Patent ID: 7688769

Claim:
A method of receiving an allocated transmission period in a frame period in a wireless network system, the method comprising: receiving from an access point (AP) a first power save multi-poll (PSMP) frame allocating a downlink period and an uplink period; receiving data from the AP during the downlink period and transmitting data to the AP during the uplink period; receiving a subsequent PSMP frame allocating at least one of an additional downlink period and an additional uplink period from the AP after the downlink and uplink periods; and retransmitting data to the AP during the additional uplink period in response to there being data to be retransmitted, and receiving data retransmitted from the AP during the additional downlink period in response to there being data to be retransmitted from the AP, wherein the subsequent PSMP frame is an additional PSMP frame to follow the first PSMP frame in the frame period having a periodic duration.