JP2019124597A - Position estimation method of radio terminal station and radio base station - Google Patents

Position estimation method of radio terminal station and radio base station Download PDF

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JP2019124597A
JP2019124597A JP2018005797A JP2018005797A JP2019124597A JP 2019124597 A JP2019124597 A JP 2019124597A JP 2018005797 A JP2018005797 A JP 2018005797A JP 2018005797 A JP2018005797 A JP 2018005797A JP 2019124597 A JP2019124597 A JP 2019124597A
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terminal station
wireless terminal
radio wave
position estimation
base station
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JP6850739B2 (en
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友規 村上
Tomoki Murakami
友規 村上
誠 梅内
Makoto Umeuchi
誠 梅内
寛 坂本
Hiroshi Sakamoto
寛 坂本
智明 小川
Tomoaki Ogawa
智明 小川
真道 細田
Masamichi Hosoda
真道 細田
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Nippon Telegraph and Telephone Corp
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Abstract

To estimate the position of a radio terminal station at high speed by measuring a radio wave arrival time between a radio base station and the radio terminal station while the radio base station is switching distributed antennas deployed in a distributed manner.SOLUTION: A position estimation method of a radio terminal station is used when a radio base station estimates the position of the radio terminal station in a system including the radio base station capable of transmission and reception by switching a plurality of distributed antennas deployed in a distributed manner and the radio terminal station for communicating with the radio base station. The position estimation method includes: a first step of the radio base station measuring a radio wave arrival time with the radio terminal station for each of the distributed antennas; and a second step of estimating the position of the radio terminal station by using the radio wave arrival time for each of the plurality of distributed antennas measured in the first step.SELECTED DRAWING: Figure 1

Description

本発明は、分散配置される分散アンテナの切り替えが可能な無線基地局において、分散アンテナごとに当該無線基地局と無線端末局との間の電波到達時間を測定することで無線端末局の位置を推定する無線端末局の位置推定方法および無線基地局に関する。   According to the present invention, in a wireless base station capable of switching distributed antennas disposed in a distributed manner, the position of the wireless terminal station is measured by measuring the radio wave arrival time between the wireless base station and the wireless terminal station for each distributed antenna. The present invention relates to a wireless terminal station position estimation method and wireless base station to be estimated.

無線信号の電波到達時間であるＴｏＡ（Time of Arrival ）を応用したサービスとして、無線ＬＡＮシステムにおける無線端末局の位置提供サービスがある。この位置提供サービスの実現例として、例えば非特許文献１に示すように、位置推定を行いたい無線端末局と複数の無線基地局との間で電波到達時間を測定する方法がある。   As a service to which ToA (Time of Arrival) which is a radio wave arrival time of a wireless signal is applied, there is a position providing service of a wireless terminal station in a wireless LAN system. For example, as shown in Non-Patent Document 1, there is a method of measuring radio wave arrival time between a wireless terminal station whose position is to be estimated and a plurality of wireless base stations as an example of implementation of the position providing service.

図４は、従来の無線端末局の位置推定方法を示す。
図４において、無線端末局４０の周辺に複数の無線基地局５０−１〜５０−３が存在する。無線端末局４０は、まず無線基地局５０−１との接続処理を行い（Ｓ11）、無線基地局５０−１に測定信号を送信し、無線基地局５０−１から応答信号を受信する（Ｓ12）。この無線端末局４０の測定信号の送信開始時刻と、無線基地局５０−１からの応答信号の受信開始時刻から往復遅延時間Ｔm1を測定する。無線端末局４０は、同様に他の無線基地局５０−２，５０−３との接続処理を行い、それぞれ測定信号の送信開始時刻と応答信号の受信開始時刻から往復遅延時間Ｔm2，Ｔm3を算出する（Ｓ13〜Ｓ16）。さらに、無線端末局４０は、各無線基地局５０−１〜５０−３との間の往復遅延時間Ｔm1〜Ｔm3から、それぞれの電波到達時間Ｔ1 〜Ｔ3 を算出する。そして、複数の無線基地局５０−１〜５０−３の位置情報と各電波到達時間Ｔ1 〜Ｔ3 から、無線端末局４０の位置を推定する（Ｓ17）。 FIG. 4 shows a conventional wireless terminal station position estimation method.
In FIG. 4, a plurality of wireless base stations 50-1 to 50-3 exist around the wireless terminal station 40. The radio terminal station 40 first performs connection processing with the radio base station 50-1 (S11), transmits a measurement signal to the radio base station 50-1, and receives a response signal from the radio base station 50-1 (S12). ). The round trip delay time Tm1 is measured from the transmission start time of the measurement signal of the wireless terminal station 40 and the reception start time of the response signal from the wireless base station 50-1. Similarly, the wireless terminal station 40 performs connection processing with other wireless base stations 50-2 and 50-3, and calculates round trip delay times Tm2 and Tm3 from the transmission start time of the measurement signal and the reception start time of the response signal, respectively. (S13 to S16). Furthermore, the wireless terminal station 40 calculates the radio wave arrival times T1 to T3 from the round trip delay times Tm1 to Tm3 with the respective wireless base stations 50-1 to 50-3. Then, the position of the radio terminal station 40 is estimated from the position information of the plurality of radio base stations 50-1 to 50-3 and the radio wave arrival times T1 to T3 (S17).

