WO2019190268A1

WO2019190268A1 - Dynamic control of content data transmission according to qoe report

Info

Publication number: WO2019190268A1
Application number: PCT/KR2019/003718
Authority: WO
Inventors: 김태현
Original assignee: (주)아이앤아이소프트
Priority date: 2018-03-30
Filing date: 2019-03-29
Publication date: 2019-10-03
Also published as: KR20190114672A

Abstract

A quality of experience (QoE) dynamic control system disclosed in the present specification comprises: a user terminal which receives content data from a content delivery network (CDN) duplication server and periodically transmits, to a QoE server, a QoE report including network-related information through an out-of-band channel; and a QoE management server which generates a network control signal on the basis of the network-related information and transmits the network control signal to the user terminal by including the network control signal in a QoE report response.

Description

Dynamic control of content data transfer based on QOE reports

Citation with Related Applications

This application claims the benefit of priority based on Korean Patent Application No. 10-2018-0037746 dated March 30, 2018, and all the contents disclosed in the documents of that Korean patent application are incorporated as part of this specification.

Field of technology

This specification relates to dynamic control of content data transmission according to a Quality of Experience (QoE) report.

Many users use a service that downloads and plays a large amount of media content such as a video through a wired / wireless network from a user terminal such as a mobile terminal or a computer, and a content provider provides a service for content satisfaction without interruption of content data transmission. Trying to provide.

The content provider may transmit content data to the user terminal through the replication server. That is, as one method of transmitting content data, the content provider may store at least some content in advance in the duplication server, and the user terminal may receive the pre-stored content data from the duplication server. The content delivery method through the replication server includes a content delivery network (CDN) service. The replica server may be, for example, a cache server, a ghost server, an edge server or a mirror server.

For example, the CDN service transmits the access information of the CDN replication server closest to the location of the user terminal requesting the content data among the plurality of CDN replication servers or the CDN replication server having the optimal access path to the user terminal. The terminal receives the content data from the CDN replication server in a streaming method or a download method.

There may be multiple CDN service providers that provide different network capabilities at different costs. For example, the content provider may transmit content to the user terminal through a plurality of CDN services by region or by content.

When a content provider provides a content service to a user by using a plurality of CDN services, the CDN continues to operate even if a CDN (or a network path for accessing the CDN) that is first accessed while receiving content data from a user terminal fails. There is a problem with trying to connect to.

In addition, regardless of the failure of the CDN to which the user terminal is initially connected, there is a need to change the CDN service provider according to the needs of the content provider while receiving the content data of the user terminal, but the conventional method does not solve this problem.

When a content provider of the related art provides content data through a CDN, a QoE dynamic control management method is required for the problem of continuously attempting to access the CDN even when a QoE quality decreases.

In addition, when a content provider provides content data through a plurality of CDN service providers, there is a need for an economical method of providing content data through a plurality of CDN service providers that does not degrade a user's QoE.

The present specification presents a QoE dynamic control system. The QoE dynamic control system receives content data from a replication server, and periodically transmits a QoE report including network related information through an out-of-band channel to a Quality of Experience (QoE) server. It may include a QoE management server to generate a network control signal based on the terminal and the network-related information, and to include in the QoE report response to transmit to the user terminal.

The system and other embodiments may include the following features.

The network related information may be network related information according to a network related information item preset in the user terminal. The QoE report response may include an item of network related information, and the user terminal may transmit a QoE report including network related information corresponding to the item of network related information to the QoE management server. The item of network related information may include a round trip time to a local gateway (GW), a wireless signal strength, and trace route information for a specific internet address. The network control signal is generated based on a result of analyzing the QoE report, and includes any one of address change information for accessing a new CDN replication server or bandwidth change information for receiving content data. While receiving the content data, the new CDN replication server may receive content data or change bandwidth according to the network control signal. The QoE report includes content play related information, and when the QoE management server determines that the initial buffering of the content data is finished based on the content play related information, address change information for accessing a new CDN replication server is included. The QoE report response is transmitted to the user terminal, and the content data transmission policy of the new CDN replication server may be different from the content data transmission policy of the previous CDN replication server. The QoE report response may include a code executable in the user terminal, and the code may be a code related to control of content data reception.

