WO2014181995A1 - 무선랜에서 액티브 스캐닝을 수행하는 방법 및 장치 - Google Patents
무선랜에서 액티브 스캐닝을 수행하는 방법 및 장치 Download PDFInfo
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- WO2014181995A1 WO2014181995A1 PCT/KR2014/003767 KR2014003767W WO2014181995A1 WO 2014181995 A1 WO2014181995 A1 WO 2014181995A1 KR 2014003767 W KR2014003767 W KR 2014003767W WO 2014181995 A1 WO2014181995 A1 WO 2014181995A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/14—Access restriction or access information delivery, e.g. discovery data delivery using user query or user detection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
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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 and apparatus for performing active scanning in a WLAN, and more particularly, to a method and apparatus for performing a quick initial link setup.
- IEEE 802.11ac is a wireless LAN technology using a 60GHz band.
- IEEE 802.11af which utilizes a TV white space (TVWS) band.
- IEEE 802.11ah utilizing the 900MHz band. They aim primarily at the expansion of extended grid Wi-Fi services, as well as smart grid and wide area sensor networks.
- the existing WLAN medium access control (MAC) technology has a problem that the initial link setup time is very long in some cases.
- the IEEE 802.11ai standardization activity has been actively performed recently.
- IEEE 802.11ai is a MAC technology that addresses the rapid authentication process to dramatically reduce the initial set-up and association time of WLAN. Standardization activities began in January 2011 as a formal task group. It became. In order to enable the fast access procedure, IEEE 802.11ai is based on AP discovery, network discovery, time synchronization function synchronization, Authentication & Association, and higher layer. Discussion of process simplification is underway in areas such as merging procedures with the Among them, procedure merging using piggyback of dynamic host configuration protocol (DHCP), optimization of full EAP (extensible authentication protocol) using concurrent IP, and efficient selective access (AP) point) Ideas such as scanning are actively discussed.
- DHCP dynamic host configuration protocol
- EAP efficient selective access
- An object of the present invention is to provide a method for performing active scanning in a WLAN.
- Still another object of the present invention is to provide an apparatus for performing active scanning in a WLAN.
- a method of performing active scanning in a wireless LAN comprising: transmitting, by a first STA, a first probe request frame to an access point (AP);
- the first STA may receive a probe response frame from the AP, wherein the probe response frame is a response to the probe request frame, wherein the first probe request frame is a fast initial link setup (FILS).
- FILS capability information Including capability information (FILS capability information), the FILS capability information may indicate whether the first STA supports fast initial link establishment.
- the STA is a radio frequency (RF) unit implemented to transmit a radio signal; And a processor selectively connected to the RF unit, wherein the processor transmits a first probe request frame to an access point and receives a probe response frame in response to the first probe request frame from the AP.
- the first probe request frame may include fast initial link setup (FILS) capability information, and the FILS capability information may indicate whether the STA supports fast initial link setup. have.
- FILS fast initial link setup
- the FILS AP may determine a method of transmitting a probe response frame. Accordingly, the FILS STA supporting the FILS may perform an initial link establishment procedure with the FILS AP quickly.
- WLAN wireless local area network
- FIG. 2 is a diagram illustrating a layer architecture of a WLAN system supported by IEEE 802.11.
- FIG. 3 is a conceptual diagram illustrating a scanning method in a WLAN.
- FIG. 4 is a conceptual diagram illustrating an authentication procedure and a combined procedure performed after a scanning procedure of an AP and an STA.
- 5 is a conceptual diagram illustrating an active scanning procedure.
- FIG. 6 is a conceptual diagram illustrating a method for transmitting a probe request frame.
- FIG. 7 is a conceptual diagram illustrating an initial link establishment procedure according to an embodiment of the present invention.
- FIG. 8 is a conceptual diagram illustrating an initial link establishment procedure according to an embodiment of the present invention.
- FIG. 9 is a conceptual diagram illustrating an initial link establishment procedure according to an embodiment of the present invention.
- FIG. 10 is a conceptual diagram illustrating a probe response frame transmission method of a FILS AP according to an embodiment of the present invention.
- FIG. 11 is a conceptual diagram illustrating a probe response frame transmission method of a FILS AP according to an embodiment of the present invention.
- FIG. 12 is a conceptual diagram illustrating a probe request frame according to an embodiment of the present invention.
- FIG. 13 is a conceptual diagram illustrating a probe request frame according to an embodiment of the present invention.
- FIG. 14 is a conceptual diagram illustrating a probe response frame transmission method according to an embodiment of the present invention.
- 15 is a conceptual diagram illustrating a probe response frame transmission method according to an embodiment of the present invention.
- 16 is a block diagram illustrating a wireless device to which an embodiment of the present invention can be applied.
- WLAN wireless local area network
- FIG. 1 shows the structure of an infrastructure BSS (Basic Service Set) of the Institute of Electrical and Electronic Engineers (IEEE) 802.11.
- BSS Basic Service Set
- IEEE Institute of Electrical and Electronic Engineers 802.11
- the WLAN system may include one or more infrastructure BSSs 100 and 105 (hereinafter, BSS).
- BSSs 100 and 105 are a set of APs and STAs such as an access point 125 and a STA1 (station 100-1) capable of successfully synchronizing and communicating with each other, and do not indicate a specific area.
- the BSS 105 may include one or more joinable STAs 105-1 and 105-2 to one AP 130.
- the BSS may include at least one STA, APs 125 and 130 that provide a distribution service, and a distribution system DS that connects a plurality of APs.
- the distributed system 110 may connect several BSSs 100 and 105 to implement an extended service set (ESS) 140 which is an extended service set.
- ESS 140 may be used as a term indicating one network in which one or several APs 125 and 230 are connected through the distributed system 110.
- APs included in one ESS 140 may have the same service set identification (SSID).
- the portal 120 may serve as a bridge for connecting the WLAN network (IEEE 802.11) with another network (for example, 802.X).
- a network between the APs 125 and 130 and a network between the APs 125 and 130 and the STAs 100-1, 105-1 and 105-2 may be implemented. However, it may be possible to perform communication by setting up a network even between STAs without the APs 125 and 130.
- a network that performs communication by establishing a network even between STAs without APs 125 and 130 is defined as an ad-hoc network or an independent basic service set (BSS).
- FIG. 1 is a conceptual diagram illustrating an IBSS.
- the IBSS is a BSS operating in an ad-hoc mode. Since IBSS does not contain an AP, there is no centralized management entity. That is, in the IBSS, the STAs 150-1, 150-2, 150-3, 155-1, and 155-2 are managed in a distributed manner. In the IBSS, all STAs 150-1, 150-2, 150-3, 155-1, and 155-2 may be mobile STAs, and access to a distributed system is not allowed, thus allowing a self-contained network. network).
