WO2016067561A1 - Terminal de communication, système de communication, procédé de communication et support d'informations lisible par ordinateur sur lequel un programme informatique a été mémorisé - Google Patents

Terminal de communication, système de communication, procédé de communication et support d'informations lisible par ordinateur sur lequel un programme informatique a été mémorisé Download PDF

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Publication number
WO2016067561A1
WO2016067561A1 PCT/JP2015/005277 JP2015005277W WO2016067561A1 WO 2016067561 A1 WO2016067561 A1 WO 2016067561A1 JP 2015005277 W JP2015005277 W JP 2015005277W WO 2016067561 A1 WO2016067561 A1 WO 2016067561A1
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WIPO (PCT)
Prior art keywords
data
content
retransmission
communication terminal
loss
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PCT/JP2015/005277
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English (en)
Japanese (ja)
Inventor
則夫 山垣
啓文 植田
ブンパデイット カンニヤウオン
峻一 木下
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日本電気株式会社
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Priority to JP2016556205A priority Critical patent/JPWO2016067561A1/ja
Publication of WO2016067561A1 publication Critical patent/WO2016067561A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals

Definitions

  • the present invention relates to a distribution control technique for distributing content data.
  • Download distribution is performed after downloading the content file to the user's communication terminal. For this reason, the download distribution cannot be performed unless the file download is completed.
  • streaming distribution plays sequentially while downloading content files. For this reason, streaming distribution is suitable for real-time distribution in which a user requests distribution of a desired stream type content, such as video on demand, and sequentially reproduces while receiving content data constituting the requested content. Yes. However, in streaming distribution, if retransmission of data lost due to packet loss or the like that occurs during communication is not in time for the reproduction time, the video of that portion is skipped or stopped.
  • Progressive distribution can be played sequentially while downloading content files. However, in the case of progressive distribution, when packet loss or the like occurs, retransmission stops until the data is distributed as in download distribution.
  • RTP Real-time Transport Protocol
  • RTP is a data communication method in which reproduction is performed while ensuring real-time properties by referring to time information stored in a packet at a receiving terminal.
  • RTP focuses on ensuring real-time performance and does not guarantee data reliability such as packet loss.
  • TCP Transmission Control Protocol
  • TCP Transmission Control Protocol
  • FEC Forward Error Correction, forward error correction
  • FEC is a method of adding redundant data corresponding to the communication status to each packet, and restoring data of that portion from the redundant data when a data loss or error occurs.
  • FEC cannot restore all data when more losses or errors than expected occur, resulting in data loss.
  • Patent Document 1 discloses a method of transmitting a retransmission request for data based on a reproduction time as an operation when content data is lost due to packet loss or the like during communication as described above. In this method, if the lost data is reproduced in time, a retransmission request for the data is transmitted. And this system suppresses retransmission of unnecessary data by skipping transmission of a retransmission request of lost data that is not in time for the reproduction time even if it is retransmitted.
  • Patent Document 2 discloses a processing method in a packet transmission apparatus that receives a retransmission request when a loss occurs in content data and a retransmission request is transmitted. This apparatus obtains the estimated arrival time when a packet requested to be retransmitted is retransmitted, and sets that the importance of the packet determined to be in time for the reproduction time is high. And this apparatus transmits in order from a packet with high importance.
  • Patent Document 3 discloses a method for controlling the quality of content data according to the communication status between the transmitting and receiving terminals and distributing the data, and transferring the remaining data later.
  • the content data is thinned out according to the communication status between the transmitting and receiving terminals and distributed as, for example, a low quality video.
  • the transmitting terminal distributes the remaining thinned content data
  • the receiving terminal that receives the distribution reconstructs the content data as a high quality video.
  • the user can view a video without skipping or stopping. Then, after receiving the remaining data distributed later, the user can view the high-quality video.
  • Patent Document 1 The method disclosed in Patent Document 1 is effective for efficient content download and reproduction because a retransmission request is transmitted only for loss data in time for reproduction time, and retransmission of loss data in time for reproduction time is suppressed.
  • this method does not have a mechanism for acquiring loss data that has been determined to be in time for the playback time and has not transmitted a retransmission request. For this reason, even if the content is viewed again, the quality of the content is equivalent to that at the first viewing time. In addition, when distributing to other terminals, the quality may further deteriorate due to the generation of loss data.
  • the method disclosed in Patent Document 3 distributes content data whose quality is degraded by thinning out the content data according to the state of the communication path.
  • the remaining thinned data is distributed.
  • this method does not affect the viewing and distribution to other terminals.
  • the state of the communication path changes from moment to moment, it is conceivable that data to be transmitted after thinning is lost. This method is not considered in such a case.
  • the time until all content data is collected at the receiving terminal becomes longer depending on the reproduction time of the content to be distributed. Therefore, when content data is reproduced (viewed) while being downloaded and further distributed to another terminal, the terminal distributes low-quality content data.
  • an object of the present invention is to provide a communication terminal or the like that can satisfactorily control retransmission of lost data when content data is lost in distribution of content data between terminals. .
  • a communication terminal has the following configuration.
  • the communication terminal is Reproduction processing means for reproducing content data; Transmitting the content data received from another terminal to the reproduction processing means; Data transmission / reception means for instructing to request retransmission when loss data occurs in the received content data; In response to an instruction from the data transmission / reception means, if there is a possibility that the retransmission of the loss data may be in time for the scheduled reproduction time of the content data by the reproduction processing means, a retransmission request for requesting retransmission of the loss data is sent.
  • Retransmission control means for requesting retransmission to other terminals holding the loss data in order from the loss data having a higher priority and higher priority.
  • a communication system that achieves the same object is as follows.
  • the communication terminals described above are connected so as to communicate with each other.
  • a communication method that achieves the same object is as follows.
