Patent ID: 8848624

Claim:
A method for operating an access point device, the method comprising: after gaining medium access, transmitting a management frame to indicate the medium access; from a plurality of wireless communication devices, employing at least one of a plurality of antennae of the access point device for receiving, in response to the management frame, a first multi-user packet including a first plurality of signals such that each one of the first plurality of signals being from a respective one of the plurality of wireless communication devices; based on the first plurality of signals, calculating a plurality of carrier frequency offsets (CFOs) such that each one of the plurality of CFOs corresponding to a respective one of the first plurality of signals; transmitting a second multi-user packet to the plurality of wireless communication devices, wherein the second multi-user packet including the plurality of CFOs for use in synchronizing frequencies of a second plurality of signals with respect to the access point device within a third multi-user packet; and based on a plurality of capabilities of the plurality of wireless communication devices, determining a time period for the plurality of wireless communication devices transmitting the third multi-user packet to the wireless access point device.