M. Llombart, M. Ciurana, and F. Barcelo-Arroyo. "On the scalability of a novel WLAN positioning system based on time of arrival measurements." Proc. IEEE WPNC, 2008.M. Llombart, M. Ciurana, and F. Barcelo-Arroyo. "On the scalability of a novel WLAN positioning system based on time of arrival measurements." Proc. IEEE WPNC, 2008.

図４に示す従来の無線端末局の位置推定方法では、位置推定を行いたい無線端末局４０と複数の無線基地局５０−１〜５０−３との間の電波到達時間Ｔ1 〜Ｔ3 を算出するために、無線端末局４０は、複数の無線基地局５０−１〜５０−３に順番に接続する必要があり、その接続処理に無線基地局数分の時間がかかっていた。   In the conventional wireless terminal station position estimation method shown in FIG. 4, the radio wave arrival times T1 to T3 between the wireless terminal station 40 whose position is to be estimated and the plurality of wireless base stations 50-1 to 50-3 are calculated. Therefore, the wireless terminal station 40 needs to connect to the plurality of wireless base stations 50-1 to 50-3 in order, and it takes time for the connection process to be equal to the number of wireless base stations.

本発明は、無線基地局で分散配置される分散アンテナを切り替えながら無線基地局と無線端末局との間の電波到達時間を測定することで、高速に無線端末局の位置推定を行うことができる無線端末局の位置推定方法および無線基地局を提供することを目的とする。   The present invention can perform position estimation of a wireless terminal station at high speed by measuring the radio wave arrival time between the wireless base station and the wireless terminal station while switching the distributed antennas distributed in the wireless base station. An object of the present invention is to provide a wireless terminal station position estimation method and a wireless base station.

第１の発明は、分散配置される複数の分散アンテナを切り替えて送受信が可能な無線基地局と、該無線基地局と通信する無線端末局とを備え、該無線基地局が該無線端末局の位置を推定する無線端末局の位置推定方法において、無線基地局が複数の分散アンテナごとに無線端末局との間の電波到達時間を測定する第１ステップと、第１ステップで測定した複数の分散アンテナごとの電波到達時間を用いて無線端末局の位置を推定する第２ステップとを有する。   A first invention comprises a wireless base station capable of transmitting and receiving by switching a plurality of distributed antennas disposed in a distributed manner, and a wireless terminal station communicating with the wireless base station, the wireless base station comprising In a position estimation method of a wireless terminal station for estimating a position, the wireless base station measures a radio wave arrival time with the wireless terminal station for each of a plurality of distributed antennas, and a plurality of dispersions measured in the first step. And a second step of estimating the position of the wireless terminal station using the radio wave arrival time for each antenna.

第１の発明の無線端末局の位置推定方法において、第１ステップは、分散アンテナごとに接続されるケーブルの長さによる遅延時間を校正する機能を有する。   In the position estimation method of the wireless terminal station according to the first invention, the first step has a function of calibrating the delay time due to the length of the cable connected for each distributed antenna.

第１の発明の無線端末局の位置推定方法において、第１ステップは、無線端末局の内部における時間ずれを校正する機能を有する。   In the position estimation method of a wireless terminal station according to the first invention, the first step has a function of calibrating a time lag inside the wireless terminal station.

第１の発明の無線端末局の位置推定方法において、第１ステップは、他無線局からの干渉による電波到達時間ずれを校正する機能を有する。   In the position estimation method of a wireless terminal station according to the first invention, the first step has a function of calibrating a radio wave arrival time deviation due to interference from another wireless station.

