Network measurement system and network measurement method

Abstract

To provide a network measurement system and a network measurement method, capable of accurately measuring a one-way delay of a one-way delay measurement section even in an environment in which it is difficult for a device on one end side of the one-way delay measurement section of a communication network to acquire time information synchronized with, for example, a UTC as a common clock.SOLUTION: A network measurement system 5 has a first network measurement device 50A and a second network measurement device 50B each having a GNSS receiving function, and with the first network measurement device 50A connected to UE 10 and the second network measurement device 50B disposed outside a data center 30 and connected to a server device 22, both devices measure a one-way delay between the UE 10 and the server device 22. In accordance with this, the second network measurement device 50B simultaneously measures the one-way delay and a two-way delay between itself and the server device 22 and estimates time error of the server device 22 based on results of the one-way delay and two-way delay measurements.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a network measurement system and a network measurement method for measuring one-way delay in a desired section of a communication network. [Background technology]

[0002] Some network measurement systems have communication network measurement functions such as an OWD measurement function that measures the one-way delay (OWD) in a desired section, and a time error measurement (estimation) function that measures packet time error (TE).

[0003] In order to measure one-way delay in a communication network using a network measurement system, it is necessary to place multiple units with network measurement functions at desired locations, such as the sending and receiving ends of packet transmission, and for each unit to share a common clock.

[0004] As an example of a network measurement device that enables operation using a common clock, a portable device has been known that measures a 5G network that operates in time synchronization with reference time information obtained from a GNSS (Global Navigation Satellite System) satellite, moves sequentially to desired test locations, connects to one of multiple base stations at each test location, begins positioning at the test location based on received signal information from the GNSS satellite, and measures the performance of the 5G network after achieving time synchronization with the GNSS satellite (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2023-37994 Summary of the Invention [Problem to be solved by the invention]

[0006] The conventional network measurement device described in Patent Document 1 is configured as a portable device, and each time it is moved to a test location, the GNSS antenna and receiving position are adjusted, and measurement is started only after receiving signal information from GNSS satellites can be reliably obtained (after time synchronization has been reliably achieved).

[0007] On the other hand, in a system configuration in which multiple enclosures are placed at various locations in a communication network to measure one-way delays, one example of a method for making the underlying clock common to each enclosure is to use a GNSS receiver to obtain, for example, Coordinated Universal Time (UTC) and use it as a common clock.

[0008] However, with the above-described system configuration, it is not necessarily possible to acquire signals from GNSS in all environments. For example, even if a device (e.g., a user terminal) at one end of a one-way delay section in a communication network is outdoors and time information from GNSS satellites can be acquired at the location corresponding to that device, there may be an environment in which a device (e.g., a server device) at the other end of the one-way delay section is installed inside a data sensor, making it difficult to acquire time information from GNSS satellites at the location corresponding to the other device. In such an environment, even if a housing is installed corresponding to each device at both ends of the one-way delay section, it is impossible for the devices installed inside the data center to acquire, for example, UTC as a common clock. As a result, it is impossible for both devices to share a common clock, resulting in an unavoidable decrease in the accuracy of one-way delay measurement.

[0009] As described above, in conventional network measurement systems, it was difficult for devices at one end of the one-way delay measurement section of a communication network to perform highly accurate one-way delay measurements in an environment where it was difficult for them to obtain time information synchronized with UTC, such as time information from GNSS satellites.

[0010] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a network measurement system and a network measurement method that can accurately measure the one-way delay of a one-way delay measurement section of a communication network, even in an environment where it is difficult for a device at one end of the one-way delay measurement section to obtain time information synchronized with UTC, for example. [Means for solving the problem]

[0011] In order to solve the above problem, the network measurement system according to claim 1 of the present invention is a network measurement system for measuring one-way delay between an edge connecting a server device (22) connected to a network and a terminal (10), and the server device and the terminal each have an acquisition means (52) for acquiring time information as a common clock, and the server device and the terminal are connected to the terminal or Is The network measurement system includes a first network measurement device (50A) and a second network measurement device (50B) that are arranged outside a data center and connected to the server device and that measure one-way delays (OWDup, OWDdown) in a one-way delay measurement section between the terminal and the server device in an environment affected by time information obtained from a clock (28) of the server device, and the first and second network measurement devices further include delay measurement control means (62) that performs one-way delay measurements and round-trip delay measurements in parallel with each other based on a delay measurement signal for measuring time error between the terminal and the server device in accordance with the one-way delay measurements in the one-way delay measurement section while connected to the server device, and time error estimation means (63) that estimates a time error (Terr) of the server device that reflects a time error between the time information of the common clock acquired by the acquisition means and the time information acquired from the clock, based on the measurement results (OWDte-down, OWDte-up, and TWDte) of the one-way delay measurements and the round-trip delay measurements by the delay measurement control means. The delay measurement control means performs one-way delay measurement in the one-way delay measurement section for a predetermined period at predetermined time intervals, and outputs an average value of the one-way delay measured value for the period as a one-way delay measurement result, and when the average value exceeds a predetermined threshold, the delay measurement control means controls not to output the one-way delay measurement result. It is characterized by:

[0012] With this configuration, the network measurement system according to claim 1 of the present invention can operate in an environment equivalent to when both network measurement devices can obtain time information from a common clock, even in an environment where it is difficult for one end of the one-way delay measurement section (for example, the server device) to obtain time information from a common clock, by correcting the one-way delay amount due to time errors in the server device's clock. This makes it possible to estimate the time error of the device on one end while performing one-way delay measurements on the one-way delay measurement section under conditions of high time accuracy, and to accurately measure one-way delay taking into account the estimated time error results. The network measurement system according to claim 1 of the present invention can reduce the effect of extreme variations in one-way delay measurements over a one-way delay measurement section, thereby eliminating uncertainty in the one-way delay of a communication network. The network measurement system according to claim 1 of the present invention can prevent one-way delay measurement results from fluctuating beyond a preset threshold, enabling highly accurate one-way delay measurements while also reducing the effect of time error on estimated results.

[0013] In the network measurement system according to claim 2 of the present invention, the common clock may be configured to be Coordinated Universal Time (UTC).

[0014] This configuration enables the network measurement system according to claim 2 of the present invention to operate in an environment equivalent to when both network measurement devices can acquire time information synchronized with UTC. This enables the system to estimate the time error of the device on one end while measuring the one-way delay in the one-way delay measurement section under highly accurate time conditions, and to accurately measure the one-way delay taking into account the estimated time error.

[0015] Furthermore, the network measurement system according to claim 3 of the present invention may be configured to measure one-way delays in data transmission between the terminal and the server device, the network being a communication network (1) having a core network of a predetermined communication method, the server device being connected to the core network, and an access network being located in a data center (30) for the terminal to access the core network.

[0016] With this configuration, the network measurement system according to claim 3 of the present invention can accurately measure the one-way delay between a server device in a data center and a terminal at the edge of the network via a communication network.

[0017] In addition, in the network measurement system according to claim 4 of the present invention, the access network may have a base station (11) that accommodates the terminal so that it can communicate with the access network, and the base station and the terminal may be connected by wire or wirelessly.

[0018] With this configuration, the network measurement system according to claim 4 of the present invention can measure the one-way delay between a terminal and a server device in the communication network using the same procedure, regardless of whether the base station and the terminal are connected via a wired or wireless connection within the access network.

[0019] In addition, in the network measurement system according to claim 5 of the present invention, the core network may be configured to be one of private 5G, local 5G, and a 5G core network.

[0020] With this configuration, the network measurement system of claim 5 of the present invention is able to perform more accurate one-way delay measurements on communication networks including core networks such as private 5G, local 5G, and 5G core networks.

[0021] In addition, in the network measurement system according to claim 6 of the present invention, the first network measurement device and the second network measurement device may have a transceiver unit (58) that conforms to a predetermined communication standard, and may be configured to be connected to the terminal or the server device via the communication network.

[0022] With this configuration, the network measurement system according to claim 6 of the present invention can easily construct a system configuration for measuring one-way delay between a terminal and a server device, and one-way and round-trip delay measurements between a terminal and a server device.

[0023] A network measurement system according to claim 7 of the present invention. is a network measurement system for measuring one-way delay between an edge connecting a server device (22) connected to a network and a terminal (10), the server device and the terminal each having an acquisition means (52) for acquiring time information as a common clock, the server device and the terminal each having a first network measurement device (50A) and a second network measurement device (50B) that are connected to the terminal or are connected to the server device while located outside a data center, and measure one-way delay (OWDup, OWDdown) in a one-way delay measurement section between the terminal and the server device in an environment affected by time information acquired from a clock (28) of the server device, the first network measurement device and the second network measurement device each having a delay measurement control means (62) that performs one-way delay measurement and round-trip delay measurement in parallel with one-way delay measurement in the one-way delay measurement section while connected to the server device based on a delay measurement signal for measuring time error, and the first network measurement device and the second network measurement device each having a delay measurement control means (62) that performs one-way delay measurement and round-trip delay measurement in parallel with one-way delay measurement in the one-way delay measurement section while connected to the server device, and the measurement results (OWDte-down, OWDte-up) of the one-way delay measurement and the round-trip delay measurement by the delay measurement control means , and TWDte), and a time error estimation means (63) for estimating a time error (Terr) of the server device that reflects a time error between the time information of the common clock acquired by the acquisition means and the time information obtained from the clock, and further comprising a data analysis processing device (70, 70A) arranged to be able to communicate with the first network measurement device and the second network measurement device, wherein the data analysis processing device estimates a downstream one-way delay measurement result (OWDdown) from the server device to the terminal by the first network measurement device, and The system is characterized by comprising a collection means (71) for collecting an upstream one-way delay measurement result (OWDup) from the terminal to the server device by a second network measurement device and a round trip delay measurement result (TWDte) of the server device, and a one-way delay correction means (72) for analyzing the downstream one-way delay measurement result, the upstream one-way delay measurement result, and the time error estimation result of the server device collected by the collection means, and correcting the downstream one-way delay measurement result and the upstream one-way delay measurement result based on the time error estimation result of the server device.

