WO2008029471A1 - Système de sortie vidéo simultanée en multidiffusion - Google Patents

Système de sortie vidéo simultanée en multidiffusion Download PDF

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Publication number
WO2008029471A1
WO2008029471A1 PCT/JP2006/317744 JP2006317744W WO2008029471A1 WO 2008029471 A1 WO2008029471 A1 WO 2008029471A1 JP 2006317744 W JP2006317744 W JP 2006317744W WO 2008029471 A1 WO2008029471 A1 WO 2008029471A1
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WO
WIPO (PCT)
Prior art keywords
transmission
information
network
control information
buffer control
Prior art date
Application number
PCT/JP2006/317744
Other languages
English (en)
Japanese (ja)
Inventor
Masaaki Miura
Kazuki Narita
Hiroaki Matsushima
Original Assignee
Media Global Links Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Media Global Links Co., Ltd. filed Critical Media Global Links Co., Ltd.
Priority to PCT/JP2006/317744 priority Critical patent/WO2008029471A1/fr
Publication of WO2008029471A1 publication Critical patent/WO2008029471A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1881—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with schedule organisation, e.g. priority, sequence management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/611—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for multicast or broadcast
    • 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
    • H04N21/242—Synchronization processes, e.g. processing of PCR [Program Clock References]
    • 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
    • H04N21/64—Addressing
    • H04N21/6405—Multicasting

Definitions

  • a multicast system having a network and a plurality of transmission devices connected to the network, wherein when the plurality of transmission devices acquire and buffer the same video information, This is related to a multicast system that simultaneously outputs the same output video information.
  • Patent Document 1 Japanese Patent Laid-Open No. 2005-286449
  • the transmission terminal device detects the transmission time to each reception terminal device, and compares the detected transmission times with each other. It is characterized by calculating the time lag of the playback timing between the receiving side terminal devices and sending it after adding it to the video data or audio data.
  • time shift information must be added to each receiving terminal device. Needed a large bandwidth.
  • a multicast system having a network and a plurality of transmission devices connected to the network, from one transmission device to a plurality of transmission devices
  • a multi-cast system is proposed in which the same video information is transmitted, and the receiving side transmission device acquires buffer control information and performs buffer control when buffering the acquired video information.
  • the multicast system further includes a management device.
  • the management device acquires transmission / reception transmission device identification information for identifying the transmission / reception transmission device, and further acquires network delay information that is delay information of a transmission route between the transmission / reception transmission devices.
  • the buffer control information corresponding to the receiving transmission apparatus may be generated and transmitted based on the acquired network delay information.
  • the receiving-side transmission device acquires time information as buffer control information, has a synchronous clock that synchronizes with other transmission devices, and performs buffer control based on the clock information and time information of the synchronous clock. It does not matter.
  • the network may be a duplex network. When the network is duplicated, the management device generates buffer control information for each route, and the transmission device acquires the buffer control information for each transmission route. Good.
  • the same video data and the like can be simultaneously output from a plurality of receiving side transmission apparatuses that receive the video data and the like.
  • the transmission apparatus on the sending side does not need to use an extra bandwidth that is not necessary to transmit buffer control information together with the video data.
  • This embodiment is a multicast system having a network and a plurality of transmission devices connected to the network, and the same video information is transmitted from one transmission device to the plurality of transmission devices.
  • a multicast system in which the sending and receiving side transmission apparatus acquires buffer control information and performs buffer control when buffering the acquired video information will be described.
  • FIG. 1 is a conceptual diagram of a multicast system according to the present embodiment.
  • the transmission side transmission device 010 la which is a transmission station, multi-casts video information to three reception side transmission devices (0101b, 0101c, OlOld) and receives three receptions.
  • the purpose of the side transmission equipment is to output the same video information to the outside at the same time. For example, this is the case when the same video information is to be broadcast all at once on each receiving side transmission device. However, a network delay corresponding to each transmission path occurs until the video information reaches the three receiving transmission devices.
  • the transmission device 01 01b has the shortest network delay of 2 ms (milliseconds), the transmission device 0101c has a network delay of 5 ms, and the transmission device OlOld has a network delay of 7 ms.
  • the transmission apparatus has a notch for temporarily storing the received video information, and outputs the buffered video information after a predetermined time has elapsed.
  • the buffer control information which is information for buffer control
  • the buffer control information generated by the management device (0102) is transmitted to each receiving-side transmission device (0101b, 0101c, OlOld), and each transmission device has its own buffer based on the transmitted buffer control information. Take control. This makes it possible to simultaneously output the same video information from multiple transmission devices.
