COMMUNICATION SYSTEM, COMMUNICATION DEVICE, AND ABNORMALITY MONITORING METHOD

Abstract

To achieve rapid and efficient identification of an abnormal event.SOLUTION: A communication system includes a first communication device and a second communication device. The first communication device includes a first logging processing unit for executing logging processing for recording the operation of its own device, a first control unit for monitoring whether an abnormality has occurred, and stopping logging processing by the first logging processing unit when occurrence of abnormality is detected, a generating unit for generating a trigger signal instructing to stop the logging processing when occurrence of abnormality is detected, and a transmitting unit for transmitting the generated trigger signal. The second communication device includes a second logging processing unit for executing logging processing for recording the operation of its own device, a receiver for receiving a trigger signal, and a second control unit for stopping the logging processing by the second logging processing unit when the trigger signal is received.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a communication system, a communication device, and an abnormality monitoring method. [Background technology]

[0002] In recent years, with the development of Internet of Things (IoT) services, for example, communication systems are becoming compatible with services with diverse requirements. For this reason, in addition to the standard technologies of fourth generation mobile communications (4G), the communication standards of fifth generation mobile communications (5G or New Radio (NR)) are being required to achieve higher data rates, larger capacity, and lower latency.

[0003] Communication systems such as 5G use a variety of communication equipment from different vendors, and recently studies have been conducted on open interfaces common to all of this communication equipment.Specifically, for example, an industry group called the Open Radio Access Network Alliance (O-RAN Alliance), which was established in 2018, is working to develop interfaces that will enable interoperability between communication equipment from different vendors. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 05-100761 [Patent Document 2] JP 2002-026909 A [Patent Document 3] JP 2001-326916 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, when an abnormality such as a failure of a communication device occurs, it takes time to identify the abnormal event because the operation of the communication device varies from vendor to vendor. In other words, when a communication system is composed of multiple communication devices from different vendors, the functions required for log analysis when an abnormality occurs are not unified, and the identification and investigation of the abnormal event may not be performed quickly and efficiently. In particular, a communication system also incorporates devices for monitoring the communication state, such as a packet capture device or a spectrum analyzer, and many communication devices are combined and connected in various patterns. For this reason, it is difficult to identify the location and cause of the abnormality from each communication device that is implemented with different functions for each vendor.

[0006] The disclosed technology has been made in consideration of the above points, and aims to provide a communication system, a communication device, and an abnormality monitoring method that can quickly and efficiently identify abnormal events. [Means for solving the problem]

[0007] In one aspect, the communication system disclosed in the present application is a communication system having a first communication device and a second communication device, wherein the first communication device has a first logging processing unit that performs a logging process to record the operation of the first communication device, a first control unit that monitors whether an abnormality has occurred and stops the logging process by the first logging processing unit when an abnormality is detected, a generation unit that generates a trigger signal that instructs the logging process to be stopped when the occurrence of an abnormality is detected by the first control unit, and a transmission unit that transmits the trigger signal generated by the generation unit, and the second communication device has a second logging processing unit that performs a logging process to record the operation of the first communication device, a receiving unit that receives the trigger signal transmitted from the first communication device, and a second control unit that stops the logging process by the second logging processing unit when the trigger signal is received by the receiving unit. Effect of the Invention

[0008] According to one aspect of the communication system, communication device, and anomaly monitoring method disclosed in the present application, it is possible to achieve rapid and efficient identification of an abnormal event. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a communication system. [Diagram 2] FIG. 2 is a block diagram showing a configuration of an FH device according to an embodiment. [Diagram 3] FIG. 3 is a block diagram showing a configuration of a wireless device according to an embodiment. [Figure 4] FIG. 4 is a sequence diagram showing the abnormality monitoring method. [Diagram 5] FIG. 5 is a diagram showing a specific example of the trigger signal. [Figure 6] FIG. 6 is a diagram showing another specific example of the trigger signal. [Figure 7] FIG. 7 is a sequence diagram showing another abnormality monitoring method. [Figure 8] FIG. 8 is a sequence diagram showing yet another abnormality monitoring method. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of a communication system, a communication device, and an abnormality monitoring method disclosed in the present application will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiment.

