WO2013042758A1 - コンテンツ配信システム、キャッシュサーバおよびコンテンツ配信方法 - Google Patents
コンテンツ配信システム、キャッシュサーバおよびコンテンツ配信方法 Download PDFInfo
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- WO2013042758A1 WO2013042758A1 PCT/JP2012/074150 JP2012074150W WO2013042758A1 WO 2013042758 A1 WO2013042758 A1 WO 2013042758A1 JP 2012074150 W JP2012074150 W JP 2012074150W WO 2013042758 A1 WO2013042758 A1 WO 2013042758A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6131—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a mobile phone network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
- H04L67/568—Storing data temporarily at an intermediate stage, e.g. caching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/231—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion
- H04N21/23106—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion involving caching operations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
- H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
- H04N21/234381—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements by altering the temporal resolution, e.g. decreasing the frame rate by frame skipping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
- H04N21/64723—Monitoring of network processes or resources, e.g. monitoring of network load
- H04N21/64738—Monitoring network characteristics, e.g. bandwidth, congestion level
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
- H04N21/64784—Data processing by the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/2866—Architectures; Arrangements
- H04L67/288—Distributed intermediate devices, i.e. intermediate devices for interaction with other intermediate devices on the same level
Definitions
- the present invention is based on priority claims of Japanese Patent Application Nos. 2011-205465 (filed on September 21, 2011) and 2011-205466 (filed on September 21, 2011), The entire contents of the application are incorporated herein by reference.
- the present invention relates to a content distribution system, a cache server, and a content distribution method, and in particular, after caching moving image content in a mobile network, various terminals (for example, mobile phones, smart phones, PCs (Personal Computers), game machines, etc.) Content delivery system, cache server, and content delivery method.
- the mobile network will be increased in speed and capacity by LTE (Long Term Evolution), EPC (Evolved Packet Core) technology, and the like. Along with this progress, it is expected that content distribution for distributing content to various terminals including mobile terminals will be spread from now on via mobile networks.
- LTE Long Term Evolution
- EPC Evolved Packet Core
- Patent Document 1 describes a content distribution method for distributing content stored in a content server connected to the Internet to a large number of unspecified client terminals while temporarily storing the content in a plurality of cache servers.
- Patent Document 2 in order to make the reproduction of video data at the client high quality in a system for distributing video data from the server to the client, the client distributes to the server performance information describing its own performance. Video distribution system is described.
- content requests from all terminals are transmitted to a distribution server device of the Internet via a packet transfer device. Also, the distribution server distributes the content to all the terminals via the packet transfer device.
- the bandwidth (throughput) of the mobile network fluctuates in time depending on the traffic volume.
- the conventional content distribution system continuously distributes content of a certain bit rate regardless of this fluctuation. Therefore, if the bandwidth continues to fall below the delivery bit rate, the content can not be delivered, and the data buffered at the client is exhausted, and the moving image being played back may freeze or the sound may be interrupted. There is a problem of When such an event occurs, the viewer's QoE (Quality of Experience) is greatly impaired.
- the conventional content delivery system even future data that is not necessary for the current viewing of the viewer will be delivered. Therefore, when the viewer stops viewing halfway, there is a problem that unreproduced data for the future, which has already been distributed, is wasted. That is, the conventional content delivery system has a problem that it consumes the limited bandwidth of the mobile network unnecessarily.
- An object of the present invention is to provide a content delivery system, a cache server and a content delivery method which contribute to such a demand.
- the content delivery system is With multiple cache servers on the mobile network, Each of the plurality of cache servers is A content temporary storage unit for temporarily storing at least a part of the content held by the distribution server device for distributing the content over the Internet; A determination unit that determines, from among the plurality of cache servers, a cache server storing content requested from the portable terminal using information included in a content request message from the portable terminal; A content securing unit that reads the file of the requested content from the determined cache server and outputs the file to the content temporary storage unit; The bandwidth of the mobile network is estimated based on a predetermined signal from the portable terminal, the file of the requested content is read out from the content temporary storage unit, and the bit rate of the stream extracted from the file exceeds the bandwidth In order to prevent this, a stream is generated by deleting some frames from the stream, and the distribution unit stores the generated stream in a packet and sends the packet to the portable terminal.
- the cache server is A content temporary storage unit for temporarily storing at least a part of the content held by the distribution server device for distributing the content over the Internet;
- a discrimination unit that discriminates, from among a plurality of cache servers provided on a mobile network, a cache server storing content requested by the portable terminal using information contained in a content request message from the portable terminal
- a content securing unit that reads the file of the requested content from the determined cache server and outputs the file to the content temporary storage unit
- the bandwidth of the mobile network is estimated based on a predetermined signal from the portable terminal, the file of the requested content is read out from the content temporary storage unit, and the bit rate of the stream extracted from the file exceeds the bandwidth
- a stream is generated by deleting some frames from the stream, and the distribution unit stores the generated stream in a packet and sends the packet to the portable terminal.
- the content delivery method is The cache server temporarily storing at least a part of the content held by the distribution server device for distributing the content over the Internet in a content temporary storage unit provided therein; Determining the cache server storing the content requested from the portable terminal from among a plurality of cache servers provided on the mobile network, using information contained in the content request message from the portable terminal; , Reading out the file of the requested content from the determined cache server and outputting the file to the content temporary storage unit; Estimating the bandwidth of the mobile network based on a predetermined signal from the mobile terminal; Reading out the requested content file from the content temporary storage unit; Generating a stream in which some frames are deleted from the stream so that the bit rate of the stream extracted from the read file does not exceed the bandwidth, storing the generated stream in a packet and sending it to the portable terminal And.
- the content delivery system is With multiple cache servers on the mobile network, Each of the plurality of cache servers is A content temporary storage unit for temporarily storing at least a part of the content held by the distribution server device for distributing the content over the Internet; A determination unit that determines, from among the plurality of cache servers, a cache server storing content requested from the portable terminal using information included in a content request message from the portable terminal; A content securing unit that reads the file of the requested content from the determined cache server and outputs the file to the content temporary storage unit; The bandwidth of the mobile network is estimated based on a predetermined signal from the portable terminal, the file of the requested content is read out from the content temporary storage unit, and the bit rate of the stream extracted from the file exceeds the bandwidth In order to avoid this, a stream in which some frames are deleted from the stream is generated and stored in a file, and the packet including the file storing the adjusted stream is stored in the buffer of the portable terminal for at least a part of the period. And a distribution unit configured to transmit
- the cache server is A content temporary storage unit for temporarily storing at least a part of the content held by the distribution server device for distributing the content over the Internet;
- a discrimination unit that discriminates, from among a plurality of cache servers provided on a mobile network, a cache server storing content requested by the portable terminal using information contained in a content request message from the portable terminal
- a content securing unit that reads the file of the requested content from the determined cache server and outputs the file to the content temporary storage unit
- the bandwidth of the mobile network is estimated based on a predetermined signal from the portable terminal, the file of the requested content is read out from the content temporary storage unit, and the bit rate of the stream extracted from the file exceeds the bandwidth
- a stream in which some frames are deleted from the stream is generated and stored in a file, and the packet including the file storing the adjusted stream is stored in the buffer of the portable terminal for at least a part of the period.
- a distribution unit configured to transmit to the portable terminal while controlling the timing of transmission
- the content delivery method is The cache server temporarily storing at least a part of the content held by the distribution server device for distributing the content over the Internet in a content temporary storage unit provided therein; Determining the cache server storing the content requested from the portable terminal from among a plurality of cache servers provided on the mobile network, using information contained in the content request message from the portable terminal; , Reading out the file of the requested content from the determined cache server and outputting the file to the content temporary storage unit; Estimating the bandwidth of the mobile network based on a predetermined signal from the mobile terminal; Reading out the requested content file from the content temporary storage unit; Generating a stream obtained by deleting some frames from the stream so that the bit rate of the stream extracted from the read file does not exceed the bandwidth, and storing the stream in the file; Sending the packet including the file storing the adjusted stream to the mobile terminal while controlling the timing of sending the packet according to the buffer capacity of the mobile terminal for at least a part of the period.
- cache server and content delivery method it is possible to prevent degradation of QoE (Quality of Experience) of the user due to fluctuation of bandwidth of the mobile network when delivering content via the mobile network. be able to.
- QoE Quality of Experience
- the content delivery system of the present invention comprises a plurality of cache servers (110_1 to 110_N) on a mobile network (150), each of the plurality of cache servers (110_1 to 110_N) being the Internet.
- a content temporary storage unit (113) for temporarily storing at least a part of the content held by the distribution server device (121) distributing the content on the content request message, and a content request message from the portable terminal (170)
- a discriminator (117) for discriminating a cache server storing contents requested from the portable terminal (170) from among a plurality of cache servers (110_1 to 110_N) using Is the cache server determined the file?
- the content securing unit (112) to read out and output to the content temporary storage unit (113), and the bandwidth of the mobile network (150) is estimated based on the predetermined signal from the portable terminal (170), and the requested content file Content from the content temporary storage unit (113), and a stream obtained by deleting some frames from the stream is generated so that the bit rate of the stream extracted from the file does not exceed the bandwidth, and the generated stream is packetized And a delivery unit (114) for storing and sending it to the portable terminal (170).
- the distribution unit (114) divides and reads the file of the requested content from the content temporary storage unit (113), and the bit rate of the stream extracted from the divided file does not exceed the bandwidth.
- a stream may be generated by deleting low priority frames from the stream.
- the distribution unit (114) When the distribution unit (114) receives from the portable terminal (170) a response packet to the transmission packet transmitted to the portable terminal (170), the difference between the transmission time of the transmission packet and the reception time of the response packet And, according to the size of the transmission packet, the bandwidth of the mobile network (150) may be estimated. On the other hand, when the distribution unit (114) receives a signal indicating that the mobile network (150) is in a congestion state from the portable terminal (170), the distribution unit (114) prevents the packet from being sent out for a predetermined period. It is also good.