第１の発明の無線端末局の位置推定方法において、第１ステップは、無線基地局が送信する電波到達時間を測定するための測定信号の送信電力、または変調方式・符号化率、または周波数・伝送帯域を変更することで、電波反射による電波到達時間ずれを低減する機能を有する。   In the position estimation method of a wireless terminal station according to the first invention, the first step is a transmission power of a measurement signal for measuring a radio wave arrival time transmitted by the wireless base station, or a modulation method / coding rate, or a frequency. By changing the transmission band, it has a function to reduce the radio wave arrival time deviation due to radio wave reflection.

第２の発明の無線基地局は、所定の長さを有するケーブルを介して分散配置される複数の分散アンテナと、無線端末局との電波到達時間を測定するための測定信号を送信する測定信号送信部と、測定信号を受信した無線端末局から送信された応答信号を受信する応答信号受信部と、複数の分散アンテナを切り替え、該切り替えた分散アンテナと測定信号送信部および応答信号受信部とを接続するアンテナ切替部と、分散アンテナごとに、測定信号の送信から応答信号の受信までの往復遅延時間を測定する往復遅延時間測定部と、分散アンテナごとに、往復遅延時間から電波到達時間を算出する電波到達時間算出部と、分散アンテナごとの電波到達時間から無線端末局の位置を推定する位置推定部とを備える。   A wireless base station according to a second aspect of the present invention is a measurement signal for transmitting a measurement signal for measuring a radio arrival time with a plurality of distributed antennas distributed via a cable having a predetermined length and a wireless terminal station. A transmitter, a response signal receiver that receives a response signal transmitted from a wireless terminal station that has received a measurement signal, a plurality of distributed antennas are switched, and the switched distributed antenna, measurement signal transmitter, and response signal receiver are selected. For each distributed antenna, a reciprocation delay time measurement unit for measuring the round trip delay time from transmission of the measurement signal to reception of the response signal, and for each distributed antenna, the radio wave arrival time to the radio wave arrival time A radio wave arrival time calculation unit to be calculated, and a position estimation unit that estimates the position of the wireless terminal station from the radio wave arrival time for each distributed antenna.

第２の発明の無線端末局において、分散アンテナごとに、測定信号の送信電力、または変調方式・符号化率、または周波数・伝送帯域を変更し、電波反射による電波到達時間ずれを低減する手段を備える。   In the wireless terminal station according to the second aspect of the invention, there is provided means for changing the transmission power of the measurement signal, or the modulation scheme / coding rate, or the frequency / transmission band for each distributed antenna to reduce the radio arrival time deviation due to radio reflection. Prepare.

本発明は、分散配置される複数の分散アンテナを切り替えながら、無線基地局と無線端末局との間で送受信する測定信号および応答信号から電波到達時間を測定することにより、高速に無線端末局の位置推定することができる。   The present invention can measure a radio wave arrival time from a measurement signal and a response signal transmitted / received between a radio base station and a radio terminal station while switching a plurality of distributed antennas distributed and arranged at high speed. The position can be estimated.

本発明における無線端末局の位置推定方法を説明する図である。It is a figure explaining the position estimation method of the radio | wireless terminal station in this invention. 本発明における無線基地局１０および無線端末局２０の構成例を示す図である。It is a figure which shows the structural example of the wireless base station 10 and the wireless terminal station 20 in this invention. 測定信号および応答信号の伝搬路を説明する図である。It is a figure explaining the propagation path of a measurement signal and a response signal. 従来の無線端末局の位置推定方法を説明する図である。It is a figure explaining the position estimation method of the conventional radio | wireless terminal station.

図１は、本発明における無線端末局の位置推定方法を示す。
図１において、無線基地局１０には、分散配置される分散アンテナ１１−１〜１１−３が接続される。ここでは、分散アンテナが３本の例を示すが、３本以上であってもよい。無線基地局１０と各分散アンテナ１１−１〜１１−３は、所定の長さを有するケーブル１２−１〜１２−３を介して接続され、各分散アンテナ１１−１〜１１−３の位置を（ｘ1 ，ｙ1 ）、（ｘ2 ，ｙ2 ）、（ｘ3 ，ｙ3 ）とする。 FIG. 1 shows a position estimation method of a wireless terminal station in the present invention.
In FIG. 1, distributed antennas 11-1 to 11-3 distributed and arranged are connected to the radio base station 10. Here, although the example of three distributed antennas is shown, three or more distributed antennas may be used. The wireless base station 10 and each of the distributed antennas 11-1 to 11-3 are connected via cables 12-1 to 12-3 having a predetermined length, and the positions of the distributed antennas 11-1 to 11-3 are Let (x 1 , y 1 ), (x 2 , y 2 ), and (x 3 , y 3 ).

