WO2020174637A1 - Dispositif, système, procédé et programme de communication - Google Patents

Dispositif, système, procédé et programme de communication Download PDF

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Publication number
WO2020174637A1
WO2020174637A1 PCT/JP2019/007729 JP2019007729W WO2020174637A1 WO 2020174637 A1 WO2020174637 A1 WO 2020174637A1 JP 2019007729 W JP2019007729 W JP 2019007729W WO 2020174637 A1 WO2020174637 A1 WO 2020174637A1
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WIPO (PCT)
Prior art keywords
data
communication
mode
unit
setting
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PCT/JP2019/007729
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English (en)
Japanese (ja)
Inventor
照子 藤井
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三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2019/007729 priority Critical patent/WO2020174637A1/fr
Priority to JP2021501477A priority patent/JP6873346B2/ja
Publication of WO2020174637A1 publication Critical patent/WO2020174637A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/40—Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code
    • H03M7/42—Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code using table look-up for the coding or decoding process, e.g. using read-only memory

Definitions

  • the present invention relates to a technique for updating setting parameters used when compressing communication data.
  • data from a large number of devices such as automobiles and various sensors are being sequentially collected and used by servers on a wireless network.
  • data of driving operation with good fuel efficiency is collected and fed back to the driving support system.
  • data from position sensors is collected to predict or detect the occurrence of a disaster such as a landslide.
  • a device on the transmission side compresses data (hereinafter, referred to as communication data) based on a predetermined procedure and then transmits the data. Then, the receiving server receives the compressed data, expands the compressed data based on a predetermined procedure, and obtains communication data.
  • the following method is an example of the procedure of data compression and decompression.
  • a pair of a data pattern, which is a data fragment in communication data, and a pattern code, which is a code having a smaller data size than the data fragment that uniquely indicates the data fragment, are registered by the communication device on the transmission side and the server on the reception side. Share the dictionary.
  • the communication device converts a data pattern included in the communication data into a pattern code according to a dictionary to compress the data amount of the communication data and then transmits the compressed data to the server.
  • the server Upon receiving the data, the server converts the pattern code included in the communication data into a data pattern according to the dictionary and expands the communication data to the original state.
  • the data volume reduction effect of the communication data varies depending on whether or not the setting parameter used when executing the procedure is suitable for the communication data.
  • the setting parameter is a set of a data pattern and a pattern code registered in the dictionary.
  • the upper limit is often set in advance for the number of pairs of data patterns and pattern codes that can be registered in the dictionary. Therefore, the higher the frequency of appearance of the data pattern registered in the dictionary in the communication data, the higher the effect of reducing the data amount of the communication data.
  • the communication data does not include at least one data pattern registered in the dictionary, the communication data amount does not decrease at all.
  • a communication device transmits statistical information on the appearance frequency of data patterns appearing in communication data transmitted to a server to a server, and the server includes a dictionary so that a data pattern having a high appearance frequency is included based on the statistical information. It has been described to correct.
  • Patent Document 1 the data transmitted from the communication device to the server is constantly inspected to correct the dictionary. Therefore, the communication device constantly uses resources such as a processor and a memory not only for compression processing for transmitting communication data but also for processing for correcting setting parameters.
  • An object of the present invention is to make it possible to adjust the setting parameter while suppressing the steady use of resources.
  • a communication device A data acquisition unit that acquires communication data, A data processing unit that processes the communication data acquired by the data acquisition unit to generate processed data in which the communication data is compressed, based on a setting parameter shared with a communication partner device.
  • a mode management unit for switching between a plurality of operation modes, Adjusting the setting parameter based on the communication data acquired by the data acquisition unit when operating in a part of the plurality of operation modes switched by the mode management unit, and other operation modes
  • a setting adjustment unit that does not adjust the setting parameter based on the communication data acquired by the data acquisition unit.
  • the setting parameter is adjusted based on the communication data acquired when operating in some operation modes, and the setting parameter is adjusted based on the communication data acquired when operating in another operation mode. Is not adjusted. Therefore, the resources are not constantly used for the adjustment processing of the setting parameters, and it is possible to suppress the steady resource usage.
  • FIG. 1 is a configuration diagram of a communication system 100 according to the first embodiment.
  • 3 is a hardware configuration diagram of the communication device 10 according to the first embodiment.
  • FIG. 3 is a hardware configuration diagram of the server 20 according to the first embodiment.
  • FIG. 3 is a functional configuration diagram of the communication device 10 according to the first embodiment.
  • FIG. 3 is a functional configuration diagram of the server 20 according to the first embodiment.
  • 3 is a flowchart showing the operation of the data acquisition unit 111 according to the first embodiment.
  • 3 is a flowchart showing the operation of the mode management unit 112 according to the first embodiment.
  • FIG. 4 is an explanatory diagram of switching operation modes according to the first embodiment.
  • FIG. 6 is a flowchart showing the operation of the data processing unit 113 according to the first embodiment.
  • FIG. 3 is a diagram showing a data format of a pattern code according to the first embodiment.
  • FIG. 6 is a diagram showing a data format of a portion that cannot be converted into the pattern code according to the first embodiment.
  • FIG. 3 is a diagram showing a configuration example of processed data according to the first embodiment.
  • FIG. 4 is a diagram showing a configuration example of a data message according to the first embodiment.
  • 3 is a flowchart showing the operation of the setting adjustment unit 114 according to the first embodiment.
  • the figure which shows the pattern table 52 which concerns on Embodiment 1. 6 is a flowchart showing the operation of the setting change unit 115 according to the first embodiment.
  • FIG. 3 is a diagram showing a data format of a pattern code according to the first embodiment.
  • FIG. 6 is a diagram showing a data format of a portion that cannot be converted into the pattern code according to the first embodiment.
  • FIG. 6 is a diagram showing a configuration example of a parameter change message according to the first embodiment.
  • FIG. 6 is a diagram showing a configuration example of a parameter change response according to the first embodiment.
  • 6 is a flowchart showing the operation of the data restoration unit 212 according to the first embodiment.
  • 6 is a flowchart showing the operation of the setting adjustment unit 213 according to the first embodiment.
  • 3 is a hardware configuration diagram of the communication device 10 according to the second embodiment.