- a STA is any functional medium that includes a medium access control (MAC) and physical layer interface to a wireless medium that conforms to the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard. May be used to mean both an AP and a non-AP STA (Non-AP Station).
- MAC medium access control
- IEEE Institute of Electrical and Electronics Engineers
- the STA may include a mobile terminal, a wireless device, a wireless transmit / receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile subscriber unit ( It may also be called various names such as a mobile subscriber unit or simply a user.
- WTRU wireless transmit / receive unit
- UE user equipment
- MS mobile station
- UE mobile subscriber unit
- It may also be called various names such as a mobile subscriber unit or simply a user.
- FIG. 2 is a diagram illustrating a layer architecture of a WLAN system supported by IEEE 802.11.
- FIG. 2 conceptually illustrates a PHY architecture of a WLAN system.
- the hierarchical architecture of the WLAN system may include a medium access control (MAC) sublayer 220, a physical layer convergence procedure (PLCP) sublayer 210, and a physical medium dependent (PMD) sublayer 200.
- MAC medium access control
- PLCP physical layer convergence procedure
- PMD physical medium dependent
- the PLCP sublayer 210 is implemented such that the MAC sublayer 220 can operate with a minimum dependency on the PMD sublayer 200.
- the PMD sublayer 200 may serve as a transmission interface for transmitting and receiving data between a plurality of STAs.
- the MAC sublayer 220, the PLCP sublayer 210, and the PMD sublayer 200 may conceptually include a management entity.
- the management unit of the MAC sublayer 220 is referred to as a MAC Layer Management Entity (MLME) 225, and the management unit of the physical layer is referred to as a PHY Layer Management Entity (PLME) 215.
- MLME MAC Layer Management Entity
- PLME PHY Layer Management Entity
- Such management units may provide an interface on which layer management operations are performed.
- the PLME 215 may be connected to the MLME 225 to perform management operations of the PLCP sublayer 210 and the PMD sublayer 200, and the MLME 225 may also be connected to the PLME 215 and connected to the MAC.
- a management operation of the sublayer 220 may be performed.
- SME 250 may operate as a component independent of the layer.
- the MLME, PLME, and SME may transmit and receive information between mutual components based on primitives.
- the PLCP sublayer 110 may convert the MAC Protocol Data Unit (MPDU) received from the MAC sublayer 220 according to the indication of the MAC layer between the MAC sublayer 220 and the PMD sublayer 200. Or a frame coming from the PMD sublayer 200 to the MAC sublayer 220.
- the PMD sublayer 200 may be a PLCP lower layer to perform data transmission and reception between a plurality of STAs over a wireless medium.
- the MAC protocol data unit (MPDU) delivered by the MAC sublayer 220 is called a physical service data unit (PSDU) in the PLCP sublayer 210.
- the MPDU is similar to the PSDU. However, when an A-MPDU (aggregated MPDU) that aggregates a plurality of MPDUs is delivered, the individual MPDUs and the PSDUs may be different from each other.
- the PLCP sublayer 210 adds an additional field including information required by the physical layer transceiver in the process of receiving the PSDU from the MAC sublayer 220 to the PMD sublayer 200.
- the added field may include a PLCP preamble, a PLCP header, and tail bits required to return the convolutional encoder to a zero state in the PSDU.
- the PLCP preamble may serve to prepare the receiver for synchronization and antenna diversity before the PSDU is transmitted.
- the data field may include a coded sequence encoded with a padding bits, a service field including a bit sequence for initializing a scraper, and a bit sequence appended with tail bits in the PSDU.
- the encoding scheme may be selected from either binary convolutional coding (BCC) encoding or low density parity check (LDPC) encoding according to the encoding scheme supported by the STA receiving the PPDU.
- BCC binary convolutional coding
- LDPC low density parity check
- the PLCP header may include a field including information on a PLC Protocol Data Unit (PPDU) to be transmitted.
- the PLCP sublayer 210 adds the above-described fields to the PSDU, generates a PPDU (PLCP Protocol Data Unit), and transmits it to the receiving station via the PMD sublayer 200, and the receiving station receives the PPDU to receive the PLCP preamble and PLCP. Obtain and restore information necessary for data restoration from the header.
- PPDU PLCP Protocol Data Unit
- FIG. 3 is a conceptual diagram illustrating a scanning method in a WLAN.
- a scanning method may be classified into passive scanning 300 and active scanning 350.
- the passive scanning 300 may be performed by the beacon frame 330 periodically broadcasted by the AP 300.
- the AP 300 of the WLAN broadcasts the beacon frame 330 to the non-AP STA 340 every specific period (for example, 100 msec).
- the beacon frame 330 may include information about the current network.
- the non-AP STA 340 receives the beacon frame 330 that is periodically broadcast to receive the network information to perform scanning for the AP 310 and the channel to perform the authentication / association (authentication / association) process Can be.
- the passive scanning method 300 only needs to receive the beacon frame 330 transmitted from the AP 310 without the need for the non-AP STA 340 to transmit the frame.
- passive scanning 300 has the advantage that the overall overhead incurred by the transmission / reception of data in the network is small.
- scanning can be performed manually in proportion to the period of the beacon frame 330, the time taken to perform scanning is relatively increased compared to the active scanning method.
- beacon frame For a detailed description of the beacon frame, see IEEE Draft P802.11-REVmb TM / D12, November 2011 'IEEE Standard for Information Technology Telecommunications and information exchange between systems—Local and metropolitan area networks—Specific requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications (hereinafter referred to as IEEE 802.11) 'are described in 8.3.3.2 beacon frame.
- IEEE 802.11 ai may additionally use other formats of beacon frames, and these beacon frames may be referred to as fast initial link setup (FILS) beacon frames.
- a measurement pilot frame may be used in a scanning procedure as a frame including only some information of a beacon frame. Measurement pilot frames are disclosed in the IEEE 802.11 8.5.8.3 measurement pilot format.
- a FILS discovery frame may be defined.
- the FILS discovery frame is a frame transmitted between transmission periods of a beacon frame at each AP and may be a frame transmitted with a shorter period than the beacon frame. That is, the FILS discovery frame is a frame transmitted with a period smaller than the transmission period of the beacon frame.
- the FILS discovery frame may include identifier information (SSID, BSSID) of the AP transmitting the detection frame.
- the FILS discovery frame may be transmitted before the beacon frame is transmitted to the STA to allow the STA to detect in advance that the AP exists in the corresponding channel.
