JP3964751B2 - Network quality estimation control method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention provides quality control for maintaining and improving delivery quality between content servers and between content servers and user terminals in content delivery / delivery services on the Internet.TrickAbout the art.
[0002]
[Prior art]
  Internet users have beenLeapIn 2000, the number of domestic users in 2000 exceeded 20 million with only fixed terminals, and major domestic ISPs (Internet Service Providers) such as OCN and IIJTheIt has gained millions of end users [1]. For content transmitted / received on the Internet and applications to be executed, Web pages / files / mails and the like were mainly downloaded at the beginning.DaIn the case of a download-type application, there is a problem that user dissatisfaction increases due to prolonged download time when congestion occurs in the network, but the quality of the content itself is impaired by using a reliable transport such as TCP. There is nothing. Therefore, even if the content is charged, network congestion does not seriously affect the chargeability. On the other hand, in recent years, streaming live video and audio, such as delivering concert live video of major artists and prominent movies to many users, and companies promoting their own products using video.TrickBusiness using technology is becoming active. In streaming applications, the user terminal starts playback before buffering the video signal for several seconds, and before receiving all the files, absorbs variations in the arrival time of each packet on the network, and uses the buffering time. In this case, the quality is maintained by resending the lost packet. In the case of a streaming application, if the network is in a light congestion state that can maintain the quality by resending, the quality of the content itself is not impaired, but in a heavy congestion state, the reception quality of the content itself cannot be maintained. Then, it tries to continue delivery by suppressing the delivery bandwidth by rate control in the application layer. This is, for example, a difference encoding between video frames as a video encoding rule.RuleIs applied by a method such as thinning out inter-frame difference encoded data and delivering only intra-frame encoded data [2]. If the congestion state cannot be avoided, only the voice data is delivered, and the delivery band is further suppressed. As a result, the quality of the content itself received by the user is significantly impaired, and particularly when the content is charged, the business itself may be seriously affected.
  FIG. 1 shows the influence of network congestion in the case of the download application and the streaming application described above.
[0003]
  FIG. 2 shows a typical network configuration example in the current Internet connection service. An Internet connection service network is generally composed of a backbone network and an access network. The backbone network is a wide-area IP network owned by ISPs such as OCN and IIJ. If the access network is owned by the ISP itself, FLET'S provided by NTT East / West region companies. There are cases where the provider is different from ISP, such as ISDN / ADSL service. ISP is
A user management function for managing the user ID and the IP address assigned to the user,
・ Network management function to manage network system, transmission path topology information, failure / performance status of each system / transmission path,
-Server management function that holds content server ID, server IP address, failure / performance status of each server,
Etc. and manage the resources that they own.
[0004]
[Problems to be solved by the invention]
  The first problem in the case of transferring content with high real-time properties such as video streaming to the end user via the wide area IP network of FIG. 2 will be described below. The network transfers various application traffic and control traffic generated by content servers managed by the ISP itself, content servers of other ISPs, and other server operators by an autonomous routing protocol such as OSPF (Open Shortest Path First). Since the ISP cannot manage the start / end of all applications passing through its own network and the generated traffic patterns, there is a possibility that congestion may occur in each part of the network. The backbone of Tokyo 23 wards, Tokyo Osaka, etc. are connected to each system by high-speed links of Gbit / s or more, but branch lines that branch into traffic to each prefecture / city spread widely. Since the ratio of the facility cost of the branch line part to the whole becomes very large, it tries to connect with a low speed link as much as possible. The traffic generated by the content server, regardless of whether it is file transfer or video streaming, is highly bursty. Therefore, in a system with a large difference in input / output link speed, it is easy to packet depending on the amount of packet buffer and write / read performance of the system. Loss can occur. That is, in an access network where the link speed is greatly reduced, there is a high possibility that packet loss and congestion will occur due to traffic burstiness.
[0005]
  Also, when congestion occurs, the streaming application performs the above-described rate control. However, when congestion is avoided by rate control, the network management function of the ISP cannot recognize the occurrence of congestion. That is, there is a second problem that although the quality as video content is remarkably deteriorated, the congestion occurrence point on the network that is the cause cannot be evaluated.