  • FIG. 3 is a functional configuration diagram of the communication device 10 according to the second embodiment.
  • FIG. 6 is a flowchart showing the operation of the data acquisition unit 111 according to the second embodiment.
  • FIG. 9 is a flowchart showing the operation of the data processing unit 113 according to the second embodiment.
  • 9 is a flowchart showing the operation of the setting adjustment unit 114 according to the second embodiment.
  • 9 is a flowchart showing the operation of the mode management unit 112 according to the second embodiment.
  • 9 is a flowchart showing the operation of the mode management unit 112 according to the second embodiment.
  • FIG. 6 is an explanatory diagram of switching operation modes according to the second embodiment.
  • FIG. 6 is a diagram showing a specific operation example for adjusting the setting parameter 51 according to the second embodiment.
  • 4 is a functional configuration diagram of a communication device 10 according to a third embodiment.
  • FIG. 9 is a flowchart showing the operation of the mode management unit 112 according to the third embodiment.
  • 9 is a flowchart showing the operation of the setting adjustment unit 114 according to the third embodiment.
  • the communication system 100 includes a plurality of communication devices 10 and a server 20.
  • the communication system 100 is a system that sequentially collects communication data of a plurality of communication devices 10 in the server 20 via the wireless network 30 and the network 40.
  • the wireless network 30 is a wireless communication path for connecting the communication device 10 and the network 40.
  • the network 40 is a communication path for communicating between devices located in a wide area, and is, for example, the Internet or a wide area network dedicated to a company or the like. Note that the communication devices 10 and the server 20 are not limited to the wireless network 30 and the network 40, and may be connected via any communication path.
  • the communication device 10 includes a processor 11, a ROM 12 (Read Only Memory), a RAM 13 (Random Access Memory), a wireless modem 14, an antenna 15, one or more sensors 16, a timer 17, and a nonvolatile memory 18. And a communication bus 19.
  • the processor 11 is a device that loads a program stored in the ROM 12 into the RAM 13 and executes the program.
  • the processor 11 is, as a specific example, a CPU (Central Processing Unit).
  • the ROM 12 is a non-volatile storage medium in which programs and the like executed by the processor 11 are stored.
  • the RAM 13 is a work storage medium for loading the program from the ROM 12 and causing the processor 11 to operate.
  • the communication device 10 replaces the ROM 12 with an SD (registered trademark, Secure Digital) memory card, CF (CompactFlash, registered trademark), NAND flash, flexible disk, optical disc, compact disc, Blu-ray (registered trademark) disc, DVD (Digital).
  • a portable recording medium such as Versatile Disk may be provided.
  • the wireless modem 14 is a device for communicating with the wireless network 30.
  • the wireless modem 14 is a modem for performing communication such as LTE (Long Term Evolution), LPWA (Low Power Wide Area), and DSRC (Dedicated Short Range Communications).
  • the antenna 15 is an antenna for wirelessly communicating with the wireless network 30.
  • the sensor 16 is a device that constantly collects communication data in the vicinity of the communication device 10 and passes the communication data to a program running on the processor 11 via the communication bus 19.
  • the sensor 16 is configured to be mounted on the communication device 10.
  • the sensor 16 may be provided outside the communication device 10 and connected by a communication path such as Ethernet (registered trademark), RS232C, and CAN (Controller Area Network).
  • the sensor 16 is a temperature sensor, a humidity sensor, an acceleration sensor, a camera, or the like. Therefore, the communication data includes temperature, humidity, acceleration, image data, and the like.
  • the communication data is not limited to this, and may be vehicle device information such as a steering wheel angle of the vehicle and position information of the vehicle.
  • the timer 17 is a device that notifies the processor 11 of a timeout notification when the time set by the processor 11 has elapsed.
  • the non-volatile memory 18 is a non-volatile storage medium in which data can be written.
  • the communication bus 19 is an internal communication path for the processor 11, the ROM 12, the RAM 13, the wireless modem 14, the sensor 16, the timer 17, and the non-volatile memory 18 to exchange data.
  • the server 20 includes a processor 21, an HDD 22 (Hard Disk Drive), a RAM 23, a communication modem 24, and a communication bus 25.
  • the processor 21 is a device that loads a program stored in the HDD 22 into the RAM 23 and executes the program.
  • the processor 21 is, as a specific example, a CPU.
  • the HDD 22 is a non-volatile storage medium that stores programs and the like executed by the processor 21.
  • the RAM 23 is a working storage medium for loading the program from the HDD 22 and causing the processor 21 to operate.
  • the server 20 replaces the HDD 22 with an SD (registered trademark, Secure Digital) memory card, a CF (CompactFlash, registered trademark), a NAND flash, a flexible disk, an optical disc, a compact disc, a Blu-ray (registered trademark) disc, a DVD (Digital Versatile).
  • a portable recording medium such as Disk may be provided.
  • the communication modem 24 is a device for communicating with the network 40.
  • the communication modem 24 is, for example, a modem for performing communication such as Ethernet (registered trademark) and TCP/IP (Transmission Control Protocol/Internet Protocol).
  • the communication bus 25 is an internal communication path for the processor 21, the HDD 22, the RAM 23, and the communication modem 24 to exchange data.
  • the functional configuration of the communication device 10 according to the first embodiment will be described with reference to FIG.
  • the communication device 10 includes a data acquisition unit 111, a mode management unit 112, a data processing unit 113, a setting adjustment unit 114, a setting change unit 115, and a transmission unit 116 as functional components.
  • the function of each functional component of the communication device 10 is realized by software.
  • the ROM 12 stores programs that realize the functions of the functional components of the communication device 10. This program is read into the RAM 13 by the processor 11 and executed by the processor 11. As a result, the function of each functional component of the communication device 10 is realized.
  • the non-volatile memory 18 also stores a setting parameter 51, a pattern table 52, and an adjustment parameter 53.
  • the server 20 includes a communication unit 211, a data restoration unit 212, and a setting adjustment unit 213 as functional components.
  • the function of each functional component of the server 20 is realized by software.
  • the HDD 22 stores programs that implement the functions of the functional components of the server 20. This program is read into the RAM 23 by the processor 21 and executed by the processor 21. As a result, the function of each functional component of the server 20 is realized.