On the other hand, the present specification proposes a QoE management server. The QoE management server establishes an out-of-band channel with a user terminal that receives content data from a content delivery network (CDN) replication server, and provides network-related information from the user terminal through the out-of-band channel. Network unit periodically receiving a Quality of Experience (QoE) report, including the QoE report pre-processing unit for determining and pre-processing the QoE report to be analyzed according to preset criteria and the network related to the pre-processed QoE report It may include a QoE control unit for generating a QoE report response including a network control signal based on the information and transmits to the user terminal.

The QoE management server and other embodiments may include the following features.

The apparatus may further include a storage configured to store access information of a plurality of CDN replication servers capable of transmitting the content data, wherein the network control signal is generated based on a result of analyzing the QoE report and the plurality of CDN replication server access information. It may include any one of address change information for accessing a new CDN replication server or bandwidth change information for receiving content data. The QoE report preprocessing unit may determine the received QoE report and exclude it from the analysis target when the end network quality of the user terminal is less than or equal to a preset criterion. The QoE control unit analyzes the QoE report to have the user terminal measure a round trip time to a local gateway (GW), wireless signal strength, and trace route information for a specific internet address when the QoE has a preset QoE. A QoE report response including a network control signal may be generated and transmitted to the user terminal.

On the other hand, the present specification proposes a QoE management method of the QoE dynamic control system.

The user terminal receiving the content data from a Contents Delivery Network (CDN) replication server, the QoE management server and the user terminal establishing an out-of-band channel, and the user The terminal periodically transmits a QoE report including network related information to the QoE management server through the out-of-band channel, and the QoE management server generates a QoE report response including a network control signal based on the network related information. And generating and transmitting the generated information to the user terminal.

The QoE management method and other embodiments may include the following features.

The QoE report response may further include an operation of transmitting, by the user terminal, a QoE report including network related information corresponding to the received item of network related information to the QoE server. . The user terminal may further include an operation of receiving content data or changing content data reception bandwidth by accessing a new CDN duplication server according to the network control signal during the reproduction of the content data.

According to the embodiments disclosed in the present disclosure, when quality is degraded due to a CDN service provider, content data may be stably transmitted through a new CDN service provider, thereby stably managing a user's QoE.

According to the embodiments disclosed herein, when providing content data through a plurality of CDN service providers, it is possible to economically transmit content data through a plurality of CDN service providers without reducing the user's QoE.

1 schematically illustrates a QoE dynamic control system.

FIG. 2 is a diagram schematically showing a change in a required bitrate according to a content data reception state.

3 is an exemplary block diagram illustrating a configuration of a QoE management server.

4 is a flowchart illustrating an operation of a QoE management method of a QoE dynamic control system.

The technology disclosed herein may be applied to a Quality of Experience (QoE) management apparatus. However, the technology disclosed herein is not limited thereto, and may be applied to all electronic devices and methods to which the technical spirit of the technology may be applied.

It is to be noted that the technical terms used herein are merely used to describe particular embodiments and are not intended to limit the spirit of the technology disclosed herein. In addition, the technical terms used herein should be construed as meanings generally understood by those skilled in the art to which the technology disclosed herein belongs, unless defined otherwise in this specification. It should not be interpreted in a comprehensive sense, or in an overly reduced sense. In addition, when the technical terms used herein are incorrect technical terms that do not accurately express the spirit of the technology disclosed herein, technical terms that can be properly understood by those skilled in the art to which the technology disclosed herein belongs. It should be replaced by. In addition, the general terms used herein should be interpreted as defined in the dictionary, or according to the context before and after, and should not be interpreted in an excessively reduced sense.

As used herein, terms including ordinal numbers such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments disclosed herein will be described in detail with reference to the accompanying drawings, and the same or similar components will be given the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted.

In addition, in describing the technology disclosed herein, if it is determined that the detailed description of the related known technology may obscure the gist of the technology disclosed herein, the detailed description thereof will be omitted. In addition, it is to be noted that the accompanying drawings are only for easily understanding the spirit of the technology disclosed in this specification, and the spirit of the technology should not be construed as being limited by the accompanying drawings.

1 schematically illustrates an embodiment including a content delivery dynamic control system using QoE reports. The content delivery dynamic control system may include one or more user terminals 400 and a QoE management server 300.

The user terminal 400 may be connected to the network by wire / wireless to communicate with the QoE management server 300. The user terminal 400 of the embodiments disclosed herein includes not only a personal computer (PC) but also a tablet computer, a smart phone, and the like.

