WO2013005758A1 - コンテンツ配信システムおよびコンテンツ配信方法 - Google Patents
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- WO2013005758A1 WO2013005758A1 PCT/JP2012/067049 JP2012067049W WO2013005758A1 WO 2013005758 A1 WO2013005758 A1 WO 2013005758A1 JP 2012067049 W JP2012067049 W JP 2012067049W WO 2013005758 A1 WO2013005758 A1 WO 2013005758A1
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Definitions
- the present invention is based on the priority claim of Japanese patent application: Japanese Patent Application No. 2011-149192 (filed on July 5, 2011), the entire contents of which are incorporated herein by reference. Shall.
- the present invention relates to a content distribution system and a content distribution method, and in particular, contents including moving images, still images, audio, software, applications, etc. are cached in a mobile network, and various terminals (for example, mobile phones, smartphones, PCs) (Personal Computer), a game machine, and the like.
- LTE Long Term Evolution
- EPC Evolved Packet Core
- Patent Document 1 describes an information transmission system that acquires information indicating the screen resolution of a terminal, converts image data so as to conform to the acquired screen resolution, and transmits the information to the terminal.
- Patent Document 2 describes a content distribution system that dynamically converts the size of an image so as to satisfy the data transmission rate requirement of a requesting client.
- JP 2010-097291 A JP-T-2004-518218
- various terminals are used as terminals when distributing managed content including images, moving images, audio, software, applications, etc. over a mobile network.
- a conventional mobile phone, smart phone, tablet terminal, PC, or the like is used.
- content requests from all terminals are transmitted to the storage device that stores the managed content via the packet transfer device, and the storage device sends all the terminals to the terminal via the packet transfer device. , Delivering content.
- the objective of this invention is providing the content delivery system which solves this subject.
- the content distribution system is: Connected to at least one of a plurality of packet transfer devices for transferring packets transmitted and received between a storage device for storing managed content and a user terminal, and temporarily stores at least a part of the managed content Multiple cache servers to A control device for controlling at least one of the plurality of cache servers on a mobile network, The control device determines a screen resolution of the terminal based on information included in a content request message from the terminal, and selects a cache server that stores content with the screen resolution from the plurality of cache servers.
- Each of the plurality of cache servers based on a signal received from the terminal, a bit rate calculation unit that calculates a bit rate for sending content, A transmission unit that reads out a file or stream of the content requested from the terminal, having the screen resolution, and having the screen resolution or less, stored in a packet of a predetermined protocol, and output.
- the content distribution method is: A plurality of cache servers connected to at least one of the plurality of packet transfer devices, which transfer packets transmitted and received between the storage device that stores the management content and the user terminal, each of at least the management content A process of temporarily storing a part, A step of determining a screen resolution of the terminal based on information included in a content request message from the terminal;
- the control device selecting a cache server that stores the content of the screen resolution from the plurality of cache servers, and instructing the selected cache server to deliver the content;
- the cache server that has received the instruction reads out a file or stream of the content requested from the terminal having the screen resolution and the bit rate or less, storing it in a packet of a predetermined protocol, and transmitting it And a step of performing.
- content can be distributed without lowering the user's QoE.
- the content distribution system of the present invention is a storage device (120) for storing managed content, and between the storage device (120) and a user terminal (for example, portable terminal 170).
- a plurality of packet transfer devices for example, SGSN / GGSN devices 190_1 to 190_N) that transfer packets transmitted and received in the network, a plurality of cache servers (110_1 to 110_N) that temporarily store at least a part of the managed content,
- a control device (160) for controlling at least one of the cache servers (110_1 to 110_N) and a mobile network (150), and each of the plurality of cache servers (110_1 to 110_N) transfers a plurality of packets.
- the control device (160) is connected to either of them, and the control device (160) determines the screen resolution of the terminal (170) based on the information included in the content request message from the terminal (170), and stores the content of the screen resolution.
- a server is selected from a plurality of cache servers (110_1 to 110_N), and an instruction is given to distribute the content to the selected cache server.
- Each of the plurality of cache servers (110_1 to 110_N) receives from the terminal (170).
- the bit rate calculation unit (202) may calculate the bit rate based on a TCP (Transmission Control Protocol) response signal or an ECN (Explicit Congestion Notification) signal received from the terminal (170). Further, the bit rate calculation unit (202) determines the packet response time as a difference between the time when the predetermined packet is transmitted from the transmission unit (200) and the time when the TCP response signal for the predetermined packet is received from the terminal (170). And the bit rate may be calculated based on the response time. Further, the bit rate calculation unit (202) may reduce the bit rate by a predetermined amount or zero when the ECN signal is received from the terminal (170).
