WO2014003471A1 - 무선랜 시스템에서 액세스 포인트의 검색 방법 - Google Patents
무선랜 시스템에서 액세스 포인트의 검색 방법 Download PDFInfo
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- WO2014003471A1 WO2014003471A1 PCT/KR2013/005732 KR2013005732W WO2014003471A1 WO 2014003471 A1 WO2014003471 A1 WO 2014003471A1 KR 2013005732 W KR2013005732 W KR 2013005732W WO 2014003471 A1 WO2014003471 A1 WO 2014003471A1
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- beacon
- access point
- probe response
- response frame
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
Definitions
- the present invention relates to a method for searching for an access point, and more particularly, to a method for searching for an access point using an active search method in a WLAN system.
- wireless local area network is based on radio frequency technology such as personal digital assistant (PDA), laptop computer, portable multimedia player (PMP), etc. It is a technology that allows a user to access the Internet wirelessly at home, a business, or a specific service area by using a portable terminal.
- PDA personal digital assistant
- PMP portable multimedia player
- IEEE 802.11a provides a transmission rate of 54 Mbps using an unlicensed band at 5 GHz.
- IEEE 802.11b applies a direct sequence spread spectrum (DSSS) at 2.4 GHz to provide a transmission rate of 11 Mbps.
- IEEE 802.11g applies orthogonal frequency division multiplexing (OFDM) at 2.4 GHz to provide a transmission rate of 54 Mbps.
- IEEE 802.11n applies multiple input multiple output OFDM (MIMO-OFDM) to provide a transmission rate of 300 Mbps for two spatial streams.
- IEEE 802.11n supports a channel bandwidth of up to 40 MHz, in which case it provides a transmission rate of 600 Mbps.
- VHT Very high throughput
- IEEE 802.11ac is being developed as a standard for providing very high throughput in the band below 5 GHz
- IEEE 802.11ad is being developed as a standard for providing very high throughput in the 60 GHz band.
- a search method of an access point includes an active scan method and a passive scan method.
- the station transmits a probe request frame and the access point receiving the response responds with a probe response frame.
- a probe response frame contains a lot of information and occupies a radio channel for a long time.
- probe request frames of each terminal cause generation of a large number of probe response frames, and these probe response frames occupy a radio channel while competing with each other. For this reason, it is difficult for the terminal to receive the probe response frame from the desired access point within a short time, and to receive the probe response frame of the unwanted access point to maintain the waking state in order to receive the desired probe response frame.
- the terminal since the terminal does not know which channel the desired access point exists in, the above access point searching process should be performed sequentially for each channel. In this case, the terminal waits long enough to receive a probe response frame of the desired access point. Move to another channel.
- An object of the present invention for solving the above problems is to provide an active search method performed in a terminal for performing an active search using a probe response frame including only information necessary to search for an access point.
- Another object of the present invention for solving the above problems is to provide an active search method performed in an access point for performing an active search using a probe response frame including only information necessary to search for an access point. .
- an active scanning method which includes transmitting a probe request frame to an access point, and generating a probe response frame corresponding to the probe request frame from the access point. And receiving the probe response frame, wherein the probe response frame includes time information of a beacon transmitted from the access point after the probe response frame.
- the active searching method may further include receiving a beacon from the access point at a time indicated by the time information of the beacon.
- the terminal may operate in a power saving mode for a time from receiving the probe response frame to a time point indicated by time information of the beacon.
- the terminal may search for an access point in another channel for a time from receiving the probe response frame to a time point indicated by the time information of the beacon.
- the time information may include period information up to the time when the beacon is transmitted.
- the time information may include time point information at which the beacon is transmitted.
- the time information may include time information of the next full beacon or time information of the next short beacon.
- the probe response frame may be a short probe response frame.
- An active search response method of an access point for achieving the other object, receiving a probe request frame from the terminal, generating a probe response frame in response to the probe request frame, and And transmitting the probe response frame to the terminal, wherein the probe response frame includes time information of a beacon transmitted after the probe response frame.
- the method may further include transmitting a beacon at a time indicated by the time information of the beacon.
- the time information may include period information up to the time when the beacon is transmitted.
- the time information may include time point information at which the beacon is transmitted.
- the time information may include time information of the next full beacon or time information of the next short beacon.
- the probe response frame may be a short probe response frame.
