Important The Native 802.11 Wireless LAN interface is deprecated in Windows 10 and later. Please use the WLAN Device Driver Interface (WDI) instead. For more information about WDI, see WLAN Universal Windows driver model.

When queried, the OID_DOT11_CCA_MODE_SUPPORTED object identifier (OID) requests that the miniport driver return the value of the IEEE 802.11 dot11CCAModeSupported management information base (MIB) object for the current PHY type on the 802.11 station.

This MIB object specifies the types of clear channel assessment (CCA) modes supported by the current PHY type. For more information about CCA, refer to Clause of the IEEE 802.11-2012 standard and Clause of the IEEE 802.11b-1999 standard.

The data type for OID_DOT11_CCA_MODE_SUPPORTED is a ULONG value, which defines the supported CCA modes through the following bitmask:

DOT11_CCA_MODE_ED_ONLY (0x00000001)
Only CCA mode using the energy detect (ED) signal is supported. For more information about the ED signal, refer to Clause of the IEEE 802.11-2012 standard.

DOT11_CCA_MODE_CS_ONLY (0x00000002)
Only CCA mode using the carrier sense (CS) signal is supported. For more information about the CS signal, refer to Clause of the IEEE 802.11-2012 standard.

DOT11_CCA_MODE_ED_and_CS (0x00000004)
Both ED and CS modes are supported.

The dot11CCAModeSupported MIB object is only valid for the following PHY types:

  • Direct-sequence spread spectrum (DSSS) PHY.

  • High-rate DSSS (HRDSSS) PHY.

  • Extended-rate PHY (ERP).

If the current PHY type is not set to dot11_phy_type_dsss, dot11_phy_type_hrdsss, or dot11_phy_type_erp, the miniport driver must fail the query request by returning NDIS_STATUS_INVALID_DATA from its MiniportOidRequest function.

If the miniport driver is operating in Extensible Station (ExtSTA) mode, the current PHY type is determined through the ExtSTA msDot11CurrentPhyID MIB object. This MIB object specifies the index of the current PHY type within the 802.11 station's list of supported PHY types. For more information about this MIB object, see OID_DOT11_CURRENT_PHY_ID.

Note A Native 802.11 miniport driver that is designed to run on the Windows Vista or Windows Server 2008 operating systems must always reset this 802.11 MIB OID to its default value. This is the case regardless of the value of the bSetDefaultMIB member of the DOT11_RESET_REQUEST structure. This requirement applies to a miniport driver that, in a call to the NdisMSetMiniportAttributes function, sets MiniportAttributes -> Native_802_11_Attributes -> Header -> Revision to NDIS_MINIPORT_ADAPTER_802_11_ATTRIBUTES_REVISION_1.



Available in Windows Vista and later versions of the Windows operating systems.


Windot11.h (include Ndis.h)

See also

Native 802.11 MIB OIDs

Native 802.11 Wireless LAN OIDs

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