WO2022054179A1 - Système de commande de ligne, machine radio logicielle, procédé de commande de ligne et programme de commande de ligne - Google Patents

Système de commande de ligne, machine radio logicielle, procédé de commande de ligne et programme de commande de ligne Download PDF

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Publication number
WO2022054179A1
WO2022054179A1 PCT/JP2020/034173 JP2020034173W WO2022054179A1 WO 2022054179 A1 WO2022054179 A1 WO 2022054179A1 JP 2020034173 W JP2020034173 W JP 2020034173W WO 2022054179 A1 WO2022054179 A1 WO 2022054179A1
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WIPO (PCT)
Prior art keywords
communication
software defined
defined radio
line
spare
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PCT/JP2020/034173
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English (en)
Japanese (ja)
Inventor
利文 宮城
一夫 大坂
博幸 古谷
仁 長谷川
隼人 福園
文昭 永瀬
優 小野
圭太 栗山
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日本電信電話株式会社
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Priority to PCT/JP2020/034173 priority Critical patent/WO2022054179A1/fr
Priority to JP2022548300A priority patent/JPWO2022054179A1/ja
Publication of WO2022054179A1 publication Critical patent/WO2022054179A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission

Definitions

  • This disclosure relates to a line control system, a software defined radio, a line control method, and a line control program, and is particularly suitable for reducing packet loss in the event of a failure. , And the program for line control.
  • Patent Document 1 discloses "a multiplex wireless device and a line control method by link aggregation". Specifically, Patent Document 1 proposes a line control method in a redundant configuration of a multiplex wireless device utilizing a link aggregation technique. In the invention described in Patent Document 1, by integrating the switching control to the wireless backup line and the link aggregation control, the time until the deterioration of the line quality is detected and the wireless line is switched is shortened. According to the present invention, by reducing the time as described above, it is possible to provide a wireless device that suppresses traffic data that is discarded due to deterioration of line quality.
  • the quality of the switching destination wireless line can be determined, but when it is determined that the quality of most of the switching destination wireless lines is deteriorated, it may be difficult to switch the wireless line. ..
  • the first purpose of this disclosure is to provide a line control system that can reduce the amount of traffic data to be discarded by utilizing software defined radio technology.
  • the second purpose of this disclosure is to provide a software defined radio that can reduce the amount of traffic data to be discarded by utilizing software defined radio technology.
  • the third purpose of this disclosure is to provide a line control method capable of reducing the amount of traffic data to be discarded by utilizing software defined radio technology.
  • the fourth object of the present disclosure is to provide a line control program capable of reducing the amount of traffic data to be discarded by utilizing software defined radio technology.
  • the first aspect is a hardware resource for wireless communication that can be reconfigured by changing software in order to achieve the above object, and a memory that stores software for making the hardware resource compatible with wireless communication.
  • a line control system that utilizes a software radio equipped with a control unit that reconfigures the hardware resources using software stored in the memory, the main software radio and the spare software radio. Including, the control unit of the main software radio performs a process for establishing communication on one or more communication lines defined by a communication method and a frequency band, and the control unit of the spare software radio is , The line preparation process for preparing a spare communication line corresponding to the communication line used for communication in the main software radio so that it can communicate, and the communication line during communication of at least one of the main software radios.
  • the condition detection process for detecting the establishment of the condition for switching to the spare communication line, and the switching process for switching the at least one communication line in communication to the spare communication line when the establishment of the condition is detected. It is desirable to execute.
  • the second aspect is a hardware resource for wireless communication that can be reconfigured by changing the software, a memory that stores software for making the hardware resource compatible with wireless communication, and a memory that is stored in the memory.
  • It is a software radio device including a control unit that reconfigures the hardware resource using the software, and the control unit is a process for a main device for making the software radio device function as a main software radio device.
  • the processing for the spare device to make the software radio function as a spare software radio and the processing for the main device is one or more defined by the communication method and the frequency band.
  • the process for the spare device includes a process for establishing communication on the communication line, and the process for the spare device corresponds to a communication line used for communication in the main software radio device in communication paired with the spare software radio device.
  • the third aspect is a hardware resource for wireless communication that can be reconfigured by changing the software, a memory that stores software for making the hardware resource compatible with wireless communication, and a memory stored in the memory. It is a line control method using a line control system utilizing a software radio equipped with a control unit for reconfiguring the hardware resource using the software, and prepares a main software radio and a spare software radio. A step of causing the control unit of the main software radio to execute a process for establishing communication on one or more communication lines defined by a communication method and a frequency band, and the spare software radio.
  • a step of detecting the establishment of a condition for switching a communication line to the spare communication line, and a step of switching the communication line during at least one communication to the spare communication line when the establishment of the condition is detected. Is desirable to include.
  • the fourth aspect is a line control program, and it is desirable that the computer includes a program for realizing the function of the software defined radio according to the second aspect.
  • the spare software defined radio can flexibly prepare a spare communication line. .. Then, with the spare communication line ready, it is possible to switch from the communication line being communicated to the spare communication line. Therefore, according to this aspect, it is possible to flexibly respond to changes in the communication environment and effectively avoid the occurrence of packet loss.