- the plurality of cache servers may be transparent or completely transparent proxy servers (120_1 to 120_N).
- the mobile network may be a 3G (3rd Generation) mobile network or a Long Term Evolution (LTE) / Evolved Packet Core (EPC) network (250).
- 3G 3rd Generation
- LTE Long Term Evolution
- EPC Evolved Packet Core
- [Form 1] It is as the content delivery system which concerns on a said 1st viewpoint.
- the distribution unit divides and reads the file of the requested content from the content temporary storage unit, and prioritizes the stream so that the bit rate of the stream extracted from the divided file does not exceed the bandwidth.
- a stream may be generated by deleting low-order frames.
- [Form 3] When the distribution unit receives from the portable terminal a response packet to the transmission packet transmitted to the portable terminal, a difference between the transmission time of the transmission packet and the reception time of the response packet, and the transmission packet Depending on the size, the bandwidth of the mobile network may be estimated.
- the distribution unit may not transmit the packet over a predetermined period when the signal indicating that the mobile network is in congestion is received from the portable terminal.
- the plurality of cache servers may be transparent or completely transparent proxy servers.
- the mobile network may be a 3G mobile network or a Long Term Evolution (LTE) / Evolved Packet Core (EPC) network.
- LTE Long Term Evolution
- EPC Evolved Packet Core
- It is as a cache server which concerns on a said 2nd viewpoint.
- the distribution unit divides and reads the file of the requested content from the content temporary storage unit, and prioritizes the stream so that the bit rate of the stream extracted from the divided file does not exceed the bandwidth.
- a stream may be generated by deleting low-order frames.
- the distribution unit When the distribution unit receives from the portable terminal a response packet to the transmission packet transmitted to the portable terminal, a difference between the transmission time of the transmission packet and the reception time of the response packet, and the transmission packet Depending on the size, the bandwidth of the mobile network may be estimated.
- the distribution unit may not transmit the packet over a predetermined period when the signal indicating that the mobile network is in congestion is received from the portable terminal.
- the cache server divides and receives the file of the requested content from the content temporary storage unit, and the bit rate of the stream extracted from the divided file does not exceed the bandwidth.
- a stream may be generated by deleting low priority frames from the stream.
- the cache server receives from the portable terminal a response packet to the transmission packet transmitted to the portable terminal, a difference between the transmission time of the transmission packet and the reception time of the response packet; And, according to the size of the transmission packet, the bandwidth of the mobile network may be estimated.
- the cache server may not send out the packet for a predetermined period when the signal indicating that the mobile network is in congestion is received from the portable terminal. .
- [Form 15] A process of temporarily storing at least a part of the content held by the distribution server device for distributing the content over the Internet in a content temporary storage unit provided therein; A process of determining, from among a plurality of cache servers provided on the mobile network, a cache server storing content requested by the portable terminal using information contained in a content request message from the portable terminal; , A process of reading the file of the requested content from the determined cache server and outputting the file to the temporary content storage unit; Estimating the bandwidth of the mobile network based on predetermined signals from the mobile terminal; Reading the file of the requested content from the content temporary storage unit; A process of generating a stream in which a part of frames are deleted from the stream so that the bit rate of the stream extracted from the read file does not exceed the band, storing the generated stream in a packet and sending it to the mobile terminal And a program that causes a computer provided in the cache server to execute the program.
- the program may be provided as a program product recorded in a non-transient computer readable recording medium.
- the file of the requested content is divided and received from the temporary content storage unit, and the bit rate of the stream extracted from the divided file is prioritized from the stream so as not to exceed the bandwidth.
- the computer may be made to execute a process of generating a stream in which less frequent frames are deleted.
- the computer when a response packet to the transmission packet transmitted to the portable terminal is received from the portable terminal, the difference between the transmission time of the transmission packet and the reception time of the response packet, and the size of the transmission packet In response to this, the computer may be caused to execute the process of estimating the bandwidth of the mobile network.
- the computer is caused to execute processing for preventing the packet from being sent out for a predetermined period. May be
- FIGS. 1 to 6 The configuration and operation of the content distribution system according to the embodiment will be described in detail with reference to FIGS. 1 to 6.
- a configuration in the case where the content is a moving image is shown.
- FIG. 1 is a diagram showing an example of the configuration of a content distribution system according to the present embodiment.
- the content distribution system includes a distribution server apparatus 121 on the Internet 145, and on a mobile network 150, serving GPRS Support Node (SGSN) / Gateway GPRS Support Node (GGSN) apparatuses 190_1 to 190_N, cache server 110_1 to 110_N, RNC (Radio Network Controller) devices 195_1 to 195_L, 197_1 to 197_L, and base station devices 180_1 to 180_M, 181_1 to 181_M, 182_1 to 182_M, and 183_1 to 183_M.
- SGSN serving GPRS Support Node
- GGSN Gateway GPRS Support Node
- RNC Radio Network Controller
- FIG. 1 shows a configuration in which a 3G mobile packet network is used as a mobile network and an SGSN / GGSN apparatus is used as a packet transfer apparatus. Further, FIG. 1 shows a configuration using a cache server.
- the distribution server apparatus 121 on the Internet 145 stores various contents on the Internet. In the following description, these contents are also referred to as OTT (Over The Top) contents.
- the content is a compressed encoded bit stream of moving image content or a file storing the compressed encoded bit stream.
- the portable terminal 170 is used as a terminal. However, terminals other than the portable terminal 170 can be used as the terminals.
- N N (N ⁇ 2) SGSN / GGSN apparatuses 190_1 to 190_N are deployed.
- RNC devices 195_1 to 195_L L ⁇ 2) are connected to the SGSN / GGSN device 190_1.
- RNC devices 197_1 to 197_L are connected to the SGSN / GGSN device 190_N.
- L RNC devices are connected to the SGSN / GGSN device 190_2, they are omitted in FIG. 1 for the sake of space.
- M (M ⁇ 2) base station apparatuses are connected to one RNC apparatus.
- M base station apparatuses 180_1 to 180_M are connected to the RNC apparatus 195_1.
- one cache server is connected to the GGSN function unit of each SGSN / GGSN apparatus.
- the cache server 110_1 is connected to the SGSN / GGSN apparatus 190_1.
- the SGSN / GGSN apparatus means that the SGSN functional unit and the GGSN functional unit have an apparatus configuration installed in the same place.
- the portable terminal 170 describes the URL (Uniform Resource Locator) of the requested content and issues a delivery connection request message. Then, the base station apparatus (one of the base station apparatuses 181_1 to 181_M in the case of FIG. 1) in which the portable terminal 170 is located receives the connection request message and controls the RNC apparatus that manages the base station apparatus. A connection request message is sent to the RNC device 195_L in the case of FIG.
- the RNC device 195_L receives a connection request message from the base station device, and receives a connection request message, an IP (Internet Protocol) address of the distribution server device 121, an IP address of the mobile terminal 170, etc.
- IP Internet Protocol
- GPRS General Packet Radio Service Tunneling (Protocol)
- the GTP packet is transferred to the SGSN / GGSN device 190_1 which is stored in the payload portion of the packet and which integrates the RNC devices 195_1 to 195_L.
- the SGSN / GGSN apparatus 190_1 receives the GTP packet.
- the cache server 110_1 is connected to, for example, the Gi interface of the GGSN function unit of the SGSN / GGSN apparatus 190_1.
- the cache server 110_N is connected to the Gi interface of the GGSN function part of the SGSN / GGSN device 190_N.
- the cache servers 110_1 to 110_N are connected to one another so that cooperation of contents can be performed.
- FIG. 2 is a block diagram showing an example of the configuration of the cache server 110_1.
- the configurations of the cache servers 110_2 to 110_N other than the cache server 110_1 are the same as the configuration of the cache server 110_1, and thus the description thereof is omitted.
- the cache server 110_1 includes a control signal transmission / reception unit 111, an analysis unit 115, a collection unit 116, a determination unit 117, a content securing unit 112, a content temporary storage unit 113, a content list creation unit 118, and a distribution unit. It has 114.
- the control signal transmission / reception unit 111 receives, from the SGSN / GGSN apparatus 190_1, a GTP packet storing the connection request message from the portable terminal 170, the received IP address of the portable terminal 170, the URL of the requested content, and the like. Further, the control signal transmission / reception unit 111 receives the service area information of the mobile terminal 170 from the SGSN / GGSN apparatus 190_1.
- the analysis unit 115 reads the content of the connection request message stored in the payload portion of the GTP packet, extracts information such as the reception IP address of the portable terminal 170, the URL of the requested content, and the URL of the requested content, The reception IP address and the like of the portable terminal 170 are output to the distribution unit 114 and the determination unit 117.
- the collection unit 116 inputs the content list of the content stored in the cache server 110_1 and the content list of the content stored in the cache servers 110_2 to 110_N other than the cache server 110_1, and outputs the content list to the determination unit 117.
- the collection unit 116 may perform collection of the content list at predetermined time intervals, or may perform when there is a connection request from the portable terminal 170, or another cache server It may be performed when there is a collection request from 110_2 to 110_N.
- the determination unit 117 stores the received IP address of the portable terminal 170, information such as the URL of the requested content, the content list of the content stored in the cache server 110_1, and the cache servers 110_2 to 110_N other than the cache server 110_1.
- the content list of contents is input.
- the determination unit 117 determines whether the content requested by the portable terminal 170 is stored in the cache server 110_1 or whether the cache servers 110_2 to 110_N other than the cache server 110_1 are stored.
- the determination unit 117 instructs the content temporary storage unit 113 and the distribution unit 114 to read and distribute.
- the determination unit 117 instructs the content securing unit 112 the URL of the requested content, The IP address of the stored cache server is transmitted, and the cooperation between the cache servers is instructed to secure the content from the cache server.
