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Make it a bit easier to roam from 2.4 GHz to 5 GHz within ESS

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The initial connection to an ESS was already explicitly increasing the
likelihood of picking a 5 GHz BSS. While the throughput estimation is
likely to do same for the roaming decision, it might be possible that
that does not cover all cases. Add couple of dB extra preference for 5
GHz in case the roaming decision falls back to comparing signal levels.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2016-03-25 11:53:59 +02:00
parent 585141bb30
commit 954e10e483
1 changed files with 12 additions and 1 deletions
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13
wpa_supplicant/events.c
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@ -1346,6 +1346,7 @@ static int wpa_supplicant_need_to_roam(struct wpa_supplicant *wpa_s,
struct wpa_bss *current_bss = NULL; struct wpa_bss *current_bss = NULL;
#ifndef CONFIG_NO_ROAMING #ifndef CONFIG_NO_ROAMING
int min_diff; int min_diff;
int to_5ghz;
#endif /* CONFIG_NO_ROAMING */ #endif /* CONFIG_NO_ROAMING */
if (wpa_s->reassociate) if (wpa_s->reassociate)
@ -1401,7 +1402,10 @@ static int wpa_supplicant_need_to_roam(struct wpa_supplicant *wpa_s,
return 1; return 1;
} }
if (current_bss->level < 0 && current_bss->level > selected->level) { to_5ghz = selected->freq > 4000 && current_bss->freq < 4000;
if (current_bss->level < 0 &&
current_bss->level > selected->level + to_5ghz * 2) {
wpa_dbg(wpa_s, MSG_DEBUG, "Skip roam - Current BSS has better " wpa_dbg(wpa_s, MSG_DEBUG, "Skip roam - Current BSS has better "
"signal level"); "signal level");
return 0; return 0;
@ -1420,6 +1424,13 @@ static int wpa_supplicant_need_to_roam(struct wpa_supplicant *wpa_s,
else else
min_diff = 5; min_diff = 5;
} }
if (to_5ghz) {
/* Make it easier to move to 5 GHz band */
if (min_diff > 2)
min_diff -= 2;
else
min_diff = 0;
}
if (abs(current_bss->level - selected->level) < min_diff) { if (abs(current_bss->level - selected->level) < min_diff) {
wpa_dbg(wpa_s, MSG_DEBUG, "Skip roam - too small difference " wpa_dbg(wpa_s, MSG_DEBUG, "Skip roam - too small difference "
"in signal level"); "in signal level");