US20160037341A1 - Method and device for configuring link in wireless lan system - Google Patents
Method and device for configuring link in wireless lan system Download PDFInfo
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- US20160037341A1 US20160037341A1 US14/776,228 US201414776228A US2016037341A1 US 20160037341 A1 US20160037341 A1 US 20160037341A1 US 201414776228 A US201414776228 A US 201414776228A US 2016037341 A1 US2016037341 A1 US 2016037341A1
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- request message
- probe request
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/06—Authentication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/12—Network monitoring probes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/12—Avoiding congestion; Recovering from congestion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0092—Indication of how the channel is divided
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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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
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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
- H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
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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
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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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]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/20—Information technology specific aspects, e.g. CAD, simulation, modelling, system security
Definitions
- the present invention is to provide apparatuses for configuring links between WLAN devices in a congested environment having a large number of wireless devices.
- a control part 160 may perform a role of controlling each of the NICs 111 to 119 to make the MS 100 try to access the AP through an appropriate frequency band by using access information provided by the AP and user/system requirements.
Abstract
A method and device for configuring a link in a wireless LAN system are disclosed. The wireless link configuration method comprises the steps of: acquiring a first probe request message transmitted by a first mobile terminal; transmitting a second probe request message within a maximum channel time from a time point at which the transmission of the first probe request message ends; and receiving one probe response message, which is a response to the first probe request message and the second probe request message, from a wireless access device. Therefore, a time for configuring a link between wireless LAN devices can be reduced.
Description
- A variety of example embodiments according to the present invention generally relate to configuration of a wireless link, and more specifically to methods and devices for rapidly configuring an initial link in a wireless local area networking (WLAN) system.
- Currently, according to wide distribution of mobile stations, a wireless local area networking (WLAN) technology which can provide faster wireless internet services to the mobile stations is becoming remarkable. The WLAN technology is a technology which can make mobile stations such as smart phones, smart pads, laptop computers, portable multimedia players, embedded devices, etc. able to wirelessly access an internet in home, company, or specific service provision areas, based on wireless communication technologies.
- The present invention is to provide methods for configuring links between WLAN devices in a congested environment having a large number of wireless devices.
- Also, the present invention is to provide apparatuses for configuring links between WLAN devices in a congested environment having a large number of wireless devices.
- In order to achieve the purposes of the present invention, according to an example embodiment according to the present invention, a method may be provided for configuring a wireless link, and performed in a second mobile station. The method may comprise obtaining a first probe request message transmitted from a first mobile station; transmitting a second probe request message within a maximum channel time from a time point of completion of the first probe request message; and receiving a single probe response message from a wireless access station in response to the first probe request message and the second probe request message.
- Here, the method may further comprise requesting authentication to the wireless access station by using wireless access information obtained from the probe response message.
- In order to achieve the purposes of the present invention, according to another example embodiment according to the present invention, a method may be provided for configuring a wireless link, and performed in a wireless access station. The method may comprise receiving a first probe request message from a first mobile station; receiving a second probe request message from a second mobile station within a maximum channel time from a time point of completion of the first probe request message; analyzing similarity between the first probe request message and the second probe request message; and transmitting at least one probe response message corresponding to the first probe request message and the second probe request message when a degree of the similarity satisfies a predetermined threshold.
- Here, the method may further comprise receiving authentication requests from the first mobile station and the second mobile station.
- Here, the probe response message may be transmitted when service set identifiers (SSID) of the first probe request message and the second probe request message coincide with each other.
- In order to achieve another purpose of the present invention, according to an example embodiment according to the present invention, a second mobile station may be provided as comprising a control part controlling operations of the second mobile station, and at least one network interface card for transmitting and receiving data based on commands of the control part. Also, the control part may obtain a first probe request message transmitted from a first mobile station, transmit a second probe request message within a maximum channel time from a time point of completion of the first probe request message, and receive a single probe response message from a wireless access station in response to the first probe request message and the second probe request message.
- Here, the control part may request authentication to the wireless access station by using wireless access information obtained from the probe response message.