無線基地局１０は、分散アンテナ１１−１〜１１−３を介して無線端末局２０との接続処理を行い、無線端末局２０の位置情報の収集を開始する（Ｓ１）。   The wireless base station 10 performs connection processing with the wireless terminal station 20 via the distributed antennas 11-1 to 11-3, and starts collecting location information of the wireless terminal station 20 (S1).

無線基地局１０は、まず分散アンテナ１１−１に切り替え、無線端末局２０に対して測定信号を送信し、測定信号を受信した無線端末局２０は、無線基地局１０に対して応答信号を送信する（Ｓ２）。ここで、無線基地局１０は、測定信号の送信開始時刻と応答信号の受信開始時刻を測定し、往復遅延時間Ｔm1を取得する。この往復遅延時間Ｔm1には、接続されるケーブル１２−１の往復で発生する遅延時間２Ｔc1および測定信号の信号長Ｔs が含まれているので、無線基地局１０の分散アンテナ１１−１と無線端末局２０との間の電波到達時間Ｔ1 は、次式で求めることができる。
Ｔ1 ＝（Ｔm1−２Ｔc1−Ｔs ）／２ …(1) The wireless base station 10 first switches to the distributed antenna 11-1, transmits a measurement signal to the wireless terminal station 20, and receives a measurement signal. The wireless terminal station 20 transmits a response signal to the wireless base station 10. To do (S2). Here, the radio base station 10 measures the transmission start time of the measurement signal and the reception start time of the response signal, and acquires the round trip delay time Tm1. Since the round trip delay time Tm1 includes the delay time 2Tc1 generated in the round trip of the cable 12-1 to be connected and the signal length Ts of the measurement signal, the distributed antenna 11-1 of the wireless base station 10 and the wireless terminal The radio wave arrival time T1 with the station 20 can be obtained by the following equation.
T1 = (Tm1-2Tc1-Ts) / 2 (1)

次に、無線基地局１０は、分散アンテナ１１−２，１１−３に順次切り替え、無線端末局２０に対して測定信号を送信し、測定信号を受信した無線端末局２０は無線基地局１０に対して応答信号を送信し（Ｓ３，Ｓ４）、往復遅延時間Ｔm2，Ｔm3を測定する。ここで、分散アンテナ１１−２，１１−３と無線端末局２０との間の電波到達時間Ｔ2 ，Ｔ3 は、ケーブル１２−２，１２−３の往復で発生する遅延時間２Ｔc2，２Ｔc3と、測定信号の信号長Ｔs を用いて、次式で求めることができる。
Ｔ2 ＝（Ｔm2−２Ｔc2−Ｔs ）／２ …(2)
Ｔ3 ＝（Ｔm3−２Ｔc3−Ｔs ）／２ …(3) Next, the wireless base station 10 sequentially switches to the distributed antennas 11-2 and 11-3, transmits a measurement signal to the wireless terminal station 20, and the wireless terminal station 20 that has received the measurement signal transmits to the wireless base station 10. Then, the response signal is transmitted (S3, S4), and the round trip delay times Tm2, Tm3 are measured. Here, the radio wave arrival times T2 and T3 between the distributed antennas 11-2 and 11-3 and the wireless terminal station 20 are measured with the delay times 2Tc2 and 2Tc3 generated in the round trips of the cables 12-2 and 12-3, respectively. The signal length Ts of the signal can be obtained by the following equation.
T2 = (Tm2-2Tc2-Ts) / 2 (2)
T3 = (Tm3-2Tc3-Ts) / 2 (3)

次に、無線基地局１０は、得られた各分散アンテナ１１−１〜１１−３に対する電波到達時間Ｔ1 〜Ｔ3 から、無線基地局１０と各分散アンテナ１１−１〜１１−３との間の距離Ｒ1 〜Ｒ3 に換算し、無線端末局２０の位置（ｘ，ｙ）を次式を用いて推定する（Ｓ５）。
Ｒ1 ＝｛ (ｘ−ｘ1)2 ＋ (ｙ−ｙ1)2 ｝1/2 ＋ｃΔｔ …(4-1)
Ｒ2 ＝｛ (ｘ−ｘ2)2 ＋ (ｙ−ｙ2)2 ｝1/2 ＋ｃΔｔ …(4-2)
Ｒ3 ＝｛ (ｘ−ｘ3)2 ＋ (ｙ−ｙ3)2 ｝1/2 ＋ｃΔｔ …(4-3) Next, in the radio base station 10, between the radio base station 10 and each of the distributed antennas 11-1 to 11-3, the radio wave arrival times T1 to T3 for each of the distributed antennas 11-1 to 11-3 are obtained. The distance R1 to R3 are converted, and the position (x, y) of the wireless terminal station 20 is estimated using the following equation (S5).
R1 = {(x−x 1 ) 2 + (y−y 1 ) 2 } 1/2 + cΔt (4-1)
R2 = {(x−x 2 ) 2 + (y−y 2 ) 2 } 1/2 + cΔt (4-2)
R3 = {(x-x 3 ) 2 + (y-y 3 ) 2 } 1/2 + c Δt (4-3)

