JP2010199991A

JP2010199991A - Location measuring system

Info

Publication number: JP2010199991A
Application number: JP2009042652A
Authority: JP
Inventors: Masahiko Uemura; 雅彦植村
Original assignee: NEC Corp
Current assignee: NEC Corp
Priority date: 2009-02-25
Filing date: 2009-02-25
Publication date: 2010-09-09

Abstract

PROBLEM TO BE SOLVED: To provide a technology to accurately measure the location of a portable telephone set based on a distance between the portable telephone set and a base station. SOLUTION: The location measuring system includes a portable telephone set and a plurality of base stations that communicates with the portable telephone set by radio communication. The portable telephone set includes: a timing control section that responses to a synchronizing channel supplied from a specific base station among the base stations and executes frame synchronization and slot synchronization with the specific base station; a PRACH signal generation section to transmit a PRACH signal to be supplied to the specific base station; a DPCH signal detection section to detect a DPCH signal supplied from the specific base station in response to the PRACH signal; and a location computation section that computes the location of the portable telephone set based on a time difference between the transmission timing of the PRACH signal and the detection timing of the DPCH signal and location information supplied from the specific base station. COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、位置測定システムに関し、特に、各基地局が同期していない移動通信において、携帯電話機の位置を推定する技術に関する。 The present invention relates to a position measurement system, and more particularly to a technique for estimating the position of a mobile phone in mobile communication in which each base station is not synchronized.

第三世代携帯電話（３Ｇ）システムの仕様の検討・作成をする標準化プロジェクトである３ＧＰＰ（Third Generation Partnership Project）や３ＧＰＰ２によって、新たな仕様が提唱されている。３ＧＰＰと３ＧＰＰ２とでは、通信方式以外にも、ファイルフォーマットなど多くの点で異なる仕様を含んでおり、互換性が確保されていないという事実がある。 New specifications have been proposed by 3GPP (Third Generation Partnership Project) and 3GPP2, which are standardization projects that examine and create specifications for third-generation mobile phone (3G) systems. 3GPP and 3GPP2 include different specifications in many respects such as file formats in addition to the communication method, and there is a fact that compatibility is not ensured.

３ＧＰＰ２の仕様に則った携帯電話システムでは、各基地局が同期している。そのために、各基地局から携帯電話機への信号の到達時間を比較して、携帯電話機の位置を推定することは容易である。しかしながら、３ＧＰＰの仕様に則ったシステムでは、各基地局が同期していない。そのために、各基地局からの信号の到達時間を正確に比較することが出来ず、信号の到達時間から携帯電話機の位置を推定する事が困難であった。 In the mobile phone system conforming to the specification of 3GPP2, each base station is synchronized. Therefore, it is easy to estimate the position of the mobile phone by comparing the arrival times of signals from each base station to the mobile phone. However, in a system that complies with the 3GPP specifications, the base stations are not synchronized. For this reason, it is difficult to accurately compare the arrival times of the signals from the respective base stations, and it is difficult to estimate the position of the mobile phone from the arrival times of the signals.

３ＧＰＰの仕様に則ったシステムで携帯電話機の位置を推定する技術として、無線信号の強度から、大まかな位置を推定する技術が知られている。また、携帯電話機にＧＰＳ機能を搭載することで、その位置を測定する技術が知られている。 As a technique for estimating the position of a mobile phone using a system conforming to 3GPP specifications, a technique for estimating a rough position from the strength of a radio signal is known. Also, a technique for measuring the position of a mobile phone by mounting a GPS function is known.

各基地局が同期していないシステムにおいて、基地局側から携帯電話機へ信号を送信し、携帯電話機がその信号のタイミングに従って応答を送信することで、基地局側で携帯電話機との時間差を測定し、携帯電話機の位置を推定する技術が知られている（例えば、特許文献１、２参照）。 In a system where each base station is not synchronized, the base station transmits a signal to the mobile phone, and the mobile phone transmits a response according to the timing of the signal, so that the base station measures the time difference from the mobile phone. A technique for estimating the position of a mobile phone is known (for example, see Patent Documents 1 and 2).