  • the transmission apparatus 0101a outputs one video information and the routing device (0103a) arranged in the network 0103b) may be multicast by duplicating the video information, or by transmitting the same video information from the transmission side transmission device 0101a to a plurality of reception side transmission devices all at once. It ’s going to be multicast.
  • FIG. 2 illustrates a functional block diagram of a transmission apparatus in the multicast system according to the present embodiment.
  • the multicast system according to the present embodiment includes a network and a plurality of transmission devices (0200) connected to the network.
  • the transmission device (0200) includes a “sending unit” (0201), an “acquisition unit” (0202), a “buffer unit” (0203), an “output unit” (0204), and a “buffer control information acquisition unit”. (0205).
  • FIG. 17 shows a detailed configuration example of the transmission apparatus.
  • the transmission device (1700) has lZF (1701a, 1701b) for inputting / outputting data to / from the network.
  • the network is an optical communication line and the input / output IZF is an optical line IZF.
  • the optical communication line is duplexed and has two EAST system input / output IZF (1701a) and WEST system input / output IZF (1701b) is illustrated.
  • It also has one or more VIDEO IZFs (1702) for inputting and outputting video information. For example, it can input video information to other devices or output video information to other devices. it can.
  • VIDEO I / F (1702) includes a notapart and a buffer control information acquisition part.
  • FIG. 17 shows an example of the configuration of the transmission apparatus, and the present invention is not limited to this. For example, a plurality of VIDEO IZFs may be provided.
  • each part which is a component of the present invention described in detail below, is configured by hardware, software, or both hardware and software.
  • hardware composed of a CPU, a bus, a memory, an interface, a peripheral device, etc.
  • software that can be executed on the hardware.
  • the functions of each unit can be realized by processing, storing, and outputting data on the memory and data input via the interface by sequentially executing the program expanded on the memory.
  • the “sending unit” (0201) has a function of sending video information to the network. That is, When the transmission apparatus is a transmission apparatus on the transmission side that transmits video information to another transmission apparatus, such as the transmission station (0101a) in FIG. 1, the transmission unit transmits the video information.
  • the term “multicast” as used herein may mean that the same video information is transmitted to a plurality of receiving-side transmission devices at the same time. And the same video information may be transmitted multiple times by duplicating the video information by one or more routing devices arranged in the network. More specifically, as illustrated in FIG. 3, video information multicasted from the transmission unit (0301a) of the transmission apparatus A serving as a transmission station to a plurality of transmission apparatuses is transmitted from the reception-side transmission apparatus. Each acquisition device (0302b, 0302c, 0302d) for device B, transmission device C, and transmission device D will be acquired. The acquisition unit will be described in detail later.
  • the "network” is not limited to a specific communication range, communication method, or the like.
  • Various networks such as the Internet, LAN (Local Area Network), and WAN (Wide Area Network) are assumed. Further, regardless of wired communication or wireless communication, there can be various communication methods such as optical communication and infrared communication.
  • Video information is information including video data, audio data, character data, and the like.
  • the transmission destination for sending video information is assumed to be a transmission device other than itself. However, it may be transmitted to another transmission apparatus after being mediated by another apparatus, or may be transmitted directly to another transmission apparatus.
  • the video information may be stored in a storage device such as an HDD in the transmission device, or the transmission device receives and transmits the video information stored in the storage device in another device. It may be.
  • the transmission unit corresponds to the optical line IZF (17 01a, 1701b). More specifically, the transmission unit has a function of transmitting video information acquired from the outside by VIDEO l / F (1702) from the optical line lZF (1701a, etc.).
  • the sending unit may include a program for causing the CPU to execute such processing.
  • the "acquisition unit” (0202) has a function of acquiring video information transmitted from a transmission-side transmission device, which is another transmission device that transmits video information, from a network.
  • Transport side transmission device power that is another transmission device that sends video information refers to the video sent from the transmission unit of the transmission side transmission device that becomes the transmission station (0101a) in FIG. Information Meaning.
  • the transmission apparatus on the receiving side is the transmission apparatus 0101b, OlOlc, 010 Id in FIG. 1, and when the video information is acquired from the transmission station (0101a), the video information is acquired from this acquisition unit.
  • the video information may be directly transmitted from the sending side transmission device or may be transmitted via another device.
  • the acquisition unit corresponds to the optical line lZF (1701a, 1701b) in FIG. More specifically, the acquisition unit plays a role of transmitting video information, which has also acquired an external force through the optical line lZF (1701a, 1701b), to a notifier unit (0203) described later.
