JP2009219075A - Communication quality monitor system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To guarantee an End-to-End communication quality in an IP network. <P>SOLUTION: With respect to a traffic received by an STB 11 in a user's house 10, the STB 11 measures a packet loss and packet jitter and redirects results thereof to a content server 16 that is a distribution source. Otherwise, an RTT is calculated on a side of the content server 16 using an RTCP redirected from the STB 11. The content server 16 determines a trace route to the STB 11, transmits to and stores in a user quality management database 18 network quality information indicating packet loss occurrence, packet jitter abnormality and RTT abnormality and trace route information, A network management server 15 refers to the user quality management database 18 to control a band control function of a network node 14 indicated by the trace route information, thereby improving the End-to-End video distribution quality over UNI/SNI. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a communication quality monitoring system, and more particularly to a communication quality monitoring system that ensures End-To-End communication quality in an IP (Internet Protocol) network.

When video is distributed from the content distribution server, the conventional Internet service transmits the video via a best effort IP network, and thus there is a limit to the quality that can be transmitted. The routers that make up an IP network often have a bandwidth control function. However, the system operation that detects quality degradation, corrects it at the network level using the bandwidth control function, and improves the service quality is realized. The reality is that it has not been done. In the future, it is assumed that high-definition video distribution will progress due to the fusion of NGN communications and broadcasting. However, it is a big issue how to secure the quality in particular.
In such a situation, for example, a policy rule optimizing method and apparatus for optimizing a network policy by measuring quality degradation by a method such as traffic measurement and applying feedback to a network management server is disclosed. (For example, refer to Patent Document 1).
JP-A-2005-354280

However, since there is no means for grasping the quality on the terminal side in the above-described method, the quality at End-To-End cannot be guaranteed.
In addition, in the current network service, quality degradation is measured by End-To-End across UNI (User Network Interface, User Network Interface) and SNI (Server Network Interface, Server Network Interface), and across UNI / SNI. There was no way to guarantee network quality by providing feedback. This is because, in the network service boundary conditions in UNI / SNI, the in-house set-top box (hereinafter referred to as STB) is responsible for the user, from the interface with the content server to the ONU (Optical Network Unit), for example, the communication carrier responsibility, It is presumed that ISP (Internet Service Provider) responsibility is defined and the in-home devices are liberalized by disclosing UNI / SNI interface specifications. In contrast to the time when network services that can almost guarantee the communication service level for users if the UNI interface conditions are strictly defined as in normal telephone services, the current video distribution service has high real-time performance. The traffic conditions have changed to that the traffic is not completely uniform but bursty, and that it is difficult to buffer because the traffic volume is large compared to voice, etc., and the quality is defined uniformly by UNI / SNI. Is getting harder.

For example, in a system in which a band of 1 Gbps is divided into 32 and connected to an STB, when a plurality of STBs or terminals connected to the STB receive the same broadcast, burst timing may overlap, and the service level decreases. There is.
Therefore, the quality assurance is such that the service quality is measured with the end-to-end across the UNI / SNI while the user is actually receiving the service, and the service level is guaranteed by feeding it back to the network or content server. Realization of the system was requested.

  In view of the above, the present invention provides a communication quality monitoring system capable of guaranteeing network quality by measuring quality degradation at End-To-End and applying feedback across UNI / SNI. The purpose is to do. Accordingly, an object of the present invention is to provide a communication quality monitoring system capable of providing a user with a high-quality video distribution service.

  Another object of the present invention is to provide a means for a communication carrier that controls a band to appropriately collect a charge from a user for realizing services across users, communication carriers, and ISPs. And The present invention has one of the purposes that a communication carrier collects a charge as a price for a quality assurance service in End-To-End by combining with a lease fee of STB or a high-quality delivery notification service of ISP, for example. To do.