  • FIG. 7 It is a block diagram for demonstrating the element configured inside the software defined radio included in the line control system shown in FIG. 7. It is a flowchart for demonstrating the content of the process executed by the two software defined radios shown in FIG. It is a figure which shows the structure of the line control system of Embodiment 4 of this disclosure. It is a block diagram for demonstrating the element configured inside the software defined radio included in the line control system shown in FIG. It is a flowchart for demonstrating the content of the process executed by two software defined radios shown in FIG.
  • FIG. 1 shows an example of the line control system according to the first embodiment of the present disclosure.
  • the line control system shown in FIG. 1 includes four software defined radios 10-1 to 10-4.
  • the software defined radio 10-1 on the upper left in the figure is the first main radio device.
  • the software defined radio 10-2 in the lower left of the figure is a spare radio device of the software defined radio 10-1.
  • These two software defined radios 10-1 and 10-2 can transmit and receive radio signals via the antenna 12-1.
  • the software defined radio 10-3 on the upper right of the figure is the second main radio device.
  • the software defined radio 10-4 in the lower right of the figure is a spare radio device of the software defined radio 10-3.
  • These two software defined radios 10-3 and 10-4 can transmit and receive radio signals via the antenna 12-2.
  • the software defined radio 10-1 and the software defined radio 10-3 are constantly operating, and communication is performed between them.
  • the software defined radio 10-2 and the software defined radio 10-4 are in a standby state in preparation for a failure of the wireless device during communication.
  • software defined radio 10 when it is not necessary to distinguish between the four software defined radios 10-1 to 10-4, they are collectively referred to as "software defined radio 10".
  • antenna 12 When it is not necessary to distinguish between the two communication antennas 12-1 and 12-2, they are collectively referred to as "antenna 12".
  • the software defined radio 10 is equipped with hardware that can be reconfigured by software, and the frequency band and communication method used for wireless communication can be changed as needed.
  • the software defined radio 10 can be used, for example, as a base station for mobile communication.
  • the software defined radio 10 includes an FPGA (Field Programmable Gate Array) 14.
  • the FPGA 14 is a device that can program various logic circuit configurations by rewriting software.
  • the FPGA 14 functions as a baseband processing unit that processes a baseband signal transmitted by communication.
  • the FPGA 14 may be replaced with a general computer or a DSP (Digital Signal Processor).
  • the software defined radio 10 includes an AD / DA converter 16 and an RF front end unit 18.
  • the AD / DA converter 16 and the RF front end portion 18 process high frequency signals between the antenna 12 and the FPGA 12.
  • the software defined radio 10 further includes a control unit 20.
  • the control unit 20 has various interfaces, a CPU, a memory, and the like built-in.
  • the control unit 20 controls the FPGA 14, the AD / DA converter 16, and the RF front end unit 18 by proceeding with processing according to a program stored in the memory. Specifically, the control unit 20 detects a communication state required for the software defined radio 10, and reconfigures the hardware corresponding to the state.
  • the software defined radio 10 can change the communication method by changing the software and reconfiguring the hardware resources.
  • hardware corresponding to four communication methods A to D WiFi (registered trademark) method, LTE method, etc. is configured in each of the software defined radios 10.
  • the software defined radio 10 can change the frequency band used for communication and the width of the frequency band.
  • four rectangular frames 22, 24, 26, and 28 described as “communication method A” to “communication method D” are shown in the frame of the software defined radio 10.
  • These rectangular frames 22, 24, 26, and 28 represent the frequency band of the communication line configured in the software defined radio 10.
  • the positions of the rectangular frames 22, 24, 26, and 28 in the vertical direction in the figure represent the height of the "frequency band”. Further, the vertical widths of the rectangular frames 22, 24, 26, and 28 represent the "width" of each frequency band. That is, the four rectangular frames 22, 24, 26, and 28 shown in FIG. 1 illustrate the following three events.
  • the software defined radio 10 shown in FIG. 1 has the following functions. 1.
  • the software defined radios 10-2 and 10-4, which are used as spare wireless devices, are communication lines that duplicate information such as the communication method and frequency used in the software defined radios 10-1, 10-3, which are used as the main wireless devices. To maintain a state in which communication with the opposite wireless device is possible. In the example shown in FIG. 1, this function replicates the same communication lines 22, 24, 26, and 28 as the software defined radios 10-1, 10-3 to each of the software defined radios 10-2 and 10-4. Has been done. 2.
  • the software defined radios 10-1 and 10-3 during communication recognize their own failure, they notify the spare software defined radios 10-2 and 10-4 of the occurrence of the failure. 3.
  • Each of the spare software defined radios 10-2 and 10-4 monitors the operating state of the hardware resources, specifically, the CPU and the memory of the software defined radios 10-1 and 10-3 during communication. 4. Each of the spare software defined radios 10-2 and 10-4 senses that the CPUs of the software defined radios 10-1 and 10-3 during communication are stopped, the usage rate suddenly rises, or the memory usage rate suddenly rises. Then, it is determined that the software defined radios 10-1 and 10-3 have failed. 5. When the failure of the software defined radios 10-1 and 10-3 during communication is determined, the wireless device in which the failure has occurred is switched to the spare software defined radios 10-2 and 10-4 to continue the communication.
