JP2015204588A - Road side radio device - Google Patents

Road side radio device Download PDF

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JP2015204588A
JP2015204588A JP2014084235A JP2014084235A JP2015204588A JP 2015204588 A JP2015204588 A JP 2015204588A JP 2014084235 A JP2014084235 A JP 2014084235A JP 2014084235 A JP2014084235 A JP 2014084235A JP 2015204588 A JP2015204588 A JP 2015204588A
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signal strength
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JP6364908B2 (en
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裕一郎 松下
Yuichiro Matsushita
裕一郎 松下
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Mitsubishi Electric Corp
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Abstract

PROBLEM TO BE SOLVED: To omit time and labor due to communication which is performed repeatedly many times between a road side radio device and an on-vehicle device if the RSSI value of an ACTC signal fluctuates.SOLUTION: A control device performs ACTC verification processing to repeatedly receive ACTC signals from an on-vehicle device via an antenna device, to measure reception signal strength values of the received ACTC signals, and to determine that communication is a success if the number of times when a measured reception signal strength value is larger than a prescribed reception signal strength threshold value is equal to or more than a prescribed number. The control device performs ACTC verification processing again by changing the reception signal strength threshold value to a smaller value if the measured reception signal strength value is smaller than the prescribed reception signal strength threshold value, continues to change until the reception signal strength value becomes larger than a reception signal strength threshold value after change; and finishes ACTC verification processing if the reception signal strength threshold value after change becomes smaller than a specified lower limit value.

Description

本発明は、路上に設置された路側無線装置に関する。   The present invention relates to a roadside apparatus installed on a road.

ＥＴＣシステム（Electronic Toll Collection System）は、有料道路の料金所ゲートに路側無線装置を設置し、料金所ゲート内のレーンを通行する車両に搭載された車載器と通信を行うことで、自動的に通行料金の収受処理を行う。路側無線装置のアンテナは、料金所ゲートの屋根の下に取り付けられることで、路面からの反射波が屋根に反射して通信のマルチパスを生じ、後続車、隣接走行車と誤通信する可能性がある。このため車載器からＡＣＴＣ（Ａｃｔｉｖａｔｉｏｎ Ｃｈａｎｎｅｌ）信号を繰り返し受信するとともに、ＡＣＴＣ信号のＲＳＳＩ（Ｒｅｃｅｉｖｅｄ Ｓｉｇｎａｌ Ｓｔｒｅｎｇｔｈ Ｉｎｄｉｃａｔｉｏｎ：受信信号強度）値を測定し、所定の値以上となるＲＳＳＩ値が複数回測定されている場合に、車載器との通信の開始を決定する路側無線装置が知られている（例えば特許文献１参照）。   The ETC system (Electronic Toll Collection System) automatically installs a roadside radio device at the toll gate of the toll road and communicates with the vehicle-mounted device that runs on the lane in the toll gate. Toll collection processing. Since the antenna of the roadside radio device is installed under the roof of the toll gate, reflected waves from the road surface may be reflected on the roof, causing multipath communication, and miscommunication with the following vehicles and adjacent vehicles There is. For this reason, the ACTC (Activation Channel) signal is repeatedly received from the vehicle-mounted device, and the RSSI (Received Signal Strength Indication) value of the ACTC signal is measured, and the RSSI value that is a predetermined value or more is measured a plurality of times. A roadside wireless device that determines the start of communication with the vehicle-mounted device is known (see, for example, Patent Document 1).

特開２０１１−２５９３８２号公報JP2011-259382A

近年、料金所に路側無線装置として再通信アンテナを設けることで、路側無線装置と車載器の通信が異常となった場合、またはＩＣカード未装着のため路側無線装置と正当に通信できない車載器（非ＥＴＣ車両）となった場合であっても、一定の条件を満たすとき、料金所側でオペレータが手動操作を行うことにより、再度路側無線装置と車載器の無線通信を行い、車載器の搭載車両を正常なＥＴＣ車両として正当に通信処理を行うことができる。   In recent years, by providing a re-communication antenna as a roadside wireless device at a toll booth, when the communication between the roadside wireless device and the vehicle-mounted device becomes abnormal, or because the IC card is not installed, the vehicle-mounted device that cannot properly communicate with the roadside wireless device ( Even if it becomes a non-ETC vehicle), when certain conditions are met, the operator performs manual operation on the toll gate side, so that the wireless communication between the roadside wireless device and the vehicle-mounted device is performed again, and the vehicle-mounted device is installed. The communication processing can be properly performed with the vehicle as a normal ETC vehicle.

