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WO2025182095A1 - Dispositif de communication, procédé de mesure de qualité de communication, circuit de commande et support de stockage - Google Patents

Dispositif de communication, procédé de mesure de qualité de communication, circuit de commande et support de stockage

Info

Publication number
WO2025182095A1
WO2025182095A1 PCT/JP2024/007898 JP2024007898W WO2025182095A1 WO 2025182095 A1 WO2025182095 A1 WO 2025182095A1 JP 2024007898 W JP2024007898 W JP 2024007898W WO 2025182095 A1 WO2025182095 A1 WO 2025182095A1
Authority
WO
WIPO (PCT)
Prior art keywords
measurement
communication
communication device
user data
communication quality
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2024/007898
Other languages
English (en)
Japanese (ja)
Inventor
哲也 青山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2024/007898 priority Critical patent/WO2025182095A1/fr
Publication of WO2025182095A1 publication Critical patent/WO2025182095A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/06—Testing, supervising or monitoring using simulated traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]

Definitions

  • This disclosure relates to a communication device, a communication quality measurement method, a control circuit, and a storage medium applied to mobile communications.
  • the radio quality and communication quality fluctuate when the position of the communication device changes as the train or other vehicle equipped with the communication device moves. Even if the position of the communication device does not change, the radio quality and communication quality may fluctuate due to changes in the surrounding environment or the influence of communications from other communication devices. For this reason, the communication device measures the radio quality and communication quality as appropriate, and, for example, if it detects a decline in communication quality, it performs processing to restore communication quality.
  • a communication device can measure communication quality such as transmission delay, throughput, and packet loss rate by sending and receiving measurement packets with an opposing communication device.
  • Patent Document 1 discloses a wireless communication system that sends and receives packets with timestamps added to the header as communication quality measurement data, and measures packet transfer delay time, throughput, fluctuations, etc. based on the timestamps on the packet receiving side.
  • Patent Document 1 fails to take into account the impact of adding communication quality measurement data to packets. As a result, if communication quality is measured using the method described in Patent Document 1 while user data is being transferred, the transmission and reception of packets for communication quality measurement increases the bandwidth used on the communication line and the number of packet transfers, increasing the network load and potentially affecting the transfer of user data.
  • the present disclosure has been made in light of the above, and aims to provide a communication device that can measure communication quality while minimizing the impact on user data transfer.
  • the communications device disclosed herein is characterized by comprising: a data transfer unit that is connected to a communications line and transfers application user data to the communications line; a communications quality measurement unit that measures the communications quality of the communications line; and a measurement condition determination unit that determines a method for transmitting the measurement data based on the size of the measurement data transmitted by the communications quality measurement unit when measuring communications quality, the user data generation status, and the maximum transmission size of the communications line.
  • the communication device disclosed herein has the advantage of being able to measure communication quality while minimizing the impact on user data transfer.
  • FIG. 1 is a diagram illustrating an application example of a communication device according to a first embodiment.
  • FIG. 1 is a diagram illustrating an outline of an operation of a system to which a communication device according to a first embodiment is applied.
  • FIG. 1 illustrates an example of a configuration of a communication system and a communication device according to a first embodiment.
  • FIG. 1 is a diagram illustrating an example of the configuration of transmission data on a path when a communication device according to a first embodiment transmits measurement data together with user data;
  • FIG. 1 is a diagram illustrating an example of measurement information transmitted and received by a communication device according to a first embodiment for measuring communication quality.
  • FIG. 1 is a diagram illustrating an application example of a communication device according to a first embodiment.
  • FIG. 1 is a diagram illustrating an outline of an operation of a system to which a communication device according to a first embodiment is applied.
  • FIG. 1 illustrates an example of a configuration of a communication system and a communication device according to
  • FIG. 1 is a diagram illustrating an example of a configuration of transmission data when a communication device according to a first embodiment transmits user data alone
  • FIG. 10 is a diagram illustrating an example of a configuration of transmission data when the communication device according to the first embodiment transmits measurement data alone
  • 1 is a flowchart illustrating an example of an operation of a communication device according to a first embodiment to transmit measurement information.
  • FIG. 10 is a diagram illustrating an example of measurement response information transmitted and received by a communication device according to a first embodiment for measuring communication quality. 10 is a flowchart illustrating an example of an operation of the communication device according to the first embodiment to transmit measurement response information.
  • FIG. 10 is a diagram illustrating an example of a configuration of transmission data when a communication device according to a first embodiment transmits user data alone
  • FIG. 10 is a diagram illustrating an example of a configuration of transmission data when the communication device according to the first embodiment transmits measurement data alone
  • 1 is a flowchart illustrating an example of an operation of a
  • FIG. 1 is a sequence diagram illustrating an example of an overall operation (measurement request operation) of a communication system according to a first embodiment.
  • FIG. 1 is a sequence diagram illustrating an example of an overall operation (measurement response operation) of a communication system according to a first embodiment.
  • FIG. 1 is a diagram illustrating an example of a hardware configuration of a communication device according to a first embodiment.
  • FIG. 10 is a diagram illustrating another example of a hardware configuration of the communication device according to the first embodiment.
  • FIG. 10 is a diagram showing an example of a minimum measurement time used in a determination process by a measurement condition determination unit according to a second embodiment;
  • FIG. 11 is a diagram showing an example of a minimum measurement time used in a determination process by a measurement condition determination unit according to a third embodiment.
  • FIG. 13 is a diagram showing an example of a minimum measurement time used in the determination process by the measurement condition determination unit according to the fourth embodiment.
  • FIG. 20 is a diagram showing an example of a minimum measurement time used in the determination process by the measurement condition determination unit according to the fifth embodiment;
  • FIG. 20 is a diagram showing an example of a minimum measurement time used in the determination process by the measurement condition determination unit according to the sixth embodiment.
  • FIG. 1 is a diagram illustrating an application example of a communication device according to a first embodiment.
  • the communication device according to the first embodiment is, for example, communication devices 1 and 2 applied to a railway system as shown in FIG. 1 .
  • the communication devices 1 and 2 are, for example, communication devices compatible with a fifth-generation mobile communication system (hereinafter referred to as a 5G (5th Generation) system).
  • the communication device 1 is mounted on a train 10, which is a mobile object.
  • the communication device 2 is installed on the ground side, specifically, in a station, a communication equipment room, a control center, or the like.
