JP2009017321A - Detection system for mobile terminal by radio communication - Google Patents

Detection system for mobile terminal by radio communication Download PDF

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JP2009017321A
JP2009017321A JP2007177890A JP2007177890A JP2009017321A JP 2009017321 A JP2009017321 A JP 2009017321A JP 2007177890 A JP2007177890 A JP 2007177890A JP 2007177890 A JP2007177890 A JP 2007177890A JP 2009017321 A JP2009017321 A JP 2009017321A
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mobile terminal
radio
detection system
base station
acceleration sensor
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Naoyuki Fujimoto
直之 藤本
Mai Hagimoto
麻衣 萩本
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Yokogawa Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To accomplish a detection system for a mobile terminal by radio communication in which accuracy of a location can be improved without exerting a minus influence upon a resource of power consumption, radio bands, location calculation throughput or the like. <P>SOLUTION: In the detection system for the mobile terminal by radio communication wherein a fixedly disposed base station receives a radio signal periodically transmitted from a mobile terminal, the mobile terminal comprises an acceleration sensor and based on a detection value of this acceleration sensor, a transmission term of the radio signal is changed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、移動端末から周期的に送信される無線信号を、固定配置された基地局が受信する無線通信による移動端末の検出システムに関するものである。   The present invention relates to a mobile terminal detection system by radio communication in which a base station fixedly arranged receives a radio signal periodically transmitted from a mobile terminal.

移動端末から周期的に送信される無線信号を、固定配置された３個の基地局で受信し、検出される移動端末との距離情報により３辺測量法の原理で移動端末に位置を同定する無線通信による移動端末の検出システムについては、特許文献１に開示されている。   Radio signals periodically transmitted from the mobile terminal are received by three fixedly arranged base stations, and the position is identified to the mobile terminal by the principle of triangulation using distance information with the detected mobile terminal. A mobile terminal detection system by wireless communication is disclosed in Patent Document 1.

図２は、三辺測量法により移動端末の位置を同定するシステム構成図である。移動端末１０は、無線信号を送信する機能を備えた装置（ノートパソコン、携帯電話等）であり、人が身に付けて移動する。   FIG. 2 is a system configuration diagram for identifying the position of the mobile terminal by the trilateration method. The mobile terminal 10 is a device (a notebook computer, a mobile phone, or the like) having a function of transmitting a radio signal, and is worn by a person.

３個の無線基地局２１，２２，２３は、移動端末１０の無線信号を受信する機能を備えた装置（無線ＬＡＮのアクセスポイント等）で、所定の間隔で設置されており、ネットワークを介して位置計算装置３０に測定情報を渡す。   The three radio base stations 21, 22, and 23 are devices (wireless LAN access points, etc.) having a function of receiving radio signals from the mobile terminal 10, and are installed at predetermined intervals. Measurement information is passed to the position calculator 30.

３個の無線基地局２１，２２，２３は移動端末１０の無線信号を受信し、夫々の無線信号の受信強度（RSSI）または基地局から移動端末に送信される無線信号を基地局に返送する無線信号の到達時間（TDOA）を測定する。   The three radio base stations 21, 22, and 23 receive the radio signal of the mobile terminal 10, and return the reception strength (RSSI) of each radio signal or the radio signal transmitted from the base station to the mobile terminal to the base station. Measure radio signal arrival time (TDOA).

位置計算装置３０は、３個の無線基地局２１，２２，２３からの測定情報に基づいて各基地局２１，２２，２３と移動端末１０との距離を算出し、三辺測量法により移動端末１０の位置を同定する。   The position calculation device 30 calculates the distance between each base station 21, 22, 23 and the mobile terminal 10 based on the measurement information from the three radio base stations 21, 22, 23, and uses the trilateral survey method to calculate the mobile terminal. Ten positions are identified.

図３は、移動端末１０と３個の基地局２１，２２，２３との通信手順を示すタイムチャートである。以下の処理を、一定周期（Ｔ秒）で実行している。   FIG. 3 is a time chart showing a communication procedure between the mobile terminal 10 and the three base stations 21, 22, and 23. The following processing is executed at a constant cycle (T seconds).

（ａ）移動端末１０は、無線信号を周期Ｔ秒間隔で送信する。
（ｂ）無線基地局２１，２２，２３は、移動端末１０が送信した無線信号を受信して、以下のいずれか（もしくは両方）の情報を得る。
・受信強度RSSI (Received Signal Strength Indicator)
・到達時間TDOA (Time Difference Of Arival)
（ｃ）各無線基地局は受信強度・到達時間情報を、位置計算装置３０に伝送する。
（ｄ）位置計算装置３０は、取得した情報に基づいて、三辺測量法により移動端末１０の位置（座標）を同定する。 (A) The mobile terminal 10 transmits radio signals at intervals of a period T seconds.
(B) The radio base stations 21, 22, and 23 receive the radio signal transmitted by the mobile terminal 10 and obtain one (or both) of the following information.
Received strength RSSI (Received Signal Strength Indicator)
・ Time difference of Arival (TDOA)
(C) Each radio base station transmits reception intensity / arrival time information to the position calculation device 30.
(D) The position calculation device 30 identifies the position (coordinates) of the mobile terminal 10 by the trilateration method based on the acquired information.