  • the spare software defined radios 10-2, 10-4 are prepared with communication lines 22, 24, 26, 28 in which the communication method and frequency of the radio device being communicated are duplicated. Therefore, for example, when the software defined radio 10-1 is switched to the spare software defined radio 10-2, the software defined radio 10-3, which is the communication partner, does not change the communication method or the like, and the conventional software defined radio 10-3 is used. Communication can be continued.
  • the line control system of the present embodiment when a failure occurs in a wireless device during communication, the device is simply switched to a spare wireless device without notifying the opposite wireless device of the switch. , You can instantly regain good condition. Therefore, according to this system, even if a failure occurs in the wireless device during communication, communication can be continued without causing packet loss.
  • FIG. 2 is a block diagram for explaining the elements configured inside the software defined radios 10-1 and 10-2 shown in FIG.
  • the software defined radio 10-1 which is the main wireless device and the software defined radio 10-2 which is the spare wireless device have the same configuration and can function in the same manner.
  • the duplicate description of the common elements will be omitted, and the functions thereof will be described when the software defined radio 10-1 is in communication and the software defined radio 10-2 is a spare thereof.
  • the software defined radio 10-1 includes a radio wave transmitting unit 30.
  • the radio wave transmission unit 30 modulates data or the like provided from an external device into a transmission signal and transmits the data via the antenna 12-1.
  • the software defined radio 10 also includes a radio wave receiving unit 34.
  • the radio wave receiving unit 34 demodulates the radio signal received by the antenna 12-1 into a received signal and provides it to an external device.
  • the software defined radio 10-1 further includes a device status monitoring unit 36.
  • the device status monitoring unit 36 monitors the status of the software defined radio 10-1 during communication and detects a failure. When a failure is detected, the device status monitoring unit 36 notifies the device status monitoring unit 36 of the spare wireless device of the occurrence of the failure. With this notification as an opportunity, the communication by the software defined radio 10-1 is switched to the communication by the spare software defined radio 10-2.
  • the device status monitoring unit 36 of the spare software defined radio 10-2 monitors the status of the hardware resources of the software defined radio 10 during communication, specifically, the CPU and memory. Then, when the operation of the CPU is stopped, the CPU usage rate suddenly rises, or the memory usage rate suddenly rises, it is determined that the software defined radio 10-1 has a failure. When this determination is made, information is exchanged between the device status monitoring units 36 of both devices, and the communication by the software defined radio 10-1 is switched to the communication by the spare software defined radio 10-2. In this way, when the software defined radio 10-2 monitors the failure of the software defined radio 10-1, it is possible to quickly find a silent failure that the software defined radio 10-1 cannot notice by itself.
  • the software defined radio 10-1 includes a communication method control unit 38 and a frequency control unit 40.
  • the communication method control unit 38 selects a method to be used for communication from a plurality of methods prepared in advance. The selected communication method is reflected in the hardware configuration of the software defined radio 10-1, and is held in the information holding unit 42.
  • the frequency control unit 40 secures the frequency band required for the selected communication method.
  • the information of the frequency band set by the frequency control unit 40 is reflected in the hardware configuration of the software defined radio 10 and is held in the information holding unit 42, similarly to the information of the communication method.
  • the information holding unit 42 transmits information on the communication method and frequency band used in the software defined radio 10-1 during communication to the spare software defined radio 10-2.
  • the information holding unit 42 of the spare software defined radio 10-2 stores the information transmitted in this way.
  • the communication lines 22, 24, 26, 28 of the software defined radio 10-1 are duplicated based on the information stored in the information holding unit 42 in this way.
  • FIG. 3 is a flowchart of processing executed by the control unit 20 of the wireless device during communication and the control unit 20 of the spare wireless device in order to realize the above functions.
  • a process for communicating with the opposite wireless device on one or more communication lines is performed (step 100).
  • the hardware resources for securing the necessary communication line are reconfigured, and the data is transmitted / received using the secured communication line.
  • step 102 it is determined whether an increase or decrease in the communication line is required. As a result, when it is determined that the increase / decrease is required, the process of step 100 is executed again.
  • step 104 it is determined whether or not a failure has occurred in this wireless device. As a result, if no failure is found, the processes after step 100 are repeated in order to continue communication with the opposite wireless device.
  • step 106 the spare wireless device is notified of the occurrence of the failure. After that, the processes after step 100 are repeatedly executed.
  • the spare wireless device first, information such as the communication method and frequency band used in the main wireless device during communication is reflected in its own hardware resource (step 200). As a result, the spare wireless device is prepared with a line that duplicates the communication line used by the wireless device being communicated.
  • step 202 it is determined whether or not an abnormality in the wireless device during communication is detected. For example, if the operation of the CPU of the wireless device during communication is stopped, the usage rate of the CPU suddenly increases, or the memory usage rate of the wireless device during communication suddenly increases, this Abnormality detection is determined in the step.
