Electronics and Telecommunications Research Institute

Sung Jo Yun

Myung In Ji

Young Su Cho

Wan Gyun Choi

Do Hyun Kim

Sang Joon Park

Dong Kyoo Kim

Youngsu Cho

Byung Doo Kim

Uzair Ahmad

A method for providing a location service and a mobile terminal are provided. The location service providing method includes determining a positioning method based on location information of the mobile terminal and measurement information used for calculating the location of the mobile terminal, determining a map switch indicator by using at least one of the determined positioning method, the location information, and the measurement information, selecting a global map (i.e., the whole area map) or a local map according to the determined map switch indicator, and indicating the location of the mobile terminal on the selected map.

Method for providing location service and mobile terminal

A method and apparatus for estimating a position of an access point (AP) includes (a) measuring a strength of a signal, transmitted by the AP, at three or more measurement points (MPs), (b) selecting an imaginary attenuation factor, (c) calculating a range between the AP and each of the MPs on the basis of the imaginary attenuation factor and a strength of a signal measured at the MP, (d) calculating an intersecting point of ranging circles in each of which a position of the MP is a center and the range between the MP and the AP is a radius, (e) calculating a best intersecting point from among a plurality of the intersecting points obtained by repeating the steps (c) and (d) while changing the imaginary attenuation factor, and (f) estimating the best intersecting point as the position of the AP.

Method and apparatus for estimating position of access point in Wi-Fi system

A terminal location measuring device includes a database for storing registration information of a plurality of access points (AP's) forming a first infrastructure system for wireless LAN-based indoor location determination. The terminal location measuring device sets a search range of a database by using location information of the terminal acquired through a second infrastructure system that is different from the first infrastructure system, an identifier of at least one of a plurality of AP's, and a signal measurement value. The terminal location measuring device extracts registration information of an AP having the same identifier as at least one AP within the search range of the database, and measures a location of the terminal by using registration information of the AP.

Device and method for measuring location of terminal

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Daejeon-si, South Korea

Sung Jo Yun