WO2010108416A1 - Procédé, dispositif et système de communication pour la transmission de messages de données en codage vidéo évolutif - Google Patents

Procédé, dispositif et système de communication pour la transmission de messages de données en codage vidéo évolutif Download PDF

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Publication number
WO2010108416A1
WO2010108416A1 PCT/CN2010/071086 CN2010071086W WO2010108416A1 WO 2010108416 A1 WO2010108416 A1 WO 2010108416A1 CN 2010071086 W CN2010071086 W CN 2010071086W WO 2010108416 A1 WO2010108416 A1 WO 2010108416A1
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WO
WIPO (PCT)
Prior art keywords
sequence number
data packet
real
updated
network device
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Application number
PCT/CN2010/071086
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English (en)
Chinese (zh)
Inventor
徐相胜
郑合文
胡寅亮
荀永生
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华为技术有限公司
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Publication of WO2010108416A1 publication Critical patent/WO2010108416A1/fr

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Classifications

    • 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
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0084—Formats for payload data
    • 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
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0093—Point-to-multipoint

Definitions

  • Scalable video coding encodes multiple video layer data into a single bit sequence.
  • TID temporary_id
  • DID spatial scalable field DID
  • QID quality_id
  • the bit stream after encoding is completed by a base layer and a plurality of scalable layers (or called an expandable layer, an enhancement layer).
  • the base layer is compatible with H.264/Advanced Video Coding (AVC: Advanced Video Coding).
  • a terminal that only supports H.264/AVC receives SVC data, it can only recognize the base layer data and cannot identify the scalable layer data.
  • the terminal will decode the base layer and display it on the screen.
  • the terminal decodes the base layer data together with the scalable layer data to produce a better video picture.
  • the goal of applying SVC is to encode the data source once, in different video applications and different terminals (high-resolution TV, general resolution TV, mobile terminal, etc.), the terminal only needs to select the part transmitted via the network or All data can meet its own requirements and can successfully decode the display.
  • IPTV Internet Protocol TV
  • IP Internet Protocol
  • RTP Real Time Transport Protocol
  • Each RTP message has a serial number corresponding to it.
  • RTP Real Time Transport Protocol
  • a basic layer data packet is followed by the corresponding scalable layer data packet, and the network device extracts some or all of the packets when adapting the SVC video data. , forwarded to the receiving terminal.
  • a basic layer data packet has two corresponding scalable layer data packets. If the network device receives six data packets, the sequence numbers are 1, 2, 3, 4, 5, and 6, respectively.
  • And 4 are basic layer data packets
  • 2 and 5 are data packets of the scalable layer 1
  • 3 and 6 are data packets of the scalable layer 2
  • the network device may report the data message 1 And 4, or data messages 1, 2, 4 and 5, or data messages 1, 3, 4 and 6, or data messages 1, 2, 3, 4, 5 and 6 are forwarded to the terminal, visible except the data Messages 1, 2, 3, 4, 5, and 6 are forwarded to the terminal, and the sequence numbers of other various combinations of data packets are not consecutive.
  • the terminal After receiving the data packets with discontinuous sequence numbers, the terminal incorrectly considers that the RTP packet is lost, so as to initiate a retransmission request to the network device. In fact, the data packet that is not forwarded to the terminal is not required by the terminal, and can be called "false packet loss".
  • Embodiments of the present invention provide a method, a device, and a communication system for forwarding a scalable video encoded data message.
  • the technical solution provided by the embodiment of the present invention can enable an RTP encapsulated SVC multicast data packet sent by a network device.
  • the serial number is continuous, and the downstream node is prevented from sending unnecessary retransmission request packets to the network device, thereby reducing the burden on the network device.
  • An embodiment of the present invention provides a method for a network device to forward a scalable video encoded data packet, including: receiving a scalable video encoded multicast data packet encapsulated by a real-time transport protocol;
  • the embodiment of the invention provides a network device, including:
  • a receiving unit configured to receive a scalable video encoded multicast data packet encapsulated by a real-time transport protocol
  • an adapting unit configured to select a data packet suitable for the downstream node from the data packet to form a multicast data stream to be forwarded
  • the sequence number of the real-time transmission protocol of the data packet in the multicast data stream is discontinuous
  • An update unit configured to update a discontinuous real-time transport protocol sequence number of the data packet in the multicast data stream to a continuous real-time transport protocol sequence number
  • a sending unit configured to forward, to the downstream node, a multicast data stream that is updated by a data packet of a continuous real-time transport protocol sequence number.
  • the embodiment of the invention provides a communication system, which includes the network device provided by the embodiment of the invention.
  • the discontinuous RTP sequence number of the data packet in the scalable video encoded multicast data stream can be updated to a continuous sequence number, so that the downstream node is The retransmission request is not sent for the unneeded data packet, which can reduce the resource consumption required by the downstream node, reduce the occupation of network resources, and prevent the network device from processing unnecessary retransmission requests, thereby improving the network. Resource utilization efficiency of equipment.
  • Embodiment 1 is a flow chart of Embodiment 1 of a method for a network device to forward a scalable video encoded data packet according to an embodiment of the present invention
  • Embodiment 2 is a flow chart of Embodiment 2 of a method for a network device to forward a scalable video encoded data packet according to an embodiment of the present invention
  • Embodiment 1 of a network device according to an embodiment of the present invention