  • step 202 If it is determined in step 202 that no abnormality is detected in the wireless device being communicated, then it is determined whether or not the wireless device being communicated has notified that a failure has occurred (step 204). As a result, if it is determined that the failure notification has not been received, it can be determined that it is not necessary to start communication with the spare wireless device. In this case, thereafter, the processes after step 200 are repeatedly executed.
  • step 202 if it is determined in step 202 that an abnormality in the wireless device being communicated is detected, or if it is determined in step 204 that a failure notification has been received from the wireless device being communicated, the main communication is performed.
  • a communication stop instruction is issued to the wireless device (206).
  • step 208 communication using a communication line in which the communication method or the like is duplicated is started (step 208).
  • the main wireless device stops communication.
  • the subject of communication is switched from the main wireless device to the spare wireless device. Since the communication method and frequency band do not change before and after the switching, the opposite wireless device can continue the communication as before without dealing with the switching.
  • the line control system of the present embodiment when a failure occurs in the wireless device during communication, the failure is instantaneously caused by switching the main body of communication from the main wireless device to the spare wireless device. The effect can be eliminated. Therefore, according to this system, it is possible to avoid the occurrence of packet loss even when the wireless device fails.
  • FIG. 4 is a diagram for explaining the configuration of the line control system of the present embodiment.
  • the line control system of the present embodiment includes four software defined radios 50-1 to 50-4 as in the case of the first embodiment.
  • the software defined radio 50-1 and the software defined radio 50-2 have a relationship between a main radio device and a spare radio device.
  • the software defined radio 50-3 and the software defined radio 50-4 also have a relationship between a main radio device and a spare radio device.
  • the spare wireless device includes communication lines 22a, 24a, 26a, 28a corresponding to the communication lines 22, 24, 26, 28 of the main wireless device.
  • the communication lines 22a, 24a, 26a, 28a can establish communication in the same communication method as the communication lines 22, 24, 26, 28, respectively, and in different frequency bands.
  • the software defined radio 50 when it is not necessary to distinguish between the four software defined radios, they are collectively referred to as the software defined radio 50 and the description will proceed.
  • the software defined radio 50 of this embodiment includes a control unit 52.
  • the control unit 52 is similar to the control unit 20 in the first embodiment in that it controls the FPGA 14, the AD / DA converter 16, and the RF front end unit 18. Further, the control unit 52 can realize the following functions in addition to realizing the same functions as the control unit 20.
  • the software defined radio 50-2 which is a spare radio device, recognizes the required frequency width for each of the communication methods used by the software defined radio 50-1 during communication. Then, for each communication method, a frequency band having the same width as the frequency band in use and capable of providing good line quality is scanned.
  • the power of the interference wave is lower than the determination threshold value, it is determined that the line quality is good.
  • the spare software defined radio 50-2 finds a frequency band that can provide good line quality, it notifies the opposite spare software defined radio 50-4 of the frequency band by a predetermined wireless communication method. .. By performing this process for each of the communication schemes, the two spare radios are different from the frequency band in use for each of the plurality of communication schemes used by the radio equipment in communication. It is ready to send and receive in the frequency band.
  • the frequency band used by the deteriorated communication line is affected by interference waves and fading. Judge that there is. Then, the communication on the deteriorated communication line is switched to the communication on the corresponding communication line in the spare wireless device.
  • the line 28 when deterioration of line quality is detected for the communication line 28 of the main wireless device, the line 28 is switched to the communication line 28a of the spare wireless device.
  • the communication line 28a is configured to be able to provide good line quality, and uses a frequency band different from that of the communication line 28. Therefore, when the communication line 28 is switched to the communication line 28a, the influence of line quality deterioration is instantly eliminated, and a state in which good communication can be provided is maintained.
  • two wireless devices having a preliminary relationship with the main device also have a function of monitoring each other's resources.
  • the software defined radio 50-1 which is the main wireless device can monitor the operating status of the CPU and resources of the software defined radio 50-2 which is a spare wireless device.
  • the spare software defined radio 50-2 can, on the contrary, monitor the resources of the main software defined radio 50-1.
  • one or more communication lines of the wireless device being communicated are switched to the communication line of the spare wireless device.
  • the software defined radio 50-2 detects the resource shortage of the software defined radio 50-1, for example, the communication line 28 is switched to the communication line 28a. If the software defined radio 50-1 runs out of resources, the software defined radio 50-3, which is the opposite radio device, may also run out of resources. Therefore, when the above switching is performed, the communication line 28 of the software defined radio 50-3 is also switched to the communication line 28a of the software defined radio 50-4. When this switching is performed, a part of the resources used for communication in the main wireless device is released, and the resource shortage can be solved.
  • FIG. 5 is a block diagram for explaining the elements configured inside the software defined radios 50-1 and 50-2 shown in FIG.
  • the configuration shown in FIG. 5 is the same as the configuration shown in FIG. 2, except that the device condition monitoring unit 36 and the frequency control unit 40 are replaced by the device condition monitoring unit 54 and the frequency control unit 56, respectively.