特開２００１−１７７４６９号公報JP 2001-177469 A 特開２００４−３５００８８号公報JP 2004-350088 A

携帯電話機にＧＰＳ機能を搭載することは、その携帯電話機の大型化・複雑化を必要とし、携帯電話機の電池保持時間の短縮や価格の上昇を招くことがある。また、特許文献１、２に記載の技術では、位置の推定を開始できるのは基地局であり、携帯電話機、またはそのユーザが、自発的に位置の推定を開始することが困難である。 Incorporating a GPS function in a mobile phone requires an increase in size and complexity of the mobile phone, which may lead to a reduction in battery holding time and an increase in price of the mobile phone. In the techniques described in Patent Documents 1 and 2, it is a base station that can start position estimation, and it is difficult for a mobile phone or its user to start position estimation spontaneously.

上記の課題を解決するために、携帯電話機と、携帯電話機と無線通信可能な複数の基地局とを具備する位置測定システムを構成する。ここにおいて、携帯電話機は、複数の基地局のうちの特定基地局から供給される同期チャネルに応答して、特定基地局とのフレーム同期とスロット同期とを実行するタイミング制御部と、特定基地局に供給するＰＲＡＣＨ（Physical Random Access Channel：物理ランダムアクセスチャネル）信号を送信するＰＲＡＣＨ信号発生部と、ＰＲＡＣＨ信号に応答して特定基地局から供給されるＤＰＣＨ（Dedicated Physical Channel：個別物理チャネル）信号を検出するＤＰＣＨ信号検出部と、ＰＲＡＣＨ信号の送信タイミングとＤＰＣＨ信号の検出タイミングとの時間差と、特定基地局から供給される位置情報とに基づいて、携帯電話機の位置を計算する位置計算部とを備えることが好ましい。 In order to solve the above problems, a position measurement system including a mobile phone and a plurality of base stations capable of wireless communication with the mobile phone is configured. Here, the mobile phone includes a timing control unit that performs frame synchronization and slot synchronization with a specific base station in response to a synchronization channel supplied from a specific base station among a plurality of base stations, and a specific base station A PRACH signal generation unit for transmitting a PRACH (Physical Random Access Channel) signal to be supplied to the network, and a DPCH (Dedicated Physical Channel) signal supplied from a specific base station in response to the PRACH signal A DPCH signal detection unit to detect, a position calculation unit to calculate the position of the mobile phone based on the time difference between the transmission timing of the PRACH signal and the detection timing of the DPCH signal, and the position information supplied from the specific base station It is preferable to provide.

本願において開示される発明のうち、代表的なものによって得られる効果を簡単に説明すれば、携帯電話機と基地局の間の距離を正確に測定することを可能にするという効果がある。 The effects obtained by typical ones of the inventions disclosed in the present application will be briefly described, and there is an effect that the distance between the mobile phone and the base station can be accurately measured.

また、この距離の測定を、複数の基地局に対して実施することで、複数の基地局との距離を得ることが出来る。 Moreover, the distance with several base stations can be obtained by measuring this distance with respect to several base stations.

さらに、基地局から携帯電話機へ信号を送信する際に、各基地局の位置情報を加えて送信することで、携帯電話機は、自ら携帯電話機の位置を推定することが可能である。 Furthermore, when transmitting a signal from the base station to the mobile phone, the mobile phone can estimate the position of the mobile phone by adding the location information of each base station and transmitting the signal.

具体的には、各基地局が相互に同期していない携帯電話システムにおいて、携帯電話機と各基地局の間の距離を測定し、携帯電話機の位置を推定する機能を提供している。そのため、携帯電話機にＧＰＳ機能などを追加することなく、携帯電話機の位置を特定することが可能であり、その位置情報に付随したサービスを提供できる。 Specifically, in a mobile phone system in which the base stations are not synchronized with each other, a function of measuring the distance between the mobile phone and each base station and estimating the position of the mobile phone is provided. Therefore, the position of the mobile phone can be specified without adding a GPS function or the like to the mobile phone, and a service associated with the position information can be provided.