- a probe response frame i.e., a short probe response frame or a probe ACK
- the time required for the wireless channel to be occupied by the probe response frame can be reduced. Can improve the efficiency.
- the terminal may know the transmission time of the beacon through the time information of the next beacon included in the probe response frame, and based on this, the terminal may perform an access point search on another channel until the transmission of the next beacon. You can reduce the time spent searching.
- FIG. 1 is a conceptual diagram illustrating an embodiment of a configuration of an IEEE 802.11 WLAN system.
- FIG. 2 is a conceptual diagram illustrating a connection process of a terminal in an infrastructure BSS.
- FIG. 3 is a conceptual diagram illustrating an embodiment of a data transmission process of an access point.
- FIG. 4 is a conceptual diagram illustrating an active search method in multiple channels.
- 5 is a conceptual diagram illustrating a manual search method in multiple channels.
- FIG. 6 is a flowchart illustrating an active search method according to an embodiment of the present invention.
- FIG. 7 is a conceptual diagram illustrating an active search method according to an embodiment of the present invention.
- first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
- the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
- a station is a physical layer for medium access control (MAC) and wireless medium that conforms to the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard. By any functional medium that includes an interface.
- the station STA may be divided into a station that is an access point (AP) and a station that is a non-access point (STA).
- a station (STA), which is an access point (AP), may simply be called an access point (AP), and a station (STA), which is a non-AP, may simply be called a terminal.
- the station STA may include a processor and a transceiver, and may further include a user interface and a display device.
- a processor refers to a unit designed to generate a frame to be transmitted through a wireless network or to process a frame received through a wireless network, and performs various functions for controlling a station (STA).
- a transceiver is a unit that is functionally connected to a processor and is designed to transmit and receive a frame through a wireless network for a station (STA).
- An access point may refer to a centralized controller, a base station (BS), a node-B, an e-node-B, a base transceiver system (BTS), or a site controller, and the like. Some or all of the features may be included.
- BS base station
- BTS base transceiver system
- the terminal may be a wireless transmit / receive unit (WTRU), a user equipment (UE), a user terminal (UT), an access terminal (AT), a mobile station (MS), May refer to a mobile terminal, a subscriber unit, a subscriber station (SS), a wireless device, or a mobile subscriber unit, and some of them. Or all of the functions may be included.
- WTRU wireless transmit / receive unit
- UE user equipment
- UT user terminal
- AT access terminal
- MS mobile station
- SS subscriber station
- wireless device or a mobile subscriber unit, and some of them. Or all of the functions may be included.
- a desktop computer a laptop computer, a tablet PC, a wireless phone, a mobile phone, a smart phone, and an e-communication capable of communicating with a terminal
- book readers portable multimedia players (PMPs), portable game consoles, navigation devices, digital cameras, digital multimedia broadcasting (DMB) players, digital audio recorders, digital audio players ),
- DMB digital multimedia broadcasting
- a digital picture recorder, a digital picture player, a digital video recorder, a digital video player, and the like can be used.
- FIG. 1 is a conceptual diagram illustrating an embodiment of a configuration of an IEEE 802.11 WLAN system.
- an IEEE 802.11 WLAN system includes at least one basic service set (BSS).
- BSS means a set of stations (STA 1, STA 2 (AP 1), STA 3, STA 4, STA 5 (AP 2)) that can be successfully synchronized to communicate with each other, the concept of a specific area is no.
- BSS can be classified into Infrastructure BSS (Independent BSS) and Independent BSS (IBSS), and BSS 1 and BSS 2 represent Infrastructure BSS.
- BSS 1 connects a terminal (STA 1), an access point (STA 2 (AP 1)) providing a distribution service and a plurality of access points (STA 2 (AP 1), STA 5 (AP 2)) It may include a distribution system (DS).
- STA 2 an access point STA 2 (AP 1) manages a terminal STA 1.
- BSS 2 connects a terminal (STA 3, STA 4), an access point (STA 5 (AP 2)) providing a distribution service and a plurality of access points (STA 2 (AP 1), STA 5 (AP 2)) It may include a distribution system.
- an access point STA 5 (AP 2) manages terminals STA 3 and STA 4.
- the independent BSS is a BSS operating in an ad-hoc mode. Since the IBSS does not include an access point, there is no centralized management entity. That is, in the IBSS, terminals are managed in a distributed manner. In IBSS, all terminals may be mobile terminals, and thus, are not allowed to be connected to the distribution system (DS), thereby forming a self-contained network.