- TCP Transmission Control Protocol
- ECN Exlicit Congestion Notification
- the control device (160) extracts a plurality of cache servers that store the content of the screen resolution from the plurality of cache servers (110_1 to 110_N), and the presence of the terminal (170) from the extracted plurality of cache servers.
- a cache server may be selected according to the area information.
- a plurality of packet transfer devices are respectively an SGSN (Serving General packet radio service Support Node) device, GGSN (Gateway General packet radio service Support Node) device or SGSN in the mobile packet network (150). / GGSN device, S-GW (Serving Gateway) device, P-GW (Packet data network Gateway) device or S / P-GW device in the mobile LTE / EPC network (250).
- SGSN Serving General packet radio service Support Node
- GGSN Global System for Mobile communications
- S-GW Serving Gateway
- P-GW Packet data network Gateway
- the content distribution system A storage device for storing managed content; A plurality of packet transfer devices for transferring packets transmitted and received between the storage device and a user terminal; A plurality of cache servers for temporarily storing at least a part of the management content; A control device for controlling at least one of the plurality of cache servers on a mobile network, Each of the plurality of cache servers is connected to at least one of the plurality of packet transfer devices; The control device determines a screen resolution of the terminal based on information included in a content request message from the terminal, and selects a cache server that stores content with the screen resolution from the plurality of cache servers.
- the bit rate calculation unit may calculate the bit rate based on a TCP response signal or ECN (Explicit Congestion Notification) signal received from the terminal.
- the bit rate calculation unit measures the response time of the packet as a difference between the time when the predetermined packet is transmitted from the transmission unit and the time when the TCP response signal for the predetermined packet is received from the terminal, and the response time is The bit rate may be calculated based on this.
- the bit rate calculation unit may reduce the bit rate by a predetermined amount or zero when an ECN signal is received from the terminal.
- the control device extracts a plurality of cache servers that store the screen resolution content from the plurality of cache servers, and selects a cache server according to the location information of the terminal from the extracted cache servers. You may make it select.
- the plurality of packet transfer devices are SGSN devices, GGSN devices or SGSN / GGSN devices in mobile packet networks, or S-GW devices, P-GW devices or S / P-GW devices in mobile LTE / EPC networks, respectively. There may be.
- the management content may include at least one of moving images, still images, audio, audio, software, applications, and data.
- the content distribution method is A process in which the storage device stores the management content; A plurality of cache servers respectively connected to at least one of a plurality of packet transfer devices that transfer packets transmitted and received between the storage device and the user terminal each temporarily store at least a part of the management content.
- the control device selecting a cache server that stores the content of the screen resolution from the plurality of cache servers, and instructing the selected cache server to deliver the content;
- the cache server that has received the instruction reads out a file or stream of the content requested from the terminal having the screen resolution and the bit rate or less, storing it in a packet of a predetermined protocol, and transmitting it And a step of performing.
- the cache server that has received the instruction may calculate the bit rate based on a TCP response signal or an ECN (Explicit Congestion Notification) signal received from the terminal.
- the cache server that has received the instruction sends a packet response time as a difference between a time at which the predetermined packet is transmitted from the transmission unit and a time at which the TCP response signal for the predetermined packet is received from the terminal. And the bit rate may be calculated based on the response time.
- the cache server that receives the instruction may reduce the bit rate by a predetermined amount or zero when the ECN signal is received from the terminal.
- the control device extracts a plurality of cache servers that store the screen resolution content from the plurality of cache servers, and the location information of the terminal from the plurality of extracted cache servers.
- the cache server may be selected according to the situation.
- a configuration in the case where the content is a moving image is shown as an example.
- the same configuration may be used in the case where the content is a still image, audio, audio, software, application, data, or the like. it can.
- FIG. 1 is a block diagram illustrating an example of a configuration of a content distribution system according to the present embodiment.
- FIG. 1 shows a configuration when a 3G (3rd generation) mobile packet network is used as a mobile network and an SGSN / GGSN apparatus is used as a packet transfer apparatus.
- the storage device 120 stores content held by the mobile operator or content that the mobile operator has signed with a content provider.
- these contents are called management contents.
- the management content is a file that stores a compression-encoded bitstream or a compression-encoded bitstream of content including at least one of moving images, still images, audio, audio, and the like.
- the management content may be software, application, data, or the like.
- a portable terminal is used as the terminal.
- a terminal other than the mobile terminal can be used as the terminal.
- N (N ⁇ 2) SGSN / GGSN apparatuses 190_1 to 190_N are arranged.
- the SGSN / GGSN device 190_1 is connected to RNC (Radio Network Controller) devices 195_1 to 195_L (L ⁇ 2).