In order to solve the above-described problems, in the present invention, packet loss, packet jitter, and round trip time (RTT) are measured with respect to the traffic received by the STB at the user's home by the quality feedback function built in the STB. Is returned to the content server that is the distribution source. The content server notifies the network quality information to the network management server (hereinafter referred to as NW management server) or the user quality management database. The NW management server controls the router bandwidth control function of the communication carrier with reference to the user quality management database as necessary, and improves the distribution quality of video and the like.
In this case, one of the most important issues is how to collect charges for communication carriers. The communication carrier clearly separates the responsibility disaggregation points with the user at the UNI, and can charge only for the communication quality defined by the UNI. However, the exchange until the quality degradation at End-To-End is measured and returned to the content server is performed between the home STB and the content server, and it is difficult to incorporate the procedure into the interface specification in the UNI. Further, the router bandwidth control performed by the communication carrier is control closed within the network, and cannot be defined in the UNI.

  Therefore, in the present invention, the charge collection method included in the lease fee of the STB with the quality feedback function is used as the first means of the payment method for the communication carrier for the quality assurance service in End-To-End. Further, as a second means, the ISP collects from the user as a high-quality distribution notification service, and the communication carrier receives the router bandwidth control cost from the ISP. If these means are used, the communication carrier can collect a price for the quality assurance service in addition to the uniform UNI regulations, and the above-mentioned problems can be solved.

According to the first solution of the present invention,
A network node having a bandwidth control function and constituting a network;
A quality management database in which information for controlling the bandwidth control function of the network node is stored;
A set-top box communicating with the network via a user network interface;
A content distribution server that communicates with the network via a server network interface and transmits packets including content data to the set top box via the network;
The content distribution server transmits the packet including a packet sequence number to the set-top box via the network,
When the set top box detects a packet loss according to the sequence number of the received packet, the quality between the set top box and the content distribution server across the user network interface and the server network interface is sent to the content distribution server. Notify the failure,
The content distribution server obtains route information indicating the network node through which content data from the content distribution server to the set top box passes,
The content distribution server transmits the requested route information and quality information indicating the occurrence of packet loss to the quality management database,
A communication quality monitoring system for storing route information and quality information in the quality management database is provided.

According to the second solution of the present invention,
A network node having a bandwidth control function and constituting a network;
A quality management database in which information for controlling the bandwidth control function of the network node is stored;
A set-top box communicating with the network via a user network interface;
A content distribution server that communicates with the network via a server network interface and transmits packets including content data to the set top box via the network;
The content distribution server transmits a packet including a time stamp to the set top box via the network.
The set-top box, when the packet jitter obtained according to the time stamp of the received packet exceeds a predetermined standard, causes the content distribution server to straddle the user network interface and the server network interface. Notifying the quality failure between the set top box and the content distribution server,
The content distribution server obtains route information indicating the network node through which content data from the content distribution server to the set top box passes,
The content distribution server transmits the requested route information and quality information indicating packet jitter abnormality to the quality management database,
A communication quality monitoring system for storing route information and quality information in the quality management database is provided.

According to the third solution of the present invention,
A network node having a bandwidth control function and constituting a network;
A quality management database in which information for controlling the bandwidth control function of the network node is stored;
A set-top box communicating with the network via a user network interface;
A content distribution server that communicates with the network via a server network interface and transmits packets including content data to the set top box via the network;
The content distribution server transmits and receives a control packet to and from the set top box, measures a round trip time between the content distribution server and the set top box,
The content distribution server, when the measured round trip time is greater than a predetermined allowable time, obtains route information indicating the network node through which content data from the content distribution server to the set top box passes, Send the requested route information and quality information indicating the round trip time abnormality to the quality management database,
A communication quality monitoring system for storing route information and quality information in the quality management database is provided.

