JP2015179996A - Communication quality monitoring device, method, system and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a suppression or a reduction of an increase in a capital investment and maintenance management man-hours for communication quality measurement monitoring.SOLUTION: A communication quality monitoring device comprises a plurality of control units having a function for receiving packets from a network and transmitting packets to the network and a function for measuring communication quality from information of the packets. One control unit makes copies of the received packets and/or packets to be transmitted and transmits the copied packets to another control unit. The latter control unit measures the communication quality by using the copied packets transmitted from the former control unit.

Description

  The present invention relates to a communication quality monitoring apparatus, method, system, and program.

  As systems for measuring and monitoring the communication quality of a network, for example, various systems that measure communication quality by copying a packet during communication are known. FIG. 6 is a diagram schematically illustrating an example of a typical system configuration of related technology for monitoring communication quality. Referring to FIG. 6, in a network system including a relay device on a user plane (U-Plane) such as a media gateway (Media Gateway: MGW) 21, a packet (for example, VoIP (Voice over Internet Protocol) that flows on the network. In order to measure the communication quality from the voice packet), a probe device 23 is inserted between the MGW 21 and the network 22 (IP network). The probe device 23 copies the U-plane data packet (voice packet) and transmits it to the quality measurement device 24. The quality measuring device 24 monitors the communication quality based on the received copy packet.

  For example, an MGW that connects an IP multimedia subsystem (IMS) to another network (PSTN (Public Switched Telephone Networks, circuit switched networks, etc.)) is an ATM (Asynchronous Transport Network). Mode) / STM (Synchronous Transport Mode) is a device that converts RTP (Real-time Transport Protocol), and is provided on the user plane (U-Plane), for example, for voice conversion between VoIP and circuit switching . For example, the IMS side uses an AMR (Adaptive Multi-Rate) codec and the PSTN side uses G.264. In the case of a codec such as 711, the MGW performs codec conversion of voice information (for example, 3GPP TS26.114 is referred to for the MGW). An MGCF (Media Gateway Control Function) (not shown in FIG. 6) is provided on the control plane (C-Plane), and the MGW is, for example, in Megaco (ITU-T (International Telecommunication Union Telecommunication Standardization Sector) recommendation H.248.1). Control. In FIG. 6, the MGW has been described as an example. However, in a system in which user terminals are connected to a network as VoIP via an access gateway (Access Gate Way: AGW), the same configuration as that of FIG. 6 can be applied to the AGW. (For AGW, see, for example, 3GPP TS23.228 Annex G).

  For example, Patent Document 1 discloses a related technique relating to the above-described communication quality pipe measurement / monitoring, between observation terminals (FIG. 6) between communication terminals that are connected end-to-end via a network. And the observation device copies the packet being communicated on the network and transmits it to the measurement server (corresponding to the quality measurement device 24 in FIG. 6), and the measurement server communicates the communication quality (for example, packet loss). Number, throughput expectation value, packet loss rate expectation value, delay time and variation thereof, and the like are disclosed.

  The RTP described above is a protocol for transferring video and audio data in real time. In RTP, in order to realize real-time transmission, synchronous clock information, sequence number, data type, etc. between transmission / reception and data are transmitted along with the data, and the receiver side reproduces the data in real time based on such information. I do. RTP does not secure resources or guarantee quality of service (QoS). Information such as bandwidth and delay time is reported to the server by RTCP (Real-time Transport Control Protocol). In the server, for example, according to the reported information, transmission is performed by adjusting the quality of data transmitted by RTP. As a related technique (well-known technique) for measuring network quality from RTP packet information, for example, in Patent Document 2, in STB (Set Top Box), when packet loss and packet jitter are detected from a received RTP packet, an RTCP packet is detected. A configuration is disclosed in which an RTT (Round Trip Time) is calculated from an RTCP packet transmitted from the own apparatus and an RTCP packet returned from the STB.

International Publication No. 2007/010763 Pamphlet JP 2009-219075 A

  The analysis of related technology is given below.