[0011] 1 is a diagram showing an example of the configuration of a communication system according to an embodiment. This communication system includes an O-CU / DU (Open-Central Unit / Distributed Unit) 100 and O-RU (Open-Radio Unit) 200a, 200b, and 200c constituting a base station, and a terminal device 400. The communication system also includes an FH measurement device 300 that monitors a front haul (FH) line connecting the O-CU / DU 100 and the O-RU 200, and an RF (Radio Frequency) measurement device 500 that monitors a wireless line connecting the O-RU 200 and the terminal device 400.

[0012] In the following, the O-CU / DU 100, O-RUs 200a, 200b, and 200c, and FH measurement device 300 connected to the FH line may be collectively referred to as the "FH devices." Also, the terminal device 400 and RF measurement device 500 connected to the wireless line may be collectively referred to as the "wireless devices."

[0013] The O-CU / DU 100 is a baseband processing unit constituting a base station. The O-CU / DU 100 is connected to a core network (not shown) and performs baseband processing on data.

[0014] The O-RUs 200a, 200b, and 200c are radio processing units that constitute a base station. Although the O-RUs 200a, 200b, and 200c are manufactured by different vendors, they connect to a common O-CU / DU 100 and perform radio processing on data. That is, the O-RUs 200a, 200b, and 200c wirelessly transmit and receive data between the terminal equipment 400 in the cell.

[0015] The FH measurement equipment 300 monitors the FH lines connecting the O-CU / DU 100 and the O-RUs 200a, 200b, and 200c. That is, the FH measurement equipment 300 measures the number of packets transmitted and received on the FH lines between the O-CU / DU 100 and each of the O-RUs 200a, 200b, and 200c, and measures the communication speed.

[0016] Each of these FH devices executes a logging process to record its own operations as a log. However, as described below, an FH device stops logging when an abnormality is detected by any communication device in the communication system, including the FH device, and a trigger signal is transmitted.

[0017] The terminal device 400 performs wireless communication with the O-RUs 200a, 200b, and 200c that form the cell in which the terminal device 400 is located.

[0018] The RF measurement device 500 monitors the wireless links connecting the O-RUs 200a, 200b, and 200c with the terminal equipment 400. That is, the RF measurement device 500 measures the radio wave intensity of the wireless links between each of the O-RUs 200a, 200b, and 200c and the terminal equipment 400, and measures the propagation environment.

[0019] Each of these wireless devices executes a logging process to record its own operation as a log, but as described below, when an abnormality is detected by any communication device in the communication system including the wireless device and a trigger signal is transmitted, the wireless device stops the logging process.

[0020] Fig. 2 is a block diagram showing the configuration of an FH device according to one embodiment. That is, Fig. 2 is a block diagram showing the configurations of an O-CU / DU 100, an O-RU 200, and an FH measurement device 300. Note that Fig. 2 shows only the configuration related to abnormality monitoring, and omits the illustration of other configurations.

[0021] The O-CU / DU 100 shown in FIG. 2 includes a communication interface unit (hereinafter abbreviated as “communication I / F unit”) 110, a processor 120, and a memory 130.

[0022] The communication I / F unit 110 is an interface that connects to other FH devices. When an abnormality is detected, the communication I / F unit 110 notifies the occurrence of the abnormality and transmits and receives a trigger signal that triggers the stop of logging processing.

[0023] The processor 120 includes, for example, a CPU (Central Processing Unit), an FPGA (Field Programmable Gate Array), or a DSP (Digital Signal Processor), and performs overall control of the O-CU / DU 100. Specifically, the processor 120 includes a monitor control unit 121, a trigger control unit 122, and a logging processing unit 123.

