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 performing one-way delay measurement on a desired section of a communication network.

Background Art

[0002] In a network measurement system, as a measurement function of a communication network, there is one having an OWD measurement function for measuring a one-way delay amount (One Way Delay: OWD) in a desired section, a time error measurement (estimation) function for measuring packet TE (Packet Time Error), and the like.

[0003] In order to perform one-way delay measurement of a communication network with a network measurement system, for example, it is necessary to arrange a plurality of enclosures having a network measurement function at desired positions such as the transmission side and the reception side of packet transmission, and share a common clock in each enclosure.

[0004] As an example of a network measurement device that enables operation using a common clock, a 5G network that operates in time synchronization with reference time information acquired from GNSS (Global Navigation Satellite System) satellites is used as a measurement target, and it is sequentially moved to a desired test site and connected to any one of a plurality of base stations at each test site. After that, positioning at the test site is started based on reception signal information from GNSS satellites, and a portable device that measures the performance of a 5G network after achieving time synchronization with GNSS satellites has been conventionally known (for example, see Patent Document 1).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The conventional network measurement device described in Patent Document 1 is of a portable type. Each time it is moved to a test location, the GNSS antenna and the reception position are adjusted, and measurement is started after reliable reception signal information from GNSS satellites can be obtained (after reliable time synchronization is obtained).

[0007] On the other hand, in a system configuration where a plurality of enclosures are arranged at each position of a communication network for one-way delay measurement, as an example of a method for making the clocks assumed in each enclosure common, there is a method of using a GNSS receiver to obtain, for example, Coordinated Universal Time (UTC) and using it as a common clock.

[0008] However, in the case of the above-described system configuration, signals from GNSS cannot always be obtained in all environments. For example, even though the device on one end side of the one-way delay section in the communication network (for example, a user terminal) is outdoors and time information from GNSS satellites can be obtained at the position corresponding to the device on that one end side, the device on the other end side of the one-way delay section (for example, a server device) is provided in a data sensor, and an environment where it is difficult to obtain time information from GNSS satellites at the position corresponding to the device on the other end side can be considered. In such an environment, even if enclosures are arranged corresponding to each device at both ends of the one-way delay section, on the device side arranged in the data center, for example, UTC cannot be obtained as a common clock, and the result is that a common clock cannot be shared between the two devices, inevitably reducing the accuracy of one-way delay measurement.

[0009] As described above, in the conventional network measurement system, it has been difficult to perform high-precision one-way delay measurement in an environment where it is difficult for a device on one end side of the one-way delay measurement section of the communication network to obtain time information synchronized with so-called 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), the server device and the terminal each having an acquisition means (52) for acquiring time information as a common clock, the server device being connected to the terminal or being located outside the data center and connected to the server device, and measuring one-way delay (OWD) 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. up , O.W.D. down The first and second network measurement devices have a delay measurement control means (62) that performs one-way delay measurement and round-trip delay measurement in parallel with the server device based on a delay measurement signal for measuring time error, in accordance with one-way delay measurement in the one-way delay measurement section while connected to the server device, and a measurement result (OWD) of the one-way delay measurement and the round-trip delay measurement by the delay measurement control means. 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 (

[0012] With this configuration, the network measurement system according to claim 1 of the present invention can correct the one-way delay amount due to the time error of the clock of the server device even in an environment where it is difficult for one end side (for example, the server device side) of the one-way delay measurement section to obtain the time information of the common clock. As a result, both network measuring devices can operate in an environment equivalent to when they can both obtain the time information of the common clock. Thereby, under conditions of high time accuracy, while performing one-way delay measurement for the one-way delay measurement section, the time error of the one-end side device is estimated, and accurate measurement of the one-way delay considering the time error estimation result can be performed.

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

[0014] With this configuration, the network measurement system according to claim 2 of the present invention can operate in an environment equivalent to when both network measuring devices can obtain time information synchronized with UTC. Thereby, under conditions of high time accuracy, while performing one-way delay measurement for the one-way delay measurement section, the time error of the one-end side device is estimated, and accurate measurement of the one-way delay considering the time error estimation result can be performed.

[0015] Further, the network measurement system according to claim 3 of the present invention is directed to a communication network (1) having a core network of a predetermined communication method as the network, the server device being connected to the core network and disposed within a data center (30), and an access network for the terminal to access the core network, and may be configured to measure a one-way delay related to data transmission between the terminal and the server device.

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

[0017] In the network measurement system according to claim 4 of the present invention, the access network may have a base station (11) that communicably accommodates the terminal, 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 the terminal and the server device in the communication network in the same procedure regardless of whether the base station and the terminal are connected by wire or wirelessly in the access network.

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

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

[0021] In the network measurement system according to claim 6 of the present invention, the first network measuring device and the second network measuring device may have a transceiver unit (58) that conforms to a predetermined communication standard, and may 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 the one-way delay between the terminal and the server device, the one-way and round-trip delays with the server device.

[0023] Also, in the network measurement system according to claim 7 of the present invention, the delay measurement control means may be configured to perform one-way delay measurement in the one-way delay measurement section at a preset time interval for a preset period, and output the average value of the one-way delay measurement values in the period as the one-way delay measurement result.

[0024] With this configuration, even when extreme variations occur in the one-way measurement values for the one-way delay measurement section in the network measurement system according to claim 7 of the present invention, the influence of such variations can be reduced, and the uncertainty of the one-way delay in the communication network can be eliminated.

[0025] Also, in the network measurement system according to claim 8 of the present invention, the delay measurement control means may be configured to control so as not to output the one-way delay measurement result when the average value exceeds a preset threshold value.

[0026] With this configuration, the network measurement system according to claim 8 of the present invention can prevent the one-way delay measurement result from fluctuating beyond a preset threshold value, enabling high-precision one-way delay measurement and reducing the influence on the estimation result of the time error.

[0027] Also, the network measurement system according to claim 9 of the present invention further includes a data analysis processing device (70, 70A) arranged to be communicable with the first network measurement device and the second network measurement device, and the data analysis processing device includes the one-way downlink delay measurement result (OWD down ) from the server device to the terminal by the first network measurement device, the one-way uplink delay measurement result (OWD up ) from the terminal to the server device by the second network measurement device, and the time error estimation result (TWD te) and a collection means (71) for collecting them, and 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 based on the time error estimation result of the server device, a one-way delay correction means (72) for correcting the downstream one-way delay measurement result and the upstream one-way delay measurement result may be provided.

[0028] With this configuration, in the network measurement system according to claim 9 of the present invention, the one-way delay correction means of the data analysis processing device analyzes 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 then, based on the time error estimation result of the server device, can easily correct the downstream one-way delay measurement result and the upstream one-way delay measurement result, and more accurate one-way delay measurement can be achieved.

[0029] Further, in the network measurement system according to claim 10 of the present invention, the data analysis processing device (70A) may be configured to be provided in the server device constituting the communication network.

[0030] With this configuration, the network measurement system according to claim 10 of the present invention can simply and inexpensively realize a system configuration for achieving accurate one-way delay measurement by arranging the data analysis processing device inside the server device.

[0031] Further, in the network measurement system according to claim 11 of the present invention, the data analysis processing device (70) may be configured to be communicably arranged outside the communication network with the first network measuring device and the second network measuring device.

[0032] With this configuration, the network measurement system according to claim 11 of the present invention can arrange the data analysis processing device at an arbitrary position separated from the first network measuring device and the second network measuring device, and the flexibility in constructing a system for achieving accurate one-way delay measurement is improved.