  In the related technique described with reference to FIG. 6, the communication quality measurement is performed by inserting the probe device 23 between the MGW and the network (IP network). For this reason, construction for connecting the probe device 23 to the network 22 and management of the probe device 23 and the quality measuring device 24 are required. As a result, maintenance man-hours and costs increase. That is, since a new device (equipment such as a probe and a quality measuring device) is added for monitoring the communication quality, the capital investment increases, which causes an increase in maintenance costs.

  Moreover, the physical layer is divided by arranging the probe device 23 between the MGW and the network (IP network). For this reason, it takes time to detect a network failure in the MGW. For example, failure detection is performed by monitoring in an upper layer, and this requires, for example, a time for switching a redundant configuration, compared to a case where a failure is detected in a physical layer.

  The present invention was devised in view of the above problems, and an object thereof is an apparatus, method, system, and program for suppressing and reducing an increase in equipment investment for communication quality monitoring and an increase in maintenance man-hours. Is to provide.

According to one aspect of the present invention, a control unit includes a plurality of control units having a function of receiving a packet from a network and transmitting the packet to the network, and a function of measuring communication quality from packet information. Copy the received packet and / or the packet to be transmitted and send the copied packet to the other control unit,
The other control unit is provided with a communication quality monitoring device that measures communication quality using the copy packet transmitted from the one control unit (first viewpoint).

According to another aspect of the present invention, in one control unit among a plurality of control units having a function of receiving a packet from a network and transmitting the packet to the network and a function of measuring communication quality from packet information. The received packet and / or the packet to be transmitted is copied and the copied packet is transmitted to another control unit,
The other control unit is provided with a communication quality monitoring method for measuring communication quality using a copy packet transmitted from the one control unit (second viewpoint).

  According to another aspect of the present invention, there is provided a communication quality monitoring system in which the one control unit and the other control unit are configured as different devices and connected via a network (third viewpoint). .

According to another aspect of the present invention, a communication quality monitoring apparatus including a plurality of control units having a function of receiving a packet from a network and transmitting the packet to the network, and a function of measuring communication quality from packet information. On the computers that make up
A process of one control unit that copies a received packet and / or a packet to be transmitted and copies the packet to another control unit;
Using the copy packet transmitted from the one control unit, a program for executing processing of the other control unit that measures communication quality is provided (fourth viewpoint). According to the present invention, a recording medium (for example, a semiconductor memory or a magnetic / optical recording medium) on which a fourth viewpoint program is recorded is provided (fifth viewpoint).

  According to the present invention, it is possible to suppress and reduce an increase in equipment investment, maintenance man-hours, and costs for communication quality measurement and monitoring.

It is a figure which illustrates an embodiment typically. It is a figure explaining operation | movement of embodiment. It is a figure explaining operation | movement of embodiment. It is a flowchart explaining operation | movement of embodiment. It is a figure which illustrates a packet format. It is a figure which illustrates related technology typically. It is a figure explaining the basic concept of invention.

  An embodiment of the present invention will be described. First, the basic concept of the present invention will be described. FIG. 7 is a diagram schematically illustrating the basic concept of the present invention. Referring to FIG. 7, a communication quality monitoring device (communication quality measuring device) 100 receives packet from a network and transmits packet to the network (packet processing unit / packet processing step) 102-1 and 102-2. And first and second control units 101-1, 101-having communication quality measurement functions (communication quality measurement unit / communication quality measurement step) 103-1 and 103-2 for measuring communication quality from packet information. 2 at least.

  In the first control unit 101-1, the packet processing function 102-1 copies a packet (communication quality monitoring target packet) received from the network and / or a packet (communication quality monitoring target packet) transmitted to the network. Then, the copied packet is transmitted to the second control unit 101-2 within the apparatus or via the network.

  The communication quality measurement function 103-2 of the second control unit 101-2 measures the communication quality using the copy packet transmitted from the first control unit 101-1. At this time, in FIG. 7, the communication quality measurement function 103-1 of the first control unit 101-1 and the packet processing function 102-1 of the second control unit 101-2 are in an inactivated state (non-operating state). ). In FIG. 7, the processing of the packet processing function 102-i and the communication quality measurement function 103-i (i = 1, 2) is performed by the apparatus 100 or the control unit 101-i (i = 1, 2). You may make it implement | achieve with the program run with the computer which comprises.

