OID_802_11_LATENCY_SENSITIVE_MODE (Windows Embedded CE 6.0)

1/6/2010

This OID notifies the NIC driver of the presence or absence of latency sensitive traffic being transmitted or received through the NIC driver. This OID is not mandatory, but its implementation is recommended. The data type associated with this OID is specified by the NDIS_802_11_LSM_PARAMETERS, which contains the NDIS_802_11_LSM_MODE data structure. The possible Ndis802_11LSMOn and Ndis802_11LSMOff values of the NDIS_802_11_LSM_MODE data structure control whether or not the NIC is notified of latency sensitive traffic.

When set, this OID sets the current NDIS_802_11_LSM_PARAMETERS data structure

When queried, this OID returns the current NDIS_802_11_LSM_PARAMETERS data structure

Remarks

NDIS_STATUS_NOT_SUPPORTED will be returned if the NIC does not support this OID. Other NDIS status values for specific error cases may be returned as described below.

When this OID is set with the Ndis802_11LSMOn value, the NIC driver is notified that latency sensitive traffic is going to be transmitted over the link and it is requested to start operating in LSMOn mode. This implies that the NIC driver needs to adjust its behavior in order to minimize packet latency, for example, to start or adjust a proactive background scan. This set OID request may or may not be honored, depending on which state the NIC driver is in at the moment of the call.

When this OID is set with the Ndis802_11LSMOff value, the NIC driver is notified that there is no latency sensitive traffic being transmitted or received over the link. In such a case, regardless of the media connected or media disconnected state, the set OID call should be completed with status NDIS_STATUS_SUCCESS.

The NIC driver should operate in LSMOn mode from the moment it is successfully set by the OID_802_11_LATENCY_SENSITIVE_MODE call and for as long as the connection to the current network is valid, or until the LSMOff is indicated by setting the same OID. The NIC driver must cease operating in LSMOn mode whenever it generates a media disconnected indication. In the case of an NDIS driver reset, if the NIC driver does not generate a media disconnected indication as a result of the reset request, then it should continue to operate in the same latency sensitive mode that was in effect prior to the reset command.

Requirements

See Also

Reference

802.11 Wireless LAN Object Identifiers
NDIS_802_11_LSM_PARAMETERS
NDIS_802_11_LSM_MODE

Other Resources

Network Drivers