- the determination unit 117 determines the content from the distribution server device 121.
- the content securing unit 112 is instructed to secure the content.
- the content securing unit 112 receives the URL of the content requested from the determining unit 117, the content securing instruction, the IP address of the cache server in the case of another cache server, and the IP of the distribution server device 121 in the case of the distribution server device 121. Address is input.
- the content securing unit 112 secures a copy of the requested content and outputs it to the content temporary storage unit 113.
- Content temporary storage unit 113 stores the content output from content securing unit 112.
- the content temporary storage unit 113 receives a content read instruction from the determination unit 117, the content temporary storage unit 113 reads out the content file corresponding to the URL of the requested content, and outputs the read content file to the distribution unit 114.
- the content list creation unit 118 creates a list of all the content stored in the content temporary storage unit 113 at any time, and when a request is made from another cache server at predetermined time intervals, or When the collection unit 116 makes a request, the content list is output.
- the distribution unit 114 inputs the URL information of the requested content from the analysis unit 115 and also inputs the distribution instruction of the content from the determination unit 117.
- the distribution unit 114 reads the file of the requested content from the content temporary storage unit 113, generates a packet of a predetermined protocol (for example, TCP (Transmission Control Protocol)), and sends it to the SGSN / GGSN apparatus 190_1.
- TCP Transmission Control Protocol
- the SGSN / GGSN apparatus 190_1 delivers the packet including the content to the mobile terminal 170.
- FIG. 3 is a block diagram showing the configuration of distribution unit 114 as an example.
- the distribution unit 114 includes a reception unit 201, a band estimation unit 202, a content acquisition unit 203, a selection adjustment unit 204, and a transmission unit 200.
- the receiving unit 201 receives a packet of a TCP response signal (for example, a packet of a TCP Ack signal) from the portable terminal 170 via the SGSN / GGSN apparatus, and outputs information of the TCP response signal packet to the band estimation unit 202.
- a TCP response signal for example, a packet of a TCP Ack signal
- ECN Explicit Congestion Notification
- the band estimation unit 202 receives the information of the transmission packet transmitted from the transmission unit 200 (for example, the transmission time of the transmission packet and the size of the transmission packet) and the information of the TCP response signal packet.
- the band estimation unit 202 measures the response time T n from equation (1) by associating the transmission packet with the TCP response signal packet using the number of the transmission packet.
- T n T n ack -T n send (1)
- T n represents the response time of the n-th packet
- T n ack represents the time when the n-th TCP response signal packet was received by the reception unit 201
- T n send represents the transmission unit of the n-th transmission packet It represents the time of transmission at 200.
- the band estimation unit 202 estimates the band B n in the n-th packet from the equations (2) and (3), where the size of the n-th transmission packet is S n .
- ⁇ is a predetermined constant that satisfies 0 ⁇ ⁇ 1.
- the band estimation unit 202 may perform the calculations of the equations (2) and (3) at predetermined time intervals, or when the content acquisition unit 203 makes a request. You may
- the band estimation unit 202 outputs the band B n estimated by Equation (3) to the selection adjustment unit 204 every predetermined time interval T or every time when there is a request from the selection adjustment unit 204.
- the bandwidth estimation unit 202 determines that the mobile network is in a congested state, and reduces the bandwidth B n estimated by Equation (2) by a predetermined amount.
- the content acquisition unit 203 inputs the URL of the content requested from the analysis unit 115 of FIG. 2, and inputs the content distribution instruction from the determination unit 117 of FIG. 2, and the content temporary of FIG.
- the storage unit 113 is searched, the corresponding file or stream and bit rate information K are acquired, and these are output to the selection adjustment unit 204.
- the selection adjustment unit 204 inputs the band B n from the band estimation unit 202, and the file of the content of the requested URL from the content acquisition unit 203 is for a predetermined time length ⁇ (in seconds), or , Divided and input by a predetermined size G (unit: byte). Furthermore, the selection adjustment unit 204 inputs the bit rate K (unit: bps) of the content from the content acquisition unit 203. The selection adjustment unit 204 sets the bit rate K ′ (unit: bps), for example, as in the process described below, so that the bit rate of the stream extracted from the file divided and input does not exceed the estimated band B n. Are output to the transmitting unit 200.
- ⁇ is 2 seconds
- the selection adjustment unit 204 divides the file every 2 seconds from the content acquisition unit 203 and inputs it.
- the selection adjustment unit 204 extracts the stream from the file that has been divided and input, reads the header portion from the stream, and the picture type of the stream header is I picture (Intra Coded Picture) It is determined which of P picture (Predictive Coded Picture) and B picture (Bidirectional Predictive Coded Picture).
- the selection adjustment unit 204 generates a stream in which the frames are deleted in order from the frame with low priority, and calculates the bit rate K ′.
- the B picture and the P picture are in the order of low priority.
- the selection adjustment unit 204 calculates the bit rate K ′ according to equation (4).
- K ' K- ⁇ j B j (4)
- Equation (4) B j is the bit rate of the j-th B picture included in the stream of the divided file.
- the selection adjustment unit 204 compares the magnitude of the bit rate K ′ with the band B n .
- the selection adjustment unit 204 When K ′ ⁇ B n , the selection adjustment unit 204 outputs the stream after deleting the B picture from the stream of the divided file according to the above process to the transmission unit 200.
- the selection adjustment unit 204 creates a stream from which the remaining B pictures are deleted, and the bit is calculated by equation (5). After calculating the rate K ′, the magnitude of the bit rate K ′ and the band B n are compared again.
- the selection adjustment unit 204 creates a stream in which the P picture is deleted from the stream, calculates the bit rate K ′ from the equation (6), and then performs the bit calculation again. The magnitudes of the rate K ′ and the band B n are compared.
- K ' K'- ⁇ i P i (6)
- P i represents the bit rate of the i-th P picture included in the divided stream.
- the selection adjustment unit 204 When K ′ ⁇ B n is obtained by the above processing, the selection adjustment unit 204 outputs the stream created in the above processing to the transmission unit 200.
- the transmitting unit 200 inputs a stream whose bit rate has been adjusted by the divided file output from the selection adjusting unit 204, stores the stream in a TCP packet, and uses the SGSN / GGSN device 190_1, the RNC device, and the base station device. It sends to the portable terminal 170 via.
- FIG. 1 the structure in the case of connecting one cache server with respect to one SGSN / GGSN apparatus was shown.
- one cache server may be connected to a plurality of SGSN / GGSN devices.
- multiple cache servers may be connected to one SGSN / GGSN apparatus.
- the distribution server device 121 may be connected to the cache server devices 110_1 to 110_N.
- FIG. 1 shows a configuration in the case of using an SGSN / GGSN apparatus in which an SGSN apparatus and a GGSN apparatus are integrated.
- a configuration in which the SGSN device and the GGSN device are separated may be employed.
- at least one cache server can be connected to either the SGSN device or the GGSN device.
- the distribution unit 114 may estimate the bandwidth based on equations other than Equation (2) and Equation (3). Also, the distribution unit 114 may adjust the bit rate based on a scheme other than the above.
- the mobile terminal 170 may be any of a mobile phone, a smartphone, a tablet, and a PC equipped with a data communication card.
- the portable terminal 170 may be any other terminal as long as it can communicate with the mobile 3G network.
- FIG. 4 is a block diagram showing an example of the configuration of the content distribution system according to the present embodiment.
- proxy servers 120_1 to 120_N are used instead of the cache servers 110_1 to 110_N.
- the components given the same reference numerals as in FIG. 1 perform the same operations as in FIG.
- proxy servers 120_1 to 120_N two types, transparent and completely transparent, can be considered.
- the proxy server 120_1 will be described.
- the operations of the proxy servers 120_2 to 120_N other than the proxy server 120_1 are the same as the operations of the proxy server 120_1, and thus the description thereof is omitted.
- the proxy server 120_1 temporarily terminates the message signal from the portable terminal 170 and analyzes the message signal.
- the proxy server 120_1 distributes the content temporarily stored in the proxy server 120_1 from the proxy server 120_1 to the portable terminal 170.
- the proxy server 120_1 makes a request or access to the distribution server apparatus 121 via the SGSN / GGSN apparatus 190_1 as necessary.
- the proxy server 120_1 does not change the URL of the requested content included in the request signal from the portable terminal 170, the IP address of the distribution server apparatus 121 on the Internet, the IP address of the portable terminal 170, and the like.
- the proxy server 120_1 uses DPI (Deep Packet Inspection) technology to check the header portion of the packet without terminating the signal from the portable terminal 170, and requests the URL of the requested content, the IP address of the portable terminal 170, etc.
- DPI Deep Packet Inspection
- the proxy server 120_1 instructs the distribution server device 121 to stop the distribution via the SGSN / GGSN device 190_1, and then sends the requested content. It distributes from the proxy server 120_1.
- the configuration of the proxy server 120_1 is the same as the configuration (FIG. 2) of the cache server 110_1 in the first embodiment, and thus detailed description will be omitted.
- FIG. 5 is a block diagram showing an example of the configuration of the content distribution system according to the present embodiment.
- LTE Long Term Evolution
- EPC Evolved Packet Core
- an S / P-GW (Serving / Packet Data-Gateway) apparatus is connected to the eNodeB apparatus.
- the S / P-GW apparatus means that the S-GW apparatus and the P-GW apparatus are integrated.
- FIG. 5 shows a configuration in which M eNodeB apparatuses are connected to one S / P-GW apparatus.
- eNodeB devices 260_1 to 260_M are connected to the S / P-GW device 290_1.
- One cache server is connected to each S / P-GW apparatus.
- a cache server 410_1 is connected to the S / P-GW apparatus 290_1.
- the cache servers 410_1 to 410_N are connected to one another so that the contents can be linked.
