WO2014142567A1

WO2014142567A1 - Method and device for configuring link in wireless lan system

Info

Publication number: WO2014142567A1
Application number: PCT/KR2014/002095
Authority: WO
Inventors: 손주형; 곽진삼
Original assignee: 인텔렉추얼디스커버리 주식회사
Priority date: 2013-03-15
Filing date: 2014-03-13
Publication date: 2014-09-18

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

Method and device for link establishment in wireless LAN system

Various embodiments of the present disclosure generally relate to link establishment, and more particularly, to a method and apparatus for fast initial link establishment in a WLAN system.

Recently, with the expansion of mobile terminals, wireless LAN (Wireless LAN) technology that can provide a fast wireless Internet service to them is receiving a lot of attention. WLAN technology is based on wireless communication technology that enables mobile terminals such as smart phones, smart pads, laptop computers, portable multimedia players, and embedded devices to be connected to the Internet wirelessly at home, enterprise, or specific service area. to be.

It is an object of the present invention to provide a method for establishing a wireless link between WLAN devices in a crowded situation due to many wireless devices.

Another object of the present invention is to provide an apparatus for establishing a wireless link between WLAN devices in a crowded situation due to many wireless devices.

In accordance with one aspect of the present invention, there is provided a method for establishing a radio link in a second mobile terminal, the method comprising: acquiring a first probe request message transmitted by a first mobile terminal, the first probe request message; Transmitting a second probe request message within a maximum channel time from the time point at which the transmission is completed; 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. Steps.

Here, the radio link setting method may further include requesting authentication to the radio access apparatus using radio access information obtained from the probe response message.

According to another aspect of the present invention, there is provided a method for establishing a wireless link, the method comprising: receiving a first probe request message from a first mobile terminal, and receiving the first probe request from a second mobile terminal. Receiving a second probe request message within a maximum channel time from when a request message is received; analyzing similarity between the first probe request message and the second probe request message; If satisfied, transmitting at least one probe response message corresponding to the first probe request message and the second probe request message.

Here, the wireless link setting method may further include receiving an authentication request from the first mobile terminal and the second mobile terminal.

The probe response message may be transmitted when the SSIDs of the first probe request message and the second probe request message match.

A second mobile terminal according to an embodiment of the present invention for achieving the another object, the control unit for controlling the operation of the second mobile terminal, and at least one network interface for transmitting and receiving data based on the command of the control unit And a card, wherein the controller acquires a first probe request message transmitted by a first mobile terminal, transmits a second probe request message within a maximum channel time from when the first probe request message is transmitted, Receive one probe response message, which is a response to the first probe request message and the second probe request message, from the wireless access device.

Here, the controller may request authentication from the wireless access device by using the wireless access information obtained from the probe response message.

According to another aspect of the present invention, there is provided a wireless access device including a control unit for controlling an operation of the wireless access device, and at least one network interface card for transmitting and receiving data based on a command of the control unit. The control unit may include receiving a first probe request message from a first mobile terminal and receiving a second probe request message within a maximum channel time from a time point at which the first probe request message is received from a second mobile terminal. At least one corresponding to the first probe request message and the second probe request message, when the similarity between the first probe request message and the second probe request message is analyzed and the similarity satisfies a preset criterion; Send a probe response message.

Here, the controller may receive an authentication request from the first mobile terminal and the second mobile terminal.

According to an embodiment of the present invention, when a plurality of WLAN devices request a radio link setting in a congested area, it is possible to save time for link establishment between WLAN devices. In particular, according to an embodiment of the present invention, when a plurality of mobile terminals simultaneously transmit a plurality of probe request messages, a link establishment time may be reduced by minimizing collision of probe response messages corresponding thereto. .

FIG. 1 briefly illustrates a configuration of an example of a WLAN system to which an embodiment of the present invention may be applied.

2 schematically illustrates a step in which a MS establishes a link with an AP according to an embodiment of the present invention.