従来の路側無線装置は、ＡＣＴＣ信号のＲＳＳＩ値が変動し、所定の閾値よりも小さくなることで、車載器との通信が１度も成功しなかった場合に、当該車載器の搭載車両の一般ドライバに対して、車載器アンテナの取り付け状態を確認するとともに、より通信し易い位置へ車両を誘導した後、通信が成功するまで繰り返し再通信を実行する。しかしながら通信成功するまでに時間を要するという問題があった。   A conventional roadside apparatus is generally used for a vehicle equipped with an on-vehicle device when the RSSI value of the ACTC signal fluctuates and becomes smaller than a predetermined threshold value so that communication with the on-vehicle device has never succeeded. While confirming the mounting state of the vehicle-mounted device antenna to the driver, the vehicle is guided to a position where communication is easier, and then re-communication is repeatedly performed until communication is successful. However, there is a problem that it takes time to succeed in communication.

この発明は係る課題を解決するためになされたものであって、ＡＣＴＣ信号のＲＳＳＩ値が変動した場合、路側無線装置と車載器の間で何度も繰り返し通信が行われる手間を省くことを目的とする。   This invention was made in order to solve the subject which concerns, Comprising: When the RSSI value of an ACTC signal fluctuates, it aims at saving the effort which repeats communication repeatedly between a roadside apparatus and an onboard equipment. And

この発明による路側無線装置は、車載器からのＡＣＴＣ（Ａｃｔｉｖａｔｉｏｎ Ｃｈａｎｎｅｌ）信号を、アンテナ装置を介して繰り返し受信し、受信したＡＣＴＣ信号の受信信号強度値を測定し、測定した受信信号強度値が所定の受信信号強度閾値よりも大きくなる回数が所定回数以上であった場合に通信成功と判断するＡＣＴＣ検定処理を行う制御装置であって、上記受信信号強度値が所定の受信信号強度閾値よりも小さい場合に、当該受信信号強度閾値をより小さい値に変更して再びＡＣＴＣ検定処理を行い、上記受信信号強度値が変更後の受信信号強度閾値よりも大きくなるまで変更し、かつ変更後の受信信号強度閾値が規定の下限値よりも小さくなったらＡＣＴＣ検定処理を終了する制御装置、を備えたものである。   The roadside apparatus according to the present invention repeatedly receives an ACTC (Activation Channel) signal from the vehicle-mounted device via the antenna device, measures the received signal strength value of the received ACTC signal, and the measured received signal strength value is predetermined. A control device that performs an ACTC test process that determines that communication is successful when the number of times that the received signal strength threshold is greater than or equal to a predetermined number of times, the received signal strength value being smaller than the predetermined received signal strength threshold In this case, the received signal strength threshold is changed to a smaller value, the ACTC test process is performed again, the received signal strength value is changed to become larger than the changed received signal strength threshold, and the changed received signal is changed. And a control device that terminates the ACTC verification process when the intensity threshold value becomes smaller than a prescribed lower limit value.

この発明によれば、ＡＣＴＣ検定処理の繰り返し回数がより少ない回数で、アンテナ装置の通信エリア外にいる車両の車載器との誤通信を防止することができる。   According to the present invention, erroneous communication with the vehicle-mounted device outside the communication area of the antenna device can be prevented with a smaller number of repetitions of the ACTC verification process.