  • the communication device 1 is connected to a 5G terminal 5 that transmits and receives wireless signals to and from a 5G base station 4, which is a base station of the 5G system.
  • the 5G base station 4 is connected to a 5G control device 3 that forms a core network of the 5G system.
  • the communication device 2 is connected to the 5G control device 3. Note that, although there are other network devices that form the core network of the 5G system besides the 5G control device 3, they are not illustrated in FIG. 1 .
  • the communication device 1 may be referred to as an on-board communication device, and the communication device 2 may be referred to as a ground communication device.
  • the communication device 1 communicates with the communication device 2 via the 5G terminal 5, the 5G base station 4, and the 5G control device 3.
  • FIG. 2 is a diagram showing an overview of the operation of a system to which the communication device according to the first embodiment is applied.
  • FIG. 3 is a diagram showing an example configuration of a communication system 100 and communication devices 1 and 2 according to the first embodiment.
  • Communication device 1 includes a data transfer unit 11, a communication quality measurement unit 12, a measurement condition determination unit 13, and a storage unit 14.
  • Communication device 2 includes a data transfer unit 21, a communication quality measurement unit 22, a measurement condition determination unit 23, and a storage unit 24. Note that FIG. 3 omits the 5G control device 3, 5G base station 4, and 5G terminal 5 shown in FIGS. 1 and 2.
  • Data transfer units 11 and 21 transfer user data generated by applications.
  • Communication quality measurement units 12 and 22 measure the communication quality for each of n communication lines (n is an integer greater than or equal to 1) over which communication device 1 and communication device 2 communicate.
  • Measurement condition determination units 13 and 23 determine for each communication line whether the specified measurement conditions are met.
  • Storage units 14 and 24 store the measurement conditions used when measuring communication quality and the communication quality measurement results.
  • communication devices 1 and 2 measure communication quality.
  • Communication devices 1 and 2 send and receive measurement data for measuring communication quality, and determine the communication quality from the results of sending and receiving the measurement data.
  • communication devices 1 and 2 change the method of sending the measurement data depending on the user data generation status, etc. Specifically, when no user data is being generated, i.e., when there is no user data to transfer, communication devices 1 and 2 send the measurement data alone.
  • communication devices 1 and 2 selectively send the measurement data together with the user data or send the measurement data separately from the user data, depending on the size of the user data and measurement data to be transferred.
  • FIG. 4 is a diagram showing an example of the structure of transmission data on a route when communication devices 1 and 2 according to the first embodiment transmit measurement data together with user data.
  • the on-board application is an application that transmits and receives user data via an on-board communication device corresponding to communication device 1 shown in FIGS. 1 to 3
  • the ground application is an application that transmits and receives user data via a ground communication device corresponding to communication device 2 shown in FIGS. 1 to 3.
  • an on-board communication device transmits measurement information, which is measurement data, to a wayside communication device
  • the on-board communication device receives a data packet containing user data from an on-board app, inserts the measurement information into the data packet, and forwards it to the 5G terminal.
  • the 5G terminal adds PDU (Protocol Data Unit) layer information and 5G-AN (Access Network) layer information to the data packet received from the on-board communication device, and forwards it to the 5G base station.
  • PDU Protocol Data Unit
  • 5G-AN Access Network
  • the 5G control device When the 5G control device receives a data packet from the 5G base station, it removes the 5G-AN layer information from the received data packet, then adds GTP-U layer, UDP/IP layer, Layer 2 (L2), and Layer 1 (L1) information and forwards it.
  • the wayside communication device receives a data packet with the same configuration as when it was forwarded by the on-board communication device, extracts the measurement information from the received data packet, and forwards it to the wayside application.
  • the configuration of the transmitted data is also the same when the wayside communication device transmits measurement information to the on-board communication device.
  • the measurement information transmitted and received between the on-board communication device and the wayside communication device varies depending on the type of communication quality being measured (measurement content).
  • An example of the measurement information is shown in Figure 5.
  • Figure 5 is a diagram showing an example of the measurement information transmitted and received by communication devices 1 and 2 according to the first embodiment for measuring communication quality.
  • communication devices 1 and 2 when measuring packet loss, transmission delay, or jitter (transmission fluctuation) as communication quality, use the sequence number as an element of the measurement information. Furthermore, when measuring throughput as communication quality, communication devices 1 and 2 use the transmission time of the measurement information and the size of the measurement information as elements of the measurement information. Dummy measurement data may also be included in the elements of the measurement information. For example, when measurement information is transmitted separately from user data, dummy measurement data may also be included in the elements of the measurement information. When measuring the reception interval as communication quality, it is not necessary to transmit measurement information.
  • the maximum transfer size shown in Figure 4 is the maximum data size that can be transmitted in a single packet on the communication line between the on-board communication device and the wayside communication device, i.e., the maximum size of data that can be included in a packet. If the data size becomes larger than the maximum transfer size, packet splitting occurs. In other words, the on-board communication device splits the data into two pieces and transmits the two pieces of data in two packets. Packet splitting occurs if the total size of the user data and measurement information (the "size of user data + measurement information" shown in the figure) is larger than the maximum transfer size.
  • the maximum transfer size is set in advance for each communication line. Data transmission and reception in the configuration shown in Figure 4 is performed when the total size of the user data and measurement information is equal to or less than the maximum transfer size.
  • FIGS. 6 and 7 are diagrams showing an example of the structure of transmission data on a path when communication devices 1 and 2 according to the first embodiment transmit measurement data separately from user data.
  • FIG. 6 shows an example of the structure of transmission data when communication devices 1 and 2 according to the first embodiment transmit user data alone
  • FIG. 7 shows an example of the structure of transmission data when communication devices 1 and 2 according to the first embodiment transmit measurement data alone.
  • the transmission data exchanged between the on-board communication device and the wayside communication device has the same structure as the transmission data shown in Figure 4, with the measurement information removed.
  • the transmission data exchanged between the on-board communication device and the wayside communication device has a configuration in which the user data exchanged between the on-board application and the wayside application has been removed from the transmission data shown in Figure 4.
  • FIG. 8 is a flowchart showing an example of the operation of the communication device 1 according to the first embodiment to transmit measurement information.
  • the communication device 1 first checks whether user data has been generated (step S11). That is, the communication device 1 checks whether there is user data generated by the above-mentioned on-board app that the data transfer unit 11 is holding to transfer to the 5G terminal 5; in other words, whether the data transfer unit 11 is holding user data that is waiting to be transferred to the communication line.