- 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, but are not shown in FIG. 1 for the sake of space.
- M (M ⁇ 2) base stations are connected per RNC device. For example, M base stations 180_1 to 180_M are connected to the RNC device 195_1.
- one cache server is connected to the GGSN function unit of each SGSN / GGSN device.
- the cache server 110_1 is connected to the SGSN / GGSN apparatus 190_1.
- the SGSN / GGSN device means a device configuration in which the SGSN function unit and the GGSN function unit are installed in the same place.
- the N cache servers 110_1 to 110_N are connected to the control device 160. Note that some of the N cache servers 110_1 to 110_N may be connected to the control device 160.
- the portable terminal 170 describes the URL (Uniform Resource Locator) of the requested content and issues a distribution connection request message. Then, the base station where the mobile terminal 170 is located (in the case of FIG. 1, any one of the base stations 181_1 to 181_M) receives the connection request message, and the RNC device managing the base station (FIG. 1). In this case, a connection request message is sent to the RNC device 195_L).
- URL Uniform Resource Locator
- the RNC device 195_L When the RNC device 195_L receives the connection request message from the base station, the connection request message, the IP (Internet protocol) address of the storage device 120, the IP address of the portable terminal 170, etc. are displayed in the payload of the GTP (General packet packet radio service tunneling protocol) packet.
- the GTP packet is transferred to the SGSN / GGSN apparatus 190_1 that is stored in the part and collects the RNC apparatuses 195_1 to 195_L.
- the SGSN / GGSN apparatus 190_1 receives the GTP packet.
- the cache server 110_1 is connected to 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 unit of the SGSN / GGSN apparatus 190_N.
- Cache servers 110_1 to 110_N and a policy device 165 are connected to the control device 160.
- the control device 160 determines the screen resolution of the mobile terminal 170 from the connection request information from the mobile terminal 170, selects a cache server that has the requested content and has the content of the screen resolution, and selects the selected cache server Give instructions.
- each cache server When each cache server receives an instruction from the control device 160, each cache server reads out the requested content with the designated screen resolution and distributes it to the portable terminal 170. In addition, each cache server detects temporal fluctuations in the bandwidth of the wireless section of the mobile network, and performs distribution so as to follow the fluctuations.
- FIG. 2 is a block diagram illustrating the configuration of the control device 160 as an example. The configuration of the control device 160 will be described with reference to FIG. Referring to FIG. 2, the control device 160 includes a control signal transmission / reception unit 161, a resolution determination unit 186, a cache server selection unit 187, and a content map creation / storage unit 167.
- the control signal transmission / reception unit 161 extracts the terminal information included in the user agent part of the connection request information from the mobile terminal 170 and outputs it to the resolution determination unit 186. Further, the control signal transmission / reception unit 161 outputs the requested content information to the cache server selection unit 187. Further, the control signal transmission / reception unit 161 outputs the location information of the mobile terminal 170 to the cache server selection unit 187.
- the resolution determination unit 186 receives the terminal information as input, obtains the relationship between the terminal information and the screen resolution from the user data 164 in which user data is registered in advance, determines the screen resolution information corresponding to the mobile terminal, and determines the screen resolution information.
- the data is output to the cache server selection unit 187.
- the cache server selection unit 187 inputs the location information of the mobile terminal 170 and the requested content information (for example, the URL of the content) from the control signal transmission / reception unit 161, inputs the screen resolution information of the mobile terminal from the resolution determination unit 186, A content map is input from the content map creation / storage unit 167.
- the content map is a map indicating which content is cached by each cache server.
- the cache server selection unit 187 selects a cache server group that caches the content requested by the mobile terminal 170 and having the resolution input from the resolution determination unit 186, and considers the location information and the like. Select. Next, the cache server selection unit 187 instructs the selected cache server via the control signal transmission / reception unit 161 to distribute the content requested by the terminal.
- the content map creation / storage unit 167 receives the content list from each of the cache servers 110_1 to 110_N via the control signal transmission / reception unit 161 at predetermined time intervals, and temporarily stores which content in which cache server. A content map representing whether the content has been created is created, and the created content map is stored.
- FIG. 3 is a block diagram illustrating an example of the configuration of the cache server 110_1.
- the configuration of the cache server 110_1 connected to the SGSN / GGSN apparatus 190_1 will be described with reference to FIG. Since the other cache servers 110_2 to 110_N have the same configuration as the cache server 110_1, only the configuration of the cache server 110_1 will be described.
- the cache server 110_1 includes a control signal transmission / reception unit 111, an analysis unit 115, a content securing unit 112, a content temporary storage unit 113, a content list creation unit 116, and a distribution unit 114.