[0024] With this configuration, the network measurement system according to claim 7 of the present invention is Even in an environment where it is difficult for one end (e.g., the server device) to obtain time information from a common clock, correcting the one-way delay amount due to the time error of the server device's clock allows both network measurement devices to operate in an environment equivalent to when they can obtain time information from a common clock. This makes it possible to estimate the time error of the device on one end while performing one-way delay measurements for the one-way delay measurement section under conditions of high time accuracy, and to perform accurate measurements of one-way delay taking into account the time error estimation results. In the network measurement system according to claim 7 of the present invention, the one-way delay correction means of the data analysis processing device analyzes the downstream one-way delay measurement results, upstream one-way delay measurement results, and time error estimation results of the server device collected by the collection means, and then easily corrects the downstream one-way delay measurement results and upstream one-way delay measurement results based on the time error estimation result of the server device, thereby achieving more accurate one-way delay measurements. .

[0025] In addition, in the network measurement system according to claim 8 of the present invention, The common clock may be configured to be Coordinated Universal Time (UTC). .

[0026] With this configuration, the network measurement system according to claim 8 of the present invention: Both network measurement devices can operate in an environment equivalent to when they can obtain time information synchronized with UTC. This allows for highly accurate timekeeping, enabling one-way delay measurements to be performed on the one-way delay measurement section while estimating the time error of the device on one end, and enabling accurate measurements of one-way delay that take into account the estimated time error. .

[0027] Furthermore, a network measurement system according to claim 9 of the present invention comprises: The network is a communication network (1) having a core network of a predetermined communication method, the server device being connected to the core network and located in a data center (30), and an access network for the terminal to access the core network, and the one-way delay related to data transmission between the terminal and the server device is measured, and the data analysis processing device (70A) is provided in the server device constituting the communication network. This may also be configured as follows.

[0028] With this configuration, the network measurement system according to claim 9 of the present invention: By placing the data analysis processing device inside the server device, a system configuration for achieving accurate one-way delay measurement can be realized simply and inexpensively. .

[0029] In addition, in a network measurement system according to claim 10 of the present invention, The network is a communication network (1) having a core network of a predetermined communication method, the server device connected to the core network and located in a data center (30), and an access network for the terminal to access the core network, and the one-way delay related to data transmission between the terminal and the server device is measured, and the data analysis processing device (70) is located outside the communication network so as to be able to communicate with the first network measurement device and the second network measurement device. It may be a configuration.

[0030] With this configuration, the network measurement system according to claim 10 of the present invention is The data analysis processing device can be placed at any location away from the first network measurement device and the second network measurement device, improving the flexibility in building a system for achieving accurate one-way delay measurements. .

[0031] A network measurement method according to claim 11 of the present invention comprises: 2. A network measurement method for measuring one-way delay between an edge connecting the server device and the terminal connected to the network using the network measurement system according to claim 1, comprising: a connecting step (S1) of connecting the first network measurement device to the terminal and the second network measurement device installed outside the data center and connecting it to the server device; one-way delay measurement steps (S4-S6) of measuring one-way delay (OWDup, OWDdown) in the one-way delay measurement section by the first network measurement device and the second network measurement device in an environment affected by time information obtained from the clock (28) of the server device; and measuring one-way delay (OWDup, OWDdown) between the second network measurement device and the server device based on a delay measurement signal for measuring a time error in synchronization with the one-way delay measurement in the one-way delay measurement section by the second network measurement device. and a time error estimation step (S13) of estimating a time error (Terr) of the server device, which reflects a time error between the time information of the common clock acquired by the acquisition means and the time information acquired from the clock, based on the measurement results (OWDte-down, OWDte-up, and TWDte) of the one-way delay measurement and the round-trip delay measurement by the delay measurement control step. The delay measurement control step performs one-way delay measurement in the one-way delay measurement section for a predetermined period and at predetermined time intervals, and outputs an average value of the one-way delay measurement values ​​for the period as the one-way delay measurement result. The delay measurement control step controls not to output the one-way delay measurement result when the average value exceeds a predetermined threshold. .

[0032] With this configuration, the network according to claim 11 of the present invention Even in an environment where it is difficult for one end of the one-way delay measurement section (e.g., the server device) to obtain time information from a common clock, the measurement method corrects the one-way delay amount due to the time error of the server device's clock, allowing both network measurement devices to operate in an environment equivalent to when they can obtain time information from a common clock. This enables one-way delay measurements of the one-way delay measurement section to be performed under highly accurate time conditions while estimating the time error of the device at the one end, thereby enabling accurate measurement of one-way delay taking into account the estimated time error. The network measurement method of claim 11 of the present invention reduces the impact of extreme variations in one-way measurements of the one-way delay measurement section, thereby eliminating uncertainty in the one-way delay of a communication network. The network measurement method of claim 11 of the present invention prevents one-way delay measurement results from fluctuating beyond a predetermined threshold, enabling highly accurate one-way delay measurements while also reducing the impact of time error on estimated results.

[0033] In the network measurement method according to claim 12 of the present invention, the common clock may be configured to be Coordinated Universal Time (UTC). .

[0034] With this configuration, the network measurement method according to claim 12 of the present invention comprises: Both network measurement devices can operate in an environment equivalent to when they can obtain time information synchronized with UTC. This allows for highly accurate timekeeping, enabling one-way delay measurements to be performed on the one-way delay measurement section while estimating the time error of the device on one end, and enabling accurate measurements of one-way delay that take into account the estimated time error. . [Effects of the Invention]

[0035] The present invention provides a network measurement system and a network measurement method that can accurately measure the one-way delay of a one-way delay measurement section of a communication network, even in an environment where it is difficult to obtain time information synchronized with UTC, for example, by using a common clock on equipment at one end of the one-way delay measurement section. [Brief explanation of the drawings]

[0036] [Figure 1] 1 is a diagram showing an arrangement of a first network measurement device and a second network measurement device in a communication network, which constitute a network measurement system according to an embodiment of the present invention. [Figure 2] 1 is a block diagram showing the configuration of a first network measurement device of a network measurement system according to an embodiment of the present invention. [Figure 3] FIG. 3 is a block diagram showing the configuration of a second network measurement device of the network measurement system according to one embodiment of the present invention. [Figure 4] FIG. 2 is a block diagram showing the configuration of a server device to which a second network measurement device of the network measurement system according to one embodiment of the present invention is connected. [Figure 5] 4 is a flowchart illustrating a one-way delay measurement process for a communication network performed by the network measurement system according to an embodiment of the present invention. [Figure 6] 10A and 10B are diagrams showing the control sequences between a second network measurement device and a server device in a network measurement system according to one embodiment of the present invention, where (a) shows the control sequence for one-way delay measurement, (b) shows the control sequence for round-trip delay measurement, and (c) shows the control sequence for time error estimation in the server device. [Figure 7] FIG. 1 is a diagram showing a first arrangement of a data analysis processing device equipped with a one-way delay correction function in a network measurement system according to an embodiment of the present invention. [Figure 8] FIG. 10 is a diagram showing a second arrangement of a data analysis processing device equipped with a one-way delay correction function in a network measurement system according to an embodiment of the present invention. [Figure 9]2 is a conceptual diagram showing a data transmission path and a structure of transmission data corresponding to a one-way delay measurement section of the communication network shown in FIG. 1 in which a network measurement system according to one embodiment of the present invention is installed. [Figure 10] 10 is a table showing the results of one-way delay and time error estimation in the arrangement shown in FIG. 9 by the network measurement system according to one embodiment of the present invention. [Figure 11] 10 is a graph showing the results of one-way delay and time error estimation in the arrangement shown in FIG. 9 by a network measurement system according to an embodiment of the present invention. [Figure 12] FIG. 10 is a diagram showing an example of the configuration of another communication network to which the network measurement system according to the present invention can be applied. DETAILED DESCRIPTION OF THE INVENTION

[0037] (Summary of the Invention) The network measurement system according to the present invention measures the delay between an application in a data center via a network. Specifically, the network measurement system according to the present invention measures the one-way delay between a device (e.g., a server device) that runs the application and an edge that connects a terminal to the network.

[0038] The network measurement system according to the present invention is configured with network measurement devices that are respectively arranged corresponding to a server device and terminals connected to a network. Here, the server device has a clock, but there may be a time error between this clock and the clocks assumed by the two network measurement devices. The network measurement system according to the present invention has a function to correct errors in one-way delay measurement results that are caused by the time error.

[0039] (Embodiment) DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a network measurement system and a network measurement method according to the present invention will be described with reference to the accompanying drawings. First, the configuration of a communication network 1 that is the target of one-way delay measurement by a network measurement system 5 according to an embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 particularly illustrates a configuration in which the target of measurement is 5G and the core network 21 and server device 22 of the communication network 1 are located in the same data center 30. Note that the communication network 1 is merely an example of a communication network that is the target of measurement by the network measurement system 5 according to this embodiment, and is not limited to the configuration shown in Fig. 1. For example, the target of measurement may be something other than 5G, and the core network 21 and server device 22 of the communication network 1 may be located in different data centers 31 (see Fig. 12).

[0040] As shown in FIG. 1, the communication network 1 includes a user terminal (UE: User Equipment) 10, a base station (NodeB: NB) 11, a core network 21 having a predetermined communication method, and a server device 22, and is configured such that the UE 10 and the server device 22 located in a data center 30 can send and receive packets for delay measurement.

[0041] In the communication network 1, various types of 5G-compatible communication devices such as mobile communication terminals such as smartphones and PCs (personal computers) are used as the UE 10. The UE (user terminal) 10 constitutes the terminal of the present invention. The base station 11 may be, for example, a 4G base station eNB or a 5G base station gNB. The base station 11 is provided outside the data center 30.

[0042] On the other hand, the core network 21 is provided in the data center 30. The core network 21 can adopt any of private 5G (5th Generation), local 5G, a 5G core network, etc. in accordance with the specifications of the UE 10 and the base station 11.

[0043] The data center 30 is provided within a building, and includes, for example, a server device 22 having a transceiver unit 23 that transmits and receives data to and from the UE 10 via a base station 11 and a core network 21 (provided within the data center 30).

