JP2007180882A - Radio communication terminal device, radio communication system, and radio communication method - Google Patents

Radio communication terminal device, radio communication system, and radio communication method Download PDF

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JP2007180882A
JP2007180882A JP2005376707A JP2005376707A JP2007180882A JP 2007180882 A JP2007180882 A JP 2007180882A JP 2005376707 A JP2005376707 A JP 2005376707A JP 2005376707 A JP2005376707 A JP 2005376707A JP 2007180882 A JP2007180882 A JP 2007180882A
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frequency band
band signal
signal
propagation delay
delay time
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Tomoaki Sadahiro
友明 貞廣
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Kyocera Corp
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Kyocera Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication terminal device, a radio communication system, and a radio communication method which allow a propagation delay time to be measured with a high precision by selecting a frequency band signal for measurement of the propagation delay time in accordance with a reception state of a prescribed frequency band signal. <P>SOLUTION: When performing processing of specifying a present position, a propagation delay time measurement part 13 determines which of a pilot signal in the band of 800 MHz and a signal in the band of 2 GHz should be used to measure the propagation delay time, on the basis of a reception signal intensity. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、現在位置を特定できる無線通信端末装置、無線通信システム及び無線通信方法に関する。   The present invention relates to a wireless communication terminal device, a wireless communication system, and a wireless communication method that can identify a current position.

近年、携帯端末にＧＰＳ（Global Positioning System：汎地球測位システム）受信機が搭載され、下記特許文献に開示されているように、携帯端末を使用して現在位置情報を取得することができるようになっている。しかし、複数のＧＰＳ衛星からの電波を受信できない状況（例えば、屋内等）ではＧＰＳを利用できない。
複数のＧＰＳ衛星からの電波を受信できない状況でも現在位置情報を取得するための技術として、ｇｐｓＯｎｅ（登録商標）がある。 In recent years, GPS (Global Positioning System) receivers are mounted on mobile terminals, and as disclosed in the following patent documents, current position information can be acquired using mobile terminals. It has become. However, GPS cannot be used in situations where radio waves from a plurality of GPS satellites cannot be received (for example, indoors).
There is gpsOne (registered trademark) as a technique for acquiring current position information even when radio waves from a plurality of GPS satellites cannot be received.

ｇｐｓＯｎｅには、ＭＳ−Ｂａｓｅｄ方式及びＭＳ−Ａｓｓｉｓｔｅｄ方式という２つの測位方式がある。
ＭＳ−Ｂａｓｅｄ方式は携帯端末が４つ以上のＧＰＳ衛星から電波を受信できる場合に使用され、ＧＰＳ衛星から取得したデータとｇｐｓＯｎｅサーバからのアシストデータを用いて、携帯端末の位置を携帯端末自身が算出する方式である。
一方、ＭＳ−Ａｓｓｉｓｔｅｄ方式は、携帯端末が３つ以下のＧＰＳ衛星からしか信号を受信できなかった場合に使用される方法である。具体的には、複数の基地局から送信されている電波を携帯端末が捕捉してパイロット信号を読み取り、基地局から携帯端末までの電波の伝搬遅延時間を測定する。この伝搬遅延時間を基に、ｇｐｓＯｎｅサーバが基地局から携帯端末までの距離を算出し、更に、３つ以上の基地局（位置情報は既知）から携帯端末までの距離を基に、ピタゴラスの定理から携帯端末の位置を算出する。 In gpsOne, there are two positioning methods, an MS-Based method and an MS-Assisted method.
The MS-Based method is used when the mobile terminal can receive radio waves from four or more GPS satellites, and the mobile terminal itself uses the data acquired from the GPS satellites and assist data from the gpsOne server to determine the position of the mobile terminal itself. This is a calculation method.
On the other hand, the MS-Assisted method is a method used when a mobile terminal can receive signals only from three or less GPS satellites. Specifically, a mobile terminal captures radio waves transmitted from a plurality of base stations, reads a pilot signal, and measures a propagation delay time of radio waves from the base station to the mobile terminal. Based on this propagation delay time, the gpsOne server calculates the distance from the base station to the mobile terminal, and further, based on the distance from three or more base stations (position information is known) to the mobile terminal, the Pythagorean theorem To calculate the position of the mobile terminal.

特開２００４−６１４６４号公報JP 2004-61464 A

すなわち、ＭＳ−Ａｓｓｉｓｔｅｄ方式では、携帯端末自身がＧＰＳ衛星を殆ど捕捉できない（捕捉衛星数が３つ以下）場合でも、複数の基地局から送信されるパイロット信号の伝搬遅延時間を用いることで位置計算を可能としている。その測位精度は数十メートル程度であり、機能が制限されている携帯端末での測位精度としては高精度であるといえる。しかし、電波の反射等によって伝搬遅延時間がずれたり、十分な数の（３つ以上の）基地局が携帯端末からの電波を受信できなかったりして、十分な数の基地局と通信を行うことができなかった場合には、十分な精度の位置測定ができない、という不利益があった。
本発明は、上述した不利益を解消するために、所定の周波数帯信号の受信状態に応じて、伝搬遅延時間を測定する周波数帯信号が選定され、精度の高い伝搬遅延時間の測定を可能にする無線通信端末装置、無線通信システム及び無線通信方法を提供することを目的とする。 That is, in the MS-Assisted method, even when the mobile terminal itself can hardly capture GPS satellites (the number of captured satellites is three or less), position calculation is performed by using propagation delay times of pilot signals transmitted from a plurality of base stations. Is possible. The positioning accuracy is about several tens of meters, and it can be said that the positioning accuracy in a portable terminal with limited functions is high. However, the propagation delay time shifts due to radio wave reflection or the like, or a sufficient number of (three or more) base stations cannot receive radio waves from the mobile terminal, and communicate with a sufficient number of base stations. If it was not possible, there was a disadvantage that the position could not be measured with sufficient accuracy.
In the present invention, in order to eliminate the disadvantages described above, a frequency band signal for measuring a propagation delay time is selected according to the reception state of a predetermined frequency band signal, thereby enabling a highly accurate measurement of the propagation delay time. An object of the present invention is to provide a wireless communication terminal device, a wireless communication system, and a wireless communication method.

本発明は上述した不利益を解消するために、第１の観点の発明の無線通信端末装置は、基地局から送信される周波数帯信号を受信する信号受信手段と、前記信号受信手段にて受信された複数の前記基地局からの周波数帯信号の伝搬遅延時間を測定する伝搬遅延時間測定手段と、を備えた無線通信端末装置であって、前記信号受信手段は、複数の周波数帯信号を受信可能に構成され、前記伝搬遅延時間測定手段は、前記複数の周波数帯信号のうちの所定の周波数帯信号を送信する複数の前記基地局から送信されて前記信号受信手段にて受信される前記所定の周波数帯信号の前記伝搬遅延時間を測定するとともに、前記所定の周波数帯信号の受信状態が所定の条件を満足しない場合には、前記複数の周波数帯信号のうちの前記所定の周波数帯信号以外の周波数帯信号を送信する前記基地局から送信されて前記信号受信手段にて受信される当該周波数帯信号の前記伝搬遅延時間を測定する。   In order to eliminate the above-mentioned disadvantages, the present invention provides a wireless communication terminal device according to a first aspect of the present invention, comprising: a signal receiving unit that receives a frequency band signal transmitted from a base station; And a propagation delay time measuring means for measuring propagation delay times of frequency band signals from the plurality of base stations, wherein the signal receiving means receives the plurality of frequency band signals. The propagation delay time measuring means is configured to be transmitted from the plurality of base stations that transmit a predetermined frequency band signal of the plurality of frequency band signals and received by the signal receiving means. And measuring the propagation delay time of the predetermined frequency band signal, and if the reception state of the predetermined frequency band signal does not satisfy a predetermined condition, the predetermined frequency band signal of the plurality of frequency band signals The frequency band signal of the external is transmitted from the base station transmitting to measure the propagation delay time of the frequency band signal received by said signal receiving means.