図４は、従来の移動端末の構成例を示す機能ブロック図である。移動端末１０は、タイミング生成手段（定周期タイマ）１１を内蔵しており、一定の定周期Ｔのタイミング信号を生成する。無線送信手段１２は、このタイミング毎に無線信号を無線基地局２１，２２，２３に送信する。   FIG. 4 is a functional block diagram showing a configuration example of a conventional mobile terminal. The mobile terminal 10 includes a timing generation means (fixed cycle timer) 11 and generates a timing signal having a fixed fixed cycle T. The radio transmission means 12 transmits a radio signal to the radio base stations 21, 22 and 23 at each timing.

特開２００５−８６５７９号公報JP 2005-86579 A

従来の移動端末検出システムでは、以下のトレードオフがある。
（１）位置計算装置３０が出力する位置計算の精度を上げるためには、移動端末の通信頻度を上げる（通信間隔Ｔを小さくする）必要がある。 The conventional mobile terminal detection system has the following trade-offs.
(1) In order to increase the accuracy of the position calculation output by the position calculation device 30, it is necessary to increase the communication frequency of the mobile terminal (reducing the communication interval T).

（２）移動端末の通信頻度を上げると、以下の問題が発生する。
・移動端末の消費電力が増加する
・無線の帯域を浪費する
・位置計算装置の処理能力（ＣＰＵ資源）を浪費する (2) When the communication frequency of the mobile terminal is increased, the following problem occurs.
・ Power consumption of mobile terminal increases ・ Waste radio bandwidth ・ Waste processing power (CPU resources) of position calculation device

本発明は上述した問題点を解決するためになされたものであり、消費電力、無線帯域、位置計算処理能力等のリソースにマイナスの影響を与えることなく、位置の精度を向上させることを可能とする無線通信による移動端末の検出システムの実現を目的としている。   The present invention has been made to solve the above-described problems, and it is possible to improve the accuracy of the position without negatively affecting the resources such as the power consumption, the radio band, and the position calculation processing capability. The purpose is to realize a mobile terminal detection system by wireless communication.

このような課題を達成するために、本発明は次の通りの構成になっている。
（１）移動端末から周期的に送信される無線信号を、固定配置された基地局が受信する無線通信による移動端末の検出システムにおいて、
前記移動端末に加速度センサを設け、この加速度センサの検出値に基づいて前記無線信号の送信周期を変更することを特徴とする無線通信による移動端末の検出システム。 In order to achieve such a subject, the present invention has the following configuration.
(1) In a mobile terminal detection system by radio communication in which a base station fixedly arranged receives a radio signal periodically transmitted from a mobile terminal,
A mobile terminal detection system using wireless communication, wherein an acceleration sensor is provided in the mobile terminal, and a transmission cycle of the wireless signal is changed based on a detection value of the acceleration sensor.

（２）前記基地局が受信する無線信号の受信強度に基づいて、前記移動端末と前記基地局間の距離を検出することを特徴とする（１）に記載の無線通信による移動端末の検出システム。 (2) The mobile terminal detection system according to (1), wherein a distance between the mobile terminal and the base station is detected based on reception strength of a radio signal received by the base station. .

（３）前記基地局から前記移動端末に送信される無線信号を前記基地局に返送する時間に基づいて、前記移動端末と前記基地局間の距離を検出することを特徴とする（１）に記載の無線通信による移動端末の検出システム。 (3) The distance between the mobile terminal and the base station is detected based on a time for returning a radio signal transmitted from the base station to the mobile terminal to the base station. A mobile terminal detection system by wireless communication as described.

（４）前記移動端末から送信される無線信号を３個の基地局で受信して検出される夫々の基地局と前記移動端末間の距離情報に基づいて、前記移動端末の位置を三辺測量法により検出することを特徴とする（１）乃至（３）のいずれかに記載の無線通信による移動端末の検出システム。 (4) The position of the mobile terminal is triangulated based on distance information between the base station and the mobile terminal detected by receiving radio signals transmitted from the mobile terminal by three base stations. The mobile terminal detection system by wireless communication according to any one of (1) to (3), wherein detection is performed by a method.