The networks disclosed herein include, for example, wireless networks, wired networks, public networks such as the Internet, private networks, global systems for mobile communication networks (GSM) networks, general packet wireless networks (general) packet radio network (GPRS), local area network (LAN), wide area network (WAN), metropolitan area network (MAN), cellular network, public switched telephone network PSTN, personal area network, Bluetooth, Wi-Fi Direct, Near Field communication, UltraWide band, combinations thereof, or any other It may be a network, but is not limited to these.

The user terminal 400 may receive content access information for a content providing request from a content provider or the like through a network, and request a content transmission to the CDN replication server 100 according to the access information. Alternatively, the user terminal 400 may receive content access information from the QoE management server 300. In one embodiment, the content provider redirects to the QoE management server 300 when the content provider receives an IP address for providing content through a name server (not shown), and the QoE management server 300 requests the user. In consideration of the situation of the terminal 400, an appropriate CDN service provider may be determined from among a plurality of CDN service providers having corresponding contents, and the corresponding access path may be informed to the user terminal 400. Alternatively, the user terminal 400 may request to provide content by accessing an IP address of the QoE management server 300 stored in advance, and the QoE management server 300 may consider an appropriate CDN in consideration of the requesting situation of the user terminal 400. The service provider may be determined to inform the user terminal 400 of the access path.

Thereafter, the user terminal 400 establishes an in-bound channel for content data transmission with the CDN replication server 100 and receives the content data through the corresponding channel to play the content data in a streaming or download manner. Can be.

The streaming method of the content data disclosed in the present specification may be, for example, Real Time Messaging Protocol (RTMP), HTTP-based protocol (eg, HLS / HDS, Smooth Streaming, Dynamic Streaming, MPEG DASH, etc.). ) And the like, but is not particularly limited thereto.

The user terminal 400 may establish an out-of-bound channel with the QoE management server 300 in addition to the in-band channel with the CDN replication server 100. The establishment of the out-of-band channel may mean that the OoE management server is connected to exchange data other than content data. The out-of-band channel is operated for a content provider or another service provider when the content provider transmits content through various types of replication servers in the network without establishing a connection for content transmission with a user terminal directly. The QoE server may be used to exchange control information with the user terminal. Alternatively, the out-of-band channel may be difficult to exchange control information with the in-band channel because software that is not within the management scope of the content reproduction and management program in the user terminal has limitations such as structure, implementation, update, or error. In order to overcome the same limitation, it may be used to receive control information or the like from a content provider or other service provider.

As an embodiment, the user terminal may periodically transmit a QoE report to the QoE management server 300 through the out-of-band channel. In another embodiment, the user terminal may receive information necessary for decrypting the encrypted content data through the out-of-band channel. In another embodiment, the user terminal may receive an execution code necessary for content reproduction through the out-of-band channel.

Meanwhile, when the user terminal 400 receives data other than the content data through an in-band channel for receiving the content data, the user terminal 400 may deliver the data to an agent requiring the data according to the operating system of the user terminal 400. There may be no.

In one embodiment, a key rotation may be applied when receiving and playing content data to which DRM (Digital Rights Management) is applied. In this case, the RO (Right Object) corresponding to the new key needs to be transmitted. However, since Android Media DRM of the Android operating system supports only the request / response method, if the user terminal 400 receives the DRM / CAS RO in one-way push form in the in-band channel, the DRM agent in the Android operating system Can't deliver. Therefore, as an embodiment, if the user terminal 400 includes the RO Request message at the time of transmitting the QoE report periodically using the out-of-band channel established with the QoE management server 300 for transmitting the QoE report, the QoE is transmitted. The management server 300 may deliver the usage time and RO of the next key together with the response to the QoE report.

Accordingly, the QoE management server 300 can reliably receive a QoE report or transmit a response to the user terminal 400 through the user terminal 400 and the out-of-band channel, and manage the DRM content license as well as the QoE report. If there is a need to periodically transmit to the user terminal 400 there is an advantage that can utilize the channel.

In addition, the QoE management server 300 may be executed in the user terminal 400 and dynamically include an executable code related to control of content data reception in the QoE report response even when the content data is being received. 400).