  • loss data occurs in the received content data
  • the priority of the retransmission request for the loss data is increased, and the priority is increased.
  • another terminal that holds the loss data is requested to retransmit.
  • a communication terminal having the above configuration or a computer program for realizing the communication method by a computer, and a computer-readable storage medium storing the computer program.
  • the present invention in the distribution of content data between terminals, when a loss occurs in the content data, it is possible to effectively control the retransmission of the lost data.
  • FIG. 1 is a block diagram illustrating a configuration of a wireless communication system including a plurality of communication terminals according to the first embodiment of the present invention.
  • communication terminals 100a to 100h are shown as examples of communication terminals. However, the communication terminals 100a to 100h are collectively referred to as the communication terminal 100 because they have the same configuration.
  • the communication terminal 100 has a wireless communication function.
  • the wireless communication function is, for example, a connection function of a wireless LAN (Local Area Network, Wi-Fi (registered trademark, also referred to as Wireless Fidelity)). It is assumed that the communication terminals 100 included in the wireless communication system can communicate with each other in the ad hoc mode, for example. Further, each of the communication terminals 100a to 100h may be configured to be connected to a wired communication network and communicate with each other via the wired communication network.
  • Wi-Fi Registered trademark, also referred to as Wireless Fidelity
  • FIG. 2 is a block diagram illustrating the configuration of the communication terminal 100 according to the first embodiment of the present invention.
  • the configuration shown in FIG. 2 is an example, and the first embodiment of the present invention is not limited to the communication terminal shown in FIG.
  • the direction of the arrow in the drawing shows an example, and does not limit the direction of the signal between the blocks.
  • the communication terminal 100 includes an input / output unit 110, a reproduction processing unit 120, a content distribution control unit 130, a storage unit 140, and a communication unit 150.
  • the input / output unit 110 is an input / output device such as a display, a camera, a microphone, a software keyboard, and a touch panel provided in the communication terminal 100. These input / output devices may be connected to the communication terminal 100 by cables.
  • the reproduction processing unit 120 and the content distribution control unit 130 are, for example, a CPU (Central Processing Unit) that executes processing according to program control.
  • the reproduction processing unit 120 and the content distribution control unit 130 are CPUs that execute processing in accordance with control of application software that operates based on an OS (Operating System) installed in the communication terminal 100, for example.
  • OS Operating System
  • the storage unit 140 is a storage medium such as a memory controlled by a CPU, for example.
  • the communication unit 150 is, for example, a network processing unit or a wireless LAN communication module that performs the following processing.
  • -Transport layer processing such as TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) controlled by the OS kernel
  • -Network layer processing such as IP (Internet Protocol) and processing such as MAC (Media Access Control).
  • the storage unit 140 stores communication terminal information 141 and content information 142.
  • the storage unit 140 also stores content data (not shown).
  • the content data may be a stream type data file such as audio or video, or may be a part of the stream type data.
  • the content data may be a part of data shot or recorded through the camera or microphone of the input / output unit 110. What is stored in the storage unit 140 of the communication terminal 100 may simply be stored in the communication terminal 100.
  • Each communication terminal 100 has a communication terminal identifier indicating the transmission source communication terminal 100 and information on content data stored in the storage unit 140 (hereinafter, also referred to as a content list), if necessary, or as necessary.
  • the communication terminal identifier is an identifier that can uniquely identify a communication terminal such as an IP address, a user name, or a communication terminal name.
  • the content list is generated by listing the content identifier composed of the content data held by the communication terminal 100 of the transmission source and the range of the data held by the content for all the held content and listing it. It is a thing.
  • the content identifier is also referred to as a content identifier or a content name.
  • the range of data held by the content can be expressed by, for example, a set of the minimum offset and the maximum offset from the top data among the content data constituting the content.
  • a video data compression technique called MPEG (Moving Picture Experts Group) is often used.
  • MPEG Motion Picture Experts Group
  • video content data is processed in units of groups called GOP in which various frames of I frame, P frame, and B frame, and a certain number of them are collected.
  • I of the above-mentioned I frame is an abbreviation for Intra Picture.
  • P in the above-described P frame is an abbreviation for Predictive Picture.
  • B in the above-described B frame is an abbreviation for Bidirectionally Predictive Picture.
  • the above-mentioned GOP is an abbreviation for Group Of Picture. Identifiers assigned in advance to these frames and GOPs may be used to specify the range of retained data. That is, as long as the communication terminal 100 can recognize the range of content data held by another communication terminal 100, the method of expressing the range of held data is not limited.
  • the range of retained data is referred to as the retained data range.
  • the communication terminal 100 stores the communication terminal information 141 in the storage unit 140 based on the control message received from the other communication terminal 100.
  • FIG. 3 is a diagram illustrating communication terminal information 141 of the storage unit according to the first embodiment of the present invention.
  • the communication terminal information 141 includes a communication terminal identifier 141A, an expiration date 141B, and a content list 141C.
  • the communication terminal identifier 141A is an identifier that can uniquely identify the communication terminal 100 that is the transmission source of the control message, for example, by an IP address, a user name, or a communication terminal name.
  • the storage unit 140 of the communication terminal 100 (for example, the communication terminal 100a) stores communication terminal information 141 including a communication terminal identifier 141A indicating other communication terminals 100 (for example, the communication terminals 100b to 100h) that can communicate in the ad hoc mode, for example. Are stored.
  • the expiration date 141B is information indicating the date and time after the elapse of a predetermined time T from the date and time when the control message is received, for example.
  • the communication terminal information 141 including the expiration date 141B is treated as having expired.
  • the communication terminal information 141 may be deleted from the storage unit 140 after the date and time indicated by the expiration date 141B has arrived.
