WO2023242916A1 - Wireless communication system, wireless communication method, and wireless communication terminal - Google Patents

Wireless communication system, wireless communication method, and wireless communication terminal Download PDF

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WO2023242916A1
WO2023242916A1 PCT/JP2022/023665 JP2022023665W WO2023242916A1 WO 2023242916 A1 WO2023242916 A1 WO 2023242916A1 JP 2022023665 W JP2022023665 W JP 2022023665W WO 2023242916 A1 WO2023242916 A1 WO 2023242916A1
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wireless communication
channel
communication terminal
result information
unit
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PCT/JP2022/023665
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French (fr)
Japanese (ja)
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笑子 篠原
裕介 淺井
芳孝 清水
純一 岩谷
知之 山田
泰司 鷹取
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日本電信電話株式会社
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Priority to PCT/JP2022/023665 priority Critical patent/WO2023242916A1/en
Publication of WO2023242916A1 publication Critical patent/WO2023242916A1/en

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  • the present invention relates to a wireless communication system, a wireless communication method, and a wireless communication terminal.
  • IoT Internet of Things
  • the total transmission time rate (limitation on the total transmission time per hour) is 10%, and the amount of data that can be transmitted by one terminal is significantly greater than the actual performance of the radio. It may end up being too little.
  • the limit on the total transmission time rate is a regulation for the shared band between active tags (wireless communication terminals such as sensor communication systems that transmit and receive by sensing carriers before transmitting to each other).
  • active tags wireless communication terminals such as sensor communication systems that transmit and receive by sensing carriers before transmitting to each other.
  • passive tags electronic tag-based wireless communication terminals such as RFID that return responses to transmitted radio waves, rather than communications that spontaneously emit radio waves.
  • the carrier sense time before transmission is specified to be 5 msec or more, which is significantly longer than the carrier sense time (128 ⁇ sec or more) in the active tag shared band.
  • the passive tag priority band requires a pause time of 50 msec (time for stopping transmission of signals other than response signals such as ACK) after emitting radio waves (see Non-Patent Document 2).
  • a pause time of 50 msec (time for stopping transmission of signals other than response signals such as ACK) after emitting radio waves (see Non-Patent Document 2).
  • the passive tag priority band once carrier sensing is performed for 5 msec or more, it is limited to within 4 sec after the first radio wave is emitted, and there is no pause time, and the carrier sense time is also 128 ⁇ sec.
  • peripheral terminals will have to wait longer even if they attempt to transmit all at once.
  • the present invention has been made in view of the above-mentioned problems, and aims to provide a wireless communication system, a wireless communication method, and a wireless communication terminal that can confirm the availability of a frequency band in a short time. .
  • a wireless communication system has a first channel in which a total transmission time rate is limited, a pause time in which transmission of signals other than a response signal is stopped, and a carrier sense time before transmission, which is different from the first channel.
  • a wireless communication terminal that is capable of wireless communication using a second channel that is defined for a long time and has no limit on the total transmission time rate; and a control device that controls the wireless communication terminal, the control device , a collection unit that collects observation result information indicating the results of observing the usage status of the second channel by devices that are not using the second channel around the wireless communication terminal; and observation results collected by the collection unit.
  • a determination unit that determines whether or not the wireless communication terminal can use the second channel based on the information; and determination result information indicating the determination result of the determination unit in response to a request from the wireless communication terminal. and a result transmitting unit that transmits the determination result information, and the wireless communication terminal includes a request transmitting unit that requests the control device to transmit determination result information by the result transmitting unit, and a result receiving unit that receives information; and controlling the wireless communication terminal to use the second channel when the determination result information received by the result receiving unit indicates that the second channel can be used.
  • the invention is characterized in that it has a control section.
  • the first channel has a limit on the total transmission time rate, the pause time for stopping transmission of signals other than response signals, and the carrier sense time before transmission for the first channel.
  • a wireless communication system comprising: a wireless communication terminal capable of wireless communication using a second channel that is defined to be longer than the channel and has no limit on the total transmission time rate; and a control device that controls the wireless communication terminal.
  • a wireless communication method carried out by a wireless communication terminal comprising: a collection step of collecting observation result information indicating a result of observing the usage status of the second channel by devices that are not using the second channel around the wireless communication terminal; a determination step of determining whether or not the wireless communication terminal can use the second channel based on observation result information; and determination result information indicating the determined result indicating that the second channel can be used.
  • the wireless communication terminal is characterized by including a control step of controlling the wireless communication terminal to use the second channel.
  • the wireless communication terminal has a first channel in which the total transmission time rate is limited, a pause time in which transmission of signals other than response signals is stopped, and a carrier sense time before transmission in the first channel.
  • the second channel is used to transmit data frames.
  • an observation unit that observes the usage status of the second channel when the second channel is not being used; and a result of determining whether or not the second channel can be used based on the usage status of the second channel observed by the observation unit.
  • a request transmitting unit that requests the control device to transmit determination result information indicating the determination result information
  • a result receiving unit that receives the determination result information transmitted by the control device in response to a request from the request transmitting unit
  • a control unit that controls the radio communication terminal to use the second channel when the determination result information received by the unit indicates that the second channel can be used.
  • FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to an embodiment. It is a diagram showing an example of the configuration of a base station.
  • FIG. 3 is a diagram showing combinations of transmission time limit parameters in each frequency band of the 920 MHz band.
  • FIG. 3 is a diagram showing channels and center frequencies of a passive tag priority band in the 920 MHz band.
  • FIG. 2 is a functional block diagram illustrating functions of a control device.
  • FIG. 2 is a functional block diagram illustrating functions of a base station (wireless communication terminal).
  • FIG. 3 is a diagram illustrating timing at which a wireless communication device according to an embodiment transmits a transmission frame in a passive tag priority band.
  • 1 is a flowchart illustrating an example of the operation of a wireless communication system according to an embodiment.
  • FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to an embodiment.
  • the wireless communication system includes, for example, a base station 1 that is a wireless communication terminal, a transmitting terminal 2, a control device 3, and a plurality of wireless terminals 4.
  • the base station 1 receives the transmission frame transmitted by the transmitting terminal 2 under the control of the control device 3.
  • the wireless terminal 4 has a function of observing (scanning) the radio wave condition (frequency condition) around the control device 3 and transmits the observation result to the control device 3.
  • the wireless terminal 4 performs a scan in which carrier sensing is performed continuously or fragmentarily for 5 msec or more, for example. Furthermore, the wireless terminal 4 may record the number of times a channel is determined to be busy, or may use a simple spectrum analyzer to detect and record the presence or absence of a signal in the relevant time period. For example, if a scan is performed 100 times every minute and the scan result does not show busy even once, it may be determined that the passive tag priority band is not used in that location or time period.
  • the wireless communication terminals (base station 1 and transmitting terminal 2) that wish to use the passive tag priority band make an inquiry to the control device 3.
  • the control device 3 determines whether or not the passive tag priority band should be used based on the collected information, and replies to the wireless communication terminal that inquired about the result.
  • control device 3 may record the collected data together with the position information and save it as a database. In this case, the control device 3 can notify the base station 1 of the usage status of the passive tag priority band without the wireless terminal 4 scanning each time.
  • the transmitting terminal 2 may have the functions of the control device 3. Furthermore, the base station 1 and the transmitting terminal 2 may be wireless communication terminals each having the same functions.
  • FIG. 2 is a diagram showing an example of the configuration of the base station 1.
  • the base station 1 includes, for example, a memory 10, a drive 11, a timer 12, a user interface 13, a wired communication module 14, a first wireless communication module 15-1, a second wireless communication module 15-2, and A control circuit 16 is connected via a bus 17.