  • the HDD 22 also stores a terminal table 61, a setting parameter table 62, and a sensor data table 63.
  • the operation of the communication system 100 according to the first embodiment will be described with reference to FIGS. 6 to 23.
  • the operation of the communication system 100 according to the first embodiment corresponds to the communication method according to the first embodiment.
  • the operation of the communication system 100 according to the first embodiment corresponds to the processing of the communication program according to the first embodiment.
  • the setting parameter 51 a data pattern that is a data fragment in communication data and a pattern code that is a code having a smaller data size than the data fragment that uniquely identifies the data fragment.
  • the dictionary in which the set is registered is used.
  • the communication device 10 converts a data pattern included in the communication data into a pattern code according to a dictionary, compresses the data amount of the communication data, and then transmits the compressed data.
  • the server 20 converts the pattern code included in the communication data into a data pattern according to the dictionary and expands the communication data to the original state.
  • the setting parameter 51 is not limited to the above-mentioned dictionary and may be a parameter in another compression method.
  • step S1001 the data acquisition unit 111 determines whether communication data has been acquired from any of the sensors 16. When the communication data is acquired, the data acquisition unit 111 advances the process to step S1002. On the other hand, when the communication data has not been acquired, the data acquisition unit 111 determines whether the communication data has been acquired again after the elapse of a certain time. In step S1002, the data acquisition unit 111 transmits the acquired communication data to the data processing unit 113.
  • data such as communication data is transmitted between the functional components, inter-process communication or data transfer via the RAM 13 is used.
  • the mode management unit 112 determines the adjustment waiting time TM 0 .
  • Mode management section 112 with respect to the minimum adjustment latency TM MIN and the maximum adjustment latency TM MAX previously determined, determining the random value satisfying TM MIN ⁇ TM 0 ⁇ TM MAX as an adjustment latency TM 0.
  • the mode management unit 112 sets the adjustment waiting time TM 0 as the timeout time and activates the timer 17.
  • step S1103 the mode management unit 112 sets the operation mode of the communication device 10 to the normal mode.
  • step S1104 the mode management unit 112 waits until the timer 17 times out, and when the timer 17 times out, the process proceeds to step S1105.
  • step S1105 the mode management unit 112 determines which one of the normal mode, the detection mode, and the adjustment mode the communication device 10 is set to.
  • the mode management unit 112 advances the process to step S1106.
  • the mode management unit 112 advances the process to step S1108. If the adjustment mode is set, the mode management unit 112 advances the process to step S1110.
  • step S1106 the mode management unit 112 switches the operation mode of the communication device 10 to the detection mode and sets it.
  • step S1107 the mode management unit 112 determines the detection time TC i .
  • Mode management section 112 to a predetermined minimum detection time TC MIN and a maximum detection time TC MAX, to determine the random value satisfying TC MIN ⁇ TC i ⁇ TC MAX as the detection time TC i.
  • the mode management unit 112 sets the detection time TC i to the timeout time and starts the timer 17.
  • step S1108 the mode management unit 112 switches the operation mode of the communication device 10 to the adjustment mode and sets it.
  • step S1109 the mode management unit 112 determines the adjustment time TS i .
  • Mode management section 112 with respect to the minimum adjustment time TS MIN and the maximum adjustment time predetermined TS MAX, to determine the random value satisfying TS MIN ⁇ TS i ⁇ TS MAX as an adjustment time TS i.
  • the mode management unit 112 sets the adjustment time TS i to the timeout time and starts the timer 17.
  • step S1110 the mode management unit 112 switches the operation mode of the communication device 10 to the normal mode and sets it.
  • step S1111 the mode management unit 112 determines the adjustment waiting time TM i .
  • the mode management unit 112 sets a random value satisfying TM MIN ⁇ TM i ⁇ TM MAX for the predetermined minimum adjustment waiting time TM MIN and maximum adjustment waiting time TM MAX. It is determined as the adjustment waiting time TM i .
  • step 1112 the mode management unit 112 sets the adjustment waiting time TM i to the timeout time and starts the timer 17.
  • the mode management unit 112 uses the timer 17 to adjust the operation mode of the communication device 10 from the normal mode to the detection mode, from the detection mode to the adjustment mode, at random time intervals. Switch from mode to normal mode in order. Therefore, as shown in FIG. 9, when the communication device 10 is activated at time t0, the normal mode is first executed for the adjustment waiting time TM 0 . Next, the detection mode is executed for the detection time TC 0 from the time t1 when the adjustment waiting time TM 0 has elapsed, and then the adjustment mode is executed for the adjustment time TS 0 from the time t2.
  • the normal mode is executed for the adjustment waiting time TM 1 from time t3
  • the detection mode is executed for the detection time TC 1 from time t4
  • the adjustment mode is executed for the adjustment time TS 1 from time t5. ..
  • the normal mode, the detection mode, and the adjustment mode are repeated at random time intervals.
  • the data processing unit 113 processes the communication data transmitted in step S1002 based on the setting parameter 51 shared with the server 20 that is the communication partner device, and processes the communication data to be compressed. Generate data. Specifically, the data processing unit 113 searches the communication data for the data pattern registered in the setting parameter 51, and replaces the matching portion with the pattern code corresponding to the data pattern. For example, as shown in FIG. 11, the data format of the pattern code is a total of 8 bits of “1 (1 bit)+pattern code (7 bit)”.
  • the data processing unit 113 replaces the portion with “1 (1 bit)+pattern code (7 bit)”.
  • the remaining part that could not be converted into the pattern code is replaced with a data format of "0 (1 bit)+communication data bit length (7 bits)+communication data” as shown in FIG.
  • the data processing unit 113 generates processed data in the data format as shown in FIG.
  • step S1202 the data processing unit 113 transmits the communication data that has not been processed in step S1201 to the setting adjustment unit 114. That is, the data processing unit 113 transmits the communication data transmitted in step S1002 to the setting adjustment unit 114.
  • step S1203 the data processing unit 113 transmits the processed data, which is the communication data processed in step S1201, to the transmission unit 116. Then, as shown in FIG. 14, the transmitting unit 116 adds a 8-bit identifier indicating the type to the beginning of the processed data to generate a data message, controls the wireless modem 14, and transmits the data message to the server 20. ..
