Method and apparatus of scanning in wireless local area network system
AssigneeElectronics and Telecommunications Research Institute
InventorsJae Seung LEE, Min ho CHEONG, Je Hun LEE, Ja Beom GU, Jae Woo PARK, Sok Kyu LEE
Life of this patent
Estimating the term…
Abstract
A scanning method in a wireless local area network (WLAN) system is provided. The scanning method includes transmitting by a station a probe request frame via a channel, and receiving by the station a probe response frame from a target access point (AP) to respond to the probe request frame. The probe request frame includes at least one of information regarding a response reception time and preference information regarding the target AP.
Claims20
A method of scanning a channel, performed by a station (STA), in a wireless local area network (WLAN) system, the method comprising:
- transmitting a probe request frame for scanning a channel, by a STA which has not yet associated with an access point (AP), wherein the probe request frame includes a max channel time information;
- and
- receiving, by the STA, a probe response frame from the AP,
- wherein the AP determines whether a time indicated by the max channel time information has elapsed based on the time calculated from the reception of the probe request frame,
- wherein the AP transmits the probe response frame based on a determination that the time indicated by the max channel time information has not elapsed from the reception of the probe request frame,
- wherein the AP does not transmit the probe response frame based on a determination that the time indicated by the max channel time information has elapsed from the reception of the probe request frame, and
- wherein the max channel time information indicates a maximum time to spend on scanning the channel before the STA initiates scanning a next channel.
A station (STA) in a wireless local area network (WLAN) system, the STA comprising:
- a processor;
- and
- a transmitter coupled to the processor,
- wherein the processor is configured:
- to transmit a probe request frame for scanning a channel, from a station (STA) which has not yet associated with an access point (AP), wherein the probe request frame includes a max channel time information;
- and
- to receive a probe response frame from the AP,
- wherein the AP determines whether a time indicated by the max channel time information has elapsed based on the time calculated from the reception of the probe request frame,
- wherein the AP transmits the probe response frame based on a determination that the time indicated by the max channel time information has not elapsed from the reception of the probe request frame,
- wherein the AP does not transmit the probe response frame based on a determination that the time indicated by the max channel time information has elapsed from the reception of the probe request frame, and
- wherein the max channel time information indicates a maximum time to spend on scanning the channel before the STA initiates scanning a next channel.
A method of scanning a channel, performed by a station (STA) in a wireless local area network (WLAN) system for discovering an access point with which to associate, the method comprising:
- transmitting, on a first channel, a probe request frame including information regarding a max channel time to prevent an access point (AP) from transmitting a probe response frame after the max channel time has elapsed;
- initiating, upon transmission of the probe request frame, an interval corresponding to the max channel time;
- during the interval, monitoring the first channel for receiving one or more probe response frames;
- and
- upon expiration of the interval, ceasing monitoring of probe response frames on the first channel.
Dependencies are inferred from the claim text.