- the interval at which a FILS discovery frame is transmitted from one AP is called a FILS discovery frame transmission interval.
- the FILS discovery frame may include part of information included in the beacon frame and be transmitted.
- the non-AP STA 390 may transmit the probe request frame 370 to the AP 360 to proactively perform scanning.
- the AP 360 After receiving the probe request frame 370 from the non-AP STA 390, the AP 360 waits for a random time to prevent frame collision, and then includes network information in the probe response frame 380. may transmit to the non-AP STA 390. The non-AP STA 390 may obtain network information based on the received probe response frame 380 and stop the scanning process.
- the probe request frame 370 is disclosed in IEEE 802.11 8.3.3.9 and the probe response frame 380 is disclosed in IEEE 802.11 8.3.3.10.
- the AP and the non-AP STA may perform an authentication procedure and an association procedure.
- FIG. 4 is a conceptual diagram illustrating an authentication procedure and a combined procedure performed after a scanning procedure of an AP and an STA.
- an authentication procedure and a combining procedure with one of the scanned APs may be performed.
- Authentication and association procedures can be performed, for example, via two-way handshaking.
- the left side of FIG. 4 is a conceptual diagram illustrating an authentication and combining procedure after passive scanning, and the right side of FIG. 4 is a conceptual diagram showing an authentication and combining procedure after active scanning.
- the authentication procedure and association procedure are based on an authentication request frame (410) / authentication response frame (420) and an association request frame (430), regardless of whether active scanning or passive scanning is used.
- / Association response frame 440 may be equally performed by exchanging an association response frame 440 between the AP 400, 450 and the non-AP STA 405, 455.
- the non-AP STAs 405 and 455 may transmit the authentication request frame 410 to the APs 400 and 450.
- the AP 400 or 450 may transmit the authentication response frame 420 to the non-AP STAs 405 and 455 in response to the authentication request frame 410.
- Authentication frame format is disclosed in IEEE 802.11 8.3.3.11.
- the non-AP STAs 405 and 455 may transmit an association request frame 430 to the APs 400 and 405.
- the APs 405 and 455 may transmit the association response frame 440 to the non-AP STAs 400 and 450.
- the association request frame 430 transmitted to the AP includes information on the capabilities of the non-AP STAs 405 and 455.
- the APs 400 and 350 may determine whether support for the non-AP STAs 405 and 455 is possible.
- the APs 300 and 450 may transmit the combined response frame 440 to the non-AP STAs 405 and 455.
- the association response frame 440 may include whether to accept the association request frame 440, a reason thereof, and capability information supported by the association response frame 440.
- Association frame format is disclosed in IEEE 802.11 8.3.3.5/8.3.3.6.
- association procedure After the association procedure is performed between the AP and the non-AP STA, normal data transmission and reception may be performed between the AP and the non-AP STA. If the association procedure between the AP and the non-AP STA fails, the association procedure with the AP may be performed again or the association procedure with another AP may be performed again based on the reason for the association failure.
- 5 is a conceptual diagram illustrating an active scanning procedure.
- the active scanning procedure may be performed by the following steps.
- the STA 500 determines whether it is ready to perform a scanning procedure.
- the STA 500 may perform active scanning by waiting until the probe delay time expires or when specific signaling information (eg, PHY-RXSTART.indication primitive) is received. have.
- specific signaling information eg, PHY-RXSTART.indication primitive
- the probe delay time may be a delay generated before the STA 500 transmits the probe request frame 510 when performing the active scanning.
- PHY-RXSTART.indication primitive is a signal transmitted from a physical (PHY) layer to a local medium access control (MAC) layer.
- the PHY-RXSTART.indication primitive may signal to the MAC layer that it has received a PLC protocol data unit (PPDU) including a valid PLCP header in a physical layer convergence protocol (PLCP).
- PPDU PLC protocol data unit
- PLCP physical layer convergence protocol
- a wireless medium may be allocated to a plurality of STAs using a distributed coordination function (DCF), which is a contention-based function.
- the DCF can prevent outgoing between STAs through a carrier sense multiple access / collision avoidance (CSMA / CA) based back-off procedure.
- the STA 500 may transmit the probe request frame 510 to the APs 560 and 570 using a basic access method.
- the STA 500 may identify the AP 1 560 and the AP 2 570 included in the MLME-SCAN.request primitive (for example, service set identification (SSID) and basic service set identification). Information)) to generate the probe request frame 510.
- SSID service set identification
- Information basic service set identification
- the BSSID is an indicator for specifying the AP and may have a value corresponding to the MAC address of the AP.
- the SSID is a network name for specifying an AP that can be read by a person operating the STA.
- the BSSID and / or SSID may be used to specify the AP.
- the STA 500 may transmit a probe request frame to the specified AP 1 560 and the AP 2 570.
- the AP1 560 and the AP2 570 that receive the probe request frame 510 may transmit the probe response frames 550 and 550 to the STA 500.
- the STA 500 may unicast, multicast, or broadcast the probe request frame 510 by transmitting the SSID and the BSSID information in the probe request frame 510.
- a method of unicasting, multicasting or broadcasting the probe request frame 510 using the SSID and the BSSID information will be further described with reference to FIG. 6.
- the STA 500 may include the SSID list in the probe request frame 510 and transmit the SSID list.
- the AP 560, 570 receives the probe request frame 510 and whether to transmit the probe response frames 550, 550 to the STA 500 based on the SSID list included in the received probe request frame 510. You can decide.
- the probe timer may be used to check the minimum channel time (MinChanneltime, 520) and the maximum channel time (MaxChanneltime, 530).
- the minimum channel time 520 and the maximum channel time 530 may be used to control the active scanning operation of the STA 500.
- the minimum channel time 520 may be used for an operation for changing a channel performing active scanning of the STA 500. For example, if the STA 500 does not detect transmission of another frame (eg, probe response frames 550, 550) until the probe timer reaches the minimum channel time 520, the STA 500 does not detect the STA 500. ) May move the scanning channel to perform scanning on another channel. When the STA 500 detects transmission of another frame until the probe timer reaches the minimum channel time 520, the STA 500 may monitor the channel until the probe timer reaches the maximum channel time 530. When the probe timer reaches the maximum channel time 530, the STA may process the received probe response frames 540 and 550.
- another frame eg, probe response frames 550, 550
- the STA 500 searches for the PHY-CCA. Indication primitive until the probe timer reaches the minimum channel time 520 to determine whether there is a frame received through the channel until the minimum channel time 520. You can judge.
- the PHY-CCA. Indication primitive may transmit information about the state of the medium from the physical layer to the MAC layer.
