JPH03128534A - Data communication method for mobile object communication system - Google Patents

Data communication method for mobile object communication system

Info

Publication number
JPH03128534A
JPH03128534A JP1266834A JP26683489A JPH03128534A JP H03128534 A JPH03128534 A JP H03128534A JP 1266834 A JP1266834 A JP 1266834A JP 26683489 A JP26683489 A JP 26683489A JP H03128534 A JPH03128534 A JP H03128534A
Authority
JP
Japan
Prior art keywords
signal
circuit
data
transmission
communication device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP1266834A
Other languages
Japanese (ja)
Inventor
Yoshihiro Nishimura
西村 良博
Kazuhiro Kozuka
小塚 一宏
Hidehiro Tomioka
富岡 秀宏
Arata Yamamoto
新 山本
Norikazu Ota
則一 太田
Yoshihisa Harada
義久 原田
Soichi Ishikawa
石川 爽一
Takehiko Okuda
奥田 武彦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Toyota Central R&D Labs Inc
Original Assignee
Toyota Motor Corp
Toyota Central R&D Labs Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp, Toyota Central R&D Labs Inc filed Critical Toyota Motor Corp
Priority to JP1266834A priority Critical patent/JPH03128534A/en
Publication of JPH03128534A publication Critical patent/JPH03128534A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To immediately start the transmission of data and to prevent the useless time of communication from being generated by using a preamble signal for synchronization, which is transmitted from a fixed side communication equipment to a mobile object side communication equipment before a data signal, as an activation signal. CONSTITUTION:A signal processing circuit 16 of an inquiry device 1 sends out the preamble signal as the activation signal to a transmission circuit 11. When a response device 2 fitted to a mobile object receives the rise of the preamble signal, a signal processing circuit 26 starts operation and a transmission circuit 28 modulates a non-modulation wave, which arrives at a transmission/reception antenna 29, by a response signal and returns the wave to the inquiry device 1. The inquiry device 1 fetches the response signal through a transmission/reception circuit 14 to the signal processing circuit 16 and immediately outputs the data signal to the transmission circuit 11. The data signal is inputted to a modulation circuit 12 and transmitted as the electromagnetic wave of a frequency f1 from a transmission antenna 13.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は移動体通信システムにおけるデータ通信方法に
関し、特に効率的な通信を行うことが可能な通信方法に
関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data communication method in a mobile communication system, and particularly to a communication method that allows efficient communication.

[従来の技術] 固定側に設けた通信機(質問器)と、タグと呼ばれる移
動体側に設ける簡易な通信fi(応答器)との間で通信
を行う移動体通信システムが注目されており、例えば質
問器の交信領域内に至った物または人を認識してデータ
通信する等の用途に使用されている。
[Prior Art] Mobile communication systems that perform communication between a communication device (interrogator) installed on a fixed side and a simple communication FI (transponder) installed on a mobile side called a tag are attracting attention. For example, it is used for purposes such as recognizing objects or people that have come within the communication area of the interrogator and communicating data.

かかる移動体通信システムにおいて、上記応答器の電源
は、手軽さと軽量な点で電池を使用する場合が殆どであ
り、電力消費を低減して電池寿命を延ばすことが一つの
課題である。
In such mobile communication systems, batteries are often used as the power source for the transponders due to their simplicity and light weight, and one challenge is to reduce power consumption and extend battery life.

これを解決する方法として、常時は質問信号〈起動信号
〉の受信に必要な回路のみに電源を供給し、起動信号を
受信した時点でスイッチ回路を作動せしめて残る回路に
給電することが行われている(例えば、特開昭61−2
01177号公報)。
One way to solve this problem is to always supply power to only the circuits necessary to receive the interrogation signal (start signal), and when the start signal is received, the switch circuit is activated to supply power to the remaining circuits. (For example, JP-A-61-2
01177).

[発明が解決しようとする課B] ところで、実際の移動体通信システムにおいては、応答
器に書込むデータの送信に先立って、応答器との同期を
取るためのプリアンブル信号を質問器より発信しており
、このプリアンブル信号は通常、ビット同期信号とキャ
ラクタ同期信号よりなる。
[Problem B to be solved by the invention] By the way, in an actual mobile communication system, the interrogator transmits a preamble signal to synchronize with the transponder before transmitting data to be written to the transponder. This preamble signal usually consists of a bit synchronization signal and a character synchronization signal.