[0006]
  Also,BaThere is a case where one operator owns the backbone network and the access network at the end-end.BaIn some cases, the backbone network is owned by an ISP company and the access network is owned by a DSL company. In the case of a content distribution / delivery service provider, in order to enclose content holders etc. with a wide area that can be delivered to a large number of end users distributed over a wide area, it is interconnected with multiple access network (DSL) providers as shown in FIG. It seems common to provide services. At this time, when viewed from the ISP, there is a third problem that it is impossible to grasp the entire resources of each access network serving as another provider, and furthermore, since the access network is shared with the other ISP, the congestion state cannot be grasped. For this reason, despite the occurrence of congestion in the access network, a new delivery request from an end user under the congestion point may be accepted, resulting in a more severe congestion state.
[0007]
  Especially in the case of real-time content such as video streaming, network congestion is directly linked to the quality degradation of the content itself as described above. There is a possibility that it will become a big barrier to the transformation.
[0008]
[Means for Solving the Problems]
  The present invention includes access networks owned by other operators.TheA method to estimate the true network quality state including application layer quality, and to navigate the user by selecting the content server that provides the best delivery quality, which regulates the delivery for new delivery requests according to the quality state, We propose advanced server access control methods.
[0009]
  The outline of the network quality estimation method according to the present invention will be described with reference to FIG.TheoryLight up. The backbone network includes a network (NW) quality estimation control function in addition to the functions shown in FIG. 2, that is, a user management function, a network management function, and a server management function.
  The NW quality estimation control function mainly holds two databases, a user state management table and an NW state management table. The user status management table holds four types of data: a user ID for each end user, a user station / system ID for identifying a station or system to which the user is connected, a user address, and a quality status. Among these data, the user ID and the user station / system ID are simultaneously input by the service manager when the user subscribes to the service, that is, when registering in the user management function, or the quality estimation control function automatically Enter in. The user management function automatically inputs the user address when the user accesses the user management function, the user management function assigns the address, and the address of the user who receives the content delivery service is registered in the database. (Flow (1)). Here, the user management function may be of any type as long as it retains the correspondence between the user ID that can uniquely identify the user who receives the content delivery service and the address to be assigned. For example, a RADIUS (Remote Authentication Dial In User Service) authentication server [3] that manages an IP address assigned to a user, a service authentication server that performs authentication as a service when providing a content delivery service, and the like are used as a user management function. be able to.
[0010]
  When the content server delivers the content to each user, the NW quality estimation control function collects the transport layer quality, application layer quality, or both of the delivery session and determines the quality status such as good, caution, and abnormality. Determine and describe in the quality status area of the user status management table (flow (2)).
  The NW quality estimation control function further estimates the status of the user station / system such as good / attention required / abnormality by summing up data of the quality state area for each user having the same user station / system ID, The result is described and held in the network status management table (flow (3)).
[0011]
  In the above-described collection of quality information, for the collection target users, information on all users who subscribe to the service is collected, sample users are selected and collected for each user station / system ID, and each user station / system ID is collected.PseudoAny method of arranging and collecting similar user terminals may be used, or a combination thereof may be used. The transport layer quality collection position may be any method such as collecting by a traffic monitor at the data center exit or collecting by a traffic monitor in the network. Further, as transport quality, packet loss, end-end delay, delay fluctuation amount, and the like are collected.
[0012]
  The application layer quality is an important parameter for grasping the quality state such as video streaming. However, it is necessary to extract the quality information monitored by the server software and the player software in the user terminal for the collection. Many commercially available player software such as Windows Media Technology, Real Networks, etc. have released SDKs that allow customization in various forms of players, and can be used to extract application layer quality [ Four]. For example, in the case of a player of Windows Media Technology, various information such as the video frame rate, reception bandwidth, number of lost / repaired packets, and reception buffer status of the player that can be confirmed on the screen during playback can be acquired. The method of determining the quality state is arbitrary, but for example, a certain threshold is set for performance information such as the amount of lost packets in the transport layer, end-end delay, delay variation, and the like, performance information such as the frame rate of the application layer and the reception buffer state For example, when one or a plurality of pieces of performance information is deteriorated below a threshold, the user's quality state is determined to be abnormal.
