Patent ID: 8068476

Claim:
A method of receiving, by a station (STA), 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; if the uplink period is insufficient for transmitting queued data of the STA, transmitting during the uplink period a part of the queued data and a resource request message requesting allocation of an additional resource for at least a portion of remaining queued data of the STA; receiving from the AP a subsequent PSMP frame allocating an additional uplink period after the downlink and uplink periods, wherein the subsequent PSMP frame is an additional PSMP frame following the first PSMP frame; and transmitting the at least a portion of remaining queued data to the AP during the additional uplink period.