  • the memory 10 is a storage device that stores, for example, a control program 100 and management information 102.
  • the drive 11 reads data from or writes data to the storage medium 110 .
  • the timer 12 measures time when the base station 1 performs control.
  • the user interface 13 is an input/output device including, for example, a keyboard and a display.
  • the wired communication module 14 is a module that performs wired communication with other devices.
  • the first wireless communication module 15-1 and the second wireless communication module 15-2 each have a different NIC, and are modules that perform wireless communication with other devices using different channels.
  • the first wireless communication module 15-1 performs wireless communication using, for example, the passive tag priority band (see FIG. 2). Further, the second wireless communication module 15-2 performs wireless communication using, for example, the active tag common band (see FIG. 2). Note that the number of wireless communication modules included in the base station 1 is not limited to two.
  • the control circuit 16 includes a CPU 160 and controls each part that constitutes the base station 1. For example, the control circuit 16 performs control using the time measured by the timer 12.
  • FIG. 3 is a diagram showing combinations of transmission time limit parameters in each frequency band of the 920 MHz band.
  • FIG. 4 is a diagram showing channels and center frequencies of the passive tag priority band in the 920 MHz band.
  • A) shown in FIG. 3 shows the parameters of the passive tag priority band.
  • B) shown in FIG. 3 shows the parameters of the active tag shared band.
  • a passive tag priority band is a channel with no limit on the total transmission time rate.
  • a long carrier sense time is defined and a pause time is provided so that the passive tag operation is not hindered by active tag transmission.
  • the carrier sense time before transmission is defined as 5 msec or more
  • the pause time for stopping transmission of anything other than a response signal is defined as 50 msec or more after emitting radio waves.
  • the passive tag priority band does not require a pause time only within 4 seconds after the first radio wave is emitted after carrying out carrier sense for 5 msec or more, and the carrier sense time is also specified as 128 ⁇ sec. .
  • the active tag shared band is a channel with a limit on the total transmission time rate. Specifically, in the active tag shared band, the total transmission time rate is defined as 10% or less, and the carrier sense time before transmission is defined as 128 ⁇ sec. In other words, in the active tag priority band, the total transmission time per hour is limited to 360 seconds, so large-capacity communication may be difficult.
  • FIG. 5 is a functional block diagram illustrating the functions that the control device 3 has. As shown in FIG. 5, the control device 3 includes a receiving section 30, a collecting section 31, a storage section 32, a determining section 33, a result transmitting section 34, and a controlling section 35.
  • the receiving unit 30 receives information transmitted by the base station 1 and the wireless terminal 4, and outputs the received information to the collecting unit 31.
  • the collection unit 31 collects the information received by the reception unit 30 and outputs it to the storage unit 32. For example, the collection unit 31 collects observation results indicating the usage status of channels in the passive tag priority band by wireless terminals 4 that are not using channels in the passive tag priority band around the base station (wireless communication terminal) 1. Information is collected and output to the storage unit 32.
  • the collection unit 31 collects observation result information indicating the result of observing the usage status of the channel in the passive tag priority band, and also collects information about the channel usage status of the passive tag priority band when the wireless terminal 4 or the like that does not use the channel in the passive tag priority band uses the channel in the passive tag priority band.
  • Location information (and time information) indicating the location (and time) at which usage status was observed is collected and output to the storage unit 32.
  • the storage unit 32 stores information such as observation result information collected by the collection unit 31 and results determined by the determination unit 33.
  • the storage unit 32 stores both observation result information and position information collected by the collection unit 31.
  • the determining unit 33 determines whether the base station 1 and the transmitting terminal 2 can use the channel of the passive tag priority band based on the observation result information collected by the collecting unit 31, and stores the determination result in the storage unit 32. Output. Further, when the collection unit 31 has not newly collected observation result information, the determination unit 33 determines that the base station 1 and the transmitting terminal 2 give priority to passive tags based on the observation result information stored in the storage unit 32. Determine whether or not the channel of the band can be used.
  • the determination unit 33 determines whether or not the base station 1 and the transmitting terminal 2 can use the channel of the passive tag priority band based on the observation result information and position information stored in the storage unit 32. good.
  • the result transmitting unit 34 transmits determination result information indicating the result determined by the determining unit 33 in response to a request from the base station 1.
  • the control unit 35 controls each unit making up the control device 3.
  • FIG. 6 is a functional block diagram illustrating functions that the base station (wireless communication terminal) 1 has.
  • the base station 1 includes, for example, a request transmitting section 60, a result receiving section 61, a storage section 62, and a control section 63.
  • the transmitting terminal 2 may include each function of the base station 1 shown in FIG. 6, and may further include an observation unit 64 so as to function similarly to the wireless terminal 4.
  • the request transmitter 60 requests the control device 3 to transmit the determination result information by the result transmitter 34 of the control device 3.
  • the result receiving unit 61 receives the determination result information transmitted by the result transmitting unit 34 of the control device 3 and outputs it to the storage unit 62.
  • the storage unit 62 stores information received by the result receiving unit 61.
  • the control unit 63 controls each unit configuring the base station 1 (same as the transmitting terminal 2). For example, when the determination result information received by the result receiving unit 61 indicates that the channel of the passive tag priority band can be used, the control unit 63 controls whether the base station 1 (same as the transmitting terminal 2) has the passive tag priority band. Control the use of channels in the band.
  • the observation unit 64 observes the usage status of the surrounding channels in the passive tag priority band when the channel in the passive tag priority band is not used for data frame transmission, and outputs the observation results to the control unit 63 etc. do.
  • the base station 1 (same as the transmitting terminal 2) makes a determination indicating the result of determining whether or not the channel of the passive tag priority band can be used based on the usage status observed by the observation unit 64 by the request transmission unit 60.
  • a request is made to the control device 3 to send the result information.
  • FIG. 7 is a diagram showing the timing at which the base station 1 according to one embodiment transmits a transmission frame in the passive tag priority band.
  • IEEE 802.11ah is one of the wireless communication standards used in sub1GHz. In IEEE 802.11ah, the time length of a wireless communication frame is 28 msec.
  • the transmission time limit is 4 seconds or less, if multiple wireless communication devices and traffic are mixed, the delay time of the traffic of each wireless communication device may become long if there are many. Further, necessary upstream and downstream communications are also transmitted alternately between data frame communications such as TCP ACK.
  • FIG. 8 is a flowchart illustrating an example of the operation of the wireless communication system according to one embodiment.
  • the base station 1 executes carrier sense for 5 msec or more 100 times and counts the number of times it becomes busy (S100).
  • the control device 3 determines whether a specified busy rate (for example, 20 times or more out of 100 times) is observed (S102). When the control device 3 determines that a busy state with a specified busy rate is observed (S102: Yes), the control device 3 proceeds to the process of S106, and when it determines that a busy state with a specified busy rate is not observed (S102: No). The process proceeds to S104.
  • a specified busy rate for example, 20 times or more out of 100 times
  • step 104 the control device 3 determines that the base station 1 and the transmitting terminal 2 can use the passive tag priority band.
  • step 106 the control device 3 determines that the base station 1 and the transmitting terminal 2 are unable to use the passive tag priority band.
  • the wireless communication system determines whether the base station 1 and the transmitting terminal 2 can use the channel of the passive tag priority band based on the observation result information collected by the collecting unit 31. Therefore, the availability of the frequency band can be confirmed in a short time.
  • the wireless communication system may perform a threshold determination based on the observation result information collected by the collection unit 31, and determine that the passive tag priority band is available after the threshold.