実施の形態１による路側無線装置の構成を示す図である。1 is a diagram showing a configuration of a roadside apparatus according to Embodiment 1. FIG. 実施の形態１による路側無線装置の車載器との通信接続を許可するための判定を行うＡＣＴＣ検定処理を説明する図である。It is a figure explaining the ACTC verification process which performs the determination for permitting the communication connection with the onboard equipment of the roadside apparatus by Embodiment 1. FIG.

実施の形態１．
図１は、この発明に係る実施の形態１による路側無線装置の構成を示す図である。図において、路側無線装置は、アンテナ装置１と、発進制御機２と、制御装置２０から構成される。制御装置２０は、アンテナ装置１と発進制御機２に信号ケーブルにより接続されている。アンテナ装置１は再通信アンテナである。路側無線装置は、有料道路の料金所に設置されて、レーン内を走行する車載器２５と通信を行う。発進制御機２は、遮断棒を上下させることにより、レーン内を走行する車両の通行を制止するもしくは車両を通過させる。制御装置２０は、アンテナ装置１の通信情報が入力され、アンテナ装置１および発進制御機２の動作を制御する。制御装置２０は、アンテナ装置１を介して、車載器２５からの初期接続時のデータ（ＡＣＴＣ）の受信信号強度（ＲＳＳＩ）を判定するＡＣＴＣ検定処理を行う。アンテナ装置１は、制御装置２０を介して、操作者によって操作を受ける。 Embodiment 1 FIG.
1 is a diagram showing a configuration of a roadside apparatus according to Embodiment 1 of the present invention. In the figure, the roadside apparatus includes an antenna device 1, a start controller 2, and a control device 20. The control device 20 is connected to the antenna device 1 and the start controller 2 by a signal cable. The antenna device 1 is a re-communication antenna. The roadside apparatus is installed at a toll gate on the toll road and communicates with the vehicle-mounted device 25 traveling in the lane. The start controller 2 stops the passage of the vehicle traveling in the lane or allows the vehicle to pass by moving the blocking bar up and down. The control device 20 receives communication information of the antenna device 1 and controls operations of the antenna device 1 and the start controller 2. The control device 20 performs an ACTC test process for determining the received signal strength (RSSI) of data (ACTC) at the time of initial connection from the vehicle-mounted device 25 via the antenna device 1. The antenna device 1 is operated by an operator via the control device 20.

図１の例では、レーン１１を車両５、車両６が走行し、レーン１２を車両７が走行する。アンテナ装置１は、レーン１１内における発進制御機２の手前の道路上の所定高さに通信領域３を確保する。このためアンテナ装置１は、発進制御機２の真上もしくはやや後方に設置される。アンテナ装置１は、通信領域３内で車両５に搭載された車載器２５と通信を行う。車載器２５は当該通信によりアンテナ装置１にＡＣＴＣ信号として応答１０を返す。アンテナ装置１が車載器２５と通信を行い、通信が正常に行われた場合は、制御装置２０が発進制御機２の遮断棒を上げて、当該車載器２５を搭載した車両５を通過させる。また、アンテナ装置１と車載器２５の通信において異常があった場合は、制御装置２０が発進制御機２の遮断棒を下げて、車両５の通行を制止する。   In the example of FIG. 1, the vehicle 5 and the vehicle 6 travel on the lane 11, and the vehicle 7 travels on the lane 12. The antenna device 1 secures the communication area 3 at a predetermined height on the road in front of the start controller 2 in the lane 11. For this reason, the antenna device 1 is installed directly above or slightly behind the start controller 2. The antenna device 1 communicates with the vehicle-mounted device 25 mounted on the vehicle 5 within the communication area 3. The vehicle-mounted device 25 returns a response 10 as an ACTC signal to the antenna device 1 through the communication. When the antenna device 1 communicates with the vehicle-mounted device 25 and the communication is normally performed, the control device 20 raises the blocking bar of the start controller 2 and passes the vehicle 5 on which the vehicle-mounted device 25 is mounted. In addition, when there is an abnormality in the communication between the antenna device 1 and the vehicle-mounted device 25, the control device 20 lowers the blocking bar of the start controller 2 and stops the vehicle 5 from passing.