- DS distribution system
- the access points STA 2 (AP 1) and STA 5 (AP 2) provide access to the distributed system DS through the wireless medium for the terminals STA 1, STA 3, and STA 4 coupled thereto. .
- Communication between terminals STA 1, STA 3, and STA 4 in BSS 1 or BSS 2 is generally performed through an access point STA 2 (AP 1) or STA 5 (AP 2), but a direct link (direct link) If the link is configured, direct communication between the terminals STA 1, STA 3, and STA 4 is possible.
- the plurality of infrastructure BSSs may be interconnected through a distribution system (DS).
- DS distribution system
- a plurality of BSSs connected through a distribution system (DS) is called an extended service set (ESS).
- Stations included in the ESS may communicate with each other, and the UE may move from one BSS to another BSS while seamlessly communicating within the same ESS.
- the distribution system (DS) is a mechanism for one access point to communicate with another access point, whereby the access point transmits frames to, or moves to, another BSS for the terminals that are associated with the BSS it manages.
- a frame may be transmitted for one arbitrary terminal.
- the access point may transmit and receive frames with an external network such as a wired network.
- Such a distribution system (DS) does not necessarily need to be a network, and there is no limitation on its form as long as it can provide a predetermined distribution service defined in the IEEE 802.11 standard.
- the distribution system may be a wireless network such as a mesh network or a physical structure that connects access points to each other.
- the method for searching for an access point may be applied to the IEEE 802.11 WLAN system described above, and also, as well as an IEEE 802.11 WLAN system, a wireless personal area network (WPAN) and a wireless body area (WBAN). It can be applied to various networks such as Network).
- IEEE 802.11 WLAN system described above, and also, as well as an IEEE 802.11 WLAN system, a wireless personal area network (WPAN) and a wireless body area (WBAN). It can be applied to various networks such as Network).
- FIG. 2 is a conceptual diagram illustrating a connection process of a terminal in an infrastructure BSS.
- the terminal STA In order for the STA to transmit and receive data in the intra-structure BSS, the terminal STA must first be connected to the access point AP.
- connection process of the STA in the infrastructure BSS is largely 1) a probe step (AP), 2) an authentication step with the detected access point (AP). ) And 3) an association step with an authenticated access point (AP).
- the STA may first detect neighboring access points (APs) through a detection process.
- the detection process is divided into a passive scanning method and an active scanning method.
- the passive scanning method may be performed by overhearing beacons transmitted by neighboring access points (APs).
- the active scanning method may be performed by broadcasting a probe request frame.
- the AP that receives the probe request frame may transmit a probe response frame corresponding to the probe request frame to the corresponding STA.
- the STA may know the presence of neighboring access points (APs) by receiving a probe response frame.
- the terminal STA may perform authentication with the detected access point AP and may perform authentication with the plurality of detected access points APs.
- An authentication algorithm according to the IEEE 802.11 standard is divided into an open system algorithm for exchanging two authentication frames and a shared key algorithm for exchanging four authentication frames. Through the process of exchanging an authentication request frame and an authentication response frame based on the authentication algorithm, the terminal STA may perform authentication with the access point AP.
- the terminal STA selects one of the authenticated access points APs and performs a connection process with the selected access point AP. That is, the terminal STA transmits an association request frame to the selected access point AP, and the access point AP that receives the association request frame receives an association response frame corresponding to the association request frame. frame is transmitted to the corresponding STA. As such, through the process of exchanging the connection request frame and the connection response frame, the STA may perform a connection process with the access point AP.
- FIG. 3 is a conceptual diagram illustrating an embodiment of a data transmission process of an access point.
- the AP may broadcast a beacon periodically, and may broadcast a beacon including a DTIM at three beacon intervals.
- Terminals STA 1 and STA 2 of a power save mode (PSM) periodically wake up to receive a beacon, check the TIM or DTIM included in the beacon, and send data to the access point to the access point. Check that it is buffered. In this case, when the buffered data is present, the terminals STA 1 and STA 2 remain awake to receive data from the access point AP, and when the buffered data does not exist, the terminals STA 1 and STA 2. ) Returns to the power saving state (ie the doze state).
- PSM power save mode
- the STA (STA 1, STA 2) is a PS (Power Save) -Poll frame (notifying that it is awake and ready to receive data) Or, transmit a trigger (trigger frame) to the access point (AP), the access point (AP) confirms that the terminal (STA 1, STA 2) is ready for data reception by receiving a PS-Poll frame, Data or an acknowledgment (ACK) may be transmitted to the terminals STA 1 and STA 2.