According to the above solution, it is possible to guarantee the quality of the network by measuring quality degradation at End-To-End and applying feedback across UNI / SNI. It is also possible to provide a high-quality video distribution service to the user.
In the communication quality monitoring system,
In the quality management database, an operator who manages or operates the network receives a lease fee for the set top box or a service fee for quality assurance service from a user who uses the set top box, or A flag indicating that a lease or service contract is made is stored corresponding to the identification information for identifying the set top box,
The management server displays or outputs the instruction for controlling the bandwidth control function of the network node or improving the communication quality with respect to a quality failure with respect to the set top box for which the flag is valid.
In the communication quality monitoring system,
In the quality management database, a company that manages or operates the content distribution server receives a service fee of a quality assurance service from a user who uses the set-top box, or makes a service contract with the user. A flag indicating that the set-top box is stored is stored corresponding to the identification information for identifying the set-top box,
The management server displays or outputs the instruction for controlling the bandwidth control function of the network node or improving the communication quality with respect to a quality failure with respect to the set top box for which the flag is valid.

  As a result, the service is realized across the user, the communication carrier, and the ISP (Internet Service Provider), whereas the communication carrier that controls the bandwidth can appropriately collect the charge from the user. Further, for example, by combining with a lease fee of STB or a high-quality delivery notification service of ISP, a communication carrier can collect a fee as a price for a quality assurance service in End-To-End.

ADVANTAGE OF THE INVENTION According to this invention, the communication quality monitoring system which can guarantee the quality of a network by measuring the quality degradation in End-To-End and giving feedback across UNI / SNI can be provided. Thereby, according to this invention, the communication quality monitoring system which can provide a user with a high quality video delivery service can be provided.
Furthermore, according to the present invention, a service can be provided across users, communication carriers, and ISPs, and a communication carrier that controls the bandwidth can provide means for appropriately collecting the charges from the users. According to the present invention, for example, by combining with a lease fee of STB or a high-quality distribution notification service of ISP, a communication carrier can collect a fee as a price for a quality assurance service in End-To-End.
According to the present invention, a quality assurance type distribution service and a quality assurance system can be provided.

FIG. 1 is a diagram illustrating a configuration example of a communication quality monitoring system.
The communication quality monitoring system (quality assurance system) includes, for example, a home STB 11, one or a plurality of IP network nodes 14, a network management server 15, a content distribution server 17, and a user quality management database 18.
The user of the end user home 10 selects the content to be viewed according to the menu of the content display device 12 and issues a content delivery request to the content delivery server 17 via the home STB 11 and the IP network 13. Based on the request from the end user, the content distribution server 17 distributes the content using, for example, an RTP (Realtime Transfer Protocol) packet. The content is stored in advance in the content distribution server 17 or in an appropriate database. The distributed content is displayed on the content display device 12 via the IP network 13 and the home STB 11.

  When the in-house STB 11 receives the RTP packet and detects packet loss and packet jitter, the in-home STB 11 returns a quality result (packet loss occurrence, packet jitter abnormality) to the content distribution server 17 using an RTCP (Real Time Control Protocol) packet. The content distribution server 17 calculates the RTT based on the RTCP packet transmitted by itself and the RTCP returned from the in-house STB 11. The content distribution server 17 determines a quality failure (excessive round trip time) based on the RTT calculated by itself. The content distribution server 17 notifies the user quality management database 18 of network quality information when there is a packet loss, packet jitter abnormality, or RTT abnormality received from the home STB 11. Note that the content distribution server 17 may transmit network quality information to the network management server 15.

The STB 11 communicates with the network via, for example, the UNI. The residential STB 11 has, for example, an RTP reception function, a quality monitoring function, and a quality notification function. The IP network node 14 has a bandwidth control function and constitutes an IP network. The content distribution server 17 has an RTP packet transmission function, communicates with the network via the SNI, and transmits content data to the STB 11 via the network. The quality management database 18 stores information for controlling the bandwidth control function of the IP network node 14. Details will be described later.
The network management server 15 controls the bandwidth control function of the IP network node 14 indicated by the route information in accordance with the information in the quality management database 18 to improve the communication quality between the STB 11 and the content distribution server 17 across the UNI and SNI. Let The network management server 15 may display or output an instruction for improving the communication quality of the route from the content distribution server 17 to the STB 11 according to the information in the quality management database 18.