[0033] In order to solve the above problems, the network measurement method according to claim 12 of the present invention is a network measurement method for measuring the one-way delay between the server device connected to the network and the edge connecting the terminal using the network measurement system according to claim 1, comprising: a connection step (S1) of connecting the first network measuring device to the terminal and installing the second network measuring device outside the data center and then connecting it to the server device; a one-way delay measurement step (S4 - S6) of measuring the one-way delay (OWD up , OWD down ) in the one-way delay measurement section in an environment where the first network measuring device and the second network measuring device are affected by the time information obtained from the clock (28) of the server device; a delay measurement control step (S11, S12) in which the second network measuring device performs one-way delay measurement and round-trip delay measurement based on a delay measurement signal for time error measurement in parallel between the second network measuring device and the server device in accordance with the one-way delay measurement in the one-way delay measurement section; and a time error estimation step (S13) of estimating the time error (T err ) of the server device in which the time error between the time information of the common clock acquired by the acquisition means and the time information obtained from the clock is reflected based on the measurement results (OWD te-down , OWD te-up , and TWD te ) of the one-way delay measurement and the round-trip delay measurement by the delay measurement control step.

[0034] With this configuration, the network measurement method according to claim 12 of the present invention can correct the one-way delay amount due to the time error of the clock of the server device even in an environment where it is difficult for one end side (for example, the server device side) of the one-way delay measurement section to acquire the time information of the common clock. As a result, both network measuring instruments can operate in an environment equivalent to when they can both acquire the time information of the common clock. Thereby, under conditions of high time accuracy, while performing one-way delay measurement targeting the one-way delay measurement section, the time error of the device on one end side is estimated, and accurate measurement of the one-way delay can be performed in consideration of the time error estimation result.

Effect of the Invention

[0035] The present invention can provide a network measurement system and a network measurement method capable of accurately measuring the one-way delay of a one-way delay measurement section even in an environment where 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 a common clock, for example, UTC.

Brief Description of the Drawings

[0036]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0037] (Summary of the Invention) The network measurement system according to the present invention measures the delay with an application in a data center via a network. Specifically, the network measurement system according to the present invention is adapted to measure the one-way delay between a device (for example, a server device) that executes an application and an edge that connects to a terminal, both of which are connected to the network.

[0038] The network measurement system according to the present invention is configured to include a server device connected to a network and network measuring devices respectively arranged corresponding to terminals. 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 measuring devices. The network measurement system according to the present invention has a function of correcting an error in the one-way delay measurement result caused by the above time error.

[0039] (Embodiment) Hereinafter, embodiments of the network measurement system and the network measurement method according to the present invention will be described with reference to the drawings. First, the configuration of the communication network 1 to be measured for one-way delay by the network measurement system 5 according to an embodiment of the present invention will be described with reference to FIG. 1. In FIG. 1, in particular, a configuration is exemplified in which the measurement target is 5G, and the core network 21 and the server device 22 of the communication network 1 are provided in the same data center 30. Note that the communication network 1 is merely an example of the communication network to be measured by the network measurement system 5 according to the present embodiment, and is not limited to the configuration shown in FIG. 1. For example, the measurement target may be other than 5G, and the core network 21 and the server device 22 of the communication network 1 may be provided in another data center 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 has a configuration in which the UE 10 and the server device 22 arranged in the data center 30 can transmit and receive packets for delay measurement.

[0041] In communication network 1, as the UE 10, for example, various communication devices compatible with 5G such as mobile communication terminals like smartphones and PCs (Personal Computers) are used. The UE (User Equipment) 10 constitutes the terminal of the present invention. As the base station 11, for example, a base station eNB for 4G or a base station gNB for 5G can be used. The base station 11 is provided outside the data center 30.

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

[0043] The data center 30 is provided within a building, and for example, a server device 22 having a transmission / reception unit 23 for transmitting and receiving data to and from the UE 10 via the base station 11 and the core network 21 (provided within the data center 30) is arranged.

[0044] In addition to the transmission / reception unit 23, the server device 22 has functional blocks such as a control unit 24 and a storage unit 25 (see FIG. 4). The control unit 24 is constituted by a computer device, and for example, by executing a control program stored in the storage unit 25, the server device 22 can function as a device capable of providing communication services such as a data providing service for receiving access from various clients and providing the requested data to the clients, and a connection service for connecting the clients to the requested access destinations based on the above access.

[0045] In the communication network 1 having the above configuration, the UE 10 can access the server device 22 as necessary and utilize the communication services provided by the server device 22. In order to smoothly operate this communication service, it is necessary for the UE 10 to clear in advance the capabilities corresponding to the communication service. Prior to such operation, the network measurement system 5 is used to evaluate the above capabilities of the UE 10. The network measurement system 5 sets, in the communication network 1, for example, the data transmission section from the UE 10 to the server device 22 as a one-way delay measurement section, and performs one-way delay measurement in the one-way delay measurement section. The measurement result of this one-way delay measurement is used to evaluate the capabilities of the UE 10.

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

[0047] The network measuring devices 50A and 50B have the same configuration and are respectively arranged (connected) and operated at both ends of the above-described one-way delay measurement section (the UE 10 side or the server device 22 side). For example, when the network measuring devices 50A and 50B are arranged on the UE 10 side, they perform control to send a one-way delay measurement signal (measurement packet) from the UE 10, and when they are arranged on the server device 22 side, they capture the one-way delay measurement signal sent from the UE 10 on the transmission path of the server device 22, and measure the one-way delay (OWD up ) in the upstream direction in the delay measurement section. This measurement of the upstream one-way delay (OWD up ) is executed, for example, using Stream #2 in the communication network 1.

[0048] Also, in the same connection state as described above, for example, a network measuring instrument 50B (or network measuring instrument 50A) arranged on the server device 22 side controls the server device 22 to send a one-way delay measurement signal, and a network measuring instrument 50A (or network measuring instrument 50B) arranged on the UE10 side captures the one-way delay measurement signal received by the UE10, and measures the one-way delay (OWD down ) in the downlink direction in the delay measurement section. This measurement of the downlink one-way delay (OWD down ) is executed using, for example, Stream♯1 in the communication network 1. The network measuring instruments 50A and 50B respectively constitute the first network measuring instrument and the second network measuring instrument of the present invention.

[0049] Both the network measuring instruments 50A and 50B have a GNSS reception function (GNSS receiver 52). Both the network measuring instruments 50A and 50B obtain UTC from the GNSS reception information (however, when arranged corresponding to the server device 22, it is necessary to be arranged outside the data center 30), and can be used as a common clock in the one-way delay measurement. Note that, as an example of the embodiment of the present invention, an example of obtaining UTC and using it as a common clock is used for explanation, but it is not limited to UTC as long as it can be used as a common clock. For example, it may be configured to use the Japan Standard Time (JST) or another standard as a common clock.

[0050] In the configuration of the network measuring instruments 50A and 50B, the GNSS reception function is cited as an example of an effective component for performing measurement processing in synchronization with a highly accurate clock synchronized with UTC. As another configuration for realizing measurement processing in synchronization with a highly accurate clock synchronized with UTC, for example, a configuration equipped with NTP (Network Time Protocol) or PTP (Precision Time Protocol) is also possible.

[0051] The detailed configurations of the network measuring instruments 50A and 50B will be described with reference to FIGS. 2 and 3. FIG. 2 shows the configuration of the network measuring instrument 50A, and FIG. 3 shows the configuration of the network measuring instrument 50B. In FIG. 2, a configuration is shown assuming that the network measuring instrument 50B is connected to the server device 22, while the network measuring instrument 50A is connected to the UE 10 via the network measurement terminal 59 and operated.

