METHOD AND APPARATUS FOR ACTIVE SCANNING IN WIRELESS LAN

摘要

Disclosed are a method and an apparatus for active scanning in a WLAN. In the method for active scanning in the WLAN, a scanning STA, which has received from a different STA a first probe request frame, can start a probe timer and perform a CCA for detecting a channel state of a receiving channel. When the channel state is not busy until the probe timer reaches a minimum channel time, the scanning STA transmits to an AP from the receiving channel a second probe request frame, and when the channel state is busy until the probe timer reaches the minimum channel time and the scanning STA does not receive a probe reply frame, which includes at least the same information expected to be received based on scanning information, the scanning STA can transmit to the AP from the receiving channel the second probe request frame.

主权项

1. A method for performing active scanning in a wireless local area network (LAN), the method comprising:
generating, by a scanning station (STA), scanning information for performing an active scanning; receiving, by the scanning STA, a first probe request frame via a reception channel, the first probe request frame being a frame transmitted to an access point (AP) by a STA; starting, by the scanning STA receiving the first probe request frame, a probe timer; performing, by the scanning STA, clear channel assessment (CCA) to detect a channel state in the reception channel; transmitting, by the scanning STA, a second probe request frame to the AP via the reception channel when the channel state is not busy before the probe timer reaches a minimum channel time; and transmitting, by the scanning STA, the second probe request frame to the AP in the reception channel when the channel state is busy before the probe timer reaches the minimum channel time and a probe response frame including at least the same information anticipated to be received by the scanning STA based on the scanning information is not received until the probe timer reaches a maximum channel time, wherein the first probe request frame includes a plurality of first fields and the scanning information includes a plurality of second fields, and wherein at least one field among the plurality of first fields includes information which is the same as information included in one field among the plurality of second fields.