WO2015093644A1

WO2015093644A1 - Method for controlling access point (ap) which provides location information signal

Info

Publication number: WO2015093644A1
Application number: PCT/KR2013/011799
Authority: WO
Inventors: 김남구
Original assignee: (주)피앤아이비
Priority date: 2013-12-18
Filing date: 2013-12-18
Publication date: 2015-06-25
Also published as: KR102177652B1; KR20160100300A

Abstract

The present invention relates to a method for controlling an access point (hereinafter, "AP") which relays a wireless LAN signal and, more particularly, to a control method for updating the location information of an AP which provides a location information signal. Specifically, in the present invention, when an AP transmits information on a location where the AP itself is installed, even if the location where the AP is installed is changed, the AP may detect the change and then either update, by itself, the AP's own location information configured therein according to the changed installation location or control a user to update the information. Accordingly, the present invention can maximize the reliability of the location information transmitted by the AP, thereby achieving a highest improved quality for the location identification service using the Wi-Fi signal transmitted by the AP can be obtained.

Description

Control Method of Access Point (AP) Providing Location Information Signal

The present invention relates to a control method of an access point (hereinafter referred to as an AP ") for relaying a WLAN signal, and more particularly, to a control method for updating location information of an AP providing a location information signal.

The position estimation method using the Global Positioning System (GPS) has been used in various technical fields and applications, but there is a limit in its utilization because the accuracy of the signal received from the satellite is low depending on the location. In particular, since indoors cannot receive GPS signals, there is a limit to the application of indoor location information providing service, which has recently been in the spotlight.

Recently, due to the rapid expansion of the WLAN infrastructure, a service for recognizing a location using a Wi-Fi signal, which is a transmission signal of a WLAN AP, has not been used for location recognition. That is, the location recognition service using the Wi-Fi signal, the service provider acquires a Wi-Fi fingerprint based on the Wi-Fi signal transmitted from the wireless LAN AP fixedly installed indoors or outdoors, If you provide a location-aware service environment by establishing a Wi-Fi Radio Map database (DB) by linking the coordinates of the corresponding point, the service subscriber receives a Wi-Fi signal at any point. Refer to the Wi-Fi Radio Map database to find the location of the point.

In order to provide a service for recognizing a location using such a Wi-Fi signal, the most important issue is how to build a reliable Wi-Fi signal map.

As a conventional technique for constructing a Wi-Fi signal map, a construction technique of Skyhook is known, which collects a pair of Wi-Fi fingerprints and GPS signals containing AP unique information through word driving. After that, the AP location is inferred using the accumulated information, and a Wi-Fi signal map is constructed based on the inferred AP location information and used for the location recognition service. Known as 'WPS', this method is costly, time consuming, and has an average error distance of over 40 meters, which is not very accurate. In addition, since the mobile device collects the Wi-Fi fingerprint of the AP while moving to a vehicle, there is a clear limitation in collecting the Wi-Fi fingerprint of the AP installed indoors.

In addition, various techniques for collecting a Wi-Fi signal, estimating at which point the Wi-Fi signal is transmitted, and combining the estimated position data to build a reliable Wi-Fi signal map DB (Korean Patent No. 10-1091804, Republic of Korea Patent No. 10-1144016, etc.) has been proposed, but to estimate the location of the Wi-Fi signal transmitted from a specific point and to give the location information, even if enormous time and resource investment is required There is a problem of poor accuracy.

Techniques presented in a simple manner for imparting accurate location information to Wi-Fi signals are those disclosed in US Patent Nos. 2009-0085806, 2009-0088182, 2009-0088138 (hereinafter RICHO patent). The gist of the technology disclosed in the RICHO patent is that the AP includes the location information data installed when the AP transmits the Wi-Fi signal. That is, when the encoded location information data is inserted into the broadcasted SSID area of the broadcast Wi-Fi signal format and transmitted, all surrounding terminals receiving the Wi-Fi signal refer to the location information data inserted in the SSID area. Soon you will be able to determine your location. In this case, as in the word driving (war driving) method or other conventional methods, the Wi-Fi signal location is estimated and the Wi-Fi signal map DB is separately constructed by adding information according to the estimated location for each Wi-Fi signal. This will save you a lot of hassle and cost.