- the access point AP transmits data to the terminals STA 1 and STA 2 at an appropriate time.
- the terminals STA 1 and STA 2 return to the power saving state.
- FIG. 4 is a conceptual diagram illustrating an active search method in multiple channels.
- the terminal may first transmit a probe request frame to a specific access point or all access points in channel 1, and may receive a probe response frame transmitted from the access point for a maximum waiting time. . That is, the terminal may receive the probe response frame 1 from the access point 1, receive the probe response frame 2 from the access point 2, and receive the probe response frame 3 from the access point 3 during the maximum waiting time in channel 1. can do.
- the terminal may move to channel 2 to transmit a probe request frame to a specific access point or all access points, and may receive a probe response frame transmitted from the access point during the maximum wait time.
- the terminal may receive the probe response frame 4 from the access point 4 during the maximum waiting time on the channel 2, may receive the probe response frame 5 from the access point 5, and receive the probe response frame 6 from the access point 6. can do.
- 5 is a conceptual diagram illustrating a manual search method in multiple channels.
- a terminal may first receive beacons transmitted from an access point, and after the beacon interval in channel 1, the terminal may move to channel 2. Thereafter, the terminal in channel 2 may receive beacons transmitted from the access point.
- FIG. 6 is a flowchart illustrating an active search method according to an embodiment of the present invention.
- the terminal 10 may first transmit a probe request frame to the access point 20 (S100).
- the terminal 10 may transmit a probe request frame by specifying an access point, or may transmit a probe request frame to an unspecified access point (ie, all access points).
- the terminal 10 may make a request for providing time information of a next beacon through a probe request frame. That is, the terminal 10 may set an arbitrary field indicating a request for providing time information of the next beacon, and generate and transmit a probe request frame including the same to the access point.
- the access point 20 may generate a probe response frame including time information of the next beacon (S110). That is, the access point 20 may generate the probe response frame including time information of the beacon transmitted after the transmission of the probe response frame. The access point 20 may generate a probe response frame including time information of a next full beacon or time information of a next short beacon (ie, auxiliary beacon).
- the full beacon means a beacon generally used in a WLAN system (IEEE 802.11).
- the short beacon is used to speed up the manual search and means a beacon having a shorter period than the full beacon and including only essential information for the search.
- the short beacon may include timestamp information, change sequence information, time of next full beacon information, compressed service set identifier (SSID) information, Access network options information and the like.
- SSID compressed service set identifier
- the time information of the next beacon may mean a duration until next beacon is transmitted or a time when the next beacon is transmitted (ie, target beacon transmission time (TBTT)).
- TBTT target beacon transmission time
- the access point 20 may generate a new probe response frame (that is, a short probe response frame or a probe ACK frame) instead of the existing probe response frame.
- the new probe response frame may have a smaller size than the existing probe response frame, and the new probe response frame may include SSID, time information of the next beacon (that is, beacon transmitted after transmission of the probe response frame) as essential information for searching. Time information).
- the access point 20 may transmit a probe response frame including the time information of the beacon to the terminal 10 (S120).
- the terminal 10 may obtain time information of the next beacon (that is, time information of the beacon transmitted after transmission of the probe response frame) from the probe response frame. There is (S130). When the time information of the next beacon indicates a period during which the next beacon is transmitted, the terminal 10 may obtain a time point at which the next beacon is transmitted based on a current time point and a period during which the next beacon is transmitted.
- the terminal 10 may return to a sleep state (ie, power saving mode) until the time point at which the next beacon is transmitted, or in another channel. You can perform the active search described in.
- the access point 20 may transmit the beacon at the time indicated by the time information of the next beacon included in the probe response frame (S140).
- the access point 20 may transmit a full beacon or a short beacon.
- the terminal 10 may receive the beacon at the time indicated by the time information of the next beacon included in the probe response frame.
- FIG. 7 is a conceptual diagram illustrating an active search method according to an embodiment of the present invention.
- the terminal may first transmit a probe request frame on channel 1 and may receive a response according to the maximum waiting time. That is, the terminal may receive probe response frame 1 (ie, probe ACK 1) from access point 1 during the maximum waiting time on channel 1, and receive probe response frame 2 (ie, probe ACK 2) from access point 2. And receive probe response frame 3 (ie, probe ACK 3) from access point 3.
