| 主权项 |
1. A method for communicating in a local area network over an operating bandwidth using an orthogonal frequency division multiple access (OFDMA) scheme, the method comprising:
receiving a request frame from an access point (AP), the request frame received at a first instant; wherein the request frame requests transmission of a physical layer protocol data unit (PPDU) and indicates whether clear channel assessment (CCA) should be performed before the transmission of the PPDU; performing clear channel assessment over at least one sub-channel to determine whether the sub-channel is idle, the clear channel assessment performed within a predetermined period of time following the first instant; and transmitting, if all of the sub-channels for which clear channel assessments were performed are idle, a responsive PPDU, the responsive PPDU transmitted over all of the sub-channels for which clear channel assessment were performed. |
