Method and apparatus for filtering-based scanning in wlan system

Abstract

The present invention relates to a wireless communication system, and more specifically, disclosed are a method and an apparatus for filtering-based scanning in a WLAN system. A method for a station (STA) setting up a high-speed link in the wireless communication system, according to one embodiment of the present invention, comprises the steps of: transmitting a first frame comprising filtering information to at least one access point (AP); and receiving a second frame from a portion or all of the at least one AP, wherein whether to transmit the second frame can be determined on the basis of the filtering information.

1 . A method for performing, by a station (STA), fast link setup in a wireless communication system, comprising:
 transmitting, to one or more access points (APs), a probe request frame including filtering information; and   receiving, from a portion or all of the APs, a probe response frame,   wherein the filtering information includes a received signal strength limit value,   wherein the portion or all of the APs transmitting the probe response frame include an AP having a received signal strength of the probe request frame, and   wherein whether the probe response frame is transmitted by the portion or all of the APs is determined by comparing the received signal strength limit value included in the filtering information and the received signal strength of the probe request frame.   
     
     
         2 . The method according to  claim 1 , wherein the filtering information includes charging type information. 
     
     
         3 . The method according to  claim 1 , wherein the portion or all of the APs include an AP conforming to a charging policy matching the charging type information. 
     
     
         4 . The method according to  claim 1 , wherein an AP not satisfying conditions according to the filtering information defers transmission of the probe response frame. 
     
     
         5 . The method according to  claim 4 , wherein configuration information about a time for which transmission of the probe response frame is deferred is included in the probe request frame. 
     
     
         6 . The method according to  claim 1 , wherein the probe request frame is broadcast to the one or more APs. 
     
     
         7 . A method for supporting, by an AP, fast link setup in a wireless communication system, comprising:
 receiving a probe request frame including filtering information from an STA; and   transmitting a probe response frame to the STA,   wherein the filtering information includes a received signal strength limit value,   wherein the portion or all of the APs transmitting the probe response frame include an AP having a received signal strength of the probe request frame, and   wherein whether the probe response frame is transmitted by the portion or all of the APs is determined by comparing the received signal strength limit value included in the filtering information and the received signal strength of the probe request frame.   
     
     
         8 . An STA performing fast link setup in a wireless communication system, comprising:
 a transceiver; and   a processor,   wherein the processor is configured to:   transmit, to one or more APs, a probe request frame including filtering information using the transceiver, and   receive, from a portion or all of the APs, a probe response frame using the transceiver,   wherein the filtering information includes a received signal strength limit value,   wherein the portion or all of the APs transmitting the probe response frame include an AP having a received signal strength of the probe request frame, and   wherein whether the probe response frame is transmitted by the portion or all of the APs is determined by comparing the received signal strength limit value included in the filtering information and the received signal strength of the probe request frame.   
     
     
         9 . An AP supporting fast link setup in a wireless communication system, comprising:
 a transceiver;   a processor,   wherein the processor is configured to:   receive a probe request frame including filtering information from an STA using the transceiver, and   transmit a probe response frame to the STA using the transceiver,   wherein the filtering information includes a received signal strength limit value,   wherein the portion or all of the APs transmitting the probe response frame include an AP having a received signal strength of the probe request frame, and wherein whether the probe response frame is transmitted by the portion or all of the APs is determined by comparing the received signal strength limit value included in the filtering information and the received signal strength of the probe request frame.