  • step S1301 the setting adjustment unit 114 determines which one of the normal mode, the detection mode, and the adjustment mode the communication device 10 is set to. If the normal mode is set, the setting adjustment unit 114 advances the process to step S1306. If the detection mode is set, the setting adjustment unit 114 advances the process to step S1302. If the adjustment mode is set, the setting adjustment unit 114 advances the process to step S1305.
  • step S1301 executed from time t0 to time t1 in FIG. 9. Therefore, in step S1301 executed from time t0 to time t1 in FIG. 9, it is determined that the normal mode is set, and the process proceeds to step S1306.
  • step S1306 the setting adjustment unit 114 determines whether data is registered in the pattern table 52. If the data is registered in the pattern table 52, the setting adjustment unit 114 advances the process to step S1307. On the other hand, the setting adjustment unit 114 ends the process when the data is not registered in the pattern table 52. Since the data is not registered in the pattern table 52 immediately after the communication device 10 is activated, the setting adjustment unit 114 ends the process.
  • step S1301 executed from time t1 to time t2 in FIG. 9, it is determined that the detection mode is set, and the process proceeds to step S1302.
  • step S132 the setting adjustment unit 114 determines whether or not data is registered in the pattern table 52. If the data is not registered, the setting adjustment unit 114 advances the process to step S1303. On the other hand, if the data is registered, the setting adjustment unit 114 advances the process to step S1304. In step S1302, which is executed for the first time after entering the period of the detection mode, no data is registered in the pattern table 52, so the process proceeds to step 1303.
  • step S1303 the setting adjustment unit 114 copies the data pattern registered in the setting parameter 51 to the pattern table 52.
  • step S1302 executed for the second time after entering the period of the detection mode, since the data is registered in the pattern table 52, step S1303 is skipped.
  • step S1304 the setting adjustment unit 114 extracts a data pattern from the communication data transmitted in step S1202 and registers it in the pattern table 52.
  • the setting adjustment unit 114 may extract the data pattern from each of the communication data of one time transmitted by the data processing unit 113 during one detection mode, that is, during the period from time t1 to time t2. However, the data pattern may be extracted from the entire communication data transmitted by the data processing unit 113 during one detection mode.
  • step S1301 executed from time t2 to time t3 in FIG. 9
  • step S1301 executed from time t2 to time t3 in FIG. 9
  • step S1301 executed from time t2 to time t3 in FIG. 9
  • step S1301 executed from time t2 to time t3 in FIG. 9
  • step S1301 executed from time t2 to time t3 in FIG. 9
  • step S1301 executed from time t2 to time t3 in FIG. 9
  • step S1301 executed from time t2 to time t3 in FIG. 9
  • step S1301 executed from time t2 to time t3 in FIG. 9
  • step S1301 executed from time t2 to time t3 in FIG. 9
  • step S1301 executed from time t2 to time t3 in FIG. 9
  • step S1301 executed from time t2 to time t3 in FIG. 9
  • step S1301 executed from time t2 to time t3 in FIG. 9
  • the setting adjustment unit 114 may search for a data pattern from each of the one-time communication data transmitted by the data processing unit 113 during one adjustment mode, that is, during the period from time t2 to time t3.
  • the data pattern may be searched from the entire communication data transmitted by the data processing unit 113 during one adjustment mode.
  • step S1301 executed from time t3 to time t4 in FIG. 9, it is determined that the normal mode is set, and the process proceeds to step S1306.
  • step S1307 the setting adjustment unit 114 advances the process to step S1307.
  • step S1307 the setting adjustment unit 114 generates the adjustment parameter 53 based on the pattern table 52. Specifically, the setting adjustment unit 114 sequentially extracts the data patterns registered in the pattern table 52 in descending order of the number of appearances until the number of registered data patterns of the setting parameter 51 reaches the upper limit.
  • the setting adjustment unit 114 registers the set of the extracted data pattern and the data code corresponding to the data pattern in the adjustment parameter 53.
  • the data code corresponding to the data pattern is set based on a predetermined rule.
  • the setting adjustment unit 114 deletes all the data registered in the pattern table 52.
  • the setting adjustment unit 114 calls the setting change unit 115.
  • the setting adjustment unit 114 updates the setting parameter 51 from the communication data acquired when operating in the detection mode according to the operation mode switching between the normal mode, the detection mode, and the adjustment mode by the mode management unit 112. Is registered and registered in the pattern table 52. Then, the setting adjustment unit 114 counts the number of appearances of the update data registered in the pattern table 52 when operating in the adjustment mode, and when the adjustment mode ends, the setting parameter 51 is referred to by referring to the number of appearances. Adjust.
  • step S1401 the setting change unit 115 deletes all the data of the setting parameter 51.
  • step S1402 the setting changing unit 115 transmits the adjustment parameter 53 to the transmitting unit 116. Then, as shown in FIG.
  • the transmitting unit 116 adds a 8-bit identifier indicating the type to the head of the adjustment parameter 53 to generate a parameter change message, and controls the wireless modem 14 to send the parameter change message to the server 20.
  • the setting change unit 115 waits until a parameter change response is transmitted from the server 20.
  • the setting change unit 115 advances the process to step S1404.
  • the parameter change response is 8-bit data indicating the type.
  • the transmission of the parameter change response means that the server 20 has finished the adjustment with the adjustment parameter.
  • the setting changing unit 115 copies the adjustment parameter 53 to the setting parameter 51. This completes the change of the setting parameter 51. After that, the communication device 10 and the server 20 perform processing using the new setting parameter 51.
  • the communication unit 211 receives the data message. Then, the communication unit 211 transmits the portion excluding the 8-bit identifier from the data message, that is, the processed data, to the data restoration unit 212 together with the IP (Internet Protocol) address of the transmission source of the data message.
  • IP Internet Protocol
  • the data restoration unit 212 acquires the setting parameter ID of the communication device 10 from the terminal table 61.
  • the terminal table 61 stores a terminal ID, a terminal type, an IP address, and a setting parameter ID for each communication device 10.
  • the terminal ID is an identifier of the communication device 10.
  • the terminal type indicates the role or the like of the communication device 10.
  • the IP address is the IP address of the communication device 10.