  • the communication device 1 checks whether the specified minimum measurement time has elapsed (Step S12). This check is performed by the measurement condition determination unit 13.
  • the minimum measurement time is the minimum value of the interval between transmissions of measurement information, and is stored in the memory unit 14 as a measurement condition.
  • the measurement condition determination unit 13 compares the time elapsed since the communication device 1 started operation, or the time elapsed since the previous transmission of measurement information, with the minimum measurement time. Note that the determination of whether the minimum measurement time has elapsed may be omitted between the time the communication device 1 starts operation and the first transmission of measurement information.
  • the measurement condition determination unit 13 checks whether the size condition is met (step S13). Specifically, the measurement condition determination unit 13 checks whether the total size of the generated user data and measurement information is equal to or less than the maximum transfer size described above. The maximum transfer size is stored in the storage unit 14 as a measurement condition. If the size condition is met (step S13: Yes), the measurement condition determination unit 13 notifies the communication quality measurement unit 12 that the size condition is met, and the communication quality measurement unit 12 generates measurement information and adds it to the user data (step S14).
  • the data transfer unit 11 transfers the user data with the measurement information added, i.e., a data packet including the measurement information and the user data, to the 5G terminal 5 (step S19).
  • the measurement information generated by the communication quality measurement unit 12 differs depending on the type of communication quality being measured (measurement content), as described using FIG. 5.
  • the data packet transferred to the 5G terminal 5 reaches the communication device 2 via the 5G base station 4 and the 5G control device 3.
  • step S12 determines whether the minimum measurement time has not elapsed. i.e., if the "minimum measurement time ⁇ elapsed time" condition is not met (step S12: No).
  • the measurement condition determination unit 13 notifies the data transfer unit 11 that the user data will be transferred alone, and the data transfer unit 11 transfers the user data without measurement information, i.e., a data packet containing only the user data, to the 5G terminal 5 (step S19).
  • the measurement condition determination unit 13 checks whether the specified maximum measurement time has elapsed (step S15).
  • the maximum measurement time is the maximum interval between transmissions of measurement information, and is stored in the memory unit 14 as a measurement condition. Note that the maximum measurement time is set to a value greater than the minimum measurement time described above.
  • step S15 If the maximum measurement time has elapsed, i.e., if "maximum measurement time ⁇ elapsed time" is true (step S15: Yes), the measurement condition determination unit 13 notifies the communication quality measurement unit 12 that the maximum measurement time has elapsed, i.e., that measurement information will be transmitted alone, and the communication quality measurement unit 12 generates only the measurement information (step S16) and outputs it to the data transfer unit 11.
  • the data transfer unit 11 transfers a data packet containing only the measurement information input from the communication quality measurement unit 12 to the 5G terminal 5 (step S19).
  • step S15 if the maximum measurement time has not elapsed, i.e., if the condition "maximum measurement time ⁇ elapsed time" is not true (step S15: No), the communication device 1 returns to step S11 and repeats the processing of steps S11 to S19 described above. Furthermore, after transferring either or both of the user data and the measurement information in step S19, the communication device 1 returns to step S11 and repeats the processing of steps S11 to S19 described above.
  • the measurement condition determination unit 13 checks whether the above-mentioned maximum measurement time has elapsed (step S17). If the maximum measurement time has elapsed (step S17: Yes), the measurement condition determination unit 13 notifies the communication quality measurement unit 12 and the data transfer unit 11 that the measurement information will be transmitted separately from the user data.
  • the communication quality measurement unit 12 generates the measurement information (step S18) and outputs it to the data transfer unit 11.
  • the data transfer unit 11 transmits a data packet containing only the measurement information input from the communication quality measurement unit 12 to the 5G terminal 5, and also transfers a data packet containing only the user data to the 5G terminal 5 (step S19).
  • step S17 if the maximum measurement time has not elapsed (step S17: No), the measurement condition determination unit 13 notifies the data transfer unit 11 that the user data will be transferred alone, and the data transfer unit 11 transfers the data packet containing only the user data to the 5G terminal 5 (step S19). After transferring only the user data in step S19, or after transferring the user data and transmitting the measurement information separately, the communication device 1 returns to step S11 and repeats the processing of steps S11 to S19 described above.
  • Communication device 2 which receives measurement information from communication device 1, returns information corresponding to the received measurement information as measurement response information. Just as when communication device 1 sends response information, communication device 2 returns measurement response information to communication device 1 together with the user data, or separately, depending on the user data generation status, the size of the generated user data, and the size of the measurement response information to be returned.
  • the measurement response information that communication device 2 returns to communication device 1 varies depending on the type of communication quality being measured (measurement content).
  • An example of measurement response information is shown in Figure 9.
  • Figure 9 is a diagram showing an example of measurement response information that communication devices 1 and 2 according to the first embodiment send and receive to measure communication quality.
  • communication device 2 when measuring packet loss as communication quality, communication device 2 returns the reception sequence number, which is the sequence number of the received packet, to communication device 1 as measurement response information.
  • reception sequence number which is the sequence number of the received packet
  • communication device 2 When measuring transmission delay or jitter as communication quality, communication device 2 returns the sequence number of the received packet and the processing time from receiving the measurement information to generating the measurement response information to communication device 1 as measurement response information.
  • throughput communication quality
  • communication device 2 returns the measurement results of the throughput to communication device 1 as measurement response information.
  • communication device 2 when measuring the reception interval of data packets as communication quality, communication device 2 returns the measurement results of the reception interval to communication device 1 as measurement response information.
  • Communication device 2 measures communication quality corresponding to each measurement content shown in FIG. 9 using a known method. Communication quality is measured, for example, by communication quality measurement unit 22.
  • FIG. 10 is a flowchart showing an example of the operation of the communication device 2 according to the first embodiment to transmit measurement response information.
  • the communication device 2 first checks whether user data has been generated (step S21). That is, the communication device 2 checks whether there is user data generated by the above-mentioned ground application that the data transfer unit 21 is holding to transfer to the 5G control device 3; in other words, whether the data transfer unit 21 is holding user data that is waiting to be transferred to the communication line.
  • Step S21 If user data has been generated (Step S21: Yes), communication device 2 checks whether the above measurement information has been received from communication device 1 (Step S22).