- the portable terminal 170 describes the IP address of the distribution server apparatus 121 and issues a distribution connection request message. Then, the eNodeB apparatus (one of the eNodeB apparatuses 261_1 to 261_M in the case of FIG. 5) in which the portable terminal 170 is located receives the connection request message. One of the eNodeB devices 261_1 to 261M stores the connection request message, the IP address of the distribution server device 121, the IP address of the portable terminal 170, etc. in the payload part of the GTP protocol, Forward.
- the cache server 410_1 has the same configuration as the cache server 110_1 (FIG. 2) in the first embodiment.
- the connection destination of the control signal transmission / reception unit 111 is the S / P-GW apparatus 290_1. Therefore, the control signal transmission / reception unit 111 receives, from the S / P-GW apparatus 290_1, the connection request message from the portable terminal 170, the GTP packet storing the IP address and the like, and the location information of the portable terminal 170.
- the other cache servers 410_2 to 410_N also exchange the above with the S / P-GW apparatuses 290_2 to 290_N connected thereto.
- FIG. 5 shows a configuration using an S / P-GW apparatus in which an S-GW apparatus and a P-GW apparatus are integrated.
- a configuration in which the S-GW apparatus and the P-GW apparatus are separated can also be used.
- at least one cache server can be connected to either the S-GW apparatus or the P-GW apparatus.
- the mobile terminal 170 may be any of a mobile phone, a smartphone, and a PC equipped with a data communication card.
- the portable terminal 170 may be any other terminal as long as it can communicate with a mobile 3.9G (3.9th Generation) network.
- FIG. 6 is a block diagram showing an example of the configuration of the content distribution system according to the present embodiment.
- FIG. 6 shows a configuration in which the cache server is replaced with a proxy server in FIG.
- the operation of the content distribution system in this case is the same as the operation of the content distribution system of the second embodiment, so the description will be omitted.
- the content delivery system according to the first to fourth embodiments provides, for example, the following effects.
- the bandwidth (throughput) of the mobile network fluctuates temporally with the traffic volume, and the bandwidth falls below the delivery bit rate. Even if the time continues, the bandwidth is estimated based on the TCP response signal or the ECN notification signal, and the video frames with low priority are sequentially ordered from the low priority so that the bit rate of the stream extracted from the file of divided part does not exceed the estimated bandwidth. After discarding the frame, store the adjusted stream in a TCP packet and send it out. According to such a content delivery system, it is possible to solve the problem that the moving image being played back on the client is frozen or the sound is interrupted. Also, this can significantly improve the viewer's QoE (Quality of Experience).
- QoE Quality of Experience
- FIG. 7 is a diagram showing an example of the configuration of the content distribution system according to the present embodiment.
- the content distribution system includes a distribution server apparatus 121 on the Internet 145, and on a mobile network 150, serving GPRS Support Node (SGSN) / Gateway GPRS Support Node (GGSN) apparatuses 190_1 to 190_N, cache server 110_1 to 110_N, RNC (Radio Network Controller) devices 195_1 to 195_L, 197_1 to 197_L, and base station devices 180_1 to 180_M, 181_1 to 181_M, 182_1 to 182_M, and 183_1 to 183_M.
- SGSN serving GPRS Support Node
- GGSN Gateway GPRS Support Node
- RNC Radio Network Controller
- FIG. 7 shows a configuration in which a 3G mobile packet network is used as a mobile network and an SGSN / GGSN apparatus is used as a packet transfer apparatus. Further, FIG. 7 shows a configuration using a cache server.
- the distribution server apparatus 121 on the Internet 145 stores various contents on the Internet. In the following description, these contents are also referred to as OTT (Over The Top) contents.
- the content is a compressed encoded bit stream of moving image content or a file storing the compressed encoded bit stream.
- the portable terminal 170 is used as a terminal. However, terminals other than the portable terminal 170 can be used as the terminals.
- N N (N ⁇ 2) SGSN / GGSN apparatuses 190_1 to 190_N are deployed.
- RNC devices 195_1 to 195_L L ⁇ 2) are connected to the SGSN / GGSN device 190_1.
- RNC devices 197_1 to 197_L are connected to the SGSN / GGSN device 190_N.
- L RNC devices are also connected to the SGSN / GGSN device 190_2, they are omitted in FIG. 7 for the sake of space.
- M (M ⁇ 2) base station apparatuses are connected to one RNC apparatus.
- M base station apparatuses 180_1 to 180_M are connected to the RNC apparatus 195_1.
- one cache server is connected to the GGSN function unit of each SGSN / GGSN apparatus.
- the cache server 110_1 is connected to the SGSN / GGSN apparatus 190_1.
- the SGSN / GGSN apparatus means that the SGSN functional unit and the GGSN functional unit have an apparatus configuration installed in the same place.
- the portable terminal 170 describes the URL (Uniform Resource Locator) of the requested content and issues a delivery connection request message. Then, the base station apparatus (one of the base station apparatuses 181_1 to 181_M in the case of FIG. 7) in which the portable terminal 170 is located receives the connection request message and controls the RNC apparatus that manages the base station apparatus. A connection request message is sent to the RNC device 195_L in the case of FIG.
- URL Uniform Resource Locator
- the RNC device 195_L receives a connection request message from the base station device, and receives a connection request message, an IP (Internet Protocol) address of the distribution server device 121, an IP address of the mobile terminal 170, etc.
- IP Internet Protocol
- GPRS General Packet Radio Service Tunneling (Protocol)
- the GTP packet is transferred to the SGSN / GGSN device 190_1 which is stored in the payload portion of the packet and which integrates the RNC devices 195_1 to 195_L.
- the SGSN / GGSN apparatus 190_1 receives the GTP packet.
- the cache server 110_1 is connected to, for example, the Gi interface of the GGSN function unit of the SGSN / GGSN apparatus 190_1.
- the cache server 110_N is connected to the Gi interface of the GGSN function part of the SGSN / GGSN device 190_N.
- the cache servers 110_1 to 110_N are connected to one another so that cooperation of contents can be performed.
- FIG. 8 is a block diagram showing an example of the configuration of the cache server 110_1.
- the configurations of the cache servers 110_2 to 110_N other than the cache server 110_1 are the same as the configuration of the cache server 110_1, and thus the description thereof is omitted.
- the cache server 110_1 includes a control signal transmission / reception unit 111, an analysis unit 115, a collection unit 116, a determination unit 117, a content securing unit 112, a content temporary storage unit 113, a content list creation unit 118, and a distribution unit. It has 114.
- the control signal transmission / reception unit 111 receives, from the SGSN / GGSN apparatus 190_1, a GTP packet storing the connection request message from the portable terminal 170, the received IP address of the portable terminal 170, the URL of the requested content, and the like. Further, the control signal transmission / reception unit 111 receives the service area information of the mobile terminal 170 from the SGSN / GGSN apparatus 190_1.
- the analysis unit 115 reads the content of the connection request message stored in the payload portion of the GTP packet, extracts information such as the reception IP address of the portable terminal 170, the URL of the requested content, and the URL of the requested content, The reception IP address and the like of the portable terminal 170 are output to the distribution unit 114 and the determination unit 117.
- the collection unit 116 inputs the content list of the content stored in the cache server 110_1 and the content list of the content stored in the cache servers 110_2 to 110_N other than the cache server 110_1, and outputs the content list to the determination unit 117.
- the collection unit 116 may perform collection of the content list at predetermined time intervals, or may perform when there is a connection request from the portable terminal 170, or another cache server It may be performed when there is a collection request from 110_2 to 110_N.
- the determination unit 117 stores the received IP address of the portable terminal 170, information such as the URL of the requested content, the content list of the content stored in the cache server 110_1, and the cache servers 110_2 to 110_N other than the cache server 110_1.
- the content list of contents is input.
- the determination unit 117 determines whether the content requested by the portable terminal 170 is stored in the cache server 110_1 or whether the cache servers 110_2 to 110_N other than the cache server 110_1 are stored.
- the determination unit 117 instructs the content temporary storage unit 113 and the distribution unit 114 to read and distribute.
- the discrimination unit 117 accumulates the URL of the requested content with respect to the content securing unit 112 and The IP address of the existing cache server is transmitted, and the cooperation between the cache servers is instructed to secure the content from the cache server.
- the determination unit 117 determines the content from the distribution server device 121.
- the content securing unit 112 is instructed to secure the content.
- the content securing unit 112 receives the URL of the content requested from the determining unit 117, the content securing instruction, the IP address of the cache server in the case of another cache server, and the IP of the distribution server device 121 in the case of the distribution server device 121. Input address.
- the content securing unit 112 secures a copy of the requested content and outputs it to the content temporary storage unit 113.
- Content temporary storage unit 113 stores the content output from content securing unit 112. Further, when the content temporary storage unit 113 receives a content read instruction from the determination unit 117, the content temporary storage unit 113 reads out the content file corresponding to the requested content and outputs the read content file to the distribution unit 114.
- the content list creation unit 118 creates a list of all the content stored in the content temporary storage unit 113 at any time, and when a request is made from another cache server at predetermined time intervals, or When the collection unit 116 makes a request, the content list is output.
- FIG. 9 is a block diagram showing the configuration of distribution unit 114 as an example.
- the distribution unit 114 includes a reception unit 201, a band estimation unit 202, a content acquisition unit 203, a selection adjustment unit 204, a transmission timing control unit 205, and a transmission unit 200.
- the receiving unit 201 receives a packet of a Transmission Control Protocol (TCP) response signal (for example, a packet of a TCP Ack signal) from the portable terminal 170 via the SGSN / GGSN apparatus, and transmits the information of the TCP response signal packet to the band estimation unit 202. Output.
- TCP Transmission Control Protocol
- the receiving unit 201 receives an ECN (Explicit Congestion Notification) signal for notifying a congestion state from the portable terminal 170, the receiving unit 201 instructs the band estimation unit 202 to rapidly reduce the band. You may put it out.