  • the acquisition unit includes a program for causing the CPU to execute such processing!
  • the “buffer unit” (0203) has a function of buffering the acquired video information.
  • “Acquired video information” refers to the video information acquired by the acquisition unit (0202).
  • FIG. 4 is a diagram illustrating the buffer unit.
  • transmission device B, transmission device C, and transmission device D correspond to transmission device 0101b, transmission device 0101c, and transmission device OlOld in FIG. 1, respectively.
  • transmission device B has the smallest network delay
  • transmission device D has the largest network delay.
  • transmission apparatus B buffers video information in buffer 0401b, transmission apparatus C buffers buffer 0401c, and transmission apparatus D buffers buffer 0401d.
  • Each buffer is a FIFO (First In First Out).
  • video information is input from the left and output from the right. In other words, the data on the right is older.
  • Fig. 4 shows an example of the buffer state of each receiving transmission device at a certain time, and the hatched portion of each buffer indicates buffered video information. Since each receiving-side transmission device has a different network delay amount, the transmission device B with the smallest network delay buffers the most video information in order to obtain the video information first among the three parties. Will be.
  • the transmission apparatus D having the largest network delay buffers the video information with the least amount in order to acquire the video information the slowest among the three parties. That is, the difference 0402 is the difference in video information amount for the network delay between the transmission apparatuses B and C, and the difference 0403 is the difference in video information amount for the network delay between the transmission apparatuses B and D. These three simultaneously output video information at the output unit (0204) described later. In order to do this, the transmission apparatus B must wait until the transmission apparatus D receives and buffers the video information, and waits until the transmission apparatus D receives and buffers the video information in the buffer 0401b. Continue to do.
  • the buffer of transmission device B needs to have at least a capacity for buffering the amount of video information corresponding to the difference obtained by subtracting the network delay of transmission device D itself.
  • a transmission apparatus with the largest network delay such as transmission apparatus D, obtains it at the obtaining section (0202), which does not necessarily need to buffer video information, and directly outputs it from the output section (0204).
  • the “output unit” (0204) has a function of outputting buffered video information.
  • “Buffered video information” is video information buffered by the buffer unit (0203).
  • “Output buffered video information” means that when the transmission device is the transmission device 0101b, transmission device 0101c, or transmission device OlOld in FIG. 1, the received and buffered video information is output. It is.
  • the output section corresponds to VIDEO IZF (1702) in FIG.
  • the output unit may include a program for causing the CPU to execute processing for outputting video information.
  • At least one or more routing devices are arranged in the network, and the video information output from the output unit (0204) by the plurality of transmission devices at the same time is duplicated by the routing device arranged in the network.
  • the acquisition unit (0202) may acquire the information from the network.
  • transmission device B, transmission device C, and transmission device D are receiving-side transmission devices, and that network delay is the largest in transmission device B in transmission device B and the smallest in network delay.
  • a buffer amount corresponding to the network delay is set for each transmission device.
  • the delay buffer amount of transmission device B is 10 (0601)
  • the delay buffer amount of transmission device C is 6 (0602)
  • the delay buffer amount of transmission device D is 3 (0603).
  • the video information has been received and buffered by the transmission apparatuses B and C, but the video information has still arrived at the transmission apparatus D. .
  • the video information reaches the transmission device D and begins to be buffered.
  • the video information is continuously filtered to the transmission apparatuses B and C.
  • the video information power S buffering is continued in each transmission device, as shown in (c)
  • the video information of the delay buffer amount is buffered in each transmission device and output from P01 of the first packet. It becomes.
  • video information output from each transmission device is output at the same timing. In other words, video information is output at the same timing as each transmission device simply by specifying a delay buffer amount corresponding to the network delay for each transmission device.
  • the multicast system can simultaneously output the same video data and the like in a plurality of reception-side transmission devices that receive the video data and the like.
  • the transmission apparatus on the sending side does not need to use an extra band that does not need to transmit buffer control information together with the video data.
  • the present embodiment is a multicast system that further includes a management device, and the management device acquires transmission / reception transmission device identification information that identifies a transmission-side transmission device that transmits video information and a reception-side transmission device. In addition, it acquires network delay information, which is delay information on the transmission route between the transmission and reception transmission devices, and generates and transmits buffer control information corresponding to the receiving transmission device based on the network delay information.
  • the characteristic multicast system will be explained.
  • FIG. 7 illustrates a functional block diagram of the multicast system according to the present embodiment.
  • the multicast system according to this embodiment has a transmission device (0700) and a management device (0720). To do.