  In one form of the present invention, the communication quality monitoring device is composed of a gateway that forms a relay device on a user plane (U-plane) such as MGW, AGW, and the other control unit has a predetermined existing function of the gateway. The communication quality may be measured on the basis of the copy packet.

  In one form of the present invention, the first control unit 101-1 takes a copy of the packet received from the network, rewrites the destination and port number of the copy packet, and then sends it to the second control unit 101-2. It is good also as a structure which transmits.

In an embodiment of the present invention, the second control unit 101-2 is based on the copy packet,
Error detection by comparison between transmission data and reception data in the transparent transfer mode in the first control unit 101-1;
A check of the processing time in the first control unit 101-1,
Error detection based on error detection information of headers of copy packets of the transmission packet and the reception packet;
・ Check for packet loss,
・ Checking packet jitter,
・ Decoding processing of transmission data and reception data,
It is good also as a structure which performs at least 1 of these.

  The above-described relay device on the user plane (U-plane) such as MGW or AGW is generally designed with a margin for traffic. Also, functions necessary for monitoring communication quality are provided as existing functions in the MGW and AGW. As a function necessary for monitoring the communication quality, for example, the communication quality may be measured by utilizing a resource having a margin. In this way, communication quality can be measured and monitored without the need to install a new communication quality monitoring device. A relay device on a user plane (U-plane) such as MGW or AGW terminates a packet received from the network, performs codec conversion or transparent transfer, and again transmits a control unit (for example, a VoIP control unit) to the network. There are several. Of the multiple control units, one control unit copies the call quality monitoring packet, sends the copied packet to the other control unit, and the other control unit measures the communication quality based on the copy packet. To do. According to the present invention, call quality can be monitored without installing a dedicated device such as the communication quality measuring device 24 of FIG. 6 in the network. Hereinafter, embodiments will be described with reference to the drawings.

<Embodiment>
FIG. 1 is a diagram schematically illustrating an example of a system configuration according to an embodiment of the present invention. In FIG. 1, the MGW 10 is shown as a relay device that relays (routes) a packet. A voice packet input from the portable terminal 2 to the MGW 10 is transferred from the portable terminal 2 to an IP network via a radio access network (Radio Access Network) (not shown), and represents a voice packet input to the MGW 10. Yes. The MGW 10 relays (routes) the input voice packet and outputs it to an IP network (not shown). In FIG. 1, the transfer path of the relayed packet is indicated by a solid arrow. As shown in FIG. 1, the MGW 10 is connected to the maintenance terminals 1a and 1b via a predetermined interface. In FIG. 1, it goes without saying that the number of maintenance terminals is not limited to two. The maintenance terminals 1a and 1b may be the same terminal.

  In the MGW 10 of FIG. 1, the VoIP control units # 1, # 2 (11, 12) terminate RTP packets received from an IP network (not shown) and perform codec transcoding, or perform transparent transfer ( transparent transfer) and send again with RTP. The VoIP controllers # 1 and # 2 (11, 12) have the same configuration, and each measures a voice data processing function (not shown) that performs processing such as codec conversion and transparent transfer of voice data, and call quality. At least a communication quality measurement function (not shown) is provided. Note that a plurality of VoIP control units are mounted according to the number of RTP sessions processed by the MGW 10 (in FIG. 1, two VoIP control units # 1 and # 2 are shown for simplicity of explanation). )

  An RTP session can be said to be a general term for multimedia senders and receivers and the flow of multimedia data, for example. For identification of a session, for example, a network address, a set of ports for transmitting data, and a set of ports for receiving data are used. The session is established by, for example, SIP (Session Initiation Protocol). SIP controls session start, change, end, and the like. For SIP, for example, refer to IETF (Internet Engendering Task Force) RFC (Request For Comments) 3261). A session established by SIP is described by SDP (Session Description Protocol). The SDP session description includes the session name, session active time, media constituting the session, and information (address, port, format, etc.) necessary to receive the media (for example, IETF RFC 4566 for SDP). Is referenced). After the session is established by SIP, RTP takes over the information to switch to session management by RTP.