これを第3図で説明すると、質問器からは常時起動信号
が出力され、交信領域内に進入した応答器より識別信号
を含む応答信号があると(図中矢印)、応答器へプリア
ンブル信号を出力して同期を収り、この後、データを送
出する。
To explain this with Figure 3, the interrogator always outputs a start signal, and when a response signal including an identification signal is received from a transponder that has entered the communication area (arrow in the figure), a preamble signal is sent to the transponder. Output, synchronize, and then send the data.

このプリアンブル信号の送信の間は、実質的なデータ送
信がなされない通信無効時間であり、限られた交信領域
内を短時間に通過する応答器に対して十分なデータを書
込むには、通信の効率化が必要である。
During the transmission of this preamble signal, there is a communication ineffective time during which no data is actually transmitted. It is necessary to improve efficiency.

本発明はかかる課題を解決するもので、データ書込み時
の通信無効時間を解消して、効率的な通信を可能とした
移動体通信システムにおけるデータ通信方法を提供する
ことを目的とする。
SUMMARY OF THE INVENTION The present invention has been made to solve this problem, and an object of the present invention is to provide a data communication method in a mobile communication system that eliminates communication invalid time during data writing and enables efficient communication.

[課題を解決するための手段] 本発明の要旨は、固定側に設けた通信機と、上記固定側
通信機からの起動信号を受信して作動を開始する、移動
体側に設けた通信機との間のブタ通信方法であって、デ
ータ信号に先立って上記固定側通信機より移動体側通信
機へ送信される同期用プリアンブル信号を、上記起動信
号として使用するものである。
[Means for Solving the Problems] The gist of the present invention is to provide a communication device provided on a fixed side, and a communication device provided on a mobile body that starts operation upon receiving an activation signal from the fixed side communication device. This communication method uses a synchronization preamble signal, which is transmitted from the fixed communication device to the mobile communication device prior to the data signal, as the activation signal.

[作用] 上記データ通信方法において、固定側通信機との交信領
域内に進入した移動体側通信機は、起動信号としてのプ
リアンブル信号を受信すると作動を開始し、応答信号を
発する。応答信号を受信した固定側通信機は移動体側通
信機に対してデータを送信するが、プリアンブル信号が
既に発信されて応答器との間に同期が取れているため、
データの送信は即座に開始され、通信無駄時間を生じる
ことがない。
[Operation] In the above data communication method, the mobile side communication device that has entered the communication area with the fixed side communication device starts operating when it receives a preamble signal as an activation signal and issues a response signal. The fixed-side communication device that received the response signal sends data to the mobile-side communication device, but since the preamble signal has already been transmitted and synchronization has been established with the transponder,
Data transmission starts immediately and there is no communication waste time.

[発明の効果] 以上の如く、本発明のデータ通信方法によれば、移動体
側通信機への起動信号を同期用プリアンブル信号で兼用
しているから、移動体側通信機より応答があった後は、
改めてプリアンブル信号を発信することなく、即座にデ
ータを送信することができ、無駄時間が解消される。こ
れにより、限られた交信領域を通過する移動体側通信機
に対して効率的にデータを送信することができる。
[Effects of the Invention] As described above, according to the data communication method of the present invention, since the synchronization preamble signal is also used as the activation signal to the mobile side communication device, after receiving a response from the mobile side communication device, ,
Data can be transmitted immediately without transmitting a preamble signal again, eliminating wasted time. Thereby, data can be efficiently transmitted to mobile communication devices passing through a limited communication area.

