Patent application number | Description | Published |
20110188429 | POWER MANAGEMENT IN TUNNELED DIRECT LINK SETUP - A method and apparatus of managing power save in a wireless network is provided. A direct link with a peer station (STA) is established by exchanging a Tunneled Direct Link Setup (TDLS) setup request frame and a TDLS setup response frame through a access point (AP). The peer STA enters power save mode (PSM). Traffic data that are destined for the peer STA in the PSM are buffered and a peer traffic indication (PTI) frame is transmitted to the peer STA in the PSM. The PTI frame includes a traffic identifier (TID) field and a sequence control field. Unnecessary allocation of service period can be prevented. | 08-04-2011 |
20120106531 | METHOD AND APPARATUS FOR INDICATING DESTINATION STATIONS IN WLAN SYSTEM SUPPORTING MULTI-USER MULTIPLE INPUT MULTIPLE OUTPUT - A method of indicating destination stations, performed by an access point (AP), in a wireless local area network (WLAN) system supporting multi-user multiple input multiple output (MU-MIMO) is provided. The method includes transmitting a sounding request frame to the plurality of destination stations to transmit a sounding frame used for channel estimation between the AP and each destination station, receiving the sounding frame in response to the sounding frame request from each station, and transmitting a first data frame spatially multiplexed with respect to the plurality of destination stations by performing channel estimation on the basis of the sounding frame, wherein the sounding request frame comprises a group identifier (ID) indicating the plurality of destination stations. | 05-03-2012 |
20120165056 | METHOD AND APPARATUS FOR ACQUIRING AVAILABLE CHANNEL INFORMATION IN A WIRELESS LOCAL AREA NETWORK SYSTEM - Methods and apparatuses for acquiring/providing available channel information using Generic Advertisement Service (GAS) protocol in a wireless local area network (WLAN) are disclosed. AP (Access Point) station has a capability to acquire information for available channels from a database using a specific protocol related to an operation within the White Space (e.g. Access Network Query Protocol (ANQP)). And, non-AP station can retrieve the information for available channels by transmitting a Generic Advertisement Service (GAS) initial request frame to the AP station, wherein the GAS initial request frame comprises an Advertisement Protocol Element whose element ID indicates the specific protocol, and receiving a GAS initial response frame comprising a White Space Map (WSM) the specific protocol. The WSM comprises one or more white space channel units, and each of the white space channel units comprises a channel number field indicating one of the available channels and a power constraint field indicating a maximum allowable power on the indicated channel. | 06-28-2012 |
20120307685 | Method and Apparatus of Active Scanning in Wireless Local Area Network - Disclosed are a method and apparatus for active scanning of a station in a wireless local area network (WLAN), the method for active scanning in a wireless local area network (WLAN), the method including: receiving a probe request frame including probe request relaying information from a probe requesting station (STA) initiating the active scanning; determining whether to relay the the probe request frame; and relaying the probe request frame to an access point (AP) if it is determined to relay the probe request frame, the probe request relaying information including a transmitter address field that indicates an address of an STA transmitting the probe request frame, and a probe requesting STA address field that indicates an address of the probe requesting STA. With this imbalance between scanning coverage and service coverage in a TV WS is solved to thereby more efficiently perform scanning. | 12-06-2012 |
20130142132 | Method and Apparatus for Receiving Available Channel Information in a Wireless LAN System - The present invention relates to a method and apparatus for receiving available channel information in a wireless LAN system. According to one aspect of the present invention, in a method in which a first station (STA) receives available channel information in a wireless LAN system, wherein the first station operates as an unlicensed device that is allowed to operate in an available channel not used by a licensed device in a white space band, the first station receives, from a second station, a frame including an operating class field, a channel number field and a maximum transmission power field, and operates in the channel indicated by the operating class field and the channel number field, wherein said operating class field and said channel number field indicate the available channel which can be used by the unlicensed device, and said maximum transmission power field indicates the maximum transmission power permitted in the available channel. | 06-06-2013 |
20130201928 | Method and Apparatus for Receiving Available Channel Information in a Wireless Lan System - The present invention relates to a method and apparatus for receiving a white space map in a wireless LAN system. According to one aspect of the present invention, in a method in which a first station (STA) receives a white space map in a wireless LAN system, wherein the first station operates as an unlicensed device that is allowed to operate in an available channel not used by a licensed device in a white space band, the first station receives, from a second station, a frame including the white space map which includes a black list and a first field for indicating that the white space map contains the black list, and operates in at least one channel from the rest of the channels in TVWS, excluding the channel contained in the black list, wherein the black list is a list of channels which cannot be used by the unlicensed device. | 08-08-2013 |
