are also limitations. I'm not sure.

Whether non-standard Wi-Fi 5 (and perhaps Wi-Fi 4) upgrades for 6 GHz frequencies happen, there is a mitigating factor: FCC rules for 6 GHz Wi-Fi channels are designed for wide channels, and the radio technology for Wi-Fi 5 (and Wi-Fi 4) isn't.

Wi-Fi 5 (and Wi-Fi 4) supports orthogonal frequency division multiplexing (OFDM). (Wi-Fi 6 also supports OFDM, as a backwards compatibility measure and a way for clients to opt-out of AP control [which is a topic for a future blog post!].) OFDM is a technology that often struggles for stability when 80 MHz wide channels are used, because OFDM APs and clients must always use the entire channel width when transmitting or receiving frames (aka packets).

Wi-Fi 6, on the other hand, supports orthogonal frequency division multiple access (OFDMA).  OFDMA is flexible, in terms of channel widths. APs can choose to use the entire channel when transmitting or receiving wireless frames, or divide up channels between individual client devices by assigning different subchannels -- called resource units (RUs) -- to each client. This flexibility allows for super fast speeds when fewer clients are active on a given AP, and better stability when a high number of clients are active.

Wi-Fi lobbyists and FCC commissioners likely felt good about designing 6 GHz unlicensed rules to suit channel widths of 80 MHz and up (see: Fact #4) because Wi-Fi 6 is the only standard certified for the 6 GHz band, and Wi-Fi 6 includes OFDMA.

Unfortunately (or fortunately, if you are a vendor or integrator), enterprise Wi-Fi deployments with Wi-Fi 5 (or Wi-Fi 4) APs will almost certainly need to do a rip-out and re-mount upgrade in order to be able to take advantage of the additional channels of 6 GHz.


In summary, it can be fairly said that the FCC's unlicensed rules for the 6 GHz band are very helpful, while perhaps falling short of being a silver bullet. If regulations for the indoor-outdoor channels of UNII-5 and UNII-7 allow for upgraded, consistent Wi-Fi performance, then 6 GHz Wi-Fi will paint an even rosier picture than your humble blogger anticipates. If not, we still get the extra indoor-only channels of UNII-6 and UNII-8, and the accompanying improvements that come from greater spectrum availability.
 
***

Ben Miller works as a Wi-Fi contractor, with a background in pre- and post-installation consulting, technical and marketing writing, and instruction for vendor-neutral and vendor-specific Wi-Fi training. You can contact Ben via email, or follow him on Twitter and Twitch, using the contact information below.

If you like Ben's blog, you can support it by shopping through his Amazon link, or becoming a Patron on Patreon. He does a weekly educational Twitch stream about Wi-Fi.

Thank you.

Twitter: @benmiller

Twitch: @ben_sniffwifi

ben_miller at icloud dot com

Comments

  1. Shouldn´t current access points (802.11ac, 802.11ax) be able to utlize at least some of the 6 GHz channels with their current 5 GHz antenna, aswell? So, using (at least some not all) 6 GHz channels right away after running a software update should be possible?

    ReplyDelete
  2. In fact, according to Cisco, 59% of mobile data traffic at bathroom renovation seattle

    ReplyDelete
  3. Ucuz, kaliteli ve organik sosyal medya hizmetleri satın almak için Ravje Medyayı tercih edebilir ve sosyal medya hesaplarını hızla büyütebilirsin. Ravje Medya ile sosyal medya hesaplarını organik ve gerçek kişiler ile geliştirebilir, kişisel ya da ticari hesapların için Ravje Medyayı tercih edebilirsin. Ravje Medya internet sitesine giriş yapmak için hemen tıkla: ravje.com

    İnstagram takipçi satın almak için Ravje Medya hizmetlerini tercih edebilir, güvenilir ve gerçek takipçilere Ravje Medya ile ulaşabilirsin. İnstagram takipçi satın almak artık Ravje Medya ile oldukça güvenilir. Hemen instagram takipçi satın almak için Ravje Medyanın ilgili sayfasını ziyaret et: instagram takipçi satın al

    Tiktok takipçi satın al istiyorsan tercihini Ravje Medya yap! Ravje Medya uzman kadrosu ve profesyonel ekibi ile sizlere Tiktok takipçi satın alma hizmetide sunmaktadır. Tiktok takipçi satın almak için hemen tıkla: tiktok takipçi satın al