- In order to achieve another purpose of the present invention, according to another example embodiment according to the present invention, a wireless access station may be provided as comprising a control part controlling operations of the wireless access station, and at least one network interface card for transmitting and receiving data based on commands of the control part. Also, the control part may receive a first probe request message from a first mobile station, receive a second probe request message from a second mobile station within a maximum channel time from a time point of completion of the first probe request message, analyze similarity between the first probe request message and the second probe request message, and transmit at least one probe response message corresponding to the first probe request message and the second probe request message when a degree of the similarity satisfies a predetermined threshold.
- Here, the control part may receive authentication requests from the first mobile station and the second mobile station.
- Here, the probe response message may be transmitted when service set identifiers (SSID) of the first request message and the second probe request message coincide with each other.
- According to example embodiments of the present invention, a time needed for configuring wireless links between WLAN devices can be reduced when a large number of WLAN devices request wireless link configurations in a congested area. Especially, according to example embodiments of the present invention, when multiple mobile stations transmit a plurality of probe request messages at the same time, the time needed for configuring wireless links can be reduced by minimizing collisions between probe response messages corresponding to the probe request messages.
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FIG. 1 conceptually illustrates an example configuration of a WLAN system to which embodiments of the present invention can be applied. -
FIG. 2 conceptually illustrate a step in which MS configures a link with AP according to an example embodiment of the present invention. -
FIG. 3 illustrates a passive scanning step of MS related to an example embodiment of the present invention. -
FIG. 4 illustrates an active scanning step of MS related to an example embodiment of the present invention. -
FIG. 5 is a block diagram which conceptually illustrates a mobile station (MS) 100 related to an example embodiment of the present invention. -
FIG. 6 is a block diagram which conceptually illustrates anaccess point 200 related to an example embodiment of the present invention. -
FIG. 7 is a flow chart illustrating a WLAN access procedure, as an example embodiment of the present invention, in which a plurality of mobile stations access an AP at the same time. -
FIG. 8 illustrates detailed logic of a first analysis in the example embodiment illustrated inFIG. 7 . -
FIG. 9 illustrates a packet structure of a beacon message transmitted by AP according to the present invention. -
FIG. 10 illustrates a packet structure of a probe request message transmitted by MS according to the present invention. -
FIG. 11 illustrates a packet structure of a probe response message transmitted by AP according to the present invention. - Since embodiments described in the present specification are intended to clearly describe the spirit of the present invention to those skilled in the art to which the present invention pertains, the present invention is not limited to those embodiments described in the present specification, and it should be understood that the scope of the present invention includes changes or modifications without departing from the spirit of the invention.
- The terms and attached drawings used in the present specification are intended to easily describe the present invention and shapes shown in the drawings are exaggerated to help the understanding of the present invention if necessary, and thus the present invention is not limited by the terms used in the present specification and the attached drawings.
- In the present specification, detailed descriptions of known configurations or functions related to the present invention which have been deemed to make the gist of the present invention unnecessarily obscure will be omitted below.
- Hereinafter, a method and a device for fast accesses between WLAN devices using a plurality of communication channels according to embodiments of the present invention will be described.
- Among standards of WLAN technologies, standardization on Medium Access Control (MAC) and Physical (PHY) layers are going on in an Institute of Electrical and Electronics Engineers (IEEE) 802.11 working group.