  The in-home STB 11 leases, for example, a communication carrier to an end user and collects a quality assurance service fee as a lease fee. Since quality monitoring is performed between the user-responsible in-house STB 11 and the ISP-responsible content distribution server 17, it is assumed that it is difficult for the communication carrier to collect from the user as a network service fee with UNI as a boundary condition. It is. Alternatively, the ISP may collect a fee from the user as a high-quality distribution notification service, and the communication carrier may receive the router bandwidth control cost from the ISP.

FIG. 2 shows the RTP packet format.
RTP packets are implemented on top of UDP packets. The RTP packet includes, for example, an IP header, a UDP header, an RTP header, and code data. The RTP header includes, for example, version (V), padding (P), extension header (X), number of CSRC identifiers (CC), marker (M), payload type (PT), sequence number, and the like. , A time stamp, and a synchronous transmission source (SSRC) identifier.
The RTP header is provided with a sequence number, and packet loss can be detected by checking this on the receiver side (STB 11). The STB 11 can detect packet jitter based on the time stamp information of the received packet. For example, the STB 11 checks the sequence number of each received packet and detects the occurrence of a packet loss if there is a missing number.

  Version (V) indicates the version number of RTP. Padding (P) indicates the presence or absence of padding data. The extension header (X) indicates the presence or absence of the extension header. The number of CSRC identifiers (CC) indicates the number of CSRC identifiers. The usage of the marker (M) is defined for each payload type. The payload type (PT) indicates the type of code data to be transmitted. The initial value of the sequence number is a random number, for example, and is incremented by 1 for each packet. The time stamp represents the time when the oldest data included in the packet occurs. The time stamp may be an appropriate time related to data in the packet, an appropriate time related to packet transmission / reception, or the like. The synchronous transmission source (SSRC) identifier is an identifier for identifying the transmission source of the RTP packet.

FIG. 3 shows the RTCP packet format.
The RTCP packet is an RTP control protocol. RTCP RR (Receiver Report) is used to convey information related to reception quality at the receiver (here, STB 11) to the sender (here, the content distribution server 17).
The RTCP packet includes, for example, version (V), padding (P), count, packet type, packet length, and type-specific information (padding). Version (V) indicates a version number of RTCP. Padding (P) indicates the presence or absence of padding data. The count indicates the number of items included in the packet depending on the type of packet. The packet type indicates an RTCP packet type. For example, “200” is entered for RTCP SR (Sender Report), and “201” is entered for RTCP RR. The packet length indicates the packet length excluding the header. As for the type-specific information (padding), the usage is defined for each packet type.

FIG. 9 shows a database structure example of the user quality management database 18.
The user quality management database 18 includes, for example, a user ID 91 of a user who uses the STB 11, an IP address 92 of the STB 11, a high quality flag 93, quality information 94, and trace route information (path information) 95. Remembered. The quality information 94 can include information indicating packet loss abnormality, packet jitter abnormality, and RTT abnormality.
Since the network management server 15 controls the IP network node 14 of the communication carrier, it may be a security problem to communicate directly with the ISP. As in this embodiment, the network management server 15 and the ISP store information. The user quality management database 18 for delivery may be installed independently. In the user quality management database 18, 1 is set in the high quality flag for the target user of the high quality service performing the processing of the present embodiment, and 0 is set if the user is not the user performing the processing of the present embodiment. ing. When the ISP detects a packet loss, jitter abnormality, or RTT abnormality for the corresponding user, the ISP confirms the trace route from the ISP to the STB 11, and enters the quality information and the trace route information in the database. Based on the quality information and the trace route information, the network management server 15 performs bandwidth control (for example, router bandwidth control and line expansion) necessary for quality improvement.