  • the occupied time rate of the signal observed with a simple spectrum analyzer is equal to or higher than a predetermined value (eg, 20%), it may be determined that the passive tag priority band cannot be used. Furthermore, if the carrier sense busy rate exceeds a predetermined value (eg, 20%), it may be determined that the passive tag priority band cannot be used.
  • control device 3 may determine whether or not a frequency channel can be used, based on the position information of the wireless terminal 4, using the determination result of a range determined to be affected (for example, within several hundred meters). .
  • each function of the base station 1, transmitting terminal 2, control device 3, and wireless terminal 4 is partially or entirely implemented by hardware such as a PLD (Programmable Logic Device) or an FPGA (Field Programmable Gate Array).
  • the program may be configured as a program executed by a processor such as a CPU.
  • each of the base station 1, transmitting terminal 2, control device 3, and wireless terminal 4 can be realized using a computer and a program, and the program can be recorded on a storage medium or provided through a network. It is.

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Abstract

The wireless communication system according to an embodiment is characterized in that: a control device includes a collection unit that collects observation result information indicating a result of observation of a use situation of a channel, the observation being carried out by a device not using the channel in the vicinity of a wireless communication terminal; a determination unit that determines, on the basis of the observation result information collected by the collection unit, whether the wireless communication terminal can use the channel; and a result transmission unit that transmits determination result information indicating the result determined by the determination unit in response to a request from the wireless communication terminal and the wireless communication terminal includes a control unit that controls the wireless communication terminal to use the channel when the received determination result information indicates that the channel can be used.

Description

無線通信システム、無線通信方法及び無線通信端末Wireless communication system, wireless communication method, and wireless communication terminal
　本発明は、無線通信システム、無線通信方法及び無線通信端末に関する。 The present invention relates to a wireless communication system, a wireless communication method, and a wireless communication terminal.
　ＩｏＴ（Internet of Things）無線通信の発展に伴い、広域な無線エリアから、センサデータだけではなく、画像データや大容量のデータ伝送を求められる場合がある。例えば、９２０ＭＨｚ帯は、広帯域化による伝送容量の拡大を国内法令改正により進められている。 With the development of IoT (Internet of Things) wireless communication, there are cases where it is required to transmit not only sensor data but also image data and large amounts of data from a wide wireless area. For example, in the 920 MHz band, the transmission capacity is being expanded by widening the band due to revisions to domestic laws and regulations.
　しかし、当該９２０ＭＨｚ帯は、総送信時間率（１時間当たりの送信時間の総和の制限）が１０％であるなど、１台の端末が送信できるデータ量が実際の無線機の性能よりも大幅に少ないものとなってしまうことがある。 However, in the 920MHz band, the total transmission time rate (limitation on the total transmission time per hour) is 10%, and the amount of data that can be transmitted by one terminal is significantly greater than the actual performance of the radio. It may end up being too little.
　ただし、総送信時間率の制限は、アクティブタグ（互いに送信前にキャリアセンスして送受信を行うセンサ通信系などの無線通信端末）同士の共有帯域での規定である。パッシブタグ（自発的に電波を発射する通信ではなく、送信された電波に対する応答を返すＲＦＩＤなどの電子タグ系の無線通信端末）の優先帯域には、総送信時間率の制限はない。 However, the limit on the total transmission time rate is a regulation for the shared band between active tags (wireless communication terminals such as sensor communication systems that transmit and receive by sensing carriers before transmitting to each other). There is no limit on the total transmission time rate in the priority band of passive tags (electronic tag-based wireless communication terminals such as RFID that return responses to transmitted radio waves, rather than communications that spontaneously emit radio waves).
　パッシブタグ優先帯域は、総送信時間率の制限はないものの、送信前のキャリアセンス時間が５ｍｓｅｃ以上と規定されており、アクティブタグ共用帯域のキャリアセンス時間（１２８μｓｅｃ以上）よりも大幅に長い。 Although there is no limit on the total transmission time rate in the passive tag priority band, the carrier sense time before transmission is specified to be 5 msec or more, which is significantly longer than the carrier sense time (128 μsec or more) in the active tag shared band.
　さらに、パッシブタグ優先帯域は、電波を発射してから５０ｍｓｅｃの休止時間（ＡＣＫなどの応答信号以外の送信を停止する時間）が必要である（非特許文献２参照）。ただし、パッシブタグ優先帯域は、いったん５ｍｓｅｃ以上のキャリアセンスを行った後は、最初に電波を発射してから４ｓｅｃ以内に限り、休止時間はなくキャリアセンス時間も１２８μｓｅｃとなる。 Furthermore, the passive tag priority band requires a pause time of 50 msec (time for stopping transmission of signals other than response signals such as ACK) after emitting radio waves (see Non-Patent Document 2). However, in the passive tag priority band, once carrier sensing is performed for 5 msec or more, it is limited to within 4 sec after the first radio wave is emitted, and there is no pause time, and the carrier sense time is also 128 μsec.
　また、パッシブタグ優先帯域では、ビーコンフレームのように単フレームが定期的に発生して送信を試みようとする場合、まとめて送信しようとしても周辺端末の待ち時間が長くなってしまう。 Furthermore, in the passive tag priority band, if a single frame such as a beacon frame is periodically generated and attempted to be transmitted, peripheral terminals will have to wait longer even if they attempt to transmit all at once.
　本発明は、上述した課題を鑑みてなされたものであり、周波数帯の利用の可否を短時間で確認することができる無線通信システム、無線通信方法及び無線通信端末を提供することを目的とする。 The present invention has been made in view of the above-mentioned problems, and aims to provide a wireless communication system, a wireless communication method, and a wireless communication terminal that can confirm the availability of a frequency band in a short time. .
　本発明の一実施形態にかかる無線通信システムは、総送信時間率に制限がある第１チャネルと、応答信号以外の送信を停止する休止時間、及び送信前のキャリアセンス時間を前記第１チャネルよりも長く規定されて総送信時間率に制限がない第２チャネルとを使用して無線通信を可能にされた無線通信端末と、前記無線通信端末を制御する制御装置とを備え、前記制御装置は、前記無線通信端末の周囲で前記第２チャネルを使用していない装置が前記第２チャネルの利用状況を観測した結果を示す観測結果情報を収集する収集部と、前記収集部が収集した観測結果情報に基づいて、前記無線通信端末が前記第２チャネルを利用することの可否を判定する判定部と、前記判定部が判定した結果を示す判定結果情報を、前記無線通信端末からの要求に応じて送信する結果送信部とを有し、前記無線通信端末は、前記結果送信部による判定結果情報の送信を前記制御装置に対して要求する要求送信部と、前記結果送信部が送信した判定結果情報を受信する結果受信部と、前記結果受信部が受信した判定結果情報が前記第２チャネルを利用可であることを示す場合に、当該無線通信端末が前記第２チャネルを利用するように制御する制御部とを有することを特徴とする。 A wireless communication system according to an embodiment of the present invention has a first channel in which a total transmission time rate is limited, a pause time in which transmission of signals other than a response signal is stopped, and a carrier sense time before transmission, which is different from the first channel. a wireless communication terminal that is capable of wireless communication using a second channel that is defined for a long time and has no limit on the total transmission time rate; and a control device that controls the wireless communication terminal, the control device , a collection unit that collects observation result information indicating the results of observing the usage status of the second channel by devices that are not using the second channel around the wireless communication terminal; and observation results collected by the collection unit. a determination unit that determines whether or not the wireless communication terminal can use the second channel based on the information; and determination result information indicating the determination result of the determination unit in response to a request from the wireless communication terminal. and a result transmitting unit that transmits the determination result information, and the wireless communication terminal includes a request transmitting unit that requests the control device to transmit determination result information by the result transmitting unit, and a result receiving unit that receives information; and controlling the wireless communication terminal to use the second channel when the determination result information received by the result receiving unit indicates that the second channel can be used. The invention is characterized in that it has a control section.