  • the communication terminal information 141 remains in the communication terminal 100a even after the communication terminal 100h indicated by the communication terminal identifier 141A moves to a place where the communication terminal 100a and the communication terminal 100a cannot communicate with each other. Will continue to be stored in the storage unit 140. If the time T is too short, for example, even if the communication terminal 100h indicated by the communication terminal identifier 141A can communicate with the communication terminal 100a in the ad hoc mode, the communication terminal information 141 is stored in the communication terminal 100a. It will be erased from the storage unit 140. Therefore, the time T is appropriately longer than the control message transmission cycle.
  • Content list 141C sets the content list content included in the control message.
  • FIG. 4 is a diagram illustrating content information 142 of the storage unit 140 according to the first embodiment of the present invention.
  • the content information 142 includes a content identifier 142 ⁇ / b> A for all content composed of content data held by the communication terminal 100, and a retained data range 142 ⁇ / b> B.
  • the retained data range 142B is the same as the retained data range of the content list 141C described above.
  • the content distribution control unit 130 includes a message transmission / reception unit 131, a content management unit 132, and a retransmission control unit 133.
  • the message transmission / reception unit 131 transmits / receives a control message to / from the communication terminal 100 that can communicate via the communication unit 150.
  • the message transmission / reception unit 131 generates and broadcasts a control message when a predetermined timing for transmitting a control message arrives, or when a new content is registered or received, for example, as necessary.
  • the message transmission / reception unit 131 creates a content list included in the control message based on the content identifier 142A and the retained data range 142B included in the content information 142 stored in the storage unit 140, for example.
  • the message transmission / reception unit 131 repeatedly transmits a control message at a predetermined cycle or as necessary.
  • the message transmission / reception unit 131 When the content data forming a plurality of contents is stored in the storage unit 140 of the own communication terminal 100, the message transmission / reception unit 131 generates and transmits a control message as shown below, for example. That is, for example, the message transmission / reception unit 131 generates a control message including a content list 141 ⁇ / b> C based on the content identifiers and the retained data ranges of all the content composed of content data stored in the storage unit 140. Further, the message transmission / reception unit 131 does not necessarily generate information related to all contents composed of content data stored in the storage unit 140 as one control message. That is, the message transmission / reception unit 131 may divide the content list into a plurality of pieces, and generate and transmit a plurality of control messages including the divided content lists.
  • the message transmitting / receiving unit 131 adds additional information to each control message when transmitting a plurality of control messages including the divided content list.
  • the additional information is, for example, information indicating that the content list is divided, information indicating the number of the divided content lists included in each control message, and the like. Even if the message transmitting / receiving unit 131 transmits a plurality of control messages based on the additional information, the content identifiers of all the contents composed of the content data stored in the storage unit 140 of the communication terminal 100 and the data range held Can be notified to the communication terminal 100 of the transmission destination.
  • the message transmission / reception unit 131 when the message transmission / reception unit 131 receives the control message, the message transmission / reception unit 131 extracts the communication terminal identifier 141A of the transmission source based on the control message. Then, the message transmission / reception unit 131 generates communication terminal information 141 including the extracted communication terminal identifier 141A, the above-described expiration date 141B, and the content list 141C included in the received control message, and stores the communication terminal information 141 in the storage unit 140. .
  • the message transmitting / receiving unit 131 may perform the following processing when the communication terminal information 141 related to the same communication terminal identifier 141A as the newly generated communication terminal information 141 is already stored in the storage unit 140. That is, the message transmission / reception unit 131 may update the stored content of the communication terminal information 141 with the content of the new communication terminal information 141.
  • the message transmission / reception unit 131 may delete the communication terminal information 141 from which the date and time indicated by the expiration date 141B has arrived from the storage unit 140.
  • the content management unit 132 has a function of transmitting / receiving content data to / from another communication terminal 100 via the communication unit 150 and a function of managing content composed of content data stored in the storage unit 140. .
  • the content management unit 132 performs the following processing based on the content list included in the control message. That is, the content management unit 132 detects the difference between the content stored in the communication terminal 100 that is the transmission source of the control message and the content stored in the communication terminal 100 itself.
  • the content management unit 132 compares the content identifier of the content list included in the control message with the content identifier 142A included in the content information 142 held by the communication terminal 100 in the storage unit 140. . Then, if the content management unit 132 determines that there is a content identifier included in the received control message that is not included in the content information 142 held by the self-communication terminal 100, the content management unit 132 stores the content in the input / output unit 110, for example. Display on the display to notify the user.
  • FIG. 5 is a diagram illustrating a display image of the input / output unit 110 of the communication terminal according to the first embodiment of the present invention.
  • the first type of content name is the content name (content identifier) of the content held by the own communication terminal 100.
  • Another type of content name is a content name (content identifier) that is not owned by the own communication terminal 100 but is included in a control message received from another communication terminal 100.
  • the input / output unit 110 displays a list of communication terminals 100 that hold the content data that forms the content, and a data range that is held by each communication terminal 100. Also good.
  • the communication terminal 100 owns (stores) content data constituting the content selected to be played back, the communication terminal 100 plays back the content data by the playback processing unit 120, and the content shown in FIG. Display in the display area to make it viewable.
  • the communication terminal 100 distributes the content data to another communication terminal 100 that holds the content data that forms the content. Send a request.
  • the communication terminal 100 receives the content data transmitted in response to the distribution request, reproduces it by the reproduction processing unit 120 while storing the data in the storage unit 140, and displays it in the content display area shown in FIG. It can be viewed by displaying.
  • the communication terminal 100 that has received the content data stores, as the content information 142, information representing the content identifier and the retained data range of the content composed of the received content data.
  • the input / output unit 110 may display a retained data range indicating the range of the content data, so that the user may be able to request that the content be reproduced from a desired position (offset).
  • the content management unit 132 determines whether there is loss data that the communication terminal 100 does not have in the data from the start offset of the content to the offset of the newly received data packet. Check. If there is loss data as a result of the confirmation, the content management unit 132 instructs the retransmission control unit 133 to execute processing for requesting retransmission.