  • the measurement condition determination unit 23 checks whether the size condition is met (Step S23). Specifically, the measurement condition determination unit 23 checks whether the total size of the generated user data and the measurement response information is equal to or less than the maximum transfer size described above. The maximum transfer size is stored in the storage unit 24 as a measurement condition. If the size condition is met (Step S23: Yes), the measurement condition determination unit 23 notifies the communication quality measurement unit 22 that the size condition is met, and the communication quality measurement unit 22 generates measurement response information and adds it to the user data (Step S24).
  • the data transfer unit 21 transfers the user data with the measurement response information added, i.e., a data packet including the measurement response information and the user data, to the 5G control device 3 (Step S30).
  • the measurement response information generated by the communication quality measurement unit 22 differs depending on the type of communication quality being measured (measurement content), as described using FIG. 9.
  • the data packet transferred to the 5G control device 3 reaches the communication device 1 via the 5G base station 4 and the 5G terminal 5.
  • step S22 if measurement information has not been received (step S22: No), the measurement condition determination unit 23 notifies the data transfer unit 21 that it will transfer the user data alone, and the data transfer unit 21 transfers the user data without measurement response information, i.e., a data packet containing only the user data, to the 5G control device 3 (step S30).
  • the measurement condition determination unit 23 checks whether measurement information has been received (step S25). If measurement information has been received (step S25: Yes), the measurement condition determination unit 23 checks whether a specified maximum response transmission time has elapsed (step S26). The maximum response transmission time is the maximum time from receiving measurement information to transmitting measurement response information, and is stored in the memory unit 24 as a measurement condition. The measurement condition determination unit 23 compares the elapsed time from receiving measurement information from the communication device 1 with the maximum response transmission time.
  • step S26 If the maximum response transmission time has elapsed, i.e., if "maximum response transmission time ⁇ elapsed time" is true (step S26: Yes), the measurement condition determination unit 23 notifies the communication quality measurement unit 22 that the maximum response transmission time has elapsed, and the communication quality measurement unit 22 generates only measurement response information (step S27) and outputs it to the data transfer unit 21.
  • the data transfer unit 21 transfers a data packet containing only the measurement response information input from the communication quality measurement unit 22 to the 5G control device 3 (step S30). In this way, by configuring the system to transfer a data packet containing only the measurement response information when the maximum response transmission time has elapsed, it is possible to increase the frequency at which measurement response information is added to user data and transferred. This reduces the number of times packets are sent and received just for communication quality measurement, preventing an increase in network load.
  • step S25 if measurement information has not been received (step S25: No), and if the maximum response transmission time has not elapsed, i.e., if "maximum response transmission time ⁇ elapsed time" does not hold (step S26: No), the communication device 2 returns to step S21 and repeats the processing of steps S21 to S30 described above. Furthermore, after transferring either or both of the user data and the measurement response information in step S30, the communication device 2 returns to step S21 and repeats the processing of steps S21 to S30 described above.
  • the measurement condition determination unit 23 checks whether the above-mentioned maximum response transmission time has elapsed (step S28). If the maximum response transmission time has elapsed (step S28: Yes), the measurement condition determination unit 23 notifies the communication quality measurement unit 22 and the data transfer unit 21 that the measurement response information will be transmitted separately from the user data. The communication quality measurement unit 22 generates measurement response information (step S29) and outputs it to the data transfer unit 21.
  • the data transfer unit 21 transmits a data packet containing only the measurement response information input from the communication quality measurement unit 22 to the 5G terminal 5, and transfers a data packet containing only the user data to the 5G terminal 5 (step S30).
  • the measurement condition determination unit 23 notifies the data transfer unit 21 that the user data will be transferred alone, and the data transfer unit 21 transfers a data packet containing only the user data to the 5G terminal 5 (step S30).
  • the communication device 1 After transferring only the user data in step S30, and after transferring the user data and transmitting the measurement response information separately, the communication device 1 returns to step S21 and repeats the processes of steps S21 to S30 described above.
  • FIGS. 11 and 12 are sequence diagrams showing an example of the overall operation of the communication system 100 according to the first embodiment.
  • the sequence diagram in FIG. 11 shows the first half of the overall operation, specifically, the measurement request operation for transmitting and receiving measurement information for measuring communication quality.
  • the on-board communication device transmits the above-mentioned measurement information
  • the track-side communication device transmits the above-mentioned measurement response information.
  • Steps S50 to S61 in Figure 11 show the measurement request operation in which the on-board communication device transmits measurement information to the wayside communication device.
  • Steps S71 to S81 in Figure 12 show the measurement response operation in which the wayside communication device transmits measurement response information to the on-board communication device.
  • the on-board communication device selects a transmission method for the user data and the measurement information based on the relationship between the time ⁇ t1 and the minimum measurement time, and the relationship between the size of the user data, the size of the measurement information, and the maximum transfer size.
  • the on-board communication device generates measurement information (step S51), attaches it to the user data, and transmits it to the trackside communication device (step S52).
  • the trackside communication device removes the measurement information attached to the received user data (step S53) and forwards the user data to the trackside application (step S59).
  • step S54 the on-board communication device generates measurement information
  • step S55 and S56 the on-board communication device transmits the user data and measurement information separately to the trackside communication device.
  • the trackside communication device forwards the user data received in step S57 to the trackside application (step S59).
  • step S59 the on-board communication device transmits only user data to the trackside communication device.
  • the trackside communication device transfers the user data received in steps S57 and S58 to the trackside application (step S59). Furthermore, if (2) there is no user data to transfer, and (2-1) the time ⁇ t2 from the previous measurement information transmission by the on-board communication device (step S50) to the present is greater than the maximum measurement time ( ⁇ t2 > maximum measurement time), the on-board communication device generates measurement information (step S60) and transmits only the measurement information to the trackside communication device (step S61).
  • Figures 11 and 12 omit the operation of the wayside communication device when it receives the previous measurement information from the on-board communication device in step S50.
  • the ground communication device selects a method for transmitting the user data and the measurement response information based on the relationship between time ⁇ t3 and the maximum response transmission time, and the relationship between the size of the user data, the size of the measurement response information, and the maximum transfer size.
  • the trackside communication device generates measurement response information (step S71), attaches it to the user data, and transmits it to the on-board communication device (step S72).
  • the on-board communication device removes the measurement response information attached to the received user data (step S73) and forwards the user data to the on-board application (step S79).
