JP2017073749A5 - Wireless communication system - Google Patents
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- JP2017073749A5 JP2017073749A5 JP2015201425A JP2015201425A JP2017073749A5 JP 2017073749 A5 JP2017073749 A5 JP 2017073749A5 JP 2015201425 A JP2015201425 A JP 2015201425A JP 2015201425 A JP2015201425 A JP 2015201425A JP 2017073749 A5 JP2017073749 A5 JP 2017073749A5
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- 230000000051 modifying Effects 0.000 claims description 30
- 230000005540 biological transmission Effects 0.000 claims description 25
- 238000001514 detection method Methods 0.000 claims description 11
- 239000000969 carrier Substances 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims 4
- 230000001702 transmitter Effects 0.000 claims 3
- 230000001629 suppression Effects 0.000 description 2
Description
本発明は、この事情に基づいて成されたものであり、その目的とするところは、混信を抑制しつつも、車両用無線通信装置が送信した変調波を受信する装置が用いられている移動体がその変調波を受信してから、車両用無線通信装置が用いられている車両がその移動体に接近するまでの時間が短くなってしまうことを抑制できる無線通信システムを提供することにある。 The present invention has been made based on this situation, and an object of the present invention is to use a device that uses a device that receives a modulated wave transmitted by a vehicle wireless communication device while suppressing interference. body from receiving the modulated wave, to provide a non-line communication system that can prevent the time up to the vehicle radio communication apparatus is used for a vehicle approaches the mobile is shortened It is in.
上記目的を達成するための本発明は、車両で用いられる車両用無線通信装置（２０）と、車両用無線通信装置が用いられている車両とは異なる移動体で用いられ、車両用無線通信装置が送信する変調波を受信する移動体側受信部（３４）を備えた移動体用無線通信装置（３０）とを備えた無線通信システムであって、
車両用無線通信装置は、車両の車速を検出する車速検出部（２１）と、送信データを生成する送信データ生成部（２５、２５Ａ）と、送信データ生成部が生成した送信データを予め設定された高周波帯の搬送波で変調した変調波を、車速検出部が検出した車速が高いほど大きい送信電力で送信する高周波送信部（２６Ｔ）とを備え、
移動体用無線通信装置は、近距離通信信号を逐次送信する近距離送信部（３２）を備え、
車両用無線通信装置は、さらに、近距離送信部が送信する近距離通信信号を受信する近距離受信部（２３）を備え、高周波送信部は、車速検出部が検出した車速が予め設定された低車速判定閾値よりも低く、かつ、近距離受信部が近距離通信信号を受信したことに基づいて、近距離通信信号の通信距離よりも通信距離が長くなるように予め設定された固定電力で変調波を送信する一方、車速検出部が検出した車速が低車速判定閾値よりも低くても、近距離受信部が近距離通信信号を受信していない場合、車速検出部が検出した車速が高いほど大きい送信電力とする制御である車速比例制御を行い、車速比例制御において、車速検出部が検出した車速が低車速判定閾値よりも低い場合の送信電力は、固定電力よりも小さいことを特徴とする。
To achieve the above object, the present invention provides a vehicular radio communication device (20) used in a vehicle and a vehicle different from the vehicle in which the vehicular radio communication device is used. A wireless communication system including a mobile wireless communication device (30) including a mobile receiver (34) for receiving a modulated wave transmitted by
The vehicle wireless communication device is preset with a vehicle speed detecting unit (21) for detecting the vehicle speed of the vehicle, a transmission data generating unit (25, 25A) for generating transmission data, and transmission data generated by the transmission data generating unit. A high frequency transmission unit (26T) that transmits a modulated wave modulated by a carrier wave in a high frequency band with a higher transmission power as the vehicle speed detected by the vehicle speed detection unit increases ,
The mobile wireless communication device includes a short-range transmission unit (32) that sequentially transmits a short-range communication signal,
The vehicular wireless communication apparatus further includes a short-distance receiving unit (23) that receives a short-distance communication signal transmitted from the short-distance transmitting unit, and the high-frequency transmitting unit is preset with the vehicle speed detected by the vehicle speed detecting unit. The fixed power is set in advance so that the communication distance is longer than the communication distance of the short-range communication signal based on the fact that the short-range reception unit receives the short-range communication signal, which is lower than the low vehicle speed determination threshold. While the modulated wave is transmitted, the vehicle speed detected by the vehicle speed detection unit is high when the vehicle speed detected by the vehicle speed detection unit is lower than the low vehicle speed determination threshold but the short-range reception unit does not receive the short-range communication signal. Car speed proportional control, which is control to increase the transmission power as much as possible, is performed, and in the vehicle speed proportional control, the transmission power when the vehicle speed detected by the vehicle speed detection unit is lower than the low vehicle speed determination threshold is smaller than the fixed power. To do.