[実施例」 第1図には本発明を使用したタグ通信システムの構成を
示す。図において、固定側通信機は質問器■となってお
り、例えば生産ラインの近傍に固定して設けられる。上
記質問器■は、起動信号としてのプリアンブル信号、あ
るいは命令を含むデータ信号を送信する送信回路11、
上記送信回路11より送出される信号により周波数f1
の搬送波を変調する変調回路12、変調波を電磁波とし
て発信する発信アンテナ13、無変調の周波数f2の高
周波を発するとともに変調されて戻る上記高周波よりデ
ータ信号を取出す送受信回路14、これに接続された送
受信アンテナ■5、およびコンピュータを含む信号処理
回路16より構成されている。
[Embodiment] FIG. 1 shows the configuration of a tag communication system using the present invention. In the figure, the fixed-side communication device is an interrogator (2), which is fixedly installed near a production line, for example. The above-mentioned interrogator (■) includes a transmitting circuit 11 that transmits a preamble signal as a starting signal or a data signal containing a command;
The frequency f1 is determined by the signal sent from the transmitting circuit 11.
A modulation circuit 12 that modulates a carrier wave of It is composed of a transmitting/receiving antenna 5 and a signal processing circuit 16 including a computer.

移動体側通信機は応答器(タグ〉となっており、生産ラ
インを移動する組立部品等の移動体に取付けられる。上
記応答器2は、上記プリアンブル信号を起動信号として
受信する起動信号受信回路2■、上記データ信号を受信
するデータ信号受信回路22、上記起動信号受信回路2
1により作動せしめられるスイッチ回’ii@23、上
記発信アンテナ13より発信された電磁波を受ける受信
アンテナ24、該受信アンテナ24に接続されて変調波
を検波し、上記プリアンブル信号ないしデータ信号を得
る検波回路25、コンピュータを含む信号処理回路26
、データを記憶する記憶回路27、識別信号を含む応答
信号を送信する送信回路28、上記周波数f2の無変調
電磁波を受信してこれをデータ信号で変調して返送する
送受信アンテナ29、および電池等の電源30より構成
されている。
The mobile body side communication device is a transponder (tag) and is attached to a movable body such as an assembly part moving on a production line.The transponder 2 includes a start signal receiving circuit 2 that receives the preamble signal as a start signal. ■, the data signal receiving circuit 22 that receives the data signal, and the activation signal receiving circuit 2;
1, a receiving antenna 24 receives the electromagnetic waves transmitted from the transmitting antenna 13, and a detector connected to the receiving antenna 24 detects the modulated wave to obtain the preamble signal or data signal. circuit 25, signal processing circuit 26 including a computer
, a memory circuit 27 that stores data, a transmitting circuit 28 that transmits a response signal including an identification signal, a transmitting/receiving antenna 29 that receives the unmodulated electromagnetic wave of frequency f2, modulates it with a data signal, and sends it back, and a battery. The power source 30 is comprised of a power source 30.

上記電源30には、上記起動信号受信回路21、スイッ
チ回路23、および検波回路25が直接接続され、また
、データ信号受信回路22、信号処理回路26、記憶回
路27、および送信図Fl@2Bは上記スイッチ回路2
3を介して電源30に接続されている。
The activation signal receiving circuit 21, switch circuit 23, and detection circuit 25 are directly connected to the power supply 30, and the data signal receiving circuit 22, signal processing circuit 26, storage circuit 27, and transmission diagram Fl@2B are connected directly to the power supply 30. Above switch circuit 2
3 to a power source 30.

上記構成の通信システムにおいて、質問器■の信号処理
回路16は、送信回路11へ起動信号としてのプリアン
ブル信号を送出する。このプリアンブル信号は、第2図
に示す如く、ビット同期とキャラクタ同期の各信号が交
互に現われるものである。上記プリアンブル信号は変調
回路上2に入力し、周波数f1の電磁波として送信アン
テナ13より送信される。同時に上記信号処理口Fi@
 16は、制御信号16aにより送受信回路14を作動
せしめ、周波数f2の無変調波を送受信アンテナ15よ
り発信せしめる。
In the communication system configured as described above, the signal processing circuit 16 of the interrogator (2) sends out a preamble signal as a starting signal to the transmitting circuit 11. As shown in FIG. 2, this preamble signal is one in which bit synchronization and character synchronization signals appear alternately. The preamble signal is input to the modulation circuit 2 and transmitted from the transmitting antenna 13 as an electromagnetic wave of frequency f1. At the same time, the above signal processing port Fi@
16 operates the transmitter/receiver circuit 14 in response to the control signal 16a, and causes the transmitter/receiver antenna 15 to transmit an unmodulated wave of frequency f2.

