Patent ID: 9345042
Filing Date: 2016-05-17
CPC Classification: H04L,H04W

Claim Text:
1. A method for avoiding downlink data collision, comprising: an Access point (AP) receiving a radio frame (PS-Poll) transmitted by a Station (STA) for inquiring whether the AP has one or more Bufferable Units (BUs) to be transmitted to the STA; when the AP determines that there is one or more BUs to be transmitted to the STA and a length of the one or more BUs is larger than a predetermined threshold, the AP transmitting to the STA a Request to send (RTS) frame to reserve a channel with a first channel reservation time required for transmitting data, then the AP receiving a Clear to send (CTS) frame with a second channel reservation time transmitted by the STA after the STA which transmits the PS-Poll receives the RTS frame, and the AP transmitting the one or more BUs to the STA after succeeding in reserving the channel; wherein a time cut-off point set through the first channel reservation time of the RTS frame is consistent with a cut-off point set through the second channel reservation information of the CTS frame.