本発明の無線通信システムでは、車両用無線通信装置は、この車両用無線通信装置が用いられている車両の車速を検出する車速検出部を備え、車速検出部が検出した車速が高いほど大きい送信電力で変調波を送信する。したがって、車速が相対的に高いときには相対的に大きい送信電力で変調波を送信するので、車速が相対的に高いときには、車両から比較的遠くまで変調波が送信されることになる。これにより、車速が相対的に高くても、車両用無線通信装置が送信した変調波を受信する装置が用いられている移動体が変調波を受信してから、車両用無線通信装置が用いられている車両がその移動体に接近するまでの時間が短くなってしまうことを抑制できる。 In the wireless communication system of the present invention , the vehicle wireless communication device includes a vehicle speed detection unit that detects the vehicle speed of the vehicle in which the vehicle wireless communication device is used, and the higher the vehicle speed detected by the vehicle speed detection unit, the higher the transmission. Transmits a modulated wave with power. Therefore, since the modulated wave is transmitted with relatively large transmission power when the vehicle speed is relatively high, the modulated wave is transmitted relatively far from the vehicle when the vehicle speed is relatively high. Thus, even when the vehicle speed is relatively high, the vehicle wireless communication device is used after the mobile body that uses the device that receives the modulated wave transmitted by the vehicle wireless communication device receives the modulated wave. It can be suppressed that the time until the moving vehicle approaches the moving body is shortened.
Claims (4)
前記車両用無線通信装置が用いられている前記車両とは異なる移動体で用いられ、前記車両用無線通信装置が送信する前記変調波を受信する移動体側受信部（３４）を備えた移動体用無線通信装置（３０）とを備えた無線通信システムであって、
前記車両用無線通信装置は、
前記車両の車速を検出する車速検出部（２１）と、
送信データを生成する送信データ生成部（２５、２５Ａ）と、
前記送信データ生成部が生成した前記送信データを予め設定された高周波帯の搬送波で変調した変調波を、前記車速検出部が検出した前記車速が高いほど大きい送信電力で送信する高周波送信部（２６Ｔ）とを備え、
前記移動体用無線通信装置は、近距離通信信号を逐次送信する近距離送信部（３２）を備え、
前記車両用無線通信装置は、さらに、
前記近距離送信部が送信する前記近距離通信信号を受信する近距離受信部（２３）を備え、
前記高周波送信部は、
前記車速検出部が検出した前記車速が予め設定された低車速判定閾値よりも低く、かつ、前記近距離受信部が前記近距離通信信号を受信したことに基づいて、前記近距離通信信号の通信距離よりも通信距離が長くなるように予め設定された固定電力で前記変調波を送信する一方、
前記車速検出部が検出した前記車速が前記低車速判定閾値よりも低くても、前記近距離受信部が前記近距離通信信号を受信していない場合、前記車速検出部が検出した前記車速が高いほど大きい前記送信電力とする制御である車速比例制御を行い、前記車速比例制御において、前記車速検出部が検出した前記車速が前記低車速判定閾値よりも低い場合の前記送信電力は、前記固定電力よりも小さいことを特徴とする無線通信システム。 A vehicular wireless communication device (20) used in the vehicle ;
Used for a moving body different from the vehicle in which the vehicle wireless communication device is used, and provided with a moving body side receiving unit (34) for receiving the modulated wave transmitted by the vehicle wireless communication device. A wireless communication system comprising a wireless communication device (30),
The vehicle wireless communication device is:
A vehicle speed detector (21) for detecting the vehicle speed of the vehicle;
A transmission data generation unit (25, 25A) for generating transmission data;