  The MGW 10 receives a communication quality measurement instruction from the maintenance terminal 1a, and notifies the maintenance terminal 1b of a communication quality analysis result.

  In FIG. 1, the VoIP control unit # 1 (11) copies the packet (communication quality monitoring target packet) flowing through the network at the packet copy points 13 and 14, and the copied packet is transferred to the VoIP control unit # 2 (12). (The transfer path is indicated by a dashed arrow). Although not particularly limited, in FIG. 1, in the VoIP control unit # 1 (11), the packet copy points 13 and 14 are used as an input end and an output end of a voice packet. The VoIP control unit # 2 (12) receives the copy packet transmitted from the VoIP control unit # 1 (11) and measures the call quality.

  According to the present embodiment, by using the communication quality measurement function of the VoIP control unit # 2 (12), call quality measurement / monitoring can be performed without installing a dedicated probe device or quality measurement device in the network. Is possible. In FIG. 1, signal termination with the maintenance terminals 1a and 1b is performed by, for example, an MGCF (not shown), and the quality measurement is performed by the VoIP control unit in the MGW through the control of the MGW 10 by the MGCF. Good.

FIG. 2 is a diagram schematically illustrating the configuration of the VoIP control units # 1, # 2 (11, 12) in FIG. Referring to FIG. 2, the VoIP control unit # 1 (11)
A physical layer (PHY) 116 that terminates Ethernet (registered trademark);
A MAC termination unit 115 that terminates MAC (Media Access Control);
A switch (SW) 114 that distributes normal packets (reception and transmission packets) on U-plane and packets for monitoring call quality (reception packets and transmission packets). A packet processing unit 112 positioned in front of the audio data processing unit 111 to copy a packet;
A voice data processing unit 111 that performs processing of voice data that is RTP payload data (RTP payload) such as codec conversion of voice data and transparent transfer of voice packets, and a communication quality measurement unit 113 are provided. The VoIP control unit # 2 (12) has the same configuration.

  The communication quality measurement unit 123 of the VoIP control unit # 2 (12) receives from the VoIP control unit # 1 (11) a copy packet obtained by copying the received packet and the transmission packet by the packet processing unit 112 in the VoIP control unit # 1 (11). Based on the received copy packet, for example, the communication quality is measured using at least one function of the following processes (a) to (f).

(A) a comparison function between the voice data in the RTP payload portion of the transmission packet and the voice data in the RTP payload portion of the reception packet in the transparent transfer mode;
(B) Processing time check function in the VoIP control unit,
(C) Check function for bit corruption in transmission packet and reception packet (check sum field check in packet header),
(D) Packet loss check function,
(E) Packet jitter check function,
(F) Decoding function of transmission voice data and reception voice data.

  Here, the decoding function performs codec conversion using free resources in the audio data processing unit 111, and enables audio reproduction and audio quality confirmation on the maintenance terminal (for example, 1b in FIG. 1) side.

  In the present embodiment, it is possible to measure communication quality using a VoIP control unit that is a part of components (resources) of a normal MGW. Hereinafter, an outline of the communication quality measurement will be described below.

  In FIG. 2, for a voice packet transmitted from the mobile terminal 2 in the network and relayed by the VoIP control unit # 1 (11) in the MGW 10, a maintenance person (not shown) communicates about the voice packet of the mobile terminal 2. When measuring quality, necessary information (for example, target session information, communication quality measurement monitoring device information, communication quality measurement start instruction, etc.) is set from the maintenance terminal (for example, 1a in FIG. 1) to the MGW 10.

  For identifying the session of the target session information, for example, a network address, a set of ports that transmit data, a set of ports that receive data, and the like are used.

  The communication quality measurement monitoring device information is information for specifying a monitoring device that measures the communication quality.

