Presentation 2014-07-29
3D-MDT : What floor was the measurement made in Minimization of Drive Tests?
Haruki Izumikawa, Yuki Hirota, Daisuke Kamisaka, Chihiro Ono,
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Abstract(in Japanese) (See Japanese page)
Abstract(in English) For determining cellular coverage problems efficiently, some studies including MDT (Minimization of Drive-Tests) in 3GPP have been considering an approach whereby server of a cellular operator collects coverage information such as signal strength with location information from mobile terminals. The operator intends to rectify the problems based on the collected data, which indicates that the location information with the coverage information is of utmost importance. In addition to the 2-dimensional location information, i.e., latitude and longitude, height information (especially the floor level) is useful to the operator when taking measures. Although the GPS provides the altitude information, it could be difficult to estimate the floor level, i.e., height above ground level since the altitude information is the height above the sea level. Thus, we propose a method to estimate floor level where the coverage information is obtained for a mobile terminal equipped with a barometric pressure sensor. The mobile terminal sends the coverage information that also includes measured pressures to the server. The proposed method that works on the server estimates a floor level using the observed pressure based on the base-pressure that is the pressure at ground height. The base-pressure is estimated with respect to each spatial and time range from collected pressures. We also conducted a field trial in two areas in Tokyo by developing a logger application that records coverage information, location information and pressure on an Android smartphone, and implementing the proposed method in a server. Through the field trial, we found that the proposed method is able to estimate floor levels with a margin of error of two or three floors.
Keyword(in Japanese) (See Japanese page)
Keyword(in English) Localization / positioning / MDT (Minimization of Drive-Tests) / Floor / Barometric pressure sensor
Paper # MoNA2014-18
Date of Issue

Conference Information
Committee MoNA
Conference Date 2014/7/22(1days)
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Paper Information
Registration To Mobile Network and Applications(MoNA)
Language ENG
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) 3D-MDT : What floor was the measurement made in Minimization of Drive Tests?
Sub Title (in English)
Keyword(1) Localization
Keyword(2) positioning
Keyword(3) MDT (Minimization of Drive-Tests)
Keyword(4) Floor
Keyword(5) Barometric pressure sensor
1st Author's Name Haruki Izumikawa
1st Author's Affiliation KDDI R&D Laboratories, Inc.()
2nd Author's Name Yuki Hirota
2nd Author's Affiliation KDDI R&D Laboratories, Inc.
3rd Author's Name Daisuke Kamisaka
3rd Author's Affiliation KDDI R&D Laboratories, Inc.
4th Author's Name Chihiro Ono
4th Author's Affiliation KDDI R&D Laboratories, Inc.
Date 2014-07-29
Paper # MoNA2014-18
Volume (vol) vol.114
Number (no) 160
Page pp.pp.-
#Pages 6
Date of Issue