好適には、前記伝搬遅延時間測定手段は、前記所定の周波数帯信号を送信する複数の基地局からの前記所定周波数帯信号の前記信号受信手段での受信基地局数が所定値以上であるときに、前記所定の条件を満足すると判定する。   Preferably, the propagation delay time measuring means is configured such that the number of base stations receiving the predetermined frequency band signals from the plurality of base stations transmitting the predetermined frequency band signals at the signal receiving means is greater than or equal to a predetermined value. Then, it is determined that the predetermined condition is satisfied.

好適には、前記伝搬遅延時間測定手段は、前記信号受信手段での前記所定周波数帯信号の前記受信基地局数が前記所定値以上である場合に、前記信号受信手段にて受信される前記所定周波数帯信号のうち電界強度の変動が基準値未満である前記所定周波数帯信号の受信基地局数が前記所定値未満であるときに前記所定の条件を満足しないと判定する。   Preferably, the propagation delay time measurement unit is configured to receive the predetermined signal received by the signal reception unit when the number of reception base stations of the predetermined frequency band signal at the signal reception unit is equal to or greater than the predetermined value. It is determined that the predetermined condition is not satisfied when the number of base stations receiving the predetermined frequency band signal whose electric field strength fluctuation is less than a reference value among the frequency band signals is less than the predetermined value.

好適には、前記伝搬遅延時間測定手段は、前記信号受信手段での前記所定周波数帯信号の前記受信基地局数が前記所定値以上である場合に、前記信号受信手段にて受信される前記所定周波数帯信号のうち受信強度が基準値以上である前記所定周波数帯信号の受信基地局数が前記所定値未満であるときに前記所定の条件を満足しないと判定する。   Preferably, the propagation delay time measurement unit is configured to receive the predetermined signal received by the signal reception unit when the number of reception base stations of the predetermined frequency band signal at the signal reception unit is equal to or greater than the predetermined value. It is determined that the predetermined condition is not satisfied when the number of receiving base stations of the predetermined frequency band signal whose reception intensity is greater than or equal to a reference value among the frequency band signals is less than the predetermined value.

好適には、前記伝搬遅延時間測定手段は、前記信号受信手段での前記所定周波数帯信号の前記受信基地局数が前記所定値以上である場合に、前記所定値の基地局から送信される前記所定周波数帯信号の前記伝搬遅延時間を測定し、前記信号受信手段での前記所定周波数帯信号の前記受信基地局数が前記所定値未満である場合には、前記信号受信手段にて受信される前記所定周波数帯信号と前記所定周波数帯信号以外の周波数帯信号を送信する前記基地局からの前記所定周波数帯信号以外の周波数帯信号とのうちの前記所定値の周波数帯信号の前記伝搬遅延時間を測定する。   Preferably, the propagation delay time measuring means is transmitted from the base station having the predetermined value when the number of the receiving base stations of the predetermined frequency band signal in the signal receiving means is equal to or greater than the predetermined value. The propagation delay time of a predetermined frequency band signal is measured, and when the number of receiving base stations of the predetermined frequency band signal at the signal receiving means is less than the predetermined value, the signal receiving means receives the signal. The propagation delay time of the predetermined frequency band signal of the predetermined frequency band signal and the frequency band signal other than the predetermined frequency band signal from the base station that transmits the frequency band signal other than the predetermined frequency band signal Measure.

好適には、前記伝搬遅延時間測定手段は、前記信号受信手段で受信される前記所定の周波数帯信号の受信状態が前記所定の条件を満足しない場合、前記信号受信手段にて受信される前記所定の周波数帯信号と前記所定周波数帯信号以外の周波数帯信号を送信する前記基地局からの前記所定周波数帯信号以外の周波数帯信号とのうちの電界強度の変動が比較して小さい周波数帯信号を送信する基地局を前記所定値だけ選定し、この選定された基地局から送信されて前記信号受信手段にて受信された周波数帯信号の前記伝搬遅延時間を測定する。   Preferably, the propagation delay time measuring unit receives the predetermined signal received by the signal receiving unit when a reception state of the predetermined frequency band signal received by the signal receiving unit does not satisfy the predetermined condition. A frequency band signal having a smaller variation in electric field strength between the frequency band signal of the base station and the frequency band signal other than the predetermined frequency band signal from the base station that transmits the frequency band signal other than the predetermined frequency band signal. The base station to be transmitted is selected by the predetermined value, and the propagation delay time of the frequency band signal transmitted from the selected base station and received by the signal receiving means is measured.

好適には、前記伝搬遅延時間測定手段は、前記信号受信手段で受信される前記所定の周波数帯信号の受信状態が前記所定の条件を満足しない場合、前記信号受信手段にて受信される前記所定の周波数帯信号と前記所定周波数帯信号以外の周波数帯信号を送信する前記基地局からの前記所定周波数帯信号以外の周波数帯信号とのうちの受信強度が比較して大きい周波数帯信号を送信する基地局を前記所定値だけ選定し、この選定された基地局から送信されて前記信号受信手段にて受信された周波数帯信号の前記伝搬遅延時間を測定する。   Preferably, the propagation delay time measuring unit receives the predetermined signal received by the signal receiving unit when a reception state of the predetermined frequency band signal received by the signal receiving unit does not satisfy the predetermined condition. Transmitting a frequency band signal having a higher reception strength than the frequency band signal other than the predetermined frequency band signal from the base station that transmits a frequency band signal other than the predetermined frequency band signal. The base station is selected by the predetermined value, and the propagation delay time of the frequency band signal transmitted from the selected base station and received by the signal receiving means is measured.

第２の観点の発明の無線通信システムは、複数の周波数帯信号を送信する複数の基地局と、前記複数の基地局からの周波数帯信号の伝搬遅延時間を測定する無線通信端末装置と、前記伝搬遅延時間を基に、前記無線通信端末装置の現在位置を算出するサーバとを備えた無線通信システムであって、前記無線通信端末装置は、前記複数の基地局から送信される周波数帯信号を受信する信号受信手段と、前記信号受信手段にて受信された前記複数の基地局からの周波数帯信号の前記伝搬遅延時間を測定する伝搬遅延時間測定手段と、を備え、前記信号受信手段は、複数の周波数帯信号を受信可能に構成され、前記伝搬遅延時間測定手段は、前記複数の周波数帯信号のうちの所定の周波数帯信号を送信する複数の前記基地局から送信されて前記信号受信手段にて受信される前記所定の周波数帯信号の前記伝搬遅延時間を測定するとともに、前記所定の周波数帯信号の受信状態が所定の条件を満足しない場合には、前記複数の周波数帯信号のうちの前記所定の信号以外の周波数帯信号を送信する前記基地局から送信されて前記信号受信手段にて受信される当該周波数帯信号の前記伝搬遅延時間を測定する。   A wireless communication system according to a second aspect of the invention includes a plurality of base stations that transmit a plurality of frequency band signals, a wireless communication terminal device that measures propagation delay times of frequency band signals from the plurality of base stations, A wireless communication system comprising a server that calculates a current position of the wireless communication terminal device based on a propagation delay time, wherein the wireless communication terminal device receives frequency band signals transmitted from the plurality of base stations. Receiving signal receiving means, and propagation delay time measuring means for measuring the propagation delay time of the frequency band signals from the plurality of base stations received by the signal receiving means, the signal receiving means, The propagation delay time measuring means is configured to be capable of receiving a plurality of frequency band signals, and the propagation delay time measuring means is transmitted from the plurality of base stations that transmit a predetermined frequency band signal among the plurality of frequency band signals. And measuring the propagation delay time of the predetermined frequency band signal received by the communication means, and if the reception state of the predetermined frequency band signal does not satisfy the predetermined condition, The propagation delay time of the frequency band signal transmitted from the base station that transmits a frequency band signal other than the predetermined signal and received by the signal receiving means is measured.