  • the trackside communication device determines whether (3-1-2) the size condition is not met, and (3-1-2-1) time ⁇ t3 > maximum response transmission time.
  • the trackside communication device generates measurement response information (step S74) and transmits the user data and measurement response information separately to the on-board communication device (steps S75 and S76).
  • the trackside communication device transmits only the user data to the on-board communication device (step S77).
  • the on-board communication device transfers the user data received in steps S75 and S77 to the on-board app (step S79).
  • the trackside communication device Furthermore, (4) if there is no user data to transfer, and (4-1) if measurement information has already been received, or (4-1-1) if the time ⁇ t4 from the reception of the measurement information (step S52, S56, or S61) to the present is greater than the maximum response transmission time ( ⁇ t4 > maximum response transmission time), the trackside communication device generates measurement response information (step S80) and transmits only the measurement response information to the on-board communication device (step S81).
  • the communication quality measurement unit 22 of the wayside communication device that receives measurement information from the on-board communication device performs the following processing depending on the content of the communication quality measurement and generates measurement response information.
  • the communication quality measurement unit 22 retains the sequence number included in the received measurement information.
  • the communication quality measurement unit 22 holds the sequence number included in the received measurement information.
  • the communication quality measurement unit 22 also counts the processing time (Tb) from receiving the measurement information to generating the measurement response information.
  • the communication quality measurement unit 22 calculates the throughput according to the following formula (1) based on the reception time of the measurement information, the transmission time included in the received measurement information, and the size of the received measurement information.
  • Throughput Size / (Received time - Transmitted time) (1)
  • the communication quality measurement unit 22 calculates the reception interval of the measurement information based on the reception time of the measurement information.
  • the communication quality measurement unit 12 of the on-board communication device which receives the measurement response information from the trackside communication device, performs the following processing depending on the content of the communication quality measurement to evaluate the communication quality.
  • the communication quality measurement unit 12 checks the continuity of the sequence numbers included in the received measurement response information to calculate the packet loss rate from the number of lost packets, and records this in the memory unit 14 as the communication quality evaluation result.
  • the communication quality measurement unit 12 measures the time (Ta) from sending the corresponding measurement information to receiving the measurement response information.
  • the communication quality measurement unit 12 also acquires the processing time (Tb) from receiving the measurement information to generating the measurement response information, which is included in the received measurement response information, and calculates the transmission delay (Ta-Tb) based on the times Ta and Tb, and records this in the storage unit 14 as the communication quality evaluation result.
  • the communication quality measurement unit 12 upon receiving measurement response information, measures the time (Ta) from sending the corresponding measurement information to receiving the measurement response information.
  • the communication quality measurement unit 12 also acquires the processing time (Tb) from receiving the measurement information to generating the measurement response information, which is included in the received measurement response information, and calculates the transmission delay (Ta-Tb) based on the times Ta and Tb, and records (accumulates) this in the memory unit 14.
  • the communication quality measurement unit 12 then calculates jitter based on the multiple transmission delays accumulated in the memory unit 14, and records this in the memory unit 14 as the communication quality evaluation result.
  • the communication quality measurement unit 12 records the throughput measurement result included in the received measurement response information in the storage unit 14 as the communication quality evaluation result.
  • the communication quality measurement unit 12 records the reception interval measurement result included in the received measurement response information in the storage unit 14 as the communication quality evaluation result.
  • the operation has been described when on-board communication device 1 transmits measurement information, and ground communication device 2 receives the measurement information and returns measurement response information; however, the operation is similar when ground communication device 2 transmits measurement information, and on-board communication device 1 receives the measurement information and returns measurement response information.
  • communication quality may be measured by both communication devices 1 and 2, or by just one of them. When only one of communication devices 1 or 2 measures communication quality, communication device 1 or 2 that measured the communication quality may notify the opposing communication device of the measurement result as necessary.
  • Figure 13 is a diagram showing an example of the hardware configuration of communication devices 1 and 2 according to the first embodiment. Since the hardware configurations of communication devices 1 and 2 are similar, the following description will be given using communication device 1 as an example.
  • the communication device 1 is composed of a memory 91, a processor 92, a power supply circuit 93, an application interface 95, and a communication interface 94.
  • the memory 91 may be, for example, a non-volatile or volatile semiconductor memory such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable ROM), or EEPROM (Electrically EPROM).
  • the processor 92 may be, for example, a CPU (Central Processing Unit), processing unit, arithmetic unit, microprocessor, microcomputer, or DSP (Digital Signal Processor).
  • the power supply circuit 93 is an electronic circuit that generates power to drive the processor 92. The power supply circuit 93 may also supply power to each part of the communication device 1 other than the processor 92.
  • the communication interface 94 is connected to the 5G terminal 5 and is a circuit that performs communication processing with the communication device 2 via the 5G terminal 5.
  • the application interface 95 is a circuit that exchanges user data with the on-board app.
  • the data transfer unit 11 of the communication device 1 shown in FIG. 3 is realized by the communication interface 94 and the application interface 95.
  • the storage unit 14 shown in FIG. 3 is realized by the memory 91.
  • the communication quality measurement unit 12 and measurement condition determination unit 13 shown in FIG. 3 are realized by the processor 92 executing programs for operating these units.
  • the functions of the communication quality measurement unit 12 and measurement condition determination unit 13 are written as programs and stored in memory 91.
  • the processor 92 realizes the functions of the communication quality measurement unit 12 and measurement condition determination unit 13 by reading and executing the programs stored in memory 91.
  • This program can also be said to cause a computer to execute the procedures or methods of the communication quality measurement unit 12 and measurement condition determination unit 13.
  • the memory 91 is also used as temporary memory when the processor 92 executes various processes.
  • the programs for operating the communication quality measurement unit 12 and measurement condition determination unit 13 stored in memory 91 may be provided to users of the communication device 1, for example, in a form written to a storage medium such as a CD (Compact Disc)-ROM or a DVD (Digital Versatile Disc)-ROM, or may be provided via a communication network.
  • a storage medium such as a CD (Compact Disc)-ROM or a DVD (Digital Versatile Disc)-ROM, or may be provided via a communication network.
  • Figure 13 shows the hardware configuration for implementing communication devices 1 and 2 using general-purpose memory 91 and processor 92, but communication devices 1 and 2 can also be implemented using dedicated processing circuits instead of memory 91 and processor 92.
