When determining the expected throughput from a AP, take the AP-reported
channel utilization (QBSS Load element) into consideration.
Signed-off-by: David Bauer <mail@xxxxxxxxxxxxxxx>
---
wpa_supplicant/scan.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/wpa_supplicant/scan.c b/wpa_supplicant/scan.c
index 97a8d9a63..e8cc8b623 100644
--- a/wpa_supplicant/scan.c
+++ b/wpa_supplicant/scan.c
@@ -2617,7 +2617,7 @@ void scan_est_throughput(struct wpa_supplicant *wpa_s,
{
int rate; /* max legacy rate in 500 kb/s units */
int snr = res->snr;
- const u8 *ies = (const void *) (res + 1);
+ const u8 *ies = (const void *) (res + 1), *ie;
size_t ie_len = res->ie_len;
if (res->est_throughput)
@@ -2631,7 +2631,19 @@ void scan_est_throughput(struct wpa_supplicant *wpa_s,
res->est_throughput =
wpas_get_est_tpt(wpa_s, ies, ie_len, rate, snr, res->freq);
- /* TODO: channel utilization and AP load (e.g., from AP Beacon) */
+ /* Estimate throughput based on channel load reported by AP.
+ * Assume that a load of 255 (100%) means no throughput is
+ * possible. A load of 0 equals to the full estimated throughput
+ * being achievable.
+ *
+ * Use the calculated throughput without any panilty, in case
+ * BSS load element is not present.
+ */
+ ie = get_ie(ies, ie_len, WLAN_EID_BSS_LOAD);
+ if (ie == NULL || ie[1] < 5)
+ return; /* No BSS Load advertised */
+
+ res->est_throughput = (res->est_throughput * (255 - ie[4])) / 255;
}
--
2.33.0
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