A high-frequency transmission unit (26T) that transmits a modulated wave obtained by modulating the transmission data generated by the transmission data generation unit with a carrier wave in a preset high-frequency band with higher transmission power as the vehicle speed detected by the vehicle speed detection unit is higher. ) and equipped with a,
The mobile wireless communication device includes a short-range transmission unit (32) that sequentially transmits a short-range communication signal,
The vehicle wireless communication device further includes:
A short-range receiver (23) for receiving the short-range communication signal transmitted by the short-range transmitter;
The high-frequency transmitter is
Communication of the near field communication signal based on the vehicle speed detected by the vehicle speed detecting unit being lower than a preset low vehicle speed determination threshold and the near field receiving unit receiving the near field communication signal. While transmitting the modulated wave at a fixed power set in advance so that the communication distance is longer than the distance,
Even if the vehicle speed detected by the vehicle speed detection unit is lower than the low vehicle speed determination threshold, the vehicle speed detected by the vehicle speed detection unit is high when the short-range reception unit has not received the short-range communication signal. Vehicle speed proportional control, which is control for increasing the transmission power as much as possible, is performed, and in the vehicle speed proportional control, the transmission power when the vehicle speed detected by the vehicle speed detection unit is lower than the low vehicle speed determination threshold is the fixed power A wireless communication system characterized by being smaller.
前記車両用無線通信装置は、
前記高周波送信部が使用する前記高周波帯の電波を受信する高周波受信部（２６Ｒ）と、
前記高周波受信部により前記高周波帯の電波を受信してキャリアセンスを行うキャリアセンス部（２８）とを備え、
前記高周波送信部は、前記車速比例制御を行う場合、前記キャリアセンス部により前記キャリアセンスを実行させて、前記高周波帯のチャネルが空いていると判定した後に前記変調波を送信するが、前記固定電力で前記変調波を送信する場合、前記キャリアセンス部に前記キャリアセンスを実行させることなく前記変調波を送信することを特徴とする無線通信システム。 In claim 1 ,
The vehicle wireless communication device is:
A high frequency receiver (26R) for receiving radio waves in the high frequency band used by the high frequency transmitter;
A carrier sense unit (28) for performing carrier sense by receiving radio waves in the high frequency band by the high frequency receiving unit;
When performing the vehicle speed proportional control, the high-frequency transmission unit transmits the modulated wave after determining that the channel of the high-frequency band is free by causing the carrier sense unit to execute the carrier sense, When transmitting the modulated wave with electric power, the modulated wave is transmitted without causing the carrier sense unit to execute the carrier sense.
