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hostapd: Extend support for HT 20/40 coexistence feature

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Extend the minimal HT 20/40 co-ex support to include dynamic changes
during the lifetime of the BSS. If any STA connects to a 2.4 GHz AP with
40 MHz intolerant bit set then the AP will switch to 20 MHz operating
mode.

If for a period of time specified by OBSS delay factor and OBSS scan
interval AP does not have any information about 40 MHz intolerant STAs,
the BSS is switched from HT20 to HT40 mode.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Peng Xu 2014-04-14 20:40:56 +03:00 • committed by Jouni Malinen
parent 196c9c7cd2
commit 9c47f6a2a6
10 changed files with 140 additions and 1 deletions
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7
src/ap/hostapd.h
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@ -327,6 +327,9 @@ struct hostapd_iface {
/* Number of HT associated stations 20 MHz */
int num_sta_ht_20mhz;
/* Number of HT40 intolerant stations */
int num_sta_ht40_intolerant;
/* Overlapping BSS information */
int olbc_ht;
@ -351,6 +354,10 @@ struct hostapd_iface {
unsigned int dfs_cac_ms;
struct os_reltime dfs_cac_start;
/* Latched with the actual secondary channel information and will be
* used while juggling between HT20 and HT40 modes. */
int secondary_ch;
#ifdef CONFIG_ACS
unsigned int acs_num_completed_scans;
#endif /* CONFIG_ACS */