図１は、本実施形態の位置測定システムの構成を例示するブロック図である。FIG. 1 is a block diagram illustrating the configuration of the position measurement system of this embodiment. 図２は、基地局と携帯電話機との構成を例示するブロック図である。FIG. 2 is a block diagram illustrating the configuration of the base station and the mobile phone. 図３は、本実施形態の位置測定システムの動作を例示するシーケンス図である。FIG. 3 is a sequence diagram illustrating the operation of the position measurement system according to this embodiment.

以下、本発明の実施の形態を図面に基づいて説明する。なお、実施の形態を説明するための図において、同一の部材には原則として同一の符号を付し、その繰り返しの説明は省略する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment, and the repetitive description thereof will be omitted.

図１は、本実施形態の位置測定システム１の構成を例示するブロック図である。本実施形態の位置測定システム１は、複数の基地局２と、その複数の基地局２と通信可能な携帯電話機３とを含んでいる。携帯電話機３は、その複数の基地局２の少なくとも１つと通信可能に構成され、好ましくは、３つ以上の基地局２と同時に通信可能に構成されている。 FIG. 1 is a block diagram illustrating the configuration of a position measurement system 1 according to this embodiment. The position measurement system 1 according to the present embodiment includes a plurality of base stations 2 and a mobile phone 3 that can communicate with the plurality of base stations 2. The mobile phone 3 is configured to be communicable with at least one of the plurality of base stations 2, and preferably configured to be communicable with three or more base stations 2 simultaneously.

図２は、基地局２と携帯電話機３との構成を例示するブロック図である。携帯電話機３は、タイミング制御部１１と、ＰＲＡＣＨ（Physical Random Access Channel：物理ランダムアクセスチャネル）信号発生部１２と、ＤＰＣＨ（Dedicated Physical Channel：個別物理チャネル）信号検出部１３と、位置計算部１４とを含んでいる。また、携帯電話機３は、後述する遅延時間ＤＴに関する情報を保持している。 FIG. 2 is a block diagram illustrating the configuration of the base station 2 and the mobile phone 3. The mobile phone 3 includes a timing controller 11, a PRACH (Physical Random Access Channel) signal generator 12, a DPCH (Dedicated Physical Channel) signal detector 13, and a position calculator 14. Is included. The mobile phone 3 holds information related to a delay time DT described later.

タイミング制御部１１は、複数の基地局２から送信される同期チャネルを受信して、その基地局２と携帯電話機３とのフレーム同期とスロット同期を取る機能ブロックである。タイミング制御部１１は、複数の基地局２の各々からの同期チャネル（ＳＣＨ）から、フレーム同期とスロット同期のタイミングを検出し、ＰＲＡＣＨ信号の発生・送信タイミングと、ＤＰＣＨ信号の受信タイミングを検出する。 The timing control unit 11 is a functional block that receives synchronization channels transmitted from a plurality of base stations 2 and performs frame synchronization and slot synchronization between the base stations 2 and the mobile phone 3. The timing control unit 11 detects the timing of frame synchronization and slot synchronization from the synchronization channel (SCH) from each of the plurality of base stations 2, and detects the generation / transmission timing of the PRACH signal and the reception timing of the DPCH signal. .

また、タイミング制御部１１は、後述するＰＲＡＣＨ信号発生部１２と後述するＤＰＣＨ信号検出部１３とからの信号の時間差を検出し、その時間差を後述する位置計算部１４へ通知する。また、タイミング制御部１１は、各基地局２から送信される、予め定められた位置情報２１を、位置計算部１４へ通知する。 Further, the timing control unit 11 detects a time difference between signals from a PRACH signal generation unit 12 described later and a DPCH signal detection unit 13 described later, and notifies the position calculation unit 14 described later of the time difference. In addition, the timing control unit 11 notifies the position calculation unit 14 of predetermined position information 21 transmitted from each base station 2.