[0024] The monitoring control unit 121 monitors the operation of the O-CU / DU 100 and detects the occurrence of an abnormality. When the monitoring control unit 121 detects the occurrence of an abnormality, it notifies the trigger control unit 122 of the occurrence of the abnormality and instructs the logging processing unit 123 to stop the logging process. The monitoring control unit 121 also monitors whether or not a trigger signal has been received by the communication I / F unit 110, and instructs the logging processing unit 123 to stop the logging process when a trigger signal has been received.

[0025] When the occurrence of an abnormality is notified by the monitoring control unit 121, the trigger control unit 122 generates a trigger signal that notifies the occurrence of the abnormality and instructs the stopping of the logging process. Then, the trigger control unit 122 causes the trigger signal to be transmitted from the communication I / F unit 110 to the O-RU 200 and the FH measuring device 300.

[0026] The logging processing unit 123 executes a logging process for recording the operation of the O-CU / DU 100 as a log. When the logging processing unit 123 receives an instruction to stop the logging process from the monitoring control unit 121, the logging processing unit 123 stops the logging process. The log recorded by the logging process is used to identify an abnormal event. That is, the location and cause of the abnormality are identified by referring to the log after the logging process is stopped.

[0027] The memory 130 includes, for example, a random access memory (RAM) or a read only memory (ROM), and stores information used in processing by the processor 120.

[0028] The O-RU 200 shown in FIG. 2 includes a communication I / F unit 210, a processor 220, a memory 230, and a wireless communication unit 240.

[0029] The communication I / F unit 210 is an interface that connects to other FH devices. When an abnormality is detected, the communication I / F unit 210 notifies the occurrence of the abnormality and transmits and receives a trigger signal that triggers the stop of logging processing.

[0030] The processor 220 includes, for example, a CPU, an FPGA, or a DSP, and performs overall control of the O-RU 200. Specifically, the processor 220 includes a monitor control unit 221, a trigger control unit 222, and a logging processing unit 223.

[0031] The monitoring control unit 221 monitors the operation of the O-RU 200 and detects the occurrence of an abnormality. When the monitoring control unit 221 detects the occurrence of an abnormality, it notifies the trigger control unit 222 of the occurrence, and instructs the logging processing unit 223 to stop the logging process. The monitoring control unit 221 also monitors whether or not a trigger signal has been received by the communication I / F unit 210, and instructs the logging processing unit 223 to stop the logging process when a trigger signal has been received. Furthermore, when a trigger signal has been received by the communication I / F unit 210, the monitoring control unit 221 notifies the trigger control unit 222 of the occurrence.

[0032] When the trigger control unit 222 is notified of the occurrence of an abnormality by the monitoring control unit 221, the trigger control unit 222 generates a trigger signal that notifies the occurrence of the abnormality and instructs the stopping of the logging process. Then, the trigger control unit 122 transmits the trigger signal from the communication I / F unit 110 to the O-CU / DU 100 and the FH measuring device 300. Also, when the trigger control unit 222 is notified of the occurrence of an abnormality by the monitoring control unit 221 and when the trigger control unit 222 is notified of the reception of a trigger signal from the monitoring control unit 221, the trigger control unit 222 generates a trigger signal to be transmitted wirelessly. Then, the trigger control unit 122 transmits the trigger signal from the wireless communication unit 240 to the terminal device 400 and the RF measuring device 500.

[0033] The logging processor 223 executes a logging process for recording as a log the operation of the O-RU 200. When the logging processor 223 receives an instruction from the monitor and controller 221 to stop the logging process, the logging processor 223 stops the logging process.

[0034] The memory 230 includes, for example, a RAM or a ROM, and stores information used in processing by the processor 220.

[0035] The wireless communication unit 240 is an interface capable of wireless communication with the terminal device 400 and the RF measuring device 500, which are wireless devices. The wireless communication unit 240 wirelessly transmits a trigger signal generated by the trigger control unit 222 to the terminal device 400 and the RF measuring device 500.

[0036] The FH measurement device 300 shown in FIG.

[0037] The communication I / F unit 310 is an interface that connects to other FH devices. When an abnormality is detected, the communication I / F unit 310 notifies the occurrence of the abnormality and transmits and receives a trigger signal that triggers the stop of logging processing.

