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| --- This message came from the IEEE 802.11 Working Group Reflector ---
G’day all Earlier today, the Coex SC met. The agenda is available in
11-22-0278-01 One of the topics discussed was potential adverse impact on IEEE 802.11be (Wi-Fi 7) performance, compared to IEEE 802.11ax (Wi-Fi 6) performance, when operating in the 5 GHz band in Europe (or countries that follow European rules) under
the latest version of EN 301 893 (see
11-22-0180-03 for more details). It was noted that it would be unfortunate if the next generation of Wi-Fi (Wi-Fi 7 based in 802.11be) has less performance than the current generation (Wi-Fi 6 based on 802.11ax) in (m)any scenarios. A variety of technical and marketing orientated solutions to this problem were identified and discussed. Each has advantages and disadvantages, and none are terribly compelling at first look. The Coex SC and TGbe will need to consider the
various technical options in the future. For example, should 802.11be in 5 GHz in Europe operate in an PD/ED @ -72/-72 dBm mode, PD/ED @ -82/-72 dBm mode or some other mode to ensure the best possible coex with 802.11ax and other technologies? An alternative way of solving the problem is to not operate in 802.11be mode in 5 GHz in Europe, rather operating in 802.11ax mode only, particularly if operating in a multi-technology environment (Wi-Fi 6/7, NR-U, LAA) where relative performance
and good coexistence is important. The decision not to operate in 802.11be mode would typically be made at deployment time depending on conditions in each particular environment. It was suggested that the WG might like to ask the WFA if this is a viable solution
from a market perspective (see a draft LS in
11-22-0486-00). There was some opposition to such a question to the WFA on the basis that it was so obviously an unacceptable solution, particularly as MLO (an important 802.11be feature) assumes 802.11be mode operation in multiple bands, including 5 GHz. Another alternative discussed was to ask ETSI BRAN to relax the EDT constraint to -62 dBm. It was noted that the cellular stakeholders would probably be delighted with this option. It would allow 802.11be to operate according to the 802.11
standard (generally PD/ED @ -82/-62 dBm), but it would also allow NR-U and LAA to obtain a greater share of the medium, as shown by many simulations over the years. That said, this would be a good solution if NR-U and LAA were rarely deployed in the same channels
as Wi-Fi. It was suggested the WFA be asked about their assessment of the likelihood that this was the case. There was some opposition to such a question to the WFA on the basis that the WFA would not know much about their competition. This is probably true,
but maybe the WFA should have a better perspective of the competitive environment? In the end, it was decided to defer any LS to the WFA, and I committed to starting an e-mail thread instead to discuss next steps:
Feel free to:
Andrew Myles Chair IEEE 802.11 Coex SC To unsubscribe from the STDS-802-11 list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-11&A=1 |