- the PHY-CCA. Indication primitive may inform the STA 500 of the current channel state by using a channel state parameter of busy if the channel is not available and idle if the channel is available.
- the PHY-CCA. Indication primitive is detected as busy, the STA 500 determines that there are probe response frames 550 and 550 received by the STA 500 and the PHY-CCA. Indication primitive is idle. If the search is idle, it may be determined that the probe response frames 550 and 550 received by the STA 500 do not exist.
- the STA 500 may set the net allocation vector (NAV) to 0 and scan the next channel. If the PHY-CCA. Indication primitive is detected as busy, the STA 500 may perform processing on the received probe response frames 550 and 550 after the probe timer reaches the maximum channel time 530. Can be. The STA may set the net allocation vector (NAV) to 0 after processing the received probe response frames 550 and 550 and scan the next channel.
- NAV net allocation vector
- the MLME may signal the MLME-SCAN.confirm primitive.
- the MLME-SCAN.Confirm primitive may include a BSSDescriptionSet containing all the information obtained in the scanning process.
- the STA 500 uses the active scanning method, it is necessary to perform monitoring to determine whether the parameter of the PHY-CCA. Indication primitive is busy until the probe timer reaches the minimum channel time.
- the STA may receive the MLME-SCAN.Request primitive in the MLME in order to perform scanning.
- the MLME-SCAN.Request primitive is a primitive generated by the SME.
- the MLME-SCAN.Request primitive may be used to determine whether there is another BSS to which the STA will bind.
- the MLME-SCAN.Request primitive may specifically include information such as BSSType, BSSID, SSID, ScanType, ProbeDelay, ChannelList, MinChannelTime, MaxChannelTime, RequestInformation, SSID List, ChannelUsage, AccessNetworkType, HESSID, MeshID, VendorSpecificInfo.
- BSSType BSSID
- ScanType ProbeDelay
- ChannelList MinChannelTime
- MaxChannelTime MaxChannelTime
- RequestInformation SSID List
- ChannelUsage AccessNetworkType
- HESSID HESSID
- MeshID MeshID
- VendorSpecificInfo VendorSpecificInfo
- Table 1 below briefly illustrates the information contained in the MLME-SCAN.Request primitive.
- the request parameter included in the MLME-SCAN.Request primitive may include a report request field, a delay reference field, and a maximum delay limit field.
- the report request field may include information for requesting information on another BSS through a probe response frame.
- the delay reference field may include information about a delay type applied in response to the probe request frame, and the maximum delay limit field may include maximum access delay information for the delay type indicated by the delay reference field.
- the request parameter may include a minimum data rate field and / or a received signal strength limit field.
- the minimum data rate field contains information on the lowest overall data rate in transmitting a MAC service data unit (MSDU) or an aggregated (MSDU) -MSDU.
- the received signal strength limit field may further include information about a limit value of a signal required for the receiver of the probe request frame to respond.
- FIG. 6 is a conceptual diagram illustrating a method for transmitting a probe request frame.
- FIG. 6 illustrates a method in which an STA broadcasts, multicasts, and unicasts a probe request frame.
- FIG. 6 illustrates a method in which the STA 600 broadcasts a probe request frame 610.
- the STA 600 may broadcast the probe request frame 610 by including a wildcard SSID and a wildcard BSSID in the probe request frame 610.
- the wild card SSID and wild card BSSID may be used as an identifier for indicating all of the APs 606-1, 606-2, 606-3, 606-4, and 606-6 included in the transmission range of the STA 600. .
- the probe response frame in response to the probe request frame 610 received by the APs 606-1, 606-2, 606-3, 606-4, and 606-6 receiving the broadcast probe request frame 610. If the STA is transmitted to the STA 600 within a predetermined time, the STA 600 may have a problem of receiving and processing too many probe response frames at a time.
- the STA 620 when the STA 620 unicasts the probe request frame 630, the STA 620 transmits a probe request frame 630 including specific SSID and BSSID information of the AP. Can be. Among the APs receiving the probe request frame 630, only the AP 626 corresponding to the specific SSID and the BSSID of the AP 620 may transmit a probe response frame to the STA 620.
- the STA 640 multicasts the probe request frame 660.
- the STA 640 may transmit the SSID list and the wild card BSSID in the probe request frame 660.
- APs 660-1 and 660-2 corresponding to the SSID included in the SSID list included in the probe request frame among the APs receiving the probe request frame 660 may transmit a probe response frame to the STA 640.
- the existing STA may determine whether to unicast, multicast, or broadcast the probe request frame based on the SSID and the BSSID included in the MLME.SCAN-Request primitive.
- Unicast, multicast or broadcast of the probe request frame may be performed based on the setting of the MLME.SCAN-Request primitive as follows.
- the STA unicasts the probe request frame to the AP with the specific BSSID.
- a specific BSSID of an AP may be included in an address field of a MAC header of a unicast probe request frame.
- the STA may multicast the probe request frame to the AP corresponding to the SSID or SSID list.
- the probe request frame may include the SSID or the SSID list, and the wildcard BSSID may be included in the address field of the MAC header of the probe request frame.
- the STA may broadcast a probe request frame.
- the broadcast probe request frame may include a wildcard SSID and may include a wildcard BSSID in the address field of the MAC header.
- the AP may transmit a probe response frame in response to the probe request frame.
- the probe response frame is unicast in response to the probe request frame.
- the probe response frame may be broadcast.
- the probe response frame may be broadcast in response to the probe request frame transmitted by the STA.
- an STA that supports fast initial link establishment may be expressed in terms of FILS STA and an AP that supports fast initial link establishment in terms of FILS AP.
- an STA that does not support fast initial link establishment may be represented by a legacy STA, and an AP that does not support fast initial link establishment may be referred to as a legacy AP.
- the AP or STA supports fast initial link establishment may be interpreted in various ways.
- the AP and the STA can be expressed as FILS STAs and FILS APs that support fast initial link setup. have.
- STAs and APs that operate based on the IEEE 802.11ai standard may be referred to as FILS STAs and FILS APs.
- the AP transmitting the FILS discovery frame and the STA receiving the FILS discovery frame may be referred to as the FILS AP and the FILS STA.
- the FILS discovery frame may include AP's Next TBTT (target beacon transmission time) offset information of the AP.
- the next TBTT offset information of the AP may include information on the transmission timing of the next beacon frame.
- the next TBTT offset information may include time offset information between the discovery frame and the beacon frame to be transmitted next to the discovery frame.
- FIG. 7 is a conceptual diagram illustrating an initial link establishment procedure according to an embodiment of the present invention.
- FIG. 7 an initial link establishment procedure between a plurality of FILS STAs 710, 720, and 730 and a FILS AP 700 is posted.