[0038] The processor 320 includes, for example, a CPU, an FPGA, or a DSP, and generally controls the entire FH measurement device 300. Specifically, the processor 320 includes a monitor control unit 321, a trigger control unit 322, and a logging processing unit 323.

[0039] The monitoring control unit 321 monitors the operation of the FH measuring device 300 and detects the occurrence of an abnormality. If the monitoring control unit 321 detects the occurrence of an abnormality, it notifies the trigger control unit 322 of the occurrence of the abnormality and instructs the logging processing unit 323 to stop the logging process. The monitoring control unit 321 also monitors whether or not a trigger signal has been received by the communication I / F unit 310, and instructs the logging processing unit 323 to stop the logging process when a trigger signal has been received.

[0040] When the occurrence of an abnormality is notified from the monitoring control unit 321, the trigger control unit 322 generates a trigger signal that notifies the occurrence of the abnormality and instructs the stopping of the logging process. Then, the trigger control unit 322 causes the trigger signal to be transmitted from the communication I / F unit 310 to the O-CU / DU 100 and the O-RU 200.

[0041] The logging processor 323 executes a logging process for recording as a log the operation of the FH measurement device 300. When the logging processor 323 receives an instruction from the monitor and controller 321 to stop the logging process, the logging processor 323 stops the logging process.

[0042] The memory 330 includes, for example, a RAM or a ROM, and stores information used in processing by the processor 320.

[0043] Fig. 3 is a block diagram showing the configuration of a wireless device according to an embodiment. That is, Fig. 3 is a block diagram showing the configuration of a terminal device 400 and an RF measurement device 500. Note that Fig. 3 shows only the configuration related to abnormality monitoring, and omits the illustration of other configurations.

[0044] The terminal device 400 shown in FIG.

[0045] The wireless communication unit 410 is an interface that wirelessly connects to the O-RU 200. When an abnormality is detected, the wireless communication unit 410 notifies the occurrence of the abnormality and transmits or receives a trigger signal that triggers the stop of the logging process.

[0046] The processor 420 includes, for example, a CPU, an FPGA, or a DSP, and performs overall control of the terminal device 400. Specifically, the processor 420 includes a monitor control unit 421, a trigger control unit 422, and a logging processing unit 423.

[0047] The monitoring control unit 421 monitors the operation of the terminal device 400 and detects the occurrence of an abnormality. When the monitoring control unit 421 detects the occurrence of an abnormality, it notifies the trigger control unit 422 of the occurrence of the abnormality and instructs the logging processing unit 423 to stop the logging process. The monitoring control unit 421 also monitors whether or not a trigger signal has been received by the wireless communication unit 410, and instructs the logging processing unit 423 to stop the logging process when a trigger signal has been received.

[0048] When the occurrence of an abnormality is notified from the monitoring control unit 421, the trigger control unit 422 generates a trigger signal that notifies the occurrence of the abnormality and instructs the logging process to be stopped. Then, the trigger control unit 422 wirelessly transmits the trigger signal from the wireless communication unit 410 to the O-RU 200 and the RF measurement device 500.

[0049] The logging processing unit 423 executes a logging process for recording as a log the operation of the terminal device 400. Then, when the logging processing unit 423 receives an instruction from the monitor control unit 421 to stop the logging process, it stops the logging process.

[0050] The memory 430 includes, for example, a RAM or a ROM, and stores information used for processing by the processor 420.

[0051] The RF measurement device 500 shown in FIG.

[0052] The wireless communication unit 510 is an interface that wirelessly connects to the O-RU 200. When an abnormality is detected, the wireless communication unit 510 notifies the occurrence of the abnormality and transmits or receives a trigger signal that triggers the stop of the logging process.

[0053] The processor 520 includes, for example, a CPU, an FPGA, or a DSP, and performs overall control of the RF measuring device 500. Specifically, the processor 520 includes a monitor control unit 521, a trigger control unit 522, and a logging processing unit 523.