　また、本発明の一実施形態にかかる無線通信方法は、総送信時間率に制限がある第１チャネルと、応答信号以外の送信を停止する休止時間、及び送信前のキャリアセンス時間を前記第１チャネルよりも長く規定されて総送信時間率に制限がない第２チャネルとを使用して無線通信を可能にされた無線通信端末と、前記無線通信端末を制御する制御装置とを備える無線通信システムが行う無線通信方法において、前記無線通信端末の周囲で前記第２チャネルを使用していない装置が前記第２チャネルの利用状況を観測した結果を示す観測結果情報を収集する収集工程と、収集した観測結果情報に基づいて、前記無線通信端末が前記第２チャネルを利用することの可否を判定する判定工程と、判定した結果を示す判定結果情報が前記第２チャネルを利用可であることを示す場合に、前記無線通信端末が前記第２チャネルを利用するように制御する制御工程とを含むことを特徴とする。 Further, in the wireless communication method according to an embodiment of the present invention, the first channel has a limit on the total transmission time rate, the pause time for stopping transmission of signals other than response signals, and the carrier sense time before transmission for the first channel. A wireless communication system comprising: a wireless communication terminal capable of wireless communication using a second channel that is defined to be longer than the channel and has no limit on the total transmission time rate; and a control device that controls the wireless communication terminal. A wireless communication method carried out by a wireless communication terminal, comprising: a collection step of collecting observation result information indicating a result of observing the usage status of the second channel by devices that are not using the second channel around the wireless communication terminal; a determination step of determining whether or not the wireless communication terminal can use the second channel based on observation result information; and determination result information indicating the determined result indicating that the second channel can be used. In this case, the wireless communication terminal is characterized by including a control step of controlling the wireless communication terminal to use the second channel.
　また、本発明の一実施形態にかかる無線通信端末は、総送信時間率に制限がある第１チャネルと、応答信号以外の送信を停止する休止時間、及び送信前のキャリアセンス時間を前記第１チャネルよりも長く規定されて総送信時間率に制限がない第２チャネルとを使用し、制御装置の制御に応じて無線通信を行う無線通信端末において、前記第２チャネルをデータフレームの送信に使用していないときに、前記第２チャネルの利用状況を観測する観測部と、前記観測部が観測した記第２チャネルの利用状況に基づいて前記第２チャネルを利用することの可否を判定した結果を示す判定結果情報の送信を前記制御装置に対して要求する要求送信部と、前記要求送信部の要求に応じて前記制御装置が送信した判定結果情報を受信する結果受信部と、前記結果受信部が受信した判定結果情報が前記第２チャネルを利用可であることを示す場合に、当該無線通信端末が前記第２チャネルを利用するように制御する制御部とを有することを特徴とする。 Further, the wireless communication terminal according to an embodiment of the present invention has a first channel in which the total transmission time rate is limited, a pause time in which transmission of signals other than response signals is stopped, and a carrier sense time before transmission in the first channel. In a wireless communication terminal that performs wireless communication under the control of a control device using a second channel that is defined to be longer than the channel and has no limit on the total transmission time rate, the second channel is used to transmit data frames. an observation unit that observes the usage status of the second channel when the second channel is not being used; and a result of determining whether or not the second channel can be used based on the usage status of the second channel observed by the observation unit. a request transmitting unit that requests the control device to transmit determination result information indicating the determination result information; a result receiving unit that receives the determination result information transmitted by the control device in response to a request from the request transmitting unit; and a control unit that controls the radio communication terminal to use the second channel when the determination result information received by the unit indicates that the second channel can be used.
　本発明によれば、周波数帯の利用の可否を短時間で確認することができる。 According to the present invention, it is possible to confirm whether or not a frequency band can be used in a short time.
一実施形態にかかる無線通信システムの構成例を示す図である。1 is a diagram illustrating a configuration example of a wireless communication system according to an embodiment. 基地局の構成例を示す図である。It is a diagram showing an example of the configuration of a base station. ９２０ＭＨｚ帯の各周波数帯における送信時間制限のパラメータの組み合わせを示す図である。FIG. 3 is a diagram showing combinations of transmission time limit parameters in each frequency band of the 920 MHz band. ９２０ＭＨｚ帯におけるパッシブタグ優先帯域のチャネルと中心周波数を示す図である。FIG. 3 is a diagram showing channels and center frequencies of a passive tag priority band in the 920 MHz band. 制御装置が有する機能を例示する機能ブロック図である。FIG. 2 is a functional block diagram illustrating functions of a control device. 基地局（無線通信端末）が有する機能を例示する機能ブロック図である。FIG. 2 is a functional block diagram illustrating functions of a base station (wireless communication terminal). 一実施形態にかかる無線通信装置がパッシブタグ優先帯域で送信フレームを送信するタイミングを示す図である。FIG. 3 is a diagram illustrating timing at which a wireless communication device according to an embodiment transmits a transmission frame in a passive tag priority band. 一実施形態にかかる無線通信システムの動作例を示すフローチャートである。1 is a flowchart illustrating an example of the operation of a wireless communication system according to an embodiment.
　以下に、図面を用いて一実施形態にかかる無線通信システムについて説明する。図１は、一実施形態にかかる無線通信システムの構成例を示す図である。図１に示すように、一実施形態にかかる無線通信システムは、例えば無線通信端末である基地局１、送信端末２、制御装置３、及び複数の無線端末４を有する。 A wireless communication system according to an embodiment will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to an embodiment. As shown in FIG. 1, the wireless communication system according to one embodiment includes, for example, a base station 1 that is a wireless communication terminal, a transmitting terminal 2, a control device 3, and a plurality of wireless terminals 4.
　基地局１は、送信端末２が送信する送信フレームを制御装置３の制御に応じて受信する。無線端末４は、制御装置３の周囲の電波状況（周波数状況）を観測（スキャン）する機能を備え、観測結果を制御装置３に対して送信する。 The base station 1 receives the transmission frame transmitted by the transmitting terminal 2 under the control of the control device 3. The wireless terminal 4 has a function of observing (scanning) the radio wave condition (frequency condition) around the control device 3 and transmits the observation result to the control device 3.
　無線端末４は、例えば５ｍｓｅｃ以上のキャリアセンスを連続的又は断片的に実行するスキャンを行う。また、無線端末４は、例えばチャネルがビジー判定になった回数を記録したり、簡易的なスペアナを使用して当該時間帯の信号の有無を検出して記録してもよい。例えば、１分ごとにスキャンを１００回行い、一度もスキャン結果がビジーとならなければ、その場所や時間帯においてパッシブタグ優先帯域の利用はないと判定してもよい。 The wireless terminal 4 performs a scan in which carrier sensing is performed continuously or fragmentarily for 5 msec or more, for example. Furthermore, the wireless terminal 4 may record the number of times a channel is determined to be busy, or may use a simple spectrum analyzer to detect and record the presence or absence of a signal in the relevant time period. For example, if a scan is performed 100 times every minute and the scan result does not show busy even once, it may be determined that the passive tag priority band is not used in that location or time period.
　そして、パッシブタグ優先帯域利用を希望する無線通信端末（基地局１及び送信端末２）は、制御装置３に対して問い合わせを行う。制御装置３は、収集した情報に基づいてパッシブタグ優先帯域を利用すべきか否かを判定し、結果を問い合わせた無線通信端末に回答する。 Then, the wireless communication terminals (base station 1 and transmitting terminal 2) that wish to use the passive tag priority band make an inquiry to the control device 3. The control device 3 determines whether or not the passive tag priority band should be used based on the collected information, and replies to the wireless communication terminal that inquired about the result.