  The communication quality measurement start instruction instructs the MGW 10 to start communication quality measurement.

  Based on the communication quality measurement monitoring device information set from the maintenance terminal (1a in FIG. 1), in the MGW 10, the VoIP control unit # 2 (12) uses the communication quality based on the copy packet from the VoIP control unit # 1 (11). Set to measure.

  Based on the communication quality measurement start instruction set from the maintenance terminal (1a in FIG. 1), a copy of the packet (voice packet) corresponding to the target session set from the maintenance terminal (1a in FIG. 1) is transferred to the VoIP control unit # 1. The packet copied in (11) is transmitted to the VoIP control unit 12 (in the same apparatus in FIG. 1), and the VoIP control unit # 2 (12) instructs the start of measurement of the communication quality of the copy packet. In FIG. 2, the VoIP control unit 11 transmits a copy packet to the VoIP control unit 12 via the IP network 3, but the VoIP control units 11 and 12 are disposed in the same apparatus. The VoIP control unit 11 may directly input the copy packet to the VoIP control unit 12.

  The communication quality measurement unit 123 of the VoIP control unit # 2 (12) performs communication quality measurement using the copy packet information. The communication quality measurement unit 123 of the VoIP control unit 12 transmits the measurement result of the communication quality based on the measured information to the maintenance terminal (1b in FIG. 1).

 Note that the communication quality measurement monitoring by the VoIP control unit of the MGW 10 may be terminated by an instruction from the maintenance terminal (1a in FIG. 1). Alternatively, when the number of packets measured by the communication quality measurement unit 123 of the VoIP control unit # 2 (12) reaches a predetermined number, or when measurement is performed for a predetermined period, The communication quality measurement process may be terminated, and the communication quality measurement result (or the communication quality measurement data analysis result) may be transmitted to the maintenance terminal (1b in FIG. 1).

  Next, the operation of this embodiment will be described in detail with reference to FIGS. 2, 3, 4, and 5. FIG. 4 is a flowchart for explaining the operation of communication quality measurement monitoring in one embodiment of the present invention.

When the maintenance staff starts measurement (monitoring) of communication quality, an instruction to start communication quality measurement is sent from the maintenance terminal (1a in FIG. 1) to the MGW 10.
・ Communication quality monitoring target session information,
・ Communication quality measurement monitoring device information (destination address of copy packet)
(S1).

  From the communication quality monitoring target session information notified to the MGW 10 from the maintenance terminal (1a in FIG. 1), the session controlled by the VoIP control unit # 1 (11) is set as the communication quality monitoring target. The address of the VoIP control unit # 2 (12) is set as the destination address of the copy packet.

  Upon receiving an instruction from the maintenance terminal (1a in FIG. 1), the packet processing unit 112 of the VoIP control unit # 1 (11) copies the received packet and the transmitted packet (S2). At that time, in the packet processing unit 112, from the predetermined header field information (network address, port information, etc.) of the received packet and the transmitted packet, the packet is the communication quality monitoring target set by the maintenance terminal (1a in FIG. 1). It is possible to determine whether or not the packet is a session packet and copy the packet of the session of the communication quality monitoring target.

  The packet processing unit 112 includes a destination IP address (Destination IP Address) (see FIG. 5) and a destination UDP port number (Destination UDP Port No) (see FIG. 5) in the header of the copy packet copied as a communication quality monitoring target packet. Is set based on the communication quality measurement monitoring device information notified from the maintenance terminal (1a in FIG. 1), and is sent to the switch 114. In the header format shown in FIG. 5, a packet field (destination IP address of IP header, destination UDP port number of UDP header) surrounded by a broken line is a field set in the copy packet after packet copy by packet processing unit 112.

  The switch 114 sorts the copy packet (communication quality measurement packet) and transmits it to the VoIP control unit # 2 (12) via the MAC termination unit 115 and the PHY 116 (S3).

  The copy packet passes through the path indicated by the broken line in FIG. 2, and is distributed to the communication quality measurement unit 123 as a communication quality measurement packet by the switch (SW) 124 of the VoIP control unit 12.