[0054] The monitoring control unit 521 monitors the operation of the RF measuring device 500 and detects the occurrence of an abnormality. When the monitoring control unit 521 detects the occurrence of an abnormality, it notifies the trigger control unit 522 of the occurrence of the abnormality and instructs the logging processing unit 523 to stop the logging process. The monitoring control unit 521 also monitors whether or not a trigger signal has been received by the wireless communication unit 510, and instructs the logging processing unit 523 to stop the logging process when a trigger signal has been received.

[0055] When the occurrence of an abnormality is notified from the monitoring control unit 521, the trigger control unit 522 generates a trigger signal that notifies the occurrence of the abnormality and instructs the logging process to be stopped. Then, the trigger control unit 522 wirelessly transmits the trigger signal from the wireless communication unit 510 to the O-RU 200 and the terminal device 400.

[0056] The logging processing unit 523 executes a logging process for recording as a log the operation of the RF measuring device 500. Then, when the logging processing unit 523 receives an instruction from the monitor control unit 521 to stop the logging process, the logging processing unit 523 stops the logging process.

[0057] The memory 530 includes, for example, a RAM or a ROM, and stores information used for processing by the processor 520.

[0058] Next, an abnormality monitoring method in the communication system configured as above will be described with reference to the sequence diagram shown in Fig. 4. Here, an operation when an abnormality is detected in the O-CU / DU 100 will be described.

[0059] When an abnormality occurs in the O-CU / DU 100, the abnormality is detected by the monitoring control unit 121 (step S101). This abnormality is detected, for example, when a parameter related to a signal exceeds a predetermined threshold value in a communication process by the O-CU / DU 100, or when the operation of the O-CU / DU 100 is different from normal.

[0060] When an abnormality is detected, the fact is notified to the trigger control unit 122, and a trigger signal is generated by the trigger control unit 122 (step S102). Specifically, for example, in the signal format transmitted and received between FH devices shown in Fig. 5, a trigger signal is generated in which the reserved bit 625 is changed to a bit (e.g., "1") that notifies the occurrence of an abnormality and instructs the stopping of logging processing.

[0061] 5 has a header 610 and a payload 620. The header 610 includes information indicating the type of message, source and destination identification information, and message sequence number information. The payload 620 includes, for example, time resource information 621, frequency resource information 622, and IQ information 623. The IQ information 623 is a bit area used for transmitting user data, while the reserved bits 625 are spare bits that belong to the IQ information 623 but are not used for transmitting user data or the like.

[0062] When generating a trigger signal, the trigger control unit 122 generates the trigger signal by changing the reserved bit 625 from a normal bit (for example, "0") to a bit (for example, "1") different from the normal bit (for example, "0") in a signal of the signal format shown in Fig. 5. Note that the trigger signal generated by the trigger control unit 122 is not limited to the signal format shown in Fig. 5, and the trigger signal may be generated using reserved bits or extended bits of various signal formats transmitted and received by the FH device.

[0063] The generated trigger signal is transmitted from communication I / F unit 110 to O-RU 200 and FH measurement device 300 (step S103). When the trigger signal is received by communication I / F unit 210 of O-RU 200, reception of the trigger signal is detected by monitoring control unit 221. Then, trigger control unit 222 is notified of the reception of the trigger signal, and trigger control unit 222 generates a trigger signal to be transmitted wirelessly (step S104). Specifically, for example, in the report signal shown in Fig. 6, resource blocks 701 and 702 of the same symbol as a Primary Synchronization Signal (PSS) notify the occurrence of an abnormality and generate a trigger signal including a signal pattern that instructs the stopping of logging processing.

[0064] The broadcast signal shown in Fig. 6 is called an SSB (SS / PBCH Block), and is a signal including a synchronization signal (SS) and a broadcast channel (PBCH). The SSB is composed of four symbols, the first symbol including a PSS, the second symbol including a PBCH, the third symbol including a PBCH and a secondary synchronization signal (SSS), and the fourth symbol including a PBCH. Since the resource blocks before and after the PSS of the first symbol of this SSB are free areas, the trigger control unit 222 generates a trigger signal by mapping a signal pattern indicating a trigger signal to the free areas of resource blocks 701 and 702. Note that the trigger signal generated by the trigger control unit 222 is not limited to the SSB shown in Fig. 6, and the trigger signal may be generated using free areas of various signals wirelessly transmitted from the O-RU 200.