  • the same elements as those shown in FIG. 2 in FIG. 5 are designated by a common reference numeral, and the description thereof will be omitted or simplified.
  • the software defined radio 50-1 which is the main wireless device and the software defined radio 50-2 which is the spare wireless device have the same configuration and can function in the same manner.
  • the functions thereof will be described when the software defined radio 50-1 is in communication and the software defined radio 50-2 is a spare thereof.
  • the device status monitoring unit 54 monitors the status of the wireless device to which it belongs, and also monitors the status of the other wireless device that has a preliminary relationship with the main.
  • the device status monitoring unit 54 of the software defined radio 50-1 during communication monitors the deterioration of line quality for each communication line used by the radio device to which it belongs. As a result, when deterioration exceeding the determination threshold value is observed, a process for switching the deteriorated communication line to the communication line of the spare wireless device is performed.
  • the device status monitoring unit 54 of the spare software defined radio 50-2 monitors the resources of the software defined radio 50-1 during communication. Then, when a CPU shortage or a memory shortage of the wireless device during communication is detected, a process for switching the communication line used there to the communication line of the spare wireless device is performed.
  • the frequency control unit 40 of the software defined radio 50-1 during communication secures the frequency band necessary for establishing communication by the communication method in use.
  • the frequency control unit 40 of the spare software defined radio 50-2 sets a frequency band in which good line quality can be obtained, which is different from the frequency band in use for each of the communication methods used for communication. Secure.
  • FIG. 6 is a flowchart of processing executed by the control unit 52 of the main wireless device during communication and the control unit 52 of the spare wireless device in order to realize the above functions.
  • the same steps as those shown in FIG. 3 are designated by a common reference numeral, and the description thereof will be omitted or simplified.
  • step 110 in the main wireless device during communication, if it is determined in step 102 that the increase or decrease of the communication line has not occurred, then, in any of the communication lines used for communication, It is determined whether or not the line quality is deteriorated (step 110).
  • step 100 if no deterioration in line quality is observed, the processes after step 100 are repeated in order to continue communication in that state.
  • step 110 if any communication line is found to be deteriorated by the process of step 110, the spare wireless device is notified that the line quality has deteriorated (step 112). After that, the processes after step 100 are repeatedly executed.
  • step 200 after the information of the communication line used in the main wireless device is taken in, another available frequency band is searched (step 210). Specifically, here, for each of the communication methods used in the main wireless devices, another frequency band that is different from the frequency band used for communication and that can provide good line quality is searched for. To.
  • step 212 it is determined whether the resources of the wireless device being communicated are insufficient. For example, when the CPU operating rate or the memory usage rate of the wireless device during communication exceeds the determination threshold value, it is determined that the main software defined radio device 50-1 has a resource shortage.
  • step 212 If it is determined in step 212 that there is no resource shortage in the wireless device being communicated, then whether the wireless device being communicated has notified that the line quality has deteriorated for any of the communication lines. Determined (step 214). As a result, if it is determined that the notification of the deterioration of the line quality has not been received, it can be determined that it is not necessary to start the communication with the spare wireless device. In this case, thereafter, the processes after step 200 are repeatedly executed.
  • step 212 when the discrimination in step 212 is affirmed, and when the discrimination in step 214 is affirmed, one is set for the main wireless device during communication, the opposite main wireless device, and the spare wireless device. It is instructed to stop the communication on the above communication line (step 216). Specifically, when the resource shortage is affirmed in step 212, the communication stop on the line with the lowest line quality among the communication lines in use is instructed. If the notification of deterioration is affirmed in step 212, the communication stop on the communication line in which the deterioration is recognized is instructed.
  • step 2128 communication in a frequency band different from that used in the line instructed to stop communication is started (step 218).
  • the two main wireless devices during communication stop communication on the designated communication line.
  • the opposite spare radio device starts communication in the above-mentioned other frequency band.
  • the communication line of the main wireless device in which the quality has deteriorated is switched to the spare communication line that provides good line quality, and the good communication as before is continued.
  • the line control system of the present embodiment is a spare that provides good line quality when the quality of the communication line during communication deteriorates and when the wireless device during communication runs out of resources. Maintain a state in which good communication can be provided by utilizing the communication line of. Therefore, according to this system, it is possible to flexibly respond to changes in the communication environment in which the wireless device is placed and always effectively avoid the occurrence of packet loss.
  • FIG. 7 is a diagram for explaining the configuration of the line control system of the present embodiment.
  • the line control system of the present embodiment includes four software defined radios 60-1 to 60-4 as in the case of the first embodiment.
  • the software defined radio 60-1 and the software defined radio 60-2 have a relationship between a main radio device and a spare radio device.
  • the software defined radio 60-3 and the software defined radio 60-4 also have a relationship between a main radio device and a spare radio device.
  • the spare wireless device includes communication lines 22a, 24a, 26a, 28b corresponding to the communication lines 22, 24, 26, 28 of the main wireless device.