移動体に取付けられた応答器2が、上記質問器上の送信
エリア内に至ると、受信アンテナ24により周波数f1
の電磁波が受信され、検波されて周波数帯域の低い起動
信号受信回路21に入力する。プリアンブル信号の立上
りを受信した受信図″路21は、スイッチ作動信号を発
してスイッチ回路23を作動せしめ、これにより、各回
路22.26.27.28への電源供給が開始される。
When the transponder 2 attached to the mobile body reaches the transmission area above the interrogator, the receiving antenna 24 transmits the frequency f1.
The electromagnetic waves are received, detected, and input to the activation signal receiving circuit 21 having a low frequency band. The receiving circuit 21, which has received the rising edge of the preamble signal, issues a switch activation signal to activate the switch circuit 23, thereby starting to supply power to each circuit 22, 26, 27, 28.

信号処理回路26が作動を開始し、データ信号受信回路
22を経て入力したプリアンブル信号により、将来入力
するデータ信号に対する同期を収るとともに、応答信号
を送信回路28へ送る。送信回路28は送受信アンテナ
29に至った上記無変調波を応答信号で変調して質問器
1に向けて返送する。質問器1は送受信アンテナ上5に
より、上記変調された電磁波を受け、送受信回路14を
経て上記応答信号を信号処理回路工6に収り込む。
The signal processing circuit 26 starts operating, uses the preamble signal input via the data signal receiving circuit 22 to synchronize with a data signal to be input in the future, and sends a response signal to the transmitting circuit 28. The transmitting circuit 28 modulates the unmodulated wave reaching the transmitting/receiving antenna 29 with a response signal and sends it back to the interrogator 1. The interrogator 1 receives the modulated electromagnetic wave through the transmitting/receiving antenna 5, and transmits the response signal to the signal processing circuit 6 via the transmitting/receiving circuit 14.

信号処理回路16は上記応答信号を確認すると(第2図
の矢印)、送信回路11に対して即座にデータ信号を出
力する。データ信号は変調回路12に入力し、送信アン
テナ13より周波数f1の電磁波として発信される。
When the signal processing circuit 16 confirms the response signal (arrow in FIG. 2), it immediately outputs a data signal to the transmitting circuit 11. The data signal is input to the modulation circuit 12 and transmitted from the transmitting antenna 13 as an electromagnetic wave with a frequency f1.

上記電磁波は応答器2の受信アンテナ24で受信され、
検波されてデータ信号受信回路22に入力し、これを経
て信号処理回路26へ至る。信号処理回路26は、上記
データ信号が純粋なデータであればこれを記憶回路27
ヘストアし、上記データ信号が読出し命令であれば、記
憶回路27の所定番地より必要なデータ信号を読み出し
てこれを送信回路28へ出力し、上記データ信号で周波
数f2の無変調波を変調して送受信アンテナ29を介し
て質問器■へ送る。
The electromagnetic waves are received by the receiving antenna 24 of the transponder 2,
The signal is detected and input to the data signal receiving circuit 22, and then reaches the signal processing circuit 26. If the data signal is pure data, the signal processing circuit 26 stores it in the storage circuit 27.
If the data signal is a read command, the necessary data signal is read from a predetermined location in the storage circuit 27 and outputted to the transmitting circuit 28, and the non-modulated wave of frequency f2 is modulated with the data signal. It is sent to the interrogator (■) via the transmitting/receiving antenna 29.

応答器2へのデータの書込みで通信を終了する場合には
、上記応答器2は受けたデータの最後についたデータ終
了信号を検出し、データに誤りがなければ質問器1への
データ了解信号をもどし、信号処理回路26の出力でス
イッチ回路23の作動が停止されて上記回路26および
他の回路22.27.28への給電が終了する。また応
答器2からのデータの涜出しで通信を終了する場合には
、応答器2は読出しデータの最後にデータ終了信号を付
けて送出し、これを検出し、データが正常に読出された
事を確認した質問器lからのデータ了解信号をアンテナ
13.24を経て応答器2のデータ信号受信回路22に
入力し、信号処理回路26の出力でスイッチ回路23の
作動が停止せしめられて、上記回路26および他の各回
路22.27.28への給電が終了する。
When terminating communication by writing data to the transponder 2, the transponder 2 detects a data end signal at the end of the received data, and if there is no error in the data, sends a data acknowledgment signal to the interrogator 1. is restored, the operation of the switch circuit 23 is stopped by the output of the signal processing circuit 26, and the power supply to the circuit 26 and other circuits 22, 27, and 28 is terminated. In addition, when communication is terminated due to data being output from the transponder 2, the transponder 2 sends out a data end signal with a data end signal added to the end of the read data, detects this, and confirms that the data has been read normally. The data acknowledgment signal from the interrogator 1 that has confirmed the above is input to the data signal receiving circuit 22 of the transponder 2 via the antenna 13.24, and the operation of the switch circuit 23 is stopped by the output of the signal processing circuit 26. Power supply to circuit 26 and each other circuit 22, 27, 28 is terminated.