　また、制御装置３は、収集したデータを位置情報とともに記録し、データベースとして保存してもよい。この場合、制御装置３は、無線端末４がその都度スキャンを行うことなく、パッシブタグ優先帯域の利用状況を基地局１へ通知することができる。 Additionally, the control device 3 may record the collected data together with the position information and save it as a database. In this case, the control device 3 can notify the base station 1 of the usage status of the passive tag priority band without the wireless terminal 4 scanning each time.
　なお、送信端末２が制御装置３の機能を備えていてもよい。また、基地局１と送信端末２とがそれぞれ同じ機能を備えた無線通信端末であってもよい。 Note that the transmitting terminal 2 may have the functions of the control device 3. Furthermore, the base station 1 and the transmitting terminal 2 may be wireless communication terminals each having the same functions.
　図２は、基地局１の構成例を示す図である。図２に示すように、基地局１は、例えばメモリ１０、ドライブ１１、タイマ１２、ユーザインターフェース１３、有線通信モジュール１４、第１無線通信モジュール１５－１、第２無線通信モジュール１５－２、及び制御回路１６がバス１７を介して接続されている。 FIG. 2 is a diagram showing an example of the configuration of the base station 1. As shown in FIG. 2, the base station 1 includes, for example, a memory 10, a drive 11, a timer 12, a user interface 13, a wired communication module 14, a first wireless communication module 15-1, a second wireless communication module 15-2, and A control circuit 16 is connected via a bus 17.
　メモリ１０は、例えば制御プログラム１００及び管理情報１０２などを記憶する記憶装置である。ドライブ１１は、記憶媒体１１０との間でデータの読み込み又は書き込みを行う。タイマ１２は、基地局１が制御を行う場合の時間の計測を行う。ユーザインターフェース１３は、例えばキーボード及びディスプレイなどからなる入出力装置である。 The memory 10 is a storage device that stores, for example, a control program 100 and management information 102. The drive 11 reads data from or writes data to the storage medium 110 . The timer 12 measures time when the base station 1 performs control. The user interface 13 is an input/output device including, for example, a keyboard and a display.
　有線通信モジュール１４は、他の装置との間で有線通信を行うモジュールである。第１無線通信モジュール１５－１及び第２無線通信モジュール１５－２は、それぞれ異なるＮＩＣを備え、それぞれ他の装置との間で異なるチャネルを使用して無線通信を行うモジュールである。 The wired communication module 14 is a module that performs wired communication with other devices. The first wireless communication module 15-1 and the second wireless communication module 15-2 each have a different NIC, and are modules that perform wireless communication with other devices using different channels.
　第１無線通信モジュール１５－１は、例えばパッシブタグ優先帯域（図２参照）を用いて無線通信を行う。また、第２無線通信モジュール１５－２は、例えばアクティブタグ共用帯域（図２参照）を用いて無線通信を行う。なお、基地局１が備える無線通信モジュールの数は、２つに限定されない。 The first wireless communication module 15-1 performs wireless communication using, for example, the passive tag priority band (see FIG. 2). Further, the second wireless communication module 15-2 performs wireless communication using, for example, the active tag common band (see FIG. 2). Note that the number of wireless communication modules included in the base station 1 is not limited to two.
　制御回路１６は、ＣＰＵ１６０を備え、基地局１を構成する各部を制御する。例えば、制御回路１６は、タイマ１２が計測した時間を用いた制御を行う。 The control circuit 16 includes a CPU 160 and controls each part that constitutes the base station 1. For example, the control circuit 16 performs control using the time measured by the timer 12.
　図３は、９２０ＭＨｚ帯の各周波数帯における送信時間制限のパラメータの組み合わせを示す図である。図４は、９２０ＭＨｚ帯におけるパッシブタグ優先帯域のチャネルと中心周波数を示す図である。図３に示した（Ａ）は、パッシブタグ優先帯域のパラメータを示す。また、図３に示した（Ｂ）は、アクティブタグ共用帯域のパラメータを示す。 FIG. 3 is a diagram showing combinations of transmission time limit parameters in each frequency band of the 920 MHz band. FIG. 4 is a diagram showing channels and center frequencies of the passive tag priority band in the 920 MHz band. (A) shown in FIG. 3 shows the parameters of the passive tag priority band. Further, (B) shown in FIG. 3 shows the parameters of the active tag shared band.
　パッシブタグ優先帯域は、総送信時間率に制限がないチャネルである。パッシブタグ優先帯域では、パッシブタグ動作をアクティブタグの送信で妨げないようにキャリアセンス時間が長く規定され、休止時間が設けられている。 A passive tag priority band is a channel with no limit on the total transmission time rate. In the passive tag priority band, a long carrier sense time is defined and a pause time is provided so that the passive tag operation is not hindered by active tag transmission.
　具体的には、パッシブタグ優先帯域は、送信前のキャリアセンス時間が５ｍｓｅｃ以上と規定され、応答信号以外の送信を停止する休止時間が電波を発射してから５０ｍｓｅｃ以上と規定されている。なお、パッシブタグ優先帯域は、一旦５ｍｓｅｃ以上のキャリアセンスを行った後には、最初に電波を発射してから４ｓｅｃ以内に限り、休止時間を必要とせず、キャリアセンス時間も１２８μｓｅｃに規定されている。 Specifically, in the passive tag priority band, the carrier sense time before transmission is defined as 5 msec or more, and the pause time for stopping transmission of anything other than a response signal is defined as 50 msec or more after emitting radio waves. In addition, the passive tag priority band does not require a pause time only within 4 seconds after the first radio wave is emitted after carrying out carrier sense for 5 msec or more, and the carrier sense time is also specified as 128 μsec. .
　つまり、パッシブタグ優先帯域は、５ｍｓｅｃ以上のキャリアセンスの後に、電波を発射してから４ｓｅｃ間は、これらの制限がなくなるため、効率よく送信ができる。 In other words, in the passive tag priority band, after carrier sensing for 5 msec or more, these restrictions are eliminated for 4 seconds after emitting radio waves, so efficient transmission is possible.
　アクティブタグ共用帯域は、総送信時間率に制限があるチャネルである。具体的には、アクティブタグ共用帯域は、総送信時間率が１０％以下に規定され、送信前のキャリアセンス時間が１２８μｓｅｃに規定されている。つまり、アクティブタグ優先帯域では、１時間当たりの送信時間総和が３６０秒に制限されているため、大容量の通信が難しい場合がある。 The active tag shared band is a channel with a limit on the total transmission time rate. Specifically, in the active tag shared band, the total transmission time rate is defined as 10% or less, and the carrier sense time before transmission is defined as 128 μsec. In other words, in the active tag priority band, the total transmission time per hour is limited to 360 seconds, so large-capacity communication may be difficult.
　図５は、制御装置３が有する機能を例示する機能ブロック図である。図５に示すように、制御装置３は、受信部３０、収集部３１、記憶部３２、判定部３３、結果送信部３４及び制御部３５を有する。 FIG. 5 is a functional block diagram illustrating the functions that the control device 3 has. As shown in FIG. 5, the control device 3 includes a receiving section 30, a collecting section 31, a storage section 32, a determining section 33, a result transmitting section 34, and a controlling section 35.
　受信部３０は、基地局１及び無線端末４がそれぞれ送信する情報を受信し、受信した情報を収集部３１に対して出力する。 The receiving unit 30 receives information transmitted by the base station 1 and the wireless terminal 4, and outputs the received information to the collecting unit 31.