[0052] (Network Measuring Instrument 50A) As shown in FIG. 2, the network measuring instrument 50A includes an antenna input terminal 51, a GNSS receiver 52, a signal processing device 53, a measurement module 54, a display operation unit 55, a storage unit 56, a control unit 57, a transceiver unit 58, and a network measurement terminal 59.

[0053] The antenna input terminal 51 is a terminal for inputting a reception signal by the GNSS antenna 45 for receiving a signal transmitted from a GNSS satellite. The network measuring instrument 50A has a configuration in which the GNSS antenna 45 is detachable from the antenna input terminal 51.

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

[0055] The signal processing device 53 is a functional unit that inputs the reception signal information from the GNSS satellite output by the GNSS receiver 52, performs various signal processes based on the reception signal information, and sends the processing result to the display operation unit 55. Based on the reception signal information, the signal processing device 53 executes, for example, a positioning process for calculating information such as the latitude, longitude, and altitude of the location, and outputs these pieces 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. As measurement operations performed by the measurement module 54, there are measurements of one-way delay amounts (OWD up and OWD down ) for a predetermined delay measurement section of the communication network 1 (see FIGS. 1 and 5), one-way delay amounts (OWD te-up and OWD te-down ) between the measurement module 54 and the server device 22 when the measurement module 54 is arranged (connected) on the server device 22 side, an estimation function of round-trip delay amount (Two Way Delay: TWD te ), and time error (T err ) (see FIG. 6).

[0057] The display operation unit 55 is composed of a display function, an input operation function, and a touch panel that serves both functions. 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 of measurement conditions for one-way delay measurement, and instructions for starting and ending one-way delay measurement and the like.

[0058] The storage unit 56 stores various control information necessary for one-way delay measurement, programs executed to realize the functions of the setting control unit 60, the positioning control unit 61, the delay measurement control unit 62, and the display control unit 64 in the control unit 57 described later, one-way delay measurement and round-trip delay measurement between the measurement module 54 and the server device 22 by the delay measurement control unit 62, and various control information necessary for estimating the time error T err , and stores various information such as those measurement result information.

[0059] The control unit 57 controls the entire network measuring device 50A and has 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 functional unit that receives a setting operation by the input operation function of the display operation unit 55 and sets various types of information corresponding to the setting operation. The setting control unit 60 performs various settings related to conditions such as, for example, one-way delay measurement in a one-way delay section, one-way delay measurement and round-trip delay measurement with the server device 22, and estimation of the time error T err and is a functional unit that performs various settings related to the above conditions.

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

[0062] The delay measurement control unit 62 drives and controls the measurement module 54 to execute 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 in the setting control unit 60. After the above-described one-way delay measurement is completed, the delay measurement control unit 62 may perform a process of storing the measurement result (measurement data) of the one-way delay measurement in a predetermined storage area of the storage unit 56, for example, so that it can be collected from the outside later (see FIGS. 7 and 8).

[0063] The display control unit 64 performs control to display various types of information, 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 result of the one-way delay section by the delay measurement control unit 62, on the display functional unit of the display operation unit 55.

[0064] The transmission / reception unit 58 transmits and receives signals conforming to a predetermined communication standard to and from the UE 10 connected to the network measurement terminal 59. Examples of the predetermined communication standard include Ethernet and the like.

[0065] (Network measuring instrument 50B) Next, the configuration of the network measuring instrument 50B will be described with reference to FIG. 3. In FIG. 3, while the network measuring instrument 50A is connected to the UE 10, a configuration is shown in which the network measuring instrument 50B is connected to the server device 22 via the network measurement terminal 59 and operated. In FIG. 3, the same reference numerals are given to the parts similar to those of the network measuring instrument 50A shown in FIG. 2.

[0066] As shown in FIG. 3, the network measuring instrument 50B is composed of functional blocks equivalent to those of the network measuring instrument 50A, except that a time error estimation unit 63 is provided as a component of the control unit 57. However, in the control unit 57 of the network measuring instrument 50B, when the network measuring instrument 50B is connected to the server device 22 and operated, the delay measurement control unit 62, based on the settings in the setting control unit 60, in addition to the one-way delay measurement operation targeting the one-way delay measurement section, also controls to execute the measurement operations of one-way delay measurement and round-trip delay measurement (see FIGS. 6(a) and (b)) between the network measuring instrument 50B and the server device 22.

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

[0068] Note that in the network measuring instrument 50B, the delay measurement control unit 62 may store the measurement results of the above-described one-way delay measurement, the measurement results (measurement data) of the one-way delay measurement and the round-trip delay measurement between the network measuring instrument 50B and the server device 22, so that they can be collected from the outside later (see FIGS. 7 and 8), for example, in a predetermined storage area of the storage unit 56.

[0069] ​Note that, regarding the configurations shown in FIGS. 2 and 3, it is assumed that the network measuring instruments 50A and 50B are connected to the UE 10 and the server device 22 respectively to perform one-way delay measurement. The network measuring instrument 50B has a time error estimation unit 63, while the network measuring instrument 50A does not have a time error estimation unit 63. However, the network measuring instruments 50A and 50B may be connected to the server device 22 and the UE 10 respectively and operated. To cope with such operation, both of them may have a configuration (similar configuration) with a time error estimation unit 63.

[0070] Assuming that the network measuring instrument 50A and the network measuring instrument 50B have the same configuration, in the one-way delay measurement for the one-way delay measurement section of the communication network 1, one of them is connected to one end side of the one-way delay measurement section (the device side that transmits the one-way delay measurement signal), and the other is connected to the other end side of the one-way delay measurement section (the device side that receives the one-way delay measurement signal) and operated. Here, the network measuring instrument 50A and the network measuring instrument 50B connected to the one end side and the other end side may be interchanged. In FIG. 1, in the communication network 1, the network measuring instrument 50A is arranged to be connected to the UE 10 which is the transmission side of the signal related to the one-way delay measurement, and the network measuring instrument 50B is arranged to be connected to the server device 22 which is the reception side of the signal related to the one-way delay measurement and is arranged in the data center 30 as an example.

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

[0072] On the other hand, the network measuring instrument 50B is installed in the communication network 1 so that the transmission / reception unit 23 of the server device 22 is connected to the network measurement terminal 59 (see FIG. 3). The delay measurement control unit 62 captures the above-described one-way delay measurement signal received by the transmission / reception unit 23 and performs one-way delay measurement between the UE 10 and the server device 22 based on the signal.

[0073] Contrary to the mode shown in FIG. 1, in the communication network 1, it is also possible to arrange the network measuring instrument 50B to be connected to the UE 10 and the network measuring instrument 50A to be connected to the server device 22. In this case, the network measuring instrument 50B controls the driving of the UE 10, and the network measuring instrument 50A accesses the transmission / reception unit 23 of the server device 22 to perform one-way delay measurement.

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

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

[0076] The transmission / reception unit 23 has a signal transmission unit 23a and a signal reception unit 23b, and is connected to the base station 11 via the core network 21. In the transmission / reception unit 23, the signal transmission unit 23a receives a signal directed to the UE 10 from the control unit 24 and sends it out to the core network 21, and the signal reception unit 23b receives a signal directed from the UE 10 to the control unit 24 from the core network 21 and inputs it to the control unit 24.

[0077] In the server device 22, a network measuring device (for example, 50B) is connected to the path between the signal transmission unit 23a and the signal reception unit 23b and the core network 21, and the one-way delay measurement described above, or the one-way and two-way delay measurements between the network measuring device 50B and the server device 22 are carried out.