[0013]
  The NW state management table holds a user station / system ID and quality state data of the station / system. For this quality status, the quality status of users having the same user station / system ID on the user status management table, that is, the users accommodated in the same user station / system is totaled, and a certain number of users or a proportion of users or more Is abnormal, the user station / system ID is determined to be abnormal. By providing a plurality of threshold values, it is possible to manage the quality status of the station / user ID in detail, such as abnormality, caution, and normality.
[0014]
  FIG. 5 shows a method for estimating the network quality state by summing up the reception quality for each user in two dimensions of the transport layer and the application layer as an example of a detailed determination method of the network state. If the network load is increased little by little while a certain video streaming application is executed, it is considered that the quality state changes like a dotted curve on the two-dimensional graph in the figure. Here, assuming that, for example, rate control in the application layer is executed, the thinned-out delivery state of inter-frame difference data, the voice-only delivery state, and the like are used as indices. This is because the frame rate fluctuates greatly when the inter-frame difference data is thinned out, and the rate control state can be grasped by monitoring the frame rate. For example, when referring to quality information of only the transport layer, it is not possible to determine whether the state is a normal state or an end state of only sound. In addition, when only the application layer is referenced, there is a possibility that slight signs of deterioration may be missed, and timely quality control may not be performed.
[0015]
  From the above, in this example, the quality state of each accommodation station / system is estimated based on the quality of both the application layer and the transport layer. In FIG. 5, the application layer quality (frame rate) is also transported for many users. Area A where the layer quality is normal is normal, and the frame rate is normal for many users, but the area B where packet loss occurs is a follow-up, and frame rate fluctuations and packet loss occur for many users. The area C where the message is generated is in a state of caution, and the area D in which the transport layer quality is normal for a large number of users but the delivery of only voice is in the final state (abnormal).
  As described above, it is possible to grasp the true network state in consideration of the quality of the application layer with the accommodation station / system of the access network as a unit.
[0016]
  FIG. 6 shows an implementation example of server access control based on the network quality estimation result. It is assumed that there is a user who has already been delivered, such as user 1, and the quality estimation control function can estimate the network status of each accommodation station / system n1, n2, n3 (flow (1)). When the user 2 accesses the user management function and acquires an address (flow (2)), the address is input to the user state management table of the network quality estimation control function (flow (3)). This user address is generally assigned by user authentication or service authentication executed at the time of access. When the user 2 selects a certain content from the program guide (flow (4)), the address of the NW quality estimation control server is notified from the program guide (flow (5)). In response to this, the user 2 inquires the network status to the quality estimation control function (flow (6)), and the quality estimation control function receives the user from the source address information (user address c2) included in the inquiry. The user station / system n2 that accommodates is identified, the quality state is referred to, whether delivery is possible is determined from the quality state, and the result is notified to the user 2 (flow (7)). For example, when the user station / system is in a state of caution or abnormality, the user 2 is notified that the network cannot be delivered because the network is currently congested. If the content is normal, the address of the content server in which the content is stored, the content identifier, etc. are notified, and the user 2 sends a program viewing request to the content server using the received content server address, content identifier (flow). (8)), receive delivery of content (flow (9)).
[0017]
  Several alternatives for server access control are described below.
  When the user 2 selects content from the program guide, the program guide directly inquires the quality estimation control function of the network status, the quality estimation control function responds the estimation result to the program guide, A configuration that responds to delivery availability including the network status is also possible. As a result, the number of server accesses from the user can be reduced.
[0018]
  In addition, in the response sequence from the quality estimation control function to the user, the quality estimation control function is requested in addition to the user's caution / abnormality when the user station / system is in a state of caution / abnormality. Returns the address and content identifier of the content server in which the content is stored. The software in the user terminal that has received it is connected to the content server on a trial basis and starts reception, and when the playback state such as the storage state of the reception buffer is monitored and the threshold is not reached after a certain period of time, the content server access A method such as stopping is also possible. Further, instead of starting trial delivery by the software of the user terminal, a configuration in which the content server performs trial delivery to the user and responds to the user that delivery is impossible when the reproduction state is bad is also possible. This method enables server access control with higher accuracy including the test delivery result.