　収集部３１は、受信部３０が受信した情報を収集し、記憶部３２に対して出力する。例えば、収集部３１は、基地局（無線通信端末）１の周囲でパッシブタグ優先帯域のチャネルを使用していない無線端末４がパッシブタグ優先帯域のチャネルの利用状況を観測した結果を示す観測結果情報を収集し、記憶部３２に対して出力する。 The collection unit 31 collects the information received by the reception unit 30 and outputs it to the storage unit 32. For example, the collection unit 31 collects observation results indicating the usage status of channels in the passive tag priority band by wireless terminals 4 that are not using channels in the passive tag priority band around the base station (wireless communication terminal) 1. Information is collected and output to the storage unit 32.
　さらに、収集部３１は、パッシブタグ優先帯域のチャネルの利用状況を観測した結果を示す観測結果情報とともに、パッシブタグ優先帯域のチャネルを使用していない無線端末４などがパッシブタグ優先帯域のチャネルの利用状況を観測した位置（及び時間）を示す位置情報（及び時間情報）を収集し、記憶部３２に対して出力する。 Furthermore, the collection unit 31 collects observation result information indicating the result of observing the usage status of the channel in the passive tag priority band, and also collects information about the channel usage status of the passive tag priority band when the wireless terminal 4 or the like that does not use the channel in the passive tag priority band uses the channel in the passive tag priority band. Location information (and time information) indicating the location (and time) at which usage status was observed is collected and output to the storage unit 32.
　記憶部３２は、収集部３１が収集した観測結果情報、及び判定部３３が判定した結果などの情報を記憶する。例えば、記憶部３２は、収集部３１が収集した観測結果情報及び位置情報を合わせて記憶する。 The storage unit 32 stores information such as observation result information collected by the collection unit 31 and results determined by the determination unit 33. For example, the storage unit 32 stores both observation result information and position information collected by the collection unit 31.
　判定部３３は、収集部３１収集した観測結果情報に基づいて、基地局１及び送信端末２がパッシブタグ優先帯域のチャネルを利用することの可否を判定し、判定結果を記憶部３２に対して出力する。また、判定部３３は、収集部３１が新たに観測結果情報を収集していない場合に、記憶部３２が記憶している観測結果情報に基づいて、基地局１及び送信端末２がパッシブタグ優先帯域のチャネルを利用することの可否を判定する。 The determining unit 33 determines whether the base station 1 and the transmitting terminal 2 can use the channel of the passive tag priority band based on the observation result information collected by the collecting unit 31, and stores the determination result in the storage unit 32. Output. Further, when the collection unit 31 has not newly collected observation result information, the determination unit 33 determines that the base station 1 and the transmitting terminal 2 give priority to passive tags based on the observation result information stored in the storage unit 32. Determine whether or not the channel of the band can be used.
　また、判定部３３は、記憶部３２が記憶している観測結果情報及び位置情報に基づいて、基地局１及び送信端末２がパッシブタグ優先帯域のチャネルを利用することの可否を判定してもよい。 Further, the determination unit 33 determines whether or not the base station 1 and the transmitting terminal 2 can use the channel of the passive tag priority band based on the observation result information and position information stored in the storage unit 32. good.
　結果送信部３４は、判定部３３が判定した結果を示す判定結果情報を、基地局１からの要求に応じて送信する。 The result transmitting unit 34 transmits determination result information indicating the result determined by the determining unit 33 in response to a request from the base station 1.
　制御部３５は、制御装置３を構成する各部を制御する。 The control unit 35 controls each unit making up the control device 3.
　図６は、基地局（無線通信端末）１が有する機能を例示する機能ブロック図である。図６に示すように、基地局１は、例えば要求送信部６０、結果受信部６１、記憶部６２、制御部６３を有する。 FIG. 6 is a functional block diagram illustrating functions that the base station (wireless communication terminal) 1 has. As shown in FIG. 6, the base station 1 includes, for example, a request transmitting section 60, a result receiving section 61, a storage section 62, and a control section 63.
　また、送信端末２は、図６に示した基地局１の各機能を備えていてもよく、さらに、無線端末４と同様に機能するように観測部６４を備えていてもよい。 Further, the transmitting terminal 2 may include each function of the base station 1 shown in FIG. 6, and may further include an observation unit 64 so as to function similarly to the wireless terminal 4.
　要求送信部６０は、制御装置３の結果送信部３４による判定結果情報の送信を制御装置３に対して要求する。 The request transmitter 60 requests the control device 3 to transmit the determination result information by the result transmitter 34 of the control device 3.
　結果受信部６１は、制御装置３の結果送信部３４が送信した判定結果情報を受信し、記憶部６２に対して出力する。 The result receiving unit 61 receives the determination result information transmitted by the result transmitting unit 34 of the control device 3 and outputs it to the storage unit 62.
　記憶部６２は、結果受信部６１が受信した情報などを記憶する。 The storage unit 62 stores information received by the result receiving unit 61.
　制御部６３は、基地局１（送信端末２も同様）を構成する各部を制御する。例えば、制御部６３は、結果受信部６１が受信した判定結果情報がパッシブタグ優先帯域のチャネルを利用可であることを示す場合に、当該基地局１（送信端末２も同様）がパッシブタグ優先帯域のチャネルを利用するように制御する。 The control unit 63 controls each unit configuring the base station 1 (same as the transmitting terminal 2). For example, when the determination result information received by the result receiving unit 61 indicates that the channel of the passive tag priority band can be used, the control unit 63 controls whether the base station 1 (same as the transmitting terminal 2) has the passive tag priority band. Control the use of channels in the band.
　観測部６４は、パッシブタグ優先帯域のチャネルをデータフレームの送信に使用していないときに、周囲のパッシブタグ優先帯域のチャネルの利用状況を観測し、観測結果を制御部６３などに対して出力する。 The observation unit 64 observes the usage status of the surrounding channels in the passive tag priority band when the channel in the passive tag priority band is not used for data frame transmission, and outputs the observation results to the control unit 63 etc. do.
　この場合、基地局１（送信端末２も同様）は、要求送信部６０により観測部６４が観測した利用状況に基づいてパッシブタグ優先帯域のチャネルを利用することの可否を判定した結果を示す判定結果情報の送信を制御装置３に対して要求する。 In this case, the base station 1 (same as the transmitting terminal 2) makes a determination indicating the result of determining whether or not the channel of the passive tag priority band can be used based on the usage status observed by the observation unit 64 by the request transmission unit 60. A request is made to the control device 3 to send the result information.
　図７は、一実施形態にかかる基地局１がパッシブタグ優先帯域で送信フレームを送信するタイミングを示す図である。ｓｕｂ１ＧＨｚで利用される無線通信規格の一つとして、ＩＥＥＥ　８０２．１１ａｈがある。ＩＥＥＥ　８０２．１１ａｈでは、無線通信フレームの時間長は、２８ｍｓｅｃとなっている。 FIG. 7 is a diagram showing the timing at which the base station 1 according to one embodiment transmits a transmission frame in the passive tag priority band. IEEE 802.11ah is one of the wireless communication standards used in sub1GHz. In IEEE 802.11ah, the time length of a wireless communication frame is 28 msec.
　そのため、送信時間制限が４ｓｅｃ以下となっていても、複数の無線通信装置やトラヒックが混在している場合、数が多いと各無線通信装置のトラヒックの遅延時間が長くなることがある。また、ＴＣＰ　ＡＣＫなどのデータフレーム通信間では、必要な上下通信も交互に送信する。 Therefore, even if the transmission time limit is 4 seconds or less, if multiple wireless communication devices and traffic are mixed, the delay time of the traffic of each wireless communication device may become long if there are many. Further, necessary upstream and downstream communications are also transmitted alternately between data frame communications such as TCP ACK.