- probe response frame 1 ie, probe ACK 1
- probe response frame 2 ie, probe ACK 2
- probe response frame 3 ie, probe ACK 3
- the probe response frames 1 to 3 refer to probe response frames including time information of the next beacon described with reference to FIG. 6. That is, since the probe response frames 1 to 3 have a smaller size than the existing probe response frames, the maximum wait time on the channel 1 may be set to be shorter than the existing maximum wait time.
- the terminal may determine the connection target access point based on the signal strength of the probe response frame. That is, the terminal may determine an access point that transmits the probe response frame having the largest signal strength among the probe response frames 1 to 3 as an access point to be connected, or the signal strength meets a predetermined criterion among the probe response frames 1 to 3. An access point transmitting the probe response frame may be determined as the connection target access point.
- the terminal may determine the access point 1 as the access point to be connected, and based on the time information of the next beacon included in the probe response frame 1, the next beacon 1 or A transmission time of the next auxiliary beacon (aux.beacon) 1 (ie, short beacon 1) may be obtained.
- the terminal may determine to receive the beacon at the transmission time of the next beacon 1.
- the terminal may search for an access point in another channel. That is, the terminal may move to channel 2 and transmit a probe request frame.
- the terminal may receive probe response frame 4 (ie, probe ACK 4) from access point 4 and receive probe response frame 5 (ie, probe ACK 5) from access point 5 during the maximum wait time on channel 2.
- receive probe response frame 6 ie, probe ACK 6) from access point 6.
- the probe response frames 4 to 6 mean probe response frames including time information of the next beacon described with reference to FIG. 6. That is, since the probe response frames 4 to 6 have a smaller size than the existing probe response frames, the maximum wait time on the channel 2 may be set to be shorter than the existing maximum wait time.
- the terminal may determine the connection target access point based on the signal strength of the probe response frame. For example, when the signal strength of the probe response frame 6 is the largest among the probe response frames 4 to 6, the terminal may determine the access point 6 as the access point to be connected and time information of the next beacon included in the probe response frame 6. Based on the transmission time of the next beacon 6 or the next auxiliary beacon 6 can be obtained. Here, the terminal may determine to receive the beacon at the transmission time of the next beacon 6.
- the terminal may search for an access point in another channel. That is, the terminal may move to channel 3 and transmit a probe request frame.
- the terminal may receive probe response frame 7 (ie, probe ACK 7) from access point 7 and receive probe response frame 8 (ie, probe ACK 8) from access point 8 during the maximum wait time on channel 3.
- receive probe response frame 9 ie, probe ACK 9) from access point 9.
- the probe response frames 7 to 9 mean probe response frames including time information of the next beacon described with reference to FIG. 6. That is, since the probe response frames 7 to 9 have a smaller size than the existing probe response frames, the maximum wait time on the channel 3 may be set to be shorter than the existing maximum wait time.
- the terminal may determine the connection target access point based on the signal strength of the probe response frame. For example, when the signal strength of the probe response frame 9 is the largest among the probe response frames 7 to 9, the terminal may determine the access point 9 as an access point to be connected and time information of the next beacon included in the probe response frame 9. Based on the transmission time of the next beacon 9 or the next auxiliary beacon 9 can be obtained.
- the terminal may determine to receive the auxiliary beacon at the transmission time of the auxiliary beacon 9 having a lower priority than the beacon 9.
- the terminal may move to channel 1 and receive beacon 1 at the transmission point of beacon 1, Thereafter, the terminal may move to channel 2 to receive the beacon 6 at the transmission time of the beacon 6, and then the terminal may move to the channel 3 to receive the auxiliary beacon 9 at the transmission time of the auxiliary beacon 9.
Abstract
Description
Claims (14)
- 단말에서 수행되는 능동 검색 방법으로서,프로브 요청 프레임(probe request frame)을 액세스 포인트(access point)에 전송하는 단계; 및상기 액세스 포인트로부터 상기 프로브 요청 프레임에 대응된 프로브 응답 프레임(probe response frame)을 수신하는 단계를 포함하되,상기 프로브 응답 프레임은, 상기 프로브 응답 프레임 이후에 상기 액세스 포인트로부터 전송되는 비컨(beacon)의 시간 정보를 포함하는 것을 특징으로 하는 능동 검색 방법.