ここで、ｃは光速、Δｔは無線端末局２０内で測定信号を受信して応答信号を送信するまでの遅延時間である。なお、当該遅延時間Δｔは、式(1) 〜式(3) の電波到達時間Ｔ1 〜Ｔ3 で調整してもよい。式(4-1) 〜式(4-3) から無線端末局２０の位置（ｘ，ｙ）を算出する方法は様々あるが、例えばニュートン法を用いることで、（ｘ，ｙ）を算出することができる。この例では、２次元上での位置を想定しているが、分散アンテナ数を増加させることで、３次元上においても無線端末局２０の位置を推定することができる。   Here, c is the speed of light, and Δt is the delay time until the wireless terminal station 20 receives a measurement signal and transmits a response signal. The delay time .DELTA.t may be adjusted by the radio wave arrival times T1 to T3 of the equations (1) to (3). There are various methods for calculating the position (x, y) of the wireless terminal station 20 from the equations (4-1) to (4-3). For example, the (x, y) is calculated by using the Newton method. be able to. In this example, the position in two dimensions is assumed, but the position of the wireless terminal station 20 can be estimated also in three dimensions by increasing the number of distributed antennas.

図２は、本発明における無線基地局１０および無線端末局２０の構成例を示す。なお、図中には、本発明に関係する主要な機能ブロックのみを抽出して示しており、一般的に無線基地局および無線端末局でも用いられる機能ブロックおよびその説明は省略している。   FIG. 2 shows a configuration example of the wireless base station 10 and the wireless terminal station 20 in the present invention. In the drawing, only the main functional blocks related to the present invention are extracted and shown, and the functional blocks generally used also in the wireless base station and the wireless terminal station and the description thereof are omitted.

図２において、無線基地局１０は、分散アンテナ１１−１〜１１−ｎ（ｎは３以上の整数）、ケーブル１２−１〜１２−ｎ、アンテナ切替部１３、測定信号送信部１４、応答信号受信部１５、往復遅延時間測定部１６、電波到達時間算出部１７、位置推定部１８から構成される。   In FIG. 2, the radio base station 10 includes distributed antennas 11-1 to 11-n (n is an integer of 3 or more), cables 12-1 to 12-n, an antenna switching unit 13, a measurement signal transmission unit 14, and a response signal. The reception unit 15, the round trip delay time measurement unit 16, the radio wave arrival time calculation unit 17, and the position estimation unit 18.

分散アンテナ１１−１〜１１−ｎは、アンテナ切替部１３からケーブル１２−１〜１２−ｎを介して入力する測定信号を空中に送信し、空中から受信した応答信号をケーブル１２−１〜１２−ｎを介しアンテナ切替部１３に出力する。   Distributed antennas 11-1 to 11-n transmit measurement signals input from antenna switching unit 13 via cables 12-1 to 12-n to the air, and response signals received from the air are transmitted to cables 12-1 to 12 Output to the antenna switching unit 13 via −n.

アンテナ切替部１３は、測定信号送信部１４から測定信号が入力される場合に、指定された分散アンテナ１１−１〜１１−ｎの１つに切り替えて出力する。また、指定された分散アンテナで受信する応答信号を応答信号受信部１５に出力する。   When a measurement signal is input from the measurement signal transmission unit 14, the antenna switching unit 13 switches to one of the designated distributed antennas 11-1 to 11-n and outputs the signal. Further, it outputs a response signal received by the designated distributed antenna to the response signal receiving unit 15.

測定信号送信部１４は、無線基地局１０および無線端末局２０の間の往復遅延時間を測定するための測定信号を生成し、アンテナ切替部１３に出力する。また、測定信号の送信開始時刻を往復遅延時間測定部１６に出力する。   The measurement signal transmission unit 14 generates a measurement signal for measuring the round trip delay time between the wireless base station 10 and the wireless terminal station 20, and outputs the measurement signal to the antenna switching unit 13. Further, the transmission start time of the measurement signal is output to the round trip delay time measurement unit 16.