[0044] The server device 22 has functional blocks (see FIG. 4) such as a control unit 24 and a storage unit 25 in addition to the transmission / reception unit 23. The control unit 24 is configured by a computer device, and by executing a control program stored in the storage unit 25, for example, causes the server device 22 to function as a device that can provide communication services such as a data providing service that receives access from various clients and provides the requested data to the clients, and a connection service that connects the clients to the requested access destination based on the access.

[0045] In the communication network 1 having the above configuration, the UE 10 can access the server device 22 as needed and use the communication service provided by the server device 22. To smoothly operate this communication service, the UE 10 must have the capability to support the communication service in advance. Prior to such operation, a network measurement system 5 is used to evaluate the capability of the UE 10. The network measurement system 5 sets, for example, a data transmission section from the UE 10 to the server device 22 in the communication network 1 as a one-way delay measurement section, and measures the one-way delay in the one-way delay measurement section. The measurement results of this one-way delay measurement are used to evaluate the capability of the UE 10.

[0046] As shown in Fig. 1, the network measurement system 5 according to this embodiment is configured to include a network measurement device 50A and a network measurement device 50B. Although not explicitly shown in Fig. 1, the network measurement system 5 according to this embodiment is further configured to include data analysis processing devices 70 and 70A that collect and analyze measurement data related to one-way delay measurement from the network measurement devices 50A and 50B, as will be described in detail later (see Figs. 7 and 8).

[0047] Network measurement devices 50A and 50B have the same configuration and are placed (connected) at both ends (UE 10 side or server device 22 side) of the one-way delay measurement section described above. For example, when placed on the UE 10 side, network measurement devices 50A and 50B control the transmission of one-way delay measurement signals (measurement packets) from UE 10, and when placed on the server device 22 side, they capture the one-way delay measurement signals sent from UE 10 on the transmission path of server device 22 and measure the uplink one-way delay (OWD) in the delay measurement section. up ) measurement is performed. up ) is measured, for example, using Stream #2 in communication network 1.

[0048] In addition, in the same connection state as above, for example, network measurement device 50B (or network measurement device 50A) arranged on the server device 22 side controls the server device 22 to send out a one-way delay measurement signal, and network measurement device 50A (or network measurement device 50B) arranged on the UE 10 side captures the one-way delay measurement signal received by UE 10 and measures the downlink one-way delay (OWD) in the delay measurement section. down It is also possible to measure the downstream one-way delay (OWD). down ) is measured using, for example, Stream #1 in communication network 1. Network measurement devices 50A and 50B respectively constitute the first and second network measurement devices of the present invention.

[0049] Both network measurement devices 50A and 50B have a GNSS receiving function (GNSS receiver 52). Both network measurement devices 50A and 50B acquire UTC from GNSS reception information (however, if they are located corresponding to server device 22, they must be located outside data center 30), and can be used as a common clock for one-way delay measurement. Note that, although an example in which UTC is acquired and used as a common clock will be described as an embodiment of the present invention, the common clock is not limited to UTC as long as it can be used as a common clock. For example, the common clock may be configured to use Japan Standard Time (JST) or another standard.

[0050] In the configuration of network measurement devices 50A and 50B, the GNSS reception function is given as an example of a component that is effective for performing measurement processing in synchronization with a highly accurate clock synchronized with UTC. Other configurations for achieving measurement processing in synchronization with a highly accurate clock synchronized with UTC include a configuration equipped with NTP (Network Time Protocol) or PTP (Precision Time Protocol), for example.

[0051] The detailed configurations of network measurement devices 50A and 50B will be described with reference to Figures 2 and 3. Figure 2 shows the configuration of network measurement device 50A, and Figure 3 shows the configuration of network measurement device 50B. Figure 2 shows a configuration assuming that network measurement device 50B is connected to server device 22, while network measurement device 50A is connected to UE 10 via network measurement terminal 59 for operation.

[0052] (Network Measuring Instrument 50A) As shown in Figure 2, the network measurement instrument 50A is configured to have an antenna input terminal 51, a GNSS receiver 52, a signal processing device 53, a measurement module 54, a display and operation unit 55, a memory unit 56, a control unit 57, a transmission / reception unit 58, and a network measurement terminal 59.

[0053] The antenna input terminal 51 is a terminal for inputting a signal received by the GNSS antenna 45 for receiving signals transmitted from GNSS satellites. The network measuring instrument 50A has a configuration in which the GNSS antenna 45 can be attached to and detached from the antenna input terminal 51.

[0054] The GNSS receiver 52 receives the signal received by the GNSS antenna 45 and outputs it as received signal information of the GNSS satellite to the signal processing device 53 and the measurement module 54. The GNSS receiver 52 constitutes the acquisition means of the present invention.

[0055] The signal processing device 53 is a functional unit that inputs received signal information from GNSS satellites output by the GNSS receiver 52, performs various signal processing based on the received signal information, and sends the processing results to the display operation unit 55. The signal processing device 53 executes positioning processing based on the received signal information, for example, to calculate information such as the latitude, longitude, and altitude of the location, and outputs each piece of information as positioning information.

[0056] The measurement module 54 is a functional unit that executes various measurement processing operations for the communication network 1. The measurement operations performed by the measurement module 54 include measuring one-way delay (OWD) for a predetermined delay measurement section of the communication network 1. up , O.W.D. down ) (see FIGS. 1 and 5), and the one-way delay (OWD) between the server device 22 and the device when it is placed (connected) on the server device 22 side. te-up , O.W.D. te-down ), round trip delay (Two Way Delay: TWD te ), and time error (T err ) estimated function (see Figure 6).

[0057] The display operation unit 55 is composed of a touch panel that serves both as a display function and an input operation function. The display function of the display operation unit 55 displays various screens or information. The input operation function of the display operation unit 55 accepts various instruction operations, such as setting measurement conditions for one-way delay measurement, and instructions to start and end one-way delay measurement.

[0058] The storage unit 56 stores various control information necessary for one-way delay measurement, programs executed to realize the functions of a setting control unit 60, a positioning control unit 61, a delay measurement control unit 62, and a display control unit 64 in the control unit 57 described later, one-way delay measurement and round-trip delay measurement between the server device 22 and the storage unit 56 by the delay measurement control unit 62, and a time error T err It stores various information such as various control information required to estimate the above, and information on the measurement results thereof.

[0059] The control unit 57 controls the entire network measuring device 50A, and includes a setting control unit 60, a positioning control unit 61, a delay measurement control unit 62, and a display control unit 64.

[0060] The setting control unit 60 is a processing function unit that receives setting operations by the input operation function of the display operation unit 55 and sets various information corresponding to the setting operations. The setting control unit 60 performs, for example, one-way delay measurement of the one-way delay section, one-way delay measurement and round-trip delay measurement between the server device 22, and time error T err This is a functional unit that performs various settings related to the conditions for estimating the above.

[0061] The positioning control unit 61 is a functional unit that performs positioning at a given location based on received signal information from the GNSS antenna 45. The positioning control unit 61 also performs processing to extract UTC from the signal processing result of the signal processing device 53 on the received signal information received by the GNSS receiver 52, for example.

[0062] The delay measurement control unit 62 drives and controls the measurement module 54 to perform measurement operations such as one-way delay measurement (see FIG. 5) targeting the one-way delay measurement section of the communication network 1 based on the settings made by the setting control unit 60. After completing the one-way delay measurement described above, the delay measurement control unit 62 may perform a process of storing the measurement results (measurement data) of the one-way delay measurement in a predetermined storage area of ​​the memory unit 56, for example, so that the measurement results can be collected later from outside (see FIGS. 7 and 8).

[0063] The display control unit 64 controls the display of various information on the display function unit of the display operation unit 55, such as the measurement conditions set by the setting control unit 60, the positioning information obtained by the positioning control unit 61, and the one-way delay measurement results of the one-way delay section by the delay measurement control unit 62.

[0064] The transmitter / receiver 58 transmits and receives signals conforming to a predetermined communication standard to and from the UE 10 connected to the network measurement terminal 59. An example of the predetermined communication standard is Ethernet.

[0065] (Network Measuring Instrument 50B) Next, the configuration of network measurement device 50B will be described with reference to Fig. 3. Fig. 3 shows a configuration assuming that network measurement device 50A is connected to UE 10, while network measurement device 50B is connected to server device 22 via network measurement terminal 59. In Fig. 3, parts that are the same as those in network measurement device 50A shown in Fig. 2 are denoted by the same reference numerals.

[0066] 3, network measurement device 50B is configured with the same functional blocks as network measurement device 50A, except that it has a time error estimation unit 63 as a component of control unit 57. However, in control unit 57 of network measurement device 50B, delay measurement control unit 62 is configured to control, when network measurement device 50B is connected to server device 22 and in operation, to perform measurement operations such as one-way delay measurement between server device 22 and network device 50A (see FIGS. 6(a) and 6(b)), in addition to one-way delay measurement operations for the one-way delay measurement section, based on the settings in setting control unit 60.

[0067] The time error estimation unit 63 calculates the time error T of the server device 22 based on the measurement results of the one-way delay measurement and round-trip delay measurement control between the server device 22 and the time error estimation unit 63, which are performed by the delay measurement control unit 62. err This is a functional unit that performs the process of estimating (see FIG. 6(c)).

[0068] In addition, in the network measurement device 50B, the delay measurement control unit 62 may store the measurement results of the above-mentioned one-way delay measurement, and the measurement results (measurement data) of the one-way delay measurement and round-trip delay measurement between the server device 22, for example, in a specified storage area of ​​the memory unit 56 so that they can be collected later from the outside (see Figures 7 and 8).

[0069] 2 and 3 are based on the assumption that network measurement devices 50A and 50B are connected to UE 10 and server device 22, respectively, and perform one-way delay measurements, with network measurement device 50B having time error estimation unit 63 and network measurement device 50A not having time error estimation unit 63. However, network measurement devices 50A and 50B may also be operated while connected to server device 22 and UE 10, respectively, and to accommodate such operations, both devices may have a configuration (similar configuration) that includes time error estimation unit 63.

