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hostapd: Update 160 MHz center freq calculation in 6 GHz

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In the 6 GHz Operation Information field, the Channel Center Frequency
Segment 0 field indicates the channel center frequency index for
the 20 MHz, 40 MHz, 80 MHz, or 80+80 MHz channel on which the
BSS operates in the 6 GHz band. If the BSS channel width is 160 MHz
then the Channel Center Frequency Segment 0 field indicates the
channel center frequency index of the primary 80 MHz.

The Channel Center Frequency Segment 1 field indicates the channel
center frequency index of the 160 MHz channel on which the BSS operates
in the 6 GHz band or the channel center frequency of the secondary 80
MHz for the 80+80 MHz channel.

Since Channel Center Frequency Segment 1 was 0 for 160 MHz, 6 GHz STA
associated using 80 MHz. Update seg0 and seg1 fields per standard (IEEE
P802.11ax/D8.0: 9.4.2.249 HE Operation element).

Signed-off-by: P Praneesh <ppranees@codeaurora.org>
This commit is contained in:
P Praneesh 2021-04-05 11:15:26 +05:30 committed by Jouni Malinen
parent 9c6b0a9416
commit 79e8f0c164
2 changed files with 21 additions and 1 deletions
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5
hostapd/hostapd.conf
View file

@ -837,6 +837,11 @@ wmm_ac_vo_acm=0
#he_rts_threshold=0 #he_rts_threshold=0
# HE operating channel information; see matching vht_* parameters for details. # HE operating channel information; see matching vht_* parameters for details.
# he_oper_centr_freq_seg0_idx field is used to indicate center frequency of 80
# and 160 MHz bandwidth operation. In 80+80 MHz operation, it is the center
# frequency of the lower frequency segment. he_oper_centr_freq_seg1_idx field
# is used only with 80+80 MHz bandwidth operation and it is used to transmit
# the center frequency of the second segment.
# On the 6 GHz band the center freq calculation starts from 5.950 GHz offset. # On the 6 GHz band the center freq calculation starts from 5.950 GHz offset.
# For example idx=3 would result in 5965 MHz center frequency. In addition, # For example idx=3 would result in 5965 MHz center frequency. In addition,
# he_oper_chwidth is ignored, and the channel width is derived from the # he_oper_chwidth is ignored, and the channel width is derived from the

17
src/ap/ieee802_11_he.c
View file

@ -216,7 +216,10 @@ u8 * hostapd_eid_he_operation(struct hostapd_data *hapd, u8 *eid)
params |= HE_OPERATION_6GHZ_OPER_INFO; params |= HE_OPERATION_6GHZ_OPER_INFO;
/* 6 GHz Operation Information field */ /* 6 GHz Operation Information field
* IEEE P802.11ax/D8.0, 9.4.2.249 HE Operation element,
* Figure 9-788k
*/
*pos++ = hapd->iconf->channel; /* Primary Channel */ *pos++ = hapd->iconf->channel; /* Primary Channel */
/* Control: Channel Width */ /* Control: Channel Width */
@ -226,6 +229,18 @@ u8 * hostapd_eid_he_operation(struct hostapd_data *hapd, u8 *eid)
*pos++ = center_idx_to_bw_6ghz(seg0); *pos++ = center_idx_to_bw_6ghz(seg0);
/* Channel Center Freq Seg0/Seg1 */ /* Channel Center Freq Seg0/Seg1 */
if (hapd->iconf->he_oper_chwidth == 2) {
/*
* Seg 0 indicates the channel center frequency index of
* the 160 MHz channel.
*/
seg1 = seg0;
if (hapd->iconf->channel < seg0)
seg0 -= 8;
else
seg0 += 8;
}
*pos++ = seg0; *pos++ = seg0;
*pos++ = seg1; *pos++ = seg1;
/* Minimum Rate */ /* Minimum Rate */