[0078] The control unit 24 comprehensively controls the operation of the entire server device 22. As an example of control, when performing one-way delay measurement for the section between the UE 10 and the server device 22, for example, the control unit 24 transmits and receives control signals and the like via the transmission and reception unit 23 to and from the delay measurement control unit 62 of the network measuring device 50B connected to the above-mentioned path (that is, in cooperation with the delay measurement control unit 62) to execute the one-way delay measurement. Further, the control unit 24 cooperates with the delay measurement control unit 62 of the network measuring device 50B to perform control of one-way and round-trip delay measurements between the server device 22 and the server device 22, and further, time error estimation of the server device 22. Here, when performing one-way delay measurement between the UE 10 and the server device 22 described above, one-way and round-trip delay measurements between the server device 22 and the server device 22, and further, time error estimation of the server device 22, the control unit 24 may store their measurement results (measurement data) in a predetermined storage area of the storage unit 25 so that they can be collected from the outside later (see FIGS. 7 and 8).

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

[0080] The operation unit 26 is a functional unit for inputting various information such as commands. 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 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 particularly 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 the present embodiment will be described with reference to the flowchart shown in FIG. 5.

[0083] In the network measurement system 5 according to the present 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 a network measuring instrument 50A is connected to the device on the transmission side of the one-way delay measurement signal, and a network measuring instrument 50B is connected to the device on the reception side of the one-way delay measurement signal (step S1).

[0084] Here, when the one-way delay measurement section is, for example, between the UE 10 and the server device 22, as shown in FIG. 1, the network measuring instrument 50A is connected to the UE 10 and the network measuring instrument 50B is connected to the server device 22 in a state where one-way delay measurement is possible.

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

[0086] When the setting of the network measurement conditions is completed and the preparation for measurement is complete, an operation to instruct the start of measurement is performed on the network measuring instrument 50A on the above-described setting screen (step S3).

[0087] Upon receiving an instruction to start measurement, in the network measuring device 50A, in the control unit 57, the delay measurement control unit 62 drives and controls the UE10 to transmit a one-way delay measurement signal from the UE10, which is a device on one end side, to the server device 22, which is a device on the other end side, based on the settings in the above step S2. For example, when the measurement direction is upstream. At this time, the network measuring device 50A also performs control to add a time stamp indicating the transmission time of the signal to the one-way delay measurement signal (step S4). The time stamp added at this time is the time information obtained by the GNSS receiver 52 in the network measuring device 50A processing the information received from the GPS (Global Positioning System) 40 by the GNSS antenna 45.

[0088] The one-way delay measurement signal transmitted from the UE10 in the above step S4 is transmitted to the server device 22 through a path corresponding to a preset one-way delay measurement section of the communication network 1. Specifically, in the configuration of the communication network 1 shown in FIG. 1, the one-way delay measurement signal transmitted from the UE10 is transmitted through a path that uses, for example, Stream#2 and passes through the base station 11 and the core network 21 and passes through the transceiver unit 23 in the server device 22.

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

[0090] Next, the delay measurement control unit 62 extracts the time stamp added to the captured one-way delay measurement signal, and compares the time information indicated by the time stamp with the time information obtained by processing the information received by the GNSS receiver 52 from the GPS 40 on the own unit side, and calculates the one-way delay amount OWD up-raw [ms] (Step S6).

[0091] Subsequently, the delay measurement control unit 62 performs a process of storing the one-way delay amount OWD up-raw calculated in Step S6 into a predetermined storage area preset in the storage unit 56, for example (Step S7).

[0092] Note that the measurement of the one-way delay amount OWD up-raw between the UE 10 and the server device 22 in Steps S4 to S7 is continuously performed during the measurement period set in Step S2, and when the measurement period ends, a series of one-way delay measurements targeting the uplink path between the UE 10 and the server device 22 are terminated.

[0093] In FIG. 5, the measurement operation of the one-way delay amount OWD up-raw targeting the uplink path between the UE 10 and the server device 22 has been described. For the same section, after setting the server device 22 as the one-end device and the UE 10 as the other-end device, the measurement operation of the one-way delay amount OWD down-raw in the downlink path can also be performed in the same procedure (see FIG. 5) using Stream#1. However, at this time, the network measurement device 50B instructs the server device 22 to send a one-way delay measurement signal, and the network measurement device 50A controls the UE 10 to receive (capture) the signal.

[0094] The one-way delay (OWD up-raw , OWD down-raw)Regarding the measurement, according to the configuration of the communication network 1 according to the present embodiment, since the server device 22 on one side is in the data center 30 (see FIG. 1), the one-way delay (OWD up 、OWD down ) measurement in the one-way delay measurement section using the network measuring instruments 50A and 50B will be carried out in an environment affected by the time information obtained from the clock 28 of the server device 22.

[0095] Regarding this point, in the network measurement system 5 according to the present embodiment, as will be described in detail later, one of the network measuring instruments (for example, 50B) estimates the time error T err of the server device 22 from the measurement results of the one-way delay measurement and the round-trip delay measurement between the server device 22, and has a function of correcting the one-way delay (OWDup, OWDdown). As a result, even if it is in an environment affected by the time information obtained from the clock 28 of the server device 22, both network measuring instruments 50A and 50B can operate in an environment equivalent to when they can both obtain time information synchronized with UTC. Therefore, under conditions of high time accuracy, while performing one-way delay measurement for the one-way delay measurement section, the time error of one end device can be estimated, and accurate one-way delay measurement considering the time error estimation result can be performed.

[0096] (Time error estimation process of server device 22) Next, the estimation operation of the time error T err of the server device 22 by the network measurement system 5 according to the present embodiment will be described. Here, in particular, the estimation operation of the time error T up ) of the server device 22 performed in accordance with the measurement of the one-way delay amount (OWD err ) in the uplink path in the one-way delay measurement section between the UE10 and the server device 22 will be described as an example.

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

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

[0099] The time error estimation process of the server device 22 by the delay measurement control unit 62 will be described with reference to FIG. 6. In the network measurement device 50B, when the delay measurement control unit 62 receives a one-way delay measurement signal from the UE 10, it executes, for example, the respective control sequences shown in FIGS. 6(a) and 6(b) with the control unit 24 of the 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), as a pattern of one-way delay measurement between the delay measurement control unit 62 and the server device 22, there is a pattern 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 time error measurement using the Stream #3.

[0101] Upon receiving the above instruction, the control unit 24 of the server device 22 transmits a delay measurement signal for time error measurement with a time stamp added to the network measurement 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 one-way delay amount OWD in the downstream direction, which is the time corresponding to the difference between the reception time and the time information indicated by the timestamp added to the delay measurement signal. te-down The delay measurement control unit 62 then performs a process of calculating the one-way delay amount OWD. te-down The calculated one-way delay amount OWD is stored, for example, in a predetermined storage area of the storage unit 56.

[0103] Here, an example is given where the delay measurement control unit 62 and the control unit 24 of the server device 22 cooperate to calculate the one-way delay amount OWD in the downstream direction. Similarly, as shown by the dotted line in Fig. 6(a), it is also possible to calculate the one-way delay amount OWD in the upstream direction. In the time error estimation process of the server device 22 described later, only one of OWD and OWD is required. Therefore, in the following, OWD will be used. te-down te-up te-down te-up te-down te

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

[0105] When the delay measurement control unit 62 receives the delay measurement signal sent back from the server device 22, it calculates the round-trip delay amount TWD, which is the time corresponding to the difference between the reception time and the time information indicated by the timestamp added to the delay measurement signal.

[0105] te tePerform the process of calculating as. Further, the delay measurement control unit 62 stores the calculated round-trip delay amount TWD te in a predetermined storage area of the storage unit 56, for example, in association with the one-way delay amount OWD te-down (or OWD te-up ) that is already stored.