[0070] Assuming that network measurement device 50A and network measurement device 50B have the same configuration, when one-way delay measurement is performed on a one-way delay measurement section of communication network 1, one of them is connected to one end of the one-way delay measurement section (the device that transmits the one-way delay measurement signal) and the other is connected to the other end of the one-way delay measurement section (the device that receives the one-way delay measurement signal). Here, network measurement device 50A and network measurement device 50B connected to one end and the other end may be interchanged. FIG. 1 illustrates an example in which, within communication network 1, network measurement device 50A is connected to UE 10, which is the sender of the one-way delay measurement signal, and network measurement device 50B is connected to server device 22, which is located in data center 30 and is the receiver of the one-way delay measurement signal.

[0071] In this case, the network measurement device 50A is installed within the communication network 1 so as to connect the UE 10 to the network measurement terminal 59 (see Figure 2), and the delay measurement control unit 62 drives and controls the UE 10 to transmit a one-way delay measurement signal to the server device 22, which is the other party.

[0072] In contrast, the network measurement device 50B is installed within the communication network 1 so that the transceiver unit 23 of the server device 22 is connected to the network measurement terminal 59 (see Figure 3), and the delay measurement control unit 62 captures the above-mentioned one-way delay measurement signal received by the transceiver unit 23 and performs one-way delay measurement between the UE 10 and the server device 22 based on that signal.

[0073] Contrary to the configuration shown in FIG. 1, it is also possible to arrange the network measurement device 50B in the communication network 1 so that it is connected to the UE 10 and the network measurement device 50A is connected to the server device 22. In this case, the network measurement device 50B controls the operation of the UE 10, and the network measurement device 50A accesses the transceiver unit 23 of the server device 22 to perform one-way delay measurements.

[0074] (Server device) FIG. 4 shows the connection between network measurement device 50B and server device 22 when network measurement devices 50A and 50B having the above-described configuration are arranged in communication network 1 in the manner shown in FIG. 1, for example, and the detailed configuration of server device 22.

[0075] As shown in FIG. 4, the server device 22 comprises a transmitting / receiving unit 23, a control unit 24, a storage unit 25, an operation unit 26, a display unit 27, and a clock 28.

[0076] The transceiver 23 has a signal transmitter 23a and a signal receiver 23b, and is connected to the base station 11 via the core network 21. In the transceiver 23, the signal transmitter 23a receives a signal intended for the UE 10 from the controller 24 and sends it to the core network 21, while the signal receiver 23b receives a signal from the UE 10 intended for the controller 24 from the core network 21 and inputs it to the controller 24.

[0077] In the server device 22, a network measurement device (e.g., 50B) is connected to the path between the signal transmitting unit 23a and the signal receiving unit 23b and the core network 21, and the above-mentioned one-way delay measurement or one-way and two-way delay measurement between the network measurement device 50B and the server device 22 is performed.

[0078] The control unit 24 comprehensively controls the operation of the entire server device 22. As an example of control, for example, when performing one-way delay measurement for the section between UE 10 and server device 22, the control unit 24 performs the one-way delay measurement while transmitting and receiving control signals and the like to and from the delay measurement control unit 62 of the network measurement device 50B connected to the above-mentioned path via the transceiver 23 (i.e., in cooperation with the delay measurement control unit 62). The control unit 24 also cooperates with the delay measurement control unit 62 of the network measurement device 50B to control the one-way and round-trip delay measurements between the server device 22 and the server device 22, as well as the time error estimation of the server device 22. Here, when performing the one-way delay measurement between UE 10 and server device 22, the one-way and round-trip delay measurements between the server device 22 and the server device 22, as well as the time error estimation of the server device 22, the control unit 24 may store the measurement results (measurement data) in a predetermined storage area of ​​the memory unit 25, for example, so that they can be collected later from an external source (see FIGS. 7 and 8 ).

[0079] The memory unit 25 stores various data such as a control program for causing the control unit 24 to perform one-way delay measurements in the one-way delay measurement section, one-way and round-trip delay measurements between the network measurement device 50B, measurement data for one-way delay measurements in the one-way delay measurement section, and measurement data for one-way and round-trip delay measurements between the network measurement device 50B.

[0080] The operation unit 26 is a functional unit for inputting various information such as commands, etc. The display unit 27 is composed of a liquid crystal panel or the like, and is a functional unit for displaying various information such as a screen related to control of one-way delay measurement, etc., and measurement results.

[0081] The clock 28 is a functional unit that generates highly accurate clock information (time information). The server device 22 does not have a control function for synchronizing the time information generated by the clock 28 with UTC.

[0082] Next, the one-way delay measurement operation for the one-way delay section of the communication network 1 by the network measurement system 5 according to this embodiment will be described with reference to the flowchart shown in FIG.

[0083] In the network measurement system 5 according to this embodiment, in order to perform one-way delay measurement on the communication network 1 (see FIG. 1), a one-way delay measurement section is determined, and network measurement device 50A is connected to the equipment on the transmitting side of the one-way delay measurement signal, and network measurement device 50B is connected to the equipment on the receiving side of the one-way delay measurement signal (step S1).

[0084] Here, if the one-way delay measurement section is, for example, between UE 10 and server device 22, as shown in Figure 1, network measurement device 50A is connected to UE 10 and network measurement device 50B is connected to server device 22 so that one-way delay measurement is possible.

[0085] Next, network measurement conditions (one-way delay measurement conditions) are set for network measurement device 50A and network measurement device 50B (step S2). This setting can be performed, for example, by the user operating a predetermined setting screen displayed on display operation unit 55. Examples of the network measurement conditions to be set include the one-way delay measurement section (device on one end and device on the other end), the measurement direction (upstream or downstream), the measurement period, etc.

[0086] Once the network measurement conditions have been set and preparations for starting measurement are complete, an operation to instruct the start of measurement is performed on the setting screen described above in network measuring device 50A (step S3).

[0087] Upon receiving the instruction to start measurement, the control unit 57 of the network measurement device 50A controls the delay measurement control unit 62 to drive the UE 10, which is the device on one end, to transmit a one-way delay measurement signal to the server device 22, which is the device on the other end, based on the setting in step S2 above, for example, when the measurement direction is uplink. At this time, the network measurement device 50A also controls the one-way delay measurement signal to include a timestamp indicating the transmission time of the signal (step S4). The timestamp included at this time is time information obtained by the GNSS receiver 52 in the network measurement device 50A by processing information received from the GPS (Global Positioning System) 40 via the GNSS antenna 45.

[0088] The one-way delay measurement signal sent from UE 10 in step S4 above is transmitted to server device 22 via a route corresponding to a preset one-way delay measurement section in communication network 1. Specifically, in the configuration of communication network 1 shown in Fig. 1, the one-way delay measurement signal sent from UE 10 is transmitted, for example, using Stream #2, via base station 11, core network 21, and a route passing through transceiver unit 23 in server device 22.

[0089] During the transmission of the one-way delay measurement signal via Stream #2 in step S4 above, the delay measurement control unit 62 in the transceiver unit 23 of the server device 22, more specifically, in the network measurement device 50B connected to the path immediately before the server device 22 (see Figure 4), captures the one-way delay measurement signal being transmitted via the transceiver unit 58 and the measurement module 54 (see Figure 3), and imports the captured signal (step S5).

[0090] Next, the delay measurement control unit 62 extracts the timestamp added to the one-way delay measurement signal that has been taken in, and compares the time information indicated by the timestamp with the time information that the GNSS receiver 52 on its own unit side has obtained by processing information received from the GPS 40 via the GNSS antenna 45, to calculate the one-way delay amount OWD between the UE 10 and the server device 22. up-raw The time is calculated as [ms] (step S6).

[0091] Subsequently, the delay measurement control unit 62 calculates the one-way delay OWD calculated in step S6. up-raw is stored in a predetermined storage area set in advance in the storage unit 56 (step S7).

[0092] In addition, the one-way delay amount OWD between the UE 10 and the server device 22 in the above steps S4 to S7 up-raw The measurements are continuously performed for the measurement period set in step S2 above, and when the measurement period ends, a series of one-way delay measurements for the uplink path between UE 10 and server device 22 ends.

[0093] In FIG. 5, the one-way delay amount OWD for the uplink path between the UE 10 and the server device 22 is up-raw The measurement operation of the one-way delay amount OWD in the downlink path was described above. However, for the same section, the server device 22 was set as one end side device and the UE 10 was set as the other end side device. down-rawThe measurement operation for Stream #1 can be performed in the same manner (see FIG. 5) using Stream #1. However, in this case, network measurement device 50B instructs server device 22 to send a one-way delay measurement signal, and network measurement device 50A controls UE 10 to receive (capture) the signal.

[0094] One-way delay (OWD) in the one-way delay measurement section shown in Fig. 5 up-raw , O.W.D. down-raw Regarding the measurement of one-way delay (OWD) in the one-way delay measurement section using network measuring devices 50A and 50B, since the server device 22 on one side is located within the data center 30 (see FIG. 1), the one-way delay (OWD) in the one-way delay measurement section is measured using network measuring devices 50A and 50B. up , O.W.D. down ) The measurement is performed in an environment that is affected by the time information obtained from the clock 28 of the server device 22.

[0095] In this regard, in the network measurement system 5 according to this embodiment, as will be described in detail later, a network measurement device on one side (for example, 50B) calculates the time error T of the server device 22 from the measurement results of one-way delay measurement and round-trip delay measurement between the server device 22 and the network measurement device 50B. err and correct the one-way delay (OWDup, OWDdown). This allows both network measurement devices 50A, 50B to operate in an environment equivalent to when they can obtain time information synchronized with UTC, even in an environment affected by the time information obtained from clock 28 of server device 22. Therefore, under conditions of high time accuracy, the time error of the device on one end can be estimated while measuring the one-way delay for the one-way delay measurement section, and accurate one-way delay can be measured taking into account the estimated time error.

[0096] (Time error estimation process of server device 22) Next, the time error T errHere, the estimation operation of the one-way delay (OWD) for the uplink path in the one-way delay measurement section between the UE 10 and the server device 22 will be described. up ) and the time error T err The estimation operation will be described below by taking the above as an example.

[0097] At this time, the time error T err The estimation of the delay time can be performed by the delay measurement control unit 62 of the network measurement device 50B (see Figure 3) connected to the transmitter / receiver unit 23 of the server device 22, which is the equipment at the other end of the one-way delay measurement section, exchanging signals with the control unit 24 of the server device 22.