ＰＲＡＣＨ信号発生部１２は、そのタイミング制御部１１から指示されるタイミングに従って、ＰＲＡＣＨチャネルを使って、特定のビットパターンを持つ上り信号を発生させる機能ブロックである。ＰＲＡＣＨ信号発生部１２は、ＰＲＡＣＨを用いた上りチャネルにおいて、タイミング制御部１１から指示されるタイミングで、ある特定のビットパターンの信号を発生させて、基地局２へ向けて送信する。 The PRACH signal generation unit 12 is a functional block that generates an uplink signal having a specific bit pattern using the PRACH channel according to the timing instructed by the timing control unit 11. The PRACH signal generation unit 12 generates a signal having a specific bit pattern at the timing indicated by the timing control unit 11 in the uplink channel using the PRACH, and transmits the signal to the base station 2.

ＤＰＣＨ信号検出部１３は、基地局２から送信されるＤＰＣＨチャネルを受信して、その中から、ある特定のビットパターンを検出し、その受信タイミングをタイミング制御部１１へ通知する機能ブロックである。位置計算部１４は、タイミング制御部１１から通知される、複数の基地局２の各々から受け取った信号の時間差と、複数の基地局２の各々の位置情報２１から、携帯電話機３が存在する位置を計算する機能ブロックである。 The DPCH signal detection unit 13 is a functional block that receives the DPCH channel transmitted from the base station 2, detects a specific bit pattern from the DPCH channel, and notifies the timing control unit 11 of the reception timing. The position calculation unit 14 determines the position where the mobile phone 3 exists from the time difference between the signals received from each of the plurality of base stations 2 and the position information 21 of each of the plurality of base stations 2 notified from the timing control unit 11. Is a functional block that calculates

複数の基地局２の各々は、記憶部１５と、ＰＲＡＣＨ上り信号検出部１６と、基地局タイミング制御部１７と、ＤＰＣＨ信号発生部１８とを含んでいる。 Each of the plurality of base stations 2 includes a storage unit 15, a PRACH uplink signal detection unit 16, a base station timing control unit 17, and a DPCH signal generation unit 18.

記憶部１５は、基地局２に備えられた情報記憶装置である。記憶部１５は、各基地局２の位置を示す位置情報２１を保持している。ＰＲＡＣＨ上り信号検出部１６は、携帯電話機３より送信されるＰＲＡＣＨチャネルを受信して、特定ビットパターンを検出する機能ブロックである。ＰＲＡＣＨ上り信号検出部１６は、その検出タイミングを、後述する基地局タイミング制御部１７へ通知する。 The storage unit 15 is an information storage device provided in the base station 2. The storage unit 15 holds position information 21 indicating the position of each base station 2. The PRACH uplink signal detection unit 16 is a functional block that receives the PRACH channel transmitted from the mobile phone 3 and detects a specific bit pattern. The PRACH uplink signal detection unit 16 notifies the detection timing to a base station timing control unit 17 described later.

基地局タイミング制御部１７は、ＰＲＡＣＨ上り信号検出部１６から通知されるＰＲＡＣＨ信号の受信タイミングと、事前に定められた待ち時間（遅延時間ＤＴ）から、後述するＤＰＣＨ信号発生部１８へ指示する特定ビットパターンの発生タイミングＤＰＣＨを用いた送信を指示する機能ブロックである。 The base station timing control unit 17 instructs the DPCH signal generation unit 18 described later from the reception timing of the PRACH signal notified from the PRACH uplink signal detection unit 16 and a predetermined waiting time (delay time DT). This is a functional block for instructing transmission using the bit pattern generation timing DPCH.

