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JP4490882B2 - Reader / writer for wireless tag - Google Patents

Reader / writer for wireless tag Download PDF

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JP4490882B2
JP4490882B2 JP2005208427A JP2005208427A JP4490882B2 JP 4490882 B2 JP4490882 B2 JP 4490882B2 JP 2005208427 A JP2005208427 A JP 2005208427A JP 2005208427 A JP2005208427 A JP 2005208427A JP 4490882 B2 JP4490882 B2 JP 4490882B2
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reader
writer
wireless tag
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detected
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JP2007028274A (en
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義則 及川
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Tokin Corp
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NEC Tokin Corp
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Description

本発明は、無線タグとデータを無線で通信する無線タグ用リーダライタに関するものである。   The present invention relates to a reader / writer for a wireless tag that wirelessly communicates data with a wireless tag.

無線タグ用リーダライタは、情報を記憶出来るICチップとアンテナからなる無線タグとデータを送受信できる。このリーダライタは、無線タグが複数個ある場合にも衝突防止のアルゴリズムにより検出可能なシステムになっている。但し、リーダライタが通信可能なエリアに複数個存在する場合には、それぞれのリーダライタから発出される電波の干渉の影響を受けて、無線タグからの電波を受信できなくなる。リーダライタ間の電波の干渉を検出した場合に送出電力レベルを下げて、電波の干渉を避ける電波干渉の防止方法が、特許文献1に開示されている。また、電波の干渉をさけるために通信する周波数を変更する方式が、特許文献2に開示されている。   The wireless tag reader / writer can transmit / receive data to / from a wireless tag including an IC chip and an antenna capable of storing information. This reader / writer is a system that can be detected by a collision prevention algorithm even when there are a plurality of wireless tags. However, when there are a plurality of reader / writers in the communicable area, the radio wave from the wireless tag cannot be received due to the influence of the radio wave emitted from each reader / writer. Patent Document 1 discloses a method for preventing radio wave interference by reducing the transmission power level when radio wave interference between reader / writers is detected and avoiding radio wave interference. Also, Patent Document 2 discloses a method for changing the frequency of communication in order to avoid radio wave interference.

特許文献1のリーダライタ間における電波干渉の防止方法によるリーダライタの実施例の説明図を図4に示す。100は自リーダライタ、101はアンテナ、102は送信回路、105は制御回路、106は出力調整機能付き送信回路、107はリーダライタ間干渉検出回路を示している。自リーダライタ100からの返信信号と他のリーダライタからの送信信号とをアンテナ101を介して受信回路103で受信した場合は、リーダライタ間干渉検出回路107で電波の干渉を検出し、リーダライタ間干渉検出回路107からの指示により出力調整機能付き送信回路106で出力を低減して、電波を再度送信することで電波の干渉を防止している。   FIG. 4 is an explanatory diagram of an embodiment of a reader / writer according to a method for preventing radio wave interference between reader / writers of Patent Document 1. Reference numeral 100 denotes an own reader / writer, 101 denotes an antenna, 102 denotes a transmission circuit, 105 denotes a control circuit, 106 denotes a transmission circuit with an output adjustment function, and 107 denotes an inter-reader / writer interference detection circuit. When the receiving circuit 103 receives a reply signal from the reader / writer 100 and a transmission signal from another reader / writer via the antenna 101, the reader / writer interference detection circuit 107 detects radio wave interference, and the reader / writer In response to an instruction from the interfering interference detection circuit 107, the output is reduced by the transmission circuit 106 with an output adjustment function, and radio waves are transmitted again, thereby preventing radio wave interference.

特開2003−216911号公報JP 2003-216911 A 特開2000−4183号公報JP 2000-4183 A

上述した特許文献1のリーダライタは、出力を低減する調整機能を動作させることにより、自リーダライタ100の通信距離が短くなり、今まで認識できていた無線タグも認識できなくなるという問題点があった。   The reader / writer of Patent Document 1 described above has a problem in that the communication function of the reader / writer 100 is shortened by operating the adjustment function for reducing the output, and the wireless tag that has been recognized so far cannot be recognized. It was.

また、上述した特許文献2の電波干渉時に周波数を変更する方式は、周波数を変更するための回路が複雑で、変更後のそれぞれの周波数が再度一致して再び電波干渉を起こすことがないようにする制御手段が追加で必要になるという問題点があった。   In addition, the method of changing the frequency at the time of radio wave interference described in Patent Document 2 described above has a complicated circuit for changing the frequency, so that the frequency after the change does not coincide with each other again to cause radio wave interference again. There is a problem that an additional control means is required.