  • the retransmission control unit 133 When the retransmission control unit 133 detects a data loss based on a packet loss or an error during communication in the content data received from the other communication terminal 100, the retransmission control unit 133 determines the priority for the retransmission request of the data. Furthermore, the retransmission control unit 133 requests retransmission from loss data having a high priority according to the loss rate.
  • the data reproduced by the reproduction processing unit 120 after the time obtained by adding the preset time Tr to the current time is determined to be in time for retransmission of loss data due to a retransmission request. As a result, the priority for the retransmission request of the loss data is set high.
  • the retransmission control unit 133 calculates a loss rate, and if the loss rate is larger than a preset threshold, requests retransmission from loss data with a high priority.
  • the loss rate is calculated by the size of the loss data with respect to the data size from the top offset of the content to the maximum offset of the data received so far, and the threshold is set as a number between 0 and 1.
  • retransmission control section 133 requests retransmission in order from loss data having a higher priority with respect to the retransmission request.
  • the transmission destination terminal of the retransmission request may be the communication terminal 100 that is the transmission source of the content data forming the content, or another communication terminal that can determine that the loss data is held based on the communication terminal information 141 100 may be sufficient.
  • the communication unit 150 performs network processing of a transport layer such as a physical layer (PHY: PHYsical Layer), a MAC layer, an IP layer, TCP, or UDP.
  • a transport layer such as a physical layer (PHY: PHYsical Layer), a MAC layer, an IP layer, TCP, or UDP.
  • the communication unit 150 detects reception of a frame (data) in the physical layer, the communication unit 150 inputs data to the content distribution control unit 130 according to network protocol processing such as a MAC layer, an IP layer, and a transport layer.
  • the content distribution control unit 130 assembles the data received by the communication unit 150 and confirms whether the data is data according to the control message. If the data is data corresponding to the control message, the content distribution control unit 130 performs processing when the control message is received.
  • FIG. 6 is a flowchart showing processing in which the communication terminal 100 according to the first embodiment of the present invention receives a control message.
  • Step A1 When the communication terminal 100 receives the control message, the message transmission / reception unit 131 generates the communication terminal information 141 as described above based on the control message and stores it in the storage unit 140.
  • the message transmission / reception unit 131 performs the following processing. That is, the message transmitting / receiving unit 131 updates the communication terminal information 141 based on the content of the newly received control message, and ends the process of step A1.
  • the content distribution control unit 130 takes the union of the content described in the content list 141C of the communication terminal information 141 and the content held by the own communication terminal 100. That is, the content distribution control unit 130 creates a list of contents included in one or both of them.
  • the input / output unit 110 displays a list of these content identifiers (content names), for example, as shown in FIG.
  • the input / output unit 110 may display not only the content name but also which communication terminal 100 has content data constituting the content, and what range of data the communication terminal 100 has. .
  • the user selects content to view from the list of content names displayed on the input / output unit 110 in the communication terminal 100.
  • the input / output unit 110 requests the playback processing unit 120 to play the content.
  • the reproduction processing unit 120 performs reproduction processing while reading out the content data constituting the content from the storage unit 140, and displays it on the input / output unit 110.
  • the content reproduction processing in the reproduction processing unit 120 is reproduction processing using video data compression technology such as MPEG, and is performed using existing technology, and thus detailed description thereof is omitted.
  • FIG. 7 is a flowchart showing processing in which the communication terminal 100 according to the first embodiment of the present invention receives content data.
  • Step B1 The input / output unit 110 requests the content distribution control unit 130 for content specified by the user using the input / output unit 110.
  • the content distribution control unit 130 instructs the message transmission / reception unit 131 to transmit a control message (referred to as a content request message) for requesting the content.
  • the content request message includes the identifier of the self-communication terminal 100 that is the transmission destination of the content data and the content identifier of the requested content.
  • the message transmission / reception unit 131 refers to the communication terminal information 141 based on the content identifier, and selects one communication terminal 100 as the transmission destination of the content request message from the communication terminals 100 that hold the content data constituting the content.
  • the message transmitting / receiving unit 131 transmits the content request message via the communication unit 150 to the communication terminal 100 selected as the transmission destination.
  • the message transmission / reception unit 131 receives a packet serving as content data from the communication terminal 100 that is the transmission destination of the content request message. If the packet transmission / reception unit 131 does not receive the packet even after the preset time-out period elapses, the message transmission / reception unit 131 determines that the content request message has not reached the destination communication terminal 100 for some reason, and again transmits the content request message. Send.
  • the transmission destination for transmitting the content request message may be the same communication terminal 100 as the transmission destination of the previous content request message, or a new transmission destination may be selected again.
  • the position at which to start viewing in the content may be specified by the time from the top of the content. For example, it is specified that the user wants to view the content from a position 5 minutes after the start of the content.
  • the input / output unit 110 may request the content distribution control unit 130 together with the designated start position (time), and the content distribution control unit 130 may calculate the offset of the data at the start position. Further, the input / output unit 110 may calculate an offset of data at the start position.
  • the message transmitting / receiving unit 131 refers to the communication terminal information 141 and selects the communication terminal 100 that holds data from the offset that is the start position of the content. Then, the message transmitting / receiving unit 131 transmits a content request message to which information related to the offset is added to the communication terminal 100 via the communication unit 150. The above is the process of step B1.
  • Step B2 When the content management unit 132 receives a data packet via the communication unit 150 (“Yes” in step B2), the content management unit 132 performs processing in step B3 described later. When the data packet is not received (“No” in step B2), the content management unit 132 waits until the data packet is received. Although not shown, a time-out period for determining that a data packet does not reach is set in advance. If the next data packet is not received before the time-out period elapses, the content management unit 132 receives more content data because the source communication terminal 100 has moved out of the communicable range or the like. Judge that it is not possible. And the content management part 132 starts a process newly from step B1. This timeout time may be equal to the timeout time of the content request message described in step B1, or may be set as a different value.