応答信号受信部１５は、分散アンテナから送信された測定信号を無線端末局２０が受信し、測定信号に対する応答信号が送信された場合に、その応答信号を受信し、その受信開始時刻を往復遅延時間測定部１６に出力する。   When the wireless terminal station 20 receives the measurement signal transmitted from the distributed antenna and the response signal to the measurement signal is transmitted, the response signal reception unit 15 receives the response signal, and the reception start time is delayed by the round trip delay It is output to the time measurement unit 16.

往復遅延時間測定部１６は、測定信号送信部１４から入力する送信開始時刻と、応答信号受信部１５から入力される受信開始時刻の差分を算出し、往復遅延時間Ｔm1〜Ｔmnとして電波到達時間算出部１７に出力する。   The round trip delay time measurement unit 16 calculates the difference between the transmission start time input from the measurement signal transmission unit 14 and the reception start time input from the response signal reception unit 15, and calculates the radio wave arrival time as the round trip delay times Tm1 to Tmn. Output to the unit 17.

電波到達時間算出部１７は、往復遅延時間測定部１６から入力する往復遅延時間Ｔm1〜Ｔmnから、例えば式(1) 〜式(3) で示される各種の時間ずれを校正し、分散アンテナ１１−１〜１１−ｎと無線端末局２０との間の電波到達時間Ｔ1 〜Ｔn を位置推定部１８に出力する。   The radio wave arrival time calculation unit 17 calibrates various time deviations represented by, for example, the equations (1) to (3) from the round trip delay times Tm1 to Tmn input from the round trip delay time measurement unit 16, and the distributed antenna 11- The radio wave arrival times T1 to Tn between 1 to 11-n and the radio terminal station 20 are output to the position estimation unit 18.

位置推定部１８では、電波到達時間算出部１７から入力される分散アンテナごとの電波到達時間Ｔ1 〜Ｔn から、例えば式(4-1) 〜式(4-3) を用いて無線端末局２０の位置を推定する。   The position estimation unit 18 uses the radio wave arrival times T1 to Tn for each of the distributed antennas input from the radio wave arrival time calculation unit 17 to, for example, use the equations (4-1) to (4-3) Estimate the position.

無線端末局２０は、アンテナ２１、測定信号受信部２２、応答信号送信部２３から構成される。
アンテナ２１は、受信した測定信号を測定信号受信部２２に出力し、応答信号送信部２３から入力される応答信号を空中に送信する。 The wireless terminal station 20 includes an antenna 21, a measurement signal receiving unit 22, and a response signal transmitting unit 23.
The antenna 21 outputs the received measurement signal to the measurement signal reception unit 22 and transmits the response signal input from the response signal transmission unit 23 to the air.

測定信号受信部２２は、アンテナ２１から入力される測定信号を受信し、その情報を応答信号送信部２３に出力する。
応答信号送信部２３では、測定信号受信部２２から入力する測定信号に対する無線基地局１０への応答信号を生成し、アンテナ２１に出力する。 The measurement signal receiver 22 receives the measurement signal input from the antenna 21, and outputs the information to the response signal transmitter 23.
The response signal transmission unit 23 generates a response signal to the radio base station 10 in response to the measurement signal input from the measurement signal reception unit 22, and outputs the response signal to the antenna 21.

ところで、式(1) 〜式(3) で示した分散アンテナ１１−１〜１１−３ごとに算出される電波到達時間Ｔ1 〜Ｔ3 には、他無線局からの干渉信号によるずれも存在する可能性がある。例えば、無線端末局２０が応答信号を送信する際に、他無線局からの干渉によって送信待機が発生し、送信が遅れる場合がある。このように干渉信号によって正常に応答信号の送受信ができない場合があるため、電波到達時間に異常値が検出された場合は、その値を削除することによって、干渉による影響を削除する。   By the way, in the radio wave arrival times T1 to T3 calculated for each of the distributed antennas 11-1 to 11-3 represented by the equations (1) to (3), there may be a deviation due to interference signals from other radio stations. There is sex. For example, when the wireless terminal station 20 transmits a response signal, transmission standby may occur due to interference from other wireless stations, and the transmission may be delayed. As described above, since there is a case where the response signal can not be normally transmitted and received due to the interference signal, when an abnormal value is detected in the radio wave arrival time, the influence of the interference is eliminated by deleting the value.

また、電波到達時間Ｔ1 〜Ｔ3 を高精度に算出するために、分散アンテナ１１−１〜１１−３ごとに測定信号の送信形式を変更する方法が有効である。その具体例を図３を参照して説明する。   Also, in order to calculate the radio wave arrival times T1 to T3 with high accuracy, it is effective to change the transmission format of the measurement signal for each of the distributed antennas 11-1 to 11-3. A specific example thereof will be described with reference to FIG.