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FIG. 1 conceptually illustrates an example configuration of a WLAN system to which embodiments of the present invention can be applied. - Referring to
FIG. 1 , the WLAN system may include one or more basic service sets (BSS) 211 and 221. The BSS 211 or 221 is a set of stations which can communicate with each other, and managed by an access point (AP) 210 or 220. A mobile station (MS) 110 or 120 may perform a role of providing wireless internet services to a user by accessing the AP 210 or 220 according to IEEE 802.11 WLAN standards. - The BSS 211 or 221 may be classified into an infrastructure BSS and an independent BSS, and the infrastructure BSS is illustrated in
FIG. 1 . The BSS-1 211 is managed and operated by the AP-1 210, and one or more MSs including MS-1 110 and MS-2 120 may receive WLAN services through the AP-1 210. Also, the AP-1 210 is connected to the AP-2 220 through a distribution system (DS) 300. The BSSs 211 and 221 connected through the DS 300 may form an extended service set (ESS) 410. Since the detail of configurations of WLAN systems is described in the standard specifications such as IEEE 802.11-2012 (Mar 29, 202), explanation on the detail will be omitted herein. The contents of the standard specifications may be combined to the present description for reference. -
FIG. 2 conceptually illustrate a step in which MS configures a link with AP according to an example embodiment of the present invention. - Referring to
FIG. 2 , a procedure forMS 100 to accessAP 200 may comprise three steps—scanning, authentication, and association. The scanning step is a step in which the MS 100 obtains access information of a BSS operated by the AP 200. For the scanning, there are a passive scanning technique S101 that obtains information by using beacon messages which are periodically transmitted by the AP, and an active scanning technique in which the MS transmits a probe request to the AP (S103), receives a probe response from the AP (S105), and obtains access information from the probe response. - The MS 100 which successfully receives the wireless access information in the scanning step may perform the authentication step by transmitting an authentication request (S107 a) and receiving an authentication response (S107 b). After successful completion of the authentication step in the IEEE 802.11 layer, the association step (S109 a and S109 b) may be performed. In addition, authentication based on 802.1X (S111) and a step of obtaining IP address through DHCP (S113) may be performed.
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FIG. 3 illustrates a passive scanning step of MS related to an example embodiment of the present invention. - Referring to
FIG. 3 , the MS-1 110 according to the present invention may obtain wireless access information or respective APs by receiving beacon message which are periodically transmitted by AP-1 210 and AP-2 220 located adjacently. -
FIG. 4 illustrates an active scanning step of MS related to an example embodiment of the present invention. - Referring to
FIG. 4 , the MS-1 110 according to the present invention may transmits a probe request message to obtain information of APs located adjacently, and obtain wireless access information of respective APs by receiving the corresponding probe response messages from AP-1 210 and AP-2 220. -
FIG. 5 is a block diagram which conceptually illustrates a mobile station (MS) 100 related to an example embodiment of the present invention. - Referring to
FIG. 5 , theMS 100 according to the present invention may comprise at least one network interface cards (NIC) 111 to 119 performing a WLAN access through an AP. Thenetwork interface cards 111 to 119, modules for performing WLAN access, may be embedded within the MS or installed in outside of the MS. Thenetwork interface cards 111 to 119 may perform wireless communications with the AP according to respective supported WLAN specifications. Also, among thenetwork interface cards 111 to 119, only one NIC may operate at a time or a plurality of NICs may simultaneously operate according to performance of theMS 100 or system requirements. In theMS 100 ofFIG. 5 , themultiple NICs 111 to 119 are illustrated as separated, and MAC and PHY layers of each NIC may operate independently from each other. TheseNICs 111 to 119 may be implemented as a functional entity which can be separated physically or as a single integrated physical entity. - A
mobile communication module 120 may make theMS 100 transmit and receive wireless signals to/from an external device in a mobile communication network. - A
user interface part 130 may make commands for controlling theMS 100 be input by a user. - A
display part 140 may display results from operations of theMS 100, status of theMS 100, and information provided by the AP. - A
memory part 150 may store access program codes for controlling access to the AP, and various data for the program codes. - A
control part 160 may perform a role of controlling each of theNICs 111 to 119 to make theMS 100 try to access the AP through an appropriate frequency band by using access information provided by the AP and user/system requirements. -
FIG. 6 is a block diagram which conceptually illustrates anaccess point 200 related to an example embodiment of the present invention. - Referring to
FIG. 6 , theAP 200 according to the present invention may comprise at least one network interface cards (NIC) 211 to 219 for operating BSS in one or more frequency bands. Thenetwork interface cards 211 to 219, modules for performing WLAN access, may be embedded within theAP 200 or installed in outside of theAP 200. TheNICs 211 to 219 may perform wireless communications with the MS according to respective supported WLAN specifications. Also, among thenetwork interface cards 211 to 219, only one NIC may operate at a time or a plurality of NICs may simultaneously operate according to performance of theAP 200 or system requirements. In theAP 200 ofFIG. 6 , a plurality ofNICs 211 to 219 are illustrated as separated, and MAC and PHY layers of each NIC may operate independently from each other. TheseNICs 211 to 219 may be implemented as a functional entity which can be separated physically or as a single integrated physical entity. - A