  • Each of the communication lines 22a, 24a, 26a can establish communication in the same communication method as each of the communication lines 22, 24, 26, and in a different frequency band.
  • the communication line 28b is configured to satisfy the following conditions under the same communication method as the communication line 28. 1. 1.
  • the communication lines 28 and 28b adopt the same communication method corresponding to adaptive modulation. 2.
  • the communication line 28b adopts a modulation method having a smaller number of values than the modulation method used in the communication line 28. 3.
  • the communication line 28b uses a frequency band wider than the frequency band used by the communication line 28 in order to secure the same transmission capacity as the communication line 28 with a small number of values.
  • the communication line 28 employs a QPSK (Quadrature Phase Shift Keying) modulation method in which the number of multivalues is four under a specific communication method.
  • the communication line 28b adopts a modulation method of BPSK (Binary Phase Shift Keying) having two multivalues under the same communication method, and is twice as wide as the frequency band used by the communication line 28. You are using a frequency band with.
  • the software defined radio 60 when it is not necessary to distinguish between the four software defined radios, they are collectively referred to as the software defined radio 60 and the description will proceed.
  • the functions of the software defined radio 60-1 will be described as a representative example of both.
  • the functions of the software defined radio 60-2 will be described as a representative example of both.
  • the software defined radio 60 of this embodiment includes a control unit 62.
  • the control unit 62 is similar to the control unit 20 in the first embodiment in that it controls the FPGA 14, the AD / DA converter 16, and the RF front end unit 18. Further, the control unit 62 can realize the following functions in addition to realizing the same functions as the control unit 20.
  • Both the main software defined radio 60-1 and the spare software defined radio 60-2 support a communication method capable of changing a multi-valued number by utilizing adaptive modulation.
  • the spare software defined radio 60-2 recognizes the required frequency width for each of the communication methods used by the software defined radio 60-1 during communication. In addition, it scans for frequencies that are different from the frequency band in use and that can provide good line quality. Here, for example, when the power of the interference wave is lower than the determination threshold value, it is determined that the line quality is good.
  • the spare software defined radio 60-2 determines whether a frequency band wider than the frequency band during communication can be secured among the good frequency bands found. If it is determined that a wide frequency bandwidth can be secured, preferentially select a communication line that uses a modulation method with a large number of multivalues to secure the frequency band required to reduce the number of multivalues. do.
  • the spare software defined radio 60-2 notifies the opposite software defined radio 60-4 of information on another frequency band secured and information on the modulation method to be adopted by a predetermined radio communication method. As a result, the spare software defined radios 60-2 and 60-4 are ready to transmit and receive in another frequency band.
  • the spare software defined radio 60-2 mainly switches the communication line when a communication line that can reduce the number of multiple values while ensuring the same transmission capacity by using a wide frequency band is prepared. Request to machine 60-1. As a result, the number of multi-values used for communication can be reduced as long as the frequency band allows.
  • the robustness of communication can be enhanced as compared with the case where the number of multi-values is fixed.
  • FIG. 8 is a block diagram for explaining the elements configured inside the software defined radios 60-1 and 60-2 shown in FIG. 7.
  • the device status monitoring unit 36, the communication method control unit 38, and the frequency control unit 40 are replaced by the device status monitoring unit 64, the communication method control unit 66, and the frequency control unit 68, respectively.
  • the configuration is the same as that shown in FIG.
  • the same elements as those shown in FIG. 2 in FIG. 8 are designated by a common reference numeral, and the description thereof will be omitted or simplified.
  • the software defined radio 60-1 which is the main wireless device and the software defined radio 60-2 which is the spare wireless device have the same configuration and can function in the same manner.
  • the functions thereof will be described when the software defined radio 60-1 is in communication and the software defined radio 60-2 is a spare thereof.
  • the device status monitoring unit 64 of the spare wireless device can communicate with a modulation method having a smaller number of values than the communication line being communicated, the device status monitoring unit 64 notifies the wireless device being communicated to that effect.
  • the device condition monitoring unit 64 of the wireless device during communication performs a process for switching the corresponding communication method to the spare wireless device.
  • the communication method control unit 66 selects a method to be used for communication from a plurality of methods prepared in advance. Further, in the spare wireless device, a communication method capable of communicating with a modulation method having a small number of multi-values is searched for. As a result, if a communication method satisfying the above conditions is found, that method is selected. The selected communication method is reflected in the hardware configuration of the software defined radio 60-2 and is held in the information holding unit 42.
  • the frequency control unit 68 secures the frequency band necessary for establishing communication with the communication method in use. When a communication method using a modulation method with a small number of values is selected for the spare wireless device, good communication is possible and a frequency bandwidth is secured so that the desired transmission capacity can be obtained by the modulation method. do.
  • FIG. 9 is a flowchart of processing executed by the control unit 62 of the main wireless device during communication and the control unit 62 of the spare wireless device in order to realize the above functions.
  • the same steps as those shown in FIG. 3 or 6 will be designated by a common reference numeral, and the description thereof will be omitted or simplified.
  • step 220 after searching for another frequency band that can provide good line quality in step 210, it is further determined whether a wide frequency band can be secured. Is done (step 220).