  • FIG. 14 is a diagram showing another example of the hardware configuration of communication devices 1 and 2 according to the first embodiment.
  • the memory 91 and processor 92 shown in FIG. 13 are replaced with a dedicated processing circuit 96.
  • the processing circuit 96 is a single circuit, a composite circuit, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a circuit that combines these.
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • communication device 1 It is also possible to implement some of the functions of the communication quality measurement unit 12 and measurement condition determination unit 13 of communication device 1 using a dedicated processing circuit equivalent to processing circuit 96 shown in FIG. 14, and the remainder using a general-purpose memory and processor equivalent to memory 91 and processor 92 shown in FIG. 13. The same applies to communication device 2.
  • communication devices 1 and 2 when communication devices 1 and 2 according to this embodiment transmit measurement data (measurement information, measurement response information) to a peer communication device to measure communication quality, they determine the transmission method based on the occurrence status of the user data to be transmitted to the peer communication device, the size of the measurement data, and the size of the generated user data. For example, when transmitting measurement information, communication devices 1 and 2 attach the measurement information to the user data and transmit it if the minimum measurement time, which indicates the minimum interval between transmissions of measurement information, has elapsed at the time the user data is generated and the sum of the size of the user data and the size of the measurement information is less than the maximum transfer size set for the communication line being used.
  • Communication devices 1 and 2 can transmit and receive measurement data and measure communication quality with minimal impact on user data transfer.
  • Embodiment 2 Next, a communication device according to a second embodiment will be described.
  • the configuration of the communication device according to the second embodiment is the same as that of the first embodiment (see FIG. 3), but part of the operation of the measurement condition determination unit is different from that of the first embodiment. Therefore, in this embodiment, the description of the parts common to the first embodiment will be omitted, and only the operation of the measurement condition determination units 13 and 23 that perform operations different from those of the first embodiment will be described.
  • the on-board communication device 1 generates measurement information and transmits it to the on-board communication device 2.
  • the measurement condition determination unit 13 of the communication device 1 according to the second embodiment is capable of setting a different value for the minimum measurement time used when determining whether the minimum measurement time has elapsed in step S12 shown in FIG. 8 for each communication quality measurement.
  • the measurement condition determination unit 13 according to the second embodiment uses the minimum measurement time corresponding to the communication quality measurement from among multiple minimum measurement times prepared in advance to perform the process of determining whether the minimum measurement time has elapsed.
  • Figure 15 shows examples of multiple minimum measurement times that have been prepared in advance.
  • Figure 15 shows an example of minimum measurement times that the measurement condition determination unit 13 according to the second embodiment uses in the determination process.
  • the minimum measurement time used by the measurement condition determination unit 13 when measuring packet loss is T1
  • the minimum measurement time used by the measurement condition determination unit 13 when measuring transmission delay is T2
  • the minimum measurement time used by the measurement condition determination unit 13 when measuring jitter is T3
  • the minimum measurement time used by the measurement condition determination unit 13 when measuring transmission speed is T4.
  • two or more of T1 to T4 may be set to the same value.
  • the measurement condition determination unit 13 may further set the maximum measurement time used when determining whether the maximum measurement time has elapsed in step S15 shown in FIG. 8 as a value for each communication quality measurement content.
  • the communication device 1 can transmit measurement information at different times for each communication quality measurement.
  • the communication device 1 can transmit measurement information at appropriate times for each communication quality measurement.
  • both the minimum and maximum measurement times used by the measurement condition determination unit 13 in the determination process may be set to different values for each communication quality measurement, or only the minimum measurement time may be set to a different value for each communication quality measurement.
  • communication devices 1 and 2 are capable of setting at least the minimum measurement time, which is used when determining whether the minimum measurement time has elapsed in step S12 shown in FIG. 8, and the maximum measurement time, which is used when determining whether the maximum measurement time has elapsed in step S15 shown in FIG. 8, for each communication quality measurement. Because communication devices 1 and 2 according to this embodiment are able to transmit measurement information at appropriate timing for each communication quality measurement, they can achieve more accurate communication quality measurement compared to embodiment 1.
  • Embodiment 3 Next, a communication device according to a third embodiment will be described.
  • the configuration of the communication device according to the third embodiment is the same as that of the first embodiment (see FIG. 3), but part of the operation of the measurement condition determination unit differs from that of the first embodiment. Therefore, in this embodiment, the description of the parts common to the first embodiment will be omitted, and the operation of the measurement condition determination units 13 and 23 that perform operations different from those of the first embodiment will be described.
  • the on-board communication device 1 generates measurement information and transmits it to the on-board communication device 2.
  • the measurement condition determination unit 13 of the communication device 1 according to the third embodiment is capable of setting a different value for each communication line as the minimum measurement time used when determining whether the minimum measurement time has elapsed in step S12 shown in FIG. 8.
  • the measurement condition determination unit 13 according to the third embodiment performs the process of determining whether the minimum measurement time has elapsed by using, from among a plurality of minimum measurement times prepared in advance, the minimum measurement time corresponding to the communication line whose communication quality is to be measured.
  • Figure 16 shows examples of multiple minimum measurement times that have been prepared in advance.
  • Figure 16 is a diagram showing an example of the minimum measurement times that the measurement condition determination unit 13 according to the third embodiment uses in the determination process.
  • Figure 16 shows an example in which there are two communication lines between communication device 1 and communication device 2.
  • the minimum measurement time used by the measurement condition determination unit 13 when measuring the communication quality of communication line #1 is T1
  • the minimum measurement time used when measuring the communication quality of communication line #2 is T2. Note that T1 and T2 may be set to the same value.
  • the measurement condition determination unit 13 may further set the maximum measurement time used when determining whether the maximum measurement time has elapsed in step S15 shown in FIG. 8 as a value for each communication line.
  • the communication device 1 can transmit measurement information at different times for each communication line.
  • the communication device 1 can measure communication quality by transmitting measurement information at the appropriate time for each communication line. This makes it possible to change the frequency of communication quality measurements for each communication line, enabling, for example, more frequent measurements for communication lines with unstable communication quality and less frequent measurements for communication lines with stable communication quality.
  • communication line #1 shown in Figure 16 is a local 5G line and communication line #2 is a public 5G line
  • the minimum measurement time and maximum measurement time are both set to small values, so that measurement information is sent more frequently.