　図８は、一実施形態にかかる無線通信システムの動作例を示すフローチャートである。例えば、基地局１は、５ｍｓｅｃ以上のキャリアセンスを１００回実行し、ビジーとなる回数をカウントする（Ｓ１００）。 FIG. 8 is a flowchart illustrating an example of the operation of the wireless communication system according to one embodiment. For example, the base station 1 executes carrier sense for 5 msec or more 100 times and counts the number of times it becomes busy (S100).
　制御装置３は、規定のビジー率（例えば１００回中２０回以上）のビジーが観測されたか否かを判定する（Ｓ１０２）。制御装置３は、規定のビジー率のビジーが観測されたと判定した場合（Ｓ１０２：Ｙｅｓ）にはＳ１０６の処理に進み、規定のビジー率のビジーが観測されないと判定した場合（Ｓ１０２：Ｎｏ）にはＳ１０４の処理に進む。 The control device 3 determines whether a specified busy rate (for example, 20 times or more out of 100 times) is observed (S102). When the control device 3 determines that a busy state with a specified busy rate is observed (S102: Yes), the control device 3 proceeds to the process of S106, and when it determines that a busy state with a specified busy rate is not observed (S102: No). The process proceeds to S104.
　ステップ１０４（Ｓ１０４）において、制御装置３は、基地局１及び送信端末２がパッシブタグ優先帯域を使用可能であると判定する。 In step 104 (S104), the control device 3 determines that the base station 1 and the transmitting terminal 2 can use the passive tag priority band.
　ステップ１０６（Ｓ１０６）において、制御装置３は、基地局１及び送信端末２がパッシブタグ優先帯域を使用不可であると判定する。 In step 106 (S106), the control device 3 determines that the base station 1 and the transmitting terminal 2 are unable to use the passive tag priority band.
　このように、一実施形態にかかる無線通信システムは、収集部３１が収集した観測結果情報に基づいて、基地局１及び送信端末２がパッシブタグ優先帯域のチャネルを利用することの可否を判定するので、周波数帯の利用の可否を短時間で確認することができる。 In this way, the wireless communication system according to one embodiment determines whether the base station 1 and the transmitting terminal 2 can use the channel of the passive tag priority band based on the observation result information collected by the collecting unit 31. Therefore, the availability of the frequency band can be confirmed in a short time.
　また、無線通信システムは、収集部３１が収集した観測結果情報に基づいて、閾値判定を行い、閾値を境にパッシブタグ優先帯域が利用可能と判定してもよい。 Additionally, the wireless communication system may perform a threshold determination based on the observation result information collected by the collection unit 31, and determine that the passive tag priority band is available after the threshold.
　例えば、簡易スペアナで観測される信号の占有時間率を観測して既定の値（例２０％）以上の場合はパッシブタグ優先帯域を利用不可と判定してもよい。また、キャリアセンスのビジー率が既定の値（例２０％）を超えた場合、パッシブタグ優先帯域を利用不可と判定してもよい。 For example, if the occupied time rate of the signal observed with a simple spectrum analyzer is equal to or higher than a predetermined value (eg, 20%), it may be determined that the passive tag priority band cannot be used. Furthermore, if the carrier sense busy rate exceeds a predetermined value (eg, 20%), it may be determined that the passive tag priority band cannot be used.
　また、制御装置３は、無線端末４の位置情報に基づいて、影響があると判定される範囲（例えば数百ｍ以内）の判定結果を利用して周波数チャネルの利用可否を判定してもよい。 Further, the control device 3 may determine whether or not a frequency channel can be used, based on the position information of the wireless terminal 4, using the determination result of a range determined to be affected (for example, within several hundred meters). .
　なお、基地局１、送信端末２、制御装置３、及び無線端末４がそれぞれ有する各機能は、それぞれ一部又は全部がＰＬＤ（Programmable Logic Device）やＦＰＧＡ（Field Programmable Gate Array）等のハードウェアによって構成されてもよいし、ＣＰＵ等のプロセッサが実行するプログラムとして構成されてもよい。 Note that each function of the base station 1, transmitting terminal 2, control device 3, and wireless terminal 4 is partially or entirely implemented by hardware such as a PLD (Programmable Logic Device) or an FPGA (Field Programmable Gate Array). Alternatively, the program may be configured as a program executed by a processor such as a CPU.
　例えば、基地局１、送信端末２、制御装置３、及び無線端末４それぞれは、コンピュータとプログラムを用いて実現することができ、プログラムを記憶媒体に記録することも、ネットワークを通して提供することも可能である。 For example, each of the base station 1, transmitting terminal 2, control device 3, and wireless terminal 4 can be realized using a computer and a program, and the program can be recorded on a storage medium or provided through a network. It is.
　１・・・基地局、２・・・送信端末、３・・・制御装置、４・・・無線端末、１０・・・メモリ、１２・・・タイマ、１３・・・ユーザインターフェース、１４・・・有線通信モジュール、１５－１・・・第１無線通信モジュール、１５－２・・・第２無線通信モジュール、１６・・・制御回路、１７・・・バス、３０・・・受信部、３１・・・収集部、３２・・・記憶部、３３・・・判定部、３４・・・結果送信部、３５・・・制御部、６０・・・要求送信部、６１・・・結果受信部、６２・・・記憶部、６３・・・制御部、６４・・・観測部、１００・・・制御プログラム、１０２・・・管理情報、１１０・・・記憶媒体、１６０・・・ＣＰＵ DESCRIPTION OF SYMBOLS 1... Base station, 2... Transmission terminal, 3... Control device, 4... Wireless terminal, 10... Memory, 12... Timer, 13... User interface, 14... - Wired communication module, 15-1... First wireless communication module, 15-2... Second wireless communication module, 16... Control circuit, 17... Bus, 30... Receiving section, 31 . . . Collection unit, 32 . . . Storage unit, 33 . , 62... Storage unit, 63... Control unit, 64... Observation unit, 100... Control program, 102... Management information, 110... Storage medium, 160... CPU

Claims (7)

  1. 　総送信時間率に制限がある第１チャネルと、応答信号以外の送信を停止する休止時間、及び送信前のキャリアセンス時間を前記第１チャネルよりも長く規定されて総送信時間率に制限がない第２チャネルとを使用して無線通信を可能にされた無線通信端末と、
    　前記無線通信端末を制御する制御装置と
    　を備え、
    　前記制御装置は、
    　前記無線通信端末の周囲で前記第２チャネルを使用していない装置が前記第２チャネルの利用状況を観測した結果を示す観測結果情報を収集する収集部と、
    　前記収集部が収集した観測結果情報に基づいて、前記無線通信端末が前記第２チャネルを利用することの可否を判定する判定部と、
    　前記判定部が判定した結果を示す判定結果情報を、前記無線通信端末からの要求に応じて送信する結果送信部と
    　を有し、
    　前記無線通信端末は、
    　前記結果送信部による判定結果情報の送信を前記制御装置に対して要求する要求送信部と、
    　前記結果送信部が送信した判定結果情報を受信する結果受信部と、
    　前記結果受信部が受信した判定結果情報が前記第２チャネルを利用可であることを示す場合に、当該無線通信端末が前記第２チャネルを利用するように制御する制御部と
    　を有することを特徴とする無線通信システム。     The first channel has a limit on the total transmission time rate, the pause time for stopping transmission of anything other than the response signal, and the carrier sense time before transmission is defined to be longer than the first channel, and there is no limit on the total transmission time rate. a wireless communication terminal capable of wireless communication using a second channel;
    a control device that controls the wireless communication terminal;
    The control device includes:
    a collection unit that collects observation result information indicating a result of observing the usage status of the second channel by devices that are not using the second channel around the wireless communication terminal;
    a determination unit that determines whether or not the wireless communication terminal can use the second channel based on observation result information collected by the collection unit;
    and a result transmitting unit that transmits determination result information indicating a result determined by the determination unit in response to a request from the wireless communication terminal,
    The wireless communication terminal includes:
    a request transmitter that requests the control device to transmit determination result information by the result transmitter;
    a result receiving unit that receives the determination result information transmitted by the result transmitting unit;
    and a control unit that controls the wireless communication terminal to use the second channel when the determination result information received by the result receiving unit indicates that the second channel can be used. wireless communication system.