3 illustrates a passive scanning step of an MS related to an embodiment of the present invention.

4 illustrates an active scanning step of an MS according to an embodiment of the present invention.

5 is a block diagram schematically illustrating a mobile station (MS) according to an embodiment of the present invention.

FIG. 6 is a block diagram schematically illustrating an access point (AP) according to an embodiment of the present invention.

FIG. 7 is a flowchart illustrating a WLAN access procedure when multiple MSs simultaneously access an AP according to an embodiment of the present invention.

FIG. 8 illustrates the detailed logic of the first analysis in the embodiment of the present invention illustrated in FIG. 7.

9 illustrates a packet structure of a beacon message transmitted by an AP of the present invention.

10 shows a packet structure of a Probe Request message transmitted by the MS of the present invention.

11 shows a packet structure of a probe response message transmitted by an AP of the present invention.

Since the embodiments described herein are intended to clearly explain the spirit of the present invention to those skilled in the art, the present invention is not limited to the embodiments described herein, and the present invention. The scope of should be construed to include modifications or variations without departing from the spirit of the invention.

The terms used in the present specification and the accompanying drawings are for easily explaining the present invention, and the shapes shown in the drawings are exaggerated and displayed to help understanding of the present invention as necessary, and thus, the present invention is used herein. It is not limited by the terms and the accompanying drawings.

In the present specification, when it is determined that a detailed description of a known configuration or function related to the present invention may obscure the gist of the present invention, a detailed description thereof will be omitted as necessary.

Hereinafter, a method and apparatus for a quick access method between WLAN devices using a plurality of communication channels according to an embodiment of the present invention will be described.

Standardization of MAC (Medium Access Control) and PHY (Physical) layer among the standards of the WLAN technology is progressing through the Institute of Electrical and Electronics Engineers (IEEE) 802.11 working group.

Referring to FIG. 1, a WLAN system includes one or

more BSSs

211 and 221. The BSSs 211 and 221 are a set of devices that can communicate with each other, and are mainly managed by one AP (Access Point, 210). MS (Mobile Station) (110, 120) is responsible for providing a wireless Internet service to the user by accessing the AP (210, 220) in accordance with the IEEE 802.11 WLAN standard.

The

BSSs

211 and 221 may be classified into an Infrastructure BSS and an Independent BSS. FIG. 1 shows an Infrastructure BSS. The BSS-1 211 is managed and operated by the AP-1 210, and one or more MSs (MS-1 110, MS-2 120) are wirelessly connected through the AP-1 210. Receiving a LAN service, the AP-1 210 is connected to the AP-2 220 through a distribution system (DS) 300. BSSs 211 and 221 connected through a single DS 300 are gathered to form an extended Extended Service Set (ESS) 410. Details of the system configuration of the WLAN are described in the IEEE Std 802.11-2012 (29, Mar. 2012) standard, and thus description thereof will be omitted. The contents of this specification are hereby incorporated by reference.

Referring to FIG. 2, the step of connecting the MS 100 to the AP 200 according to the present invention is largely divided into three steps of 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. As a method for scanning, a passive scanning technique (S101) for acquiring information using only Beacon messages periodically transmitted by the AP and the MS transmits a probe request to the AP (S103) to obtain a probe response from the AP ( S105) There is an active scanning technique for obtaining access information.

Upon successful reception of the wireless access information in the scanning step, the MS 100 transmits an authentication request (S107a) and receives an authentication response (S107b) to perform an authentication procedure. After performing a successful authentication procedure in the IEEE802.11 layer, it is possible to perform the association step (S109a, S109b), and additionally perform 802.1X-based authentication (S111) and IP address acquisition (S113) through DHCP.

Referring to FIG. 3, the MS-1 110 according to the present invention receives a beacon message periodically transmitted from the AP-1 210 and the AP-2 220 located nearby to receive wireless access information of each AP. Acquire.