    İnstagram beğeni satın almak için Ravje medya instagram beğeni satın al sayfasına giriş yap, hızlı ve kaliteli instagram beğeni satın al: instagram beğeni satın al

    Youtube izlenme satın al sayfası ile hemen youtube izlenme satın al! Ravje medya kalitesi ile hemen youtube izlenme satın almak için tıklayın: youtube izlenme satın al

    Twitter takipçi satın almak istiyorsan Ravje medya twitter takipçi satın al sayfasına tıkla, Ravje medya güvencesi ile organik twitter takipçi satın al: twitter takipçi satın al

    ReplyDelete
  4. Instyle jackets is one of the best leather jacket quality provider provides best leather jackets and new designs. We make new designs and custom designs for our customers to fulfill their requirements. visit to our website to get the best quality.

    ReplyDelete
  5. Thanks for the nice blog. It was very useful for me. I'm happy I found this blog. Thank you for sharing with us,I too always learn something new from your post.
    full stack development course

    ReplyDelete
  6. Thanks for the nice blog. It was very useful for me. I'm happy I found this blog. Thank you for sharing with us, and good safe land info for you check my web site
    안전놀이터

    ReplyDelete
  7. In fact, according to Cisco, 59% of mobile data traffic at good and good toto site info for you 토토사이트

    ReplyDelete
  8. operate under the umbrella of unlicensed national information and infrastructure rules. Essay Champ bands are allocated for indoor-only use.

    ReplyDelete
  9. Interesting post. I Have Been wondering about this issue, so thanks for posting. Pretty cool post.It 's really very nice and Useful post.Thanks
    full stack development course

    ReplyDelete
  10. you will need support or suggestions, write me privately.
    I interested in your implementation/use case.
    the best kera4d
    Togel2win

    ReplyDelete
  11. 6GHz WiFi would be very good. I just hope it well be done well.

    SEO companies Tampa

    ReplyDelete
  12. The Internet is one of the greatest creations and provides people with instant access to an endless supply of knowledge and entertainment. Your wifi connection is very important to run the internet. Nowadays you will find many online websites and applications on the internet which can provide you best wifi services sitting at home. For example, Cayman Internet Providers ​has High-speed internet with enough bandwidth for the whole family.

    ReplyDelete
  13. Thanks for sharing this interesting blog, great post. https://sunnysidetechrepair.com/

    ReplyDelete
  14. Great blog! Wonderful! Thanks for sharing this information with us... An article gives a lot of information.. What is a Turkish visa online ? It is nothing more than a substitute for a Turkish physical visa. but the application process is more simple than the Turkish physical visa. You can also check the details about the Turkish online visa.



    ReplyDelete
  15. Great facts. I enjoyed reading it and I learned something about it. https://cincinnati-seo.com/

    ReplyDelete
  16. Great blog! Thanks for the share. info

    ReplyDelete
  17. Hello guys, “Waking up in India is like waking up to life.” Foreign nationals can come to India and see the beauty of this country.But you don't know how to apply for an India e Visa? You can get Indian tourist visa info via our Indian visas website.

    ReplyDelete
  18. This comment has been removed by the author.

    ReplyDelete
  19. Glad to found this great website. Keep sharing. fence-companies-birmingham-al

    ReplyDelete
  20. At Tow Truck Blue Springs, MO, we put the comfort of our clients first. In a bid to make our superior towing service available to the whole of Missouri, we decided to have our tow trucks around the state. Therefore, you can call us if you’re anywhere around Blue Springs, MO, Independence, MO, Sugar Creek, MO, Lee’s Summit, MO, and Buckner, MO.

    ReplyDelete
  21. Kind of. According to the Wi-Fi 6 standard, the most recent iteration of Wi-Fi, the theoretical maximum speed for 6GHz Wi-Fi is 9.6 Gbps, the same as that of 5GHz Wi-Fi. Even if you won't achieve that speed in real life, the new airwaves should help you accelerate.

    ReplyDelete
  22. Thank you for sharing this helpful information about 5 facts about 6 GHz Wi-Fi. Find out more info here.

    ReplyDelete
  23. Thank you for sharing this amazing facts, it is very useful for us to know this. See more about Concrete Contractors Harrisonburg VA

    ReplyDelete
  24. Amazing blog well detailed and informative this is my first time being in a blog that is more information. Well done!