第３の観点の発明の無線通信方法は、基地局から送信される所定の周波数帯信号を受信する第１の工程と、前記所定の周波数帯信号の受信状態が所定の条件を満たすか否かを判断する第２の工程と、前記第２の工程において、所定の条件を満たすと判断された場合には、前記所定の周波数帯信号を送信する複数の前記基地局から送信されて前記信号受信手段にて受信される前記所定の周波数帯信号の前記伝搬遅延時間を測定する第３の工程と、前記第２の工程において、所定の条件を満たさないと判断された場合には、前記所定の周波数帯信号以外の周波数帯信号を送信する前記基地局から送信されて前記信号受信手段にて受信される当該周波数帯信号の前記伝搬遅延時間を測定する第４の工程とを有する。   The wireless communication method of the third aspect of the invention includes a first step of receiving a predetermined frequency band signal transmitted from a base station, and whether or not a reception state of the predetermined frequency band signal satisfies a predetermined condition. In the second step of determining and the second step, when it is determined that a predetermined condition is satisfied, the signal reception is performed by transmitting from the plurality of base stations transmitting the predetermined frequency band signal. In the third step of measuring the propagation delay time of the predetermined frequency band signal received by the means, and in the second step, if it is determined that the predetermined condition is not satisfied, And a fourth step of measuring the propagation delay time of the frequency band signal transmitted from the base station that transmits a frequency band signal other than the frequency band signal and received by the signal receiving unit.

所定の周波数帯信号の受信状態に応じて、伝搬遅延時間を測定する周波数帯信号が選定され、精度の高い伝搬遅延時間の測定を可能にする無線通信端末装置、無線通信システム及び無線通信方法を提供する。   A radio communication terminal apparatus, a radio communication system, and a radio communication method are provided, in which a frequency band signal for measuring a propagation delay time is selected according to a reception state of a predetermined frequency band signal, and a highly accurate propagation delay time can be measured. provide.

＜第１実施形態＞
以下、本発明の実施形態について説明する。
図１は、本実施形態の通信システム１００について説明するための図である。
本実施形態の通信システム１００は、図１に示すように、携帯端末１、複数の基地局２を有する通信網２００、ｇｐｓＯｎｅサーバ３、ＧＰＳ衛星４によって構成される。 <First Embodiment>
Hereinafter, embodiments of the present invention will be described.
FIG. 1 is a diagram for explaining a communication system 100 according to the present embodiment.
As shown in FIG. 1, the communication system 100 according to the present embodiment includes a mobile terminal 1, a communication network 200 having a plurality of base stations 2, a gpsOne server 3, and a GPS satellite 4.

携帯端末１は、無線等により基地局２とデータ通信を行う。データ通信には、例えば、音声通話や、メール等のメッセージデータが含まれる。
また、本実施形態の携帯端末１はＧＰＳ機能を有し、ＧＰＳ衛星４の発する電波を受信して測位計算を行う。正確に（３次元の）測位計算を行うためには、４つ以上のＧＰＳ衛星４からの電波を受信する必要がある（２次元的な測位であれば３つのＧＰＳ衛星４からの電波だけでよい）。ただし、４つ以上のＧＰＳ衛星からの電波を受信できない場合でも、後述するように、携帯端末１から基地局２までの距離を３つ以上測定することにより、ｇｐｓＯｎｅサーバに現在位置を算出させることができる。
なお、携帯端末１の構成については後述する。 The mobile terminal 1 performs data communication with the base station 2 by wireless or the like. Data communication includes, for example, voice call and message data such as e-mail.
In addition, the mobile terminal 1 according to the present embodiment has a GPS function and receives a radio wave emitted from the GPS satellite 4 to perform positioning calculation. In order to perform accurate (three-dimensional) positioning calculation, it is necessary to receive radio waves from four or more GPS satellites 4 (in the case of two-dimensional positioning, only radio waves from three GPS satellites 4 are received. Good). However, even when radio waves from four or more GPS satellites cannot be received, the gpsOne server can calculate the current position by measuring three or more distances from the mobile terminal 1 to the base station 2 as described later. Can do.
The configuration of the mobile terminal 1 will be described later.

基地局２は、例えば数ｋｍ〜数十ｋｍ間隔で設置され、携帯端末１と通信網２００との通信を媒介する通信網２００の末端通信装置である。
なお、本実施形態では、基地局２が携帯端末１と通信を行う際に使用する無線周波数が２種類ある。すなわち、８００ＭＨｚの周波数帯を使用する基地局２１と、２ＧＨｚの周波数帯を使用する基地局２２とが存在する。
通信網２００は、例えば、ＣＤＭＡ（Code Division Multiple Access：符号分割多重接続）方式等の携帯電話ネットワークであり、データの伝送を行う。 The base station 2 is a terminal communication device of the communication network 200 that is installed, for example, at intervals of several kilometers to several tens of kilometers and mediates communication between the mobile terminal 1 and the communication network 200.
In the present embodiment, there are two types of radio frequencies used when the base station 2 communicates with the mobile terminal 1. That is, there is a base station 21 that uses a frequency band of 800 MHz and a base station 22 that uses a frequency band of 2 GHz.
The communication network 200 is a mobile phone network such as a CDMA (Code Division Multiple Access) system, and transmits data.

ｇｐｓＯｎｅサーバ３は、携帯端末１が十分な数（４つ）のＧＰＳ衛星４から電波を受信できなかった場合には、ＭＳ−Ａｓｓｉｓｔｅｄ方式によって携帯端末１の位置を算出して携帯端末１に通知する。
以下、ＭＳ−Ａｓｓｉｓｔｅｄ方式について説明する。
ＭＳ−Ａｓｓｉｓｔｅｄ方式は、携帯端末１が３つ以下のＧＰＳ衛星４からの信号しか受信できなかった場合に、携帯端末１と基地局２との間の電波の伝搬遅延時間等を測定し、携帯端末１の位置をｇｐｓＯｎｅサーバ３が算出する方式である。 The gpsOne server 3 calculates the position of the mobile terminal 1 by the MS-Assisted method and notifies the mobile terminal 1 when the mobile terminal 1 cannot receive radio waves from a sufficient number (four) of the GPS satellites 4. To do.
Hereinafter, the MS-Assisted method will be described.
The MS-Assisted method measures the propagation delay time of radio waves between the mobile terminal 1 and the base station 2 when the mobile terminal 1 can only receive signals from three or less GPS satellites 4. In this method, the position of the terminal 1 is calculated by the gpsOne server 3.