- 청구항 1에 있어서,상기 능동 검색 방법은,상기 비컨의 시간 정보가 나타내는 시점에서 상기 액세스 포인트로부터 비컨을 수신하는 단계를 더 포함하는 것을 특징으로 하는 능동 검색 방법.
- 청구항 2에 있어서,상기 단말은, 상기 프로브 응답 프레임을 수신한 후부터 상기 비컨의 시간 정보가 나타내는 시점까지의 시간 동안, 전력 절감 모드로 동작하는 것을 특징으로 하는 능동 검색 방법.
- 청구항 2에 있어서,상기 단말은, 상기 프로브 응답 프레임을 수신한 후부터 상기 비컨의 시간 정보가 나타내는 시점까지의 시간 동안, 다른 채널에서 액세스 포인트의 검색을 수행하는 것을 특징으로 하는 능동 검색 방법.
- 청구항 1에 있어서,상기 시간 정보는 상기 비컨이 전송되는 시점까지의 기간(duration) 정보를 포함하는 것을 특징으로 하는 능동 검색 방법.
- 청구항 1에 있어서,상기 시간 정보는 상기 비컨이 전송되는 시점 정보를 포함하는 것을 특징으로 하는 능동 검색 방법.
- 청구항 1에 있어서,상기 시간 정보는 다음 풀(full) 비컨의 시간 정보 또는 다음 숏(short) 비컨의 시간 정보를 포함하는 것을 특징으로 하는 능동 검색 방법.
- 청구항 1에 있어서,상기 프로브 응답 프레임은 숏(short) 프로브 응답 프레임인 것을 특징으로 하는 능동 검색 방법.
- 액세스 포인트(access point)의 능동 검색 응답 방법으로서,프로브 요청 프레임(probe request frame)을 단말로부터 수신하는 단계;상기 프로브 요청 프레임의 응답으로 프로브 응답 프레임(probe response frame)을 생성하는 단계; 및상기 프로브 응답 프레임을 상기 단말에 전송하는 단계를 포함하되,상기 프로브 응답 프레임은, 상기 프로브 응답 프레임 이후에 전송하는 비컨(beacon)의 시간 정보를 포함하는 것을 특징으로 하는 능동 검색 응답 방법.
- 청구항 9에 있어서,상기 능동 검색 응답 방법은,상기 비컨의 시간 정보가 나타내는 시점에서 비컨을 전송하는 단계를 더 포함하는 것을 특징으로 하는 능동 검색 응답 방법.
- 청구항 9에 있어서,상기 시간 정보는 상기 비컨이 전송되는 시점까지의 기간(duration) 정보를 포함하는 것을 특징으로 하는 능동 검색 응답 방법.
- 청구항 9에 있어서,상기 시간 정보는 상기 비컨이 전송되는 시점 정보를 포함하는 것을 특징으로 하는 능동 검색 응답 방법.
- 청구항 9에 있어서,상기 시간 정보는 다음 풀(full) 비컨의 시간 정보 또는 다음 숏(short) 비컨의 시간 정보를 포함하는 것을 특징으로 하는 능동 검색 응답 방법.
- 청구항 9에 있어서,상기 프로브 응답 프레임은 숏(short) 프로브 응답 프레임인 것을 특징으로 하는 능동 검색 응답 방법.
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JP2015520041A JP6106270B2 (ja) | 2012-06-28 | 2013-06-27 | 無線lanシステムでアクセスポイントの検索方法 |
US14/411,320 US9986491B2 (en) | 2012-06-28 | 2013-06-27 | Method for scanning for access points in wireless LAN system |
CN201380034804.7A CN104521288B (zh) | 2012-06-28 | 2013-06-27 | 在无线局域网系统中搜寻接入点的方法 |
US15/965,247 US10492129B2 (en) | 2012-06-28 | 2018-04-27 | Method for scanning for access points in wireless LAN system |
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KR1020130058167A KR101561115B1 (ko) | 2012-06-07 | 2013-05-23 | 무선랜 시스템에서 액세스 포인트의 검색 방법 |
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US14/411,320 A-371-Of-International US9986491B2 (en) | 2012-06-28 | 2013-06-27 | Method for scanning for access points in wireless LAN system |
US15/965,247 Continuation US10492129B2 (en) | 2012-06-28 | 2018-04-27 | Method for scanning for access points in wireless LAN system |
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