  2. 　前記制御装置は、
    　前記収集部が収集した観測結果情報を記憶する記憶部をさらに有し、
    　前記判定部は、
    　前記収集部が新たに観測結果情報を収集していない場合に、前記記憶部が記憶している観測結果情報に基づいて、前記無線通信端末が前記第２チャネルを利用することの可否を判定すること
    　を特徴とする請求項１に記載の無線通信システム。     The control device includes:
    further comprising a storage unit that stores observation result information collected by the collection unit,
    The determination unit includes:
    When the collection unit has not newly collected observation result information, the radio communication terminal determines whether or not it is possible to use the second channel based on the observation result information stored in the storage unit. The wireless communication system according to claim 1, characterized in that:
  3. 　前記収集部は、
    　前記第２チャネルの利用状況を観測した結果を示す観測結果情報とともに、前記第２チャネルを使用していない装置が前記第２チャネルの利用状況を観測した位置を示す位置情報を収集し、
    　前記記憶部は、
    　前記収集部が収集した観測結果情報及び位置情報を合わせて記憶し、
    　前記判定部は、
    　前記記憶部が記憶している観測結果情報及び位置情報に基づいて、前記無線通信端末が前記第２チャネルを利用することの可否を判定すること
    　を特徴とする請求項２に記載の無線通信システム。     The collection unit includes:
    Collecting observation result information indicating a result of observing the usage status of the second channel as well as location information indicating a position where a device not using the second channel observed the usage status of the second channel,
    The storage unit includes:
    storing observation result information and position information collected by the collection unit;
    The determination unit includes:
    The wireless communication system according to claim 2, wherein the wireless communication terminal determines whether or not the wireless communication terminal can use the second channel based on observation result information and position information stored in the storage unit. .
  4. 　総送信時間率に制限がある第１チャネルと、応答信号以外の送信を停止する休止時間、及び送信前のキャリアセンス時間を前記第１チャネルよりも長く規定されて総送信時間率に制限がない第２チャネルとを使用して無線通信を可能にされた無線通信端末と、前記無線通信端末を制御する制御装置とを備える無線通信システムが行う無線通信方法において、
    　前記無線通信端末の周囲で前記第２チャネルを使用していない装置が前記第２チャネルの利用状況を観測した結果を示す観測結果情報を収集する収集工程と、
    　収集した観測結果情報に基づいて、前記無線通信端末が前記第２チャネルを利用することの可否を判定する判定工程と、
    　判定した結果を示す判定結果情報が前記第２チャネルを利用可であることを示す場合に、前記無線通信端末が前記第２チャネルを利用するように制御する制御工程と
    　を含むことを特徴とする無線通信方法。     The first channel has a limit on the total transmission time rate, the pause time for stopping transmission of anything other than the response signal, and the carrier sense time before transmission is defined to be longer than the first channel, and there is no limit on the total transmission time rate. A wireless communication method performed by a wireless communication system comprising a wireless communication terminal capable of wireless communication using a second channel and a control device that controls the wireless communication terminal,
    a collecting step of collecting observation result information indicating the results of observing the usage status of the second channel by devices that are not using the second channel around the wireless communication terminal;
    a determination step of determining whether or not the wireless communication terminal can use the second channel based on the collected observation result information;
    and a control step of controlling the wireless communication terminal to use the second channel when determination result information indicating the determined result indicates that the second channel can be used. Wireless communication method.
  5. 　前記制御装置は、
    　収集した観測結果情報を記憶する記憶部を有し、
    　前記判定工程では、
    　新たに観測結果情報を収集していない場合に、前記記憶部が記憶している観測結果情報に基づいて、前記無線通信端末が前記第２チャネルを利用することの可否を判定すること
    　を特徴とする請求項４に記載の無線通信方法。     The control device includes:
    It has a storage unit that stores collected observation result information,
    In the determination step,
    If no new observation result information is collected, the radio communication terminal determines whether or not it is possible to use the second channel based on the observation result information stored in the storage unit. The wireless communication method according to claim 4.
  6. 　前記収集工程では、
    　前記第２チャネルの利用状況を観測した結果を示す観測結果情報とともに、前記第２チャネルを使用していない装置が前記第２チャネルの利用状況を観測した位置を示す位置情報を収集し、
    　前記記憶部は、
    　収集した観測結果情報及び位置情報を合わせて記憶し、
    　前記判定工程では、
    　前記記憶部が記憶している観測結果情報及び位置情報に基づいて、前記無線通信端末が前記第２チャネルを利用することの可否を判定すること
    　を特徴とする請求項５に記載の無線通信方法。     In the collection step,
    Collecting observation result information indicating a result of observing the usage status of the second channel as well as location information indicating a position where a device not using the second channel observed the usage status of the second channel,
    The storage unit includes:
    The collected observation result information and location information are stored together,
    In the determination step,
    The wireless communication method according to claim 5, further comprising determining whether or not the wireless communication terminal can use the second channel based on observation result information and position information stored in the storage unit. .
  7. 　総送信時間率に制限がある第１チャネルと、応答信号以外の送信を停止する休止時間、及び送信前のキャリアセンス時間を前記第１チャネルよりも長く規定されて総送信時間率に制限がない第２チャネルとを使用し、制御装置の制御に応じて無線通信を行う無線通信端末において、
    　前記第２チャネルをデータフレームの送信に使用していないときに、前記第２チャネルの利用状況を観測する観測部と、
    　前記観測部が観測した記第２チャネルの利用状況に基づいて前記第２チャネルを利用することの可否を判定した結果を示す判定結果情報の送信を前記制御装置に対して要求する要求送信部と、
    　前記要求送信部の要求に応じて前記制御装置が送信した判定結果情報を受信する結果受信部と、
    　前記結果受信部が受信した判定結果情報が前記第２チャネルを利用可であることを示す場合に、当該無線通信端末が前記第２チャネルを利用するように制御する制御部と
    　を有することを特徴とする無線通信端末。     The first channel has a limit on the total transmission time rate, the pause time for stopping transmission of anything other than the response signal, and the carrier sense time before transmission is defined to be longer than the first channel, and there is no limit on the total transmission time rate. A wireless communication terminal that uses a second channel to perform wireless communication under the control of a control device,
    an observation unit that observes the usage status of the second channel when the second channel is not used for transmitting data frames;
    a request transmitting unit that requests the control device to transmit determination result information indicating a result of determining whether or not the second channel can be used based on the usage status of the second channel observed by the observation unit; ,
    a result receiving unit that receives determination result information transmitted by the control device in response to a request from the request transmitting unit;
    and a control unit that controls the wireless communication terminal to use the second channel when the determination result information received by the result receiving unit indicates that the second channel can be used. A wireless communication terminal.
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SHOKO SHINOHARA, YASUHIKO INOUE, YUSUKE ASAI, YASUSHI TAKATORI: "Channel Selection Technique of Wide Area Wireless LAN IEEE 802.11ah for IoT", IEICE TECHNICAL REPORT, RCS, IEICE, JP, vol. 121, no. 43 (RCS2021-23), 20 May 2021 (2021-05-20), JP, pages 41 - 46, XP009551152 *

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