- the plurality of FILS STAs 710, 720, and 730 may transmit a plurality of probe request frames to the FILS AP 700.
- the FILS AP 700 may broadcast a probe response frame.
- the FILS AP 700 may determine whether to broadcast a probe response frame based on the information included in the received plurality of probe request frames.
- the FILS AP 700 receives a plurality of probe request frames 715, 725, and 735 from the plurality of FILS STAs 710, 720, and 730.
- the FILS AP 700 may determine whether to transmit the same probe response frame based on the plurality of probe request frames 715, 725, and 735 received from the plurality of FILS STAs 710, 720, and 730.
- the FILS AP 700 may broadcast the same probe response frame 705 to the plurality of FILS STAs 710, 720, and 730. Can be.
- the probe response frame may not be unicast to each of the plurality of FILS STAs 710, 720, and 730. Accordingly, fast initial link establishment between the FILS AP 700 and the plurality of FILS STAs 710, 720, and 730 may be performed.
- the FILS AP 700 When the FILS AP 700 receives the plurality of probe request frames 715, 725, and 735 from the plurality of FILS STAs 710, 720, and 730, the above operation may be performed. However, when the probe request frame transmitted by the legacy STA is included in the plurality of probe request frames received by the FILS AP 700, the AP may perform another operation.
- FIG. 8 is a conceptual diagram illustrating an initial link establishment procedure according to an embodiment of the present invention.
- an initial link establishment procedure between at least one FILS STA 810, 820, at least one legacy STA 830, and a FILS AP 800 is posted.
- the FILS AP 800, the legacy STA 830, and the FILS STAs 810 and 820 may operate in the same BSS.
- the initial access procedure between the STA and the AP may be performed differently depending on whether the STA and / or the AP supports fast initial link establishment.
- the FILS AP 800 may receive a plurality of probe request frames 815, 825, 835 from a plurality of STAs (at least one FILS STA 810, 820, 830, and at least one legacy STA 830). have.
- the FILS AP 800 broadcasts the probe response frame 805 for the plurality of probe request frames 815, 825, and 835.
- the FILS STAs 810 and 820 may receive the broadcast probe response frame 805.
- the legacy STA 830 may expect a unicast probe response frame in response to the probe request frame 835.
- the legacy STA 830 may not receive when the monitored probe response frame 805 is not a unicast frame but a broadcast probe response frame. Accordingly, the FILS AP 800 needs to unicast the probe response frame with respect to the probe request frame 835 received from the legacy STA 830.
- the FILS AP 800 must determine in advance whether the STAs 810, 820, and 830 that transmit the probe request frames 815, 825, and 835 are FILS STAs or legacy STAs in order to determine how to transmit the probe response frames. do. If the FILS AP 800 does not determine whether the STAs 810, 820, and 830 that transmit and receive data are FILS STAs or legacy STAs, the FILS APs 800 may perform a procedure for fast initial link establishment. Can't decide whether or not. In more detail, the FILS AP needs information on whether a STA that transmits a probe request frame is a legacy STA or a FILS STA to determine whether to broadcast a probe response frame. Hereinafter, an embodiment of the present invention posts a method of transmitting information on whether the STA supports FILS to the AP.
- the FILS STA posts from the step of transmitting the probe request frame for convenience of description.
- the FILS STA may determine whether to directly transmit a probe request frame.
- the STA will not transmit the probe request frame. Can be.
- the AP may broadcast a probe response frame in response to a probe request frame transmitted by another STA, and the STA may omit transmission of a separate probe request frame by receiving the broadcast probe response frame.
- the STA may receive a probe request frame broadcast by another STA.
- the STA may determine whether a probe request frame broadcast by another STA is a probe request frame transmitted to an AP to which a probe request frame is to be directly transmitted. If the received probe request frame is not the AP to which the probe request frame is to be directly transmitted, the STA may directly generate a probe request frame based on the MLME-SCAN.request primitive.
- FIG. 9 is a conceptual diagram illustrating an initial link establishment procedure according to an embodiment of the present invention.
- the STA transmits information on whether to support fast initial link establishment to the FILS AP (step S900).
- the STA may transmit a FILS AP by including a FILS capability element in the probe request frame.
- the FILS capability element may include information for indicating whether the STA is a FILS STA that supports fast initial link establishment.
- the STA may transmit on a frame other than the probe request frame to transmit information on whether to support fast initial link establishment.
- Information on whether to support fast initial link establishment of the STA may be transmitted from the STA to the FILS AP through various other information formats and various transmission methods.
- the FILS AP determines a method of transmitting a probe response frame based on information on whether to support fast initial link establishment received from the STA (step S910).
- the FILS AP may determine whether at least one STA that transmitted the probe request frame is a legacy STA to determine a method of transmitting a probe response frame.
- the FILS AP may broadcast a probe response frame in response to the plurality of probe request frames.
- the FILS AP may broadcast a probe response frame in response to the probe request frame even when a probe request frame is received from one FILS STA according to an implementation.
- the FILS AP may unicast a separate probe response frame to the legacy STA.
- the FILS AP may determine whether there is a probe request frame received from the legacy STA among the received probe request frames based on the FILS capability element included in the received probe request frame.
- the FILS AP may unicast the probe response frame in response to the probe request frame indicating that no FILS capability element exists or that the fast initial link establishment is not supported by the STA.
- the FILS AP may broadcast a probe response frame in response to the remaining probe request frame indicating that the FILS capability element indicates that the STA supports fast initial link establishment.
- the FILS capability element of all probe request frames received may indicate that FILS is supported by the STA.
- the FILS AP may broadcast a probe response frame in response to the plurality of probe request frames.
- the FILS AP transmits a probe response frame in the determined transmission method (step S920).
- the FILS AP may transmit the probe response frame generated based on the transmission method determined in step S710.
- FIG. 10 is a conceptual diagram illustrating a probe response frame transmission method of a FILS AP according to an embodiment of the present invention.
- FIG. 10 it is assumed that a plurality of STAs that transmit a probe request frame support FILS.
- a plurality of FILS STAs are assumed, but even in the case of one FILS STA, a procedure to be posted below may be applied between the FILS AP and the FILS STA.
- Each of the plurality of FILS STAs 1010, 1020, and 1030 may transmit probe request frames 1015, 1025, and 1035 to the FILS AP 1000.
- the probe request frames 1015, 1025, and 1035 transmitted by each of the plurality of FILS STAs 1010, 1020, and 1030 may include a FILS capability element, and the FILS capability element may be set by an STA for initial initial link establishment. It can indicate that it supports.
