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To minimize the cases where the Wi-Fi Direct port causes the system to operate in Multi-Channel mode, multi-channel uses cases are not as performant as single channel use cases. We recommend that the device (driver/firmware) implements ECSA. This feature should exist completely on the IHV side.
Here are the suggested driver/firmware changes.
- Support bi-directional ECSA on the Wi-Fi Direct port.
- When the device is the Group Owner and is in Multi-Channel mode:
- The driver must detect if the remote peer supports ECSA.
- If the remote peer supports ECSA, engage ECSA to move the peer into the channel configuration that yields a single channel.
- When the device is the Client and is in Multi-Channel mode:
- If an ECSA request comes from the remote peer, then support it.
- Send channel change notifications to the operating system with NDIS_STATUS_WDI_INDICATION_P2P_GROUP_OPERATING_CHANNEL.