  • Step B3 The content management unit 132 stores the received data packet (content data) in the storage unit 140 and transmits it to the reproduction processing unit 120 for reproduction processing.
  • the content management unit 132 newly creates or stores content information 142, and updates the retained data range of the content information 142 of the content.
  • Step B4 The content management unit 132 confirms the presence or absence of data (loss data) that the communication terminal 100 does not have in the data from the start offset of the content to the offset of the newly received data packet.
  • loss data (“Yes” in step B4)
  • the content management unit 132 instructs the retransmission control unit 133 to perform processing for requesting retransmission (retransmission request processing) in step B5.
  • no loss data (“No” in step B4)
  • the content management unit 132 performs the process of step B6.
  • Step B5 The retransmission control unit 133 executes a retransmission request process.
  • the retransmission control unit 133 notifies the content management unit 132 that the process has been completed, and the process proceeds to step B7. Details of this retransmission request processing will be described later.
  • Step B6 The content management unit 132 confirms whether all the data has been received from the beginning to the end of the requested content, and if all the data has been received (“Yes” in step B6), the processing ends. If all the data has not been received (“No” in step B6), the content management unit 132 proceeds to the process of step B7.
  • Step B7 The content management unit 132 refers to the communication terminal information 141 and confirms whether or not the communication terminal 100 that is the transmission source holds the content data to be received next.
  • the content management unit 132 returns to step B2 and waits for reception of a data packet of the next content data.
  • the content management unit 132 returns to step B1, searches for the communication terminal 100 that has the next content data, Continue processing.
  • FIG. 8 is a flowchart illustrating a procedure in which the communication terminal 100 according to the first embodiment of the present invention performs a retransmission request process.
  • Step C1 The retransmission control unit 133 that has received the notification of execution of the retransmission request process from the content management unit 132 starts the retransmission request process.
  • the retransmission control unit 133 extracts a range of lost data from the beginning of the content to the end of the currently received data in the content data being received. This data range may be expressed by an offset (first offset) from the beginning of the content, or for video content, a frame identifier or GOP identifier may be used.
  • the first offset of the loss data is used.
  • the retransmission control unit 133 determines the priority of the retransmission request depending on whether or not the loss data obtained by excluding the data for which the retransmission request has already been transmitted from the extracted range of loss data is in time for the reproduction time. Specifically, the retransmission control unit 133 inquires the reproduction processing unit 120 about the offset (second offset) from the beginning of the content for the content data currently being reproduced. Further, the retransmission control unit 133 estimates the size of content data necessary for reproduction during a preset time Tr from the bit rate of video or audio. The retransmission control unit 133 then obtains an offset (third offset) by adding the approximate size to the second offset obtained from the reproduction processing unit 120.
  • the retransmission control unit 133 determines the priority by comparing the obtained third offset with the first offset of the loss data. That is, the retransmission control unit 133 determines that loss data in a range (first offset) smaller than the data offset (third offset) corresponding to the calculated reproduction time is not in time for the reproduction time, The priority of the data is set low. On the other hand, the retransmission control unit 133 determines that the loss data in a range larger than the data offset corresponding to the calculated reproduction time is in time for the reproduction time, and sets the priority of the data to be high. When the retransmission control unit 133 determines the priority for the loss data, the retransmission control unit 133 proceeds to the process of step C2.
  • FIG. 9 is a diagram illustrating processing in which the communication terminal 100 according to the first embodiment of the present invention determines the priority of a retransmission request.
  • the communication terminal 100 has not received data from the first 0 bytes to 2999 bytes, 4000 bytes to 4999 bytes, and 7000 bytes to 7999 bytes among the content data. Then, it is assumed that the communication terminal 100 has already transmitted a retransmission request for 0 to 2999 bytes of data. At this time, the communication terminal 100 determines the priority of the retransmission request for data of 4000 bytes to 4999 bytes and data of 7000 bytes to 7999 bytes.
  • Step C2 The retransmission control unit 133 calculates the loss rate from the extracted range of loss data.
  • the retransmission control unit 133 ends the process without performing the retransmission request process.
  • the retransmission control unit 133 proceeds to Step C3.
  • the loss rate is calculated by the size of the loss data with respect to the data size from the top offset of the content to the maximum offset of the data received so far.
  • the threshold value a number from 0 to 1 is set.
  • the retransmission control unit 133 may proceed to Step C3 without calculating the loss rate (without performing Step C2).
  • Step C3 The retransmission control unit 133 transmits a retransmission request for the loss data whose priority is determined in step C1. Specifically, the retransmission control unit 133 refers to the communication terminal information 141, selects the communication terminal 100 that holds the loss data, and instructs the message transmission / reception unit 131 to transmit a retransmission request message.
  • the retransmission request message is referred to as a retransmission request message.
  • FIG. 10 is a diagram illustrating an example of a retransmission request message transmitted by the communication terminal 100 according to the first embodiment of the present invention.
  • the retransmission request message includes a request source communication terminal identifier indicating own communication terminal 100 that requests retransmission, and retransmission request content information.
  • the retransmission request content information includes a content identifier of the content, an offset range (data range) of data that is a request for retransmission, and a priority thereof.
  • the retransmission control unit 133 instructs the message transmission / reception unit 131 to transmit a retransmission request message to the communication terminal 100 if there is a communication terminal 100 that holds all the loss data.
  • the communication terminal 100 as the transmission destination at this time may be the communication terminal 100 that is the transmission source of the content data constituting the content, or may be another communication terminal 100.
  • the communication terminal 100 may transmit all the retransmission request messages to a single communication terminal 100, or may be distributed to a plurality of communication terminals 100. You may send it.