ＤＰＣＨ信号発生部１８は、基地局タイミング制御部１７から指示されるタイミングで、ある特定ビットパターンを、ＤＰＣＨチャネルを用いて携帯電話機３へ送信する機能ブロックである。また、このＤＰＣＨ信号発生部１８は、特定のビットパターンに加えて、その基地局２の設置位置を示す位置情報２１を送信する機能を有する。 The DPCH signal generation unit 18 is a functional block that transmits a specific bit pattern to the mobile phone 3 using the DPCH channel at a timing instructed by the base station timing control unit 17. The DPCH signal generator 18 has a function of transmitting position information 21 indicating the installation position of the base station 2 in addition to a specific bit pattern.

以下に、本実施形態の位置測定システム１の動作について説明を行う。図３は、本実施形態の位置測定システム１の動作を例示するシーケンス図である。 Below, operation | movement of the position measurement system 1 of this embodiment is demonstrated. FIG. 3 is a sequence diagram illustrating the operation of the position measurement system 1 of this embodiment.

ステップＳ１０１において、タイミング制御部１１は、ＰＲＡＣＨ信号発生部１２に、特定のビットパターンをＰＲＡＣＨ上り信号検出部１６へ送信するよう指示を出力する。ステップＳ１０２において、ＰＲＡＣＨ信号発生部１２は、その命令に応答して、時刻ｔ１のタイミングで、特定のビットパターンをＰＲＡＣＨ上り信号検出部１６へ送信する。 In step S 101, the timing control unit 11 outputs an instruction to the PRACH signal generation unit 12 to transmit a specific bit pattern to the PRACH uplink signal detection unit 16. In step S102, the PRACH signal generation unit 12 transmits a specific bit pattern to the PRACH uplink signal detection unit 16 at time t1 in response to the command.

ＰＲＡＣＨ上り信号検出部１６は、ＰＲＡＣＨ信号発生部１２から送信された特定のビットパターンを検出する。ステップＳ１０３において、ＰＲＡＣＨ上り信号検出部１６は、その検出タイミング（時刻ｔ２）を、基地局タイミング制御部１７へ通知する。 The PRACH uplink signal detection unit 16 detects a specific bit pattern transmitted from the PRACH signal generation unit 12. In step S103, the PRACH uplink signal detection unit 16 notifies the base station timing control unit 17 of the detection timing (time t2).

ステップＳ１０４において、基地局タイミング制御部１７は、ＤＰＣＨ信号発生部１８へ、特定のビットパターンの発生を支持する。このとき基地局タイミング制御部１７は、ＰＲＡＣＨ上り信号検出部１６から通知された検出タイミング（時刻ｔ２）から、予め定められた待ち時間（ＤＴ）を経過した後のタイミング（時刻ｔ３）で、ＤＰＣＨを用いて、基地局２へ送信するように指示を出す。 In step S104, the base station timing control unit 17 supports the DPCH signal generation unit 18 to generate a specific bit pattern. At this time, the base station timing control unit 17 performs DPCH at a timing (time t3) after a predetermined waiting time (DT) has elapsed from the detection timing (time t2) notified from the PRACH uplink signal detection unit 16. Is used to instruct the base station 2 to transmit.

ステップＳ１０５において、ＤＰＣＨ信号発生部１８は、基地局タイミング制御部１７から指示されたタイミング（時刻ｔ３）に、特定のビットパターンを発生させる。ＤＰＣＨ信号発生部１８は、さらに、その基地局２の設置位置を示す位置情報２１を特定のビットパターンに追加して、ＤＰＣＨを用いて携帯電話機３へ送信する。 In step S105, the DPCH signal generation unit 18 generates a specific bit pattern at the timing (time t3) instructed from the base station timing control unit 17. The DPCH signal generation unit 18 further adds position information 21 indicating the installation position of the base station 2 to a specific bit pattern, and transmits it to the mobile phone 3 using the DPCH.