  The communication quality measuring unit 123 measures the communication quality using the copy packet transferred from the VoIP control unit 11 (S4). Although not particularly limited, the communication quality measurement unit 123 performs the following analysis, for example. In the header format shown in FIG. 5, packet field information (checksum of UDP header, sequence number of RTP header, time stamp, RTP payload) enclosed in bold solid lines is the communication Referenced by the quality measuring unit 123.

(A) In the voice data quality measurement in the transparent transfer mode, VoIP control is performed by comparing whether the copy of the received packet in FIG. 2 matches the payload portion (voice data portion) of the copy of the transmitted packet in FIG. Analyzes whether or not communication quality deterioration due to bit corruption occurs in the device.

(B) As shown in FIG. 3, the time difference when the copy (1) of the received packet and the copy (2) of the transmitted packet are received by the communication quality measuring unit 123 of the VoIP control unit 12 is calculated, and the VoIP control unit The processing delay at 11 is measured. Most of the processing delay that occurs in the VoIP control unit 11 occurs in the audio data processing unit 111.

(C) Referring to the checksum (Checksum) (FIG. 5) of the UDP header of the copy packet, check for bit corruption in the transmission packet and the reception packet, and analyze the occurrence frequency.

(D) With reference to the sequence number (Sequence Number) (FIG. 5) of the RTP header of the copy packet, the number of occurrences of packet loss and the occurrence frequency per unit time are analyzed from the skip of the number.

(E) Jitter is analyzed based on the time stamp (Time Stamp) information (FIG. 5) of the RTP header of the copy packet and the arrival interval of the communication quality measuring unit 123 of the VoIP control unit 12 of the copy packet.

(F) In the codec conversion mode, the copy packet is decoded (decoded) by using the free resource of the audio data processing unit 111, and the application on the maintenance terminal (1b in FIG. 1) performs audio reproduction and audio quality confirmation. Enable analysis. By notifying these analysis results and voice data to the maintenance terminal (1b in FIG. 1), the maintenance staff can measure (check) the communication quality at the maintenance terminal (1b in FIG. 1). In this case, the quality measuring device 24 of FIG. 6 is unnecessary.

  In this embodiment, communication quality is monitored by using existing resources such as MGW. The VoIP control unit 11 that accommodates a communication quality monitoring target session and the VoIP control unit 12 that functions as a communication quality measurement monitoring device do not necessarily have to be in the same MGW 10. In order to suppress as much as possible the quality influence of the network (IP network) through transfer of the copy packet between the VoIP control units, it is preferable to use the VoIP control unit in the same MGW 10.

  According to this embodiment, there exist the following effects.

  Communication quality can be measured without arranging a probe device between the MGW and the network. For this reason, the construction of connecting the probe device to the network and the management of the probe device and the quality measuring device are unnecessary. As a result, maintenance man-hours can be reduced.

  For monitoring the communication quality, it is possible to monitor the communication quality by measuring the communication quality by effectively utilizing the existing functions and resources in the MGW and AGW without adding a new device. Even if changes are required to implement the specifications described with reference to FIG. 2 and FIG. 3, etc., for existing functions in relay devices such as MGW and AGW, the functions will not be significantly changed. Fits in a few changes and corrections. As a result, it is expected to reduce capital investment.

  It is not necessary to connect a probe device or the like to the network, and the device (element) on the network can be simplified. For this reason, the division of the physical layer of the network can be reduced. As a result, in a system having a redundant configuration, it is possible to quickly detect a network failure on the node side (MGW) (because it is possible to detect a failure in the physical layer instead of monitoring in an upper layer), and the active system When a failure occurs, the system can be quickly switched to the standby system. As a result, the redundant configuration (N + 1 redundancy) can be increased (N is increased).

  In the above embodiment, the description has been given of the example of the relay device that receives the voice packet from the IP network and transmits the received voice packet to the IP network. However, the present invention is limited to application to the relay device. Of course, the present invention can be applied as an apparatus for measuring communication quality by capturing packets during communication flowing through a network.