- the control signal transmission / reception unit 111 receives the connection request message from the mobile terminal 170 and the mobile terminal 170 from the SGSN / GGSN device 190_1.
- a GTP packet storing the IP address, the URL of the requested content, etc. is received.
- the control signal transmission / reception unit 111 receives the location information of the mobile terminal 170 from the SGSN / GGSN device 190_1.
- the analysis unit 115 reads the content of the connection request message stored in the payload part for the GTP packet, extracts information such as the received IP address of the mobile terminal 170, the URL of the requested content, and the control signal transmission / reception unit 111. These pieces of information are sent to the control device 160 via. In addition, the analysis unit 115 sends the location information of the mobile terminal 170 to the control device 160. Further, the analysis unit 115 outputs the requested content URL or the like to the distribution unit 114.
- the content securing unit 112 reads content from the storage device 120 in advance and outputs it to the content temporary storage unit 113.
- the content temporary storage unit 113 stores content.
- the content list creation unit 116 applies to all the content stored in the content temporary storage unit 113 by the cache server at predetermined time intervals or when a predetermined condition is satisfied. Then, a content list is created, and the content list of the cache server is sent to the control device 160 via the control signal transmission / reception unit 111.
- the distribution unit 114 inputs the URL information of the requested content from the analysis unit 115, inputs the screen resolution of the portable terminal 170 from the cache server selection unit 187 in FIG. 2, and is the requested content having the screen resolution.
- the content temporary storage unit 113 is searched for the content, and the corresponding content is read out.
- the distribution unit 114 generates a packet of a predetermined protocol (for example, TCP) for the read content, and sends the packet to the SGSN / GGSN device 190_1.
- the SGSN / GGSN apparatus 190_1 distributes a packet including content to the mobile terminal 170.
- FIG. 4 is a block diagram illustrating the configuration of the distribution unit 114 as an example. The configuration and operation of the distribution unit 114 will be described with reference to FIG. Referring to FIG. 4, the distribution unit 114 includes a transmission unit 200, a reception unit 201, a bit rate calculation unit 202, and an acquisition unit 203. The distribution unit 114 calculates the bit rate during content distribution, and distributes the content while switching to a file or stream having an appropriate bit rate.
- the receiving unit 201 receives a response signal packet (for example, an Ack signal) from the portable terminal 170 via the SGSN / GGSN device 190_1, and outputs information of the response signal packet to the bit rate calculation unit 202.
- a response signal packet for example, an Ack signal
- ECN Exlicit Congestion Notification
- the bit rate calculation unit 202 receives the transmission packet information and the response packet information as input, and associates the transmission packet with the response packet using the packet number, thereby measuring the response time T according to the following equation.
- Tack represents the time at which the Nth response signal packet was received by the reception unit 201
- Tsend represents the time at which the Nth transmission packet was transmitted by the transmission unit 200.
- the bit rate calculation unit 202 sets a target time Ta in advance, calculates a differential delay time between Ta and T, and calculates a transmission bit rate B from Equation (2) based on this.
- Bc is the transmission bit rate of the transmission packet input from the transmission unit 200 by the bit rate calculation unit 202.
- ⁇ is a coefficient for determining the convergence time, and is set to an appropriate value in advance.
- ⁇ is a predetermined conversion coefficient for converting a temporal change into a bit rate. Note that the bit rate calculation unit 202 may perform the calculation of Expression (2) at predetermined time intervals, for example, when there is a request from the acquisition unit 203.
- the bit rate calculation unit 202 outputs the bit rate B calculated by Expression (2) to the acquisition unit 203 at predetermined time intervals. Note that the bit rate calculation unit 202 may output the bit rate B in response to a request from the acquisition unit 203.
- the bit rate calculation unit 202 determines that the mobile network is in a congestion state and reduces the bit rate B by a predetermined amount
- the acquisition unit 203 inputs the URL of the content requested from the analysis unit 115 of FIG. 3, inputs the screen resolution from the control signal transmission / reception unit 111 of FIG. 3, inputs the bit rate B from the bit rate calculation unit 202,
- the content temporary storage unit 113 of FIG. 3 is searched for the requested content that has the indicated screen resolution and has a bit rate closest to B within a range not exceeding the bit rate B, and the corresponding file. Alternatively, a stream is acquired and output to the transmission unit 200.
- the transmission unit 200 inputs a content file or stream requested from the mobile terminal 170 and having a screen resolution instructed by the control device 160 from the acquisition unit 203.
- the transmission unit 200 stores the input file or stream, for example, in a TCP packet, and sends it to the SGSN / GGSN device 190_1.