However, in order to commercialize the RICOH patent technology having such a good advantage, when all APs transmit a Wi-Fi signal, location information embedded in the signal must always maintain accuracy.

APs installed indoors and outdoors can be broadly classified into APs installed by telecommunication operators, APs installed by general companies or stores, and APs installed in private homes. In order for the AP to transmit the Wi-Fi signal in which the location information is inserted, it is necessary to input and set the location information of the place where the operator is installed when the AP is installed. As a result, the AP transmits a Wi-Fi signal including location information on which the AP is installed immediately after installation. The AP installed by the telecommunications service provider does not normally change its location once it is installed, so that the location information input to the AP is not updated or changed. However, in the case of an AP installed in a company, a store, or a private home, place movement occurs due to migration. Move to a new location The installed AP needs to change the location information data recorded internally.In the case of an AP for a personal home or a store, if the owner does not care, the location information of the previously installed location is changed even though the installation location has changed. The case of transmitting the Wi-Fi signal included is frequently generated. This means that when an owner of a terminal receives a Wi-Fi signal at a specific point, the received Wi-Fi signal shows different location information for each of the received Wi-Fi signals, and thus, it may not be possible to determine which location information is correct.

Therefore, even in the case of the RICHO patent, there is a problem in that the reliability of the service cannot be guaranteed unless the location information input to the APs is updated and changed in a timely manner to reflect the movement of the APs.

Therefore, the present invention devised to solve the problems of the prior art, in the AP to send the information of the location installed in the Wi-Fi signal, when the installation location is changed automatically determine whether the location change It is an object of the present invention to provide an AP control method for inducing a user to update location information recorded in or to update a user's location information.

In order to achieve the above object, the present invention includes the steps of controlling to operate in a Wi-Fi signal reception mode when a predetermined period arrives; Extracting location information by receiving a Wi-FI signal transmitted from an external AP in the reception mode; Checking whether the location information recorded therein indicates a point close to the received location information; And correcting the location information recorded therein with the received location information or outputting a warning message if it does not indicate a close point.

The present invention can maximize the reliability of the location information transmitted by the AP by detecting the AP itself even if the installation location of the AP is changed and by updating the user's location information set in accordance with the changed installation location or by the user to update. As a result, the quality of the location service using the Wi-Fi signal transmitted by the AP is improved.

1 is a diagram illustrating a format configuration of a broadcasting signal BEACON of an AP that transmits location information together

2 is a flowchart of an AP control method according to the present invention;

1 is an exemplary configuration diagram of a broadcasting signal BEACON of an AP for transmitting location information together.

The beacon signal 10 broadcasted by the AP includes a common frame head 11, a beacon interval 12, a timestamp 13, a user identification identifier (SSID) 14, a support rate field 15, and a parameter set field. (16), a function information field (17), a traffic instruction map (18), and a CRC field (19). In general, the beacon signal 10 frame has a length of about 50 bytes.

In the case of the RICOH patent, the user setting identifier 14 (hereinafter, referred to as SSID) field of the beacon signal frame is used so that the AP transmits location information. SSID 14 is typically a user definable ASCII character. When installing the AP, the user has the authority to set the value of the SSID 14. Therefore, in the case of the AP for transmitting the location information (RICOH patent), as shown in Fig. 1, the location information is encoded into a code and inserted as part of the SSID 14. That is, two characters representing height, one character (FC) encoding a multiplier value, four characters representing a latitude value, and four characters representing a longitude value are SSID ( 14). The case shown in FIG. 1 is an example, and in addition, the installed place may be configured by inserting a zip code, a building ridge, and a number indicating a lake. It would be most desirable to have a code system that the user installing the AP could easily enter and modify.