図３は、無線基地局１０に接続される１つの分散アンテナ１１のみを示し、送信形式を変更せず、分散アンテナ１１と無線端末局２０との間の往復遅延時間を測定する例を示す。ただし、本環境における伝搬路は、直接成分、反射物３０−１による第１反射成分、反射物３０−２による第２反射成分、反射物３０−３による第３反射成分の４種類となり、往復遅延時間は４種類の合成波から算出される。なお、往復遅延時間は反射成分が存在するほど測定誤差が増加する傾向にある。   FIG. 3 shows only one distributed antenna 11 connected to the wireless base station 10, and shows an example of measuring the round trip delay time between the distributed antenna 11 and the wireless terminal station 20 without changing the transmission format. However, the propagation path in the present environment includes four types of direct components, the first reflection component by the reflector 30-1, the second reflection component by the reflector 30-2, and the third reflection component by the reflector 30-3. The delay time is calculated from four types of composite waves. The round trip time tends to increase the measurement error as the reflection component is present.

ここで、無線基地局１０から送信する測定信号の送信電力を低減した場合には、例えば無線基地局１０から遠い反射物３０−２で測定信号の反射波が小さくなり、この反射成分を削減できる。   Here, when the transmission power of the measurement signal transmitted from the wireless base station 10 is reduced, for example, the reflected wave of the measurement signal becomes smaller at the reflector 30-2 far from the wireless base station 10, and this reflection component can be reduced. .

また、無線基地局１０から送信する測定信号の変調方式および符号化率を変更することにより、無線端末局２０における必要な受信感度を変更することができ、３種類の反射成分の一部または全部の受信可否を選択できる。   Further, by changing the modulation scheme and the coding rate of the measurement signal transmitted from the wireless base station 10, the necessary reception sensitivity in the wireless terminal station 20 can be changed, and some or all of the three types of reflection components can be changed. You can select whether to receive or not.

また、無線基地局１０から送信する測定信号の伝送帯域もしくは伝送周波数を調整する方法がある。一般的に、伝送周波数や伝送帯域によって伝搬路が異なることが知られている。したがって、複数の周波数や伝送帯域によって異なる伝搬路の往復遅延時間を測定することができる。   Also, there is a method of adjusting the transmission band or transmission frequency of the measurement signal transmitted from the wireless base station 10. It is generally known that propagation paths differ depending on the transmission frequency and the transmission band. Therefore, it is possible to measure the round trip delay time of different propagation paths depending on a plurality of frequencies and transmission bands.

このように、送信電力、変調方式・符号化率、周波数・伝送帯域を変更することで、伝搬路の反射環境が変更されるため、それらの往復遅延時間を平均化（重み付き平均も含む）することによって、電波到達時間を高精度に算出することができる。   In this way, by changing the transmission power, modulation scheme, coding rate, frequency and transmission band, the reflection environment of the propagation path is changed, so the round-trip delay times are averaged (including weighted averaging). By doing this, the radio wave arrival time can be calculated with high accuracy.

１０，５０ 無線基地局
１１ 分散アンテナ
１２ ケーブル
１３ アンテナ切替部
１４ 測定信号送信部
１５ 応答信号受信部
１６ 往復遅延時間測定部
１７ 電波到達時間算出部
１８ 位置推定部
２０，４０ 無線端末局
２１ アンテナ
２２ 測定信号受信部
２３ 応答信号送信部
３０ 反射物 10, 50 Wireless base station 11 Distributed antenna 12 Cable 13 Antenna switching unit 14 Measured signal transmission unit 15 Response signal reception unit 16 Round trip time measurement unit 17 Radio wave arrival time calculation unit 18 Position estimation unit 20, 40 Wireless terminal station 21 Antenna 22 Measurement signal receiver 23 Response signal transmitter 30 Reflected object

Claims (7)