- the transmission unit 200 notifies the bit rate calculation unit 202 of information (for example, packet number, transmission time, transmission bit rate, size, etc.) of the transmitted packet.
- control device 160 inputs the topology of the mobile network and the cost of the network routing path from the policy device 165. However, when these pieces of information do not change during operation or are predetermined fixed information, these pieces of information may be built in the control device 160 as a table.
- the cache servers may be connected to each other so that the contents can be interchanged between the cache servers.
- the cache server 110_1 may make an inquiry to the control device 160.
- the control device 160 determines whether the neighboring cache server, for example, the cache server 110_2 or the cache server 110_N holds the content, and reads the content from the cache server that holds the content. 110_1 may be instructed.
- FIG. 1 illustrates the case where one cache server is connected to one SGSN / GGSN apparatus.
- one cache server may be connected to a plurality of SGSN / GGSN apparatuses, or a plurality of cache servers may be connected to one SGSN / GGSN apparatus.
- the storage device 120 and the cache server devices 110_1 to 110_N may be connected.
- the SGSN / GGSN device in which the SGSN device and the GGSN device are integrated is used.
- separated the SGSN apparatus and the GGSN apparatus can also be used.
- a configuration in which at least one cache server is connected to either the SGSN device or the GGSN device can be employed.
- the mobile terminal 170 may be a mobile phone, a smartphone, or a PC equipped with a data communication card, and may be any terminal that can communicate with the mobile 3G network.
- bit rate calculation unit 202 may calculate the bit rate using an expression other than the expressions (1) and (2).
- control device 160 is a device that is physically separate from the cache server.
- control device 160 if it is logically separate from the cache server, it can be mounted on the same physical device as the cache server.
- FIG. 5 is a block diagram showing an example of the configuration of the content distribution system according to the present embodiment.
- FIG. 5 shows a configuration in which an LTE (Long Terminology Evolution) / EPC (Evolved Packets Core) network, which is a 3.9 generation mobile network, is used as the mobile network 250 instead of the 3G mobile network.
- LTE Long Terminology Evolution
- EPC Evolved Packets Core
- the functions of the base station and the RNC device are degraded, and only the eNodeB device is provided.
- an S / P-GW (Serving / Packet data network gateway) device is connected to an eNodeB device.
- 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 devices are connected to one S / P-GW device.
- 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 device.
- the cache server 110_1 is connected to the S / P-GW apparatus 290_1.
- the mobile terminal 170 describes the IP address of the storage device 120 and issues a distribution connection request message. Then, the eNodeB device in which the mobile terminal 170 is located (in the case of FIG. 5, one of the eNodeB devices 261_1 to 261_M) receives the connection request message. Any of the eNodeB devices 261_1 to 261M stores the connection request message, the IP address of the storage device 120, the IP address of the mobile terminal 170, etc. in the payload portion of the GTP protocol, and transfers the GTP packet to the S / P-GW device 290_2. To do.
- the cache server 110_1 has the same configuration as that shown in FIG. However, in the present 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 the connection request message from the portable terminal 170, the GTP packet storing the IP address, and the location information of the portable terminal 170 from the S / P-GW apparatus 290_1.
- the other cache servers 110_2 to 110_N also perform the above-described exchange with the S / P-GW apparatuses connected thereto.
- the control device 160 inputs the topology of the mobile network and the cost of the network routing path from the policy device 165. However, when these pieces of information do not change during operation or are predetermined fixed information, these pieces of information may be built in the control device 160 as a table.
- the cache servers may be connected to each other so that the contents can be interchanged between the cache servers.
- the cache server 110_1 may make an inquiry to the control device 160.
- the control device 160 may instruct the cache server 110_1 to read content from a neighboring cache server, for example, the cache server 110_2 or the cache server 110_N.
- FIG. 5 illustrates the case where one cache server is connected to one S / P-GW device.
- one cache server may be connected to a plurality of S / P-GW apparatuses, or a plurality of cache servers may be connected to one S / P-GW apparatus.
- the storage device 120 and the cache server devices 110_1 to 110_N may be connected.
- the S / P-GW apparatus in which the S-GW apparatus and the P-GW apparatus are integrated is used.
- a configuration in which the S-GW apparatus and the P-GW apparatus are separated can also be used.
- a configuration in which at least one cache server is connected to either the S-GW device or the P-GW device can be employed.
- the mobile terminal 170 may be a mobile phone, a smartphone, a PC equipped with a data communication card, or any other terminal that can communicate with the mobile 3.9G network.
- a terminal can also be used.
- bit rate calculation unit 202 may calculate the bit rate using an expression other than the expressions (1) and (2).