For example, by transmitting a code for determining whether the QoE quality is deteriorated to the user terminal 400, the user terminal 400 determines the QoE quality deterioration by itself, and when the QoE quality is low, the relevant network information is measured to manage QoE. The server 300 may transmit the preset code indicating the QoE quality state to the QoE management server 300.

The QoE report may include device information (which may include information about the user terminal 400 and the content player), playback information (which may include playback start time and buffering information as information related to content playback), and track information ( Content data segment information such as audio, video, and text), and may also include QoE quality and user's operation history.

The QoE report can be designed in a structure that can be easily extended and changed according to the load, and the QoE management server 300 can transmit the format of the QoE report to the user terminal 400 as a script.

The user terminal 400 may transmit a QoE report including network related information to the QoE management server 300. The item of network related information may be preset in the user terminal 400 or may be received from the QoE management server 300 in response to a QoE report.

The item of network related information may be information about an access network 600 for the user terminal 400 to access a network. For example, the item of the network-related information may include a round trip time to a local gateway 500 on the access network, a wireless signal strength when using the access network through wireless communication, or belonging to the inside or outside of the access network. It may include trace route information for a specific Internet address, information that may be collected through other Simple Network Management Protocol (SNMP), and status information between UE-BS when using mobile communication, but is not limited thereto. Do not.

The user terminal 400 may measure one or more network-related information according to the items of the network-related information and include it in the QoE report and transmit the same to the QoE management server 300, and the QoE for receiving the content data of the user terminal 400. If the quality is good, network related information may not be measured or transmitted.

In one embodiment, all of the user terminals 400 (nodes) connected to the QoE management server 300 may set QoE determination criteria that are preset or dynamically instructed by the QoE management server 300 during content data playback. QoE quality determination can be performed periodically. As a result of determining the QoE quality, if the QoE quality is not good, the network analysis of the network environment of the user terminal 400 may be performed according to the items of the network related information, and the network related information may be measured and included in the QoE report.

As another embodiment, when the user terminal 400 is receiving and playing content data using a specific network, the user terminal 400 may periodically measure network related information and include the same in a QoE report. The specific network may be determined according to the type of network, the network region where the user terminal 400 is located, and the network operator.

For example, if the user terminal 400 is receiving content data from the CDN replication server 100 located in the region B through the network of the region A, the user terminal 400 is the content data through the mobile network of a specific C operator. When receiving or when the user terminal 400 is receiving content data using public WiFi, network-related information may be periodically measured and included in the QoE report.

It should be noted that the QoE management server 300 can be dynamically changed even if the specific condition is other than a network related condition.

The user terminal 400 may periodically transmit a QoE report to the QoE management server 300, and the period may be preset or dynamically changed in the QoE management server 300 according to the load of the QoE management server 300. .

When the QoE management server 300 receives the QoE report from the user terminal 400, the QoE management server 300 analyzes the corresponding QoE report and generates a QoE report response. The QoE report response may include an item of network related information to be measured by the user terminal 400.

As an embodiment, after analyzing the playback information included in the QoE report transmitted from the user terminal 400, it is determined that the buffering speed is slower than expected by the QoE management server 300 after the user terminal 400 starts receiving the content data. In this case, the QoE management server 300 may include network related information items such as a round trip time to a local gateway (GW), wireless signal strength, trace route information for a specific Internet address, or packet loss rate in the QoE report response. .

When the user terminal 400 receives the QoE report response including the network-related information item, the QoE management server 300 includes the result of measuring network-related information according to the item in the QoE report and transmits the QoE report in the next cycle. Can be sent to.

In another embodiment, the network management information item is pre-registered with the playback agent setting of the user terminal 400, and the QoE management server 300 simply sends a QoE report response including the network management information analysis request. Can be sent to. When the user terminal 400 receives a QoE report response including a network management information analysis request from the QoE management server 300, the user terminal 400 measures network related information according to a preset network related information item and includes the result in the QoE report. The QoE management server 300 may transmit the same.

When the QoE management server 300 receives a QoE report including network-related information from the user terminal 400, the QoE management server 300 analyzes the network-related information to determine the cause of the QoE degradation of the user terminal 400 and control the network appropriate to the cause. The signal may be generated and included in the QoE report and transmitted to the user terminal 400.