  • Step 222 if it is determined that a wide frequency band can be secured, it is determined whether one or more communication lines used in the main wireless device can be changed to a modulation method with a small number of values.
  • step 220 If it is determined in step 220 that a wide frequency band cannot be secured, it can be determined that the number of multiple values cannot be reduced while maintaining the transmission capacity. Further, if it is determined in step 222 that there is no communication line satisfying the condition, it can be determined that the number of multiple values cannot be reduced. Therefore, in these cases, the current processing cycle is terminated as it is in order to continue the current communication.
  • step 120 After it is determined in step 102 that the number of communication lines has not increased or decreased, it is determined whether or not an instruction to stop communication on a specific communication line is issued from the spare wireless device. Is done (step 120).
  • the current processing cycle is terminated as it is in order to continue the current communication.
  • the instruction to stop communication has been issued, the communication on the designated communication line is stopped (step 122).
  • the modulation method having a small number of multi-values is preferentially adopted, and the robustness of communication can be further enhanced as compared with the case of the first or second embodiment. ..
  • FIG. 10 is a diagram for explaining the configuration of the line control system of the present embodiment.
  • the line control system of the present embodiment includes four software defined radios 70-1 to 70-4 as in the case of the first embodiment.
  • the software defined radio 70-1 and the software defined radio 70-2 have a relationship between a main radio device and a spare radio device.
  • the software defined radio 70-3 and the software defined radio 70-4 also have a relationship between a main radio device and a spare radio device.
  • the spare wireless device includes communication lines 22a, 24a, 26a, 28c corresponding to the communication lines 22, 24, 26, 28 of the main wireless device.
  • Each of the communication lines 22a, 24a, 26a can establish communication in the same communication method as each of the communication lines 22, 24, 26, and in a different frequency band.
  • the communication line 28c adopts the same modulation method having the same number of values under the same communication method as the communication line 28, and uses a frequency band wider than the frequency band used by the communication line 28. do. As a result, the communication line 28c can secure a large transmission capacity as compared with the communication line 28.
  • the communication line 28 employs a QPSK modulation method in which the number of multiple values is four under a specific communication method.
  • the communication line 28c adopts the same QPSK modulation method under the same communication method, and uses a frequency band having twice the width of the frequency band used by the communication line 28.
  • the software defined radio 70 when it is not necessary to distinguish between the four software defined radios, they will be collectively referred to as the software defined radio 70 and the description will proceed.
  • the functions of the software defined radio 70-1 will be described as a representative example of both.
  • the functions of the software defined radio 70-2 will be described as a representative example of both.
  • the software defined radio 70 of this embodiment includes a control unit 72.
  • the control unit 72 is similar to the control unit 20 in the first embodiment in that it controls the FPGA 14, the AD / DA converter 16, and the RF front end unit 18. Further, the control unit 72 can realize the following functions in addition to realizing the same functions as the control unit 20.
  • control unit 72 is configured to realize the following functions. 1.
  • the software defined radio 70 can increase the transmission capacity by expanding the width of the frequency band in one or more communication lines.
  • the spare software defined radio 70-2 can search for a frequency band that can provide good line quality and secure a frequency band wider than the frequency band during communication.
  • the spare software defined radio 70-2 can secure a frequency band wider than the frequency band during communication, the communication line with insufficient transmission capacity is preferentially selected and replaced with the communication line. Secure a wide frequency band for.
  • the spare software defined radio 70-2 secures a wide frequency band
  • the spare software defined radio 70-2 notifies the opposite spare software defined radio 70-4 of the contents by a predetermined wireless communication method.
  • the spare software defined radios 70-2 and 70-4 are ready to transmit and receive in the extended frequency band.
  • the spare software defined radio 70-2 requests the main software defined radio 70-1 to switch to the communication line when the communication line using the wide frequency band is prepared.
  • the communication line having insufficient transmission capacity can be preferentially switched to the line having a large transmission capacity. Therefore, according to the system of the present embodiment, it is possible to further suppress the occurrence of packet loss as compared with the cases of the first to third embodiments.
  • FIG. 11 is a block diagram for explaining the elements configured inside the software defined radios 70-1 and 70-2 shown in FIG.
  • the device status monitoring unit 36, the communication method control unit 38, and the frequency control unit 40 are replaced by the device status monitoring unit 74, the communication method control unit 76, and the frequency control unit 78, respectively.
  • the configuration is the same as that shown in FIG.
  • the same elements as those shown in FIG. 2 in FIG. 11 are designated by a common reference numeral, and the description thereof will be omitted or simplified.
  • the software defined radio 70-1 which is the main wireless device and the software defined radio 70-2 which is the spare wireless device have the same configuration and can function in the same manner.
  • the functions of the software defined radio 70-1 during communication and the software defined radio 70-2 as a spare thereof will be described.
  • the device status monitoring unit 74 of the spare wireless device If the device status monitoring unit 74 of the spare wireless device can communicate in a frequency band wider than the communication line being communicated, the device status monitoring unit 74 notifies the wireless device being communicated to that effect.