FIG. 4 shows a packet loss monitoring sequence.
First, the content distribution server 17 transmits an RTP packet including the sequence number of the packet to the STB 11 via the network (S401 to S405). For example, the RTP packet includes content data. The RTP packet can be transmitted at a predetermined transmission interval, for example.
The STB 11 detects the presence or absence of packet loss according to the sequence number of the received packet (S407). Step S403 in FIG. 4 shows a case where a packet transmitted from the content distribution server 17 is lost. When the packet loss is detected, the STB 11 notifies the content distribution server 17 of a quality failure between the STB 11 and the content distribution server 17 across the UNI and SNI, for example, by an RTCP RR packet (S409).

Further, the content distribution server 17 obtains a trace route (route information) from the content distribution server 17 to the STB 11 (S411). The trace route can be obtained by a predetermined protocol. The route information indicates, for example, the IP network node 14 through which the content data passes. The content distribution server 17 transmits the obtained route information and quality information indicating the occurrence of packet loss to the quality management database 18 (S413).
The quality management database 18 stores route information and quality information transmitted from the content distribution server 17. For example, the network management server 15 refers to the route information and quality information in the quality management database 18 (S415), controls the bandwidth control function of the network node 14 indicated by the route information, and crosses the UNI and SNI. The communication quality and video distribution quality between the STB 11 and the content distribution server 17 are improved (S417).

FIG. 5 is a packet jitter monitoring sequence.
In this sequence, when a packet jitter abnormality is detected on the STB 11 side based on the time stamp information of the RTP packet transmitted from the content distribution server 17, information regarding the quality of the content distribution server 17 is transmitted by the RTCP RR packet. Notify The content distribution server 17 notifies the network quality information to the user quality management database 18, and the network management server 15 refers to the user quality management database 18 to control the router bandwidth control function of the communication carrier to improve the video distribution quality. .

Hereinafter, each step will be described.
First, the content distribution server 17 transmits a packet including a time stamp to the STB 11 via the network (S501 to S505). For example, the RTP packet includes content data. The RTP packet can be transmitted at a predetermined transmission interval, for example.

The STB 11 measures packet jitter according to the time stamp of the received content data (S507). If the packet jitter exceeds a predetermined standard, the content delivery server 17 is notified of a quality failure between the STB 11 and the content delivery server 17 across the UNI and SNI, for example, by an RTCP RR packet (S509). .
The content distribution server 17 obtains a trace route (route information) indicating the IP network node 14 through which the content data from the content distribution server 17 to the STB 11 passes (S511). The content distribution server 17 transmits the obtained route information and quality information indicating packet jitter abnormality to the quality management database 18 (S513).
The quality management database 18 stores route information and quality information transmitted from the content distribution server 17. For example, the network management server 15 refers to the route information and quality information in the quality management database 18 (S515), controls the bandwidth control function of the network node 14 indicated by the route information, and crosses the UNI and SNI. The communication quality and video distribution quality between the STB 11 and the content distribution server 17 are improved (S517).

FIG. 6 shows an RTT monitoring sequence.
When the content distribution server 17 calculates an RTT based on the RTCP SR transmitted by itself and the RTCP RR received from the in-house STB 11 and detects an abnormal value, the content distribution server 17 sends the network quality information to the network management server 15. The notification and network management server 15 controls the router bandwidth control function of the communication carrier as necessary to improve the video distribution quality.

FIG. 7 is an RTT calculation flowchart. Based on this calculation flow, RTT is calculated. The RTT monitoring operation will be described with reference to FIGS.
The content distribution server 17 transmits RTCP SR (first control packet) and records the transmission time (S601, S701). The STB 11 measures the time (b) from when the RTCP SR is received to when the RTCP RR (second control packet) is returned, describes it in the RTCP RR, and transmits the RTCP RR to the content distribution server 17 (S603, S703). ). The content distribution server 17 calculates the RTT based on the interval (a) between the RTCP SR transmission time and the RTCP RR reception time and the time (b) described in the received RTCP RR. For example, the content distribution server 17 calculates RTT = (a) − (b) (S605, S705).
The content distribution server 17 determines whether the RTT is longer than a predetermined allowable RTT time (S707). If the RTT is larger than the allowable RTT time (S707, Yes), the content distribution server 17 obtains a trace route (route information) indicating the IP network node 14 through which the content data from the self content distribution server 17 to the STB 11 passes (S607). ). The content distribution server 17 transmits the obtained route information and the quality information indicating the round trip time abnormality to the quality management database 18 (S609, S709). On the other hand, if the RTT is not longer than the allowable RTT time (S707, No), the process proceeds to step S711.