[0065] The generated trigger signal is wirelessly transmitted from the wireless communication unit 240 to the terminal device 400 and the RF measuring device 500 (step S105). When the trigger signal is received by the wireless communication units 410, 510 of the terminal device 400 and the RF measuring device 500, respectively, the reception of the trigger signal is detected by the monitoring control units 421, 521. Then, the logging processing by the logging processing units 423, 523 is stopped by an instruction from the monitoring control units 421, 521 (step S106).

[0066] In addition, in the O-CU / DU 100, since the monitoring control unit 121 detects an abnormality, the logging processing by the logging processing unit 123 is stopped in response to an instruction from the monitoring control unit 121 (step S106). In the O-RU 200, since the monitoring control unit 221 detects receipt of a trigger signal, the logging processing by the logging processing unit 223 is stopped in response to an instruction from the monitoring control unit 221 (step S106). Similarly, in the FH measuring device 300, since the monitoring control unit 321 detects receipt of a trigger signal, the logging processing by the logging processing unit 323 is stopped in response to an instruction from the monitoring control unit 321 (step S106).

[0067] In this way, when an abnormality is detected in one communication device (here, O-CU / DU100), a trigger signal is transmitted to all communication devices constituting the communication system, and the communication device that detected the abnormality and the communication device that received the trigger signal stop logging processing. In other words, when an abnormality occurs, all communication devices constituting the communication system stop logging processing almost simultaneously, so that logs of each communication device at the same time up until the abnormality occurrence can be easily compared and referenced, and the abnormal event can be efficiently identified. In other words, it is possible to quickly and efficiently identify the abnormal event.

[0068] As described above, according to this embodiment, a communication device that detects an abnormality transmits a trigger signal to all communication devices in the communication system instructing them to stop logging processing, and stops logging processing. Then, the communication device that receives the trigger signal also stops logging processing. Therefore, when an abnormality occurs, all communication devices that make up the communication system stop logging processing almost simultaneously, and logs of each communication device at the same time up until the occurrence of the abnormality can be easily compared and referenced. As a result, it is possible to quickly and efficiently identify an abnormal event.

[0069] In the above embodiment, a case has been described in which an abnormality is detected in the O-CU / DU 100 and a trigger signal is transmitted from the O-CU / DU 100 to each communication device, but the detection of an abnormality and the transmission of a trigger signal may be performed by another communication device. Two specific examples will be described below.

[0070] FIG. 7 is a sequence diagram showing a method of monitoring anomalies when an anomaly is detected in O-RU 200. In FIG.

[0071] When an abnormality occurs in the O-RU 200, the abnormality is detected by the monitoring control unit 221 (step S201). This abnormality is detected, for example, when a signal-related parameter exceeds a predetermined threshold value in communication processing by the O-RU 200, or when the operation of the O-RU 200 is different from normal.

[0072] When an abnormality is detected, the trigger control unit 222 is notified of the abnormality, and a trigger signal is generated by the trigger control unit 222 (step S202). Specifically, for example, in the signal format transmitted between FH devices shown in Fig. 5, a trigger signal is generated in which the reserved bit 625 is changed to a bit (for example, "1") that notifies the occurrence of an abnormality and instructs the stopping of logging processing. Also, for example, in the notification signal shown in Fig. 6, a trigger signal is generated in which resource blocks 701 and 702 of the same symbol as the PSS notify the occurrence of an abnormality and include a signal pattern that instructs the stopping of logging processing. That is, the trigger control unit 222 generates a trigger signal to be transmitted in the FH line and a trigger signal to be transmitted in the wireless line.