  • the transmission device (0700) includes a “sending unit” (0701), an “acquiring unit” (0702), a “buffer unit” (0703), an “output unit” (0704), and a “buffer control information acquiring unit”. (0705). Since the configuration of the transmission device (0700) is the same as the configuration of the transmission device according to the first embodiment, a description thereof is omitted here.
  • the management device (0720) includes a “transmission device specific information acquisition unit” (0706), a “network delay information acquisition unit” (0707), a “buffer control information generation unit” (0708), and a “buffer control information transmission unit” (0709).
  • the “network delay information acquisition unit” (0707) has a function of acquiring network delay information that is delay information of a transmission route between transmission and reception transmission apparatuses.
  • Network delay information is mainly information relating to the network delay between the respective transmission apparatuses, but particularly information relating to the network delay in the path from the transmission apparatus on the transmission side to each transmission apparatus.
  • FIG. 9 is a specific example of the network delay information, and shows the network delay time in the path from the transmission apparatus A to each transmission apparatus when the transmission apparatus on the transmission side is the transmission apparatus A.
  • Figure 11 shows an example of how to obtain such network delay information.
  • the management device (1101) sends the information to the transmission device A (1102).
  • transmission device A (1102) transmits network delay measurement data to each transmission device.
  • the time stamp (1104) is stored in a memory or the like in transmission device A ( Alternatively, a time stamp may be written in the data to be transmitted).
  • each transmission device When each transmission device receives data for measuring network delay, it writes the time stamp (1105b, 1105c, 1105d) at the time of reception into the received data and returns it to transmission device A.
  • the transmission device A receives data from each transmission device, knows the time (network delay time) until the data reaches each transmission device by the time stamp written in the data.
  • the transmission apparatus A When the transmission apparatus A has received all the transmission apparatus power data, it transmits these network delay times (1106) together to the management apparatus (1101).
  • the management device (1101) stores the received network delay time (1106) in a storage device such as a memory.
  • the management device must be prepared, and all the transmission device powers can cause other transmission devices to perform the processing shown in Fig. 11.
  • network delay information to other transmission devices may be measured when each transmission device becomes a transmission device on the transmission side.
  • the network delay information acquisition unit includes a program that allows the CPU to execute such processing!
  • the “buffer control information generation unit” (0708) has a function of generating buffer control information corresponding to each transmission device based on the acquired network delay information!
  • Figure 10 shows a specific example of buffer control information. Assuming that the acquired network delay information has the contents illustrated in FIG. 9, the buffering time in each transmission apparatus is determined as shown in FIG. In the example of Fig. 10, it is assumed that the transmission device with the largest network delay outputs the acquired video information immediately without buffering. That is, the transmission apparatus with the largest network delay is the transmission apparatus D, and the buffering time of the transmission apparatus D is Oms. Also, since transmission device B has a network delay of 2 ms and transmission device D has a network delay of 7 ms, transmission device B needs to buffer for 5 ms after acquiring video information.
  • the nota control information generator generates buffer control information as shown in FIG. 10 and stores it in a storage device such as a memory. Further, the buffer control information generating unit may include a program for causing the CPU to execute such processing.
  • the “buffer control information transmitting unit” (0709) has a function of transmitting each generated buffer control information to the corresponding transmission device.
  • “Generated buffer control information” is buffer control information generated by the buffer control information generation unit (0708). That is, for example, the buffer control information transmission unit reads buffer control information stored in a storage device such as a memory, and outputs the read buffer control information to the network via the optical line IZF.
  • the nota control information transmission unit may include a program for causing the CPU to execute such processing.
  • the multicast system further includes a management device.
  • the management device generates buffer control information and transmits the buffer control information to the reception-side transmission device. Therefore, the transmission-side transmission device transmits video information. At the same time, video information can be output simultaneously without sending buffer control information. (Embodiment 3)
  • the present embodiment has a timepiece for acquiring time information for controlling timing for outputting video information buffered as buffer control information by the transmission apparatus, and has a synchronous clock that is synchronized with other transmission apparatuses.
  • a multicast system characterized by buffer control based on information and time information will be described.
  • FIG. 12 illustrates a functional block diagram of the transmission device of the multicast system according to the present embodiment.
  • the multicast system according to the present embodiment includes a network and a plurality of transmission devices (1200) connected to the network.
  • the transmission device (1200) includes a “sending unit” (12 01), an “acquiring unit” (1202), a “buffer unit” (1203), an “output unit” (1204), and a “buffer control information acquiring unit”. (1205).