[0106] Furthermore, in the network measuring device 50B, the time error estimating unit 63 estimates the time error T te-down (or OWD te-up ) and the round-trip delay time TWD te obtained by the control sequence shown in FIGS. 6(a) and (b), and estimates the time error T err of the server device 22 by performing an operation as shown in the following formula (1) (see FIG. 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 of the server device 22 corresponds to the value obtained by subtracting the time error in the one-way delay between the network measuring device 50B (for example, the downlink time error OWD te ) from half of the round-trip delay TWD between the network measuring device 50B. te-down ) from half of the round-trip delay TWD between the network measuring device 50B.

[0108] On the other hand, from the above formulas (2) and (3) using the previously obtained OWD down-raw , OWD up-raw (see FIG. 1), the following can be understood. The accurate (in a state synchronized with UTC) downlink one-way delay amount OWD downis the one-way downlink delay amount (measured value) OWD down-raw plus the time error T of the server device 22 obtained by the above formula (1). err The accurate one-way uplink delay amount OWD (in a state synchronized with UTC) between the UE 10 and the server device 22 up is the one-way uplink delay amount (measured value) OWD up-raw minus the time error T of the server device 22 obtained by the above formula (1). err It can be considered as the subtracted value.

[0109] From these points, if the time error T of the server device 22 that can be expressed by the above formula (1) err is known, using the above formulas (2) and (3), the one-way uplink delay amount OWD up , and the one-way downlink delay amount OWD down can be corrected to the accurate values when there is no time error T err It can be understood that this is possible.

[0110] Here, the data of the one-way uplink delay amount OWD up-raw is stored in the storage unit 56 of the network measuring instrument 50A, for example, and the data of the one-way downlink delay amount OWD down-raw and the time error T of the server device 22 err are stored in a predetermined storage area of the storage unit 56 of the network measuring instrument 50B, for example, during the execution of the above-described control sequence (see FIG. 6).

[0111] Accordingly, in the network measurement system 5 according to the present embodiment, the one-way uplink delay amount OWD in the one-way delay measurement section of the communication network 1 stored in each of the above storage areas up-raw , the one-way downlink delay amount OWD down-raw , and the time error T of the server device 22 err are read out, and using the above formulas (1), (2), and (3), the one-way uplink delay amount OWD up-raw , and the one-way downlink delay amount OWD down-raw are corrected, so that the accurate one-way uplink delay amount OWD with the time error T of the server device 22 err eliminatedup and the one-way downward delay amount OWD down It becomes possible to calculate the value of. Next, the one-way delay correction function provided in the network measurement system 5 according to the present embodiment will be described.

[0112] (One-way delay correction function) The network measurement system 5 according to the present embodiment corrects the value of the one-way delay measured by the network measurement devices 50A and 50B based on the values of the one-way and round-trip delays between the server device 22 measured by the network measurement device 50B and the time error T err of the server device 22, and has a processing function for correction.

[0113] Regarding the process of correcting the measured one-way delay value, the one-way delay measurement by the two network measurement devices 50A and 50B, the one-way and round-trip delay measurements between the server device 22 by one network measurement device 50B, and the time error T err of the server device 22 are estimated, and after the respective measurement data are stored, the measurement data are collected and analyzed, and then the process is carried out.

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

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

[0116] In the first arrangement, the data analysis processing device 70 is realized by an information processing device such as a PC having a communication function and an information processing function, for example. In the example shown in FIG. 7, the data analysis processing device 70 is communicably connected to each of the network measuring devices 50A and 50B and the server device 22. The data analysis processing device 70 performs one-way delay measurement between the above-described UE 10 and the server device 22, one-way and round-trip delay measurements with the server device 22, and time error T of the server device 22 err After the estimation of err is completed, at a predetermined timing, it accesses the respective data storage areas of the network measuring devices 50A and 50B, and has a data collection unit 71 that collects and analyzes the measurement data stored in the data storage areas of each part. 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 measuring device 50A, and from its data storage area, the one-way delay data Da (= ODW down_raw ) in the downstream direction between the UE 10 and the server device 22 is collected.

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

[0119] In the network measurement system 5 according to the present embodiment, the one-way delay data Dc (= OWD te-down (or OWD te-up) Reciprocal delay data Dd (= TWD te ) The time error data De (T of the server device 22 err ) may be configured to be stored in the storage unit 25 (see FIG. 4) of the server device 22. In this case, as illustrated by the measurement data (Dc, Dd, De) in parentheses between the server device 22 and the data analysis processing device 70 in FIG. 7, the data collection unit 71 accesses the storage unit 25 of the server device 22, and the one-way delay data Dc (= OWD between the server device 22 stored in the data storage area te-down (Or, OWD te-up ) Reciprocal delay data Dd (= TWD te ) The time error data De (= T of the server device 22 err ) may be collected.

[0120] As described above, after the network measuring instruments 50A and 50B (or the server device 22) collect each measurement data, the data analysis processing device 70 uses the collected measurement data to measure the one-way delay in the one-way delay measurement section (between the UE 10 and the server device 22) on the communication network 1. The one-way delay measurement data (= ODW down_raw , ODW 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 corrects the one-way delay data Da and Db collected from the network measuring instruments 50A and 50B using the one-way delay data Dc, the reciprocal delay data Dd, and the time error data De of the server device 22 collected from the network measuring instrument 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, when the value of the time error data De (= T of the server device 22 collected from the network measuring instrument 50B (or the server device 22) err ) is obtained by the above formula (1) (T err = TWD te / 2 - OWD te-downAssume that it is so. At this time, the one-way delay correction unit 72 can derive the following value from the above equation (2) using the time error data De (= T down_raw ) of the server device 22 collected from the network measuring device 50B (or the server device 22) as the correction value (OWD down ) of the downstream one-way delay data Da (= OWD err ) collected from the network measuring device 50A. OWD down = OWD down-raw + T err

[0123] On the other hand, for the correction value (OWD up_raw ) of the upstream one-way delay data Db (= OWD up ) collected from the network measuring device 50B, the one-way delay correction unit 72 can derive the following value from the above equation (2) using the time error data De (= T err ) value of the server device 22 collected from the network measuring device 50B (or the server device 22). OWD up = OWD up-raw - T err

[0124] The one-way delay correction process by the one-way delay correction unit 72 described above corresponds to a situation where only one-way delay data (OWD up-raw , OWD down-raw ) including time errors can be obtained by using inaccurate time information obtained from the clock 28 (see FIG. 4) of the server device 22 by one of the network measuring devices (for example, 50B) connected to the server device 22. When the network measuring devices 50A and 50B perform one-way delay measurement while synchronizing with the UTC acquired from the GPS40 with each other, accurate one-way delay data (OWD err without time error T up , OWD down) It is possible to change to a situation where acquisition can be realized. By having this one-way delay correction function, in the network measurement system 5 according to the present embodiment, one side of the one-way delay measurement section of the communication network 1 is, for example, placed inside the data center 30, so that even in a situation where it is difficult to perform one-way delay measurements with both sides synchronized to UTC, the one-way delay between the server device 22 and the UE 10 can be measured more accurately with the one-way delay measurement section.

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

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

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

[0128] Also, the data collection function unit collects the uplink one-way delay data Db (= ODW up_rawcollects it, and together with that, the one-way delay data Dc (= OWD te-down (or OWD te-up ), the round-trip delay data Dd (= TWD te ), and the time error data De (= T err ) of the server device 22 are collected.