[0073] The trigger signal transmitted through the FH line is sent from the communication I / F unit 210 to the O-CU / DU 100 and the FH measurement device 300 (step S203). When the trigger signal is received by the communication I / F units 110, 310 of the O-CU / DU 100 and the FH measurement device 300, respectively, the reception of the trigger signal is detected by the monitoring and control units 121, 321. Then, in response to an instruction from the monitoring and control units 121, 321, the logging processing by the logging processing units 123, 323 is stopped (step S205).

[0074] Meanwhile, the trigger signal transmitted over the wireless link is sent from the wireless communication unit 240 to the terminal device 400 and the RF measuring device 500 (step S204). When the trigger signal is received by the wireless communication units 410, 510 of the terminal device 400 and the RF measuring device 500, respectively, the reception of the trigger signal is detected by the monitoring and control units 421, 521. Then, the logging processing by the logging processing units 423, 523 is stopped in response to an instruction from the monitoring and control units 421, 521 (step S205). In the O-RU 200, since the abnormality is detected by the monitoring and control unit 221, the logging processing by the logging processing unit 223 is stopped in response to an instruction from the monitoring and control unit 221 (step S205).

[0075] In this way, even if an abnormality is detected in O-RU 200, a trigger signal is sent to all communication devices constituting the communication system, and all communication devices stop logging processing. In other words, when an abnormality occurs, all communication devices constituting the communication system stop logging processing almost simultaneously, so that logs of each communication device at the same time before the abnormality occurs can be easily compared and referenced, and the abnormal event can be efficiently identified. In other words, it is possible to quickly and efficiently identify the abnormal event.

[0076] Fig. 8 is a sequence diagram showing an abnormality monitoring method in the case where an abnormality is detected in the terminal device 400 and a trigger signal is transmitted by the O-CU / DU 100. In Fig. 8, the same parts as in Fig. 4 are denoted by the same reference numerals.

[0077] When an abnormality occurs in the terminal device 400, the abnormality is detected by the monitoring control unit 421 (step S301). This abnormality is detected, for example, when a parameter related to a signal exceeds a predetermined threshold value in a communication process by the terminal device 400, or when the operation of the terminal device 400 is different from normal.

[0078] When an abnormality is detected, an abnormality notification reporting the abnormality is generated by the monitoring control unit 421 and transmitted from the wireless communication unit 410 to the O-CU / DU 100 via the O-RU 200 (step S302). The abnormality notification is received by the communication I / F unit 110 of the O-CU / DU 100, and the occurrence of an abnormality in the terminal device 400 is detected by the monitoring control unit 121. The occurrence of an abnormality is then notified to the trigger control unit 122, which generates a trigger signal (step S102). Specifically, for example, in the signal format transmitted and received between the FH devices shown in FIG. 5, a trigger signal is generated in which the reserved bit 625 is changed to a bit (for example, "1") that notifies the occurrence of an abnormality and instructs the stop of logging processing.

[0079] The generated trigger signal is transmitted from communication I / F unit 110 to O-RU 200 and FH measurement device 300 (step S103). When the trigger signal is received by communication I / F unit 210 of O-RU 200, reception of the trigger signal is detected by monitoring control unit 221. Then, trigger control unit 222 is notified of the reception of the trigger signal, and trigger control unit 222 generates a trigger signal to be transmitted wirelessly (step S104). Specifically, for example, in the notification signal shown in Fig. 6, resource blocks 701 and 702 of the same symbol as the PSS notify the occurrence of an abnormality and generate a trigger signal including a signal pattern that instructs the stopping of logging processing.

[0080] The generated trigger signal is wirelessly transmitted from the wireless communication unit 240 to the terminal device 400 and the RF measuring device 500 (step S105). When the trigger signal is received by the wireless communication units 410, 510 of the terminal device 400 and the RF measuring device 500, respectively, the reception of the trigger signal is detected by the monitoring control units 421, 521. Then, the logging processing by the logging processing units 423, 523 is stopped by instruction from the monitoring control units 421, 521 (step S106). Similarly, the logging processing by the logging processing units 123, 223, 323 in the O-CU / DU 100, the O-RU 200, and the FH measuring device 300 is stopped, respectively (step S106).