前記車両は、ダイナモ（２ａ）を備える自転車（２）であり、
前記車両用無線通信装置の前記車速検出部（２１）は、前記ダイナモの出力電圧を用いて前記車速を検出するものであって、前記車速に応じて高くなる電圧を、前記車速を表す車速信号として出力するものであり、
前記車両用無線通信装置の前記高周波送信部（２６Ｔ）は、
前記送信データ生成部が生成した前記送信データを変調および増幅して、前記変調波を表す信号を出力する変調増幅部（２６Ｔ１、２６Ｔ２）と、
前記変調増幅部が出力した前記変調波を表す信号を入力信号として、前記車速信号の電圧が高いほど低い減衰率で前記入力信号を減衰させた信号を出力する電圧制御減衰部（２６３１）と、
前記変調増幅部が出力した前記変調波を表す信号を前記固定電力で出力する固定電力部（２６３２）と、
前記固定電力で前記変調波を送信する場合には、前記変調増幅部が出力した前記変調波を表す信号を前記固定電力部に入力する一方、前記車速比例制御を実行する場合には、前記変調増幅部が出力した前記変調波を表す信号を前記電圧制御減衰部に入力する切替部（２６３３、２６３４）とを備えることを特徴とする無線通信システム。 In claim 1 or 2 ,
The vehicle is a bicycle (2) provided with a dynamo (2a),
The vehicle speed detection unit (21) of the vehicular wireless communication device detects the vehicle speed using the output voltage of the dynamo, and uses a vehicle speed signal representing the vehicle speed as a voltage that increases according to the vehicle speed. Output as
The high-frequency transmission unit (26T) of the vehicle wireless communication device is
A modulation amplification unit (26T1, 26T2) that modulates and amplifies the transmission data generated by the transmission data generation unit and outputs a signal representing the modulated wave;
A voltage control attenuation unit (2631) that outputs a signal obtained by attenuating the input signal at a lower attenuation rate as the voltage of the vehicle speed signal is higher as a signal representing the modulated wave output from the modulation amplification unit;
A fixed power unit (2632) for outputting a signal representing the modulated wave output by the modulation amplification unit at the fixed power;
When transmitting the modulated wave with the fixed power, a signal representing the modulated wave output from the modulation amplifier is input to the fixed power unit, while when performing the vehicle speed proportional control, the modulation is performed. A wireless communication system, comprising: a switching unit (2633, 2634) that inputs a signal representing the modulated wave output from the amplification unit to the voltage control attenuation unit.
前記近距離送信部および前記近距離受信部は、ＬＦ帯の電波で前記近距離通信信号を送受信することを特徴とする無線通信システム。 In any one of claims 1 to 3,
The short-range transmission unit and the short-distance reception unit transmit and receive the short-range communication signal using an LF band radio wave.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015201425A JP6365496B2 (en) | 2015-10-09 | 2015-10-09 | Wireless communication system |
| PCT/JP2016/075935 WO2017061205A1 (en) | 2015-10-09 | 2016-09-05 | Vehicular wireless communication device and wireless communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015201425A JP6365496B2 (en) | 2015-10-09 | 2015-10-09 | Wireless communication system |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2017073749A JP2017073749A (en) | 2017-04-13 |
| JP2017073749A5 true JP2017073749A5 (en) | 2017-10-19 |
| JP6365496B2 JP6365496B2 (en) | 2018-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2015201425A Expired - Fee Related JP6365496B2 (en) | 2015-10-09 | 2015-10-09 | Wireless communication system |
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| JP (1) | JP6365496B2 (en) |
| WO (1) | WO2017061205A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10940909B2 (en) * | 2018-02-09 | 2021-03-09 | Shimano Inc. | Wireless receiving device for human powered vehicle |
| JP7345118B2 (en) * | 2021-12-24 | 2023-09-15 | パナソニックＩｐマネジメント株式会社 | Communication device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3885105B2 (en) * | 2000-05-22 | 2007-02-21 | 洋一 佐藤 | Logistics management method |
| JP4096809B2 (en) * | 2003-05-16 | 2008-06-04 | 株式会社デンソー | Inter-automobile wireless communication device |
| JP6037194B2 (en) * | 2011-06-10 | 2016-12-07 | パナソニックＩｐマネジメント株式会社 | On-board device, mobile terminal device |
| JP2013171445A (en) * | 2012-02-21 | 2013-09-02 | Kato Electrical Mach Co Ltd | Traffic safety system |
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- 2015-10-09 JP JP2015201425A patent/JP6365496B2/en not_active Expired - Fee Related
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- 2016-09-05 WO PCT/JP2016/075935 patent/WO2017061205A1/en active Application Filing
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