分散配置される複数の分散アンテナを切り替えて送受信が可能な無線基地局と、該無線基地局と通信する無線端末局とを備え、該無線基地局が該無線端末局の位置を推定する無線端末局の位置推定方法において、
前記無線基地局が前記複数の分散アンテナごとに前記無線端末局との間の電波到達時間を測定する第１ステップと、
前記第１ステップで測定した前記複数の分散アンテナごとの電波到達時間を用いて前記無線端末局の位置を推定する第２ステップと
を有することを特徴とする無線端末局の位置推定方法。 A wireless terminal comprising: a wireless base station capable of transmitting and receiving by switching a plurality of distributed antennas disposed in a distributed manner; and a wireless terminal station communicating with the wireless base station, wherein the wireless base station estimates the position of the wireless terminal station In the station position estimation method,
A first step of the radio base station measuring a radio wave arrival time with the radio terminal station for each of the plurality of distributed antennas;
A second step of estimating the position of the wireless terminal station using the radio wave arrival time of each of the plurality of distributed antennas measured in the first step. 請求項１に記載の無線端末局の位置推定方法において、
前記第１ステップは、前記分散アンテナごとに接続されるケーブルの長さによる遅延時間を校正する機能を有する
ことを特徴とする無線端末局の位置推定方法。 In the wireless terminal station position estimation method according to claim 1,
A position estimation method of a wireless terminal station, wherein the first step has a function of calibrating a delay time according to a length of a cable connected to each of the distributed antennas. 請求項１に記載の無線端末局の位置推定方法において、
前記第１ステップは、前記無線端末局の内部における時間ずれを校正する機能を有する ことを特徴とする無線端末局の位置推定方法。 In the wireless terminal station position estimation method according to claim 1,
The position estimation method of a wireless terminal station, wherein the first step has a function of calibrating a time lag inside the wireless terminal station. 請求項１に記載の無線端末局の位置推定方法において、
前記第１ステップは、他無線局からの干渉による電波到達時間ずれを校正する機能を有する
ことを特徴とする無線端末局の位置推定方法。 In the wireless terminal station position estimation method according to claim 1,
A position estimation method of a wireless terminal station, wherein the first step has a function of calibrating a radio wave arrival time deviation due to interference from another wireless station. 請求項１に記載の無線端末局の位置推定方法において、
前記第１ステップは、前記無線基地局が送信する電波到達時間を測定するための測定信号の送信電力、または変調方式・符号化率、または周波数・伝送帯域を変更することで、電波反射による電波到達時間ずれを低減する機能を有する
ことを特徴とする無線端末局の位置推定方法。 In the wireless terminal station position estimation method according to claim 1,
The first step comprises changing the transmission power of the measurement signal for measuring the radio wave arrival time transmitted by the radio base station, or the modulation method / coding rate, or the radio wave by radio wave reflection by changing the frequency / transmission band. A position estimation method of a wireless terminal station having a function to reduce arrival time deviation. 所定の長さを有するケーブルを介して分散配置される複数の分散アンテナと、
無線端末局との電波到達時間を測定するための測定信号を送信する測定信号送信部と、 前記測定信号を受信した前記無線端末局から送信された応答信号を受信する応答信号受信部と、
前記複数の分散アンテナを切り替え、該切り替えた分散アンテナと前記測定信号送信部および前記応答信号受信部とを接続するアンテナ切替部と、
前記分散アンテナごとに、前記測定信号の送信から前記応答信号の受信までの往復遅延時間を測定する往復遅延時間測定部と、
前記分散アンテナごとに、前記往復遅延時間から電波到達時間を算出する電波到達時間算出部と、
前記分散アンテナごとの前記電波到達時間から前記無線端末局の位置を推定する位置推定部と
を備えたことを特徴とする無線基地局。 A plurality of distributed antennas distributed via cables having a predetermined length;
A measurement signal transmission unit that transmits a measurement signal for measuring a radio wave arrival time with a wireless terminal station; a response signal reception unit that receives a response signal transmitted from the wireless terminal station that has received the measurement signal;
An antenna switching unit that switches the plurality of distributed antennas and connects the switched distributed antenna to the measurement signal transmission unit and the response signal reception unit;
A round trip delay time measurement unit configured to measure a round trip delay time from transmission of the measurement signal to reception of the response signal for each of the distributed antennas;
A radio wave arrival time calculation unit that calculates a radio wave arrival time from the round trip delay time for each of the dispersed antennas;
A position estimation unit configured to estimate a position of the wireless terminal station from the radio wave arrival time for each of the distributed antennas. 請求項６に記載の無線端末局において、
前記分散アンテナごとに、前記測定信号の送信電力、または変調方式・符号化率、または周波数・伝送帯域を変更し、電波反射による前記電波到達時間ずれを低減する手段を備えた
ことを特徴とする無線端末局。 In the wireless terminal station according to claim 6,
It is characterized in that it comprises means for changing the transmission power of the measurement signal, or the modulation method / coding rate, or the frequency / transmission band for each of the distributed antennas, and reducing the radio wave arrival time deviation due to radio wave reflection. Wireless terminal station.
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