アンテナ装置１の前方は、大屋根４がある。このためアンテナ装置１から放射され、通信領域３における路面からの反射波が大屋根４に再度反射する。この再度の反射により、再通信対象車５だけでなく、後続車６や隣接走行車７に電波が届き、不要なＡＣＴＣ信号の応答８、９が返ってくることで誤通信となり得る。   There is a large roof 4 in front of the antenna device 1. For this reason, the reflected wave radiated from the antenna device 1 and reflected from the road surface in the communication area 3 is reflected again on the large roof 4. Due to this re-reflection, the radio wave reaches not only the re-communication target vehicle 5 but also the succeeding vehicle 6 and the adjacent traveling vehicle 7, and unnecessary ACTC signal responses 8 and 9 are returned to cause erroneous communication.

そこでアンテナ装置１のＲＳＳＩ閾値を予め高く設定することで、後続車や隣接車両との通信処理において、応答８、９がＲＳＳＩ閾値を超えることがないようにし、誤通信を防止することができる。しかしながら、この場合は再通信対象となる車両５との通信処理において、車載器２５からのＡＣＴＣ信号の受信信号強度の値（ＲＳＳＩ値）が変動し、その信号強度が低くなったときにＲＳＳＩ閾値を超える応答１０が返ってこない場合がある。このためＲＳＳＩ閾値以上となる連続したＲＳＳＩ値が規定回数を超えにくくなり、通信し辛いという問題が生じる。   Therefore, by setting the RSSI threshold value of the antenna device 1 high in advance, it is possible to prevent the responses 8 and 9 from exceeding the RSSI threshold value and prevent erroneous communication in the communication process with the following vehicle or the adjacent vehicle. However, in this case, in the communication process with the vehicle 5 to be re-communication target, the value of the received signal strength (RSSI value) of the ACTC signal from the vehicle-mounted device 25 fluctuates, and the RSSI threshold value when the signal strength decreases. In some cases, the response 10 exceeding the number does not return. For this reason, the problem that the continuous RSSI value which becomes more than an RSSI threshold value does not easily exceed the specified number of times and communication is difficult occurs.

このため、実施の形態１による制御装置２０は、ＡＣＴＣ信号の受理において、アンテナ装置１を介して、車載器２５との接続許可を行うための判定処理（以下、ＡＣＴＣ検定処理）を、次の（１）から（３）のように行う。ここで、図２は、実施の形態１による路側無線装置の車載器との通信接続を許可するための判定処理を説明するための図である。   For this reason, the control device 20 according to the first embodiment performs the following determination processing (hereinafter referred to as ACTC verification processing) for permitting connection with the vehicle-mounted device 25 via the antenna device 1 in accepting the ACTC signal. Perform as (1) to (3). Here, FIG. 2 is a diagram for explaining a determination process for permitting communication connection with the vehicle-mounted device of the roadside apparatus according to the first embodiment.

（１）初回の通信処理１５において、車載器２５からの応答１０のＲＳＳＩ値が初期設定のＲＳＳＩ閾値１６に対して規程回数を超えられなかった場合、通信失敗となるため、ＲＳＳＩ閾値を一定値下げ、一時的なＲＳＳＩ閾値１７を設定した後、（２）の再通信処理に移行する。
（２）続いて再通信処理となる２回目の通信処理１８において、車載器２５からの応答１０のＲＳＳＩ値が、一次的なＲＳＳＩ閾値１７を、規定回数連続して超えることで、再通信成功となった場合は、ＲＳＳＩ閾値をリセットし、初期設定のＲＳＳＩ閾値１６に戻す。
（３）もし２回目の通信処理１８でもＡＣＴＣ信号の受理の条件を満たすことができなかった場合、一時的なＲＳＳＩ閾値をさらに低く設定し、再通信処理を繰り返す。 (1) In the first communication process 15, if the RSSI value of the response 10 from the vehicle-mounted device 25 does not exceed the prescribed number of times with respect to the initially set RSSI threshold value 16, communication fails, so the RSSI threshold value is lowered by a certain value. After setting the temporary RSSI threshold value 17, the process proceeds to the re-communication process (2).
(2) Successful re-communication when the RSSI value of the response 10 from the vehicle-mounted device 25 exceeds the primary RSSI threshold value 17 continuously for a specified number of times in the second communication process 18 that is the re-communication process. If it becomes, the RSSI threshold value is reset and returned to the initial RSSI threshold value 16.
(3) If the conditions for accepting the ACTC signal cannot be satisfied even in the second communication process 18, the temporary RSSI threshold is set to be lower and the recommunication process is repeated.