[0019]
  FIG. 7 shows a method for estimating the quality of a wider area in the access network. The present invention can be applied to a case where a part of the access network is not made into a redundant path and has a star topology in which a higher-ranking trunk line station, regional representative station, etc. are uniquely determined for the user station / system. In this case, when the user subscribes to the service, in addition to the user ID and the user station / system ID, IDs such as trunk stations and representative stations that are uniquely determined are also input to the user status management table. The NW state management table is configured to be able to manage states in units of user stations, trunk stations, and representative stations, and the quality estimation control function is provided for each user station, each trunk station, and each representative station in the user state management table. The quality status is totaled, threshold processing is performed to determine whether it is normal / attention required / abnormal, etc., and it is described and stored in the NW status management table. This makes it possible to estimate the network status over a wider range for access networks that are prone to packet loss and congestion due to sudden link speed reduction. It is possible to regulate delivery in response to a new content delivery request from an end user who passes through.
[0020]
  FIG. 8 shows an implementation example of network state estimation in the vicinity of the data center where the content server is arranged and access control based thereon. First, the server management function holds correspondence information between the address of each content server and the server station / system ID to which the server is connected. This is information that should be managed when the content server is operated by itself. Since one user may access a plurality of servers simultaneously, a plurality of server addresses and a plurality of server stations / system IDs can be held.
  Also in this example, as in the implementation example of FIG. 4, the user status management table of the NW quality estimation control function describes and holds the user ID, user station / system ID, and user address given from the user management function (flow) (1)) Describes and holds transport layer quality and application layer quality collected for each end user (flow (2)). In this example, the server address accessed by the user is also collected and written in the user status management table at the same time, and the server station / system ID corresponding to the server address is retrieved from the server management function, and this is also the user status management table. (Flow (3)). The network state management table has a configuration capable of managing the quality state for each server station / system ID, and the NW quality estimation control function totals the user quality state for each server station / system ID in the user state management table. Perform excess determination processing to determine the status of normal, caution, and abnormality, and describe the result in the network status management table (flow (4)). This will backBoIt is possible to estimate a true quality state in consideration of application layer quality for a network in the vicinity of the data center exit where the content server of the local network is arranged.
[0021]
  FIG. 9 shows an implementation example of server access control using the quality estimation technique of the data center exit vicinity network according to the present invention. In a wide area server network in which content servers are distributed in the data centers 1 and 2, the quality control estimation control estimates that the vicinity of the data center 1 exit is in a state of caution or abnormality from the user status during content delivery. (Flow (1)). When the user 2 accesses the user management function and acquires an address (flow (2)), the address information is described in the user state management table of the network quality estimation control function (flow (3)). This user address is generally given by network authentication or service authentication executed at the time of access. When the user 2 requests a certain content from the program guide (flow (4)), the address of the NW quality estimation control server is notified from the program guide (flow).( Five )). In response to this, the user 2 makes an inquiry about the network state to the quality estimation control function (flow (6)). The quality estimation control function that has received the network status inquiry request queries the server management function for the content location, and the server management function notifies the content servers 1 and 2 as an optimal server supplement (flow (7)). The quality estimation control function refers to the network state management table and notifies the user 2 of the address of the content server 2 based on the estimation that the vicinity of the exit of the data center 1 is congested here (flow (8)). Based on this notification, the user 2 sends a program viewing request to the content server 2 (flow (9)) and receives delivery of the content (flow (10)). Thereby, wide area server load distribution based on network state estimation including the application layer can be realized.
[0022]
  FIG. 10 shows an implementation example of network quality estimation and server access control according to the present invention in a complex topology network. In a wide area IP network having a redundant route, the route is controlled by autonomous routing,TheIn addition, when intra-network route load balancing or the like is applied, it is difficult to completely grasp the passing route for each flow and specify the occurrence position of congestion. In FIG. 10, the network state management table configuration is a two-dimensional matrix by server station / system ID and user station / system ID, and the quality state for each user on the user state management table is represented by server station / system ID and user station. / Aggregate for each group having the same system ID, perform threshold excess determination processing, etc., and describe and hold the result in the network state management table. The quality estimation control function determines the user station / system ID when receiving a new content delivery request from the user, and inquires of the server management function to obtain a plurality of server stations / system IDs of the compensation server. Next, referring to the network status management table, it is determined from which server station / system ID the delivery status is the best, and the user is navigated to the content server connected to the server station / system ID. In the case of a complex topology, it is difficult to grasp the complete bottleneck position, but rough state estimation including the backbone and server access can be performed by managing the state of the same flow at the start and end stations as a virtual bundle connection. Control becomes possible.