携帯電話機３のＤＰＣＨ信号検出部１３は、ＤＰＣＨ信号発生部１８からＤＰＣＨを用いて送信された信号を受信し、その信号に含まれる特定のビットパターンを検出する。ステップＳ１０６において、ＤＰＣＨ信号検出部１３は、その検出タイミング（時刻ｔ４）を示す情報をタイミング制御部１１へ通知する。 The DPCH signal detector 13 of the mobile phone 3 receives the signal transmitted from the DPCH signal generator 18 using the DPCH, and detects a specific bit pattern included in the signal. In step S106, the DPCH signal detection unit 13 notifies the timing control unit 11 of information indicating the detection timing (time t4).

タイミング制御部１１は、ＤＰＣＨ信号検出部１３から通知されたタイミング（時刻ｔ４）と、時刻ｔ１の差から、信号の往復に要した時間
往復時間：ｔ４−ｔ１
を計算する。タイミング制御部１１は、その往復時間から、さらに、基地局２での待ち時間（遅延時間ＤＴ）を差し引くことで
実質往復時間：（ｔ４−ｔ１）−ＤＴ
を計算する。タイミング制御部１１は、その実質往復時間を、無線信号が往復するのに必要な時間とする。さらに、その半分｛（ｔ４−ｔ１）−ＤＴ｝／２を計算することで、携帯電話機と基地局の間を無線電波が伝播するに要する伝播時間を得る。 The timing control unit 11 determines the time required for the round trip of the signal based on the difference between the timing (time t4) notified from the DPCH signal detection unit 13 and the time t1, and the round trip time: t4-t1.
Calculate The timing control unit 11 further subtracts the waiting time (delay time DT) at the base station 2 from the round trip time, so that the real round trip time: (t4-t1) −DT
Calculate The timing control unit 11 sets the substantial round trip time as the time required for the radio signal to make a round trip. Further, by calculating the half {(t4-t1) -DT} / 2, a propagation time required for radio waves to propagate between the mobile phone and the base station is obtained.

ステップＳ１０７において、タイミング制御部１１は、算出した伝播時間に関する情報を位置計算部１４に供給する。さらに、ステップＳ１０８において、ＤＰＣＨ信号検出部１３は、基地局２の位置情報２１を位置計算部１４に供給する。 In step S 107, the timing control unit 11 supplies information regarding the calculated propagation time to the position calculation unit 14. Further, in step S108, the DPCH signal detection unit 13 supplies the position information 21 of the base station 2 to the position calculation unit 14.

位置計算部１４は、複数の基地局２の各々から受け取った信号の時間差をタイミング制御部１１から受け取り、各基地局２の位置情報２１をＤＰＣＨ信号検出部１３から受け取って、携帯電話機３が存在する位置を計算する。 The position calculation unit 14 receives the time difference between the signals received from each of the plurality of base stations 2 from the timing control unit 11, receives the position information 21 of each base station 2 from the DPCH signal detection unit 13, and the mobile phone 3 exists. Calculate the position to do.

上述のように、本実施形態の位置測定システム１では、携帯電話から基地局へ、基地局から送信されるＰ−ＳＣＨ（Primary Synchronization Channel）／Ｓ−ＳＣＨ（Secondary Synchronization Channel）信号によって規定されるフレームとスロットに同期したタイミングで信号を送信する。それを受信した基地局で、予め定められた時間後に、携帯電話に向けて信号を送信する。携帯電話機側では、携帯電話機と基地局間での信号の往復時間を、拡散信号のＣｈｉｐ単位で測定する。このようにして、位置測定システム１では、携帯電話機３から複数の基地局２へ信号を送信し、それを受信した基地局２から送信される信号を、携帯電話機３が受信するまでの時間から、各基地局２と携帯電話機３の間の距離を測定しているので、ＧＰＳ機能などに依存することなく携帯電話機３の位置を推定することができる。 As described above, in the position measurement system 1 of the present embodiment, it is defined by the P-SCH (Primary Synchronization Channel) / S-SCH (Secondary Synchronization Channel) signal transmitted from the base station to the base station. A signal is transmitted at a timing synchronized with the frame and the slot. The base station that has received the signal transmits a signal to the mobile phone after a predetermined time. On the mobile phone side, the round trip time of the signal between the mobile phone and the base station is measured in units of chip of the spread signal. Thus, in the position measurement system 1, a signal is transmitted from the mobile phone 3 to the plurality of base stations 2, and a signal transmitted from the base station 2 that receives the signal is received from the time until the mobile phone 3 receives the signal. Since the distance between each base station 2 and the mobile phone 3 is measured, the position of the mobile phone 3 can be estimated without depending on the GPS function or the like.