[0129] Here too, instead of the server device 22 storing the one-way delay data Dc (= OWD te-down (or OWD te-up ), the round-trip delay data Dd (= TWD te ), and the time error data De (= T err ) of the server device 22 that the network measuring instrument 50B stores, it is also possible to configure the server device 22 to store each of these data Dc, Dd, De in, for example, the storage unit 25 (see FIG. 4) of its own device. In this case, as illustrated by the measurement data (Dc, Dd, De) in parentheses associated with the server device 22 in FIG. 8, the data collection functional 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 te-down (or OWD te-up ), the round-trip delay data Dd (= TWD te ), and the time error data De (= T err ) of the server device 22 stored in that data storage area.

[0130] After collecting each measurement data from the network measuring instruments 50A, 50B (or the server device 22), the data analysis processing device 70A uses the collected measurement data to correct the one-way delay measurement data (= ODW down_raw , ODW up_raw ) in the one-way delay measurement section (between the UE 10 and the server device 22) on the communication network 1.

[0131] To perform this process, the data analysis processing device 70A has a one-way delay correction functional unit equivalent to the one-way delay correction unit 72 of the data analysis processing device 70 described in the first arrangement form. As a result, in the data analysis processing device 70A, the one-way delay correction functional unit uses the time error data De (= T err = TWD te / 2 - OWD te-down ) collected from the network measuring instrument 50B (or the server device 22), and using the above equations (2) and (3), calculates the correction value (OWD down_raw ) of the downstream one-way delay data Da (= OWD down ) collected from the network measuring instrument 50A, and the correction value (OWD up_raw ) of the upstream one-way delay data Db (= OWD up ) collected from the network measuring instrument 50B, respectively, as follows. OWD down = OWD down-raw + T err OWD up = OWD up-raw - T err

[0132] Also, in the one-way delay correction process by the one-way delay measurement correction functional unit of the data analysis processing device 70A of the server device 22 described above, similar to the one-way delay correction process by the one-way delay correction unit 72 of the data analysis processing device 70 according to the first arrangement form, even in a situation where it is difficult to perform one-way delay measurements synchronized with UTC on both sides because one side of the one-way delay measurement section of the communication network 1 is arranged, for example, inside the data center 30, the one-way delay between the server device 22 and the UE 10 can be measured more accurately with the one-way delay measurement section.

[0133] Note that the correction processes for the above-described one-way delay amounts OWD up , OWD down are for the downstream one-way delay data Da (= OWD down_raw ) stored in the network measuring instrument 50A, and the upstream one-way delay data Db (= OWD up_raw) The value of the time error T of the server device 22 stored in the network measuring device 50B or the server device 22, as long as it has a function that can access the storage area storing the value, not limited to the PC (see FIG. 7) or the server device 22 (see FIG. 8), it may also be configured to be performed by other modules. err If it only has a function that can access the storage area storing the value of err , not limited to the PC (see FIG. 7) or the server device 22 (see FIG. 8), it may also be configured to be performed by other modules.

[0134] Next, a specific example will be given to explain the one-way delay and the estimated result of the time error T by the network measurement system 5 according to the present embodiment. err A specific example will be given to explain the one-way delay and the estimated result of the time error T by the network measurement system 5 according to the present embodiment.

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

[0136] In the data transmission path assumed here, when estimating the one-way delay and the time error T between the data center 30 and the UE 10 (Data Center-UE) corresponding to 5G, one of the two network measuring devices 50A and 50B constituting the network measurement system 5 according to the present embodiment (network measuring device 50A) is connected to the UE 10, and the other (network measuring device 50B) is connected to the server device 22 in the data center 30. err In the data transmission path assumed here, when estimating the one-way delay and the time error T between the data center 30 and the UE 10 (Data Center-UE) corresponding to 5G, one of the two network measuring devices 50A and 50B constituting the network measurement system 5 according to the present embodiment (network measuring device 50A) is connected to the UE 10, and the other (network measuring device 50B) is connected to the server device 22 in the data center 30.

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

[0138] In this measurement target data (Latency measurement raw data), as disclosed in the lowermost part of FIG. 9, as elements causing delay, there are a delay (Data Center-UE Target dely) from the network measurement device 50A to the entrance of the server device 22 of the data center 30, and a time error (Time error) T in the server device 22. err are included.

[0139] In the communication environment shown in FIG. 9, using the network measurement system 5 according to this embodiment, one-way delay measurement between the Data Center-UE (see FIG. 5) and estimation of the time error T (see FIG. 6) in the server device 22 of the data center 30 were executed, and measurement results as shown in the table in FIG. 10 were obtained. err When the estimation of (see FIG. 6) was executed, measurement results as shown in the table in FIG. 10 were obtained.

[0140] In FIG. 10, Time indicates the measurement time. In this example, examples measured at 10:00, 10:01, 10:02, and 10:03 are given.

[0141] Raw Latency indicates the delay time of (Latency measurement raw data) shown in the middle part of FIG. 9, and the unit is milliseconds [ms].

[0142] Correction for Time Error indicates the value of the time error T of the server device 22 measured in the data center 30, shown at the right end of the lower part of FIG. 9. err The unit is milliseconds [ms].

[0143] The Data Center-UE Latency is the one-way latency between the data center and the UE, which is shown on the lower left side (adjacent to Time Error T) of Figure 9, and the unit is milliseconds [ms]. err As can be seen from the table shown in Figure 10, the one-way latency of the data (Latency measurement raw data) transmitted through the one-way latency measurement interval shown in Figure 9 is measured as the value obtained by adding the value of Time Error T of the server device 22 and the value of the one-way latency between the data center and the UE.

[0144] According to the table shown in Figure 10, when estimating the one-way latency & time error for the data center-UE shown in Figure 9, at 10:00, 10:01, 10:02, and 10:03, the one-way latencies measured were 55.456 [ms], 56.751 [ms], 77.373 [ms], and 77.373 [ms], respectively. err More specifically, regarding the one-way latency of 55.456 [ms] measured at 10:00, the value of Time Error T was 10.111 [ms], and the one-way latency between the data center and the UE was 45.345 [ms].

[0145] Also, regarding the one-way latency of 56.751 [ms] measured at 10:01, the value of Time Error T was 10.298 [ms], and the one-way latency between the data center and the UE was 46.453 [ms].

[0146] Also, regarding the one-way latency of 77.373 [ms] measured at 10:02, the value of Time Error T was 10.486 [ms], and the one-way latency between the data center and the UE was 66.887 [ms]. Furthermore, regarding the one-way latency of 55.365 [ms] measured at 10:03, the value of Time Error T err was 10.582 [ms], and the one-way latency between the data center and the UE was 44.783 [ms].

[0147] Also, regarding the one-way latency of 56.751 [ms] measured at 10:01, the value of Time Error T err was 10.298 [ms], and the one-way latency between the data center and the UE was 46.453 [ms].

[0148] Also, regarding the one-way latency of 77.373 [ms] measured at 10:02, the value of Time Error T err was 10.486 [ms], and the one-way latency between the data center and the UE was 66.887 [ms]. Furthermore, regarding the one-way latency of 55.365 [ms] measured at 10:03, the value of 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 the time error estimation results shown in the table of FIG. 10 are graphed and shown in FIG. 11. In this graph, the horizontal axis represents the measurement time (unit: hour; minute), and the vertical axis represents the one-way delay amount. The one-way delay on the vertical axis is represented by a single bar graph that can distinguish the value of Data Center-UE Latency and the value of time error T err in one distinguishable bar graph.

[0150] According to the graph of the one-way delay measurement results and the time error estimation results shown in FIG. 11, as shown by the form for each bar graph (represented by the value of Data Center-UE Latency + the value of time error T err ), it can be understood that the value of Data Center-UE Latency can be corrected to an accurate value by subtracting the value of time error T err from the value of the overall one-way delay.