  • the public 5G line which does incur communication charges
  • the minimum measurement time and maximum measurement time are both set to large values, so that measurement information is sent less frequently, thereby minimizing increases in communication charges.
  • both the minimum and maximum measurement times used by the measurement condition determination unit 13 in the determination process may be set to different values for each communication line, or only the minimum measurement time may be set to a different value for each communication line.
  • communication devices 1 and 2 are capable of setting at least the minimum measurement time, out of the minimum measurement time used when determining whether the minimum measurement time has elapsed in step S12 shown in FIG. 8 and the maximum measurement time used when determining whether the maximum measurement time has elapsed in step S15 shown in FIG. 8, for each communication line. Because communication devices 1 and 2 according to this embodiment are able to transmit measurement information at different frequencies for each communication line, they can achieve more accurate communication quality measurement compared to embodiment 1. Furthermore, they are able to transmit measurement information at a frequency that takes into account the communication charges incurred for each communication line when measuring communication quality.
  • Embodiment 4 Next, a communication device according to a fourth embodiment will be described.
  • the configuration of the communication device according to the fourth embodiment is the same as that of the first embodiment (see FIG. 3), but part of the operation of the measurement condition determination unit differs from that of the first embodiment. Therefore, in this embodiment, the description of the parts common to the first embodiment will be omitted, and only the operation of the measurement condition determination units 13 and 23 that operate differently from that of the first embodiment will be described.
  • the on-board communication device 1 generates measurement information and transmits it to the on-board communication device 2.
  • the measurement condition determination unit 13 of the communication device 1 according to the fourth embodiment is capable of setting a different value for each application type as the minimum measurement time used when determining whether the minimum measurement time has elapsed in step S12 shown in FIG. 8. That is, the measurement condition determination unit 13 according to the fourth embodiment performs the process of determining whether the minimum measurement time has elapsed by using, from among a plurality of minimum measurement times prepared in advance, the minimum measurement time corresponding to the application that creates the user data to be transferred.
  • Figure 17 shows examples of multiple minimum measurement times that have been prepared in advance.
  • Figure 17 is a diagram showing an example of the minimum measurement times that the measurement condition determination unit 13 according to the fourth embodiment uses in the determination process.
  • Figure 17 shows an example in which there are two types of applications that create user data to be transferred between communication device 1 and communication device 2.
  • the minimum measurement time used by the measurement condition determination unit 13 when measuring the communication quality of the communication line transferring user data for application #1 is T1
  • the minimum measurement time used when measuring the communication quality of the communication line transferring user data for application #2 is T2.
  • T1 and T2 may be set to the same value.
  • the measurement condition determination unit 13 may further set the maximum measurement time used when determining whether the maximum measurement time has elapsed in step S15 shown in FIG. 8 as a value for each application type.
  • the communication device 1 can transmit measurement information at different times for each application type.
  • the communication device 1 can measure communication quality by transmitting measurement information at an appropriate time for each application type. This makes it possible to change the frequency of communication quality measurements for each application type; for example, communication quality can be measured more frequently for communication lines transferring applications that require real-time performance, and communication quality can be measured less frequently for communication lines transferring applications that do not require real-time performance.
  • both the minimum and maximum measurement times used by the measurement condition determination unit 13 in the determination process may be set to different values for each application type, or only the minimum measurement time may be set to a different value for each application type.
  • communication devices 1 and 2 are capable of setting at least the minimum measurement time, which is used when determining whether the minimum measurement time has elapsed in step S12 shown in FIG. 8, and the maximum measurement time, which is used when determining whether the maximum measurement time has elapsed in step S15 shown in FIG. 8, for each application type. Because communication devices 1 and 2 according to this embodiment are able to transmit measurement information at different frequencies for each application type, they can achieve more accurate communication quality measurement compared to embodiment 1.
  • Embodiment 5 Next, a communication device according to a fifth embodiment will be described.
  • the configuration of the communication device according to the fifth embodiment is the same as that of the first embodiment (see FIG. 3), but part of the operation of the measurement condition determination unit differs from that of the first embodiment. Therefore, in this embodiment, the description of the parts common to the first embodiment will be omitted, and only the operation of the measurement condition determination units 13 and 23 that operate differently from that of the first embodiment will be described.
  • the on-board communication device 1 generates measurement information and transmits it to the on-board communication device 2.
  • the measurement condition determination unit 13 of the communication device 1 according to the fifth embodiment can set the minimum measurement time used when determining whether the minimum measurement time has elapsed in step S12 shown in FIG. 8 to a different value for each transmission protocol used. In other words, the measurement condition determination unit 13 according to the fifth embodiment performs the process of determining whether the minimum measurement time has elapsed using the minimum measurement time corresponding to the transmission protocol used for transferring user data, from among multiple minimum measurement times prepared in advance.
  • Figure 18 shows examples of multiple minimum measurement times that have been prepared in advance.
  • Figure 18 is a diagram showing an example of minimum measurement times that the measurement condition determination unit 13 according to the fifth embodiment uses in the determination process.
  • Figure 18 shows an example in which three types of transmission protocols are used in the transfer of user data between communication device 1 and communication device 2.
  • the minimum measurement time used by the measurement condition determination unit 13 when the transmission protocol is TCP (Transmission Control Protocol) is T1
  • the minimum measurement time used by the measurement condition determination unit 13 when the transmission protocol is UDP (User Datagram Protocol) is T2
  • the minimum measurement time used by the measurement condition determination unit 13 when the transmission protocol is ICMP is T3.
  • TCP Transmission Control Protocol
  • UDP User Datagram Protocol
  • ICMP Internet Control Message Protocol
  • the measurement condition determination unit 13 may further set the maximum measurement time used when determining whether the maximum measurement time has elapsed in step S15 shown in FIG. 8 to a value that is specific to the transmission protocol being used.
  • the communication device 1 can transmit measurement information at different times for each transmission protocol used.
  • the communication device 1 can measure communication quality by transmitting measurement information at the appropriate time for each transmission protocol. This makes it possible to change the frequency of communication quality measurements for each transmission protocol. For example, communication quality can be measured more frequently for a transmission protocol used to transfer user data that requires real-time performance, and communication quality can be measured less frequently for a transmission protocol used to transfer user data that does not require real-time performance.
  • ICMP is often used for status monitoring and has a high affinity with communication quality measurement, so the minimum and maximum measurement times are both set to small values to increase the frequency of measurement information transmission.