- control device 160 is a device that is physically separate from the cache server.
- control device 160 if it is logically separate from the cache server, it can be mounted on the same physical device as the cache server.
- the content distribution system of the present invention provides the following effects.
- the control device determines the screen resolution unique to the terminal based on the connection request signal from the terminal, selects the cache server that holds the content with the screen resolution, and issues an instruction to the cache server. As a result, it is possible to distribute content having a screen resolution suitable for the performance and profile of the terminal without modifying the terminal.
- the distribution unit of the cache server calculates the bit rate based on the response or notification from the terminal, and switches and outputs a file or stream having an appropriate bit rate according to the calculation result.
- congestion of the mobile network can be avoided.
- this effect becomes remarkable when the number of terminals increases and the content increases in capacity. Further, from the viewpoint of the user, there is no delay or packet loss, and there is an effect that the image does not freeze on the terminal side or the sound is interrupted.
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Abstract
Description
本発明は、日本国特許出願:特願2011-149192号(2011年7月5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およびコンテンツ配信方法に関し、特に、動画、静止画、オーディオ、ソフトウェア、アプリケーション等を含む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およびコンテンツ配信方法に関する。
管理コンテンツを蓄積する蓄積装置とユーザの端末との間で送受信されるパケットを転送する、複数のパケット転送装置のうちの少なくともいずれかに接続され、前記管理コンテンツの少なくとも一部を一時的に蓄積する複数のキャッシュサーバと、
前記複数のキャッシュサーバのうちの少なくともいずれかを制御する制御装置と、をモバイルネットワーク上に備え、
前記制御装置は、前記端末からのコンテンツ要求メッセージに含まれる情報に基づいて、前記端末の画面解像度を判別し、該画面解像度のコンテンツを蓄積す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選択し、選択したキャッシュサーバにコンテンツを配信するように指示し、
前記複数のキャッシュサーバは、それぞれ、前記端末から受信した信号に基づいて、コンテンツを送出する際のビットレートを計算するビットレート計算部と、
前記端末から要求されたコンテンツのファイルまたはストリームであって、前記画面解像度を有し、前記ビットレート以下のものを読み出し、所定のプロトコルのパケットに格納して出力する送信部と、を備える。
管理コンテンツを蓄積する蓄積装置とユーザ端末との間で送受信されるパケットを転送する、複数のパケット転送装置のうちの少なくともいずれかに接続された複数のキャッシュサーバが、それぞれ、前記管理コンテンツの少なくとも一部を一時的に蓄積する工程と、
制御装置が、前記端末からのコンテンツ要求メッセージに含まれる情報に基づいて、前記端末の画面解像度を判別する工程と、
前記制御装置が、前記画面解像度のコンテンツを蓄積す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選択し、選択したキャッシュサーバにコンテンツを配信するように指示する工程と、
前記複数のキャッシュサーバのうちの前記制御装置から指示を受けたキャッシュサーバが、前記端末から受信した信号に基づいて、コンテンツを送出する際のビットレートを計算する工程と、
前記指示を受けたキャッシュサーバが、前記端末から要求されたコンテンツのファイルまたはストリームであって、前記画面解像度を有し、前記ビットレート以下のものを読み出し、所定のプロトコルのパケットに格納して送信する工程と、を含む。
[形態1]
コンテンツ配信システムは、
管理コンテンツを蓄積する蓄積装置と、
前記蓄積装置とユーザの端末との間で送受信されるパケットを転送する複数のパケット転送装置と、