[0081] In this way, when an abnormality is detected in the terminal device 400, the O-CU / DU 100 detects the abnormality by a report from the terminal device 400 and transmits a trigger signal to all communication devices, causing all communication devices to stop logging. In other words, when an abnormality occurs, all communication devices constituting the communication system stop logging almost simultaneously, so that the logs of each communication device at the same time up until the abnormality occurs can be easily compared and referenced, making it possible to efficiently identify the abnormal event. In other words, it is possible to quickly and efficiently identify the abnormal event. [Explanation of symbols]

[0082] 110, 210, 310 Communication I / F section 120, 220, 320, 420, 520 processors 121, 221, 321, 421, 521 Monitoring and control unit 122, 222, 322, 422, 522 Trigger control section 123, 223, 323, 423, 523 Logging processing unit 130, 230, 330, 430, 530 Memory 240, 410, 510 Wireless communication section

Claims

1. A communication system having a first communication device and a second communication device, The first communication device is a first logging processing unit that executes a logging process for recording an operation of the device itself; a first control unit that monitors whether an abnormality occurs in the first communication device, which is the device itself, and stops the logging process by the first logging processing unit when the occurrence of the abnormality is detected; a generation unit that generates a trigger signal that instructs the second communication device to stop a logging process when the first control unit detects an occurrence of an abnormality; a transmission unit that transmits the trigger signal generated by the generation unit, The second communication device is A second logging processing unit that executes a logging process for recording an operation of the device itself; A receiving unit that receives a trigger signal transmitted from the first communication device; and a second control unit that monitors whether or not an abnormality has occurred in the second communication device, which is the device itself, and stops the logging process by the second logging processing unit when the occurrence of an abnormality is detected or when a trigger signal is received by the receiving unit. A communication system comprising:

2. The second communication device is a generating unit configured to generate, when a trigger signal is received by the receiving unit, another trigger signal to be transmitted via a line different from the line via which the trigger signal is transmitted; a transmission unit that transmits another trigger signal generated by the generation unit using the different line; 2. The communication system of claim 1, further comprising:

3. The generation unit is A trigger signal for instructing the stop of logging processing is generated using a reserved bit or an extended bit of a signal format transmitted and received between the first communication device and the second communication device.

2. The communication system according to claim 1.

4. The generation unit is A trigger signal for instructing the stop of logging processing is generated using an empty area of ​​a signal including a synchronization signal and a notification channel transmitted and received on a wireless line.

2. The communication system according to claim 1.

5. The first control unit is Detect abnormal occurrences through reports from other devices in the communication system 2. The communication system according to claim 1.

6. a logging processing unit that executes a logging process for recording an operation of the device itself; a control unit that monitors whether an abnormality occurs and stops the logging process by the logging processing unit when the occurrence of an abnormality is detected; a generation unit that generates a trigger signal that instructs another communication device connected to the device to stop a logging process when the occurrence of an abnormality is detected by the control unit; a transmission unit that transmits the trigger signal generated by the generation unit to the other communication device; having The control unit is A communication device characterized in that, when an abnormality is detected in the own device or when the trigger signal is received from the other communication device, the communication device stops the logging process being executed in the own device.

7. A method for monitoring an abnormality in a communication system having a first communication device and a second communication device, comprising: The first communication device, Executing a logging process to record the operation of the device itself; monitor whether an abnormality has occurred in the first communication device, which is the own device, and when an abnormality has occurred, stop a logging process of the own device and generate a trigger signal to instruct the second communication device to stop the logging process; Perform a process of transmitting the generated trigger signal; The second communication device, Executing a logging process to record the operation of the device itself; receiving a trigger signal transmitted from the first communication device; The second communication device monitors whether an abnormality has occurred in the second communication device, which is the device itself, and when the occurrence of an abnormality is detected or when the trigger signal is received, executes a process of stopping the logging process of the device itself.

4. An abnormality monitoring method comprising:

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