  It should be noted that the disclosures of the above patent documents are incorporated herein by reference. Within the scope of the entire disclosure (including claims) of the present invention, the embodiments and examples can be changed and adjusted based on the basic technical concept. Various combinations or selections of various disclosed elements (including each element of each claim, each element of each embodiment, each element of each drawing, etc.) are possible within the scope of the claims of the present invention. . That is, the present invention of course includes various variations and modifications that could be made by those skilled in the art according to the entire disclosure including the claims and the technical idea.

1a, 1b Maintenance terminal 2 Mobile terminal 3 IP network 10 MGW
11 VoIP control unit # 1
12 VoIP control unit # 2
13, 14 Packet copy point 21 MGW
22 IP network 23 Probe device 24 Quality measuring device 100 Communication quality monitoring device 101, 101-1, 101-2 Control unit 102, 102-1, 102-2 Packet processing function 103, 103-1, 103-2 Communication quality measurement Functions 111, 121 Audio data processing unit 112, 122 Packet processing unit 113, 123 Communication quality measurement unit 114, 124 Switch (SW)
115, 125 MAC terminator 116, 126 Physical layer (PHY)

Claims (10)

A plurality of control units having a function of receiving a packet from the network and transmitting the packet to the network, and a function of measuring communication quality from the packet information,
In one control unit, the received packet and / or the packet to be transmitted are copied and the copied packet is transmitted to the other control unit.
The communication quality monitoring apparatus, wherein the other control unit measures communication quality using a copy packet transmitted from the one control unit. In the communication quality monitoring apparatus according to claim 1,
The communication quality monitoring device comprises a gateway that forms a relay device on the user plane,
The communication quality monitoring apparatus, wherein the other control unit measures communication quality based on the copy packet using a predetermined existing function of the gateway.   3. The one control unit takes a copy of a packet received from the network, rewrites the destination and port number of the copy packet, and transmits the copy packet to the other control unit. The communication quality monitoring device described. The other control unit is based on the copy packet,
Error detection by comparison of transmission data and reception data in the transparent transfer mode in the one control unit,
Checking the processing time in the one control unit;
Error detection based on error detection information of a header of a copy packet of the transmission packet and the reception packet,
Check for packet loss,
Packet jitter check,
Decoding processing of transmission data and reception data,
The communication quality monitoring apparatus according to claim 1, wherein at least one of the following is performed. The communication quality monitoring device of claim 1 is provided.
The communication quality monitoring system, wherein the one control unit and the other control unit are configured as different devices and connected via a network. Of a plurality of control units having a function of receiving a packet from the network and transmitting the packet to the network and a function of measuring communication quality from the packet information, the received packet and / or transmission in one control unit Copy the packet to be sent and send the copied packet to the other control unit,
The communication quality monitoring method, wherein the other control unit measures the communication quality using the copy packet transmitted from the one control unit. The communication quality monitoring method according to claim 6 is executed by a gateway that forms a relay device on a user plane,
The communication quality monitoring method, wherein the other control unit measures a communication quality based on the copy packet by using a predetermined existing function of the gateway.   8. The one control unit takes a copy of a packet received from the network, rewrites the destination and port number of the copy packet, and transmits the copy packet to the other control unit. The communication quality monitoring method described. The other control unit is based on the copy packet,
Error detection by comparison of transmission data and reception data in the transparent transfer mode in the one control unit,
Checking the processing time in the one control unit;
Error detection based on error detection information of a header of a copy packet of the transmission packet and the reception packet,
Check for packet loss,
Packet jitter check,
Decoding processing of transmission data and reception data,
The communication quality monitoring method according to claim 6, wherein at least one of the following is performed. A computer that constitutes a communication quality monitoring apparatus comprising a plurality of control units having a function of receiving a packet from a network and transmitting the packet to the network, and a function of measuring communication quality from packet information,
A process of one control unit that copies a received packet and / or a packet to be transmitted and copies the packet to another control unit;
Processing of the other control unit that measures communication quality using a copy packet transmitted from the one control unit;
A program that executes

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