[0098] As an example, in this embodiment, the delay measurement control unit 62 and the control unit 24 of the server device 22 cooperate to simultaneously perform one-way delay measurement using Stream #3 established between them and round-trip delay measurement using Stream #4 (see FIGS. 6(a) and 6(b)). From the results of the one-way delay measurement and the round-trip delay measurement, the time error T err An example is given in which the following is estimated (see Figure 6(c)).

[0099] The time error estimation process of server device 22 performed by delay measurement control unit 62 will be described with reference to Fig. 6. In network measurement device 50B, upon receiving a one-way delay measurement signal from UE 10, delay measurement control unit 62 executes, for example, the control sequences shown in Fig. 6(a) and Fig. 6(b) between network measurement device 50B and control unit 24 of server device 22.

[0100] Fig. 6(a) shows an example of a one-way delay measurement control sequence between the delay measurement control unit 62 and the server device 22. As shown in Fig. 6(a), one pattern of one-way delay measurement between the delay measurement control unit 62 and the server device 22 is one in which the delay measurement control unit 62 establishes Stream #3 with the server device 22 and instructs the server device 22 to send a delay measurement signal for measuring the time error using Stream #3.

[0101] Upon receiving the above instruction, the control unit 24 of the server device 22 transmits a delay measurement signal for measuring a time error, to which a time stamp has been added, to the network measuring device 50B using Stream #3.

[0102] When the network measuring device 50B receives the delay measurement signal from the control unit 24 of the server device 22, the delay measurement control unit 62 calculates the time corresponding to the difference between the reception time and the time information indicated by the time stamp added to the delay measurement signal as the downstream one-way delay amount OWD. te-down Furthermore, the delay measurement control section 62 performs a process of calculating the one-way delay amount OWD. te-down is stored in a predetermined storage area of ​​the storage unit 56, for example.

[0103] Here, the delay measurement control unit 62 and the control unit 24 of the server device 22 cooperate to measure the one-way delay amount OWD in the downlink direction. te-down Similarly, as shown by the dotted line in FIG. 6(a), the amount of one-way delay in the uplink direction, OWD, is calculated. te-up It is also possible to calculate the OWD in the time error estimation process of the server device 22, which will be described later. te-down , O.W.D. te-up Since it is sufficient to have one of these, in the following, OWD te-down shall be used.

[0104] 6(b) shows an example of a round-trip delay measurement control sequence between the delay measurement control unit 62 and server device 22. As shown in FIG. 6(b), in measuring the round-trip delay with server device 22, the delay measurement control unit 62 uses Stream #4 established with the control unit 24 of server device 22 to transmit a delay measurement signal for measuring a time error, to which a time stamp has been added, to the control unit 24 of server device 22. When the server device 22 receives the delay measurement signal, the control unit 24 returns the delay measurement signal and transmits it to the delay measurement control unit 62 of network measuring device 50B using Stream #4.

[0105] When the delay measurement control unit 62 receives the delay measurement signal returned from the server device 22, it calculates the time corresponding to the difference between the reception time and the time information indicated by the time stamp added to the delay measurement signal as a round trip delay amount TWD. te Furthermore, the delay measurement control section 62 performs a process of calculating the calculated round trip delay amount TWD te For example, the one-way delay amount OWD already stored in a predetermined storage area of ​​the storage unit 56 te-down (Or OWD te-up ) and store it.

[0106] Furthermore, in the network measuring instrument 50B, the time error estimating unit 63 calculates the one-way delay time OWD obtained by the control sequence shown in FIGS. 6(a) and 6(b). te-down (or OWD te-up ), and round trip delay time TWD te Based on this, the time error T err is estimated (see Figure 6(c)). T err =TWD te / 2-OWD te-down ... (1) OWD down =OWD down-raw +T err ... (2) OWD up =OWD up-raw -T err ... (3)

[0107] The following can be understood from the above formula (1). The time error T err is the round trip delay TWD between the network measuring instrument 50B and the te From half the value of te-down ) minus the value.

[0108] On the other hand, the OWD we sought earlier down-raw , O.W.D.up-raw The following can be understood from the above equations (2) and (3) using (see Figure 1). The exact amount of downlink one-way delay OWD between the UE 10 and the server device 22 (in a state synchronized with UTC) down is the downlink one-way delay (actual measurement value) OWD down-raw The time error T of the server device 22 calculated by the above equation (1) is err The accurate uplink one-way delay amount OWD between the UE 10 and the server device 22 (in a state synchronized with UTC) can be considered as the sum of the values. up is the uplink one-way delay (actual measurement value) OWD up-raw The time error T of the server device 22 calculated by the above equation (1) is err can be thought of as the value obtained by subtracting

[0109] From these points, the time error T of the server device 22, which can be expressed by the above formula (1), err If this is known, the upstream one-way delay amount OWD can be calculated using the above equations (2) and (3). up , and downstream one-way delay OWD down Time error T err It can be seen that it is possible to correct to the accurate value when there is no

[0110] Here, the uplink one-way delay amount OWD up-raw The data is stored in the storage unit 56 of the network measuring instrument 50A, for example, and is represented as the downstream one-way delay amount OWD. down-raw and the time error T err This data is stored in a predetermined storage area of ​​memory unit 56 of network measuring device 50B, for example, during execution of the above-described control sequence (see FIG. 6).

[0111] As a result, in the network measurement system 5 according to this embodiment, the upstream one-way delay amount OWD in the one-way delay measurement section of the communication network 1 stored in each of the storage areas is up-raw , Downstream one-way delay OWD down-raw , and the time error T errThe data is read out, and the uplink one-way delay amount OWD is calculated using the above equations (1), (2), and (3). up-raw , and downstream one-way delay OWD down-raw By performing the correction process, the time error T err Correct uplink one-way delay (OWD) up , and downstream one-way delay OWD down Next, a one-way delay correction function provided in the network measurement system 5 according to this embodiment will be described.

[0112] (One-way delay compensation function) The network measurement system 5 according to this embodiment converts the one-way delay values ​​measured by the network measurement devices 50A and 50B into one-way and round-trip delay values ​​between the server device 22 and the network measurement device 50B, and the time error T err It has a processing function to correct based on the value of

[0113] The process of correcting the measured one-way delay value involves measuring one-way delays by two network measurement devices 50A and 50B, measuring one-way and round-trip delays between the network measurement device 50A and the server device 22 by the other network measurement device 50B, and correcting the time error T err After the estimation is completed and each measurement data is stored, the measurement data is collected and analyzed.

[0114] Therefore, network measurement system 5 according to this embodiment has a configuration in which a data analysis processing device that collects measurement data from network measurement devices 50A and 50B and analyzes the data is arranged outside of network measurement devices 50A and 50B. The arrangement of the data analysis processing device to achieve this configuration will be described with reference to Figures 7 and 8.

[0115] (First arrangement) FIG. 7 shows a first arrangement of a data analysis processing device equipped with a one-way delay correction function in a network measurement system 5 according to this embodiment.

[0116] In the first arrangement, the data analysis processing device 70 is realized by, for example, an information processing device such as a PC having a communication function and an information processing function. In the example shown in Fig. 7, the data analysis processing device 70 is communicably connected to each of the network measurement devices 50A, 50B and the server device 22. The data analysis processing device 70 performs the above-mentioned one-way delay measurement between the UE 10 and the server device 22, one-way and round-trip delay measurement between the UE 10 and the server device 22, and time error T err The network measuring device 50A has a data collection unit 71 that accesses the data storage areas of the network measuring devices 50A and 50B at a predetermined timing after the estimation is completed, and collects and analyzes the measurement data stored in the data storage areas of the devices. The data collection unit 71 constitutes the collection means of the present invention.

[0117] Specifically, as shown in FIG. 7, the data collection unit 71 accesses the storage unit 56 of the network measurement device 50A and retrieves the one-way delay data Da (=ODW) of the downlink direction between the UE 10 and the server device 22 from the data storage area. down_raw ) to collect.

[0118] Furthermore, the data collection unit 71 accesses the storage unit 56 of the network measurement device 50B and extracts from the data storage area thereof one-way delay data Db (=ODW) in the uplink direction between the UE 10 and the server device 22. up_raw Furthermore, the data collection unit 71 collects one-way delay data Dc (=OWD) between the server device 22 and the storage unit 56 of the network measuring device 50B. te-down (Or OWD te-up ), round trip delay data Dd (= TWD te ), and the time error data De(=T err ) and also performs the process of collecting each data Dc, Dd, and De.

[0119] In the network measurement system 5 according to this embodiment, the one-way delay data Dc (=OWD) between the server device 22 and the network te-down (Or OWD te-up ), round trip delay data Dd (= TWD te ), the time error data De(T err ) can be configured so that the server device 22 stores the one-way delay data Dc (=OWD) between the server device 22 and the data analysis processing device 70 in its storage unit 25 (see FIG. 4). In this case, as shown in FIG. 7 where the measurement data (Dc, Dd, De) in parentheses are shown between the server device 22 and the data analysis processing device 70, the data collection unit 71 accesses the storage unit 25 of the server device 22 and collects the one-way delay data Dc (=OWD) between the server device 22 and the data analysis processing device 70, which is stored in the data storage area. te-down (Or OWD te-up ), round trip delay data Dd (= TWD te ), time error data De(=T err ) can be collected.

[0120] After collecting each measurement data from the network measurement devices 50A and 50B (or the server device 22) as described above, the data analysis processing device 70 uses the collected measurement data to derive one-way delay measurement data (=ODW) for the one-way delay measurement section (between the UE 10 and the server device 22) on the communication network 1. down_raw , O.D.W. up_raw ) is corrected.

[0121] To achieve this, the data analysis processing device 70 has a one-way delay correction unit 72. The one-way delay correction unit 72 executes a process of correcting the one-way delay data Da, Db collected from the network measurement devices 50A, 50B using the one-way delay data Dc, round-trip delay data Dd, and time error data De of the server device 22 collected from the network measurement device 50B (or the server device 22). The one-way delay correction unit 72 constitutes the one-way delay correction means of the present invention.