- the FILS AP 1000 may identify that all STAs 1010, 1020, and 1030 that transmit the probe request frame are FILS STAs based on the FILS capability elements included in the plurality of probe request frames 1015, 1025, and 1035. Can be obtained. In this case, the FILS AP 1000 may broadcast the probe response frame 1005 to the plurality of FILS STAs 1010, 1020, and 1030.
- the FILS AP 1000 further determines whether there is individual request information in the plurality of received probe request frames 1015, 1025, and 1035 to determine a method of transmitting the probe response frame 1005. You can also decide. For example, a specific probe request frame among the plurality of probe request frames 1015, 1025, and 1035 received from the plurality of FILS STAs 1010, 1020, and 1030 is separately provided through a probe response frame transmitted from the FILS AP 1000. It may include a requested element (requested element) requesting the information of.
- the FILS AP 1000 may unicast the probe response frame including the response to the request element to the FILS STA that transmitted the specific probe request frame in response to the specific probe request frame including the request element.
- the FILS AP 1000 may broadcast the same probe response frame to a plurality of FILS STAs that transmit the remaining probe request frames when the information requested by the other probe request frames is identical except for a specific probe request frame including the request element. Can be.
- the FILS AP 1000 receives the plurality of probe request frames from the plurality of FILS STAs, whether the FILS AP 1000 broadcasts the probe response frame to the plurality of FILS STAs based on various other determinations or whether It may be further determined whether or not to cast.
- the FILS AP 1000 transmits a probe response frame including a response to the request element to a plurality of FILS STAs. You can also broadcast.
- FIG. 11 is a conceptual diagram illustrating a probe response frame transmission method of a FILS AP according to an embodiment of the present invention.
- FIG. 11 it is assumed that at least one of the plurality of STAs 1110, 1120, and 1130 that have transmitted a probe request frame is a legacy STA 1130.
- a plurality of FILS STAs are assumed, but even in the case of one FILS STA, a procedure to be posted below may be applied between the FILS AP and the FILS STA.
- a plurality of FILS STAs 1110, 1120 and legacy STAs 1130 may transmit probe request frames 1115, 1125, and 11135 to the FILS AP 1100.
- FIG. 11 for convenience of description, it is assumed that there is one legacy STA, but there may be a plurality of legacy STAs.
- Probe request frames 1115 and 1125 transmitted by each of the plurality of FILS STAs 1110 and 1120 may include FILS capability elements.
- the FILS capability element may indicate that the STA supports fast initial link establishment.
- the probe request frame 1135 sent by the legacy STA 1130 does not include a FILS capability element or includes a FILS capability element, but the included FILS capability element indicates that fast initial link establishment is not supported by the STA. can do.
- the probe request frame 1135 transmitted by the legacy STA 1130 does not include the FILS capability element.
- the FILS AP 1100 transmits the plurality of probe request frames 1115, 1125, and 1135 based on whether the received plurality of probe request frames 1115, 1125, and 1135 include the FILS capability element.
- the 1120 and 1130 may acquire the information of the FILS STAs 1110 and 1120 and the legacy STA 1130.
- the FILS AP 1100 may broadcast the probe response frame 1103 to the plurality of FILS STAs 1110 and 1120 and unicast the probe response frame 1106 to the legacy STA 1130.
- the legacy STA 1130 may receive the unicast probe response frame 1106 from the FILS AP 1100 to perform initial access.
- the FILS AP 1100 may further determine whether there is individual request information in the plurality of probe request frames received from the plurality of FILS STAs to determine a method of transmitting a probe response frame.
- a specific probe request frame among the plurality of probe request frames received from the plurality of FILS STAs may include a request element for requesting additional information from the FILS AP 1100.
- the FILS AP 1100 may unicast the probe response frame including the response to the request element to the specific FILS STA that transmitted the specific probe request frame in response to the probe request frame including the request element.
- the FILS AP may broadcast the same probe response frame to the plurality of FILS STAs when the information requested by the remaining FILS STAs except for the specific FILS STAs is the same.
- the FILS AP 1100 when the FILS AP 1100 receives a plurality of probe request frames from the plurality of FILS STAs, the FILS AP 1100 broadcasts the probe response frame to the plurality of FILS STAs based on various other determinations. It may be further determined whether to cast or unicast.
- the FILS AP 1100 may include a plurality of FILS STAs in response to a probe response frame including a response to the request element. It can also be broadcast.
- FIG. 12 is a conceptual diagram illustrating a probe request frame according to an embodiment of the present invention.
- a frame body of a probe request frame may include a FILS capability element.
- the FILS capability element may include an element ID, a length, and FILS STA information 1200.
- the FILS STA information 1200 may include a FILS STA indicator 1250 and a reserved bit.
- the element ID may be used to indicate that the information element is a FILS capability element.
- the length may include information about the length of the FILS STA information.
- the FILS STA indicator may indicate whether the STA supports fast initial link establishment. For example, when the FILS STA indicator is 1, it may indicate that the STA supports fast initial link establishment, and when the FILS STA indicator is 0, it may indicate that the STA does not support fast initial link establishment.
- This information format is an example and may transmit information on whether the STA supports fast initial link establishment by various other methods to the FILS AP.
- FIG. 13 is a conceptual diagram illustrating a probe request frame according to an embodiment of the present invention.
- FIG. 13 a method of delivering information on the support for fast initial link setup of STA based on an extended capability element 1300 is disclosed. do.
- the FILS capability information 1350 of the STA may be transmitted to the extended capability element 1300 as shown in Table 2 below.
- the extended capability element 1300 may be delivered in a probe request frame, an authentication request frame, and an association request frame.
- a probe request frame may include an extension capability element 1300.
- the extended capability element 1300 may be an information element including information on a function that the STA can support.
- the STA may transmit information on whether the STA supports the quick initial link establishment based on the extension capability element 1300.
- the FILS capability information 1500 defined as a predetermined bit (eg, 1 bit) in the extension capability element 1300 may be transmitted as to whether the STA supports fast initial link establishment.
- the value of the FILS capability information is 1, it may indicate that the STA supports fast initial link establishment.
- the FILS AP may determine a method of transmitting the probe response frame based on the FILS capability information included in the extended capability element of the received probe request frame.
- FIG. 14 is a conceptual diagram illustrating a probe response frame transmission method according to an embodiment of the present invention.
- FIG. 14 when the FILS AP 1400 receives probe request frames from the plurality of FILS STAs 1410 and 1420 and the at least one legacy STA 1430, the plurality of FILS STAs 1410 and 1420 and the at least one legacy. A method of transmitting a probe response frame to the STA 1430 is posted.