- the bandwidth estimation unit 202 includes information of the transmission packet transmitted from the transmission unit 200 (for example, transmission time of the nth transmission packet and packet size), information of the TCP response signal packet (for example, reception time of the nth packet) Is an input.
- the band estimation unit 202 measures the response time T n from equation (1) by associating the transmission packet with the TCP response signal packet using the number of the transmission packet.
- T n T n ack -T n send (1)
- T n represents the response time of the n-th packet
- T n ack represents the time when the n-th TCP response signal packet was received by the reception unit 201
- T n send represents the transmission unit of the n-th transmission packet It represents the time of transmission at 200.
- the band estimation unit 202 sets the size of the nth transmission packet as S n (unit: byte), and estimates the band B n in the nth packet from Expression (2) and Expression (3).
- ⁇ is a predetermined constant that satisfies 0 ⁇ ⁇ 1.
- the band estimation unit 202 may perform the calculations of Equations (2) and (3) at predetermined time intervals, or at the timing when the reception unit 201 receives a TCP response. You may do so.
- the band estimation unit 202 outputs the band B n estimated by Equation (3) to the selection adjustment unit 204 every predetermined time interval T or every time when there is a request from the selection adjustment unit.
- the bandwidth estimation unit 202 determines that the mobile network is in a congested state, and reduces the bandwidth B n estimated by Equation (2) by a predetermined amount.
- the content acquisition unit 203 inputs information of the content requested from the analysis unit 115 of FIG. 8, inputs a content distribution instruction from the determination 117 of FIG. 8, and temporarily stores the content of FIG. 8 for the requested content file.
- the unit 113 is searched, the corresponding file or stream and bit rate information K are acquired, and these are output to the selection adjustment unit 204.
- the selection adjustment unit 204 inputs the band B n from the band estimation unit 202 at predetermined time intervals, and the file of the content requested from the content acquisition unit 203 has a predetermined time length ⁇ (unit Is divided and input by seconds). Furthermore, the selection adjustment unit 204 calculates the bit rate K of the divided portion according to Expression (4) from the size S d (unit is a bit) of the file divided and input and the time length ⁇ .
- the selection adjustment unit 204 determines whether the bit rate K exceeds the estimated band B n .
- the selection adjustment unit 204 performs processing such that the adjusted bit rate K ′ does not exceed the band B n by discarding the moving image frame with low priority.
- the divided file after adjustment is output to the transmitting unit 200.
- An example of adjustment by the selection adjustment unit 204 is shown below. Here, as an example, it is assumed that ⁇ is 2 seconds, and the selection adjustment unit 204 divides and inputs the file from the content acquisition unit 203 every 2 seconds.
- the selection adjustment unit 204 extracts the stream from the divided file, reads the header from the stream, and the picture type of the stream header is I picture (Intra Coded Picture), P picture (P It is determined whether the picture is a Predictive Coded Picture) or a B picture (Bidirectional Predictive Coded Picture).
- the selection adjustment unit 204 generates a stream in which the frames are deleted in order from the frame with low priority, and calculates the bit rate K ′.
- the B picture and the P picture are in the order of low priority.
- the selection adjustment unit 204 calculates the bit rate K ′ by equation (5).
- K ' K- ⁇ j B j (5)
- B j is the bit rate of the j-th B picture included in the stream of the divided file.
- the selection adjustment unit 204 stores the stream after the process of Expression (5) in the file again, and then outputs the stream to the transmission timing control unit 205.
- the selection adjustment unit 204 creates a stream from which the remaining B pictures are deleted, and the bit is calculated by equation (6). After calculating the rate K ′, the magnitude of the bit rate K ′ and the band B n are compared again.
- K ' K'- ⁇ m B m (6)
- the selection adjustment unit 204 creates a stream in which the P picture is deleted from the stream, calculates the bit rate K ′ by the equation (7), and then re-executes the bit calculation. The magnitudes of the rate K ′ and the band B n are compared.
- P i represents the bit rate of the i-th P picture included in the divided stream.
- the selection adjustment unit 204 stores the stream created by these processing in the file again, and then performs transmission timing control. Output to the unit 205.
- the transmission timing control unit 205 receives the band B n from the band estimation unit 202, receives the bit rate K ′ from the selection adjustment unit 204, and is a divided file so that the bit rate K ′ does not exceed the band B n.
- the file after the adjustment is input from the selection adjustment unit 204, and the transmission timing of the file is controlled, for example, as follows.
- the transmission timing control unit 205 When K ′ ⁇ B n , the transmission timing control unit 205 outputs the input file to the transmission unit 200 during the time interval T1 in which the buffer capacity L of the portable terminal 170 is filled.
- the time interval T1 is given by equation (8).
- time interval T is a time interval in which the data of the buffer capacity L of the portable terminal 170 does not become empty during the time interval T ⁇ T1 and T> T1.
- the transmission timing control unit 204 does not output the input file to the transmission unit 200 during a predetermined time interval T2.
- the time interval T2 is a time interval in which the data of the buffer capacity L of the portable terminal 170 does not become empty.
- the maximum value of the time interval T2 is given by equation (9).
- bit rate B p indicates the bit rate when playing back a moving image on the mobile terminal 170.
- transmitting section 200 stores the content in a TCP packet and transmits portable terminal 170 via SGSN / GGSN apparatus 190_1, RNC apparatus and base station apparatus. Send to On the other hand, the transmitting unit 200 does not transmit the TCP packet during the time interval T-T1 and during the time interval T2. The transmission unit 200 outputs a size S n of the transmitted n-th packet to the band estimating unit 202.
- FIG. 7 the structure in the case of connecting one cache server with respect to one SGSN / GGSN apparatus was shown.
- one cache server may be connected to a plurality of SGSN / GGSN devices.
- multiple cache servers may be connected to one SGSN / GGSN apparatus.
- the distribution server device 121 may be connected to the cache server devices 110_1 to 110_N.
- FIG. 7 shows a configuration in the case of using an SGSN / GGSN apparatus in which an SGSN apparatus and a GGSN apparatus are integrated.
- a configuration in which the SGSN device and the GGSN device are separated may be employed.
- at least one cache server is connected to either the SGSN device or the GGSN device.
- the distribution unit 114 may also estimate the bandwidth using an equation other than Equation (2) and Equation (3). Another method can be used as the bit rate adjustment method in the selection adjustment unit 204. Further, as a control method of transmission timing in the transmission timing control unit 205, another method can be used.
- the transmission timing control unit 205 may control transmission timing in at least a part of a period (time interval), and may not control transmission timing in the other periods.
- the mobile terminal 170 may be any of a mobile phone, a smartphone, a tablet, and a PC equipped with a data communication card. Also, the mobile terminal 170 may be any other terminal as long as it can communicate with the mobile 3G network.
- FIG. 10 is a block diagram showing an example of the configuration of the content distribution system according to the present embodiment.
- proxy servers 120_1 to 120_N are used instead of the cache servers 110_1 to 110_N.
- the components given the same reference numerals as in FIG. 7 operate in the same way as in FIG.
- proxy servers 120_1 to 120_N two types, transparent and completely transparent, can be considered.
- the proxy server 120_1 will be described.
- the operations of the proxy servers 120_2 to 120_N other than the proxy server 120_1 are the same as the operations of the proxy server 120_1, and thus the description thereof is omitted.
- the proxy server 120_1 temporarily terminates the message signal from the portable terminal 170 and analyzes the message signal.
- the proxy server 120_1 delivers the content temporarily stored in the proxy server 120_1 from the proxy server 120_1 to the portable terminal 170.
- the proxy server 120_1 makes a request or access to the distribution server apparatus 121 via the SGSN / GGSN apparatus 190_1 as necessary.
- the proxy server 120_1 does not change the URL of the requested content included in the request signal from the portable terminal 170, the IP address of the distribution server apparatus 121 on the Internet 145, the IP address of the portable terminal 170, and the like.
- the proxy server 120_1 uses DPI (Deep Packet Inspection) technology to check the header portion of the packet without terminating the signal from the portable terminal 170, and requests the URL of the requested content, the IP address of the portable terminal 170, etc.
- DPI Deep Packet Inspection
- the proxy server 120_1 Extract information of If the requested content is cached in the proxy server 120_1, the proxy server 120_1 issues a distribution stop instruction to the distribution server device 121 via the SGSN / GGSN device 190_1, and then the requested content. Are distributed from the proxy server 120_1.
- the configuration of the proxy server 120_1 is the same as the configuration (FIG. 8) of the cache server 110_1 in the fifth embodiment, and thus detailed description will be omitted.
- FIG. 11 is a block diagram showing an example of the configuration of the content distribution system according to the present embodiment.
- the mobile network 250 instead of the 3G mobile network 150 shown in FIG. ) Use the network 250.
- LTE Long Term Evolution
- the functions of a base station apparatus and an RNC apparatus are degenerated, and only eNodeB (evolved Node B) apparatuses are used.
- an S / P-GW (Serving / Packet Data-Gateway) apparatus is connected to the eNodeB apparatus.
- the S / P-GW apparatus means that the S-GW apparatus and the P-GW apparatus are integrated.
- FIG. 11 shows a configuration in which M eNodeB apparatuses are connected to one S / P-GW apparatus.
- eNodeB devices 260_1 to 260_M are connected to the S / P-GW device 290_1.
- One cache server is connected to each S / P-GW apparatus.
- a cache server 410_1 is connected to the S / P-GW apparatus 290_1.
- the cache servers 410_1 to 410_N are connected to one another so that the contents can be linked.
- the portable terminal 170 describes the IP address of the distribution server apparatus 121 and issues a distribution connection request message. Then, the eNodeB apparatus (one of the eNodeB apparatuses 261_1 to 261_M in the case of FIG. 11) in which the portable terminal 170 is located receives the connection request message. One of the eNodeB devices 261_1 to 261M stores the connection request message, the IP address of the distribution server device 121, the IP address of the portable terminal 170, etc. in the payload part of the GTP protocol, Forward.