本発明は、上述した問題点を解決すべくなされたもので、その技術課題は、リーダライタが通信可能なエリアに複数個存在する場合に、リーダライタの通信エリアを狭めることなく、それぞれのリーダライタから発出される電波の干渉の影響を受けて、無線タグからの電波を受信できなくなる問題を解決した無線タグ用リーダライタを提供することである。   The present invention has been made to solve the above-described problems, and its technical problem is that when there are a plurality of reader / writers in an area where communication is possible, each reader / writer can be communicated without narrowing the communication area. It is an object of the present invention to provide a wireless tag reader / writer that solves the problem of being unable to receive radio waves from a radio tag due to the influence of radio waves emitted from a writer.

上記目的を達成するための第1の発明は、無線タグとデータを無線で通信する無線タグ用リーダライタにおいて、自リーダライタ以外の他リーダライタの信号を受信する手段と検出する手段を備え、前記検出する手段により前記他リーダライタの信号を検出した場合に、前記自リーダライタは無線タグとしての動作モードにはいり、前記他リーダライタの信号を検出しない場合は、前記自リーダライタは通常のリーダライタの動作モードに入るリーダライタ制御手段を持たせた無線タグ用リーダライタである。   According to a first aspect of the present invention, there is provided a wireless tag reader / writer that wirelessly communicates data with a wireless tag, comprising: a means for receiving a signal from a reader / writer other than the reader / writer; When the signal of the other reader / writer is detected by the detecting means, the own reader / writer enters an operation mode as a wireless tag, and when the signal of the other reader / writer is not detected, the own reader / writer This is a RFID tag reader / writer provided with reader / writer control means for entering an operation mode of the reader / writer.

上記目的を達成するための第2の発明は、前記無線タグと通信中に前記他リーダライタの信号を検出した場合に、前記自リーダライタで検出可能な前記無線タグの検出と制御を全て終了した後に、前記他リーダライタに前記自リーダライタでの処理が終了したことを伝え、前記自リーダライタが無線タグとしての動作モードに入るように制御するリーダライタ制御手段を持たせた無線タグ用リーダライタである。   According to a second aspect of the invention for achieving the above object, when the signal of the other reader / writer is detected during communication with the wireless tag, the detection and control of the wireless tag that can be detected by the reader / writer are all completed. After that, the other reader / writer is notified of the end of the processing in the own reader / writer, and the reader / writer control means for controlling the own reader / writer to enter the operation mode as a wireless tag is provided. It is a reader / writer.

上記目的を達成するための第3の発明は、前記無線タグと通信中に前記他リーダライタの信号を検出した場合に、前記自リーダライタと前記他リーダライタのID番号又は優先度識別を比較して、前記自リーダライタの優先度が高い場合には前記自リーダライタの処理を継続し、前記他リーダライタの優先度が高い場合には前記自リーダライタは無線タグとしての動作モードに入るように制御するリーダライタ制御手段を持たせた無線タグ用リーダライタである。   According to a third aspect of the invention for achieving the above object, when the signal of the other reader / writer is detected during communication with the wireless tag, the ID number or priority identification of the own reader / writer and the other reader / writer are compared. When the priority of the reader / writer is high, the processing of the reader / writer is continued, and when the priority of the other reader / writer is high, the reader / writer enters an operation mode as a wireless tag. This is a RFID tag reader / writer provided with a reader / writer control means for controlling as described above.

本発明によれば、自リーダライタ以外のリーダライタの信号を受信する手段と検出する手段を備えることで、検出手段により自リーダライタ以外の他リーダライタの信号を検出した場合に、自リーダライタは無線タグの動作モードにはいり、自リーダライタ以外の他リーダライタの信号を検出しない場合に、自リーダライタは通常のリーダライタの動作モードに入るリーダライタ制御手段を持たせることで、複数のリーダライタが存在した時でも、リーダライタの通信エリアを狭めることなく、それぞれの無線タグと通信できる。なお、本発明では出力を低減する調整機能が不要なので、リーダライタの通信エリアが狭まるような現象は起きない。   According to the present invention, when the signal of the reader / writer other than the own reader / writer is detected by the detecting means by including the means for receiving and detecting the signal of the reader / writer other than the own reader / writer, If the reader / writer enters the operation mode of the wireless tag and does not detect any other reader / writer signals other than the reader / writer, the reader / writer has a reader / writer control means for entering the normal reader / writer operation mode. Even when the reader / writer exists, communication with each wireless tag can be performed without narrowing the communication area of the reader / writer. In the present invention, since an adjustment function for reducing output is not required, a phenomenon that the communication area of the reader / writer is narrowed does not occur.