[0122] Here, the time error data De(=T err ) was calculated using the above formula (1) (T err =TWD te / 2-OWD te-down ) is collected from the network measuring instrument 50A. down_raw ) correction value (OWD down ) is the time error data De(=T err ), the following values ​​can be derived from the above equation (2): OWD down =OWD down-raw +T err

[0123] On the other hand, the upstream one-way delay data Db (=OWD) collected from the network measuring instrument 50B up_raw ) correction value (OWD up ), the one-way delay correction unit 72 calculates the time error data De(=T err ) values, the following values ​​can be derived from the above equation (2). OWD up =OWD up-raw -T err

[0124] The one-way delay correction process by the one-way delay correction unit 72 described above is performed by one of the network measurement devices (e.g., 50B) connected to the server device 22 using inaccurate time information obtained from the clock 28 (see FIG. 4) of the server device 22, resulting in one-way delay data (OWD) containing a time error. up-raw , O.W.D. down-raw ) can be obtained by synchronizing the network measurement devices 50A and 50B with UTC obtained from the GPS 40 and measuring one-way delays at both ends. err Accurate One-Way Delay Data (OWD)up , O.W.D. down ) can be acquired. With this one-way delay correction function, the network measurement system 5 according to this embodiment can more accurately measure the one-way delay between the server device 22 and the UE 10 as the one-way delay measurement section, even in a situation where one side of the one-way delay measurement section of the communication network 1 is located, for example, in a data center 30, making it difficult to perform one-way delay measurements synchronized with UTC on both sides.

[0125] (Second arrangement) FIG. 8 shows a second arrangement of the data analysis processing device equipped with a one-way delay measurement value correction function in the network measurement system 5 according to this embodiment.

[0126] In the second arrangement, the server device 22 is provided with a data analysis processing device 70 having functions corresponding to those of the data analysis processing device 70 in the first arrangement. The data analysis processing device 70A is communicably connected to each of the network measurement devices 50A and 50B. Like the data analysis processing device 70 described in the first arrangement, the data analysis processing device 70A measures one-way delay between the UE 10 and the server device 22, one-way and round-trip delays between the UE 10 and the server device 22, and calculates the time error T err It has the function of accessing the data storage areas of each of the network measuring instruments 50A and 50B at a predetermined timing after the estimation is completed and collecting the measurement data stored in the data storage areas of each part (a data collection function unit equivalent to the data collection unit 71).

[0127] Specifically, as shown in FIG. 8, the data collection function unit collects one-way delay data Da (=ODW) in the downlink direction between the UE 10 and the server device 22 from the data storage area of ​​the network measuring device 50A. down_raw ) to collect.

[0128] The data collection function unit also collects one-way delay data Db (=ODW) in the uplink direction between the UE 10 and the server device 22 from the data storage area of ​​the network measuring device 50B. up_raw ) and also collects one-way delay data Dc (=OWD) between the server device 22. te-down (Or OWD te-up ), round trip delay data Dd (= TWD te ), and the time error data De(=T err ) to collect.

[0129] Here, the server device 22 also receives one-way delay data Dc (=OWD) from the network measuring instrument 50B. te-down (Or OWD te-up ), round trip delay data Dd (= TWD te ), and the time error data De(=T err ), it is also possible to configure the data analysis processing device 70A to store these data Dc, Dd, De in, for example, the storage unit 25 of its own device (see FIG. 4). In this case, the data collection function unit of the data analysis processing device 70A accesses the storage unit 25 of the server device 22 and collects the one-way delay data Dc (=OWD) between the server device 22 and the data analysis processing device 70A, as shown in FIG. 8, in which the measurement data (Dc, Dd, De) in parentheses is associated with the server device 22. te-down (Or OWD te-up ), round trip delay data Dd (= TWD te ), time error data De(=T err ) can be collected.

[0130] After collecting each measurement data from the network measurement devices 50A and 50B (or the server device 22), the data analysis processing device 70A uses the collected measurement data to compile one-way delay measurement data (=ODW) for the one-way delay measurement section (between the UE 10 and the server device 22) on the communication network 1. down_raw , O.D.W. up_raw ) is corrected.

[0131] To perform this processing, the data analysis processing device 70A has a one-way delay correction function unit equivalent to the one-way delay correction unit 72 of the data analysis processing device 70 described in the first arrangement. As a result, in the data analysis processing device 70A, the one-way delay correction function unit calculates the time error data De (=T err =TWD te / 2-OWD te-down ) and the downstream one-way delay data Da (=OWD) collected from the network measuring instrument 50A using the above equations (2) and (3). down_raw ) correction value (OWD down ), and upstream one-way delay data Db (=OWD) collected from network measuring instrument 50B. up_raw ) correction value (OWD up ) are calculated as follows, respectively: OWD down =OWD down-raw +T err OWD up =OWD up-raw -T err

[0132] In the one-way delay correction processing by the one-way delay measurement correction function unit of the data analysis processing device 70A of the server device 22 described above, similar to the one-way delay correction processing by the one-way delay correction unit 72 of the data analysis processing device 70 relating to the first arrangement form, by arranging one side of the one-way delay measurement section of the communication network 1, for example, within a data center 30, it becomes possible to more accurately measure the one-way delay in the one-way delay measurement section between the server device 22 and the UE 10, even in a situation where it is difficult for both sides to perform one-way delay measurements synchronized with UTC.

[0133] The one-way delay amount OWD mentioned above up , O.W.D. down The correction process is performed by using the downstream one-way delay data Da (=OWD) stored in the network measuring instrument 50A. down_raw ), the upstream one-way delay data Db (=OWD) stored in the network measuring instrument 50B up_raw), the time error T err As long as it has a function to access the storage area storing the value of the parameter, the access may be performed by any other module other than the PC (see FIG. 7) or the server device 22 (see FIG. 8).

[0134] Next, the one-way delay and the time error T err The estimation results will be explained using specific examples.

[0135] Figure 9 is an image diagram showing the structure of data transmission paths and transmission data corresponding to the one-way delay measurement section of communication network 1 shown in Figure 1. As shown in Figure 9, the one-way delay measurement section of communication network 1 shown in Figure 1 is configured as a RAN (Radio Access Network) 12 that accommodates UE 10 such as a smartphone or PC in the wireless communication area of ​​base station (NB) 11, and the RAN 12 is assumed to be communicably connected to data center 30 by a dedicated line, for example, a virtual private network (VPN) 13 (corresponding to access network 15 in Figure 1).

[0136] In the assumed data transmission path, one-way delay and time error T err When estimating the above, one of the two network measurement devices 50A, 50B constituting the network measurement system 5 of this embodiment (network measurement device 50A) is connected to the UE 10, and the other (network measurement device 50B) is connected to the server device 22 in the data center 30.

[0137] In Figure 9, the data to be measured for one-way latency in the network measurement system 5 of this embodiment is Latency measurement raw data that is sent from the network measurement device 50A and transmitted through the RAN 12 and virtual private network 13 to the server device 22 in the data center 30, as disclosed in the lower part (middle part) of Figure 9 in association with the above-mentioned data transmission path (upper part) of Figure 9.

[0138] The latency measurement raw data includes delays that occur between the network measuring device 50A and the entrance of the server device 22 in the data center 30 (Data Center-UE Target delay) and a time error T err Contains:

[0139] In the communication environment shown in FIG. 9, the network measurement system 5 according to this embodiment is used to measure one-way delay between the Data Center and the UE (see FIG. 5), and the time error T err When the estimation (see Figure 6) was performed, the measurement results shown in the table in Figure 10 were obtained.

[0140] 10, Time indicates the measurement time. In this example, measurements were taken at 10:00, 10:01, 10:02, and 10:03.

[0141] Raw Latency indicates the latency time (Latency measurement raw data) shown in the middle of Figure 9, and is expressed in milliseconds (ms).

[0142] The correction for time error is the time error T err The value is expressed in milliseconds [ms].

[0143] Data Center-UE Latency is shown in the bottom left of Figure 9 (time error T err The one-way delay between the data center and the UE is shown in the figure (adjacent to the figure), and is measured in milliseconds (ms).

[0144] As can be seen from the table shown in FIG. 10, the one-way delay time of the data (Latency measurement raw data) transmitted through the one-way delay measurement section shown in FIG. 9 is the time error T err The value is measured as the sum of the value of the one-way delay time between the data center and the UE.

[0145] According to the table shown in Figure 10, when one-way delay and time error estimation was performed for the data center-UE connection shown in Figure 9, the one-way delays measured at 10:00, 10:01, 10:02, and 10:03 were 55.456 [ms], 56.751 [ms], 77.373 [ms], and 77.373 [ms], respectively.

[0146] More specifically, the breakdown of the one-way delay of 55.456 [ms] measured at 10:00 is as follows: err The one-way delay between the data center and the UE was 45.345 ms, while the value of 10.111 ms was 10.111 ms.

[0147] The breakdown of the one-way delay of 56.751 [ms] measured at 10:01 is as follows: err The one-way delay between the data center and the UE was 46.453 ms, while the value of the

[0148] The breakdown of the one-way delay of 77.373 [ms] measured at 10:02 is as follows: err The value of the one-way delay between the data center and the UE was 10.486 [ms], and the one-way delay between the data center and the UE was 66.887 [ms]. Furthermore, the breakdown of the one-way delay of 55.365 [ms] measured at 10:03 was the time error T errThe value was 10.600 [ms], and the one-way delay time between the data center and the UE was 44.765 [ms].

[0149] The one-way delay measurement results and time error estimation results shown in the table of Figure 10 are graphed in Figure 11. In this graph, the horizontal axis indicates the measurement time (unit: hour; minute) and the vertical axis indicates the one-way delay amount. The one-way delay on the vertical axis is the value of Data Center-UE Latency and the time error T err The values ​​are represented by a single distinct bar.