[0151] (Application of one-way delay correction function) As disclosed and described in FIGS. 7 and 8, the network measuring devices 50A and 50B constituting the network measurement system 5 according to the present embodiment respectively measure the downlink one-way delay data Da (= OWD down_raw ), the uplink one-way delay data Db (= OWD up_raw ) according to the flowchart shown in FIG. 5, and store them as these measurement data Da and Db. Further, in the network measuring device 50B (or the server device 22), the value of the time error T err of the server device 22 is estimated and stored. Furthermore, in the network measurement system 5 according to the present embodiment, a data analysis processing device 70 (see FIG. 7) or a data analysis processing device 70A (see FIG. 8) is arranged outside the network measuring devices 50A and 50B, and each of these devices collects and analyzes the measurement data stored as described above, so that the time error T errIt becomes possible to measure an accurate one-way delay amount that is not affected (refer to the above equations (2) and (3)).

[0152] (Measures against fluctuations in one-way delay measurement results) According to the one-way delay measurement results and the time error estimation results shown in the table of FIG. 10, it can be seen that the delay increases or conversely decreases. Also, from such measurement results, it is quite conceivable that the delay suddenly increases and decreases significantly.

[0153] In order to improve the accuracy of one-way delay measurement, it is preferable to suppress as much as possible the temporal variation of the delay or the sudden steep variation of the delay described above. As a countermeasure for this, for example, a method of obtaining the average value of one-way delay measurement values within a predetermined period and using that average value as the measurement value (one-way delay measurement result) can be considered. Also, when a sudden variation is expected, for example, a threshold value (such as the above-mentioned average value) is set in advance, and when a delay amount exceeding the preset threshold value is measured, it is excluded from the measurement value (that is, the measurement value is not output). In either method, sudden change factors can be excluded, and the stabilization of one-way delay measurement can be achieved.

[0154] In the above embodiment, as a communication network 1 for one-way delay, a configuration example in which UE10 and base station (NB) 11 can communicate with each other via a wireless line is given. However, the present invention is not limited to this, and a configuration in which UE10 and base station (NB) 11 are connected by a wired line may also be possible.

[0155] Also, in the above embodiment, a measurement method when the one-way delay time is positive is illustrated. However, 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 conversely time is advancing). When the delay time is negative (when time is advancing), it can be dealt with by performing an operation opposite to the case when there is a delay time.

[0156] An embodiment of the network measurement system 5 according to the present invention has been described on the premise that the communication network 1 has the configuration shown in FIG. 1 (see FIGS. 2 to 11). This embodiment is merely an example, and the network measurement system 5 according to the present invention can support various measurement operations even when the communication network 1 has a configuration different from that shown in FIG. 1 (or even when it is a normal network other than 5G).

[0157] A configuration example of another communication network 1A that can be a measurement target of the network measurement system 5 according to the present invention is shown in FIG. 12. In FIG. 12, the same reference numerals are given to the same components as those shown in FIG. 1. As shown in FIG. 12, this communication network 1A is different from the communication network 1 shown in FIG. 1 (see FIG. 1) in that the core network 21 and the server device 22 are provided in different data centers 31 and 30, respectively.

[0158] As can be understood with reference to FIGS. 1 and 12, in the communication network that the network measurement system 5 according to this embodiment can support, 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, and as shown in FIG. 12, they may be provided in different data centers 31 and 30, respectively. Also, it is assumed that the core network 21 is not in the data center 31. The network measurement system 5 according to this embodiment can support the same measurements when targeting the core network 21 having the arrangement of each part shown in FIG. 12 as when having the arrangement of each part shown in FIG. 1.

[0159] As described above, the network measurement system 5 according to this embodiment measures the one-way delay between the server device 22 connected to the network and the edge connecting the terminal (UE10, PC, etc.).

[0160] The network measurement system 5 according to this embodiment includes an acquisition means by which each of the server device 22 and the terminal can acquire time information as a common clock. For example, it is connected to the UE 10 or is disposed outside the data center 30 and connected to the server device 22, and is under an environment affected by the time information obtained from the clock 28 of the server device 22. For example, the one-way delay (OWD up 、OWD down ) in a one-way delay measurement section between the UE 10 and the server device 22 is measured by a first network measuring device 50A and a second network measuring device 50B. The first network measuring device 50A and the second network measuring device 50B perform one-way delay measurement and round-trip delay measurement based on a delay measurement signal for time error measurement between the server device 22 in parallel in accordance with the one-way delay measurement in the one-way delay measurement section in a state of being connected to the server device 22. A delay measurement control unit 62 that performs the above, and based on the measurement results (OWD te-down 、OWD te-up 、and TWD te ) of the one-way delay measurement and the round-trip delay measurement by the delay measurement control unit 62, a time error estimation means (63) for estimating a time error (T err ) of the server device 22 in which the time error between the time information of the common clock acquired by the acquisition means and the time information obtained from the clock 28 of the server device 22 is reflected.

[0161] With this configuration, the network measurement system 5 according to this embodiment can correct the one-way delay amount due to the time error of the clock of the server device 22 even in an environment where it is difficult to acquire the time information of the common clock on one end side (for example, the server device 22 side) of the one-way delay measurement section. Thus, both network measuring devices 50A and 50B can operate in an environment equivalent to when they can both acquire the time information of the common clock. As a result, while performing one-way delay measurement for a one-way delay measurement section under conditions of high time accuracy, the time error of the device on one end side can be estimated, and accurate one-way delay measurement considering the time error estimation result can be performed.

[0162] In the network measurement system 5 according to the present embodiment, the common clock is Coordinated Universal Time (UTC), and the GNSS receiver 52 is provided as the acquisition means. With this configuration, the network measurement system 5 according to the present embodiment can operate in an environment equivalent to when both network measurement devices 50A and 50B can acquire time information synchronized with UTC, and under conditions of high time accuracy, it is possible to accurately measure the one-way delay considering the estimation result of the time error of the device on one end side of the one-way delay measurement section.

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

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

[0165] Also, in the network measurement system 5 according to the present embodiment, the access network 15 has a base station 11 that communicably accommodates, for example, the UE 10, and the base station 11 and the UE 10 are connected by wire or wirelessly.

[0166] With this configuration, the network measurement system 5 according to the present embodiment can measure the one-way delay between the UE 10 and the server device 22 in the communication network 1 in the same procedure regardless of whether the base station 11 and the UE 10 are connected by wire or wirelessly in the access network 15.

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

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

[0169] In addition, in the network measurement system 5 according to the present embodiment, the first network measurement device 50A and the second network measurement device 50B have a transmission / reception unit 58 that conforms to a predetermined communication standard, and are connected to, for example, the UE 10 or the server device 22 via the communication network 1.

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

[0171] In addition, in the network measurement system 5 according to the present embodiment, the delay measurement control unit 62 performs one-way delay measurement in a one-way delay measurement section at a preset time interval for a preset period, and outputs the average value of the one-way delay measurement values in the above period as a one-way delay measurement result.

[0172] With this configuration, the network measurement system 5 according to the present embodiment can reduce the influence of the variation even when extreme variations occur in the one-way measurement values for the one-way delay measurement section, and eliminate the uncertainty of the one-way delay of the communication network 1.

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

[0174] With this configuration, the network measurement system 5 according to the present embodiment can prevent the one-way delay measurement result from fluctuating beyond a preset threshold value, enabling high-precision one-way delay measurement and reducing the influence on the estimation result of the time error T err as well.

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

[0176] With this configuration, in the network measurement system 5 according to the present embodiment, the one-way delay correction unit 72 of the data analysis processing devices 70 and 70A can easily correct the downlink one-way delay measurement result and the uplink one-way delay measurement result based on the time error estimation result of the server device 22 after analyzing the downlink one-way delay measurement result, the uplink one-way delay measurement result, and the time error estimation result of the server device 22 collected by the data collection unit 71, and more accurate one-way delay measurement can be achieved.