また、無線タグと通信中に他リーダライタの信号を検出した場合に、自リーダライタで検出可能な無線タグの検出、制御を全て終了した後に、他リーダライタに自リーダライタでの処理が終了したことを伝え、自リーダライタは無線タグの動作モードに入る制御手段を持たせることで、簡単な構成で、リーダライタの本来の動作を交互に行うことでリーダライタ間の電波の干渉を防止できる。   In addition, when a signal of another reader / writer is detected during communication with the wireless tag, after the detection and control of the wireless tag that can be detected by the own reader / writer are completed, the processing of the own reader / writer is completed by the other reader / writer. The reader / writer itself has a control means to enter the operation mode of the wireless tag, thereby preventing the interference of radio waves between the reader / writer by performing the original operation of the reader / writer alternately with a simple configuration. it can.

更に、リーダライタの信号衝突を検出した場合には、自リーダライタと他リーダライタのID番号又は優先度識別を比較して、自リーダライタの優先度が高い場合には自リーダライタの処理を継続し、他リーダライタの優先度が高い場合には自リーダライタは無線タグの動作モードに入る制御手段を持たせることで、簡単な構成で、リーダライタの本来の動作を交互に行うことでリーダライタ間の電波の干渉を防止し、重要度の設定により読み取り権利(リーダライタ権)を変更できる。   Further, when a signal collision of the reader / writer is detected, the ID number or priority identification between the own reader / writer and the other reader / writer is compared, and if the priority of the own reader / writer is high, the processing of the own reader / writer is performed. If the priority of other reader / writers is high, the reader / writer itself has a control means to enter the operation mode of the wireless tag so that the original operation of the reader / writer can be performed alternately with a simple configuration. Interference of radio waves between reader / writers can be prevented, and reading rights (reader / writer rights) can be changed by setting importance.

その結果、リーダライタが通信可能なエリアに複数個存在する場合に、リーダライタの通信エリアを狭めることなく、それぞれのリーダライタから発出される電波の干渉の影響を受けて、無線タグからの電波を受信できなくなる問題を解決した無線タグ用リーダライタの提供が可能になる。   As a result, when there are multiple reader / writers in the communicable area, radio waves from the wireless tag are affected by the interference of radio waves emitted from each reader / writer without narrowing the communication area of the reader / writer. It is possible to provide a reader / writer for a wireless tag that solves the problem of not receiving the signal.

本発明を実施するための最良の形態に係る無線タグ用リーダライタを以下に図面を参照して詳細に説明する。   A wireless tag reader / writer according to the best mode for carrying out the present invention will be described below in detail with reference to the drawings.

図1は、本発明の無線タグ用リーダライタの実施の形態1を示す図である。図2は、本発明の無線タグ用リーダライタの動作状態を説明する図である。図3は、本発明の無線タグ用リーダライタの実施の形態2での動作状態を説明する図である。   FIG. 1 is a diagram showing Embodiment 1 of a reader / writer for a wireless tag according to the present invention. FIG. 2 is a diagram for explaining the operating state of the RFID tag reader / writer according to the present invention. FIG. 3 is a diagram for explaining an operation state of the RFID tag reader / writer according to the second embodiment of the present invention.

図1に示すように、本発明の無線タグ用リーダライタは、送信回路102、自リーダライタ以外のリーダライタの信号を受信する受信回路103と検出する他リーダライタ信号検出回路104を備えている。   As shown in FIG. 1, the reader / writer for a wireless tag according to the present invention includes a transmission circuit 102, a reception circuit 103 that receives a signal from a reader / writer other than the reader / writer, and another reader / writer signal detection circuit 104 that detects the signal. .

図2に示すように、リーダライタAが通信を開始しようとした場合は、最初に「他リーダライタからの信号が送られていないか」を他リーダライタ信号検出回路104で確認する。その結果、「リーダライタからの信号を検出できない場合」は、「そのまま通常のリーダライタの動作に入る」ようにし、他のリーダライタからの信号を検出した場合には「通常のリーダライタの動作は実行させない」ようにする。   As shown in FIG. 2, when the reader / writer A tries to start communication, the other reader / writer signal detection circuit 104 first checks whether “a signal from another reader / writer is being sent”. As a result, “when the signal from the reader / writer cannot be detected” is set to “enter the normal reader / writer operation as it is”, and when the signal from another reader / writer is detected, “the normal reader / writer operation” "Do not run".