Referring to FIG. 4, the MS-1 110 according to the present invention transmits a Probe Request message to acquire information of APs located in the vicinity and transmits a Probe Response message corresponding to the AP-1 210 and AP-, respectively. Received from the 2 (220) to obtain radio access information of each AP.

5 is a block diagram schematically illustrating a mobile station (MS) 100 according to an embodiment of the present invention.

Referring to FIG. 5, the MS 100 according to the present invention includes one or more network interface cards (NICs) 111 to 119 for performing a WLAN access through an AP. The NICs 111 to 119 are modules for performing a WLAN connection and may be internal or external to the MS. The NICs 111 to 119 perform wireless communication with the AP according to the WLAN standard supported by the NICs 111 through 119. The NICs 111 to 119 may operate only one NIC at the same time or operate multiple NICs 111 to 119 at the same time according to the performance and system requirements of the MS 100. In the MS 100 of the block diagram, a plurality of NICs 111 to 119 are separated from each other, and the MAC / PHY layers of the respective NICs operate independently of each other. The plurality of NICs 111 to 119 may be implemented as functional entities that are physically distinguished from each other, or may be integrated into one physical entity.

The mobile communication module 120 enables the MS 100 to transmit and receive a radio signal with an external device in a mobile communication network.

The user input 130 allows a command for controlling the MS 100 to be input by a user.

The display 140 may display a result and a state according to the operation of the MS 100 and may display information provided from the AP.

The memory 150 stores an access program for controlling access to the AP and various data according thereto.

The controller 160 controls the individual NICs 111 through 119 so that the MS 100 attempts to connect to the appropriate band using the access information received from the AP and user and system requirements. .

6 is a block diagram schematically illustrating an access point (AP) 200 according to an embodiment of the present invention.

Referring to FIG. 6, the AP 200 according to the present invention includes one or more network interface cards (NICs) 211 ˜ 219 for operating a BSS in one or more bands. The NICs 211 ˜ 219 are modules for performing a WLAN service and may be internal or external to the AP 200. The NICs 211 ˜ 219 perform wireless communication with the MS according to a standard supported by each of the WLANs. The NICs 211-219 may operate only one NIC (one of 211-219) at the same time or operate multiple NICs 211-219 at the same time according to the performance and system requirements of the AP 200. . The AP 200 of the block diagram shows a plurality of NICs 211 to 219 separated from each other, and each NIC operates independently of each other in the MAC / PHY layer. The plurality of NICs 211 to 219 may be implemented as functional entities that are physically distinguished from each other, or may be integrated into one physical entity.

The memory 250 stores a connection program for managing the connection of the MS and various data thereof.

The controller 260 controls the individual NICs 211 to 219 to access the MS with the appropriate band by using the access information of the plurality of bands and the requirements of the user and the system.

FIG. 7 is a flowchart illustrating a WLAN access procedure when a plurality of MSs simultaneously access an AP according to an embodiment of the present invention, and FIG. 8 is a detailed diagram of a first analysis in an embodiment of the present invention shown in FIG. 7. The logic is shown.

7 and 8, the first mobile terminal 100 may transmit a first probe request message (S103). The second mobile terminal 1000 may acquire (ie, overhear) the first probe request message transmitted by the first mobile terminal 100. In this case, the second mobile terminal 1000 may transmit its second probe request message within a maximum channel time MaxChannelTime from when the first probe request message is transmitted (S1003).

Meanwhile, the wireless access device 200 may receive both the first probe request message transmitted by the first mobile terminal 100 and the second probe request message transmitted by the second mobile terminal 1000. The wireless access device 200 may analyze the similarity between the first probe request message and the second probe request message (S204). For example, the wireless access device 200 may analyze the similarity based on the first service set identifier (SSID) included in the first probe request message and the second SSID included in the second probe request message. That is, the wireless access device 200 may determine that the first probe request message and the second probe request message are similar when the first SSID and the second SSID are the same.