The QoE management server 300 may apply a model that learns QoE reports received from the user terminals 400 using machine learning to determine the cause of the QoE degradation. In this case, learning may be performed by weighting each item information included in the QoE report, and the corresponding weight may be changed. In addition, the model trained by machine learning does not limit the model generation method such as supervised learning, unsupervised learning, and semi-supervised learning, and deep learning is also used. Of course it can.

As an example, if the response time from the content replication server is determined to be abnormally long as a result of analyzing the QoE report, the QoE management server 300 may change address for accessing the new CDN replication server 200 as a network control signal. May be included in the QoE report response and transmitted to the user terminal 400, and the user terminal 400 may request content data by accessing the received new CDN replication server 200. At this time, the new CDN replication server 200 may be a replication server in another region operated by the same CDN service provider, or may be a CDN replication server operated by another CDN service provider. In the case of a CDN replication server operated by another CDN service provider, it may be operated with a network policy different from the network policy (bandwidth, access port, billing system, etc.) of the existing CDN replication server 100.

As another embodiment, if the QoE management server 300 determines that there are not many or too many user terminals 400 connected to the CDN replication server 100, the QoE management server 300 may provide information indicating the bandwidth change to the user terminals 400. It may be included in the report response and transmitted to the user terminal 400.

In another embodiment, if the QoE quality is not degraded as a result of analyzing the QoE report of the user terminal 400, but if it is determined that the initial buffering of the content data is finished as a result of analyzing the content playback related information, another CDN service provider Address change information for accessing a new CDN replication server 200 accessible to the CDN replication server 200 operated by the QoE report response may be included and transmitted to the user terminal 400.

FIG. 2 is a diagram schematically illustrating a change in a required bitrate 210 according to time lapse upon receiving content data. Referring to FIG. 2, when the content is a video, high performance is required only until the user terminal 400 fills a buffer necessary for the initial reception of content data 220 due to the characteristics of the service, and thereafter, during continuous playback 230. It can be seen that only the performance of the video encoding bitrate is required.

Accordingly, the QoE management server 300 analyzes the content reproduction related information of the user terminal 400 so that the user terminal 400 receives the content data through the high performance CDN service during the initial buffering period, and the initial buffering is completed. If it is determined, the content data may be received by changing to another CDN service that satisfies the minimum performance.

3 is an exemplary block diagram illustrating the configuration of a QoE management server 300. The QoE management server 300 disclosed herein may include a network unit 310, a QoE report preprocessor 320, and a QoE control unit 330.

The network unit 310 may be configured as a wired and / or wireless communication module. For example, the network unit 310 may include Wi-Fi (Wireless Fidelity, Wi-Fi), Bluetooth, Zigbee, near field communication (NFC), and Wi-Fi (Wireless Broadband Internet: Wibro). It may include a wireless communication module and a wired communication module such as a wired LAN (LAN) such as Ethernet. The network unit 310 may perform wired or wireless communication with the user terminal 400 through a network.

The network unit 310 may establish an out-of-bound channel with the user terminal 400 and receive a QoE report from the user terminal 400 through the corresponding channel.

As described above, the QoE report transmitted from the user terminal 400 may include device information (which may include information about the user terminal 400 and the content player), playback information (reproduction start time and buffering information as information related to content playback). It may include)), track information (content data segment information such as audio, video, text, etc.), QoE quality information or the user's operation history.

In addition, the QoE report may include network-related information such as round trip time to local gateway (GW), wireless signal strength, trace route information or packet loss rate for a specific Internet address.

The QoE report preprocessing unit 320 may determine whether to analyze the QoE report received from the user terminal 400 and perform pre-processing. For example, by determining the network-related information included in the QoE report, the failure or problem of the CDN replication server 100 is not a problem of deteriorating QoE quality due to a connection path, but a problem of declining end network quality of the user terminal 400. If it is determined, it may be excluded from the analysis target of the QoE controller 330.

The QoE control unit 330 may analyze the network-related information included in the QoE report, which is an analysis target, to determine the cause of the QoE quality degradation, and at this time, learn the QoE reports received from the user terminals 400 using machine learning. One model can be applied.

If the QoE control unit 330 determines that the CDN replication server 100 providing the content data is a failure, performance degradation, or load increase, the QoE report reports the address change information for accessing the new CDN replication server 200 as a network control signal. Included in the response can be transmitted to the user terminal 400, the user terminal 400 can access the new CDN replication server 200 received and request the content data.

