METHOD AND SYSTEM FOR SOUNDING AND CHANNEL SELECTION

摘要

Methods and apparatus may be used for sounding for multi-user (MU) scheduling and for signaling and procedures for sub-channel selection. A wireless transmit/receive unit (WTRU) may receive information from an access point (AP) indicating a plurality of sub-channels to use for uplink data transmission as part of uplink MU wireless communications using a carrier sense multiple access (CSMA) wireless medium. The WTRU may transmit, using a plurality of sub-channels, a Physical Layer Convergence Protocol (PLCP) Protocol Data Unit (PPDU) including a preamble portion and a data portion, and, using at least a subset of the plurality of sub-channels, sounding signals to the AP for scheduling MU communications. The AP may receive sounding information from more WTRUs that the plurality of WTRUS associated with the scheduling information for the uplink data transmission during a time interval, in addition to receiving uplink data from the plurality of WTRUs.