  • the communication terminal 100 may be divided into loss data having a low priority and loss data having a high priority, and may be transmitted to different communication terminals 100.
  • the communication terminal 100 may transmit the offset range of loss data having a low priority or a high priority to a different communication terminal 100 by, for example, dividing the offset range into packet payload sizes.
  • the retransmission request message is transmitted in the order of high-priority loss data, except for the case where high-priority loss data and low-priority loss data are transmitted together in the same retransmission request message as described above. Send in order.
  • the retransmission control unit 133 instructs the message transmission / reception unit 131 to transmit retransmission request messages for all target loss data, the retransmission control unit 133 ends the processing.
  • the retransmission control unit 133 stores the time when the message transmitting / receiving unit 131 transmits each retransmission request message. The retransmission control unit 133 determines that the retransmission request has timed out if data does not arrive before a preset time-out RTO (Retransmission Time-Out) value elapses by using a timer or the like. If it is determined that the retransmission request has timed out, the retransmission control unit 133 performs the processing from step C1 again. The above is the process of step B5 in FIG.
  • FIG. 11 is a flowchart showing processing in which the communication terminal 100 according to the first embodiment of the present invention transmits a control message.
  • Step D1 The message transmission / reception unit 131 of the content distribution control unit 130 determines, for example, using a timer or the like whether or not it is a predetermined timing for transmitting a control message that arrives at a predetermined cycle.
  • the message transmission / reception unit 131 determines that it is a predetermined timing (“Yes” in step D1)
  • the message transmission / reception unit 131 transmits a control message in step D2. If the message transmission / reception unit 131 determines that it is not the predetermined timing (“No” in step D1), the message transmission / reception unit 131 ends without doing anything.
  • the message transmission / reception unit 131 may transmit a control message in step D2 as necessary, for example, when new content data is received.
  • Step D2 The message transmission / reception unit 131 reads the content information 142 from the storage unit 140 and creates a content list of content composed of content data held by the communication terminal 100 itself.
  • the message transmission / reception unit 131 generates a control message including the created content list and the identifier of the own communication terminal 100. Then, the message transmission / reception unit 131 transmits the generated control message to the communication terminal 100 via the communication unit 150.
  • FIG. 12 is a flowchart showing processing in which the communication terminal 100 according to the first embodiment of the present invention transmits content data.
  • Step E1 When the content request message is received, the content management unit 132 performs the following processing. That is, the content management unit 132 sequentially transmits data from the offset indicating the transmission start position of content data corresponding to the content identifier specified in the message to the transmission source terminal of the message via the communication unit 150. To do. In addition, when the retransmission request message is received, the content management unit 132 sequentially transmits the loss data with higher priority via the communication unit 150 if the ranges of the loss data with different priorities are designated. Even when a plurality of retransmission request messages are received from different communication terminals 100, the content management unit 132 performs transmission with priority from loss data with a high priority, and subsequently transmits loss data with a low priority. .
  • Loss data with the same priority is transmitted, for example, in the order of arrival of retransmission request messages that request the loss data.
  • a data transmission method based on such a priority there is a method of preparing and using the same number of queues as the priority level (“2” in the present embodiment). Specifically, when the retransmission request message arrives, the content management unit 132 inserts the data range requested by the message into a queue corresponding to the designated priority. Then, the content management unit 132 performs transmission processing in order from the data range in the queue with the highest priority, and when the queue becomes empty, moves the processing target to the queue corresponding to the next highest priority. .
  • the content management unit 132 may transmit the content data and the loss data as data packets while round-robin at a predetermined number of packets or time intervals. Alternatively, the content management unit 132 may prioritize transmission of content data requested by the content request message over the retransmission request message. As described above, various policies can be considered for the transmission method of the content data and the loss data. However, it is only necessary to set a policy in advance and follow the policy. When completing the data transmission, the content management unit 132 ends the process of step E1.
  • the communication terminal 100 performs the following process when there is loss data in the received content data for reproducing (viewing) the stream type content. That is, the communication terminal 100 determines the priority of the retransmission request based on whether or not the retransmission is in time by the time when the loss data is reproduced. Then, the communication terminal 100 requests retransmission to other communication terminals 100 in order from the loss data with the highest priority. Receiving the retransmission request, the communication terminal 100 retransmits with priority given to the retransmission request having a higher priority.
  • the communication terminal 100 that has received a retransmission request can preferentially retransmit lost data with high priority, that is, data in time for reproduction in the receiving communication terminal 100 if it is retransmitted at an early stage. Furthermore, the communication terminal 100 that has received a retransmission request performs retransmission in preparation for replaying (viewing) data later or distributing it to other communication terminals even if the data is not in time for reproduction. As a result, the communication terminal 100 can store the content data supplemented with the loss data, and can satisfactorily control the retransmission process.
  • the communication terminal 100 uses the loss rate in order to determine whether or not to execute the retransmission request process. As a result, the communication terminal 100 does not request retransmission even if loss data exists if the loss rate is equal to or less than a preset threshold value even if it does not receive all the content data that constitutes the content.
  • a threshold value for a stream type content within a range that does not affect viewing
  • retransmission of loss data that does not affect viewing can be stopped. Thereby, network resources are allocated to retransmission processing of other important loss data, and efficient retransmission control can be executed.
  • FIG. 13 is a block diagram illustrating the configuration of a communication terminal 200 according to the second embodiment of the present invention.
  • the communication terminal 200 includes a content distribution control unit 230 and a storage unit 240.
  • Other configurations are the same as those in the communication terminal 100 according to the first embodiment shown in FIG. 2, and thus the same reference numerals as those in FIG.
  • the direction of the arrow in the drawing shows an example, and does not limit the direction of the signal between the blocks.
  • the content distribution control unit 230 of the communication terminal 200 includes a retransmission control unit 233.