  • the setting parameter ID is an identifier of the setting parameter of the communication device 10.
  • the data restoration unit 212 acquires the setting parameter ID of the communication device 10 by searching the terminal table 61 with the IP address of the transmission source of the processed data.
  • the IPv4 address is used as the IP address of the communication device 10 in FIG. 21, an IPv6 address may be used. Further, instead of the IP address, another address such as a MAC (Media Access Control) address may be used.
  • the terminal ID is provided separately from the IP address, the terminal ID may not be provided.
  • step S1502 the data restoration unit 212 searches the setting parameter table 62 with the setting parameter ID acquired in step S1501 and acquires the setting parameter corresponding to the communication device 10. As shown in FIG. 22, the setting parameter table 62 stores the setting parameter for each setting parameter ID.
  • step S1503 the data restoration unit 212 restores the unprocessed communication data from the processed data transmitted by the communication unit 211 based on the setting parameters acquired in step S1502. Specifically, the data restoration unit 212 deletes the leading 0 (1 bit) and the bit length (7 bit) of the corresponding portion in the data format portion of the processed data shown in FIG. 12, and the communication data portion represented by the bit length. Take out. Further, the data restoration unit 212 retrieves a pattern code from the setting parameter for the data format portion shown in FIG. 11 in the processed data and replaces it with the corresponding data pattern.
  • step S1504 the data restoration unit 212 registers the communication data restored in step S1503 in the sensor data table 63. At this time, the data restoration unit 212 may register the communication data in the sensor data table 63 after adjusting the format of the communication data as necessary.
  • the communication unit 211 receives the parameter change message. Then, the communication unit 211 transmits to the setting adjustment unit 213 the part from which the 8-bit identifier is removed from the parameter change message, that is, the adjustment parameter together with the IP address of the transmission source of the parameter change message.
  • the adjustment parameter is transmitted, the operation of the setting adjustment unit 213 is started.
  • step S1601 the setting adjustment unit 213 acquires the setting parameter ID of the communication device 10 from the terminal table 61, as in step S1501 of FIG.
  • step S1602 the setting adjustment unit 213 searches the setting parameter table 62 similarly to the processing in step S1502 of FIG. 20, and specifies the setting parameter corresponding to the communication device 10.
  • step S1603 the setting adjustment unit 213 replaces the setting parameter specified in step S1602 with the adjustment parameter transmitted by the communication unit 211.
  • step S1604 the setting adjustment unit 213 requests the communication unit 211 to transmit the parameter change response to the communication device 10 together with the IP address of the communication device 10. Then, the communication unit 211 controls the communication modem 24 to transmit the parameter change response shown in FIG. 19 to the communication device 10.
  • the communication device 10 acquires the communication acquired when operating in some operation modes (detection mode and adjustment mode) of the plurality of operation modes.
  • the setting parameter 51 is adjusted based on the data, and the setting parameter 51 is not adjusted based on the communication data acquired when operating in another operation mode (normal mode). Therefore, the resources are not constantly used for the adjustment processing of the setting parameters, and it is possible to suppress the steady resource usage.
  • the communication device 10 sets a detection mode period with a random cycle and a random length, and extracts a data pattern from the communication data acquired during that period. Then, the period of the adjustment mode is set with a random period and a random length, and the data pattern is evaluated based on the communication data acquired during the period. Accordingly, the setting parameter 51 can be adjusted based on communication data at various points without always adjusting the setting parameter 51.
  • the communication device 10 adjusts the setting parameter 51, not the server 20. Therefore, it is possible to prevent the processing load from being concentrated on the server 20 that communicates with many communication devices 10.
  • the server 20 saves and uses the setting parameter 51 generated by the communication device 10 for each communication device 10.
  • the server 20 may merge the setting parameters 51 generated by the respective communication devices 10 to generate one setting parameter and distribute it to the respective communication devices 10.
  • the adjustment of the setting parameter 51 by one communication device 10 is reflected in the setting parameter 51 of all the communication devices 10.
  • each functional component is realized by software.
  • each functional component may be realized by hardware.
  • the points different from the first embodiment will be described.
  • the communication device 10 includes an electronic circuit instead of the processor 11, the ROM 12, and the RAM 13.
  • the electronic circuit is a dedicated circuit that realizes the function of each functional component.
  • the server 20 includes an electronic circuit instead of the processor 21, the HDD 22, and the RAM 23.
  • the electronic circuit is a dedicated circuit that realizes the function of each functional component.
  • the electronic circuit may be a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, a logic IC, a GA (Gate Array), an ASIC (Application Specific Integrated Circuit), or an FPGA (Field-Programmable Gate Array). To be done.
  • Each functional component may be realized by one electronic circuit, or each functional component may be dispersed and realized in a plurality of electronic circuits.
  • ⁇ Modification 3> As a modified example 3, some of the functional components may be realized by hardware, and the other functional components may be realized by software.
  • the processors 11 and 21 and the electronic circuit are called a processing circuit. That is, the function of each functional component is realized by the processing circuit.
  • Embodiment 2 In the first embodiment, the detection mode and the adjustment mode are randomly started.
  • the second embodiment is different from the first embodiment in that the detection mode and the adjustment mode are started at the timing when the adjustment of the setting parameter 51 becomes necessary. In the second embodiment, these different points will be described, and description of the same points will be omitted.
  • the communication device 10 differs from the communication device 10 shown in FIG. 2 in that the communication device 10 includes an index sensor 161.
  • the index sensor 161 is a sensor that collects index data, which is communication data serving as an index of the state of the communication device 10.
  • the index sensor 161 may be any one of the plurality of sensors 16 or may be a sensor different from the plurality of sensors 16.
  • the index sensor 161 is a device that receives a positioning signal from a positioning satellite such as a GPS satellite and outputs position data indicating a position as index data.
  • the index sensor 161 may be another device such as a device that outputs time data such as a real-time clock or UTC (Coordinated Universal Time).
  • the functional configuration of the communication device 10 according to the second embodiment will be described with reference to FIG.
  • the communication device 10 differs from the communication device 10 shown in FIG. 4 in that the non-volatile memory 18 stores the compression failure information 54, the current index data 55, the communication data counter 56, and the compressed data counter 57.
  • the operation of the communication system 100 according to the second embodiment will be described with reference to FIGS. 26 to 33.