このような手段を備えることで、複数のリーダライタが存在した時でも、リーダライタの通信エリアを狭めることなく、それぞれの無線タグとリーダライタの通信ができる。なお、本発明では出力を低減する調整機能が不要なので、リーダライタの通信エリアが狭まるような現象は起きない。   By providing such means, even when there are a plurality of reader / writers, communication between each wireless tag and the reader / writer can be performed without narrowing the communication area of the reader / writer. In the present invention, since an adjustment function for reducing output is not required, a phenomenon that the communication area of the reader / writer is narrowed does not occur.

図2は、既に無線タグと通信中の他リーダライタBの信号を検出した場合について説明している。この場合には、リーダライタAは「既に動作中の他のリーダライタが存在する」と判断し、制御回路105を「タグモードで動作させる」。タグモードでの動作後に、リーダライタAは他の無線タグと同様に、「自分のID番号をリーダライタB」に返送する。リーダライタBは「新規無線タグ」を検出し、「検出した無線タグのID」を全部読み込む。「読み込んだIDよりリーダライタAであること」を認識できる。この場合は、引き続き全無線タグのIDを読み取り、処理等が終了した段階で、リーダライタとして動作する権利すなわちリーダライタ権をリーダライタAに移譲し、リーダライタBはタグモードに移行する。リーダライタ権を受け取ったリーダライタAはタグモードからリーダライタモードに変更し、通常のリーダライタの動作をする。このように交互にリーダライタ本来の動作を行うことで、通信エリアを狭めることなく、複数のリーダライタが存在してもそれぞれのリーダライタから発出される電波の干渉の影響を受けないで通信が可能になる。   FIG. 2 illustrates a case where a signal of another reader / writer B that is already communicating with the wireless tag is detected. In this case, the reader / writer A determines that “another reader / writer already in operation exists”, and causes the control circuit 105 to “operate in the tag mode”. After the operation in the tag mode, the reader / writer A returns “its own ID number to the reader / writer B” in the same manner as other wireless tags. The reader / writer B detects “new wireless tag” and reads all “ID of detected wireless tag”. It can be recognized that the reader / writer A is based on the read ID. In this case, the IDs of all the wireless tags are continuously read, and the right to operate as a reader / writer, that is, the reader / writer right, is transferred to the reader / writer A when the processing and the like are completed, and the reader / writer B shifts to the tag mode. Upon receiving the reader / writer right, the reader / writer A changes from the tag mode to the reader / writer mode and operates as a normal reader / writer. By performing the original operation of the reader / writer alternately in this way, communication can be performed without being affected by the interference of radio waves emitted from each reader / writer even if there are multiple reader / writers without narrowing the communication area. It becomes possible.

図3は、リーダライタBでリーダライタAの存在を検出した場合について説明している。リーダライタAとリーダライタBとに予め付議されていた優先度またはID番号を見て、自リーダライタ(リーダライタB)が高い場合は、「自リーダライタでの処理を継続」し、他リーダライタ(リーダライタA)が高い場合には、「リーダライタ権をリーダライタAに移譲し、自らはタグモードになり無線タグの動作」をする。この場合も、交互にリーダライタ本来の動作を行うことで、通信エリアを狭めることなく、複数のリーダライタが存在してもそれぞれのリーダライタから発出される電波の干渉の影響を受けないで通信が可能になる。   FIG. 3 illustrates a case where the reader / writer B detects the presence of the reader / writer A. If the reader / writer A and reader / writer B look at the priorities or ID numbers preliminarily discussed and the reader / writer (reader / writer B) is high, “continue processing in the reader / writer” and other readers When the writer (reader / writer A) is high, the reader / writer right is transferred to the reader / writer A, and the tag mode is entered so that the wireless tag operates. Even in this case, the original operation of the reader / writer is performed alternately, so that communication is not affected by the interference of radio waves emitted from each reader / writer even if there are multiple reader / writers without narrowing the communication area. Is possible.

その結果、リーダライタが通信可能なエリアに複数個存在する場合に、リーダライタの通信エリアを狭めることなく、それぞれのリーダライタから発出される電波の干渉の影響を受けて、無線タグからの電波を受信できなくなる問題を解決した無線タグ用リーダライタの提供が可能になる。   As a result, when there are multiple reader / writers in the communicable area, radio waves from the wireless tag are affected by the interference of radio waves emitted from each reader / writer without narrowing the communication area of the reader / writer. It is possible to provide a reader / writer for a wireless tag that solves the problem of not receiving the signal.