以上、本願発明の実施の形態を具体的に説明した。本願発明は上述の実施の形態に限定されるものではなく、その要旨を逸脱しない範囲で種々変更可能である。 The embodiment of the present invention has been specifically described above. The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

１…位置測定システム
２…基地局
３…携帯電話機
１１…タイミング制御部
１２…ＰＲＡＣＨ信号発生部
１３…ＤＰＣＨ信号検出部
１４…位置計算部
１５…記憶部
１６…ＰＲＡＣＨ上り信号検出部
１７…基地局タイミング制御部
１８…ＤＰＣＨ信号発生部
２１…位置情報
ＤＴ…遅延時間 DESCRIPTION OF SYMBOLS 1 ... Position measurement system 2 ... Base station 3 ... Mobile telephone 11 ... Timing control part 12 ... PRACH signal generation part 13 ... DPCH signal detection part 14 ... Position calculation part 15 ... Storage part 16 ... PRACH uplink signal detection part 17 ... Base station Timing control unit 18 ... DPCH signal generation unit 21 ... position information DT ... delay time

Claims

A mobile phone,
A plurality of base stations capable of wireless communication with the mobile phone;
The mobile phone is
A timing control unit that performs frame synchronization and slot synchronization with the specific base station in response to a synchronization channel supplied from the specific base station of the plurality of base stations;
A PRACH signal generator for transmitting a PRACH signal to be supplied to the specific base station;
A DPCH signal detector for detecting a DPCH signal supplied from the specific base station in response to the PRACH signal;
A position measurement system comprising: a position calculator that calculates a position of the mobile phone based on a time difference between a transmission timing of the PRACH signal and a detection timing of the DPCH signal and position information supplied from the specific base station .

The position measurement system according to claim 1,
The timing controller is
Outputting a transmission command indicating the timing of transmitting the PRACH signal;
The PRACH signal generator is
A position measurement system that transmits the PRACH signal to the specific base station at a timing according to a transmission command from the timing control unit.

The position measurement system according to claim 2,
The DPCH signal detector is
Extracting a first bit pattern signal from the DPCH signal, and notifying the timing control unit of reception timing information indicating a reception timing of the extracted first bit pattern signal;
The timing controller is
Based on the transmission command and the reception timing information, to calculate the time difference,
The position calculator is
A position measurement system that calculates the position of the mobile phone based on the time difference calculated by the timing control unit and the position information.

The position measurement system according to claim 3.
The PRACH signal generator is
A position measurement system that uses an PRACH channel to supply an uplink signal having a second bit pattern to the specific base station as the PRACH signal.

The position measurement system according to claim 4,
Each of the plurality of base stations is
A PRACH uplink signal detection unit that extracts the second bit pattern from an uplink signal having the second bit pattern supplied from the mobile phone;
A base station timing control unit for controlling the timing of the DPCH signal supplied to the mobile phone;
A DPCH signal generation unit that transmits a signal having the first bit pattern as the DPCH signal using a DPCH channel in response to a command from the specific base station timing control unit.

The position measurement system according to claim 5,
The PRACH uplink signal detection unit is
Notifying the specific base station timing control unit of extraction timing information indicating the timing of extracting the second bit pattern,
The specific base station timing controller is
A position measurement system that controls the timing of the DPCH signal based on the extraction timing information and a preset delay time.