前記管理コンテンツの少なくとも一部を一時的に蓄積する複数のキャッシュサーバと、
前記複数のキャッシュサーバのうちの少なくともいずれかを制御する制御装置と、をモバイルネットワーク上に備え、
前記複数のキャッシュサーバは、それぞれ、前記複数のパケット転送装置のうちの少なくともいずれかに接続され、
前記制御装置は、前記端末からのコンテンツ要求メッセージに含まれる情報に基づいて、前記端末の画面解像度を判別し、該画面解像度のコンテンツを蓄積す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選択し、選択したキャッシュサーバにコンテンツを配信するように指示し、
前記複数のキャッシュサーバは、それぞれ、前記端末から受信した信号に基づいて、コンテンツを送出する際のビットレートを計算するビットレート計算部と、
前記端末から要求されたコンテンツのファイルまたはストリームであって、前記画面解像度を有し、前記ビットレート以下のものを読み出し、所定のプロトコルのパケットに格納して出力する送信部と、を備える。
[形態2]
前記ビットレート計算部は、前記端末から受信したTCP応答信号またはECN(Explicit Congestion Notification)信号に基づいて、前記ビットレートを計算するようにしてもよい。
[形態3]
前記ビットレート計算部は、所定のパケットを前記送信部から送信した時刻と該所定のパケットに対するTCP応答信号を前記端末から受信した時刻との差としてパケットの応答時間を計測し、該応答時間に基づいて前記ビットレートを計算するようにしてもよい。
[形態4]
前記ビットレート計算部は、前記端末からECN信号を受信した場合には、ビットレートを所定量だけ低減するか、または、ゼロとするようにしてもよい。
[形態5]
前記制御装置は、前記画面解像度のコンテンツを蓄積す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複数抽出するとともに、抽出した複数のキャッシュサーバの中から前記端末の在圏情報に応じてキャッシュサーバを選択するようにしてもよい。
[形態6]
前記複数のパケット転送装置は、それぞれ、モバイルパケットネットワークにおけるSGSN装置、GGSN装置もしくはSGSN/GGSN装置、または、モバイルLTE/EPCネットワークにおけるS-GW装置、P-GW装置もしくはS/P-GW装置であってもよい。
[形態7]
前記管理コンテンツは、動画、静止画、音声、オーディオ、ソフトウェア、アプリケーションおよびデータの少なくともいずれかを含んでいてもよい。
[形態8]
コンテンツ配信方法は、
蓄積装置が管理コンテンツを蓄積する工程と、
前記蓄積装置とユーザ端末との間で送受信されるパケットを転送する複数のパケット転送装置のうちの少なくともいずれかにそれぞれ接続された複数のキャッシュサーバが、それぞれ、前記管理コンテンツの少なくとも一部を一時的に蓄積する工程と、
制御装置が、前記端末からのコンテンツ要求メッセージに含まれる情報に基づいて、前記端末の画面解像度を判別する工程と、
前記制御装置が、前記画面解像度のコンテンツを蓄積す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選択し、選択したキャッシュサーバにコンテンツを配信するように指示する工程と、
前記複数のキャッシュサーバのうちの前記制御装置から指示を受けたキャッシュサーバが、前記端末から受信した信号に基づいて、コンテンツを送出する際のビットレートを計算する工程と、
前記指示を受けたキャッシュサーバが、前記端末から要求されたコンテンツのファイルまたはストリームであって、前記画面解像度を有し、前記ビットレート以下のものを読み出し、所定のプロトコルのパケットに格納して送信する工程と、を含む。
[形態9]
上記コンテンツ配信方法において、前記指示を受けたキャッシュサーバは、前記端末から受信したTCP応答信号またはECN(Explicit Congestion Notification)信号に基づいて、前記ビットレートを計算するようにしてもよい。
[形態10]
上記コンテンツ配信方法において、前記指示を受けたキャッシュサーバは、所定のパケットを前記送信部から送信した時刻と該所定のパケットに対するTCP応答信号を前記端末から受信した時刻との差としてパケットの応答時間を計測し、該応答時間に基づいて前記ビットレートを計算するようにしてもよい。
[形態11]
上記コンテンツ配信方法において、前記指示を受けたキャッシュサーバは、前記端末からECN信号を受信した場合には、ビットレートを所定量だけ低減するか、または、ゼロとしてもよい。
[形態12]
上記コンテンツ配信方法において、前記制御装置は、前記画面解像度のコンテンツを蓄積す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複数抽出するとともに、抽出した複数のキャッシュサーバの中から前記端末の在圏情報に応じてキャッシュサーバを選択するようにしてもよい。
図1~図4を参照して、第1の実施形態に係るコンテンツ配信システムの構成と動作について詳細に説明する。
図5を参照して、第2の実施形態に係るコンテンツ配信システムの構成と動作について詳細に説明する。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。
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 コンテンツリスト作成部
120 蓄積装置
150 モバイルネットワーク
160 制御装置
161 制御信号送受信部
164 ユーザデータ
165 ポリシ装置
167 コンテンツマップ作成・蓄積部
170 携帯端末
180_1~180_M、181_1~181_M、182_1~182_M、183_1~183_M 基地局
186 解像度判別部
187 キャッシュサーバ選択部
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 ビットレート計算部
203 獲得部