  • the operation of the communication system 100 according to the second embodiment corresponds to the communication method according to the second embodiment.
  • the operation of the communication system 100 according to the second embodiment corresponds to the processing of the communication program according to the second embodiment.
  • a data pattern that is a data fragment in communication data and a data size that is larger than a data fragment that uniquely indicates the data fragment As the setting parameter 51, a data pattern that is a data fragment in communication data and a data size that is larger than a data fragment that uniquely indicates the data fragment.
  • a dictionary in which a pair with a pattern code that is a small code is registered is used.
  • the data compression and decompression methods are also the same as in the first embodiment.
  • the operation of the communication device 10 will be described.
  • the operation of the server 20 is the same as that of the first embodiment.
  • step S2001 the data acquisition unit 111 determines whether index data has been acquired from the index sensor 161.
  • step S2002 the data acquisition unit 111 advances the process to step S2002.
  • step S2003 the data acquisition unit 111 transmits the index data acquired from the index sensor 161 to the mode management unit 112.
  • step S2003 the data acquisition unit 111 determines whether communication data has been acquired from any of the sensors 16. When the data acquisition unit 111 acquires communication data from the sensor 16, the process proceeds to step S2004. On the other hand, when the communication data is not acquired from the sensor 16, the data acquisition unit 111 returns the process to step S2001. In step S2004, the data acquisition unit 111 transmits the communication data acquired from the sensor 16 to the data processing unit 113.
  • steps S2201 and S2203 are the same as the processing of steps S1201 and S1203 of FIG.
  • step S 2202 the data processing unit 113 sends the communication data before processing in step S 1201 and the processed data after processing in step S 1201 to the setting adjustment unit 114. That is, the data processing unit 113 is different from the first embodiment in that not only communication data but also processed data is transmitted to the setting adjustment unit 114.
  • steps S2302 to S2309 is the same as the processing of steps S1302 to S1309 of FIG.
  • step S2301 the setting adjustment unit 114 differs from step S1301 in FIG. 15 in that the processing proceeds to step S2310 when the measurement mode is set.
  • step S2310 the setting adjustment unit 114 adds the data length of the communication data before being processed in step S1201 to the communication data counter 56. Also, the setting adjustment unit 114 adds the data length of the processed data processed in step S1201 to the compressed data counter 57.
  • the initial values of the communication data counter 56 and the compressed data counter 57 are 0.
  • the operation of the mode management unit 112 according to the second embodiment will be described with reference to FIGS. 29 and 30.
  • the processes of steps S2101 to S2103 are the same as the processes of steps S1101 to S1103 of FIG.
  • step S2104 the mode management unit 112 initializes the current index data 55.
  • step S2105 the mode management unit 112 determines whether the index data has been transmitted from the data acquisition unit 111. When the index data is transmitted, the mode management unit 112 advances the process to step S2106. On the other hand, when the index data has not been transmitted, the mode management unit 112 determines whether the index data has been transmitted again after the elapse of a certain time.
  • step S2106 the mode management unit 112 determines which one of the normal mode, the detection mode, the adjustment mode, and the measurement mode the communication device 10 is set to.
  • the mode management unit 112 advances the process to step S2107 when the normal mode or the measurement mode is set.
  • the mode management unit 112 advances the process to step S2113.
  • step S2107 the mode management unit 112 searches the compression failure information 54 for the number of times of the index data transmitted from the data acquisition unit 111. As shown in FIG. 31, the compression failure information 54 indicates the number of times for each index data.
  • step S2108 the mode management unit 112 determines whether or not the number of times of the index data retrieved from the compression failure information 54 in step S2107 is retrieved and the number is greater than the reference number. If the number of times is searched and the number of times is greater than the reference number, the mode management unit 112 determines that the setting parameter 51 needs to be adjusted and advances the process to step S2108.
  • the mode management unit 112 determines that the setting parameter 51 does not need to be adjusted when the number of times is not searched and/or the number of times is equal to or less than the reference number, To Step S2113. Since the compression failure information 54 is stored in the non-volatile memory 18, the data will not be lost even when the communication device 10 is powered off once. That is, it is possible to perform the processing by referring to the data of the compression failure information 54 stored at the previous startup.
  • step S2113 the mode management unit 112 waits until the timer 17 times out.
  • the process proceeds to step S2114.
  • the mode management unit 112 returns the process to step S2105 if the timeout does not occur even after the elapse of a certain time.
  • step S2114 the mode management unit 112 determines which one of the normal mode, the measurement mode, the detection mode, and the adjustment mode the communication device 10 is set to.
  • the mode management unit 112 advances the process to step S2115.
  • the mode management unit 112 advances the process to step S2118.
  • the mode management unit 112 advances the process to step S2124. If the adjustment mode is set, the mode management unit 112 advances the process to step S2126.
  • step S2115 the mode management unit 112 switches the operation mode of the communication device 10 to the measurement mode and sets it because the period of the normal mode has ended due to the timeout in step S2113.
  • step S2116 the mode management unit 112 specifies the measurement time TA.
  • the measurement time TA is a predetermined time.
  • step S2117 the mode management unit 112 stores the index data transmitted from the data acquisition unit 111 in the current index data 55. Then, in step S2129, mode management unit 112 sets measurement time TA to the timeout time, starts timer 17, and returns the process to step S2105.
  • step S2114 is executed via the processing of steps S2105 to S2108 and the processing of step S2113. Then, since the operation mode is set to the measurement mode in step S2114, the process proceeds to step S2118 in step S2114.
  • step S2120 the mode management unit 112 updates the number of times corresponding to the index data stored as the current index data 55 of the compression failure information 54. Specifically, when the number of times corresponding to the index data does not exist in the compression failure information 54, the mode management unit 112 creates a record corresponding to the index data and then sets the number of times to 1. The mode management unit 112 increments the number of times when the number of times corresponding to the index data is in the compression failure information 54.
  • step S2121 the mode management unit 112 switches the operation mode of the communication device 10 to the normal mode and sets it.
  • step S2122 the mode management unit 112 sets the value of the communication data counter 56 and the value of the compressed data counter 57 to 0.
  • step S2123 the mode management unit 112 determines the measurement waiting time TM i .