（５）前記移動端末は、前記加速度センサの検出値を演算する演算手段を備え、演算結果に基づいて前記無線信号の送信周期を変更することを特徴とする（１）乃至（４）のいずれかに記載の無線通信による移動端末の検出システム。 (5) Any of (1) to (4), wherein the mobile terminal includes calculation means for calculating a detection value of the acceleration sensor, and changes a transmission cycle of the radio signal based on a calculation result. A mobile terminal detection system by wireless communication according to claim 1.

本発明によれば、次のような効果を期待することができる。
（１）加速度センサの出力が激しく変化している時は、移動端末の位置が大きく変化している可能性があるので、通信頻度を増やして位置の検出精度を高め、逆に、加速度センサの出力が変化していない場合は、移動端末の位置があまり変化していないと判断できるので、無線の通信頻度を減らして、各種リソースを節約することができる。 According to the present invention, the following effects can be expected.
(1) When the output of the acceleration sensor is changing drastically, the position of the mobile terminal may be changing greatly. Therefore, the communication frequency is increased to improve the position detection accuracy. When the output has not changed, it can be determined that the position of the mobile terminal has not changed so much, so the frequency of wireless communication can be reduced and various resources can be saved.

（２）その結果、移動端末の消費電力、無線帯域、位置計算装置の処理能力等のリソースにマイナスの影響を与えることなく、位置の検出精度を向上させることが可能となる。 (2) As a result, position detection accuracy can be improved without negatively affecting resources such as power consumption of the mobile terminal, radio band, and processing capability of the position calculation device.

以下、本発明を図面により詳細に説明する。図１は、本発明を適用した無線通信による移動端末の検出システムの一実施形態を示す機能ブロック図である。図２乃至図４で説明した従来システムと同一要素には同一符号を付して説明を省略する。   Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a functional block diagram showing an embodiment of a mobile terminal detection system by wireless communication to which the present invention is applied. The same elements as those in the conventional system described with reference to FIGS.

本発明が適用された移動端末１００は、内部に加速度センサ１０１を備えている。この加速度センサ１０１の検出値Ｓが演算手段１０２に入力される。演算手段１０２は、加速度の検出値Ｓに基づいて最適の周期信号Ｔを演算して無線送信手段１０３に出力する。   A mobile terminal 100 to which the present invention is applied includes an acceleration sensor 101 inside. The detection value S of the acceleration sensor 101 is input to the calculation means 102. The computing means 102 computes the optimum periodic signal T based on the detected acceleration value S and outputs it to the wireless transmission means 103.

演算手段１０２は、例えば、内部の加速度センサ１０１の出力値Ｓにより、以下のような処理を実行する。
(a)加速度が激しく変化している場合は、無線の送信周期Ｔを短くする。
(b)加速度が激しく変化していない場合は、無線の送信周期Ｔを長くする。 For example, the calculation means 102 executes the following processing based on the output value S of the internal acceleration sensor 101.
(a) When the acceleration changes drastically, the radio transmission period T is shortened.
(b) When the acceleration does not change drastically, the wireless transmission cycle T is lengthened.

演算手段１０２は、加速度センサ１０１の出力値Ｓの振動波形の振幅を抽出し、この振幅値に反比例または所定の非直線特性を演算した送信周期Ｔを算出する。   The calculating means 102 extracts the amplitude of the vibration waveform of the output value S of the acceleration sensor 101, and calculates a transmission cycle T in which an inversely proportional or predetermined non-linear characteristic is calculated with respect to this amplitude value.

市販されている移動端末の位置検出システムでは、検出精度を最大にするために、例えば、無線の送信周期Ｔを５msec(２００回／秒)程度に固定しているものがある。   In some mobile terminal position detection systems on the market, in order to maximize the detection accuracy, for example, the wireless transmission cycle T is fixed to about 5 msec (200 times / second).

検出精度が厳しく要求されない室内の人の移動管理システム等への適用では、移動端末に加速度センサを設けることにより、動きのない移動端末では送信周期Ｔを、例えば、２秒乃至１６秒とすることで、移動端末の電池寿命を格段に伸ばすことが可能となる。これにより、電池コスト並びに交換メンテナンスコストの削減に貢献することができる。   In application to a movement management system for indoor people where detection accuracy is not strictly required, the transmission cycle T is set to, for example, 2 to 16 seconds in a mobile terminal without movement by providing an acceleration sensor in the mobile terminal. Thus, the battery life of the mobile terminal can be greatly extended. Thereby, it can contribute to reduction of battery cost and replacement maintenance cost.

