Patent ID: 7869390

Claim:
A method of Power Save Multi-Poll (PSMP) communication in a wireless communication system including a wireless Access Point (AP) and one or more wireless Stations (STA)s, comprising: transmitting a PSMP frame from the AP to the STAs over a wireless channel, wherein the PSMP frame includes one or more STA info fields which specify schedules of periods for communication over the wireless channel in a PSMP sequence; detecting if the channel is idle for a certain duration; and if the channel is idle for said certain duration, then performing a PSMP recovery process, wherein the PSMP recovery process comprises: constructing a PSMP recovery frame including a modified STA info field for a selected STA scheduled in a current uplink transmission (ULT) period; the AP taking control of the channel whenever the channel is idle for said certain duration in relation to a scheduled communication period specified in the PSMP frame; and broadcasting the PSMP recovery frame from the AP over the channel.