  • Other configurations are the same as those in the content distribution control unit 130 of the first embodiment shown in FIG. 2, and thus the same reference numerals as those in FIG.
  • the retransmission control unit 133 calculates a loss rate for data from the first offset of the content to the maximum offset of the data received so far after determining the priority for the loss data. .
  • the retransmission control unit 133 requests retransmission of loss data when the calculated loss rate is larger than a preset threshold value.
  • the retransmission control unit 233 calculates the loss rate in the storage data range set in advance for the content after determining the priority for the loss data. Then, the retransmission control unit 233 requests retransmission of loss data when the calculated loss rate is larger than a preset threshold value.
  • the storage unit 240 of the communication terminal 200 stores content information 242. Since the other configuration is the same as that of the storage unit 140 of the first embodiment shown in FIG. 2, the same reference numerals as those in FIG.
  • the content information 242 stored in the storage unit 240 is preset in addition to the content of the content information 142 in the first embodiment of the present invention for all the content composed of the content data held by the own communication terminal 200. Includes stored data range.
  • FIG. 14 is a diagram illustrating content information 242 in the storage unit 240 according to the second embodiment of the present invention. As shown in FIG. 14, the content information 242 includes a storage data range 242C. The other configuration is the same as the configuration in the content information 142 of the first embodiment shown in FIG. 4, and therefore, the corresponding components are denoted by the same reference numerals as those in FIG. Further, the storage data range 242C has the same format as the retained data range 142B of the content list 141C described above, and thus description thereof is omitted.
  • the communication terminal 200 of the present embodiment is different from the communication terminal 100 according to the first embodiment in the contents of the retransmission request process in step B5 shown in FIG. Since other processes are the same as those of the communication terminal 100 in the first embodiment, description thereof is omitted.
  • FIG. 15 is a flowchart illustrating a procedure in which the communication terminal 200 according to the second embodiment of the present invention performs a retransmission request process.
  • the processing in steps C1 and C3 is the same as the processing shown in FIG.
  • Step C4 The retransmission control unit 233 refers to the content information 242 and acquires the storage data range 242C of the content. Then, the retransmission control unit 233 calculates a loss rate of lost data in the stored data range 242C. When the calculated loss rate is equal to or less than a preset threshold value (“Yes” in step C4), the retransmission control unit 233 does not request retransmission of loss data and ends the process. On the other hand, when the calculated loss rate is larger than the preset threshold (“No” in Step C4), the retransmission control unit 233 proceeds to Step C3 in order to request retransmission of the loss data in the stored data range 242C.
  • the loss rate is calculated by the size of the loss data in the storage data range 242C with respect to the data size of the storage data range of the content. If the threshold is set to 0, it is not necessary to calculate the loss rate, and if there is loss data in the storage data range, the process may proceed to step C3 without performing step C4.
  • the retransmission control unit 233 when the retransmission control unit 233 transmits a retransmission request message through the message transmission / reception unit 131, the retransmission control unit 233 stores the transmission time as in the operation of the first embodiment.
  • the retransmission control unit 233 determines that the retransmission request process has timed out when it is detected that data does not arrive by a preset time-out RTO by using a timer or the like.
  • the retransmission control unit 233 executes the process from step C1 again.
  • the communication terminal 200 performs the retransmission request process until the loss rate for the data in the preset storage data range is equal to or less than the threshold value, not until the loss rate of the entire content is equal to or less than the threshold value. Good.
  • each communication terminal 200 stores a part of the data, so that the plurality of communication terminals 200 can manage the content data in a distributed manner. Therefore, retransmission for lost data outside the storage data range of the own communication terminal 200 can be stopped. Therefore, the network resource used for the retransmission can be allocated to transmission / reception of content data by other communication terminals.
  • FIG. 16 is a block diagram illustrating a configuration of a wireless communication system including communication terminals according to the first and second embodiments of the present invention.
  • communication terminals 100 a to 100 h which are examples of communication terminal 100 or communication terminal 200 communicate with each other via access point 300.
  • the communication terminals 100 and 200 may be connected in a connection form called Wi-Fi Direct (registered trademark) in which one of the communication terminals performs the same function as the access point.
  • Wi-Fi Direct registered trademark
  • each component of the communication terminals 100 and 200 in each embodiment described above may be realized by using a semiconductor processing component including an ASIC (Application Specific Integrated Circuit).
  • these components may be realized by causing a computer system including at least one processor (for example, a microprocessor (MPU (Micro Processing Unit)) or a DSP (Digital Signal Processor)) to execute a program.
  • processor for example, a microprocessor (MPU (Micro Processing Unit)) or a DSP (Digital Signal Processor)
  • MPU Micro Processing Unit
  • DSP Digital Signal Processor
  • Non-transitory computer readable media include various types of recording media.
  • the non-transitory computer readable medium is, for example, one of the following media.
  • -Magnetic recording media eg flexible disk, magnetic tape, hard disk
  • a magneto-optical recording medium for example, a magneto-optical disk
  • CD-ROM Compact Disc Read Only Memory
  • CD-R Compact Disc-Recordable
  • CD-R / W Compact Disc-Rewritable
  • -Semiconductor memory for example, mask ROM, PROM (Programmable ROM), ⁇ EPROM (Erasable PROM), Flash ROM and RAM (Random Access Memory).
  • the program may be provided to the computer by various types of temporary computer readable media.
  • Examples of transitory computer readable media include electrical signals, optical signals and electromagnetic waves.
  • the temporary computer-readable medium can provide the program to the computer via a wired communication path such as an electric wire or an optical fiber, or a wireless communication path.
  • the retransmission control unit 133 determines the priority for the loss data, calculates the loss rate, compares it with a preset threshold value, and the loss rate is greater than the threshold value. If larger, a loss data retransmission request is transmitted to another communication terminal.