- FIG. 14 it is assumed that two FILS STAs and one legacy STA are described.
- FIG. 14 for convenience of description, a plurality of FILS STAs are assumed, but even in the case of one FILS STA, a procedure to be posted below may be applied between the FILS AP and the FILS STA.
- the FILS AP 1400 broadcasts a probe response frame 1455 to a plurality of FILS STAs 1410 and 1420 in a first time interval 1450.
- the FILS AP 1400 may first broadcast the probe response frame 1455 to the plurality of FILS STAs 1410 and 1420 in the first time interval 1450.
- the first time interval 1450 may be a time interval of part of a maximum channel time MaxChanneltime, which is a maximum time that the STA monitors a probe response frame on a specific channel.
- a predetermined interval within the maximum channel time is transmitted to the FILS STA.
- the first interval 1450 for broadcasting the probe response frame may be set, and the remaining interval may be set as the second interval 1460 for unicasting the probe response frame to the legacy STA.
- the section in which the probe response frame 1455 is broadcast by the FILS AP 1400 may be a section included in the minimum channel time (MinChanneltime).
- MinChanneltime minimum channel time
- the legacy STA 1430 monitoring the unicast probe response frame 1465 may receive a probe response frame broadcasted through the channel. 1455 may be sensed.
- the PHY-CCA. Indication primitive may be searched busy in the legacy STA 1430, and the legacy STA 1430 may be unified from the FILS AP 1400 until the probe timer reaches the maximum channel time.
- the probe response frame 1465 that is cast may be monitored.
- the FILS AP 1400 may unicast the probe response frame to the legacy STA 1430 in the second time interval 1460.
- the second time interval 1460 may be a period corresponding to the maximum channel time MaxChannelTime after the first time interval 1450.
- the maximum channel time may be a maximum period in which the STA monitors a probe response frame on the channel.
- a probe response frame may be transmitted from the FILS AP 1400 in the reverse order.
- 15 is a conceptual diagram illustrating a probe response frame transmission method according to an embodiment of the present invention.
- the FILS AP 1500 receives probe request frames from the plurality of FILS STAs 1510 and 1520 and the at least one legacy STA 1530, the plurality of FILS STAs 1510 and 1520 and the at least one legacy. Posts a method of transmitting a probe response frame to the STA (1530).
- FIG. 15 it is assumed that two FILS STAs and one legacy STA are described.
- FIG. 15 for convenience of description, a plurality of FILS STAs are assumed, but even in the case of one FILS STA, a procedure to be posted below may be applied between the FILS AP and the FILS STA.
- the FILS AP 1500 unicasts the probe response frame 1555 to the legacy STA 1530 in the first time interval 1550.
- the FILS AP 1500 may first unicast the probe response frame 1555 to the legacy STA 1530 in the first time interval 1550.
- the first time interval 1550 may be a time interval of part of a maximum channel time MaxChanneltime at which the STA scans a specific channel.
- the FILS AP 1500 when the FILS AP 1500 receives a probe request frame from a plurality of FILS STAs and at least one legacy STA, the FILS AP 1500 unifies the probe response frame to at least one legacy STA within a maximum channel time. It may be set as a section to cast and the remaining section may be set as a section for broadcasting a probe response frame to a plurality of FILS STA.
- the section in which the probe response frame 1555 is unicast by the FILS AP 1500 may be a section corresponding to a minimum channel time (MinChanneltime).
- MinChanneltime a minimum channel time
- the FILS STAs 1510 and 1520 monitoring the broadcast probe response frame are unicast probe response frames 1555 through the channel.
- the PHY-CCA. Indication primitive may be detected as busy in the FILS STAs 1510 and 1520, and the FILS STAs 1510 and 1520 may check the FILS APs until the probe timer reaches the maximum channel time.
- the probe response frame 1565 broadcast from 1500 may be monitored.
- the FILS AP 1500 may broadcast a probe response frame 1565 to the FILS STAs 1510 and 1520 in the second time interval 1560.
- the second time interval 1560 may be a period corresponding to the maximum channel time MaxMaxTime after the first time interval 1550.
- the maximum channel time may be a maximum period in which the STA monitors a probe response frame on the channel.
- 16 is a block diagram illustrating a wireless device to which an embodiment of the present invention can be applied.
- the wireless device 1600 may be an STA capable of implementing the above-described embodiment, and may be an AP 1600 or a non-AP station (or STA) 1650.
- the AP 1600 includes a processor 1610, a memory 1620, and an RF unit 1630.
- the RF unit 1630 may be connected to the processor 1620 to transmit / receive a radio signal.
- the processor 1620 may implement the functions, processes, and / or methods proposed in the present invention.
- the processor 1620 may be implemented to perform the operation of the wireless device according to the embodiment of the present invention described above.
- the processor may perform an operation of the wireless device disclosed in the embodiment of FIGS. 7 to 15.
- the processor 1620 may determine whether to broadcast or unicast the probe response frame based on the probe request frame received from the STA. For example, the AP may determine whether the STA supports fast initial link establishment from the FILS capability information of the received probe request frame. As a result of the determination, the AP may broadcast the probe response frame in response to the probe request frame including the FILS capability information transmitted from the FILS STA. Also, as a result of determination, the AP responds to the probe request frame not including the FILS capability information transmitted from the legacy STA or the probe response frame in response to the probe request frame indicating that the STA does not support fast initial link establishment by the FILS capability information. Frames can be unicast
- the STA 1650 includes a processor 1660, a memory 1670, and a radio frequency unit (RF) 1680.
- RF radio frequency unit
- the RF unit 1680 may be connected to the processor 1660 to transmit / receive a radio signal.
- the processor 1660 may implement the functions, processes, and / or methods proposed in the present invention.
- the processor 1620 may be implemented to perform the operation of the wireless device according to the embodiment of the present invention described above.
- the processor may perform the operation of the wireless device in the embodiment of FIGS. 7 to 15.
- the processor 1660 may be implemented to transmit a first probe request frame to an access point (AP) and receive a probe response frame in response to the first probe request frame from the AP.
- the first probe request frame may include fast initial link setup (FILS) capability information, and the FILS capability information may indicate whether the STA supports fast initial link setup.
- FILS fast initial link setup
- Processors 1610 and 1660 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices, and / or converters for interconverting baseband signals and wireless signals.
- the memories 1620 and 1670 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media and / or other storage devices.
- the RF unit 1630 and 1680 may include one or more antennas for transmitting and / or receiving a wireless signal.
- Modules may be stored in memories 1620 and 1670 and executed by processors 1610 and 1660.
