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Add support to estimate throughput for VHT 160/80+80 MHz supporting APs

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Add support to calculate estimated throughputs for APs which support the
160 MHz (including 80+80 MHz) mode in VHT. The minimum SNR values for
VHT 160 MHz mode are derived from minimum SNR values used for VHT 80 MHz
mode + 3 dBm. The min-SNR values are derived relatively based on the
information that the minimum sensitivity levels defined in Table 21-25
(Receiver minimum input level sensitivity) in IEEE Std 802.11-2020 for
the 160 MHz mode are higher by 3 dBm compared to the values of the 80
MHz mode for each rate.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Vamsi Krishna 2021-05-05 01:04:54 +05:30 committed by Jouni Malinen
parent 1d2118b509
commit 658b6a0b08
1 changed files with 53 additions and 2 deletions
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55
wpa_supplicant/scan.c
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@ -2276,6 +2276,22 @@ static const struct minsnr_bitrate_entry vht80_table[] = {
}; };
static const struct minsnr_bitrate_entry vht160_table[] = {
{ 0, 0 },
{ 11, 58500 }, /* VHT160 MCS0 */
{ 14, 117000 }, /* VHT160 MCS1 */
{ 18, 175500 }, /* VHT160 MCS2 */
{ 20, 234000 }, /* VHT160 MCS3 */
{ 24, 351000 }, /* VHT160 MCS4 */
{ 27, 468000 }, /* VHT160 MCS5 */
{ 29, 526500 }, /* VHT160 MCS6 */
{ 34, 585000 }, /* VHT160 MCS7 */
{ 38, 702000 }, /* VHT160 MCS8 */
{ 40, 780000 }, /* VHT160 MCS9 */
{ -1, 780000 } /* SNR > 37 */
};
static unsigned int interpolate_rate(int snr, int snr0, int snr1, static unsigned int interpolate_rate(int snr, int snr0, int snr1,
int rate0, int rate1) int rate0, int rate1)
{ {
@ -2320,6 +2336,12 @@ static unsigned int max_vht80_rate(int snr)
} }
static unsigned int max_vht160_rate(int snr)
{
return max_rate(vht160_table, snr, 1);
}
unsigned int wpas_get_est_tpt(const struct wpa_supplicant *wpa_s, unsigned int wpas_get_est_tpt(const struct wpa_supplicant *wpa_s,
const u8 *ies, size_t ies_len, int rate, const u8 *ies, size_t ies_len, int rate,
int snr, int freq) int snr, int freq)
@ -2396,6 +2418,8 @@ unsigned int wpas_get_est_tpt(const struct wpa_supplicant *wpa_s,
/* Use +1 to assume VHT is always faster than HT */ /* Use +1 to assume VHT is always faster than HT */
ie = get_ie(ies, ies_len, WLAN_EID_VHT_CAP); ie = get_ie(ies, ies_len, WLAN_EID_VHT_CAP);
if (ie) { if (ie) {
bool vht80 = false, vht160 = false;
tmp = max_ht20_rate(snr, true) + 1; tmp = max_ht20_rate(snr, true) + 1;
if (tmp > est) if (tmp > est)
est = tmp; est = tmp;
@ -2409,13 +2433,40 @@ unsigned int wpas_get_est_tpt(const struct wpa_supplicant *wpa_s,
est = tmp; est = tmp;
} }
/* Determine VHT BSS bandwidth based on IEEE Std
* 802.11-2020, Table 11-23 (VHT BSs bandwidth) */
ie = get_ie(ies, ies_len, WLAN_EID_VHT_OPERATION); ie = get_ie(ies, ies_len, WLAN_EID_VHT_OPERATION);
if (ie && ie[1] >= 1 && if (ie && ie[1] >= 3) {
(ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK)) { u8 cw = ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK;
u8 seg0 = ie[3];
u8 seg1 = ie[4];
if (cw)
vht80 = true;
if (cw == 2 ||
(cw == 3 &&
(seg1 > 0 && abs(seg1 - seg0) == 16)))
vht160 = true;
if (cw == 1 &&
((seg1 > 0 && abs(seg1 - seg0) == 8) ||
(seg1 > 0 && abs(seg1 - seg0) == 16)))
vht160 = true;
}
if (vht80) {
tmp = max_vht80_rate(snr) + 1; tmp = max_vht80_rate(snr) + 1;
if (tmp > est) if (tmp > est)
est = tmp; est = tmp;
} }
if (vht160 &&
(hw_mode->vht_capab &
(VHT_CAP_SUPP_CHAN_WIDTH_160MHZ |
VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ))) {
tmp = max_vht160_rate(snr) + 1;
if (tmp > est)
est = tmp;
}
} }
} }