memory part 250 may store access program codes for controlling access from mobile stations, and various data for the program codes. - A
control part 260 may perform a role of controlling each of theNICs 211 to 219 to make theAP 200 process access from MS through an appropriate frequency band by using access information for multiple frequency bands and user/system requirements. -
FIG. 7 is a flow chart illustrating a WLAN access procedure, as an example embodiment of the present invention, in which a plurality of mobile stations access an AP at the same time, andFIG. 8 illustrates detailed logic of a first analysis in the example embodiment illustrated inFIG. 7 . - Referring to
FIG. 7 andFIG. 8 , a firstmobile station 100 may transmit a first probe request message (S103). A secondmobile station 1000 may obtain (i.e., overhear) the first probe request message transmitted from the firstmobile station 100. In this case, the second mobile station may transmit a second probe request message of it within a maximum channel time (i.e., ‘MaxChannelTime’) from a time point of completion of the first probe request message (S1003). - Meanwhile, a
wireless access station 200 may receive both the first probe request message transmitted by the firstmobile station 100 and the second probe request message transmitted by the secondmobile station 1000. Thewireless access station 200 may analyze similarity between the first probe request message and the second probe request message (S204). For example, thewireless access station 200 may analyze the similarity based on a first service set identifier (SSID) included in the first probe request message and a second SSID included in the second probe request message. That is, thewireless access station 200 may determine as the first probe request message is similar to the second probe request message when the first SSID is identical to the second SSID. - In addition, the
wireless access station 200 may analyze the similarity between the probe request messages by using items other than SSIS. For example, when access requirements (e.g., frequency band information, transmission speed, load information, etc.) are included in the probe request message, thewireless access station 200 may analyze the similarity between first access requirements included in the first probe request message and second access requirements included in the second probe request message. As a result, if the access requirements coincide with each other, it may be determined that the first probe request message is similar to the second probe request message. Here, although access requirements are proposed as an example of items which can be used for determining similarity, a method for configuring wireless links according to the present invention is not limited to the example. - In case that the first probe request message is similar to the second probe request message, the
wireless access point 200 may transmit at least one probe response message (or, a beacon message) as a response to the first probe request message and the second probe request message (S105, S105 a). In this case, thewireless access station 200 may broadcast the probe response message, or transmit the probe response message to the firstmobile station 100 and the secondmobile station 1000 by specifying them as destinations. - In case of receiving the probe response message, the first
mobile station 100 may transmit a first authentication request message to the wireless access station 200 (S107). Then, the firstmobile station 100 may perform an authentication step and an association step with thewireless access station 200 so as to access thewireless access station 200. - Also, in case of receiving the probe response message, the second
mobile station 1000 may also transmit a second authentication request message to the wireless access station 200 (S1007). Then, the secondmobile station 1000 may perform an authentication step and an association step with thewireless access station 200 so as to access thewireless access station 200. -
FIG. 9 illustrates a packet structure of a beacon message transmitted by AP according to the present invention. -
FIG. 10 illustrates a packet structure of a probe request message transmitted by MS according to the present invention. -
FIG. 11 illustrates a packet structure of a probe response message transmitted by AP according to the present invention.
Claims (10)
1. A method of configuring a wireless link, performed in a second mobile station, the method comprising:
obtaining a first probe request message transmitted from a first mobile station;
transmitting a second probe request message within a maximum channel time from a time point of completion of the first probe request message; and
receiving a single probe response message from a wireless access station in response to the first probe request message and the second probe request message.
2. The method of claim 1 , further comprising requesting authentication to the wireless access station by using wireless access information obtained from the probe response message.
3. A method of configuring a wireless link, performed in a wireless access station, the method comprising:
receiving a first probe request message from a first mobile station;
receiving a second probe request message from a second mobile station within a maximum channel time from a time point of completion of the first probe request message;
analyzing similarity between the first probe request message and the second probe request message; and
when a degree of the similarity satisfies a predetermined threshold, transmitting at least one probe response message corresponding to the first probe request message and the second probe request message.