位置情報の算出は、次のように行う。
まず、ｇｐｓＯｎｅサーバ３が、伝搬遅延時間測定用パラメータを携帯端末１に送信する。伝搬遅延時間測定用パラメータは、ｇｐｓＯｎｅサーバ３がＧＰＳ衛星４と通信して得た正確な時間情報等を含んでおり、携帯端末１が、複数の基地局２から送信されている電波からパイロット信号を読み取り、パイロット信号に含まれる時間情報と伝搬遅延時間測定用パラメータに含まれる正確な時間情報とから、それぞれの基地局２からの電波の伝搬遅延時間を測定する。ｇｐｓＯｎｅサーバ３は、複数の伝搬遅延時間情報を基に、携帯端末１からそれぞれの基地局までの距離を算出する。ここで携帯端末１からの距離が算出できた基地局２が３つ以上ある場合、ｇｐｓＯｎｅサーバ３はピタゴラスの定理から携帯端末１の位置を特定することができる。 The position information is calculated as follows.
First, the gpsOne server 3 transmits a propagation delay time measurement parameter to the mobile terminal 1. The parameters for measuring the propagation delay time include accurate time information obtained by the gpsOne server 3 communicating with the GPS satellite 4, and the portable terminal 1 transmits pilot signals from radio waves transmitted from the plurality of base stations 2. And the propagation delay time of the radio wave from each base station 2 is measured from the time information included in the pilot signal and the accurate time information included in the propagation delay time measurement parameter. The gpsOne server 3 calculates the distance from the mobile terminal 1 to each base station based on a plurality of propagation delay time information. Here, when there are three or more base stations 2 from which the distance from the portable terminal 1 can be calculated, the gpsOne server 3 can specify the position of the portable terminal 1 from the Pythagorean theorem.

本実施形態では、携帯端末１は、周波数８００ＭＨｚの電波を使用する基地局２１と、周波数２ＧＨｚの電波を使用する基地局２２との両方の基地局からの電波の伝搬遅延時間を測定し、ｇｐｓＯｎｅサーバ３は、それぞれの周波数帯の基地局の伝搬遅延情報を基にそれぞれの基地局から携帯端末１までの距離を算出する。携帯端末１が行う、どちらの周波数帯の基地局からの電波の伝搬遅延情報を測定するかを決定する処理については、後に詳述する。   In the present embodiment, the mobile terminal 1 measures the propagation delay time of radio waves from both the base station 21 using a radio wave with a frequency of 800 MHz and the base station 22 using a radio wave with a frequency of 2 GHz, and gpsOne The server 3 calculates the distance from each base station to the mobile terminal 1 based on the propagation delay information of the base station in each frequency band. A process performed by the mobile terminal 1 for determining which frequency band from which the radio wave propagation delay information is measured will be described in detail later.

ＧＰＳ衛星４は、衛星自身の正確な軌道情報及び時計の補正情報であるエフェメリス情報と、全衛星のおおまかな軌道情報であるアルマナック情報を一定間隔で更新して送信している。携帯端末１やその他のＧＰＳ受信機は、これらの情報を基に各ＧＰＳ衛星からの距離を算出し、現在位置の特定を行う。   The GPS satellite 4 updates the ephemeris information which is accurate orbit information of the satellite itself and the correction information of the clock and the almanac information which is rough orbit information of all the satellites at regular intervals and transmits them. The portable terminal 1 and other GPS receivers calculate the distance from each GPS satellite based on these pieces of information, and specify the current position.

次に、携帯端末１の構成について説明する。
図２は、携帯端末１の構成の一例を示すブロック図である。
図２に示すように、携帯端末１は、アンテナ１１、送受信部１２、伝搬遅延時間測定部１３を有する。 Next, the configuration of the mobile terminal 1 will be described.
FIG. 2 is a block diagram illustrating an example of the configuration of the mobile terminal 1.
As illustrated in FIG. 2, the mobile terminal 1 includes an antenna 11, a transmission / reception unit 12, and a propagation delay time measurement unit 13.

アンテナ１１は、８００ＭＨｚの周波数帯の電波と、２ＧＨｚの周波数帯の電波を介して、８００ＭＨｚ帯及び２ＧＨｚ帯それぞれの基地局との通信を行うためのアンテナである。
なお、本実施形態ではアンテナ１１は１つで８００ＭＨｚと２ＧＨｚ両方の電波を送受信しているが、周波数帯ごとに２本のアンテナがあってもよい。 The antenna 11 is an antenna for communicating with base stations in the 800 MHz band and the 2 GHz band via radio waves in the 800 MHz frequency band and radio waves in the 2 GHz frequency band.
In the present embodiment, one antenna 11 transmits and receives both 800 MHz and 2 GHz radio waves, but there may be two antennas for each frequency band.

送受信部１２は、８００ＭＨｚ帯の基地局２１と通信を行うために８００ＭＨｚ帯の信号を、２ＧＨｚ帯の基地局２２と通信を行うために２ＧＨｚ帯の信号を、アンテナ１１を介して送受信する。
特に、送受信部１２は、携帯端末１の現在位置を特定するために必要なパラメータである伝搬遅延時間測定用パラメータを測定するためのパイロット信号を各基地局から受信する。また、ｇｐｓＯｎｅサーバ３に携帯端末１の現在位置を特定させるために、測定した伝搬遅延時間情報を基地局２に送信する。 The transmission / reception unit 12 transmits and receives an 800 MHz band signal to communicate with the 800 MHz band base station 21 and a 2 GHz band signal to communicate with the 2 GHz base station 22 via the antenna 11.
In particular, the transmission / reception unit 12 receives a pilot signal for measuring a propagation delay time measurement parameter, which is a parameter necessary for specifying the current position of the mobile terminal 1, from each base station. In addition, the measured propagation delay time information is transmitted to the base station 2 in order to cause the gpsOne server 3 to identify the current position of the mobile terminal 1.

伝搬遅延時間測定部１３は、アンテナ１１及び送受信部１２を介して行った複数の基地局と通信を行い得たパイロット信号を基に、上述したＭＳ−Ａｓｓｉｓｔｅｄ方式によって携帯端末１の現在位置を特定するために、複数の基地局からの信号の伝搬遅延時間を測定する。
現在位置特定の処理を行う際、伝搬遅延時間測定部１３は、後述する判断基準に従って、８００ＭＨｚ帯のパイロット信号を使用して伝搬遅延時間を測定するか、２ＧＨｚ帯の信号を使用して伝搬遅延時間を測定するかの判断を行う。 The propagation delay time measurement unit 13 identifies the current position of the mobile terminal 1 by the above-described MS-Assisted method based on pilot signals that can be communicated with a plurality of base stations performed via the antenna 11 and the transmission / reception unit 12. In order to do this, the propagation delay times of signals from a plurality of base stations are measured.
When performing the process of specifying the current position, the propagation delay time measurement unit 13 measures the propagation delay time using a pilot signal in the 800 MHz band or uses the signal in the 2 GHz band according to a determination criterion described later. Determine whether to measure time.