一時的なＲＳＳＩ閾値の設定変更は、予め下限値として設定した受信信号強度１９までとする。受信信号強度１９以下となる場合は、ＲＳＳＩ閾値の再変更は行わず、現状のＲＳＳＩ閾値で再通信処理を継続するか、それ以上の再通信処理は行わない。再通信処理を行わない場合は、車両をそのまま退出させるか、もしくはアンテナ装置１を操作する操作者に対して、制御装置２０からアナウンスする。   Temporary RSSI threshold setting changes are made up to the received signal strength 19 set in advance as a lower limit value. When the received signal strength is 19 or less, the RSSI threshold is not re-changed, and the re-communication process is continued with the current RSSI threshold or no further re-communication process is performed. When the re-communication process is not performed, the vehicle is left as it is, or an operator who operates the antenna device 1 is notified from the control device 20.

制御装置２０は、車載器２５からのＡＣＴＣ信号のＡＣＴＣ検定処理において、検出したＲＳＳＩ値が所定のＲＳＳＩ閾値よりも低い時はこのＡＣＴＣを無視し、所定のＲＳＳＩ閾値よりも高い時のみＡＣＴＣを受理する。これにより車載器２５との通信を開始（接続許可）することで、通信エリア外にいる車両の車載器２５との誤通信を防止する。   The control device 20 ignores the ACTC when the detected RSSI value is lower than the predetermined RSSI threshold in the ACTC test processing of the ACTC signal from the vehicle-mounted device 25, and accepts the ACTC only when it is higher than the predetermined RSSI threshold. To do. Thereby, by starting communication (connection permission) with the vehicle-mounted device 25, erroneous communication with the vehicle-mounted device 25 of the vehicle outside the communication area is prevented.

また、制御装置２０は、車載器２５との通信が成立するまでＡＣＴＣ検定処理を繰り返し実行可能である。初回で判定条件を満たせずＡＣＴＣ受理不可となった場合は、車載器２５から返ってきたＲＳＳＩ値を判定し、一時的にＲＳＳＩ閾値をその値以下に変更する。   The control device 20 can repeatedly execute the ACTC verification process until communication with the vehicle-mounted device 25 is established. When the determination condition is not satisfied for the first time and the ACTC is not accepted, the RSSI value returned from the vehicle-mounted device 25 is determined, and the RSSI threshold value is temporarily changed to the value or less.

続いて変更後のＲＳＳＩ閾値で再度通信を行い、通信が成立するか、変更後のＲＳＳＩ閾値が予め下限値として設定した受信信号強度を下回る直前まで、ＲＳＳＩ閾値の下方修正および再通信を繰り返す。通信成立後または通信不成立で車両を退出させた後は、閾値をリセットし、初期設定のＲＳＳＩ閾値に戻す。また、再通信時に複数の応答が有ったことが認識された場合は、最も高いＲＳＳＩ値を採用することで予期せぬ誤通信を避ける。   Subsequently, communication is performed again at the RSSI threshold value after the change, and downward correction and recommunication of the RSSI threshold value are repeated until communication is established or immediately before the RSSI threshold value after the change falls below the received signal strength set as the lower limit value in advance. After communication is established or after the vehicle is exited due to communication failure, the threshold value is reset and returned to the initial RSSI threshold value. Further, when it is recognized that there are a plurality of responses at the time of recommunication, an unexpected erroneous communication is avoided by adopting the highest RSSI value.