In this case, the QoE management server 300 may further include a storage unit 340 for storing access information of the plurality of CDN replication servers 100 to 200 capable of transmitting content data.

The storage unit 340 may include a magnetic storage media or a flash storage media, but the scope of the present invention is not limited thereto.

4 is a flowchart illustrating an operation of a QoE management method of a QoE dynamic control system. The QoE management method described below may be performed while the user terminal 400 receives content data from the CDN replication server 100 or when the user terminal 400 requests content data for the first time.

The user terminal 400 may make a content providing request to the content provider or the QoE management server 300 through the network, receive content access information, and request content data transmission to the CDN replication server 100 according to the access information. In one embodiment, the content provider redirects to the QoE management server 300 when the content provider receives an IP address for providing content through a name server (not shown), and the QoE management server 300 requests the user. In consideration of the situation of the terminal 400, an appropriate CDN service provider may be determined from among a plurality of CDN service providers having corresponding contents, and the corresponding access path may be informed to the user terminal 400. Alternatively, the user terminal 400 may request to provide content by accessing an IP address of the QoE management server 300 stored in advance, and the QoE management server 300 may consider an appropriate CDN in consideration of the requesting situation of the user terminal 400. The service provider may be determined to inform the user terminal 400 of the access path.

Thereafter, the user terminal 400 may establish an in-bound channel for transmitting content data with the CDN replication server 100 (S410) and receive content data through the corresponding channel (S420).

The QoE report and QoE report responses between the QoE management server 300 and the user terminal 400 will be described below (S431 to S434). The transmission of the QoE report and the QoE report response is not limited in number, but is represented four times in FIG. 4, but is not limited thereto.

The user terminal 400 establishes an out-of-bound channel with the QoE management server 300 in addition to the in-band channel with the CDN replication server 100 and periodically reports the QoE to the QoE management server 300. It may be transmitted (S431).

In one embodiment, the QoE management server 300 is a QoE analysis of the playback information included in the QoE report transmitted from the user terminal 400 or the user terminal 400 is preset or dynamically instructed from the QoE management server 300 Based on the QoE quality result determined using the determination criteria, a QoE report response including a network-related information item may be generated and transmitted to the user terminal 400 (S432).

When the user terminal 400 receives the QoE report response including the network-related information item, the QoE management server 300 includes the result of measuring network-related information according to the item in the QoE report and transmits the QoE report in the next cycle. Can be transmitted (S433).

In another embodiment, the network management information item is pre-registered with the playback agent setting of the user terminal 400, and the QoE management server 300 simply sends a QoE report response including the network management information analysis request. It may also transmit (S432).

When the QoE management server 300 receives a QoE report including network-related information from the user terminal 400 (S433), the QoE management server 300 analyzes the network-related information to determine the cause of the QoE degradation of the user terminal 400 and the corresponding cause. The appropriate network control signal may be generated and included in the QoE report and transmitted to the user terminal 400 (S434).

As an example, if the response time from the content replication server is determined to be abnormally long as a result of analyzing the QoE report, the QoE management server 300 may change address for accessing the new CDN replication server 200 as a network control signal. Alternatively, the QoE report response including the network control signal such as changing the bandwidth may be transmitted to the user terminal 400 (S434). Thereafter, the user terminal 400 accesses the received new CDN replication server 200 and requests content data (S440), and subsequently receives the content data following the previously received content data (S450).

As another embodiment, when analyzing the content playback related information of the QoE report, if the user terminal 400 determines that the initial buffering of the content data, the new CDN that can be connected to the CDN replication server operated by another CDN service provider Address change information for accessing the replication server 200 may be included in the QoE report response and transmitted to the user terminal 400 (S434).

At this time, the new CDN replication server 200 may be a replication server in another region operated by the same CDN service provider, or may be a CDN replication server operated by another CDN service provider. In the case of a CDN replication server operated by another CDN service provider, it may be operated with a network policy different from the network policy (bandwidth, access port, billing system, etc.) of the existing CDN replication server 100. In addition, the user terminal 400 may change the bandwidth for receiving the content data according to the received QoE report response (S460), which is not always made with changing the connection to the new CDN replication server 200, but is independent. In the embodiments of the present specification, the user terminal connects to the CDN replication server of the new CDN service provider and takes over the content data, but is not limited to a plurality of CDN service providers. The same applies to the operation of CDN replication server.