A position measurement method executed by a position measurement system comprising a mobile phone and a plurality of base stations capable of wireless communication with the mobile phone,
(A) executing frame synchronization and slot synchronization with the specific base station in response to a synchronization channel supplied from the specific base station of the plurality of base stations;
(B) transmitting a PRACH signal to be supplied to the specific base station;
(C) detecting a DPCH signal supplied from the specific base station;
(D) calculating a position of the mobile phone based on a time difference between the transmission timing of the PRACH signal and the detection timing of the DPCH signal and position information supplied from the specific base station. Method.

The position measuring method according to claim 7,
The step (a) includes:
Outputting a transmission command indicating a timing of transmitting the PRACH signal;
The step (b)
A position measurement method comprising the step of transmitting the PRACH signal to the specific base station at a timing according to the transmission command.

The position measurement method according to claim 8,
The step (c) includes:
Extracting a first bit pattern signal from the DPCH signal;
A step of notifying reception timing information indicating a reception timing of the extracted signal of the first bit pattern; and the step (d),
A position measurement method, comprising: calculating a position of the mobile phone based on a time difference calculated based on the transmission command and the reception timing information and the position information.

The position measuring method according to claim 9, wherein
The step (b)
A position measurement method comprising the step of supplying an uplink signal having a second bit pattern to the specific base station as the PRACH signal using a PRACH channel.

The position measurement method according to claim 10, further comprising:
(E) extracting the second bit pattern from an upstream signal having the second bit pattern supplied from the mobile phone;
(F) controlling the timing of the DPCH signal supplied to the mobile phone;
(G) transmitting a signal having the first bit pattern as the DPCH signal using a DPCH channel in response to a predetermined transmission instruction.

The position measuring method according to claim 10,
The step (e) includes:
Notifying extraction timing information indicating the timing at which the second bit pattern is extracted,
The step (f)
A position measurement method comprising the step of controlling the timing of the DPCH signal based on the extraction timing information and a preset delay time.

A timing control unit that performs frame synchronization and slot synchronization with the specific base station in response to a synchronization channel supplied from the specific base station of the plurality of base stations;
A PRACH signal generator for transmitting a PRACH signal to be supplied to the specific base station;
A DPCH signal detector for detecting a DPCH signal supplied from the specific base station in response to the PRACH signal;
A position calculator that calculates the position of the mobile phone based on the time difference between the transmission timing of the PRACH signal and the detection timing of the DPCH signal and the position information supplied from the specific base station,
The timing controller is
Outputting a transmission command indicating the timing of transmitting the PRACH signal;
The PRACH signal generator is
Using a PRACH channel at a timing according to a transmission command from the timing control unit, an uplink signal having a first bit pattern is supplied to the specific base station as the PRACH signal,
The DPCH signal detector is
Extracting a first bit pattern signal from the DPCH signal, and notifying the timing control unit of reception timing information indicating a reception timing of the extracted first bit pattern signal;
The timing controller is
Based on the transmission command and the reception timing information, to calculate the time difference,
The position calculator is
A mobile phone that calculates the position of the mobile phone based on the time difference calculated by the timing control unit and the position information.

A position measurement program showing a procedure for measuring the position of a mobile phone,
(A) executing frame synchronization and slot synchronization with the specific base station in response to a synchronization channel supplied from a specific base station of the plurality of base stations;
(B) transmitting a PRACH signal to be supplied to the specific base station;
(C) detecting a DPCH signal supplied from the specific base station in response to the PRACH signal;
(D) calculating the position of the mobile phone based on the time difference between the transmission timing of the PRACH signal and the detection timing of the DPCH signal and the position information supplied from the specific base station,
The step (a) includes:
Outputting a transmission command indicating a timing of transmitting the PRACH signal;
The step (b)
Supplying an uplink signal having a first bit pattern to the specific base station as the PRACH signal using a PRACH channel at a timing according to a previous transmission command;
The step (c) includes:
Extracting a signal of a first bit pattern from the DPCH signal;
Notifying reception timing information indicating a reception timing of the extracted signal of the first bit pattern,
The step (d) includes:
A position measurement program, comprising: calculating a position of the mobile phone based on the time difference calculated based on the transmission command and the reception timing information and the position information.