Energy correction in an uplink OFDMA 802.11 channel

摘要

A station in a wireless network identifies a resource unit in a multi-user uplink transmission opportunity 340 which has been dedicated to padding data, then transmits on this resource unit to provide energy correction. The station may detect the energy transmitted during the preamble period 350 of the transmission opportunity, and transmit the energy corrective data if this energy falls below a certain threshold. The energy correction resource units may be signalled by the access point in a trigger frame 330, and may be distributed homogenously over the channel with one at the centre of the frequency band. The station may be the access point or a non-access-point station. Where the station is the access point it may comprise two antennae, the first for receiving the uplink transmission and the second for transmitting the corrective data. The scheme is intended for interference reduction in an IEEE 802.11ax WLAN, with the energy correction used to prevent legacy stations making erroneous determinations of an idle channel.