[0023]
  Note that there are no other restrictions on the addresses given to the server and user used in the present invention as long as the server and user can be uniquely identified. Layer 3 IP (Internet Protocol) addresses can be applied, and higher layer information such as URL (Uniform Resource Locator) and Cookie can also be used as addresses. In the case of information that can be regularly stored in the user terminal such as a cookie, by simultaneously storing the user address on the user management table, address assignment by the user management function, automatic input to the user status management table, etc. 4 has an advantage that the part related to the flow (1) in FIG. 4 can be omitted after the first registration to the user management function. Furthermore, by using higher layer information, for example, when a 1SP subscriber connects multiple user terminals via a NAT (Network Address Translator), etc., user reception quality management in fine units such as for each user terminal is possible. It becomes.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
【Example】
[Example 1]
  In FIG. 11, an ISP provider provides a content delivery service to an end user by using a DSL network such as a regional IP network [5] of NTT East / West region company or Atsuka Networks [6] as an access network. The example of application of this invention in a case is shown. In this embodiment, as a user management function, a RADIUS authentication server is used by the ISP for user authentication and IP address assignment.
  As for information on the user state management table of the NW quality estimation control function, user ID and access provider ID information are acquired and input at the time of ISP subscription. The ISP cannot directly grasp the topology information of the regional IP network that is the other operator, but the NTT East / West regional company provides the correspondence between the user address / phone number and the user accommodation station as disclosure information. . The user station / system ID information can be input at the time of ISP subscription based on the present disclosure information. In addition, since other DSL operators often use the access lines and office space of NTT East / West area companies [7], the correspondence between user ID and user station / system ID is also based on this disclosure. Can be attached.
[0025]
  In this example, each user is authenticated by the RADIUS server when connecting to the ISP, and the IP address assigned to the user by the server is automatically input as user IP access information in the user state management table (flow ( 1)).
  When the content server delivers the content to each user, the NW quality estimation control function collects the transport layer quality, application layer quality, or both of the delivery session and determines the quality status such as good, caution, and abnormality. Judgment and description in the quality status area of the user status management table (flow (2)), and further aggregate the data in the quality status area for each user with the same user station / system ID. The user station / system state is estimated, and the result is described and held in the network state management table (flow (3)). As a result, the true network quality state can be grasped in units of user stations / systems.
[0026]
[Example 2]
  FIG. 12 shows an embodiment of the present invention when the service authentication function of the content delivery service is used as the user management function.
  In this embodiment, after connecting to the OCN via RADIUS authentication, the user accesses the service authentication server and receives authentication as a service. At this time, the service authentication server can grasp the correspondence between the user ID and the IP address, and inputs the result to the user state management table (flow (1)). The subsequent network quality state estimation for each user (flow (2)) and the quality state estimation for each user station / system (flow (3)) are the same as in the above embodiment.
  When the content delivery service provider is a different entity from the ISP, it is unlikely that the internal information of the ISP such as RADIUS will be disclosed. However, by cooperating with the service authentication function in this way, the same as in the first embodiment Network quality estimation control is possible. However, in the case of an entity different from the ISP, it is considered difficult for the content delivery service provider to obtain the user's access network provider information. Therefore, when inputting to the provider ID area of the user status management table, It is necessary to obtain access network operator information used for service contracts.
[0027]
【The invention's effect】
  In particular, packet loss and congestion occur due to the present invention.ShiFor easy access networks, true network quality estimation including application layer quality and server access control based on the estimation are possible. Even if another operator has an access network, for example, if the other operator discloses information on the user station to which the user is connected, the true network quality in units of user stations Estimation and control based on the estimation are possible.