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 (12)
- 管理コンテンツを蓄積する蓄積装置とユーザの端末との間で送受信されるパケットを転送する、複数のパケット転送装置のうちの少なくともいずれかに接続され、前記管理コンテンツの少なくとも一部を一時的に蓄積する複数のキャッシュサーバと、
前記複数のキャッシュサーバのうちの少なくともいずれかを制御する制御装置と、をモバイルネットワーク上に備え、
前記制御装置は、前記端末からのコンテンツ要求メッセージに含まれる情報に基づいて、前記端末の画面解像度を判別し、該画面解像度のコンテンツを蓄積す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選択し、選択したキャッシュサーバにコンテンツを配信するように指示し、
前記複数のキャッシュサーバは、それぞれ、前記端末から受信した信号に基づいて、コンテンツを送出する際のビットレートを計算するビットレート計算部と、
前記端末から要求されたコンテンツのファイルまたはストリームであって、前記画面解像度を有し、前記ビットレート以下のものを読み出し、所定のプロトコルのパケットに格納して出力する送信部と、を備える、コンテンツ配信システム。 - 前記ビットレート計算部は、前記端末から受信したTCP(Transmission Control Protocol)応答信号またはECN(Explicit Congestion Notification)信号に基づいて、前記ビットレートを計算する、請求項1に記載のコンテンツ配信システム。
- 前記ビットレート計算部は、所定のパケットを前記送信部から送信した時刻と該所定のパケットに対するTCP応答信号を前記端末から受信した時刻との差としてパケットの応答時間を計測し、該応答時間に基づいて前記ビットレートを計算する、請求項2に記載のコンテンツ配信システム。
- 前記ビットレート計算部は、前記端末からECN信号を受信した場合には、ビットレーを所定量だけ低減するか、または、ゼロとする、請求項2に記載のコンテンツ配信システム。
- 前記制御装置は、前記画面解像度のコンテンツを蓄積す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複数抽出するとともに、抽出した複数のキャッシュサーバの中から前記端末の在圏情報に応じてキャッシュサーバを選択する、請求項1ないし4のいずれか1項に記載のコンテンツ配信システム。
- 前記複数のパケット転送装置は、それぞれ、モバイルパケットネットワークにおけるSGSN(Serving General packet radio service Support Node)装置、GGSN(Gateway General packet radio service Support Node)装置もしくはSGSN/GGSN装置、または、モバイルLTE(Long Term Evolution)/EPC(Evolved Packet Core)ネットワークにおけるS-GW(Serving Gateway)装置、P-GW(Packet data network Gateway)装置もしくはS/P-GW装置である、請求項1ないし5のいずれか1項に記載のコンテンツ配信システム。
- 前記管理コンテンツは、動画、静止画、音声、オーディオ、ソフトウェア、アプリケーションおよびデータの少なくともいずれかを含む、請求項1ないし6のいずれか1項に記載のコンテンツ配信システム。
- 管理コンテンツを蓄積する蓄積装置とユーザ端末との間で送受信されるパケットを転送する、複数のパケット転送装置のうちの少なくともいずれかに接続された複数のキャッシュサーバが、それぞれ、前記管理コンテンツの少なくとも一部を一時的に蓄積する工程と、
制御装置が、前記端末からのコンテンツ要求メッセージに含まれる情報に基づいて、前記端末の画面解像度を判別する工程と、
前記制御装置が、前記画面解像度のコンテンツを蓄積す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選択し、選択したキャッシュサーバにコンテンツを配信するように指示する工程と、
前記複数のキャッシュサーバのうちの前記制御装置から指示を受けたキャッシュサーバが、前記端末から受信した信号に基づいて、コンテンツを送出する際のビットレートを計算する工程と、
前記指示を受けたキャッシュサーバが、前記端末から要求されたコンテンツのファイルまたはストリームであって、前記画面解像度を有し、前記ビットレート以下のものを読み出し、所定のプロトコルのパケットに格納して送信する工程と、を含む、コンテンツ配信方法。 - 前記指示を受けたキャッシュサーバは、前記端末から受信したTCP(Transmission Control Protocol)応答信号またはECN(Explicit Congestion Notification)信号に基づいて、前記ビットレートを計算する、請求項8に記載のコンテンツ配信方法。
- 前記指示を受けたキャッシュサーバは、所定のパケットを前記送信部から送信した時刻と該所定のパケットに対するTCP応答信号を前記端末から受信した時刻との差としてパケットの応答時間を計測し、該応答時間に基づいて前記ビットレートを計算する、請求項9に記載のコンテンツ配信方法。
- 上記コンテンツ配信方法において、前記指示を受けたキャッシュサーバは、前記端末からECN信号を受信した場合には、ビットレートを所定量だけ低減するか、または、ゼロとする、請求項9に記載のコンテンツ配信方法。
- 上記コンテンツ配信方法において、前記制御装置は、前記画面解像度のコンテンツを蓄積す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複数抽出するとともに、抽出した複数のキャッシュサーバの中から前記端末の在圏情報に応じてキャッシュサーバを選択する、請求項8ないし11のいずれか1項に記載のコンテンツ配信方法。
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