OID_DOT11_ATIM_WINDOW

When set, the OID_DOT11_ATIM_WINDOW object identifier (OID) requests that the miniport driver set the value of the announcement traffic information message (ATIM) window to the specified value.

When queried, OID_DOT11_ATIM_WINDOW requests that the miniport driver return the value of the ATIM window.

The data type for this OID is a ULONG value that specifies the ATIM window in 802.11 time units (TU). One TU is 1024 microseconds.

The ATIM window is a short time period immediately following the transmission of each 802.11 Beacon frame in an independent basic service set (IBSS) network. During the ATIM window, any station in the IBSS network can indicate the need to transfer data to another station during the next data transmission window.

Note  IBSS (Ad hoc) and SoftAP are deprecated. Starting with Windows 8.1 and Windows Server 2012 R2, use Wi-Fi Direct.

If the miniport driver is operating in the Extensible Station (ExtSTA) mode, it fails a set request of OID_DOT11_ATIM_WINDOW under the following conditions:

  • The 802.11 station does not support 802.11 ATIM windows. In this situation, the miniport driver returns NDIS_STATUS_NOT_SUPPORTED from its MiniportOidRequest function.

  • The desired basic service set (BSS) type had not previously been set to dot11_BSS_type_independent through a set of OID_DOT11_DESIRED_BSS_TYPE. In this situation, the miniport driver returns NDIS_STATUS_INVALID_DATA from its MiniportOidRequest function.

  • The beacon period was not previously initialized through a set of OID_DOT11_BEACON_PERIOD. In this situation, the miniport driver returns NDIS_STATUS_INVALID_DATA from its MiniportOidRequest function.

  • The specified ATIM window is less than the target beacon transmission time (TBTT). In this situation, the miniport driver returns NDIS_STATUS_INVALID_DATA from its MiniportOidRequest function.

When queried, the OID_DOT11_ATIM_WINDOW OID requests that the miniport driver return the value of the ATIM window. If the desired BSS type is not dot11_BSS_type_independent, the miniport driver must fail the query request by returning NDIS_STATUS_INVALID_DATA from its MiniportOidRequest function.

Requirements

Version

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

Header

Windot11.h (include Ndis.h)

See also

Native 802.11 Wireless LAN OIDs

 

 

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