- the cache server 410_1 has the same configuration as the cache server 110_1 (FIG. 8) in the fifth embodiment.
- the connection destination of the control signal transmission / reception unit 111 is the S / P-GW apparatus 290_1. Therefore, the control signal transmission / reception unit 111 receives, from the S / P-GW apparatus 290_1, the connection request message from the portable terminal 170, the GTP packet storing the IP address and the like, and the location information of the portable terminal 170.
- the other cache servers 410_2 to 410_N also perform the above-described exchange with the S / P-GW apparatuses 290_2 to 290_N connected thereto.
- FIG. 11 shows a configuration using an S / P-GW apparatus in which an S-GW apparatus and a P-GW apparatus are integrated. However, a configuration in which the S-GW apparatus and the P-GW apparatus are separated can also be used. In this configuration, at least one cache server is connected to either the S-GW apparatus or the P-GW apparatus.
- the mobile terminal 170 may be any of a mobile phone, a smartphone, and a PC equipped with a data communication card.
- the portable terminal 170 may be any other terminal as long as it can communicate with the mobile 3.9G network.
- FIG. 12 is a block diagram showing an example of the configuration of the content distribution system according to the present embodiment.
- FIG. 12 shows a configuration in which the cache server is replaced with a proxy server in the content delivery system (FIG. 11) according to the seventh embodiment.
- the operation of the content distribution system in this case is the same as the operation of the content distribution system according to the sixth embodiment, so the description will be omitted.
- the content delivery system according to the first to eighth embodiments provides, for example, the following effects.
- a band is estimated based on a TCP response signal or an ECN notification signal, and a stream extracted from the file of the division After discarding frames in order from a video frame with lower priority so that the bit rate of the above does not exceed the estimated bandwidth, the stream after adjustment is stored in a TCP packet and sent out.
- the bandwidth (throughput) of the mobile network fluctuates in time due to the traffic volume, and even if the bandwidth continues below the delivery bit rate, the video being played on the client may freeze or sound may It is possible to solve the problem of interruption or the like. This can also significantly improve the viewer's Quality of Experience (QoE).
- QoE Quality of Experience
- the transmission timing control unit controls transmission timing so as not to exceed the band or the buffer capacity using the estimated value of the band of the mobile network and the estimated value of the buffer amount of the portable terminal. Therefore, even future data that is not necessary for the viewer's current viewing will not be delivered, and even if the viewer stops viewing on the way, the data that has already been delivered is appropriate from the estimated bandwidth It will be delivery of quantity. At this time, it is possible to avoid the problem that the excessive amount of data is distributed as in the conventional content distribution system, and the limited bandwidth of the mobile network is unnecessarily consumed.
Abstract
Description
本発明は、日本国特許出願:特願2011-205465号(2011年 9月21日出願)及び特願2011-205466号(2011年 9月21日出願)の優先権主張に基づくものであり、同出願の全記載内容は引用をもって本書に組み込み記載されているものとする。
本発明は、コンテンツ配信システム、キャッシュサーバおよびコンテンツ配信方法に関し、特に、動画コンテンツをモバイルネットワークでキャッシュした上で、種々の端末(例えば、携帯電話、スマートフォン、PC(Personal Computer)、ゲーム機等)に配信するコンテンツ配信システム、キャッシュサーバおよびコンテンツ配信方法に関する。
モバイルネットワーク上に複数のキャッシュサーバを備え、
前記複数のキャッシュサーバは、それぞれ、
インターネット上でコンテンツを配信する配信サーバ装置が保有するコンテンツの少なくとも一部を一時的に蓄積するコンテンツ一時蓄積部と、
携帯端末からのコンテンツ要求メッセージに含まれる情報を用いて、該携帯端末から要求されたコンテンツを蓄積しているキャッシュサーバを前記複数のキャッシュサーバの中から判別する判別部と、
前記要求されたコンテンツのファイルを前記判別されたキャッシュサーバから読み出して前記コンテンツ一時蓄積部に出力するコンテンツ確保部と、
前記携帯端末からの所定の信号に基づいて前記モバイルネットワークの帯域を推定し、前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から読み出し、該ファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから一部のフレームを削除したストリームを生成し、生成したストリームをパケットに格納して前記携帯端末に送出する配信部と、を備える。
インターネット上でコンテンツを配信する配信サーバ装置が保有するコンテンツの少なくとも一部を一時的に蓄積するコンテンツ一時蓄積部と、
携帯端末からのコンテンツ要求メッセージに含まれる情報を用いて、該携帯端末から要求されたコンテンツを蓄積しているキャッシュサーバを、モバイルネットワーク上に設けられた複数のキャッシュサーバの中から判別する判別部と、
前記要求されたコンテンツのファイルを前記判別されたキャッシュサーバから読み出して前記コンテンツ一時蓄積部に出力するコンテンツ確保部と、
前記携帯端末からの所定の信号に基づいて前記モバイルネットワークの帯域を推定し、前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から読み出し、該ファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから一部のフレームを削除したストリームを生成し、生成したストリームをパケットに格納して前記携帯端末に送出する配信部と、を備える。
キャッシュサーバが、インターネット上でコンテンツを配信する配信サーバ装置が保有するコンテンツの少なくとも一部を、自身に設けられたコンテンツ一時蓄積部に一時的に蓄積する工程と、
携帯端末からのコンテンツ要求メッセージに含まれる情報を用いて、該携帯端末から要求されたコンテンツを蓄積しているキャッシュサーバを、モバイルネットワーク上に設けられた複数のキャッシュサーバの中から判別する工程と、
前記要求されたコンテンツのファイルを前記判別されたキャッシュサーバから読み出して前記コンテンツ一時蓄積部に出力する工程と、
前記携帯端末からの所定の信号に基づいて前記モバイルネットワークの帯域を推定する工程と、
前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から読み出す工程と、
読み出したファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから一部のフレームを削除したストリームを生成し、生成したストリームをパケットに格納して前記携帯端末に送出する工程と、を含む。
モバイルネットワーク上に複数のキャッシュサーバを備え、
前記複数のキャッシュサーバは、それぞれ、
インターネット上でコンテンツを配信する配信サーバ装置が保有するコンテンツの少なくとも一部を一時的に蓄積するコンテンツ一時蓄積部と、
携帯端末からのコンテンツ要求メッセージに含まれる情報を用いて、該携帯端末から要求されたコンテンツを蓄積しているキャッシュサーバを前記複数のキャッシュサーバの中から判別する判別部と、
前記要求されたコンテンツのファイルを前記判別されたキャッシュサーバから読み出して前記コンテンツ一時蓄積部に出力するコンテンツ確保部と、
前記携帯端末からの所定の信号に基づいて前記モバイルネットワークの帯域を推定し、前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から読み出し、該ファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから一部のフレームを削除したストリームを生成してファイルに格納し、該調整後のストリームを格納したファイルを含むパケットを、少なくとも一部の期間に対し前記携帯端末のバッファ容量に応じて送出するタイミングを制御しつつ前記携帯端末に送出する配信部と、を備える。
インターネット上でコンテンツを配信する配信サーバ装置が保有するコンテンツの少なくとも一部を一時的に蓄積するコンテンツ一時蓄積部と、
携帯端末からのコンテンツ要求メッセージに含まれる情報を用いて、該携帯端末から要求されたコンテンツを蓄積しているキャッシュサーバを、モバイルネットワーク上に設けられた複数のキャッシュサーバの中から判別する判別部と、
前記要求されたコンテンツのファイルを前記判別されたキャッシュサーバから読み出して前記コンテンツ一時蓄積部に出力するコンテンツ確保部と、