The method for controlling content data transmission according to the embodiments disclosed herein may be embodied as computer readable codes on a computer readable recording medium. Computer-readable recording media include all kinds of recording devices that store data that can be read by a computer system. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disks, optical data storage devices, and the like. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. In addition, functional programs, codes, and code segments for implementing the present invention can be easily inferred by programmers in the art to which the techniques of this specification pertain.

Preferred embodiments of the technology of the present disclosure have been described with reference to the accompanying drawings. Here, the terms or words used in the present specification and claims should not be construed as being limited to ordinary or dictionary meanings, but should be construed as meanings and concepts corresponding to the technical spirit of the present invention.

The scope of the present invention is not limited to the embodiments disclosed herein, and the present invention may be modified, changed, or improved in various forms within the scope of the spirit and claims of the present invention.

Claims

A user who receives content data from a Contents Delivery Network (CDN) replication server and periodically sends QoE reports containing network-related information through an out-of-band channel to a Quality of Experience (QoE) server. Terminal; And

QoE dynamic control system comprising a QoE management server for generating a network control signal based on the network-related information, included in the QoE report response to transmit to the user terminal.
According to claim 1,

The network-related information QoE dynamic control system corresponding to the network-related information items preset in the user terminal.
According to claim 1,

The QoE report response includes an item of network related information,

And the user terminal transmits a QoE report including network related information corresponding to the item of network related information to the QoE management server.
The method according to claim 2 or 3,

The network-related information item includes a round trip time to a local gateway (GW), wireless signal strength, and trace route information for a specific internet address.
According to claim 1,

The network control signal is generated based on a result of analyzing the QoE report, and includes any one of address change information for accessing a new CDN replication server or bandwidth change information for receiving content data.

The user terminal is connected to a new CDN replication server according to the network control signal during the reception of the content data QoE dynamic control system for receiving content data or changing the bandwidth.
According to claim 1,

The QoE report includes content related information,

When the QoE management server determines that the initial buffering of the content data is finished based on the content reproduction related information, the QoE management server transmits a QoE report response including address change information for accessing a new CDN replication server to the user terminal.

The content data transfer policy of the new CDN replication server is different from the content data transfer policy of the previous CDN replication server.
According to claim 1,

The QoE report response includes a code executable in the user terminal, the code being a code related to control of content data reception.
QoE that establishes an out-of-band channel with a user terminal that receives content data from a content delivery network (CDN) replication server, and includes network-related information from the user terminal through the out-of-band channel (QoE). A network unit periodically receiving a Quality of Experience report;

A QoE report preprocessing unit for determining and preprocessing an analysis target of the QoE report according to a preset criterion; And

QoE management server including a QoE control unit for generating a QoE report response including a network control signal based on the network-related information included in the pre-processed QoE report and transmits to the user terminal.
The method of claim 8,

The apparatus may further include a storage unit which stores access information of a plurality of CDN replication servers capable of transmitting the content data.

The network control signal is generated based on a result of analyzing the QoE report and the plurality of CDN replication server access information, and among the address change information for accessing a new CDN replication server or bandwidth change information for receiving content data. QoE management server containing either.
The method of claim 8,

The QoE report preprocessing unit determines the received QoE report and excludes from the analysis target when the end network quality of the user terminal is less than a predetermined criterion.
The method of claim 8,

The QoE control unit analyzes the QoE report to have the user terminal measure a round trip time to a local gateway (GW), wireless signal strength, and trace route information for a specific internet address when the QoE has a preset QoE. QoE management server for generating a QoE report response including a network control signal to transmit to the user terminal.
Receiving, by the user terminal, content data from a Contents Delivery Network (CDN) replication server;

Establishing an out-of-band channel between a quality of experience (QoE) management server and the user terminal;

The user terminal periodically transmitting a QoE report including network related information to the QoE management server through the out-of-band channel; And

And generating, by the QoE management server, a QoE report response including a network control signal based on the network related information, and transmitting the generated QoE report response to the user terminal.
The method of claim 12,

The QoE report response includes an item of network related information,

And transmitting, by the user terminal, a QoE report including network related information corresponding to the received item of network related information to the QoE server.
The method of claim 13,

And the user terminal accessing a new CDN duplication server according to the network control signal during the reproduction of the content data, and receiving content data or changing content data reception bandwidth.