なお、上記実施例において、質問器lの送信回路11の
機能の全部または一部を信号処理回路(6のソフトウェ
アで処理しても良く、また、応答器2の記憶回路27に
ランダムアクセスメモリ(RAM)を使用する場合には
、これへの電源供給は常時行う。
In the above embodiment, all or part of the functions of the transmission circuit 11 of the interrogator 1 may be processed by the software of the signal processing circuit (6), and the memory circuit 27 of the transponder 2 may be provided with a random access memory ( When using RAM), power is constantly supplied to it.

さらに、キャラクタ同期信号でビット同期も兼用すれば
、より短時間での信号同期が可能となる。
Furthermore, if the character synchronization signal is also used for bit synchronization, signal synchronization can be achieved in a shorter time.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の移動体通信システムをタグ通信に適用
した場合の全体構成ブロック図、第2図は本発明におけ
る質問器の信号出力順序を示す図、第3図は従来例にお
ける質問器の信号出力順序を示す口である。 ■・・・質問器(固定側通信機〉 ■1・・・送信回路 2・・・応答器(移動体側通信機) 21・・・起動信号受信回路 22・・・データ信号受信回路
Figure 1 is a block diagram of the overall configuration when the mobile communication system of the present invention is applied to tag communication, Figure 2 is a diagram showing the signal output order of the interrogator in the present invention, and Figure 3 is the interrogator in the conventional example. This is a port indicating the signal output order. ■... Interrogator (fixed side communication device) ■1... Transmission circuit 2... Responder (mobile side communication device) 21... Start signal receiving circuit 22... Data signal receiving circuit

Claims (1)

【特許請求の範囲】[Claims] 固定側に設けた通信機と、上記固定側通信機からの起動
信号を受信して作動を開始する、移動体側に設けた通信
機との間のデータ通信方法であって、データ信号に先立
って上記固定側通信機より移動体側通信機へ送信される
同期用プリアンブル信号を、上記起動信号として使用す
ることを特徴とする移動体通信システムにおけるデータ
通信方法。
A data communication method between a communication device provided on a fixed side and a communication device provided on a mobile body that starts operation upon receiving an activation signal from the fixed side communication device, and which starts operation prior to the data signal. A data communication method in a mobile communication system, characterized in that a synchronization preamble signal transmitted from the fixed side communication device to the mobile side communication device is used as the activation signal.
JP1266834A 1989-10-13 1989-10-13 Data communication method for mobile object communication system Pending JPH03128534A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1266834A JPH03128534A (en) 1989-10-13 1989-10-13 Data communication method for mobile object communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1266834A JPH03128534A (en) 1989-10-13 1989-10-13 Data communication method for mobile object communication system

Publications (1)

Publication Number Publication Date
JPH03128534A true JPH03128534A (en) 1991-05-31

Family

ID=17436306

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1266834A Pending JPH03128534A (en) 1989-10-13 1989-10-13 Data communication method for mobile object communication system

Country Status (1)

Country Link
JP (1) JPH03128534A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018059919A (en) * 2016-09-30 2018-04-12 ザ・スウォッチ・グループ・リサーチ・アンド・ディベロップメント・リミテッド Process and system for determining distance between wearable object and base station

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018059919A (en) * 2016-09-30 2018-04-12 ザ・スウォッチ・グループ・リサーチ・アンド・ディベロップメント・リミテッド Process and system for determining distance between wearable object and base station

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