前記携帯端末からの所定の信号に基づいて前記モバイルネットワークの帯域を推定し、前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から読み出し、該ファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから一部のフレームを削除したストリームを生成してファイルに格納し、該調整後のストリームを格納したファイルを含むパケットを、少なくとも一部の期間に対し前記携帯端末のバッファ容量に応じて送出するタイミングを制御しつつ前記携帯端末に送出する配信部と、を備える。
キャッシュサーバが、インターネット上でコンテンツを配信する配信サーバ装置が保有するコンテンツの少なくとも一部を、自身に設けられたコンテンツ一時蓄積部に一時的に蓄積する工程と、
携帯端末からのコンテンツ要求メッセージに含まれる情報を用いて、該携帯端末から要求されたコンテンツを蓄積しているキャッシュサーバを、モバイルネットワーク上に設けられた複数のキャッシュサーバの中から判別する工程と、
前記要求されたコンテンツのファイルを前記判別されたキャッシュサーバから読み出して前記コンテンツ一時蓄積部に出力する工程と、
前記携帯端末からの所定の信号に基づいて前記モバイルネットワークの帯域を推定する工程と、
前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から読み出す工程と、
読み出したファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから一部のフレームを削除したストリームを生成してファイルに格納する工程と、
前記調整後のストリームを格納したファイルを含むパケットを、少なくとも一部の期間に対し前記携帯端末のバッファ容量に応じて送出するタイミングを制御しつつ前記携帯端末に送出する工程と、を含む。
[形態1]
上記第1の視点に係るコンテンツ配信システムのとおりである。
[形態2]
前記配信部は、前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から分割して読み出すとともに、該分割されたファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから優先度の低いフレームを削除したストリームを生成してもよい。
[形態3]
前記配信部は、前記携帯端末へ送信した送信パケットに対する応答パケットを前記携帯端末から受信した場合には、該送信パケットの送信時刻と該応答パケットの受信時刻との差、および、該送信パケットのサイズに応じて、前記モバイルネットワークの帯域を推定してもよい。
[形態4]
前記配信部は、前記モバイルネットワークが輻輳状態であることを示す信号を前記携帯端末から受信した場合には、所定の期間に亘って前記パケットを送出しないようにしてもよい。
[形態5]
前記複数のキャッシュサーバは、透過型または完全透過型のプロキシサーバであってもよい。
[形態6]
前記モバイルネットワークは、3GモバイルネットワークまたはLTE(Long Term Evolution)/EPC(Evolved Packet Core)ネットワークであってもよい。
[形態7]
上記第2の視点に係るキャッシュサーバのとおりである。
[形態8]
前記配信部は、前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から分割して読み出すとともに、該分割されたファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから優先度の低いフレームを削除したストリームを生成してもよい。
[形態9]
前記配信部は、前記携帯端末へ送信した送信パケットに対する応答パケットを前記携帯端末から受信した場合には、該送信パケットの送信時刻と該応答パケットの受信時刻との差、および、該送信パケットのサイズに応じて、前記モバイルネットワークの帯域を推定してもよい。
[形態10]
前記配信部は、前記モバイルネットワークが輻輳状態であることを示す信号を前記携帯端末から受信した場合には、所定の期間に亘って前記パケットを送出しないようにしてもよい。
[形態11]
上記第3の視点に係るコンテンツ配信方法のとおりである。
[形態12]
上記コンテンツ配信方法において、前記キャッシュサーバは、前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から分割して受信するとともに、該分割されたファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから優先度の低いフレームを削除したストリームを生成してもよい。
[形態13]
上記コンテンツ配信方法において、前記キャッシュサーバは、前記携帯端末へ送信した送信パケットに対する応答パケットを前記携帯端末から受信した場合には、該送信パケットの送信時刻と該応答パケットの受信時刻との差、および、該送信パケットのサイズに応じて、前記モバイルネットワークの帯域を推定してもよい。
[形態14]
上記コンテンツ配信方法において、前記キャッシュサーバは、前記モバイルネットワークが輻輳状態であることを示す信号を前記携帯端末から受信した場合には、所定の期間に亘って前記パケットを送出しないようにしてもよい。
[形態15]
インターネット上でコンテンツを配信する配信サーバ装置が保有するコンテンツの少なくとも一部を、自身に設けられたコンテンツ一時蓄積部に一時的に蓄積する処理と、
携帯端末からのコンテンツ要求メッセージに含まれる情報を用いて、該携帯端末から要求されたコンテンツを蓄積しているキャッシュサーバを、モバイルネットワーク上に設けられた複数のキャッシュサーバの中から判別する処理と、
前記要求されたコンテンツのファイルを前記判別されたキャッシュサーバから読み出して前記コンテンツ一時蓄積部に出力する処理と、
前記携帯端末からの所定の信号に基づいて前記モバイルネットワークの帯域を推定する処理と、
前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から読み出す処理と、
読み出したファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから一部のフレームを削除したストリームを生成し、生成したストリームをパケットに格納して前記携帯端末に送出する処理と、をキャッシュサーバに設けられたコンピュータに実行させる、プログラムが提供される。なお、プログラムは非トランジエントなコンピュータ読み取り可能な記録媒体に記録されたプログラム製品として提供し得る。
[形態16]
上記プログラムにおいて、前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から分割して受信するとともに、該分割されたファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから優先度の低いフレームを削除したストリームを生成する処理を、前記コンピュータに実行させるようにしてもよい。
[形態17]
上記プログラムにおいて、前記携帯端末へ送信した送信パケットに対する応答パケットを前記携帯端末から受信した場合には、該送信パケットの送信時刻と該応答パケットの受信時刻との差、および、該送信パケットのサイズに応じて、前記モバイルネットワークの帯域を推定する処理を、前記コンピュータに実行させるようにしてもよい。
[形態18]
上記プログラムにおいて、前記モバイルネットワークが輻輳状態であることを示す信号を前記携帯端末から受信した場合には、所定の期間に亘って前記パケットを送出しないようにする処理を前記コンピュータに実行させるようにしてもよい。
第1の実施形態に係るコンテンツ配信システムについて、図面を参照して説明する。図1は、本実施形態に係るコンテンツ配信システムの構成を一例として示す図である。図1を参照すると、コンテンツ配信システムは、インターネット145上に配信サーバ装置121を備え、モバイルネットワーク150上に、SGSN(Serving GPRS Support Node)/GGSN(Gateway GPRS Support Node)装置190_1~190_N、キャッシュサーバ110_1~110_N、RNC(Radio Network Controller)装置195_1~195_L、197_1~197_L、および、基地局装置180_1~180_M、181_1~181_M、182_1~182_M、183_1~183_Mを備えている。
第2の実施形態に係るコンテンツ配信システムについて、図面を参照して説明する。図4は、本実施形態に係るコンテンツ配信システムの構成を一例として示すブロック図である。
第3の実施形態に係るコンテンツ配信システムについて、図面を参照して説明する。図5は、本実施形態に係るコンテンツ配信システムの構成を一例として示すブロック図である。
第4の実施形態に係るコンテンツ配信システムについて、図面を参照して説明する。図6は、本実施形態に係るコンテンツ配信システムの構成を一例として示すブロック図である。
第5の実施形態に係るコンテンツ配信システムについて、図面を参照して説明する。図7は、本実施形態に係るコンテンツ配信システムの構成を一例として示す図である。図7を参照すると、コンテンツ配信システムは、インターネット145上に配信サーバ装置121を備え、モバイルネットワーク150上に、SGSN(Serving GPRS Support Node)/GGSN(Gateway GPRS Support Node)装置190_1~190_N、キャッシュサーバ110_1~110_N、RNC(Radio Network Controller)装置195_1~195_L、197_1~197_L、および、基地局装置180_1~180_M、181_1~181_M、182_1~182_M、183_1~183_Mを備えている。
第6の実施形態に係るコンテンツ配信システムについて、図面を参照して説明する。図10は、本実施形態に係るコンテンツ配信システムの構成を一例として示すブロック図である。
第7の実施形態に係るコンテンツ配信システムについて、図面を参照して説明する。図11は、本実施形態に係るコンテンツ配信システムの構成を一例として示すブロック図である。
第8の実施形態に係るコンテンツ配信システムについて、図面を参照して説明する。図12は、本実施形態に係るコンテンツ配信システムの構成を一例として示すブロック図である。
111 制御信号送受信部
112 コンテンツ確保部
113 コンテンツ一時蓄積部
114 配信部
115 解析部
116 収集部
117 判別部
118 コンテンツリスト作成部
120_1~120_N プロキシサーバ
121 配信サーバ装置
145 インターネット
150 モバイルネットワーク
170 携帯端末
180_1~180_M、181_1~181_M、182_1~182_M、183_1~183_M 基地局装置
190_1~190_N SGSN/GGSN装置
195_1~195_L、197_1~197_L RNC装置
200 送信部
201 受信部
202 帯域推定部
203 コンテンツ獲得部
204 選択調整部
205 送信タイミング制御部
250 モバイルLTE/EPCネットワーク
260_1~260_M、261_1~261_M、262_1~262_M eNodeB装置
290_1~290_N S/P-GW装置
Claims (32)
- モバイルネットワーク上に複数のキャッシュサーバを備え、
前記複数のキャッシュサーバは、それぞれ、
インターネット上でコンテンツを配信する配信サーバ装置が保有するコンテンツの少なくとも一部を一時的に蓄積するコンテンツ一時蓄積部と、
携帯端末からのコンテンツ要求メッセージに含まれる情報を用いて、該携帯端末から要求されたコンテンツを蓄積しているキャッシュサーバを前記複数のキャッシュサーバの中から判別する判別部と、
前記要求されたコンテンツのファイルを前記判別されたキャッシュサーバから読み出して前記コンテンツ一時蓄積部に出力するコンテンツ確保部と、
前記携帯端末からの所定の信号に基づいて前記モバイルネットワークの帯域を推定し、前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から読み出し、該ファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから一部のフレームを削除したストリームを生成し、生成したストリームをパケットに格納して前記携帯端末に送出する配信部と、を備える、コンテンツ配信システム。 - 前記配信部は、前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から分割して読み出すとともに、該分割されたファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから優先度の低いフレームを削除したストリームを生成する、請求項1に記載のコンテンツ配信システム。
- 前記配信部は、前記携帯端末へ送信した送信パケットに対する応答パケットを前記携帯端末から受信した場合には、該送信パケットの送信時刻と該応答パケットの受信時刻との差、および、該送信パケットのサイズに応じて、前記モバイルネットワークの帯域を推定する、請求項1または2に記載のコンテンツ配信システム。
- 前記配信部は、前記モバイルネットワークが輻輳状態であることを示す信号を前記携帯端末から受信した場合には、所定の期間に亘って前記パケットを送出しない、請求項1または2に記載のコンテンツ配信システム。
- 前記配信部は、前記携帯端末からの所定の信号に基づいて前記モバイルネットワークの帯域を推定し、前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から読み出し、該ファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから一部のフレームを削除したストリームを生成してファイルに格納し、該調整後のストリームを格納したファイルを含むパケットを、少なくとも一部の期間に対し前記携帯端末のバッファ容量に応じて送出するタイミングを制御しつつ前記携帯端末に送出する、請求項1に記載のコンテンツ配信システム。
