Patent ID: 9215055
Filing Date: 2015-12-15
Classification: H04L,H04W

Abstract:
1. A method for simultaneous communication in a wireless local area network that includes a first communication device and multiple second communication devices, the method comprising: allocating, by the first communication device, respective sub-channels of an orthogonal frequency division multiplexing (OFDM) channel to two or more of the second communication devices; transmitting a first control frame to the two or more second communication devices, wherein the first control frame indicates that the two or more second communication devices are requested to transmit a second control frame to the first communication device; receiving, at the first communication device from at least some of the two or more second communication devices, respective second control frames, wherein the second control frames are transmitted by the at least some of the two or more second communication devices in the respective sub-channels allocated to the at least some of the two or more second communication devices, and wherein a second control frame transmitted by a particular second communication device indicates that at least a portion of the sub-channel allocated to the second communication device is available, and transmitting an orthogonal frequency division multiple access (OFDMA) data unit, wherein the OFDMA data unit includes respective OFDM data units transmitted to the at least some of the two or more second communication devices, wherein each OFDM data unit is transmitted to a particular one of the second communication devices in the at least the portion of the sub-channel allocated to the second communication device and indicated to be available by the second control frame received from the second communication device.