[0150] According to the graph of one-way delay measurement results and time error estimation results shown in Figure 11, the shape of each bar (Data Center-UE Latency value + time error T err As shown in the figure, the Data Center-UE Latency value is calculated by subtracting the time error T from the total one-way delay value. err It can be understood that the value can be corrected to an accurate value by subtracting the value of

[0151] (One-way delay compensation function applied) As disclosed and described in FIGS. 7 and 8, the network measurement devices 50A and 50B constituting the network measurement system 5 according to this embodiment each generate downstream one-way delay data Da (=OWD) according to the flowchart shown in FIG. down_raw ), Upstream one-way delay data Db (=OWD up_raw ) and stores the measured data Da and Db. In addition, the network measuring instrument 50B (or the server device 22) measures the time error T err Furthermore, in the network measurement system 5 according to this embodiment, a data analysis processing device 70 (see FIG. 7) or a data analysis processing device 70A (see FIG. 8) is disposed outside the network measurement devices 50A and 50B, and these devices collect and analyze the measurement data stored as described above, thereby estimating and storing the time error T errThis makes it possible to measure accurate one-way delay (see equations (2) and (3) above) that is not affected by the above.

[0152] (Countermeasures for fluctuations in one-way delay measurement results) The one-way delay measurement results and time error estimation results shown in the table in Figure 10 show that delays can increase or decrease. Furthermore, from these measurement results, it is quite possible to imagine that the delay can suddenly fluctuate significantly.

[0153] To improve the accuracy of one-way delay measurement, it is preferable to minimize the aforementioned temporal fluctuations in delay or sudden, sudden fluctuations in delay. One possible solution to this problem is, for example, calculating the average value of one-way delay measurements over a predetermined period and using this average value as the measurement value (one-way delay measurement result). Alternatively, if sudden fluctuations are expected, a method can be considered in which a threshold value (such as the average value described above) is set in advance, and any measured delay exceeding this threshold value is excluded from the measurement value (i.e., the measurement value is not output). Either method can eliminate factors that cause sudden changes, thereby stabilizing one-way delay measurement.

[0154] In the above embodiment, an example of a configuration in which communication between UE 10 and base station (NB) 11 is possible via a wireless line is given as the communication network 1 that is subject to one-way delay, but this is not limited to this, and the configuration may also be such that UE 10 and base station (NB) 11 are connected via a wired line.

[0155] In addition, in the above embodiment, a measurement method when the one-way delay time is positive was exemplified, but the one-way delay measurement method of the present invention can also be applied when the one-way delay time is negative (when there is no delay and time is actually advancing). When the delay time is negative (when time is advancing), it can be handled by performing the opposite calculation to when there is a delay time.

[0156] The foregoing has described one embodiment of the network measurement system 5 according to the present invention (see FIGS. 2 to 11) on the assumption that the communication network 1 has the configuration shown in Fig. 1. This embodiment is merely an example, and the network measurement system 5 according to the present invention can handle the various measurement operations described above even if the communication network 1 has a configuration different from that shown in Fig. 1 (or even if it is a normal network other than 5G).

[0157] Fig. 12 shows an example of the configuration of another communication network 1A that can be measured by the network measurement system 5 according to the present invention. In Fig. 12, the same components as those shown in Fig. 1 are assigned the same reference numerals. As shown in Fig. 12, this communication network 1A differs from the communication network 1 (see Fig. 1) shown in Fig. 1 in that the core network 21 and the server device 22 are provided in separate data centers 31 and 30, respectively.

[0158] 1 and 12, in a communication network that can be handled by the network measurement system 5 according to this embodiment, the core network 21 and the server device 22 do not necessarily have to be provided in the same data center 30 as shown in FIG. 1, but may be provided in separate data centers 31, 30, as shown in FIG. 12. It is also possible that the core network 21 is not located in the data center 31. The network measurement system 5 according to this embodiment can handle measurements similar to those for a core network 21 having the arrangement of the parts shown in FIG. 12, even when the core network 21 has the arrangement of the parts shown in FIG. 12.

[0159] As described above, the network measurement system 5 according to this embodiment measures one-way delay between the edge connecting the server device 22 connected to the network and the terminal (UE 10, PC, etc.).

[0160] The network measurement system 5 according to this embodiment includes an acquisition unit that allows the server device 22 and the terminal to acquire time information as a common clock. For example, the network measurement system 5 is connected to the UE 10 or is located outside the data center 30 and connected to the server device 22. In an environment affected by time information obtained from the clock 28 of the server device 22, the network measurement system 5 measures the one-way delay (OWD) in a one-way delay measurement section between the UE 10 and the server device 22. up , O.W.D. down The first network measurement device 50A and the second network measurement device 50B measure one-way delay and round-trip delay in parallel with one-way delay measurement in the one-way delay measurement section while connected to the server device 22, based on a delay measurement signal for measuring time error between the server device 22 and the first network measurement device 50A and the second network measurement device 50B. The first network measurement device 50A and the second network measurement device 50B measure one-way delay and round-trip delay in parallel with one-way delay measurement in the one-way delay measurement section while connected to the server device 22. The delay measurement control unit 62 measures the one-way delay and round-trip delay (OWD) in parallel with one-way delay measurement in the one-way delay measurement section while connected to the server device 22. te-down , O.W.D. te-up , and TWD te ) based on the time error (T err and a time error estimation means (63) for estimating the time error (

[0161] With this configuration, even in an environment where it is difficult for one end of the one-way delay measurement section (for example, the server device 22 side) to obtain time information from a common clock, the network measurement system 5 according to this embodiment can operate in an environment equivalent to when both network measurement devices 50A, 50B can obtain time information from a common clock by correcting the amount of one-way delay due to the time error of the clock in server device 22. This makes it possible to estimate the time error of the device on one end while performing one-way delay measurements on the one-way delay measurement section under conditions of high time accuracy, and to accurately measure one-way delay taking into account the time error estimation results.

[0162] In the network measurement system 5 according to this embodiment, the common clock is Coordinated Universal Time (UTC), and the acquisition means is a GNSS receiver 52. This configuration enables the network measurement system 5 according to this embodiment to operate in an environment equivalent to when both network measurement devices 50A, 50B can acquire time information synchronized with UTC, enabling accurate measurement of one-way delay under conditions of high time accuracy, taking into account the estimated time error of the device on one end of the one-way delay measurement section.

[0163] In addition, the network measurement system 5 of this embodiment targets a communication network 1 having, as the above-mentioned network, a core network 21 of a predetermined communication method, a server device 22 connected to the core network 21 and located in a data center 30, and an access network 15 for, for example, UE 10 to access the core network 21, and is configured to measure the one-way delay related to data transmission between UE 10 and server device 22.

[0164] With this configuration, the network measurement system 5 of this embodiment can accurately measure the one-way delay between the server device 22 in the data center 30 and a terminal at the edge of the network (UE 10, or PC, etc.) via the communication network 1.

[0165] In addition, in the network measurement system 5 according to this embodiment, the access network 15 has, for example, a base station 11 that accommodates the UE 10 so that it can communicate with the access network 15, and the base station 11 and the UE 10 are connected by wire or wirelessly.

[0166] With this configuration, the network measurement system 5 of this embodiment can measure the one-way delay between the UE 10 and the server device 22 in the communication network 1 using the same procedure, regardless of whether the base station 11 and, for example, the UE 10 are connected via a wired or wireless connection within the access network 15.

[0167] In addition, in the network measurement system 5 according to this embodiment, the core network 21 is configured by any one of private 5G, local 5G, and a 5G core network.

[0168] With this configuration, the network measurement system 5 of this embodiment can perform more accurate one-way delay measurements for a communication network 1 including core networks such as private 5G, local 5G, and 5G core networks.

[0169] Furthermore, in the network measurement system 5 according to this embodiment, the first network measurement device 50A and the second network measurement device 50B have a transceiver unit 58 that conforms to a predetermined communication standard, and are configured to be connected to, for example, a UE 10 or a server device 22 via the communication network 1.

[0170] With this configuration, the network measurement system 5 of this embodiment can easily construct a system configuration for measuring one-way delay between UE 10 and server device 22, and one-way and round-trip delay between UE 10 and server device 22.

[0171] In addition, in the network measurement system 5 according to this embodiment, the delay measurement control unit 62 is configured to perform one-way delay measurements in the one-way delay measurement section for a predetermined period at predetermined time intervals, and to output the average one-way delay measurement value for the above period as the one-way delay measurement result.

[0172] With this configuration, the network measurement system 5 of this embodiment can reduce the effect of extreme variations in the one-way measurement values ​​targeting the one-way delay measurement section, and eliminate uncertainty in the one-way delay of the communication network 1.

[0173] Furthermore, in the network measurement system 5 according to this embodiment, the delay measurement control unit 62 is configured to perform control so as not to output the one-way delay measurement result when the average value exceeds a preset threshold value.

[0174] With this configuration, the network measurement system 5 according to this embodiment can prevent the one-way delay measurement result from fluctuating beyond a preset threshold, and can perform one-way delay measurement with high accuracy while minimizing the time error T err The influence on the estimation results can also be reduced.

[0175] The network measurement system 5 according to this embodiment further includes data analysis processing devices 70 and 70A that are arranged to be able to communicate with the first network measurement device 50A and the second network measurement device 50B. The data analysis processing devices 70 and 70A analyze the downlink one-way delay (OWD) measurement results from the first network measurement device 50A to, for example, the UE 10. down ), and the result of measuring one-way uplink delay (OWD) from the UE 10 to the server device 22 by the second network measuring device 50B. up ), and the time error estimation result (TWD te ), and a one-way delay correction unit 72 that analyzes the downstream one-way delay measurement results, upstream one-way delay measurement results, and time error estimation results of the server device 22 collected by the data collection unit 71, and corrects the downstream one-way delay measurement results and upstream one-way delay measurement results based on the time error estimation results of the server device 22.

[0176] With this configuration, the network measurement system 5 of this embodiment can have the one-way delay correction unit 72 of the data analysis processing device 70, 70A analyze the downlink one-way delay measurement results, the uplink one-way delay measurement results, and the time error estimation results of the server device 22 collected by the data collection unit 71, and then easily correct the downlink one-way delay measurement results and the uplink one-way delay measurement results based on the time error estimation results of the server device 22, thereby achieving more accurate one-way delay measurements.

[0177] Furthermore, in the network measurement system 5 according to this embodiment, the data analysis processing device 70A is provided in the server device 22 that constitutes the communication network 1. With this configuration, the network measurement system 5 according to this embodiment can achieve a simple and inexpensive system configuration for achieving accurate one-way delay measurement.