  • threshold values are set for loss data with a low priority and loss data with a high priority, and the retransmission control unit 133 requests retransmission after calculating the loss rate and comparing with the corresponding threshold values. Whether or not to do so may be determined.
  • the retransmission control unit 233 calculates the loss rate in the storage data range after determining the priority for the loss data, and the loss rate is determined from a preset threshold value. If it is larger, a loss data retransmission request is transmitted to another communication terminal. However, respective threshold values are set for loss data with low priority and loss data with high priority, and the retransmission control unit 233 calculates the loss rate in the storage data range and compares it with the corresponding threshold value. It may be determined whether to request retransmission.
  • the threshold value is set small for loss data determined to have a high priority.
  • the retransmission control unit 133 and the retransmission control unit 233 set two types of priorities for loss data depending on whether or not the retransmission process is in time for the reproduction time.
  • the retransmission control unit 133 and the retransmission control unit 233 can also set a plurality of priorities, for example, for loss data whose retransmission processing is in time for the reproduction time or loss data whose reproduction time has passed. It is. In this way, the retransmission control unit 133 and the retransmission control unit 233 can perform more efficient retransmission control.
  • each threshold value may be set for each priority loss rate.
  • the communication terminal when the self-communication terminal does not have the content data which comprises the content which wants to view and was selected from the input-output part 110, the communication terminal is the said content among other communication terminals.
  • a content request message is transmitted to the communication terminal holding the data.
  • each communication terminal transmits a content request message to the communication terminal and receives the content data when it recognizes the content that the communication terminal does not have from the control message received from the other communication terminal. May start.
  • FIG. 17 is a block diagram illustrating the configuration of the communication terminal 10 according to the third embodiment of the invention.
  • the communication terminal 10 includes a reproduction processing unit 20, a data transmission / reception unit 30, and a retransmission control unit 31.
  • reproduction processing unit 20 corresponds to the reproduction processing unit 120 shown in FIGS. 2 and 13.
  • the data transmission / reception unit 30 corresponds to the content management unit 132 shown in FIGS.
  • the retransmission control unit 31 corresponds to the message transmission / reception unit 131 illustrated in FIGS. 2 and 13, the retransmission control unit 133 illustrated in FIG. 2, and the retransmission control unit 233 illustrated in FIG. 13.
  • the reproduction processing unit 20 reproduces content data.
  • the data transmitter / receiver 30 transmits the content data received from another terminal to the reproduction processor 20. Furthermore, when a loss occurs in the received content data, the retransmission control unit 31 is instructed to request retransmission.
  • the retransmission control unit 31 Upon receiving an instruction from the data transmission / reception unit 30, the retransmission control unit 31 determines the priority of the retransmission request for requesting retransmission of lost data if there is a possibility that retransmission of lost data will be in time for the scheduled reproduction time of the data. Raise. Then, the retransmission control unit 31 requests retransmission to the other communication terminals 10 that have the loss data in order from the loss data with the higher priority.
  • the present embodiment has an effect that it is possible to satisfactorily control retransmission of lost data when content data is lost in distribution of content data between terminals.
  • loss data having a higher priority with respect to data being received in order to perform playback (viewing) of stream-type content that is, playback at the receiving communication terminal 100 if retransmission is performed early.
  • retransmission is requested with priority given to data in time.
  • retransmission is requested in order from loss data having a high priority, so that data that is not in time for reproduction is also requested in a late order. Therefore, it is possible to acquire content data supplemented with loss data in preparation for later reproduction (viewing) or distribution to another communication terminal. For these reasons, the present embodiment can favorably control retransmission processing.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Communication Control (AREA)

Abstract

La présente invention concerne un terminal de communication ou similaire qui régule parfaitement la retransmission de données perdues lorsqu'une perte s'est produite dans des données de contenu au cours d'une diffusion de données de contenu inter-terminaux. Un terminal de communication comprend : une unité de traitement de reproduction qui reproduit des données de contenu; une unité de transmission/réception de données qui transmet, à l'unité de traitement de reproduction, les données de contenu reçues en provenance d'un autre terminal et qui fournit une instruction pour faire une demande de retransmission lorsqu'une perte de données a eu lieu dans les données de contenu reçues; et une unité de commande de retransmission qui reçoit l'instruction depuis l'unité de transmission/réception de données et qui, si la retransmission des données perdues est éventuellement dans le temps pour un temps programmé au niveau duquel l'unité de traitement de reproduction reproduit les données de contenu, élève alors le niveau de priorité de demande de retransmission pour demander la retransmission des données perdues, et effectue ensuite la demande de retransmission à l'autre terminal, qui a les données perdues, dans l'ordre à partir des données perdues ayant le niveau de priorité le plus élevé.
PCT/JP2015/005277 2014-10-31 2015-10-20 Terminal de communication, système de communication, procédé de communication et support d'informations lisible par ordinateur sur lequel un programme informatique a été mémorisé WO2016067561A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002199019A (ja) * 2000-12-27 2002-07-12 Toshiba Corp 通信制御装置、通信制御方法、及び通信制御プログラムが記録された記録媒体
JP2007116204A (ja) * 2000-07-07 2007-05-10 Matsushita Electric Ind Co Ltd データ送信装置とデータ受信装置及びデータ送受信方法
JP2008048182A (ja) * 2006-08-17 2008-02-28 Sony Corp 通信処理装置、および通信制御方法、並びにコンピュータ・プログラム

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007116204A (ja) * 2000-07-07 2007-05-10 Matsushita Electric Ind Co Ltd データ送信装置とデータ受信装置及びデータ送受信方法
JP2002199019A (ja) * 2000-12-27 2002-07-12 Toshiba Corp 通信制御装置、通信制御方法、及び通信制御プログラムが記録された記録媒体
JP2008048182A (ja) * 2006-08-17 2008-02-28 Sony Corp 通信処理装置、および通信制御方法、並びにコンピュータ・プログラム

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