以上説明した通り、実施の形態１による路側無線装置は、車載器２５からのＡＣＴＣ信号を、アンテナ装置を介して繰り返し受信し、受信したＡＣＴＣ信号の受信信号強度値を測定し、測定した受信信号強度値が所定の受信信号強度閾値よりも大きくなる回数が所定回数以上であった場合に通信成功と判断するＡＣＴＣ検定処理を行う制御装置であって、上記受信信号強度値が所定の受信信号強度閾値よりも小さい場合に、当該受信信号強度閾値をより小さい値に変更して再びＡＣＴＣ検定処理を行い、上記受信信号強度値が変更後の受信信号強度閾値よりも大きくなるまで変更し、かつ変更後の受信信号強度閾値が規定の下限値よりも小さくなったらＡＣＴＣ検定処理を終了する制御装置を備えたことを特徴とする。これにより、ＡＣＴＣ検定処理の繰り返し回数がより少ない回数で、アンテナ装置の通信エリア外にいる車両の車載器との誤通信を防止することができる。   As described above, the roadside apparatus according to Embodiment 1 repeatedly receives the ACTC signal from the vehicle-mounted device 25 via the antenna device, measures the received signal strength value of the received ACTC signal, and measures the received signal. A control device for performing an ACTC test process for determining that communication is successful when the number of times that the intensity value is greater than a predetermined received signal intensity threshold is equal to or greater than a predetermined number, wherein the received signal intensity value is a predetermined received signal intensity If the received signal strength threshold value is smaller than the threshold value, the received signal strength threshold value is changed to a smaller value, the ACTC test process is performed again, and the received signal strength value is changed until the received signal strength threshold value after the change becomes larger and changed. A control device is provided that terminates the ACTC verification process when the later received signal strength threshold value becomes smaller than a prescribed lower limit value. Thereby, erroneous communication with the vehicle-mounted device of the vehicle outside the communication area of the antenna device can be prevented with a smaller number of repetitions of the ACTC verification process.

１ アンテナ装置、２ 発進制御機、３ 通信領域、５ 車両、６ 車両、７ 車両、１１ レーン、１２ レーン、２０ 制御装置、２５ 車載器。   DESCRIPTION OF SYMBOLS 1 Antenna apparatus, 2 start controller, 3 communication area, 5 vehicle, 6 vehicle, 7 vehicle, 11 lane, 12 lane, 20 control apparatus, 25 onboard equipment.

Claims (1)

車載器からのＡＣＴＣ（Ａｃｔｉｖａｔｉｏｎ Ｃｈａｎｎｅｌ）信号を、アンテナ装置を介して繰り返し受信し、受信したＡＣＴＣ信号の受信信号強度値を測定し、測定した受信信号強度値が所定の受信信号強度閾値よりも大きくなる回数が所定回数以上であった場合に通信成功と判断するＡＣＴＣ検定処理を行う制御装置であって、
上記受信信号強度値が所定の受信信号強度閾値よりも小さい場合に、当該受信信号強度閾値をより小さい値に変更して再びＡＣＴＣ検定処理を行い、上記受信信号強度値が変更後の受信信号強度閾値よりも大きくなるまで変更し、かつ変更後の受信信号強度閾値が規定の下限値よりも小さくなったらＡＣＴＣ検定処理を終了する制御装置、
を備えた路側無線装置。 The ACTC (Activation Channel) signal from the vehicle-mounted device is repeatedly received via the antenna device, the received signal strength value of the received ACTC signal is measured, and the measured received signal strength value is larger than a predetermined received signal strength threshold value. A control device that performs an ACTC verification process that determines that communication is successful when the number of times is greater than or equal to a predetermined number of times,
When the received signal strength value is smaller than a predetermined received signal strength threshold, the received signal strength threshold is changed to a smaller value, and the ACTC test process is performed again, and the received signal strength value is changed. A control device that changes until the threshold value becomes larger than the threshold value, and terminates the ACTC test process when the received signal strength threshold value after the change becomes smaller than a prescribed lower limit value;
A roadside wireless device comprising:
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