[0178] Furthermore, in the network measurement system 5 according to this embodiment, the data analysis processing device 70 is configured to be placed outside the communication network 1 so as to be able to communicate with the first network measurement device 50A and the second network measurement device 50B.

[0179] With this configuration, the network measurement system 5 of this embodiment can place the data analysis processing device 70 at any location away from the first network measurement device 50A and the second network measurement device 50B, thereby improving flexibility in building a system to achieve accurate one-way delay measurements.

[0180] Furthermore, the network measurement method according to this embodiment is a network measurement method that uses the network measurement system 5 having the above-described configuration to measure one-way delay between an edge connecting a terminal (UE 10, PC, etc.) and a server device 22 connected to a communication network 1, and includes a connection step (S1) of connecting a first network measurement device 50A to, for example, UE 10 and a second network measurement device 50B installed outside the data center 30 and connecting them to the server device 22; and a connection step (S2) of measuring the one-way delay (OWD) in a one-way delay measurement section between the first network measurement device 50A and the second network measurement device 50B in an environment affected by time information obtained from the clock 28 of the server device 22. up , O.W.D. downa delay measurement control step (S11, S12) in which the second network measurement device 50B measures one-way delay based on a delay measurement signal for measuring time error and round-trip delay in parallel between the second network measurement device 50B and the server device 22 in accordance with the one-way delay measurement in the one-way delay measurement section; and a delay measurement control step (S11, S12) in which the second network measurement device 50B measures one-way delay and round-trip delay in parallel based on a delay measurement signal for measuring time error between the second network measurement device 50B and the server device 22 in accordance with the one-way delay measurement in the one-way delay measurement section. te-down , O.W.D. te-up , and TWD te ) based on the time error (T err and a time error estimation step (S13) of estimating the time error (.times. ...

[0181] With this configuration, the network measurement method according to this embodiment allows operation in an environment equivalent to when both network measurement devices 50A, 50B can obtain time information from a common clock, even in an environment where it is difficult for one end of the one-way delay measurement section (for example, server device 22) to obtain time information from a common clock, by correcting the amount of one-way delay due to the time error of clock 28 of server device 22. This makes it possible to estimate the time error of the device on one end while performing one-way delay measurements on the one-way delay measurement section under conditions of high time accuracy, and to accurately measure one-way delay taking into account the time error estimation result. [Industrial Applicability]

[0182] As described above, the present invention has the effect of enabling accurate measurement of the one-way delay of a one-way delay measurement section of a communication network, even in an environment where it is difficult to obtain time information synchronized with UTC, by using equipment at one end of the one-way delay measurement section as a common clock. This is useful for network measurement systems and network measurement methods in general that operate by placing two network measurement devices, one at one end and the other at the one-way delay measurement section. [Explanation of symbols]

[0183] 1. 1A communication network 5. Network Measurement Systems 10 User Equipment (UE) (Terminal) 11 Base station (NodeB) 12 RAN (Radio Access Network) 13 Virtual Private Network (VPN) 15 Access Network 21 Core Network 22 Server equipment 23, 58 Transmitter / receiver 23a Signal transmitter 23b Signal receiving unit 24, 57 Control section 25, 56 Memory section 26 Control section 27 Display section 28 Clock 30, 31 Data Center 40 GPS (Global Positioning System) 45 GNSS antenna 50A Network Meter (First Network Meter) 50B Network Measuring Instrument (Second Network Measuring Instrument) 52 GNSS receiver (acquisition method) 53 Signal Processing Device 54 Measurement Module 55 Display operation section 60 Setting control section 61 Positioning control unit 62 Delay measurement control unit (delay measurement control means) 63 Time error estimation unit (time error estimation means) 64 Display control unit 70, 70A Data analysis processing device 71 Data Collection Department (Means of Collection) 72 One-way delay correction unit (one-way delay correction means)

Claims

1. A network measurement system for measuring one-way delay between an edge connecting a server device (22) connected to a network and a terminal (10), comprising: The server device and the terminal each have an acquisition means (52) for acquiring time information as a common clock, and the system includes a first network measurement device (50A) and a second network measurement device (50B) that are connected to the terminal or are placed outside a data center and connected to the server device, and measure one-way delays (OWDup, OWDdown) in a one-way delay measurement section between the terminal and the server device in an environment affected by time information acquired from a clock (28) of the server device; The first network measurement device and the second network measurement device a delay measurement control means (62) for performing one-way delay measurement based on a delay measurement signal for measuring time error and round-trip delay measurement in parallel with the one-way delay measurement in the one-way delay measurement section while connected to the server device; a time error estimation means (63) for estimating a time error (Terr) of the server device, which reflects a time error between the time information of the common clock acquired by the acquisition means and the time information obtained from the clock, based on the measurement results (OWDte-down, OWDte-up, and TWDte) of the one-way delay measurement and the round-trip delay measurement by the delay measurement control means; and The delay measurement control means performs one-way delay measurement in the one-way delay measurement section for a predetermined period at predetermined time intervals, and outputting an average value of the one-way delay measurement value for the period as the one-way delay measurement result; The network measurement system is characterized in that the delay measurement control means controls so as not to output the one-way delay measurement result when the average value exceeds a preset threshold value.

2. 2. The network measurement system of claim 1, wherein the common clock is Coordinated Universal Time (UTC).

3. The network measurement system of claim 1 or 2 is characterized in that the network is a communication network (1) having a core network of a predetermined communication method, the server device being connected to the core network and being located in a data center (30), and an access network through which the terminal accesses the core network, and the one-way delay related to data transmission between the terminal and the server device is measured.

4. The access network has a base station (11) that accommodates the terminal so that the terminal can communicate with the base station, 4. The network measurement system according to claim 3, wherein the base station and the terminal are connected by wire or wirelessly.

5. The network measurement system of claim 3, wherein the core network is configured by any one of a private 5G, a local 5G, and a 5G core network.

6. 4. The network measurement system according to claim 3, wherein the first network measurement device and the second network measurement device have a transceiver (58) that conforms to a predetermined communication standard, and are connected to the terminal or the server device via the communication network.

7. A network measurement system for measuring one-way delay between an edge connecting a server device (22) connected to a network and a terminal (10), comprising: The server device and the terminal each have an acquisition means (52) for acquiring time information as a common clock, and the system includes a first network measurement device (50A) and a second network measurement device (50B) that are connected to the terminal or are placed outside a data center and connected to the server device, and measure one-way delays (OWDup, OWDdown) in a one-way delay measurement section between the terminal and the server device in an environment affected by time information acquired from a clock (28) of the server device; The first network measurement device and the second network measurement device a delay measurement control means (62) for performing one-way delay measurement based on a delay measurement signal for measuring time error and round-trip delay measurement in parallel with the one-way delay measurement in the one-way delay measurement section while connected to the server device; a time error estimation means (63) for estimating a time error (Terr) of the server device, which reflects a time error between the time information of the common clock acquired by the acquisition means and the time information obtained from the clock, based on the measurement results (OWDte-down, OWDte-up, and TWDte) of the one-way delay measurement and the round-trip delay measurement by the delay measurement control means; and further comprising a data analysis processing device (70, 70A) arranged to be able to communicate with the first network measurement device and the second network measurement device; The data analysis processing device includes: a collection means (71) for collecting a downstream one-way delay measurement result (OWDdown) from the server device to the terminal by the first network measurement device, an upstream one-way delay measurement result (OWDup) from the terminal to the server device by the second network measurement device, and a round trip delay measurement result (TWDte) of the server device; and one-way delay correction means (72) for analyzing the downstream one-way delay measurement results, the upstream one-way delay measurement results, and the time error estimation results of the server device collected by the collection means, and correcting the downstream one-way delay measurement results and the upstream one-way delay measurement results based on the time error estimation results of the server device.

8. The network measurement system of claim 7, wherein the common clock is Coordinated Universal Time (UTC).

9. The network is a communication network (1) having a core network of a predetermined communication method, the server device is connected to the core network, and the access network is located in a data center (30) and enables the terminal to access the core network, and the one-way delay related to data transmission between the terminal and the server device is measured; 9. The network measurement system according to claim 7, wherein the data analysis processing device (70A) is provided in the server device that constitutes the communication network.

10. The network is a communication network (1) having a core network of a predetermined communication method, and the server device is connected to the core network and is arranged in a data center (30), and an access network for the terminal to access the core network is targeted, and one-way delays related to data transmission between the terminal and the server device are measured; 9. The network measurement system according to claim 7, wherein the data analysis processing device (70) is arranged outside the communication network so as to be able to communicate with the first network measurement device and the second network measurement device.

11. A network measurement method for measuring one-way delay between an edge connecting the server device connected to the network and the terminal using the network measurement system according to claim 1, comprising: a connecting step (S1) of connecting the first network measurement device to the terminal and installing the second network measurement device outside the data center and connecting it to the server device; a one-way delay measurement step (S4-S6) in which the first network measurement device and the second network measurement device measure one-way delays (OWDup, OWDdown) in the one-way delay measurement section in an environment affected by time information obtained from the clock (28) of the server device; a delay measurement control step (S11, S12) in which the second network measurement device performs one-way delay measurement based on a delay measurement signal for measuring time error and round-trip delay measurement in parallel between the second network measurement device and the server device in accordance with the one-way delay measurement in the one-way delay measurement section; a time error estimation step (S13) of estimating a time error (Terr) of the server device, which reflects a time error between the time information of the common clock acquired by the acquisition means and the time information obtained from the clock, based on the measurement results (OWDte-down, OWDte-up, and TWDte) of the one-way delay measurement and the round-trip delay measurement by the delay measurement control step; Including, The delay measurement control step performs one-way delay measurement in the one-way delay measurement section for a predetermined period at predetermined time intervals, and outputting an average value of the one-way delay measurement value for the period as the one-way delay measurement result; The network measurement method is characterized in that the delay measurement control step controls so that the one-way delay measurement result is not output when the average value exceeds a preset threshold.

12. The network measurement method of claim 11, wherein the common clock is Coordinated Universal Time (UTC).

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