[0028]
  In the quality status management for each user of this method, the location of the content server accessed by the user is also managed, and the quality of each virtual resource with the same server station / user station is designated, so that the network It is possible to control the selection of the optimum content server in consideration of the state.
  Also, for example, if only one user is in an abnormal state among users connected to the same user station, the possibility of network congestion is low, and it is estimated that there is a cause of abnormality in the access line, user terminal, etc. . As described above, this method can also be applied to determine whether there is a problem on the network side or on the access line / user terminal side.
[0029]
  As described above, in a wide-area backbone network, network quality degradation such as video streaming directly affects its own quality.TheContent can be delivered to end users while maintaining high quality and reliability. Content distribution / distribution companies can enclose content holders, CM sponsors, etc., and improve profitability by combining wide area distribution to a large number of end users distributed over a wide area and high quality / high reliability of distribution. It becomes.
[0030]
References:
[1] National Institute of Information and Communications Technology "Information and Communication Handbook" ISBN4-915724-61-1
[2] Supervised by Hiroshi Yasuda Future Net Series "Digital Visual Technology" Telecommunications Association ISBN4-88549-907-0
[3] Saigo, Wilderness, Okada, Kawaguchi “Easy OCN” ISBN4-88549-410-9
[4] www.microsoft.com/japan/sindows/windowsmedia/developers/wmpsdk/default.asp
[5] FLET'S ADSL vs Yahoo BB "Nikkei Communication 5-20, pp.104-111, 2002
[6] www.acca.ne.jp
[7] "DSL dissemination page",
    www.soumu.go.jp/joho_tsusin/watsnew/dsl/index.html
[Brief description of the drawings]
FIG. 1 is a diagram illustrating the influence of network congestion in a download application and a streaming application.
FIG. 2 is a diagram illustrating a configuration example of a typical Internet connection service network.
FIG. 3 is a diagram showing another configuration example of a typical Internet connection service network.
FIG. 4 is a diagram illustrating an implementation example of a network quality estimation method according to the present invention.
FIG. 5 is a diagram illustrating a network quality estimation method based on application layer quality and transport layer quality according to the present invention.
FIG. 6 is a diagram showing an implementation example of server access control based on network quality estimation according to the present invention.
FIG. 7 is a diagram illustrating a method for quality estimation of a wider area in a network according to the present invention.
FIG. 8 is a diagram showing a network quality estimation method in the vicinity of the data center exit according to the present invention.
FIG. 9 is a diagram showing an implementation example of server access control based on network quality estimation in the vicinity of the data center exit according to the present invention;
FIG. 10 is a diagram showing an implementation example of network quality estimation and server access control of a complex topology according to the present invention.
FIG. 11 is a diagram illustrating an embodiment of the present invention in which a RADIUS authentication server is used as a user management server.
FIG. 12 is a diagram showing another embodiment of the present invention in which a service authentication server is used as a user management server.

Claims (13)

For the content delivery network consisting of network, content server, end user terminal, content server management function, network management function, user management function, and quality estimation control function, grasp the congestion bottleneck status of each part of the network, and various as required In network quality estimation control method that maintains and improves overall delivery quality by performing quality control,
The quality estimation control function includes a user status management table and a network status management table, and the user status management table includes a user ID, a user station / system ID that identifies a station or network system to which the user is connected, a user address, and The user ID and the user station / system ID among these pieces of information are entered by the service manager when each user subscribes to the content delivery network service, or the quality The estimation control function is automatically entered,
The user management function includes a user management table indicating a correspondence relationship between a user ID and a user address. When each user accesses the user management function, the user management function updates the user address of the user management table, and the user address is set to the user address. Enter in the user address area of the user status management table,
The quality estimation control function, when the content server delivers the content to each user, to monitor both the transport layer quality and application layer quality of the delivery session, on a two-dimensional transport layer quality and application layer quality Determining the quality state such as good / attention required / abnormality indicating the area , and describing the quality state for each user in the quality state area of the user state management table,
The quality estimation control function sums up the data in the quality state area in two dimensions of transport layer quality and application layer quality for each user having the same user station / system ID, and the user who is good / careful / abnormal A network quality estimation control system characterized by estimating a state as a station / system and describing and storing it in a network state management table. The quality estimation control function, when the content server delivers streaming content to each user,
Video frame rate player software of the user terminal to monitor the number of lost packets, the number of repair packets, network quality estimation according to information such as the reception buffer state to claim 1, wherein the collection to Rukoto as the application layer quality control method. The quality estimation control function, when the content server delivers streaming content to each user,