  • UDP does not have a session state and has the second highest affinity with communication quality measurement after ICMP, so the minimum and maximum measurement times are set to values between those of ICMP and TCP.
  • TCP does have a session state and has a lower affinity with communication quality measurement than ICMP and UDP, so the minimum and maximum measurement times are set to larger values than ICMP and UDP.
  • both the minimum and maximum measurement times used by the measurement condition determination unit 13 in the determination process may be set to different values for each transmission protocol, or only the minimum measurement time may be set to a different value for each transmission protocol.
  • communication devices 1 and 2 according to this embodiment are able to set at least the minimum measurement time, which is used when determining whether the minimum measurement time has elapsed in step S12 shown in FIG. 8, and the maximum measurement time, which is used when determining whether the maximum measurement time has elapsed in step S15 shown in FIG. 8, for each transmission protocol. Because communication devices 1 and 2 according to this embodiment are able to transmit measurement information at different frequencies for each transmission protocol, they can achieve more accurate communication quality measurement compared to embodiment 1.
  • Embodiment 6 Next, a communication device according to a sixth embodiment will be described.
  • the configuration of the communication device according to the sixth embodiment is the same as that of the first embodiment (see FIG. 3), but part of the operation of the measurement condition determination unit differs from that of the first embodiment. Therefore, in this embodiment, the description of the parts common to the first embodiment will be omitted, and only the operation of the measurement condition determination units 13 and 23 that operate differently from that of the first embodiment will be described.
  • the on-board communication device 1 generates measurement information and transmits it to the on-board communication device 2.
  • the measurement condition determination unit 13 of the communication device 1 according to the sixth embodiment is capable of changing the minimum measurement time used when determining whether the minimum measurement time has elapsed in step S12 shown in FIG. 8, depending on the measurement results of communication quality.
  • the measurement condition determination unit 13 according to the sixth embodiment performs the process of determining whether the minimum measurement time has elapsed using the minimum measurement time corresponding to the past communication quality measurement results, out of multiple minimum measurement times prepared in advance.
  • Figure 19 shows examples of multiple minimum measurement times that have been prepared in advance.
  • Figure 19 shows an example of minimum measurement times that the measurement condition determination unit 13 according to the sixth embodiment uses in the determination process.
  • the minimum measurement time used by the measurement condition determination unit 13 when the amount of change A in communication quality calculated from past communication quality measurement results is less than threshold #1 is set to T1
  • the minimum measurement time used by the measurement condition determination unit 13 when the amount of change A is equal to or greater than threshold #1 but less than threshold #2 is set to T2.
  • the measurement condition determination unit 13 may further be able to change the maximum measurement time used when determining whether the maximum measurement time has elapsed in step S15 shown in FIG. 8, depending on the measurement results of communication quality.
  • the communication device 1 can change the timing of transmitting measurement information depending on the measurement results of communication quality.
  • the communication device 1 can measure communication quality by transmitting measurement information at a timing that corresponds to the amount of change in communication quality. Therefore, for example, it becomes possible to perform communication quality measurements more frequently when the amount of change in communication quality is large, and to reduce the frequency of communication quality measurements when the amount of change in communication quality is small.
  • the difference between the latest communication quality measurement result and the most recent communication quality measurement result is small, it is assumed that communication is stable, so the minimum and maximum measurement times are both set to large values, and the measurement information is sent less frequently. Also, if the difference between the latest communication quality measurement result and the most recent communication quality measurement result is large, it is assumed that communication is unstable, so the minimum and maximum measurement times are both set to small values, and the measurement information is sent more frequently.
  • both the minimum and maximum measurement times used by the measurement condition determination unit 13 in the determination process may be changed depending on the results of the communication quality measurement, or only the minimum measurement time may be changed depending on the results of the communication quality measurement.
  • communication devices 1 and 2 according to this embodiment are able to change at least the minimum measurement time, out of the minimum measurement time used when determining whether the minimum measurement time has elapsed in step S12 shown in FIG. 8 and the maximum measurement time used when determining whether the maximum measurement time has elapsed in step S15 shown in FIG. 8, in accordance with the measurement results of communication quality. Because communication devices 1 and 2 according to this embodiment are able to transmit measurement information at a frequency according to communication quality, they can achieve more accurate communication quality measurement compared to embodiment 1.
  • communication devices 1 and 2 are applied to a railway system, but application is not limited to railway systems.
  • 5G has been used as an example, but application is not limited to 5G, and the devices may also be applied to similar mobile communication systems such as LTE (Long Term Evolution) and Wi-Fi (registered trademark).

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Abstract

Dispositif de communication (1, 2) comprenant : une unité de transfert de données (11, 21) qui est connectée à une ligne de communication et transfère des données d'utilisateur d'une application à la ligne de communication; une unité de mesure de qualité de communication (12, 22) qui mesure la qualité de communication de la ligne de communication; et une unité de détermination de condition de mesure (13, 23) qui détermine un procédé de transmission de données de mesure, qui est transmis lorsque l'unité de mesure de qualité de communication (12, 22) mesure la qualité de communication, sur la base de la taille des données de mesure, de l'état d'occurrence des données d'utilisateur, et de la taille de transfert maximale de la ligne de communication.
PCT/JP2024/007898 2024-03-01 2024-03-01 Dispositif de communication, procédé de mesure de qualité de communication, circuit de commande et support de stockage Pending WO2025182095A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001086055A (ja) * 1999-09-09 2001-03-30 Hitachi Kokusai Electric Inc 移動体無線システム
WO2004064341A1 (fr) * 2003-01-14 2004-07-29 Fujitsu Limited Procede d'execution d'un transfert sans interruption pendant une panne de ligne dans un reseau ip
JP2008153825A (ja) * 2006-12-15 2008-07-03 Matsushita Electric Ind Co Ltd 伝搬環境推定方法および伝播環境推定装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001086055A (ja) * 1999-09-09 2001-03-30 Hitachi Kokusai Electric Inc 移動体無線システム
WO2004064341A1 (fr) * 2003-01-14 2004-07-29 Fujitsu Limited Procede d'execution d'un transfert sans interruption pendant une panne de ligne dans un reseau ip
JP2008153825A (ja) * 2006-12-15 2008-07-03 Matsushita Electric Ind Co Ltd 伝搬環境推定方法および伝播環境推定装置

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