  • the mode management unit 112 determines a random value satisfying TM MIN ⁇ TM i ⁇ TM MAX as the measurement waiting time TM i with respect to the predetermined minimum measurement waiting time TM MIN and maximum measurement waiting time TM MAX .
  • step S2129 the mode management unit 112 sets the measurement waiting time TM i to the timeout time, activates the timer 17, and returns the process to step S2105.
  • the normal mode and the measurement mode are repeatedly executed until the number of compression failure information 54 exceeds the reference number.
  • step S2109 the mode management unit 112 switches the operation mode of the communication device 10 to the detection mode and sets it.
  • step S2110 the mode management unit 112 determines the detection time TC i .
  • Mode management section 112 to a predetermined minimum detection time TC MIN and a maximum detection time TC MAX, to determine the random value satisfying TC MIN ⁇ TC i ⁇ TC MAX as the detection time TC i.
  • the mode management unit 112 sets the detection time TC i to the timeout time and restarts the timer 17.
  • step S2113 the mode management unit 112 sets the number of times stored in the compression failure information 54 regarding the index data retrieved in step S2107 to 0, and returns the process to step S2105.
  • step S2106 via the process of step S2105. Since the operation mode has been set to the detection mode in step S2109, the process proceeds to step S2113 in step S2106. Then, the process proceeds to step S2114 via the process of step S2113. Since the operation mode has been set to the detection mode in step S2109, the process proceeds to step S2124 in step S2114.
  • step S2125 the mode management unit 112 switches the operation mode of the communication device 10 to the adjustment mode and sets it.
  • step S2126 the mode management unit 112 determines the adjustment time TS i .
  • Mode management section 112 with respect to the minimum adjustment time TS MIN and the maximum adjustment time predetermined TS MAX, to determine the random value satisfying TS MIN ⁇ TS i ⁇ TS MAX as an adjustment time TS i.
  • step S2129 the mode management unit 112 sets the adjustment time TS i to the timeout time, activates the timer 17, and returns the process to step S2105.
  • step S2106 via the process of step S2105. Since the operation mode is set to the adjustment mode in step S2125, the process proceeds to step S2113 in step S2106. Then, the process proceeds to step S2114 via the process of step S2113. Since the operation mode has been set to the adjustment mode in step S2125, the process proceeds to step S2126 in step S2114.
  • step S2126 the mode management unit 112 switches the operation mode of the communication device 10 to the normal mode and sets it.
  • step S2127 the mode management unit 112 determines the measurement waiting time TM i .
  • the mode management unit 112 determines a random value satisfying TM MIN ⁇ TM i ⁇ TM MAX as the measurement waiting time TM i with respect to the predetermined minimum measurement waiting time TM MIN and maximum measurement waiting time TM MAX .
  • step S2128 the mode management unit 112 sets 0 to the value of the communication data counter 56 and the value of the compressed data counter 57.
  • step S2129 the mode management unit 112 sets the measurement waiting time TM i to the timeout time, activates the timer 17, and returns the process to step S2105.
  • the mode management unit 112 uses the timer 17 to switch the measurement mode from the normal mode to the measurement mode at random timing and measure the compression rate. Then, the mode management unit 112 switches from the normal mode or the measurement mode to the detection mode when the number of times that the compression rate of the index data is bad exceeds the reference number.
  • the normal mode and the measurement mode are repeatedly executed from time t0 to time t5, and the detection mode is executed from time t5 to time t6 because the number of times that the compression ratio of the index data is bad exceeds the reference number. .. Then, after the adjustment mode is executed from time t6 to time t7, the normal mode is executed from time t7.
  • FIG. 33 shows a specific operation example for adjusting the setting parameter 51 according to the second embodiment.
  • the communication device 10 is an in-vehicle device and the index data is position data.
  • FIG. 33 shows a state in which a vehicle equipped with the communication device 10 travels back and forth from home to work. It is assumed that there is a mountain road section on the route between the home and the workplace, and it is necessary to adjust the setting parameter 51 for the communication data acquired in this section. At this time, the measurement period in which the communication device 10 is in the measurement mode occurs randomly on the route.
  • the communication device 10 measures the data compression rate when the current setting parameter 51 is used during the measurement period that starts at random timing, and uses the index. The number of times the compression ratio is bad is counted for each data value. Then, when the number of times the compression ratio of a certain index data is bad exceeds the reference number, the communication device 10 adjusts the setting parameter 51 when the index data is obtained. As a result, the setting parameter 51 can be adjusted based on the communication data at an appropriate time without adjusting the setting parameter 51 at all times.
  • Embodiment 3 the adjustment parameter 53 is immediately generated from the communication data acquired during the detection period.
  • the third embodiment differs from the first and second embodiments in that communication data is accumulated during the detection period and the adjustment parameter 53 is generated when the processing load is low. In the third embodiment, these different points will be described, and description of the same points will be omitted. In addition, in the third embodiment, a case where a function is added to the first embodiment will be described. However, it is possible to add a function to the second embodiment as well.
  • the CPU usage rate is used as the processing load.
  • the present invention is not limited to this, and it is also possible to handle the usage status of other resources such as the free memory space as the processing load.
  • the communication device 10 differs from the communication device 10 shown in FIG. 4 in that the adjustment data 58 is stored in the non-volatile memory 18.
  • the adjustment data 58 is data having a buffer structure of a FIFO (First-In First-Out) that temporarily stores communication data.
  • FIFO First-In First-Out
  • the operation of the communication system 100 according to the third embodiment will be described with reference to FIGS. 35 and 36.
  • the operation of the communication system 100 according to the third embodiment corresponds to the communication method according to the third embodiment.
  • the operation of the communication system 100 according to the third embodiment corresponds to the processing of the communication program according to the third embodiment.
  • the operation of the mode management unit 112 according to the third embodiment will be described with reference to FIG.
  • the processes of steps S3101 to S3109 are the same as the processes of steps S1101 to S1109 of FIG.
  • the processes of steps S3112 to S3114 are the same as the processes of steps S1110 to S1112 of FIG.