- 前記配信部は、前記調整後のストリームを格納したファイルのビットレートが前記帯域よりも低い場合には、該ビットレートおよび前記バッファ容量に基づいて、前記携帯端末におけるバッファ量が前記バッファ容量に達するまでの期間を算出し、算出した期間に応じて決まる該バッファ量がゼロとなるまでの期間に亘って前記パケットを送出しない、請求項5に記載のコンテンツ配信システム。
- 前記配信部は、前記調整後のストリームを格納したファイルのビットレートが前記帯域と等しい場合には、前記携帯端末がコンテンツを再生するビットレートおよび前記バッファ容量に基づいて、前記携帯端末におけるバッファ量がゼロとなるまでの期間を算出し、該期間に亘って前記パケットを送出しない、請求項5に記載のコンテンツ配信システム。
- 前記配信部は、前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から分割して読み出すとともに、該分割されたファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから優先度の低いフレームを削除したストリームを生成する、請求項5ないし7のいずれか1項に記載のコンテンツ配信システム。
- 前記配信部は、前記携帯端末へ送信した送信パケットに対する応答パケットを前記携帯端末から受信した場合には、該送信パケットの送信時刻と該応答パケットの受信時刻との差、および、該送信パケットのサイズに応じて、前記モバイルネットワークの帯域を推定する、請求項5ないし8のいずれか1項に記載のコンテンツ配信システム。
- 前記配信部は、前記モバイルネットワークが輻輳状態であることを示す信号を前記携帯端末から受信した場合には、所定の期間に亘って前記パケットを送出しない、請求項5ないし8のいずれか1項に記載のコンテンツ配信システム。
- 前記複数のキャッシュサーバは、透過型または完全透過型のプロキシサーバである、請求項1ないし10のいずれか1項に記載のコンテンツ配信システム。
- 前記モバイルネットワークは、3G(3rd Generation)モバイルネットワークまたはLTE(Long Term Evolution)/EPC(Evolved Packet Core)ネットワークである、請求項1ないし11のいずれか1項に記載のコンテンツ配信システム。
- インターネット上でコンテンツを配信する配信サーバ装置が保有するコンテンツの少なくとも一部を一時的に蓄積するコンテンツ一時蓄積部と、
携帯端末からのコンテンツ要求メッセージに含まれる情報を用いて、該携帯端末から要求されたコンテンツを蓄積しているキャッシュサーバを、モバイルネットワーク上に設けられた複数のキャッシュサーバの中から判別する判別部と、
前記要求されたコンテンツのファイルを前記判別されたキャッシュサーバから読み出して前記コンテンツ一時蓄積部に出力するコンテンツ確保部と、
前記携帯端末からの所定の信号に基づいて前記モバイルネットワークの帯域を推定し、前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から読み出し、該ファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから一部のフレームを削除したストリームを生成し、生成したストリームをパケットに格納して前記携帯端末に送出する配信部と、を備える、キャッシュサーバ。 - 前記配信部は、前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から分割して読み出すとともに、該分割されたファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから優先度の低いフレームを削除したストリームを生成する、請求項13に記載のキャッシュサーバ。
- 前記配信部は、前記携帯端末へ送信した送信パケットに対する応答パケットを前記携帯端末から受信した場合には、該送信パケットの送信時刻と該応答パケットの受信時刻との差、および、該送信パケットのサイズに応じて、前記モバイルネットワークの帯域を推定する、請求項13または14に記載のキャッシュサーバ。
- 前記配信部は、前記モバイルネットワークが輻輳状態であることを示す信号を前記携帯端末から受信した場合には、所定の期間に亘って前記パケットを送出しない、請求項13または14に記載のキャッシュサーバ。
- 前記配信部は、前記携帯端末からの所定の信号に基づいて前記モバイルネットワークの帯域を推定し、前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から読み出し、該ファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから一部のフレームを削除したストリームを生成してファイルに格納し、該調整後のストリームを格納したファイルを含むパケットを、少なくとも一部の期間に対し前記携帯端末のバッファ容量に応じて送出するタイミングを制御しつつ前記携帯端末に送出する、請求項13に記載のキャッシュサーバ。
- 前記配信部は、前記調整後のストリームを格納したファイルのビットレートが前記帯域よりも低い場合には、該ビットレートおよび前記バッファ容量に基づいて、前記携帯端末におけるバッファ量が前記バッファ容量に達するまでの期間を算出し、算出した期間に応じて決まる該バッファ量がゼロとなるまでの期間に亘って前記パケットを送出しない、請求項17に記載のキャッシュサーバ。
- 前記配信部は、前記調整後のストリームを格納したファイルのビットレートが前記帯域と等しい場合には、前記携帯端末がコンテンツを再生するビットレートおよび前記バッファ容量に基づいて、前記携帯端末におけるバッファ量がゼロとなるまでの期間を算出し、該期間に亘って前記パケットを送出しない、請求項17に記載のキャッシュサーバ。
- 前記配信部は、前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から分割して読み出すとともに、該分割されたファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから優先度の低いフレームを削除したストリームを生成する、請求項17ないし19のいずれか1項に記載のキャッシュサーバ。
- 前記配信部は、前記携帯端末へ送信した送信パケットに対する応答パケットを前記携帯端末から受信した場合には、該送信パケットの送信時刻と該応答パケットの受信時刻との差、および、該送信パケットのサイズに応じて、前記モバイルネットワークの帯域を推定する、請求項17ないし20のいずれか1項に記載のキャッシュサーバ。
- 前記配信部は、前記モバイルネットワークが輻輳状態であることを示す信号を前記携帯端末から受信した場合には、所定の期間に亘って前記パケットを送出しない、請求項17ないし20のいずれか1項に記載のキャッシュサーバ。
- キャッシュサーバが、インターネット上でコンテンツを配信する配信サーバ装置が保有するコンテンツの少なくとも一部を、自身に設けられたコンテンツ一時蓄積部に一時的に蓄積する工程と、
携帯端末からのコンテンツ要求メッセージに含まれる情報を用いて、該携帯端末から要求されたコンテンツを蓄積しているキャッシュサーバを、モバイルネットワーク上に設けられた複数のキャッシュサーバの中から判別する工程と、
前記要求されたコンテンツのファイルを前記判別されたキャッシュサーバから読み出して前記コンテンツ一時蓄積部に出力する工程と、
前記携帯端末からの所定の信号に基づいて前記モバイルネットワークの帯域を推定する工程と、
前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から読み出す工程と、
読み出したファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから一部のフレームを削除したストリームを生成し、生成したストリームをパケットに格納して前記携帯端末に送出する工程と、を含む、コンテンツ配信方法。 - 前記キャッシュサーバは、前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から分割して受信するとともに、該分割されたファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから優先度の低いフレームを削除したストリームを生成する、請求項23に記載のコンテンツ配信方法。
- 前記キャッシュサーバは、前記携帯端末へ送信した送信パケットに対する応答パケットを前記携帯端末から受信した場合には、該送信パケットの送信時刻と該応答パケットの受信時刻との差、および、該送信パケットのサイズに応じて、前記モバイルネットワークの帯域を推定する、請求項23または24に記載のコンテンツ配信方法。
- 前記キャッシュサーバは、前記モバイルネットワークが輻輳状態であることを示す信号を前記携帯端末から受信した場合には、所定の期間に亘って前記パケットを送出しない、請求項23または24に記載のコンテンツ配信方法。
- 前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から読み出す工程と、
読み出したファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから一部のフレームを削除したストリームを生成してファイルに格納する工程と、
前記調整後のストリームを格納したファイルを含むパケットを、少なくとも一部の期間に対し前記携帯端末のバッファ容量に応じて送出するタイミングを制御しつつ前記携帯端末に送出する工程と、を含む、請求項23に記載のコンテンツ配信方法。 - 前記キャッシュサーバは、前記調整後のストリームを格納したファイルのビットレートが前記帯域よりも低い場合には、該ビットレートおよび前記バッファ容量に基づいて、前記携帯端末におけるバッファ量が前記バッファ容量に達するまでの期間を算出し、算出した期間に応じて決まる該バッファ量がゼロとなるまでの期間に亘って前記パケットを送出しない、請求項27に記載のコンテンツ配信方法。
- 前記キャッシュサーバは、前記調整後のストリームを格納したファイルのビットレートが前記帯域と等しい場合には、前記携帯端末がコンテンツを再生するビットレートおよび前記バッファ容量に基づいて、前記携帯端末におけるバッファ量がゼロとなるまでの期間を算出し、該期間に亘って前記パケットを送出しない、請求項27に記載のコンテンツ配信方法。
- 前記キャッシュサーバは、前記要求されたコンテンツのファイルを前記コンテンツ一時蓄積部から分割して読み出すとともに、該分割されたファイルから抽出したストリームのビットレートが前記帯域を超えないように、該ストリームから優先度の低いフレームを削除したストリームを生成する、請求項27ないし29のいずれか1項に記載のコンテンツ配信方法。
- 前記キャッシュサーバは、前記携帯端末へ送信した送信パケットに対する応答パケットを前記携帯端末から受信した場合には、該送信パケットの送信時刻と該応答パケットの受信時刻との差、および、該送信パケットのサイズに応じて、前記モバイルネットワークの帯域を推定する、請求項27ないし30のいずれか1項に記載のコンテンツ配信方法。
- 前記キャッシュサーバは、前記モバイルネットワークが輻輳状態であることを示す信号を前記携帯端末から受信した場合には、所定の期間に亘って前記パケットを送出しない、請求項27ないし30のいずれか1項に記載のコンテンツ配信方法。
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- 2012-09-21 EP EP12834074.2A patent/EP2752772A4/en not_active Withdrawn
- 2012-09-21 CN CN201280046221.1A patent/CN103843358A/zh active Pending
- 2012-09-21 KR KR1020147010485A patent/KR20140079419A/ko not_active Application Discontinuation
- 2012-09-21 WO PCT/JP2012/074150 patent/WO2013042758A1/ja active Application Filing
- 2012-09-21 US US14/345,435 patent/US20140344392A1/en not_active Abandoned
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Also Published As
Publication number | Publication date |
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KR20140079419A (ko) | 2014-06-26 |
EP2752772A4 (en) | 2015-03-25 |
CN103843358A (zh) | 2014-06-04 |
JP5874730B2 (ja) | 2016-03-02 |
US20140344392A1 (en) | 2014-11-20 |
JPWO2013042758A1 (ja) | 2015-03-26 |
EP2752772A1 (en) | 2014-07-09 |
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