  The quality management database 18 stores the route information and quality information transmitted from the content distribution server 17. For example, the network management server 15 refers to the route information and quality information in the quality management database 18 (S611), controls the bandwidth control function of the network node 14 indicated by the route information, and crosses the UNI and SNI. Communication quality and video distribution quality between the STB 11 and the content distribution server 17 are improved (S613, S711).

FIG. 8 is an explanatory diagram of charge collection for a communication carrier.
First, when the communication carrier collects the charge for the quality assurance function in the lease fee of the in-home STB 11, there are the following menus and service forms of the communication carrier.
(1) A communication carrier leases an STB 11 device with a quality assurance function (STB 11 device including the processing / function of the present embodiment) and collects a monthly device usage fee for the STB 11 device. Part of this is paid to the ISP.
(2) The communication carrier collects a monthly function usage fee for the quality assurance function.
The user quality management database 18 includes a high quality flag (quality) indicating that a communication carrier (operator) managing or operating a network has received a lease fee for the STB 11 or a service fee for quality assurance service from a user using the STB 11. The service provision flag) is stored in correspondence with identification information (for example, IP address) for identifying the STB 11. Note that the high quality flag may be set effectively by making a lease or service contract, in addition to being effectively set by receiving the lease fee and service fee. The network management server 15 controls the bandwidth control function of the IP network node 14 for a quality failure with respect to the STB 11 for which the flag is valid.

When the ISP collects the charge for the quality assurance function in addition to the content distribution service, the ISP menu and service form are as follows.
(1) ISP collects the basic monthly fee for the provider. In this case, the STB 11 can use the network function provided by the ISP, for example.
(2) Collect contents distribution monthly service fee. In this case, the STB 11 can use, for example, the network function provided by the ISP and the reception of content data from the content distribution server 17.
(3) A monthly service charge is collected for the quality assurance function. Of this, a part is paid to the communication carrier. For example, a service fee is collected for the function of the present embodiment.

  In the user quality management database 18, the high quality flag indicating that the ISP that manages or operates the content distribution server 17 has received the service fee of the quality assurance service from the user who uses the STB 11 corresponds to the identification information for identifying the STB 11. Is remembered. Note that the high quality flag may be set effectively by making a service contract, in addition to being set effectively by receiving the service fee. The network management server 15 controls the bandwidth control function of the IP network node 14 for a quality failure with respect to the STB 11 for which the flag is valid.

As described above, in the present embodiment, the packet loss and the packet jitter are measured by the quality feedback function built in the STB 11 based on the end-to-end quality, and the result is sent to the content distribution server 17 that is the distribution source. Send back. Alternatively, RTT is calculated on the content distribution server 17 side by RTCP returned from the STB 11. The content distribution server 17 notifies the network quality information to the NW management server 15, and the NW management server 15 can control the router bandwidth control function of the communication carrier as necessary to improve the video distribution quality. Furthermore, it becomes possible for the communication carrier to collect a charge as a price for the quality assurance service at End-To-End.
Note that one of packet loss, packet jitter, and RTT may be obtained, or an appropriate plurality may be obtained.

  The present invention can be used, for example, in a network system that communicates across UNI and SNI.

The figure which shows the example of 1 structure of a quality assurance system. The figure which shows a RTP packet format. The figure which shows RTCP packet format. The sequence diagram which shows a packet loss monitoring sequence. The sequence diagram which shows a packet jitter monitoring sequence. The sequence diagram which shows a RTT monitoring sequence. RTT calculation flowchart. The figure which shows the charge collection menu example of a communication carrier. The figure which shows the database structural example of a user quality management database.