[0177] Also, in the network measurement system 5 according to the present 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 the present embodiment can realize a system configuration for accurate one-way delay measurement simply and inexpensively.

[0178] Also, in the network measurement system 5 according to the present embodiment, the data analysis processing device 70 is configured to be communicable with a first network measuring device 50A and a second network measuring device 50B outside the communication network 1.

[0179] With this configuration, the network measurement system 5 according to the present embodiment can arrange the data analysis processing device 70 at an arbitrary position separated from the first network measuring device 50A and the second network measuring device 50B, improving the flexibility in constructing a system for realizing accurate one-way delay measurement.

[0180] Also, the network measurement method according to the present embodiment is a network measurement method for measuring the one-way delay between the server device 22 connected to the communication network 1 and the edge connecting to the terminal (UE10, PC, etc.) using the network measurement system 5 having the above-described configuration. The connection step (S1) of connecting the first network measuring device 50A to, for example, UE10, installing the second network measuring device 50B outside the data center 30 and then connecting it to the server device 22, and the one-way delay (OWD up 、OWD downA one-way delay measurement step (S4 - S6) for measuring te-down ), and a delay measurement control step (S11, S12) in which the second network measuring device 50B performs one-way delay measurement and round-trip delay measurement based on a delay measurement signal for time error measurement between the second network measuring device 50B and the server device 22 in parallel with the one-way delay measurement in the one-way delay measurement section. And a time error estimation step (S13) for estimating the time error (T te-up ), and TWD te ) of the server device 22 in which the time error between the time information of the common clock acquired by the acquisition means and the time information obtained from the clock 28 of the server device 22 is reflected. err ).

[0181] With this configuration, the network measurement method according to the present embodiment corrects the one-way delay amount due to the time error of the clock 28 of the server device 22 even in an environment where it is difficult for one end side (for example, the server device 22 side) of the one-way delay measurement section to acquire the time information of the common clock. As a result, both network measuring devices 50A and 50B can operate in an environment equivalent to when they can both acquire the time information of the common clock. Thereby, while performing one-way delay measurement for the one-way delay measurement section under high time accuracy conditions, the time error of the one-end device can be estimated, and accurate one-way delay measurement considering the time error estimation result can be performed.

Industrial Applicability

[0182] As described above, the present invention has the effect of accurately measuring the one-way delay of the one-way delay measurement section even in an environment where 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, UTC as a common clock. It is useful for a network measurement system and a network measurement method in general that two network measuring devices are respectively arranged and operated on one end side and the other end side of the one-way delay measurement section.

Explanation of Signs

[0183] 1. 1A communication network 5. Network measurement system 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 device 23, 58. Transceiver 23a. Signal transmitter 23b. Signal receiver 24, 57. Control unit 25, 56. Memory unit 26. Operation unit 27. Display unit 28. Clock 30, 31. Data center 40. GPS (Global Positioning System) 45. GNSS antenna 50A. Network measuring instrument (first network measuring instrument) 50B. Network measuring instrument (second network measuring instrument) 52. GNSS receiver (acquisition means) 53. Signal processing device 54. Measurement module 55. Display operation unit 60. Setting control unit 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 and processing device 71. Data collection unit (collection means) 72. Unidirectional delay correction unit (unidirectional delay correction means)

Claims

1. A network measurement system for measuring the one-way delay between an edge connecting a server device (22) connected to a network and a terminal (10), An acquisition means (52) for acquiring time information as a common clock is provided for each of the server device and the terminal, and is connected to the terminal or is disposed outside the data center and connected to the server device, and is under an environment affected by time information obtained from the clock (28) of the server device, and a one-way delay (OWD ｕｐ , OWD ｄｏｗｎ ) in a one-way delay measurement section between the terminal and the server device is measured by a first network measuring device (50A) and a second network measuring device (50B), and The first network measuring device and the second network measuring device, In accordance with the one-way delay measurement in the one-way delay measurement section in the state of being connected to the server device, one-way delay measurement based on a delay measurement signal for time error measurement and round-trip delay measurement are performed in parallel with the server device. Delay measurement control means (62) to be performed, The measurement results (OWD ｔｅ－ｄｏｗｎ , OWD ｔｅ－ｕｐ , and TWD ｔｅ ) of the one-way delay measurement and the round-trip delay measurement by the delay measurement control means, and a time error (T ｅｒｒ ) of the server device in which the time error between the time information of the common clock acquired by the acquisition means and the time information obtained from the clock is reflected, and a time error estimation means (63) for estimating A network measurement system, further comprising the above.

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

3. As the network, a core network of a predetermined communication method, the server device is connected to the core network, is arranged in a data center (30), and an access network for the terminal to access the core network. The network measurement system according to claim 1 or 2, wherein the one-way delay related to data transmission between the terminal and the server device is measured with respect to the communication network (1) having

4. The access network has a base station (11) that communicably accommodates the terminal, 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 according to claim 3, wherein the core network is constituted by any one of private 5G, local 5G, and 5G core network.

6. The first network measuring device and the second network measuring device have a transmission / reception unit (58) conforming to a predetermined communication standard, and are connected to the terminal or the server device via the communication network. The network measurement system according to claim 3, characterized in that

7. The delay measurement control means performs one-way delay measurement in the one-way delay measurement section at a preset time interval for a preset period, The network measurement system according to claim 1 or 2, wherein the average value of the one-way delay measurement values for the period is output as the one-way delay measurement result.

8. The network measurement system according to claim 7, wherein 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.

9. The network measurement system further includes a data analysis processing device (70, 70A) arranged to be communicable with the first network measurement device and the second network measurement device. The data analysis processing device The downstream unidirectional delay measurement result (OWD ｄｏｗｎ ) from the server device to the terminal by the first network measuring device, and the upstream unidirectional delay measurement result (OWD ｕｐ ) from the terminal to the server device by the second network measuring device, and the time error estimation result (TWD ｔｅ ) of the server device, and a collection means (71) for collecting them. analyzes 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 based on the time error estimation result of the server device, the downstream one-way delay measurement result, and the upstream one-way delay measurement result, and has a one-way delay correction means (72) for correcting the one-way delay measurement result. The network measurement system according to claim 1 or 2, characterized in that.

10. The network measurement system according to claim 9, wherein the data analysis processing device (70A) is provided in the server device constituting the communication network.

11. The network measurement system according to claim 9, wherein the data analysis processing device (70) is arranged to be communicable with the first network measurement device and the second network measurement device outside the communication network.

12. A network measurement method for measuring the one-way delay between the server device connected to the network and the edge connecting the terminal using the network measurement system according to claim 1, a connection step (S1) of connecting the first network measurement device to the terminal and connecting the second network measurement device to the server device after installing the second network measurement device outside the data center; The one-way delay measurement step (S4-S6) in which the first network measuring device and the second network measuring device measure the one-way delay (OWD ｕｐ , OWD ｄｏｗｎ ) in the one-way delay measurement section in an environment affected by the 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 and round-trip delay measurement based on a delay measurement signal for time error measurement in parallel with the server device in accordance with the one-way delay measurement in the one-way delay measurement section; The measurement results (OWD ｔｅ－ｄｏｗｎ , OWD ｔｅ－ｕｐ , and TWD ｔｅ ) of the one-way delay measurement and the round-trip delay measurement in the delay measurement control step, and a time error (T ｅｒｒ ) of the server device reflecting the time error between the time information of the common clock acquired by the acquisition means and the time information obtained from the clock are estimated in a time error estimation step (S13); A network measurement method characterized by including.

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