IEEE 802.11ax-2021

IEEE 802.11ax-2021 eller 802.11ax er en IEEE standard for trådløs lokalnet (WLANs) og efterfølgeren til 802.11ac. 802.11ax markedsføres som Wi-Fi 6 (2.4 GHz og 5 GHz)^[1] og Wi-Fi 6E (6 GHz)^[2] af Wi-Fi Alliance. 802.11ax er også kendt som High Efficiency Wi-Fi, for forbedring af Wi-Fi 6 klienter ved miljøer med mange hosts per arealenhed - fx ved større møderum og undervisningsrum.^[3] 802.11ax er designet til at operere i et licensbånd mellem 1 GHz og 7,125 GHz, inklusiv de eksisterende 2,4 og 5 GHz bånd, som allerede er i anvendelse - såvel som 6 GHz båndet (5,925–7,125 GHz i USA).^[4]

Det overordnede formål med 802.11ax standarden er forbedring af kapaciteten-per-areal^[a] i ved miljøer med mange hosts per arealenhed, såsom virksomhedskontorer, indkøbscentre - og med mange små boliger. Selvom den opgivne datahastighedsforbedring i forhold til 802.11ac kun er 37%,^[3]^:qt er den overordnede datahastighedsforbedring (over et helt trådløst net) 400% (derfor tilnavnet High Efficiency).^[5]^:qt Formidlingsforsinkelsen er 75% lavere.^[6]

IEEE 802.11ax-2021 standarden blev godkendt 9. februar 2021.^[7]^[8]

Hastighedsrepertoire[redigér | rediger kildetekst]

Modulation og kodningsskemaer for en enkelt rum datastrøm
MCS index^[i]	Modulation type	Kodning rate	Datahastighed (i Mbit/s)^[ii]
			20 MHz kanaler		40 MHz kanaler		80 MHz kanaler		160 MHz kanaler
			1600 ns GI^[iii]	800 ns GI	1600 ns GI	800 ns GI	1600 ns GI	800 ns GI	1600 ns GI	800 ns GI
0	BPSK	1/2	8	8.6	16	17.2	34	36.0	68	72
1	QPSK	1/2	16	17.2	33	34.4	68	72.1	136	144
2	QPSK	3/4	24	25.8	49	51.6	102	108.1	204	216
3	16-QAM	1/2	33	34.4	65	68.8	136	144.1	272	282
4	16-QAM	3/4	49	51.6	98	103.2	204	216.2	408	432
5	64-QAM	2/3	65	68.8	130	137.6	272	288.2	544	576
6	64-QAM	3/4	73	77.4	146	154.9	306	324.4	613	649
7	64-QAM	5/6	81	86.0	163	172.1	340	360.3	681	721
8	256-QAM	3/4	98	103.2	195	206.5	408	432.4	817	865
9	256-QAM	5/6	108	114.7	217	229.4	453	480.4	907	961
10	1024-QAM	3/4	122	129.0	244	258.1	510	540.4	1021	1081
11	1024-QAM	5/6	135	143.4	271	286.8	567	600.5	1134	1201

Notes

^ MCS 9 is not applicable to all combinations of channel width and spatial stream count.
^ A second stream doubles the theoretical data rate, a third one triples it, etc.
^ GI stands for guard interval.

Noter[redigér | rediger kildetekst]

^ Throughput-per-area, as defined by IEEE, is the ratio of the total network throughput to the network area.^[3]

Referencer[redigér | rediger kildetekst]