以下、伝搬遅延時間測定部１３の現在位置特定処理の際の、どの周波数帯のパイロット信号を利用して伝搬遅延時間を測定するかの判断基準について説明する。
図３は、伝搬遅延時間測定部１３が使用する周波数の判断を行う際のフローチャートである。 Hereinafter, criteria for determining which frequency band of the pilot signal to use to measure the propagation delay time in the current position specifying process of the propagation delay time measurement unit 13 will be described.
FIG. 3 is a flowchart for determining the frequency used by the propagation delay time measurement unit 13.

ステップＳＴ１：
伝搬遅延時間測定部１３は、送受信部１２が所定の周波数帯信号である８００ＭＨｚ帯のパイロット信号を３つ以上の基地局から受信できているかを判断し、できていると判断した場合はステップＳＴ２に進み、受信できていないと判断した場合はステップＳＴ３に進む。 Step ST1:
The propagation delay time measurement unit 13 determines whether or not the transmission / reception unit 12 has received a pilot signal in the 800 MHz band, which is a predetermined frequency band signal, from three or more base stations. If it is determined that the signal has not been received, the process proceeds to step ST3.

ステップＳＴ２：
伝搬遅延時間測定部１３は、送受信部１２がマルチパスフェージングの影響が所定の大きさ以下である８００ＭＨｚ帯パイロット信号を３つ以上の基地局から受信できているか否かを判断し、できていると判断した場合はステップＳＴ４に進み、できていないと判断した場合はステップＳＴ５に進む。
マルチパスとは、基地局から送信された電波が建物や地形などの障害物によって反射・回折し、携帯端末１を含む移動端末やテレビ等が複数の経路から同じ電波を受信してしまうことを言い、マルチパスフェージングとは、マルチパス環境化においては電波の伝搬経路が異なり、経路ごとに電波の到達時間にずれが生じるため、移動端末やテレビ等の受信電界強度が変動してしまう現象である。
伝搬遅延時間測定部１３は、本ステップにおいて、送受信部１２が受信した各基地局からの８００ＭＨｚ帯パイロット信号の受信電界強度を測定し、この受信電界強度の変動が所定値以下である場合に、マルチパスフェージングの影響が所定の大きさ以下であると判断する。なお、所定値の決定方法については本発明では限定しない。 Step ST2:
The propagation delay time measurement unit 13 is configured to determine whether or not the transmission / reception unit 12 has received an 800 MHz band pilot signal whose influence of multipath fading is not greater than a predetermined magnitude from three or more base stations. If it is determined, the process proceeds to step ST4. If it is determined that the process is not completed, the process proceeds to step ST5.
Multipath means that radio waves transmitted from a base station are reflected and diffracted by obstacles such as buildings and terrain, and mobile terminals including the mobile terminal 1 and televisions receive the same radio waves from multiple paths. In other words, multipath fading is a phenomenon in which the propagation path of radio waves differs in a multipath environment, and the arrival time of radio waves varies depending on the path, so that the received electric field strength of mobile terminals and televisions fluctuates. is there.
In this step, the propagation delay time measurement unit 13 measures the reception electric field strength of the 800 MHz band pilot signal from each base station received by the transmission / reception unit 12, and when the variation of the reception electric field strength is equal to or less than a predetermined value, It is determined that the influence of multipath fading is not more than a predetermined magnitude. The method for determining the predetermined value is not limited in the present invention.

ステップＳＴ３：
伝搬遅延時間測定部１３は、送受信部１２が８００ＭＨｚ帯のパイロット信号と２ＧＨｚ帯のパイロット信号とを合わせて３つ以上の基地局から受信できているか否かを判断し、できていると判断した場合はステップＳＴ５に進み、できていないと判断した場合は伝搬遅延時間測定処理が不可能であると判断し、処理を終了する。
ステップＳＴ４：
伝搬遅延時間測定部１３は、送受信部１２が３つ以上の基地局から受信した８００ＭＨｚ帯の各パイロット信号の受信電界強度を測定し、ステップＳＴ２で受信電界強度の変動が所定値以下であると判定された当該パイロット信号が、十分な強度で受信できているか否かを判断して、できていると判断した場合はステップＳＴ６に進み、できていないと判断した場合はステップＳＴ５に進む。 Step ST3:
The propagation delay time measurement unit 13 determines whether or not the transmission / reception unit 12 has received the 800 MHz band pilot signal and the 2 GHz band pilot signal from three or more base stations, and determines that the transmission is possible. If this is the case, the process proceeds to step ST5. If it is determined that the propagation delay time measurement process is not possible, it is determined that the propagation delay time measurement process is impossible, and the process ends.
Step ST4:
The propagation delay time measurement unit 13 measures the reception field strength of each pilot signal in the 800 MHz band received by the transmission / reception unit 12 from three or more base stations, and the variation in the reception field strength is equal to or less than a predetermined value in step ST2. It is determined whether or not the determined pilot signal has been received with sufficient strength. If it is determined that the pilot signal has been received, the process proceeds to step ST6. If it is determined that the pilot signal has not been received, the process proceeds to step ST5.

ステップＳＴ５：
伝搬遅延時間測定部１３は、送受信部１２が受信した８００ＭＨｚ帯パイロット信号と２ＧＨｚ帯パイロット信号の受信電界強度の変動を測定し、マルチパスフェージングの影響が所定の大きさ以下である信号を３つ以上の基地局から受信できているか否かを判断する。できていると判断した場合はステップＳＴ７に進み、できていないと判断した場合はステップＳＴ８に進む。
ステップＳＴ６：
伝搬遅延時間測定部１３は、ステップＳＴ２において測定した各８００ＭＨｚ帯パイロット信号の受信電界強度の変動を基に、マルチパスフェージングの影響が小さいパイロット信号を発している基地局を、小さい順に３つ選択する。 Step ST5:
The propagation delay time measurement unit 13 measures fluctuations in the received electric field strength of the 800 MHz band pilot signal and the 2 GHz band pilot signal received by the transmission / reception unit 12, and determines three signals whose influence of multipath fading is less than a predetermined magnitude. It is determined whether or not reception is possible from the above base stations. If it is determined that it has been completed, the process proceeds to step ST7.
Step ST6:
Propagation delay time measurement unit 13 selects three base stations emitting pilot signals that are less affected by multipath fading based on the variation in received field strength of each 800 MHz band pilot signal measured in step ST2. To do.

ステップＳＴ７：
伝搬遅延時間測定部１３は、ステップＳＴ５において測定した各８００ＭＨｚ帯パイロット信号及び２ＧＨｚ帯パイロット信号の受信電界強度の変動を基に、マルチパスフェージングの影響が小さいパイロット信号を発している基地局を、小さい順に３つ選択する。
ステップＳＴ８：
伝搬遅延時間測定部１３は、送受信部１２が受信した８００ＭＨｚ帯パイロット信号及び２ＧＨｚ帯パイロット信号の受信電界強度の受信電界強度を測定し、受信強度が強いパイロット信号を発している基地局を強い順に３つ選択する。 Step ST7:
The propagation delay time measurement unit 13 determines a base station that emits a pilot signal that is less affected by multipath fading based on fluctuations in received electric field strength of each 800 MHz band pilot signal and 2 GHz band pilot signal measured in step ST5. Select three in ascending order.
Step ST8:
The propagation delay time measurement unit 13 measures the reception field strength of the reception field strengths of the 800 MHz band pilot signal and the 2 GHz band pilot signal received by the transmission / reception unit 12, and selects the base stations that are emitting pilot signals with strong reception strength in order of strength. Select three.