4. The method of claim 3 , further comprising receiving authentication requests from the first mobile station and the second mobile station.
5. The method of claim 3 , wherein the probe response message is transmitted when service set identifiers (SSID) of the first probe request message and the second probe request message coincide with each other.
6. A second mobile station comprising:
a control part controlling operations of the second mobile station; and
at least one network interface card for transmitting and receiving data based on commands of the control part,
wherein the control part obtains a first probe request message transmitted from a first mobile station, transmits a second probe request message within a maximum channel time from a time point of completion of the first probe request message, and receives a single probe response message from a wireless access station in response to the first probe request message and the second probe request message.
7. The station of claim 1 , wherein the control part requests authentication to the wireless access station by using wireless access information obtained from the probe response message.
8. A wireless access station comprising:
a control part controlling operations of the wireless access station; and
at least one network interface card for transmitting and receiving data based on commands of the control part,
wherein the control part receives a first probe request message from a first mobile station, receives a second probe request message from a second mobile station within a maximum channel time from a time point of completion of the first probe request message, analyzes similarity between the first probe request message and the second probe request message, and transmits at least one probe response message corresponding to the first probe request message and the second probe request message when a degree of the similarity satisfies a predetermined threshold.
9. The station of claim 8 , wherein the control part receives authentication requests from the first mobile station and the second mobile station.
10. The station of claim 8 , wherein the probe response message is transmitted when service set identifiers (SSID) of the first request message and the second probe request message coincide with each other.
Applications Claiming Priority (7)
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KR10-2013-0028310 | 2013-03-15 | ||
KR20130028310 | 2013-03-15 | ||
KR1020130048955A KR20140113237A (en) | 2013-03-15 | 2013-04-30 | Method for wireless link setup of wireless access point in congested environments |
KR1020130048952A KR20140113236A (en) | 2013-03-15 | 2013-04-30 | Method for wireless link setup of mobile station in congested environments |
KR10-2013-0048955 | 2013-04-30 | ||
KR10-2013-0048952 | 2013-04-30 | ||
PCT/KR2014/002095 WO2014142567A1 (en) | 2013-03-15 | 2014-03-13 | Method and device for configuring link in wireless lan system |
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US14/776,228 Abandoned US20160037341A1 (en) | 2013-03-15 | 2014-03-13 | Method and device for configuring link in wireless lan system |
US14/777,372 Active US9706477B2 (en) | 2013-03-15 | 2014-03-13 | Method and device for configuring multi-band based link in wireless LAN system |
US14/777,310 Abandoned US20160036705A1 (en) | 2013-03-15 | 2014-03-14 | Method and device for configuring link in wireless lan system |
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KR101627621B1 (en) * | 2014-12-05 | 2016-06-07 | 주식회사 케이티 | Method, ap device and system for providing speed information of wireless lan |
DE102015222309B4 (en) * | 2015-11-12 | 2020-11-05 | Volkswagen Aktiengesellschaft | Device, method and computer program for frequency band selection |
CN106453117A (en) * | 2016-11-10 | 2017-02-22 | 珠海市魅族科技有限公司 | Method and device for processing network resources |
WO2020215246A1 (en) * | 2019-04-24 | 2020-10-29 | Hewlett Packard Enterprise Development Lp | Multi-band channel scanning |
US11881921B2 (en) * | 2019-04-24 | 2024-01-23 | Hewlett Packard Enterprise Development Lp | Multi-band directional scanning |
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- 2013-04-30 KR KR1020130048951A patent/KR20140113235A/en not_active Application Discontinuation
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US20160036579A1 (en) | 2016-02-04 |
KR20140113236A (en) | 2014-09-24 |
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KR20140113241A (en) | 2014-09-24 |
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US20160036705A1 (en) | 2016-02-04 |
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KR20140113234A (en) | 2014-09-24 |
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KR20140113232A (en) | 2014-09-24 |
US20160050614A1 (en) | 2016-02-18 |
KR20140113233A (en) | 2014-09-24 |
US20160029300A1 (en) | 2016-01-28 |
KR20140113231A (en) | 2014-09-24 |
KR20140113235A (en) | 2014-09-24 |
KR20140113239A (en) | 2014-09-24 |
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