  • the device condition monitoring unit 64 of the wireless device during communication Upon receiving the above notification from the spare wireless device, the device condition monitoring unit 64 of the wireless device during communication performs a process for switching the corresponding communication method to the spare wireless device.
  • the communication method control unit 76 selects a method to be used for communication from a plurality of methods prepared in advance. Further, in the spare wireless device, a communication method capable of increasing the transmission capacity by expanding the frequency bandwidth is searched for. As a result, if a communication method satisfying the above conditions is found, that method is selected. The selected communication method is reflected in the hardware configuration of the software defined radio 70-2 and is held in the information holding unit 42.
  • the frequency control unit 78 secures the frequency band necessary for establishing communication with the communication method in use. In the spare wireless device, a frequency band that is wider than the frequency band during communication and that enables good communication is further secured.
  • FIG. 12 is a flowchart of processing executed by the control unit 72 of the main wireless device during communication and the control unit 72 of the spare wireless device in order to realize the above functions.
  • the same steps as those shown in FIGS. 3, 6, or 9 are designated by a common reference numeral, and the description thereof will be omitted or simplified.
  • the frequency is used in one or more communication lines used in the main wireless device. It is determined whether the band width can be expanded (step 230).
  • Step 232 if it is determined that there is no communication line whose frequency band can be expanded, there is no room for expanding the frequency band width, so the current processing cycle is terminated as it is.
  • the spare wireless device starts communication on the communication line having the expanded frequency bandwidth through the process of step 224 (the process of step 224 is performed). Step 232).
  • the communication line having insufficient transmission capacity can be preferentially switched to the line using the wide frequency bandwidth. ..
  • the number of multi-values does not change, a large transmission capacity can be given to the communication after switching. Therefore, according to the system of the present embodiment, it is possible to effectively avoid the occurrence of packet loss due to insufficient transmission capacity.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un système de commande de ligne qui peut réduire les données de trafic à mettre au rebut au moyen d'une technologie sans fil logicielle. Selon la présente invention, une machine radio logicielle principale et une machine radio logicielle préliminaire sont préparées. Une unité de commande de la machine radio logicielle principale établit une communication au moyen d'une ou de plusieurs lignes de communication définies avec un schéma de communication et une bande de fréquence (étape 100). Lors de la détection d'une anomalie dans une ressource de la machine radio logicielle principale (étape 202), ou lors de la réception d'une notification d'erreur (étape 204), une unité de commande de la machine radio logicielle préliminaire commute la communication dans la machine radio logicielle principale en communication dans une ligne de communication préliminaire sur la base d'informations copiées (étape 208).
PCT/JP2020/034173 2020-09-09 2020-09-09 Système de commande de ligne, machine radio logicielle, procédé de commande de ligne et programme de commande de ligne WO2022054179A1 (fr)

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JP2022548300A JPWO2022054179A1 (fr) 2020-09-09 2020-09-09

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002330467A (ja) * 2001-04-27 2002-11-15 Matsushita Electric Ind Co Ltd 無線送信装置及び無線通信方法
WO2005122414A1 (fr) * 2004-06-14 2005-12-22 Matsushita Electric Industrial Co., Ltd. Dispositif de communication radio
JP2010045497A (ja) * 2008-08-11 2010-02-25 Hitachi Kokusai Electric Inc ソフトウェア無線機
JP2012231413A (ja) * 2011-04-27 2012-11-22 Hitachi Industrial Equipment Systems Co Ltd 無線装置および無線ネットワークシステム
JP2014222846A (ja) * 2013-05-14 2014-11-27 富士通株式会社 基地局装置、基地局装置におけるデータ送信方法、及び無線通信システム
JP2016213724A (ja) * 2015-05-12 2016-12-15 日本電気株式会社 送信システム、送信方法及びプログラム
JP2018074394A (ja) * 2016-10-28 2018-05-10 サイレックス・テクノロジー株式会社 無線基地局装置、無線通信システム、無線通信制御方法およびプログラム

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002330467A (ja) * 2001-04-27 2002-11-15 Matsushita Electric Ind Co Ltd 無線送信装置及び無線通信方法
WO2005122414A1 (fr) * 2004-06-14 2005-12-22 Matsushita Electric Industrial Co., Ltd. Dispositif de communication radio
JP2010045497A (ja) * 2008-08-11 2010-02-25 Hitachi Kokusai Electric Inc ソフトウェア無線機
JP2012231413A (ja) * 2011-04-27 2012-11-22 Hitachi Industrial Equipment Systems Co Ltd 無線装置および無線ネットワークシステム
JP2014222846A (ja) * 2013-05-14 2014-11-27 富士通株式会社 基地局装置、基地局装置におけるデータ送信方法、及び無線通信システム
JP2016213724A (ja) * 2015-05-12 2016-12-15 日本電気株式会社 送信システム、送信方法及びプログラム
JP2018074394A (ja) * 2016-10-28 2018-05-10 サイレックス・テクノロジー株式会社 無線基地局装置、無線通信システム、無線通信制御方法およびプログラム

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