ステップＳＴ９：
伝搬遅延時間測定部１３は、ステップＳＴ６〜８のいずれかで選択した３つの基地局からのパイロット信号を基に、携帯端末１とそれぞれの基地局２との伝搬遅延時間を測定する。 Step ST9:
The propagation delay time measurement unit 13 measures the propagation delay time between the mobile terminal 1 and each base station 2 based on the pilot signals from the three base stations selected in any of steps ST6 to ST8.

伝搬遅延時間測定部１３は、以上のようにして携帯端末１とそれぞれの基地局２との伝搬遅延時間を測定する。   The propagation delay time measurement unit 13 measures the propagation delay time between the mobile terminal 1 and each base station 2 as described above.

以下、携帯端末１の測位処理時の通信システム１００の動作例について説明する。
図４は、携帯端末１の測位処理時の通信システム１００の動作例を説明するためのシーケンス図である。 Hereinafter, an operation example of the communication system 100 during the positioning process of the mobile terminal 1 will be described.
FIG. 4 is a sequence diagram for explaining an operation example of the communication system 100 during the positioning process of the mobile terminal 1.

ステップＳＴ１１：
携帯端末１は、４つ以上の数のＧＰＳ衛星４から信号を受信できるか否かの判断を行う。
本シーケンスでは、３つ以下のＧＰＳ衛星からの信号しか受信できなかった場合について説明する。
ステップＳＴ１２：
携帯端末１は、測位開始要求信号をｇｐｓＯｎｅサーバ３に送信する。 Step ST11:
The mobile terminal 1 determines whether or not signals can be received from four or more GPS satellites 4.
In this sequence, a case where only signals from three or less GPS satellites can be received will be described.
Step ST12:
The mobile terminal 1 transmits a positioning start request signal to the gpsOne server 3.

ステップＳＴ１３：
ｇｐｓＯｎｅサーバ３は、伝搬遅延時間測定用パラメータを携帯端末１に送信する。
ステップＳＴ１４：
携帯端末１は、８００ＭＨｚ帯基地局２１及び２ＧＨｚ帯基地局２２からのパイロット信号と、ステップＳＴ１３で得た伝搬遅延時間測定用パラメータとから、３つの基地局からの伝搬遅延時間を測定する。なお、この際のどちらの基地局の信号を利用するかを判断する処理は、図３を参照して上述した通りである。 Step ST13:
The gpsOne server 3 transmits a propagation delay time measurement parameter to the mobile terminal 1.
Step ST14:
The mobile terminal 1 measures the propagation delay times from the three base stations from the pilot signals from the 800 MHz band base station 21 and the 2 GHz band base station 22 and the propagation delay time measurement parameters obtained in step ST13. Note that the process of determining which base station signal to use at this time is as described above with reference to FIG.

ステップＳＴ１５：
携帯端末１は、伝搬遅延時間の測定結果をｇｐｓＯｎｅサーバ３へ送信する。
ステップＳＴ１６：
ｇｐｓＯｎｅサーバ３は、携帯端末１からの伝搬遅延時間の測定結果を基に、携帯端末１の現在位置を算出する。 Step ST15:
The portable terminal 1 transmits the measurement result of the propagation delay time to the gpsOne server 3.
Step ST16:
The gpsOne server 3 calculates the current position of the mobile terminal 1 based on the measurement result of the propagation delay time from the mobile terminal 1.

ステップＳＴ１７：
ｇｐｓＯｎｅサーバ３は、携帯端末１に現在位置情報を送信する。 Step ST17:
The gpsOne server 3 transmits the current position information to the mobile terminal 1.

以上説明したように、本実施形態の携帯端末１によれば、伝搬遅延時間測定部１３が、８００ＭＨｚ帯基地局２１からの信号を十分に受信できなかった場合でも、２ＧＨｚ帯基地局２２からの信号を利用することができるので、測位のために必要な８００ＭＨｚ帯基地局からの伝搬遅延時間情報が十分な数（３つ）揃わないときでも２ＧＨｚ基地局からの伝搬遅延時間情報で補って測位に必要な情報を集めることができる。   As described above, according to the mobile terminal 1 of the present embodiment, even when the propagation delay time measurement unit 13 cannot sufficiently receive the signal from the 800 MHz band base station 21, the signal from the 2 GHz band base station 22 is received. Since a signal can be used, even when a sufficient number (three) of propagation delay time information from the 800 MHz band base station necessary for positioning is not available, the position is compensated with the propagation delay time information from the 2 GHz base station. You can gather the information you need.

更に、マルチパスフェージングの影響で８００ＭＨｚ帯の信号の受信電界強度が弱いときでも、マルチパスフェージングの影響を受けていない２ＧＨｚ帯の信号を利用することで補うことができる。   Furthermore, even when the reception field strength of a signal in the 800 MHz band is weak due to the effect of multipath fading, it can be compensated by using a signal in the 2 GHz band that is not affected by multipath fading.

また、本実施形態では、８００ＭＨｚ帯基地局２１からの信号をメインに利用することを想定していたので、８００ＭＨｚ帯基地局２１から十分な信号を受信できた場合（図３に示すステップＳＴ６）には２ＧＨｚ帯基地局２２からの信号を利用しなかったが、本発明はこれには限定されず、８００ＭＨｚ帯基地局２１から十分な信号を受信できている場合でも２ＧＨｚ帯基地局２２からの信号を利用し、周波数に関係なく受信強度が強い順に３つの基地局からの信号を利用するようにしてもよい。この場合、８００ＭＨｚ帯基地局２１からの信号のみを利用する場合に比べて、測位に使用できるパラメータの候補が多くなるため、測位精度の向上が期待できる。   In the present embodiment, since it is assumed that the signal from the 800 MHz band base station 21 is mainly used, a sufficient signal can be received from the 800 MHz band base station 21 (step ST6 shown in FIG. 3). However, the present invention is not limited to this, and even when a sufficient signal can be received from the 800 MHz band base station 21, the signal from the 2 GHz band base station 22 is not limited to this. Signals may be used, and signals from three base stations may be used in descending order of reception strength regardless of frequency. In this case, compared to the case where only the signal from the 800 MHz band base station 21 is used, the number of parameter candidates that can be used for positioning increases, and therefore, improvement in positioning accuracy can be expected.

本発明は上述した実施形態には限定されない。
すなわち、当業者は、本発明の技術的範囲またはその均等の範囲内において、上述した実施形態の構成要素に関し、様々な変更、コンビネーション、サブコンビネーション、並びに代替を行ってもよい。 The present invention is not limited to the embodiment described above.
That is, those skilled in the art may make various modifications, combinations, subcombinations, and alternatives regarding the components of the above-described embodiments within the technical scope of the present invention or an equivalent scope thereof.

本実施形態の携帯端末１では、８００ＭＨｚ帯の信号と２ＧＨｚ帯の信号を選別して利用しているが、本発明はこれには限定されない。例えば、８００ＭＨｚ・２ＧＨｚ以外の周波数帯の信号を利用してもよいし、また、２種類の信号だけでなく、３種類以上の周波数帯の信号を利用するようにしてもよい。   In the mobile terminal 1 of the present embodiment, the 800 MHz band signal and the 2 GHz band signal are selected and used, but the present invention is not limited to this. For example, signals in frequency bands other than 800 MHz and 2 GHz may be used, and not only two types of signals but also three or more types of frequency bands may be used.