  • step S3110 the mode management unit 112 determines whether communication data is stored in the adjustment data 58. If the communication data is stored in the adjustment data 58, the mode management unit 112 has completed the generation of the adjustment parameter 53, and the process proceeds to step S3111. On the other hand, when the communication data is not stored in the adjustment data 58, the mode management unit 112 does not complete the generation of the adjustment parameter 53, and the process proceeds to step S3112.
  • step S3111 the mode management unit 112 determines the adjustment time TS i . Mode management section 112, with respect to the minimum adjustment time TS MIN and the maximum adjustment time predetermined TS MAX, to determine the random value satisfying TS MIN ⁇ TS i ⁇ TS MAX as an adjustment time TS i. Then, in step S3114, mode management unit 112 sets adjustment time TS i to the timeout time and activates timer 17.
  • steps S3311 to S3314 is the same as the processing of steps S1306 to S1309 of FIG.
  • step S3301 the setting adjustment unit 114 determines which one of the normal mode, the detection mode, and the adjustment mode the communication device 10 is set to. If the normal mode is set, the setting adjustment unit 114 advances the process to step S3311. If the detection mode is set, the setting adjustment unit 114 advances the process to step S3302. If the adjustment mode is set, the setting adjustment unit 114 advances the process to step S3309.
  • step S3302 the setting adjustment unit 114 determines whether the CPU usage rate is equal to or lower than the reference. That is, the setting adjustment unit 114 determines whether the processing load is less than or equal to the reference load. If the CPU usage rate is not lower than the reference, the setting adjustment unit 114 advances the process to step S3303. On the other hand, when the CPU usage rate is equal to or lower than the reference, the setting adjustment unit 114 advances the process to step S3304. In step S3303, since the processing load is high, the setting adjustment unit 114 stores the communication data transmitted by the data processing unit 113 in the adjustment data 58 in order to postpone the processing, and ends the processing.
  • step S3304 the setting adjustment unit 114 determines whether or not data is registered in the pattern table 52. If the data is not registered, the setting adjustment unit 114 advances the process to step S3305. On the other hand, when the data is registered, the setting adjustment unit 114 advances the process to step S3306. In step S3305, the setting adjustment unit 114 copies the data pattern registered in the setting parameter 51 to the pattern table 52. In step S3306, the setting adjustment unit 114 stores the communication data transmitted by the data processing unit 113 in the adjustment data 58. In step S3307, the setting adjustment unit 114 extracts a data pattern from the communication data stored in the adjustment data 58 and registers it in the pattern table 52.
  • the setting adjustment unit 114 may extract the data pattern at once from all the communication data stored in the adjustment data 58. Further, when the amount of data stored in the adjustment data 58 is large, the setting adjustment unit 114 processes only the communication data of a certain size from the beginning, and the remaining communication data is processed at the next call. Good. In step S3308, the setting adjustment unit 114 deletes, from the adjustment data 58, the communication data whose data pattern has been extracted in step S3307.
  • step S3309 the setting adjustment unit 114 determines whether communication data is stored in the adjustment data 58. If the adjustment data 58 includes communication data, the setting adjustment unit 114 proceeds with the process to step S3307, and extracts a data pattern from the communication data stored in the adjustment data 58. On the other hand, if the adjustment data 58 does not include communication data, the setting adjustment unit 114 advances the process to step S3310. In step S3310, the setting adjustment unit 114 searches the communication data transmitted from the data processing unit 113 for a data pattern registered in the pattern table 52. When the data pattern is searched, the setting adjustment unit 114 increments the number of appearances of the data pattern.
  • the communication device 10 extracts the data pattern during the period when the processing load in the detection mode is low. Therefore, the maximum value of the processing load when adjusting the setting parameter 51 can be lowered.
  • the data pattern extraction in the detection mode is executed when the processing load is low.
  • the number of appearances in the adjustment mode may be similarly measured when the processing load is low.
  • 10 communication device 11 processor, 12 ROM, 13 RAM, 14 wireless modem, 15 antenna, 16 sensor, 17 timer, 18 non-volatile memory, 19 communication bus, 111 data acquisition unit, 112 mode management unit, 113 data processing unit, 114 setting adjusting unit, 115 setting changing unit, 116 transmitting unit, 161, index sensor, 20 server, 21 processor, 22 HDD, 23 RAM, 24 communication modem, 25 communication bus, 211 communication unit, 212 data restoration unit, 213 setting adjustment Section, 30 wireless network, 40 network, 51 setting parameter, 52 pattern table, 53 adjustment parameter, 54 compression failure information, 55 current index data, 56 communication data counter, 57 compression data counter, 58 adjustment data, 61 terminal table, 62 Setting parameter table, 63 sensor data table, 100 communication system.

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  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Information Transfer Between Computers (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

La présente invention porte sur un dispositif de communication (10), dans lequel une unité d'acquisition de données (111) acquiert des données de communication. Une unité de traitement de données (113) traite les données de communication afin de générer des données traitées, qui sont des données de communication compressées, en fonction de paramètres de réglage partagés avec un dispositif de communication destinataire. Une unité d'ajustement de réglages (114) ajuste les paramètres de réglage en fonction des données de communication acquises par l'unité d'acquisition de données quand le dispositif de communication (10) fonctionne dans certains modes parmi une pluralité de modes de fonctionnement, qui sont commutés par une unité de gestion de mode (112) ; et l'unité d'ajustement de réglages (114) n'ajuste pas les paramètres de réglage en fonction des données de communication acquises par l'unité d'acquisition de données quand le dispositif de communication (10) fonctionne dans d'autres modes de fonctionnement.
PCT/JP2019/007729 2019-02-28 2019-02-28 Dispositif, système, procédé et programme de communication WO2020174637A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011105463A1 (fr) * 2010-02-23 2011-09-01 日本電気株式会社 Dispositif de compression de données, procédé de compression de données et support de stockage de programme
JP2017173982A (ja) * 2016-03-22 2017-09-28 パナソニックＩｐマネジメント株式会社 ログ収集装置、ログ生成装置、およびログ収集方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011105463A1 (fr) * 2010-02-23 2011-09-01 日本電気株式会社 Dispositif de compression de données, procédé de compression de données et support de stockage de programme
JP2017173982A (ja) * 2016-03-22 2017-09-28 パナソニックＩｐマネジメント株式会社 ログ収集装置、ログ生成装置、およびログ収集方法

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