  • the buffer control information acquisition unit (1205) includes a “buffer time control information acquisition unit” (1210) and a “synchronous clock unit” (1211). Since the configuration other than the noffer time control information acquisition unit (1210) and the synchronous clock unit (1211) is the same as the configuration of the multicast system according to the first embodiment, the description thereof is omitted.
  • “Buffer time control information acquisition means” (1210) has a function of acquiring time information as buffer control information.
  • “Time information” mainly corresponds to the time at which each receiving-side transmission apparatus starts buffering. In addition, information other than the time information may be included.
  • FIG. 13 shows a specific example of time information.
  • the “buffering start time” is the time at which video information noffering is started (in addition, the information buffered in the buffer at that time may be deleted to empty the noffer). After that, when a packet indicated by “buffering start packet number” is received, the subsequent packets are buffered.
  • FIG. 14 shows a specific example of processing when such buffer time control information is acquired.
  • the “synchronous clock means” (1211) has a clock that synchronizes with other transmission devices. “Synchronize with other transmission devices” means that there is no time lag with respect to the clock in the other transmission devices. Examples of such synchronous clocks include GPS clocks and NTP (Network Time Protocol). In addition, if the clocks of the transmission devices are not synchronized in this way, the video information will not be output at the same time when the processing as shown in FIG. is there.
  • the transmission device performs the control based on the synchronous clock information acquired from the synchronous clock means (1211) and the time information acquired by the buffer output time control information acquisition means (1210).
  • the “control” refers to buffer control. Specifically, buffer control as shown in FIG. 14 is applicable.
  • a multicast system characterized in that the network is a duplicated network will be described.
  • the management device when the network is duplicated, the management device generates buffer control information for each transmission path, and the transmission device A multicast system characterized by acquiring buffer control information for each path is also described.
  • the configuration of the multicast system according to the present embodiment is the same as the configuration of the multicast system according to any one of the first to third embodiments.
  • the network is a duplicated network.
  • Duplexed network means that, for example, as shown in FIG. 15, two networks are configured between the transmission device and the transmission device. If you can. In this case, even if one path cannot transmit video information due to some trouble, the video information can be transmitted via the other path.
  • the buffer control information generation unit of the management device when the multicast system has a management device, the buffer control information generation unit of the management device generates buffer control information for each path of the duplexed transmission line, and the buffer of the transmission device.
  • the control information acquisition unit may acquire the buffer control information through each path of the duplexed transmission line. For example, if the two networks illustrated in FIG. 15 are “network 1” and “network 2”, the nofering when video information is transmitted through the route of network 1 as illustrated in FIG. It includes the time and buffering time when video information is transmitted through the network 2 path. In addition, if the buffer control information for each path can be acquired in this way, it is possible to perform processing such as controlling the network so that the video information is transmitted through the path with less buffer time.
  • the transmission apparatus can acquire buffer control information for each transmission path, so for example, the path with the smaller network delay is used for transmission of video information. It is also possible to control the network to do so.
  • FIG. 1 is a conceptual diagram of a multicast system according to Embodiment 1.
  • FIG. 2 is a functional block diagram of a multicast system according to Embodiment 1.
  • FIG. 6 Example in the multicast system according to Embodiment 1.
  • FIG. 7 is a functional block diagram of a multicast system according to Embodiment 2.
  • FIG. 12 is a functional block diagram of a multicast system according to the third embodiment.
  • FIG.14 Specific example of buffer control based on synchronous clock information and time information.
  • FIG.15 Example diagram when the network is duplicated.

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  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La présente invention concerne la multidiffusion de la même information vidéo depuis un dispositif de transmission côté transmission vers une pluralité de dispositifs de transmission côté réception, laquelle pluralité de dispositifs de transmission côté réception réalisent la sortie simultanée. Dans cette invention, il est possible de ne pas transmettre l'information concernant un retard de réseau du dispositif transmission côté transmission et d'aligner les synchronisations de sortie simultanée de la pluralité de dispositifs de transmission côté réception sans avoir besoin d'une bande/ligne supplémentaire. En vue d'atteindre cet objectif, l'invention concerne un système de multidiffusion incluant un réseau et une pluralité de dispositifs de transmission connectés au réseau. La même information vidéo est envoyée depuis un dispositif de transmission vers une pluralité de dispositifs de transmission. En acquérant l'information de commande de tampon, un dispositif de transmission côté réception réalise une commande de tampon en mettant en tampon l'information vidéo acquise.
PCT/JP2006/317744 2006-09-07 2006-09-07 Système de sortie vidéo simultanée en multidiffusion WO2008029471A1 (fr)

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