20130250833 | METHOD FOR POWER SAVE MODE OPERATION IN WIRELESS LOCAL AREA NETWORK AND APPARATUS FOR THE SAME - A method for a power save mode operation in a wireless local area network (WLAN) system is provided. The method comprising determining a type of a receiving station (STA) indicator on the basis of the number of STAs which are associated with the AP and which intend to transmit buffered traffic; generating a traffic indicator map (TIM) element including information which indicates the receiving STA indicator and the type of the receiving STA indicator, transmitting the TIM element, receiving a poll frame for requesting data frame transmission from one STA among the STAs and transmitting the data frame to the STA. | 09-26-2013 |
20140087778 | METHOD AND APPARATUS FOR ACQUIRING AVAILABLE CHANNEL INFORMATION IN A WIRELESS LOCAL AREA NETWORK SYSTEM - Methods and apparatuses for acquiring/providing available channel information using Generic Advertisement Service (GAS) protocol in a wireless local area network (WLAN) are disclosed. AP (Access Point) station has a capability to acquire information for available channels from a database using a specific protocol related to an operation within the White Space (e.g. Access Network Query Protocol (ANQP)). And, non-AP station can retrieve the information for available channels by transmitting a Generic Advertisement Service (GAS) initial request frame to the AP station, wherein the GAS initial request frame comprises an Advertisement Protocol Element whose element ID indicates the specific protocol, and receiving a GAS initial response frame comprising a White Space Map (WSM) the specific protocol. The WSM comprises one or more white space channel units, and each of the white space channel units comprises a channel number field indicating one of the available channels and a power constraint field indicating a maximum allowable power on the indicated channel. | 03-27-2014 |
20140105133 | METHOD AND APPARATUS FOR PROTECTING A PRIMARY SERVICE IN WLAN SYSTEM - A method and an apparatus for protecting a primary service as an unlicensed device in a regulatory domain where a licensed device and the unlicensed device are permitted to operate are disclosed. For protecting a primary service by a station as an unlicensed device in a regulatory domain where a licensed device and the unlicensed device are permitted to operate, the unlicensed device acquires a list of identified available channels for the operation of the unlicensed device and maximum allowed transmission powers of the identified available channels from a regulatory domain database system; generates a white space map (WSM) comprising the list of identified available channels and the maximum allowed transmission powers of the identified available channels; updates the WSM when the station acquires information that a primary service signal is detected on a specific channel which is indicated as available in the WSM; and transmits the updated WSM to another station such that the another station moves to another channel if the another station is operating on the specific channel. | 04-17-2014 |
20140321379 | Method and Apparatus for Multi-Channel Operation in Wireless Local Area Network System - Disclosed are a method and apparatus for multi-channel operation, performed by an access point (AP), in a WLAN system, the method includes: transmitting channel assignment information to a plurality of stations (STAs), in which the channel assignment information is for assigning at least one of a first channel and a second channel to each of the plurality of STAs; transmitting channel activity information to the plurality of STAs, in which the channel activity information is for indicating an activity duration where the AP transmit or receive a frame through each of the first channel and the second channel; and transmitting or receiving a frame through the first channel or the second channel on the basis of the channel activity information. | 10-30-2014 |
20140321415 | METHOD AND APPARATUS FOR TRANSMITTING CHANNEL SWITCHING INFORMATION - Disclosed are a method and an apparatus for transmitting a channel switching information. A method for transmitting switching information of an operating channel may comprises the step of: receiving a candidate channel frame including channel switch candidate information through the operating channel, and preferentially scanning a candidate operation channel induced based on the channel switch candidate information if the operating channel is changed, wherein the candidate operation channel may be a channel having a possibility of being preferentially selected when the operating channel is changed to another channel. As a result, when an access point (AP) shifts the operating channel, the shifted channel can be quickly scanned and associated with AP. | 10-30-2014 |
20140348097 | METHOD FOR PERFORMING CHANNEL SOUNDING IN WIRELESS LAN SYSTEM AND APPARATUS FOR SUPPORTING SAME - The present invention relates to a method of performing channel sounding in a wireless LAN system. The method includes transmitting a Null Data Packet Announcement (NDPA) frame for providing notice of an NDP to be transmitted, and transmitting the NDP and receiving a feedback frame from a station (STA). The feedback frame includes channel state information created on the basis of the NDP. The NDP includes a signal field and at least one long training field (LTF) for a multiple input multiple output channel. The signal field includes a repetitive instruction subfield. The repetitive instruction subfield provides instruction on whether orthogonal frequency division multiplexing (OFDM) symbol repetition is applied to the at least one LTF. | 11-27-2014 |