本発明を適用した移動端末の一実施形態を示す機能ブロック図である。It is a functional block diagram which shows one Embodiment of the mobile terminal to which this invention is applied. 三辺測量法により移動端末の位置を同定するシステム構成図である。It is a system block diagram which identifies the position of a mobile terminal by the three-side survey method. 移動端末と基地局との通信手順を示すタイムチャートである。It is a time chart which shows the communication procedure between a mobile terminal and a base station. 従来の移動端末の構成例を示す機能ブロック図である。It is a functional block diagram which shows the structural example of the conventional mobile terminal.

符号の説明Explanation of symbols

１００ 移動端末
１０１ 加速度センサ
１０２ 演算手段
１０３ 無線送信手段
２１，２２，２３ 無線基地局 DESCRIPTION OF SYMBOLS 100 Mobile terminal 101 Acceleration sensor 102 Calculation means 103 Wireless transmission means 21, 22, 23 Wireless base station

Claims (5)

移動端末から周期的に送信される無線信号を、固定配置された基地局が受信する無線通信による移動端末の検出システムにおいて、
前記移動端末に加速度センサを設け、この加速度センサの検出値に基づいて前記無線信号の送信周期を変更することを特徴とする無線通信による移動端末の検出システム。 In a mobile terminal detection system by radio communication in which a radio station periodically transmitted from a mobile terminal receives a fixedly arranged base station,
A mobile terminal detection system using wireless communication, wherein an acceleration sensor is provided in the mobile terminal, and a transmission cycle of the wireless signal is changed based on a detection value of the acceleration sensor. 前記基地局が受信する無線信号の受信強度に基づいて、前記移動端末と前記基地局間の距離を検出することを特徴とする請求項１に記載の無線通信による移動端末の検出システム。   The mobile terminal detection system according to claim 1, wherein a distance between the mobile terminal and the base station is detected based on reception strength of a radio signal received by the base station. 前記基地局から前記移動端末に送信される無線信号を前記基地局に返送する時間に基づいて、前記移動端末と前記基地局間の距離を検出することを特徴とする請求項１に記載の無線通信による移動端末の検出システム。   The radio according to claim 1, wherein a distance between the mobile terminal and the base station is detected based on a time for returning a radio signal transmitted from the base station to the mobile terminal to the base station. Mobile terminal detection system by communication. 前記移動端末から送信される無線信号を３個の基地局で受信して検出される夫々の基地局と前記移動端末間の距離情報に基づいて、前記移動端末の位置を三辺測量法により検出することを特徴とする請求項１乃至３のいずれかに記載の無線通信による移動端末の検出システム。   The position of the mobile terminal is detected by the trilateration method based on distance information between the base station and the mobile terminal detected by receiving radio signals transmitted from the mobile terminal at three base stations. The mobile terminal detection system by wireless communication according to any one of claims 1 to 3. 前記移動端末は、前記加速度センサの検出値を演算する演算手段を備え、演算結果に基づいて前記無線信号の送信周期を変更することを特徴とする請求項１乃至４のいずれかに記載の無線通信による移動端末の検出システム。   5. The radio according to claim 1, wherein the mobile terminal includes a calculation unit that calculates a detection value of the acceleration sensor, and changes a transmission cycle of the radio signal based on a calculation result. Mobile terminal detection system by communication.
JP2007177890A 2007-07-06 2007-07-06 Detection system for mobile terminal by radio communication Pending JP2009017321A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009049820A (en) * 2007-08-21 2009-03-05 Aruze Corp Ip telephone system
JP2014057300A (en) * 2012-08-09 2014-03-27 Ntt Docomo Inc Apparatus and method for energy efficient location sensing
US9551774B2 (en) 2013-04-23 2017-01-24 Ntt Docomo, Inc. RFID tag search method, non-transitory storage medium storing RFID tag search program, and RFID tag search device
JP2017156195A (en) * 2016-03-01 2017-09-07 Ｎｅｃプラットフォームズ株式会社 Wireless communication system, wireless communication device, position detection method, and program
JP2018036165A (en) * 2016-08-31 2018-03-08 株式会社イーアールアイ Position detecting system and mobile station

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009049820A (en) * 2007-08-21 2009-03-05 Aruze Corp Ip telephone system
JP2014057300A (en) * 2012-08-09 2014-03-27 Ntt Docomo Inc Apparatus and method for energy efficient location sensing
US9551774B2 (en) 2013-04-23 2017-01-24 Ntt Docomo, Inc. RFID tag search method, non-transitory storage medium storing RFID tag search program, and RFID tag search device
JP2017156195A (en) * 2016-03-01 2017-09-07 Ｎｅｃプラットフォームズ株式会社 Wireless communication system, wireless communication device, position detection method, and program
JP2018036165A (en) * 2016-08-31 2018-03-08 株式会社イーアールアイ Position detecting system and mobile station

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