Re: [PATCH] wireless-regdb: Update regulatory info for Canada (CA) for 2025

Chen-Yu Tsai <[email protected]> wrote:
>
> Canada issued a new revision of its regulatory standards for 2.4 GHz
> and 5 GHz license-exempt local area network devices - RSS-247.
>
> Update the rules to match the new version. Fix up band boundaries and
> power limit values and units to match the text.
>
> Note: the database is supposed to have values for e.i.r.p.. Most
> regulatory documents specify e.i.r.p. as well, except for FCC ones and
> any regions that have rules based on FCC ones.
>
> Details about the changes and justification for them are as follows.
>
> - 2.4 GHz band boundary aligned to actual text instead of WiFi channels
>
> - 2.4 GHz band changed from 30 dBm (1W) to 4 W
>   section 6.3.2 explicitly states e.i.r.p. limit at 4 W.
>
> - 5.15 ~ 5.25 GHz band power limit unit changed to mW
>   section 7.3.1.2 explicitly states e.i.r.p. limit at 200 mW.
>
> - 5.25 ~ 5.35 GHz band power limit changed to 500 mW
>   section 7.3.2.2 states e.i.r.p. limit at 1 W, but requires TPC for
>   e.i.r.p. above 500 mW. As the database nor Linux implements TPC,
>   the 500 mW limit is chosen.
>
> - 5.4 ~ 5.725 GHz band combined and power limit unit changed to mW
>   the new revision removed the restriction 5.6 ~ 5.65 GHz usage.
>   the two existing rules are combined to cover the whole band,
>   and the upper boundary has been increased to 5.73 GHz to cover
>   the whole WiFi channel and make it easier to write the rule,
>   like how the US rules are written.
>
>   section 7.3.3.2 states e.i.r.p. limit at 1 W, but requires TPC for
>   e.i.r.p. above 500 mW. As the database nor Linux implements TPC,
>   the 500 mW limit is chosen.
>
> - 5.725 ~ 5.85 GHz boundaries aligned and limit changed from 30 dBm (1W)
>   to 4 W; AUTO-BW added for combined usage with next band.
>
>   section 7.3.4.3 states maximum conducted power limit at 1 W, but no
>   explicit e.i.r.p. limit is given.
>
>   apply "e.i.r.p. = max conducted power + 6 dBi" conversion, arriving
>   at roughly 4 W. This aligns with the ratio for the 2.4 GHz band.
>
> - 5.85 ~ 5.895 GHz band newly opened in this revision
>   section 7.3.5.3 states maximum e.i.r.p. for indoor clients at 1 W or
>   30 dBm, with maximum e.i.r.p. spectral density at 14 dBm / MHz.
>
>   Apply spectral density limit at 20 MHz channel width, arriving at
>   roughly 27 dBm e.i.r.p. limit.
>
>   While the limit comes from the "indoor clients" rule, it is the lowest
>   limit of all the types, hence it should be applicable without any
>   restrictions.
>
> Signed-off-by: Chen-Yu Tsai <[email protected]>

All content is consistent with the description in RSS-247.

Reviewed-by: Ping-Ke Shih <[email protected]>