また、本実施形態の携帯端末１では、８００ＭＨｚ帯の信号と、２ＧＨｚ帯の信号とを常時受信する構成としているが、８００ＭＨｚ帯の信号を常時受信して、必要な場合（例えば、図３のステップＳＴ１，ＳＴ２，ＳＴ４において否の判定となった場合）に２ＧＨｚ帯の信号を受信するように構成してもよい。   Further, the mobile terminal 1 of the present embodiment is configured to always receive an 800 MHz band signal and a 2 GHz band signal. However, when the mobile terminal 1 always receives an 800 MHz band signal and needs it (for example, FIG. 3). It may be configured to receive a 2 GHz band signal in the case of a negative determination in steps ST1, ST2 and ST4.

また、本実施形態では一例として携帯端末１について説明したが、本発明はこれには限定されない。すなわち、本発明の無線通信端末装置は、無線によってｇｐｓＯｎｅサーバと通信を行うことができ、複数の基地局からの信号の伝播遅延時間を測定できる全ての無線通信端末に適用可能である。   Moreover, although this embodiment demonstrated the portable terminal 1 as an example, this invention is not limited to this. That is, the wireless communication terminal device of the present invention can be applied to all wireless communication terminals that can communicate with the gpsOne server wirelessly and can measure propagation delay times of signals from a plurality of base stations.

図１は、本実施形態の通信システム１００について説明するための図である。FIG. 1 is a diagram for explaining a communication system 100 according to the present embodiment. 図２は、携帯端末１の構成の一例を示すブロック図である。FIG. 2 is a block diagram illustrating an example of the configuration of the mobile terminal 1. 図３は、伝搬遅延時間測定部１３が使用する周波数の判断を行う際のフローチャートである。FIG. 3 is a flowchart for determining the frequency used by the propagation delay time measurement unit 13. 図４は、携帯端末１の測位処理時の通信システム１００の動作例を説明するためのシーケンス図である。FIG. 4 is a sequence diagram for explaining an operation example of the communication system 100 during the positioning process of the mobile terminal 1.

符号の説明Explanation of symbols

１…携帯端末、１１…アンテナ、１２…送受信部、１３…伝搬遅延時間測定部、２…基地局、２１…８００ＭＨｚ帯基地局、２２…２ＧＨｚ帯基地局、３…サーバ、４…衛星、１００…通信システム、２００…通信網   DESCRIPTION OF SYMBOLS 1 ... Portable terminal, 11 ... Antenna, 12 ... Transmission / reception part, 13 ... Propagation delay time measurement part, 2 ... Base station, 21 ... 800MHz band base station, 22 ... 2GHz band base station, 3 ... Server, 4 ... Satellite, 100 ... Communication system 200 ... Communication network

Claims (9)