In addition, the radio access device 200 may further analyze the similarity between probe request messages using other items besides the SSID. For example, if the probe request message includes connection requirements (ie, band information, transmission rate, load information, etc.), the wireless access device 200 may determine the first connection included in the first probe request message. It is possible to analyze the identity of the requirement and the second connection requirement included in the second probe request message. As a result, when the connection requirements are the same, it may be determined that the first probe request message and the second probe request message are similar. . Here, although the connection requirement is presented as an example of the additional analysis, the method for establishing a radio link according to an embodiment of the present invention is not limited thereto.

When the first probe request message and the second probe request message are similar, the wireless access device 200 may respond to at least one probe response message (or response) in response to the first probe request message and the second probe request message. , Beacon (beacon message) can be transmitted (S105, S105a). In this case, the wireless access device 200 may broadcast the probe response message or transmit the probe response message by specifying a destination as the first mobile terminal 100 and the second mobile terminal 1000.

When receiving the probe response message, the first mobile terminal 100 may transmit a first authentication request message to the wireless access device 200 (S107). Thereafter, the first mobile terminal 100 may access the wireless access device 200 by performing an authentication process and an association process with the wireless access device 200.

When receiving the probe response message, the second mobile terminal 1000 may transmit the second authentication request message to the wireless access device 200 (S1007). Thereafter, the second mobile terminal 1000 may access the wireless access device 200 by performing an authentication process and a connection process with the wireless access device 200.

Claims

A wireless link setting method performed in a second mobile terminal,

Obtaining a first probe request message transmitted by the first mobile terminal;

Transmitting a second probe request message within a maximum channel time (MaxChannelTime) from when transmission of the first probe request message is completed; And

And receiving one probe response message in response to the first probe request message and the second probe request message from a wireless access device.
The method according to claim 1,

The wireless link setting method,

And requesting authentication from the wireless access device by using wireless access information obtained from the probe response message.
A wireless link setting method performed in a wireless access device,

Receiving a first probe request message from a first mobile terminal;

Receiving a second probe request message within a maximum channel time (MaxChannelTime) from a time point at which the first probe request message is received from a second mobile terminal;

Analyzing the similarity between the first probe request message and the second probe request message; And

And transmitting the at least one probe response message corresponding to the first probe request message and the second probe request message when the similarity satisfies a preset criterion.
The method according to claim 3,

The wireless link setting method,

And receiving an authentication request from the first mobile terminal and the second mobile terminal.
The method according to claim 3,

The probe response message is transmitted when the service set identifier (SSID) of the first probe request message and the second probe request message match.
As a second mobile terminal,

A control unit controlling an operation of the second mobile terminal; And

At least one network interface card for transmitting and receiving data based on the command of the controller,

The control unit,

Acquire a first probe request message transmitted by the first mobile terminal, transmit a second probe request message within a maximum channel time (MaxChannelTime) from the time point at which the first probe request message is transmitted, and wirelessly connect. A second mobile terminal receiving a probe response message from the device in response to the first probe request message and the second probe request message.
The method according to claim 6,

The control unit,

And requesting authentication to the wireless access device using the wireless access information obtained from the probe response message.
As a wireless connection device,

A control unit controlling an operation of the wireless access device; And

At least one network interface card for transmitting and receiving data based on the command of the controller,

The control unit,

Receiving a first probe request message from a first mobile terminal, receiving a second probe request message within a maximum channel time (MaxChannelTime) from the time point at which the first probe request message is received from a second mobile terminal; At least one corresponding to the first probe request message and the second probe request message, when the similarity between the first probe request message and the second probe request message is analyzed and the similarity satisfies a preset criterion; A radio access device that sends a probe response message.
The method according to claim 8,

The control unit,

And receiving an authentication request from the first mobile terminal and the second mobile terminal.
The method according to claim 8,

The probe response message is transmitted when the service set identifier (SSID) of the first probe request message and the second probe request message match.