本発明の無線タグ用リーダライタの実施の形態1を示す図。1 is a diagram showing Embodiment 1 of a wireless tag reader / writer according to the present invention. FIG. 本発明の無線タグ用リーダライタの動作状態を説明する図。6A and 6B illustrate an operation state of a wireless tag reader / writer according to the present invention. 本発明の無線タグ用リーダライタの実施の形態2での動作状態を説明する図。8A and 8B illustrate an operation state of a wireless tag reader / writer according to a second embodiment of the present invention. 特許文献1のリーダライタ間における電波干渉の防止方法によるリーダライタの実施例の説明図。Explanatory drawing of the Example of the reader / writer by the prevention method of the radio wave interference between the reader / writer of patent document 1. FIG.

符号の説明Explanation of symbols

100 自リーダライタ
101 アンテナ
102 送信回路
103 受信回路
104 他リーダライタ信号検出回路
105 制御回路
106 出力調整機能付き送信回路
107 リーダライタ間干渉検出回路
DESCRIPTION OF SYMBOLS 100 Own reader / writer 101 Antenna 102 Transmission circuit 103 Reception circuit 104 Other reader / writer signal detection circuit 105 Control circuit 106 Transmission circuit 107 with output adjustment function Interference detection circuit between reader / writers

Claims (3)

無線タグとデータを無線で通信する無線タグ用リーダライタにおいて、自リーダライタ以外の他リーダライタの信号を受信する手段と検出する手段を備え、前記検出する手段により前記他リーダライタの信号を検出した場合に、前記自リーダライタは無線タグとしての動作モードにはいり、前記他リーダライタの信号を検出しない場合は、前記自リーダライタは通常のリーダライタの動作モードに入るリーダライタ制御手段を持たせたことを特徴とする無線タグ用リーダライタ。   A wireless tag reader / writer that wirelessly communicates data with a wireless tag includes means for receiving a signal of a reader / writer other than the reader / writer and a means for detecting the signal, and the signal of the other reader / writer is detected by the detecting means. In this case, the reader / writer enters the operation mode as a wireless tag, and if the signal of the other reader / writer is not detected, the reader / writer has reader / writer control means for entering the normal reader / writer operation mode. A reader / writer for a wireless tag, characterized in that 前記無線タグと通信中に前記他リーダライタの信号を検出した場合に、前記自リーダライタで検出可能な前記無線タグの検出と制御を全て終了した後に、前記他リーダライタに前記自リーダライタでの処理が終了したことを伝え、前記自リーダライタが無線タグとしての動作モードに入るように制御するリーダライタ制御手段を持たせたことを特徴とする請求項1記載の無線タグ用リーダライタ。   When the signal of the other reader / writer is detected during communication with the wireless tag, after the detection and control of the wireless tag that can be detected by the own reader / writer are all completed, the other reader / writer 2. The reader / writer for a wireless tag according to claim 1, further comprising reader / writer control means for controlling that the reader / writer is in an operation mode as a wireless tag. 前記無線タグと通信中に前記他リーダライタの信号を検出した場合に、前記自リーダライタと前記他リーダライタのID番号又は優先度識別を比較して、前記自リーダライタの優先度が高い場合には前記自リーダライタの処理を継続し、前記他リーダライタの優先度が高い場合には前記自リーダライタは無線タグとしての動作モードに入るように制御するリーダライタ制御手段を持たせたことを特徴とする請求項1記載の無線タグ用リーダライタ。   When the signal of the other reader / writer is detected during communication with the wireless tag, the ID of the reader / writer and the reader / writer are compared with each other, and the priority of the reader / writer is high. The reader / writer is provided with reader / writer control means for controlling the reader / writer to enter an operation mode as a wireless tag when the priority of the other reader / writer is high. The reader / writer for a wireless tag according to claim 1.
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JP2008197754A (en) * 2007-02-09 2008-08-28 Chuo Electronics Co Ltd Rfid reader/writer device
KR100897802B1 (en) * 2007-06-21 2009-05-15 한국과학기술원 Anti-collision method for radio frequency identification readers and radio frequency identification reader
JP5207284B2 (en) * 2008-02-08 2013-06-12 エスアイアイ・データサービス株式会社 Payment system and non-contact IC compatible processing device

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JPH10293824A (en) * 1997-04-18 1998-11-04 Omron Corp Identification system and data reading device
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