基地局から送信される周波数帯信号を受信する信号受信手段と、
前記信号受信手段にて受信された複数の前記基地局からの周波数帯信号の伝搬遅延時間を測定する伝搬遅延時間測定手段と、
を備えた無線通信端末装置において、
前記信号受信手段は、複数の周波数帯信号を受信可能に構成され、
前記伝搬遅延時間測定手段は、前記複数の周波数帯信号のうちの所定の周波数帯信号を送信する複数の前記基地局から送信されて前記信号受信手段にて受信される前記所定の周波数帯信号の前記伝搬遅延時間を測定するとともに、前記所定の周波数帯信号の受信状態が所定の条件を満足しない場合には、前記複数の周波数帯信号のうちの前記所定の周波数帯信号以外の周波数帯信号を送信する前記基地局から送信されて前記信号受信手段にて受信される当該周波数帯信号の前記伝搬遅延時間を測定する
ことを特徴とする無線通信端末装置。 Signal receiving means for receiving a frequency band signal transmitted from the base station;
Propagation delay time measuring means for measuring propagation delay times of frequency band signals from the plurality of base stations received by the signal receiving means;
In a wireless communication terminal device comprising:
The signal receiving means is configured to receive a plurality of frequency band signals,
The propagation delay time measuring means transmits the predetermined frequency band signal transmitted from the plurality of base stations that transmit a predetermined frequency band signal among the plurality of frequency band signals and received by the signal receiving means. When the propagation delay time is measured and the reception state of the predetermined frequency band signal does not satisfy a predetermined condition, a frequency band signal other than the predetermined frequency band signal is selected from the plurality of frequency band signals. The wireless communication terminal apparatus, wherein the propagation delay time of the frequency band signal transmitted from the transmitting base station and received by the signal receiving means is measured. 前記伝搬遅延時間測定手段は、前記所定の周波数帯信号を送信する複数の基地局からの前記所定周波数帯信号の前記信号受信手段での受信基地局数が所定値以上であるときに、前記所定の条件を満足すると判定する
ことを特徴とする請求項１に記載の無線通信端末装置。 The propagation delay time measuring unit is configured to receive the predetermined frequency band signal when the number of base stations received by the signal receiving unit of the predetermined frequency band signal from a plurality of base stations transmitting the predetermined frequency band signal is equal to or greater than a predetermined value. The wireless communication terminal device according to claim 1, wherein the wireless communication terminal device is determined to satisfy the following condition. 前記伝搬遅延時間測定手段は、前記信号受信手段での前記所定周波数帯信号の前記受信基地局数が前記所定値以上である場合に、前記信号受信手段にて受信される前記所定周波数帯信号のうち電界強度の変動が基準値未満である前記所定周波数帯信号の受信基地局数が前記所定値未満であるときに前記所定の条件を満足しないと判定する
ことを特徴とする請求項２に記載の無線通信端末装置。 The propagation delay time measuring unit is configured to transmit the predetermined frequency band signal received by the signal receiving unit when the number of base stations receiving the predetermined frequency band signal at the signal receiving unit is equal to or greater than the predetermined value. 3. It is determined that the predetermined condition is not satisfied when the number of base stations receiving the predetermined frequency band signal whose fluctuation in electric field intensity is less than a reference value is less than the predetermined value. Wireless communication terminal device. 前記伝搬遅延時間測定手段は、前記信号受信手段での前記所定周波数帯信号の前記受信基地局数が前記所定値以上である場合に、前記信号受信手段にて受信される前記所定周波数帯信号のうち受信強度が基準値以上である前記所定周波数帯信号の受信基地局数が前記所定値未満であるときに前記所定の条件を満足しないと判定する
ことを特徴とする請求項２に記載の無線通信端末装置。 The propagation delay time measuring unit is configured to transmit the predetermined frequency band signal received by the signal receiving unit when the number of base stations receiving the predetermined frequency band signal at the signal receiving unit is equal to or greater than the predetermined value. 3. The radio according to claim 2, wherein the predetermined condition is determined not to be satisfied when the number of reception base stations of the predetermined frequency band signal having a reception intensity equal to or higher than a reference value is less than the predetermined value. Communication terminal device. 前記伝搬遅延時間測定手段は、前記信号受信手段での前記所定周波数帯信号の前記受信基地局数が前記所定値以上である場合に、前記所定値の基地局から送信される前記所定周波数帯信号の前記伝搬遅延時間を測定し、前記信号受信手段での前記所定周波数帯信号の前記受信基地局数が前記所定値未満である場合には、前記信号受信手段にて受信される前記所定周波数帯信号と前記所定周波数帯信号以外の周波数帯信号を送信する前記基地局からの前記所定周波数帯信号以外の周波数帯信号とのうちの前記所定値の周波数帯信号の前記伝搬遅延時間を測定する
ことを特徴とする請求項２から４のいずれか一項に記載の無線通信端末装置。 The propagation delay time measuring means transmits the predetermined frequency band signal transmitted from the base station having the predetermined value when the number of receiving base stations of the predetermined frequency band signal in the signal receiving means is equal to or greater than the predetermined value. And measuring the propagation delay time of the predetermined frequency band received by the signal receiving means when the number of receiving base stations of the predetermined frequency band signal at the signal receiving means is less than the predetermined value. Measuring the propagation delay time of the predetermined frequency band signal of the signal and the frequency band signal other than the predetermined frequency band signal from the base station that transmits the frequency band signal other than the predetermined frequency band signal. The wireless communication terminal device according to claim 2, wherein the wireless communication terminal device is a wireless communication terminal device. 前記伝搬遅延時間測定手段は、前記信号受信手段で受信される前記所定の周波数帯信号の受信状態が前記所定の条件を満足しない場合、前記信号受信手段にて受信される前記所定の周波数帯信号と前記所定周波数帯信号以外の周波数帯信号を送信する前記基地局からの前記所定周波数帯信号以外の周波数帯信号とのうちの電界強度の変動が比較して小さい周波数帯信号を送信する基地局を前記所定値だけ選定し、この選定された基地局から送信されて前記信号受信手段にて受信された周波数帯信号の前記伝搬遅延時間を測定する
ことを特徴とする請求項２から５のいずれか一項に記載の無線通信端末装置。 The propagation delay time measuring means receives the predetermined frequency band signal received by the signal receiving means when the reception state of the predetermined frequency band signal received by the signal receiving means does not satisfy the predetermined condition. And a base station that transmits a frequency band signal having a smaller variation in electric field strength between the base station that transmits a frequency band signal other than the predetermined frequency band signal and a frequency band signal other than the predetermined frequency band signal transmitted from the base station. 6. The transmission delay time of the frequency band signal transmitted from the selected base station and received by the signal receiving means is measured by selecting only the predetermined value. The wireless communication terminal device according to claim 1. 前記伝搬遅延時間測定手段は、前記信号受信手段で受信される前記所定の周波数帯信号の受信状態が前記所定の条件を満足しない場合、前記信号受信手段にて受信される前記所定の周波数帯信号と前記所定周波数帯信号以外の周波数帯信号を送信する前記基地局からの前記所定周波数帯信号以外の周波数帯信号とのうちの受信強度が比較して大きい周波数帯信号を送信する基地局を前記所定値だけ選定し、この選定された基地局から送信されて前記信号受信手段にて受信された周波数帯信号の前記伝搬遅延時間を測定する
ことを特徴とする請求項２から５のいずれか一項に記載の無線通信端末装置。 The propagation delay time measuring means receives the predetermined frequency band signal received by the signal receiving means when the reception state of the predetermined frequency band signal received by the signal receiving means does not satisfy the predetermined condition. And a base station that transmits a frequency band signal having a higher received intensity than a frequency band signal other than the predetermined frequency band signal from the base station that transmits a frequency band signal other than the predetermined frequency band signal. 6. The propagation delay time of a frequency band signal transmitted from the selected base station and received by the signal receiving unit is measured by selecting only a predetermined value. 6. The wireless communication terminal device according to the item. 複数の周波数帯信号を送信する複数の基地局と、
前記複数の基地局からの周波数帯信号の伝搬遅延時間を測定する無線通信端末装置と、
前記伝搬遅延時間を基に、前記無線通信端末装置の現在位置を算出するサーバと
を備えた無線通信システムであって、
前記無線通信端末装置は、
前記複数の基地局から送信される周波数帯信号を受信する信号受信手段と、
前記信号受信手段にて受信された前記複数の基地局からの周波数帯信号の前記伝搬遅延時間を測定する伝搬遅延時間測定手段と、
を備え、
前記信号受信手段は、複数の周波数帯信号を受信可能に構成され、
前記伝搬遅延時間測定手段は、前記複数の周波数帯信号のうちの所定の周波数帯信号を送信する複数の前記基地局から送信されて前記信号受信手段にて受信される前記所定の周波数帯信号の前記伝搬遅延時間を測定するとともに、前記所定の周波数帯信号の受信状態が所定の条件を満足しない場合には、前記複数の周波数帯信号のうちの前記所定の信号以外の周波数帯信号を送信する前記基地局から送信されて前記信号受信手段にて受信される当該周波数帯信号の前記伝搬遅延時間を測定する
ことを特徴とする無線通信システム。 A plurality of base stations transmitting a plurality of frequency band signals;
A wireless communication terminal device for measuring propagation delay times of frequency band signals from the plurality of base stations;
A wireless communication system comprising: a server that calculates a current position of the wireless communication terminal device based on the propagation delay time;
The wireless communication terminal device
Signal receiving means for receiving frequency band signals transmitted from the plurality of base stations;
Propagation delay time measuring means for measuring the propagation delay times of the frequency band signals from the plurality of base stations received by the signal receiving means;
With
The signal receiving means is configured to receive a plurality of frequency band signals,
The propagation delay time measuring means transmits the predetermined frequency band signal transmitted from the plurality of base stations that transmit a predetermined frequency band signal among the plurality of frequency band signals and received by the signal receiving means. The propagation delay time is measured, and if the reception state of the predetermined frequency band signal does not satisfy a predetermined condition, a frequency band signal other than the predetermined signal is transmitted among the plurality of frequency band signals. A radio communication system, characterized by measuring the propagation delay time of the frequency band signal transmitted from the base station and received by the signal receiving means. 基地局から送信される所定の周波数帯信号を受信する第１の工程と、
前記所定の周波数帯信号の受信状態が所定の条件を満たすか否かを判断する第２の工程と、
前記第２の工程において、所定の条件を満たすと判断された場合には、前記所定の周波数帯信号を送信する複数の前記基地局から送信されて前記信号受信手段にて受信される前記所定の周波数帯信号の前記伝搬遅延時間を測定する第３の工程と、
前記第２の工程において、所定の条件を満たさないと判断された場合には、前記所定の周波数帯信号以外の周波数帯信号を送信する前記基地局から送信されて前記信号受信手段にて受信される当該周波数帯信号の前記伝搬遅延時間を測定する第４の工程と
を有することを特徴とする無線通信方法。 A first step of receiving a predetermined frequency band signal transmitted from the base station;
A second step of determining whether a reception state of the predetermined frequency band signal satisfies a predetermined condition;
In the second step, when it is determined that a predetermined condition is satisfied, the predetermined signal transmitted from the plurality of base stations transmitting the predetermined frequency band signal and received by the signal receiving means A third step of measuring the propagation delay time of a frequency band signal;
In the second step, when it is determined that the predetermined condition is not satisfied, the signal is received from the base station that transmits a frequency band signal other than the predetermined frequency band signal and is received by the signal receiving unit. And a fourth step of measuring the propagation delay time of the frequency band signal.
JP2005376707A 2005-12-27 2005-12-27 Radio communication terminal device, radio communication system, and radio communication method Pending JP2007180882A (en)

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