- the memories 1620 and 1670 may be inside or outside the processors 1610 and 1660, and may be connected to the processors 1610 and 1660 by various well-known means.
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Abstract
Description
Claims (10)
- 무선랜에서 액티브 스캐닝을 수행하는 방법에 있어서,
제1 STA(station)이 제1 프로브 요청 프레임을 AP(access point)로 전송하는 단계; 및
상기 제1 STA이 상기 AP로부터 프로브 응답 프레임을 수신하되, 상기 프로브 응답 프레임은 상기 제1 프로브 요청 프레임에 대한 응답인, 단계를 포함하되,
상기 제1 프로브 요청 프레임은 FILS(fast initial link setup) 역량 정보(FILS capability information)를 포함하고,
상기 FILS 역량 정보는 상기 제1 STA이 빠른 초기 링크 설정을 지원하는지 여부를 지시하는 액티브 스캐닝 방법. - 제2항에 있어서,
상기 FILS 역량 정보가 상기 제1 STA이 빠른 초기 링크 설정을 지원하는 것을 지시하는 경우, 상기 프로브 응답 프레임은 브로드캐스트되는 액티브 스캐닝 방법. - 제3항에 있어서,
상기 FILS 역량 정보가 상기 제1 STA이 빠른 초기 링크 설정을 지원하는 것을 지시하지 않는 경우, 상기 프로브 응답 프레임은 상기 제1 STA으로 유니캐스트되는 액티브 스캐닝 방법. - 제1항에 있어서,
상기 제1 STA이 제2 STA에 의해 브로드캐스트된 제2 프로브 요청 프레임을 수신하는 단계;
상기 제1 STA이 상기 제2 프로브 요청 프레임이 상기 AP로 전송되는지 여부를 판단하는 단계를 더 포함하고,
상기 제1 STA이 상기 제2 프로브 요청 프레임이 상기 AP로 전송되지 않는다고 판단하는 경우, 상기 제1 프로브 요청 프레임이 전송되는 액티브 스캐닝 방법. - 제4항에 있어서,
상기 FILS 역량 정보는 상기 프로브 요청 프레임의 확장 역량 요소(extended capability element)에 포함되고,
상기 확장 역량 요소는 상기 제1 STA의 역량(capability)에 대한 정보를 포함하는 액티브 스캐닝 방법. - 무선랜에서 액티브 스캐닝을 수행하는 STA(station)에 있어서, 상기 STA은,
무선 신호를 송신하기 위해 구현된 RF(radio frequency)부; 및
상기 RF부와 선택적으로 연결되는 프로세서를 포함하되,
상기 프로세서는 제1 프로브 요청 프레임을 AP(access point)로 전송하고, 상기 AP로부터 상기 제1 프로브 요청 프레임에 대한 응답으로 프로브 응답 프레임을 수신하도록 구현되되,
상기 제1 프로브 요청 프레임은 FILS(fast initial link setup) 역량 정보(FILS capability information)를 포함하고,
상기 FILS 역량 정보는 상기 STA이 빠른 초기 링크 설정을 지원하는지 여부를 지시하는 STA. - 제6항에 있어서,
상기 FILS 역량 정보가 상기 STA이 빠른 초기 링크 설정을 지원하는 것을 지시하는 경우, 상기 프로브 응답 프레임은 브로드캐스트되는 STA. - 제7항에 있어서,
상기 FILS 역량 정보가 상기 STA이 빠른 초기 링크 설정을 지원하는 것을 지시하지 않는 경우, 상기 프로브 응답 프레임은 상기 STA으로 유니캐스트되는 STA. - 제6항에 있어서,
상기 프로세서는 다른 STA에 의해 브로드캐스트된 제2 프로브 요청 프레임을 수신하고, 상기 제2 프로브 요청 프레임이 상기 AP로 전송되는지 여부를 판단하도록 구현되고,
상기 프로세서가 상기 제2 프로브 요청 프레임이 상기 AP로 전송되지 않는다고 판단하는 경우, 상기 제1 프로브 요청 프레임이 전송되는 STA.
- 제9항에 있어서,
상기 FILS 역량 정보는 상기 프로브 요청 프레임의 확장 역량 요소(extended capability element)에 포함되고,
상기 확장 역량 요소는 상기 제1 STA의 역량(capability)에 대한 정보를 포함하는 STA.
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
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CA2891315A CA2891315C (en) | 2013-05-06 | 2014-04-29 | Method and apparatus for active scanning in wireless lan |
EP14794864.0A EP2996400B1 (en) | 2013-05-06 | 2014-04-29 | Method and apparatus for active scanning in wireless lan |
AU2014263433A AU2014263433B2 (en) | 2013-05-06 | 2014-04-29 | Method and apparatus for active scanning in wireless LAN |
CN201480003244.3A CN104823488A (zh) | 2013-05-06 | 2014-04-29 | 在无线lan中用于主动扫描的方法和设备 |
KR1020157017664A KR101672151B1 (ko) | 2013-05-06 | 2014-04-29 | 무선랜에서 액티브 스캐닝을 수행하는 방법 및 장치 |
JP2015541708A JP2015537469A (ja) | 2013-05-06 | 2014-04-29 | 無線lanにおけるアクティブスキャニングを実行する方法及び装置 |
US14/443,124 US9451538B2 (en) | 2013-05-06 | 2014-04-29 | Method and apparatus for active scanning in wireless LAN |
PH12015501112A PH12015501112A1 (en) | 2013-05-06 | 2015-05-20 | Method and apparatus for active scanning in wireless lan |
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- 2014-04-29 AU AU2014263433A patent/AU2014263433B2/en active Active
- 2014-04-29 KR KR1020157017664A patent/KR101672151B1/ko active IP Right Grant
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- 2014-04-29 CA CA2891315A patent/CA2891315C/en active Active
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US9451538B2 (en) | 2016-09-20 |
AU2014263433A1 (en) | 2015-06-04 |
CN104823488A (zh) | 2015-08-05 |
EP2996400A1 (en) | 2016-03-16 |
AU2014263433B2 (en) | 2016-02-11 |
KR20150103027A (ko) | 2015-09-09 |
KR101672151B1 (ko) | 2016-11-02 |
US20170006527A1 (en) | 2017-01-05 |
US10015726B2 (en) | 2018-07-03 |
EP2996400B1 (en) | 2018-09-12 |
CA2891315A1 (en) | 2014-11-13 |
PH12015501112A1 (en) | 2015-08-17 |
US20160007275A1 (en) | 2016-01-07 |
JP2015537469A (ja) | 2015-12-24 |
CA2891315C (en) | 2017-02-28 |
EP2996400A4 (en) | 2017-01-25 |
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