^ "Generational Wi-Fi® User Guide" (PDF). www.wi‑fi.org. oktober 2018. Hentet 22. marts 2021.
^ "Wi-Fi 6E expands Wi-Fi® into 6 GHz" (PDF). www.wi‑fi.org. januar 2021. Hentet 22. marts 2021.
^ ^a ^b ^c E.Khorov, A. Kiryanov, A. Lyakhov, G. Bianchi (2019). "A Tutorial on IEEE 802.11ax High Efficiency WLANs". IEEE Communications Surveys & Tutorials. IEEE. 21 (in press): 197-216. doi:10.1109/COMST.2018.2871099.{{cite journal}}: CS1-vedligeholdelse: Bruger authors parameter (link)
^ "FCC Opens 6 GHz Band to Wi-Fi and Other Unlicensed Uses". www.fcc.gov. 24. april 2020. Hentet 23. marts 2021.
^ Aboul-Magd, Osama (17. marts 2014). "802.11 HEW SG Proposed PAR" (DOCX). www.ieee.org. Arkiveret fra originalen 7. april 2014. Hentet 22. marts 2021.
^ Goodwins, Rupert (3. oktober 2018). "Next-generation 802.11ax wi-fi: Dense, fast, delayed". www.zdnet.com. Hentet 23. marts 2021.
^ "IEEE SA Standards Board Approvals - 09/10 February 2021". www.ieee.org. 9. februar 2021. Hentet 11. marts 2021.
^ "IEEE 802.11ax-2021 - IEEE Approved Draft Standard for Information technology [...]". www.ieee.org. 9. februar 2021. Hentet 11. marts 2021.

Eksterne henvisninger[redigér | rediger kildetekst]

Evgeny Khorov, Anton Kiryanov, Andrey Lyakhov, Giuseppe Bianchi. 'A Tutorial on IEEE 802.11ax High Efficiency WLANs', IEEE Communications Surveys & Tutorials, vol. 21, no. 1, pp. 197-216, Firstquarter 2019. doi: 10.1109/COMST.2018.2871099.
Wi-Fi 6 Unravelled, What it is and how it works
"Are you ready for the next chapter of Wi-Fi? Meet 802.11ax" Arkiveret 19. marts 2020 hos Wayback Machine
Bellalta, Boris (2015). "IEEE 802.11ax: High-Efficiency WLANs". IEEE Wireless Communications. 23: 38-46. arXiv:1501.01496. doi:10.1109/MWC.2016.7422404. S2CID 15023432.
Fleishman, Glenn (25. april 2018). "Wi-Fi gets quicker with 802.11ax, but buying early might offer few advantages". PC World.

[10] MCS 9 is not applicable to all combinations of channel width and spatial stream count.

[11] A second stream doubles the theoretical data rate, a third one triples it, etc.

[12] GI stands for guard interval.

[5] Throughput-per-area, as defined by IEEE, is the ratio of the total network throughput to the network area.^[3]

[generational-1] "Generational Wi-Fi® User Guide" (PDF). www.wi‑fi.org. oktober 2018. Hentet 22. marts 2021.

[6e-2] "Wi-Fi 6E expands Wi-Fi® into 6 GHz" (PDF). www.wi‑fi.org. januar 2021. Hentet 22. marts 2021.

[atutorial-3] E.Khorov, A. Kiryanov, A. Lyakhov, G. Bianchi (2019). "A Tutorial on IEEE 802.11ax High Efficiency WLANs". IEEE Communications Surveys & Tutorials. IEEE. 21 (in press): 197-216. doi:10.1109/COMST.2018.2871099.{{cite journal}}: CS1-vedligeholdelse: Bruger authors parameter (link)

[FCC_Order_2020-04-4] "FCC Opens 6 GHz Band to Wi-Fi and Other Unlicensed Uses". www.fcc.gov. 24. april 2020. Hentet 23. marts 2021.

[PAR-6] Aboul-Magd, Osama (17. marts 2014). "802.11 HEW SG Proposed PAR" (DOCX). www.ieee.org. Arkiveret fra originalen 7. april 2014. Hentet 22. marts 2021.

[Goodwins-7] Goodwins, Rupert (3. oktober 2018). "Next-generation 802.11ax wi-fi: Dense, fast, delayed". www.zdnet.com. Hentet 23. marts 2021.

[ieeefeb-8] "IEEE SA Standards Board Approvals - 09/10 February 2021". www.ieee.org. 9. februar 2021. Hentet 11. marts 2021.

[ieeeapproval-9] "IEEE 802.11ax-2021 - IEEE Approved Draft Standard for Information technology [...]". www.ieee.org. 9. februar 2021. Hentet 11. marts 2021.

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