    ReplyDelete
  25. Speed and range are the two main distinctions between these revolutionary internet technologies, 2.4 GHz and 5 GHz Wifi connections. While 5 GHz offers faster speeds but is limited to a smaller area, 2.4 GHz wireless transmission extends internet access to a broader area at the expense of speed.

    ReplyDelete
  26. Automatic Frequency Coordination (AFC) and listen-before-talk (LBT) rules are the two key distinctions between the rules for 5 GHz APs and 6 GHz indoor-outdoor APs.

    ReplyDelete
  27. Although they may not be a perfect solution, the FCC's unlicensed restrictions for the 6 GHz spectrum are highly beneficial.

    ReplyDelete
  28. it's really nice and meaningful. it's really cool blog. Linking is very useful thing. You have really helped lots of people who visit blog and provide them useful information.

    ReplyDelete
  29. I was eager to find this page. I needed to thank you for ones time for this especially awesome read!! I certainly truly preferred all aspects of it and I likewise have you book-set apart to look at new data in your blog. Find out more info here

    ReplyDelete
  30. Awesome post thank you for sharing check my article here Strange Clouds

    ReplyDelete
  31. What a very informative site! Thank you for sharing!
    www.landscapingma.com/landscaping-plymouth-ma

    ReplyDelete
  32. Your Article is so good and informative thanks for sharing this content Sec Law

    ReplyDelete
  33. Awesome post thank you for sharing check article here Class Action Insider

    ReplyDelete
  34. This flexibility allows for super fast speeds when fewer clients are active on a given AP, and better stability when a high number of clients are active.
    sunsetter in Jackson New Jersey

    ReplyDelete
  35. Thanks for sharing such a great blog.
    concrete in fort worth

    ReplyDelete
  36. Glad to found this amazing blog. Looking for more.
    milwaukee-fence

    ReplyDelete
  37. To recollect the splendid time of arcade gaming, then, the Pandora Box 4S is the best solution for you. It goes with all of the commendable games that you recall, and is easy to set up and use. With its wide bunch of games, there is something for everyone to appreciate. So the thing could you say you are holding on for? Get your hands on a Pandora Box 4S today. Check this out pandora arcade box game list

    ReplyDelete
  38. Wonderful post thank you for sharing really take a look at article here https://www.seo-bookmarks.win/direct-response-examples

    ReplyDelete
  39. Thanks for sharing such a great website. Keep sharing.
    fence installation raleigh nc

    ReplyDelete
  40. I'm thinking a few about my per users could track down a touch of this fascinating. Would you care if I post a clasp from this and connection back? Much obliged you could try these out

    ReplyDelete
  41. Much thanks to you for the distinct data. They were truly useful to me, who had recently been invested into related energy. Also, thank you for suggesting other valuable sites that I may be keen on. I'll let you know where to help me, as well Stock Fraud News

    ReplyDelete
  42. I just found your weblog and wanted to say that I have truly appreciated riding your blog articles. Positive site, full report here.

    ReplyDelete
  43. Perhaps there is a way; perhaps there are also limitations. I'm not sure. bathroom tub to shower remodel Arlington TX

    ReplyDelete
  44. You're well aware that your projects stand out from the crowd. They have a unique quality to them. They all look to me to be quite brilliant! https://www.evernote.com/shard/s699/sh/2be816a1-ee15-161b-71c6-8eeb5b386948/6b82b72947e72331928e108963dc2f0e

    ReplyDelete
  45. You have a good content! Thanks for sharing https://careers.tql.com

    ReplyDelete
  46. I have been looking for articles on these focuses for a surprisingly long time. I have no clue about how appreciative you are for posting on this topic. Thankful to you for the different articles on this site, I will become involved with those associations in my bookmarks and visit them regularly. Have a wonderful day https://app.gumroad.com/nirneynlrk/p/everything-you-ve-ever-wanted-to-know-about-start-an-online-coaching-business

    ReplyDelete
  47. This comment has been removed by the author.

    ReplyDelete
  48. The easiest way to limit sugar's impact on your teeth is to limit your daily intake. | More Here

    ReplyDelete
  49. One of the benefits of an emergency dentist is the immediate care they provide.

    ReplyDelete
  50. Yaaas! this is so amazing, thanks for this info. applicationfiling.com

    ReplyDelete

Post a Comment

Popular posts from this blog

Go To Sleep, Go To Sleep, Go To Sleep Little iPhone

Chips, Glorious Wi-Fi 6E Chips!