2 is a flowchart illustrating a method for controlling an AP according to the present invention.

According to the present invention, when an AP is initially installed, an installation operator or a user can input and set location information in the SSID 14, and on the AP provided with a user menu for modifying the location information initially set even after the installation location is changed. It is assumed to be driven.

In the control method according to the present invention, the AP is set to operate in a mode of receiving a nearby Wi-Fi signal at a predetermined period during normal operation. When entering the reception mode (21), it receives all the Wi-Fi signals of the surrounding area and extracts the location information contained in the signals (22, 23). Then, the extracted location information is compared with each other, and only information that matches up to a predetermined level is selected as valid information (24). In other words, when reading the location information contained in each signal by receiving the surrounding Wi-Fi signal, the location information loaded up to a certain level is mostly determined. As shown in <Table 1> below, signal 4 is It can be seen that the location information included in the D is different from the location information of the other three signals, and in this case, it is determined that the location information of the AP that sent the signal 4 is not updated and inaccurate and is excluded from the valid signal. .

Table 1

	Location information
Signal 1	xxx-city, yyy-avenue, a-1
Signal 2	xxx-city, yyy-avenue, a-2
Signal 3	xxx-city, yyy-avenue, b-1
Signal 4	eee-city, fff-avenue, zzz

The location information determined to be valid based on the above criteria is selected, and it is checked whether the location information and the location information set to the self represent a point close to each other (25, 26). It is preferable to set the condition beforehand to what extent it is determined to indicate the proximity point. In general, if the city name and the street name match, it may be determined to indicate the proximity point.

In any case, if the location information of the selected signal and the location information recorded therein are close to each other, the location information currently recorded in the internal location is displayed. Determines that the state does not require modification and returns to the state for performing the original operation. However, if it does not indicate an adjacent point, it determines that the location information recorded inside is incorrect information and performs a function for correcting it. That is, it performs a correction operation to update the location information value determined to be valid as the location information of the Wi-Fi signal received from the surrounding location with its own location information, or outputs a warning message requesting the user to correct the location information. (27) Transition to standby mode where normal operation is not performed.

In the case where the location information is automatically corrected by the location information in the surrounding Wi-Fi signal, the Wi-Fi signal having the largest RSSI value is referred to by referring to the received signal strength indication (RSSI) value of the received signals. Select the location information value and modify the location information to be the same as the value. This is because the AP that transmits the Wi-Fi signal having the largest RSSI value can be assumed to be located closest to itself.

Even when the AP automatically corrects its location information by referring to the location information on the surrounding Wi-Fi signal, it is also possible to keep the standby state not performing normal operation while outputting a warning message to the user. Do.

In order to output warning message to user, in general, AP is connected to PC, so it sends out warning message data to connection port of PC so that AP drive program installed in PC outputs warning message when PC is turned on. desirable.

Therefore, the reliability of the location service using APs for transmitting location information by the AP control method can be greatly improved.

The present invention is applicable to a system for recognizing a location using a Wi-Fi signal which is a transmission signal of an AP.

Claims

In the control method of the AP to transmit the location information,

Operating in a Wi-Fi signal reception mode when a preset period arrives;

Extracting location information by receiving a Wi-FI signal transmitted from an external AP in the reception mode;

Checking whether the received location information and the location information recorded therein are in proximity to each other;

Correcting the location information recorded therein with the received location information value or outputting a warning message if the location is not represented as a result of the checking.

Control method of the AP comprising a.
The method according to claim 1,

And performing a step of extracting the location information, and comparing the extracted location information with each other to exclude an invalid location information value.
The method according to claim 1 or 2,

The modification of the location information recorded therein is performed by modifying the value of the location information included in the signal having the strongest RSSI among the received location information.
The method according to claim 1 or 2,

The output of the warning message is a control method of the AP, characterized in that the output continuously while maintaining the standby state to hold the normal operation until the position information recorded therein is corrected by the user.