The delivery session the TCP (Transport Control Protocol), a packet loss by monitoring the RTCP (Real Time Control Protocol), end-to-end delay, wherein, wherein the collection to Rukoto delay variation such as the transport layer quality Item 3. The network quality estimation control method according to Item 1 or 2. If there is a content delivery request to the user or Racing regulations,
The quality estimation control function identifies a user station / system ID of the end user from a user address included in the delivery request packet, refers to a network state management table,
When the quality status of the specified user station / system ID is cautionary or abnormal, it notifies the new content delivery request that delivery is impossible, and when the status is normal , the content containing the content 4. The network quality estimation control method according to claim 1, wherein a server address, a content identifier, and the like are notified. If there is a content delivery request to the user or Racing regulations,
The quality estimation control function indicates that when the specified user station / system ID is in a state requiring attention / abnormality, the user needs attention / abnormal state, and the address of the content server in which the content is stored, Notify the content identifier,
5. The network according to claim 4, wherein the software in the user terminal is connected to the content server on a trial basis and starts reception, and the connection is disconnected if the reception state is abnormal after a predetermined time has elapsed. Quality estimation control method. When the access network portion of the network is a star topology in which the upper station is uniquely determined for each user station / system,
The quality estimation control function also holds the upper station / system ID in the user state management table,
The quality estimation control function aggregates the data of the quality status area of the user status management table for each user having the same upper station / system ID, and determines the status of the upper station / system as good / attention required / abnormal In the network status management table
6. A delivery restriction process is performed in response to a new content delivery request from an end user passing through a certain upper station / system in a state of caution or abnormality. Network quality estimation control method. The content server management function holds correspondence information between the address of each content server and the server station / system ID that identifies the station or system to which the content server is connected,
The quality estimation control function also stores a server address and a server station / system ID accessed by the user in the user state management table,
The quality estimation control function collects the server address in addition to the transport layer quality and application layer quality of the delivery session and writes this in the user state management table,
The quality estimation control function refers to the server station / system ID corresponding to the server address in the content server management function, and writes the server station / system ID in the user state management table,
The quality estimation control function estimates the status of good / attention / abnormality by summing up data of the quality status area for each user having the same server station / system ID on the user status management table, 7. The network quality estimation control system according to claim 1, wherein a quality state for each system ID is also described and held in a network state management table. The content server management function manages the arrangement status of each content distributed and arranged on a plurality of servers,
The quality estimation control function, the user or Racing if regulations have content delivery request, the querying the contents server management function the content is arranged in the server station / system ID and server address,
The quality estimation control function refers to the network management table and notifies the user that delivery is not possible in response to the new content delivery request when all the quality statuses of the inquired server station / system ID are cautionary or abnormal. 8. The network quality estimation control system according to claim 7, wherein when there is one or more server stations / system IDs having a good quality state, a good server address is notified to the user. The network state management table holds a quality state for each virtual resource having the same server station / system ID and user station / system ID,
The quality estimation control function totals the quality status of the user status management table for each user having the same server station / system ID and user station / system ID, and determines the status such as good / attention required / abnormal Write to the network state management table;
The quality estimation control function, the user or Racing if regulations have content delivery request, the querying the contents server management function the content is arranged in the server station / system ID and server address,
The quality estimation control function refers to a network management table, determines a server station / system ID and a user station / system ID with the best quality state, and notifies a user of a corresponding server address. 8. The network quality estimation control method according to 8. 10. The network quality estimation control system according to claim 1, wherein an IP (Internet Protocol) address is used as the user address and the server address. 10. The network quality estimation control method according to claim 1, wherein an application layer identifier including a URL (Uniform Resource Locator), Cookie information, or the like is used as the user address and the server address. The network quality estimation control method according to claim 1, wherein a RADIUS authentication server is used as the user management function. The network quality estimation control system according to claim 1, wherein a content delivery service authentication server is used as the user management function.

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