Explanation of symbols

10 End user home 11 Home STB
12 content display device 13 IP network 14 provided by communication carrier IP network node 15 network management server 16 ISP
17 Content server 18 User quality management database 91 User ID
92 IP address 93 High quality flag 94 Quality information 95 Trace route information

Claims (7)

A network node having a bandwidth control function and constituting a network;
A quality management database in which information for controlling the bandwidth control function of the network node is stored;
A set-top box communicating with the network via a user network interface;
A content distribution server that communicates with the network via a server network interface and transmits packets including content data to the set top box via the network;
The content distribution server transmits the packet including a packet sequence number to the set-top box via the network,
When the set top box detects a packet loss according to the sequence number of the received packet, the quality between the set top box and the content distribution server across the user network interface and the server network interface is sent to the content distribution server. Notify the failure,
The content distribution server obtains route information indicating the network node through which content data from the content distribution server to the set top box passes,
The content distribution server transmits the requested route information and quality information indicating the occurrence of packet loss to the quality management database,
A communication quality monitoring system for storing route information and quality information in the quality management database. A network node having a bandwidth control function and constituting a network;
A quality management database in which information for controlling the bandwidth control function of the network node is stored;
A set-top box communicating with the network via a user network interface;
A content distribution server that communicates with the network via a server network interface and transmits packets including content data to the set top box via the network;
The content distribution server transmits a packet including a time stamp to the set top box via the network.
The set-top box, when the packet jitter obtained according to the time stamp of the received packet exceeds a predetermined standard, causes the content distribution server to straddle the user network interface and the server network interface. Notifying the quality failure between the set top box and the content distribution server,
The content distribution server obtains route information indicating the network node through which content data from the content distribution server to the set top box passes,
The content distribution server transmits the requested route information and quality information indicating packet jitter abnormality to the quality management database,
A communication quality monitoring system for storing route information and quality information in the quality management database. A network node having a bandwidth control function and constituting a network;
A quality management database in which information for controlling the bandwidth control function of the network node is stored;
A set-top box communicating with the network via a user network interface;
A content distribution server that communicates with the network via a server network interface and transmits packets including content data to the set top box via the network;
The content distribution server transmits and receives a control packet to and from the set top box, measures a round trip time between the content distribution server and the set top box,
The content distribution server, when the measured round trip time is greater than a predetermined allowable time, obtains route information indicating the network node through which content data from the content distribution server to the set top box passes, Send the requested route information and quality information indicating the round trip time abnormality to the quality management database,
A communication quality monitoring system for storing route information and quality information in the quality management database. The set top box and the content distribution across the user network interface and the server network interface by controlling the bandwidth control function of the network node indicated by the route information according to the route information and quality information of the quality management database The communication quality monitoring system according to any one of claims 1 to 3, further comprising a management server that improves communication quality between servers. The communication quality according to any one of claims 1 to 3, further comprising: a management server that displays or outputs route information and quality information of the quality management database and instructions for improving communication quality of a route indicated by the route information. Monitoring system. In the quality management database, an operator who manages or operates the network receives a lease fee for the set top box or a service fee for quality assurance service from a user who uses the set top box, or A flag indicating that a lease or service contract is made is stored corresponding to the identification information for identifying the set top box,
The said management server displays or outputs the said instruction | indication for controlling the bandwidth control function of the said network node, or improving communication quality about the quality failure with respect to the said set top box in which this flag is effective. The communication quality monitoring system described. In the quality management database, a company that manages or operates the content distribution server receives a service fee of a quality assurance service from a user who uses the set-top box, or makes a service contract with the user. A flag indicating that the set-top box is stored is stored corresponding to the identification information identifying the set-top box,
The said management server displays or outputs the said instruction | indication for controlling the bandwidth control function of the said network node, or improving communication quality about the quality failure with respect to the said set top box in which this flag is effective. The communication quality monitoring system described.

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