  • Embodiment 4 is a structural diagram of Embodiment 2 of a network device according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of data transmission in an embodiment of a communication system according to an embodiment of the present invention.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The technical solutions in the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings. It is apparent that the described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
  • FIG. 1 is a flowchart of an embodiment of a method for forwarding a scalable video encoded data packet by a network device according to an embodiment of the present invention, including:
  • the SVC multicast data packet of the received RTP packet has a continuous RTP sequence number. If the SVC multicast data packet received by the network device does not have a continuous RTP sequence number, the upstream packet loss phenomenon may be requested. Retransmit the lost SVC multicast data packet.
  • the selected data packet suitable for the downstream node may not have a continuous RTP sequence number.
  • the downstream node may be a terminal or pair that decodes and displays the data packet.
  • a network device that forwards data packets.
  • the discontinuous RTP sequence number of the data packet in the multicast data stream to a continuous RTP sequence number; the sequence header of the RTP data packet has a sequence number field, where the field is saved.
  • the RTP sequence number corresponding to the data packet therefore, the RTP sequence number in the sequence number field of the data packet is updated, and the discontinuous RTP sequence number of the data packet in the multicast data stream can be updated to a continuous RTP. serial number.
  • the RTP sequence numbers of the four data messages can be updated to 401, 402, 403, and 404.
  • the updated RTP serial number is continuous. It can be understood that the embodiment of the present invention does not limit the form of consecutive RTP sequence numbers, and only needs to be able to store the sequence number field without affecting the implementation of the embodiment of the present invention.
  • a multicast data stream that is updated by a data packet that is updated to be a continuous RTP sequence number.
  • the multicast data stream consisting of the data packet updated to the continuous RTP sequence number is sent to the downstream node, and the downstream node considers that the sequence number of the data packet in the multicast data stream is continuous, so that the retransmission request is not sent, so Won't A false packet loss occurred.
  • the discontinuous RTP sequence number of the data packet in the multicast data stream can be updated to a continuous RTP sequence number, so that the downstream node does not send a retransmission request for the unnecessary data packet. Reducing the resource consumption required by the downstream node can also reduce the occupation of the network resources, and the network device does not need to process unnecessary retransmission requests, thereby improving the resource utilization efficiency of the network device.
  • the network device saves data packets acquired during a period of time, for example, for SVC video data packets, the network device generally saves the data packets that are lost or faulty during the transmission of the data packets to the downstream node. Play 8 seconds of video data.
  • the forwarding method of the embodiment of the present invention may further include: storing a mapping relationship between the discontinuous RTP sequence number and the continuous RTP sequence number.
  • the number of saved mappings corresponds to the number of saved data packets, that is, the mapping relationship of the serial number of each saved data packet can be saved.
  • mapping relationship can be saved in the sequence number mapping relationship table.
  • a sequence number mapping relationship table provided by the embodiment of the present invention is shown in Table 1.
  • FIG. 2 is a flowchart of a second embodiment of a method for forwarding a scalable video encoded data packet by a network device according to an embodiment of the present invention, including:
  • the checksum is calculated based on the data of the entire data packet. Therefore, if the RTP sequence number of the data packet is updated, the checksum of the data packet needs to be recalculated, so that the checksum corresponds to the data packet, thereby Avoid mistakenly thinking that the data message with the updated RTP serial number is incorrect.
  • 207 Forward, to the downstream node, a multicast data stream that is a data packet that is updated to be a continuous RTP sequence number. It can be understood that 206 and 204, 205, and 206 are not in the order of execution, and only 204 and 206 are required to be executed after 203, and the implementation of the embodiment of the present invention is not affected.
  • the data packet that updates the RTP sequence number to the updated RTP sequence number is sent to the downstream node.
  • the discontinuous RTP sequence number of the data packet in the multicast data stream can be updated to a continuous RTP sequence number, so that the downstream node does not send a retransmission request for the unnecessary data packet. Reducing the resource consumption required by the downstream node can also reduce the occupation of the network resources, and the network device does not need to process unnecessary retransmission requests, thereby improving the resource utilization efficiency of the network device; further, the discontinuous RTP sequence number and Even The mapping of the continued RTP sequence number is saved to ensure that the network device sends the correct data packet to the downstream node during retransmission. Further, the checksum of the data packet is updated to avoid incorrectly updating the RTP sequence number. The data message is incorrect and the retransmission is generated.
  • FIG. 3 is a diagram showing the structure of Embodiment 1 of a network device according to an embodiment of the present invention, including:
  • the receiving unit 301 is configured to receive the scalable video encoded multicast data packet encapsulated by the RTP.
  • the adapting unit 302 is configured to select a data packet suitable for the downstream node from the data packet received by the receiving unit 301 to form a multicast data stream to be forwarded, where the RTP sequence number of the data packet in the multicast data stream is discontinuous;
  • the updating unit 303 is configured to update the discontinuous RTP sequence number of the data packet in the multicast data stream formed by the adapting unit 302 to a continuous RTP sequence number;
  • the sending unit 304 is configured to forward, to the downstream node, a multicast data stream composed of data packets updated by the update unit 303 into consecutive RTP sequence numbers.
  • the embodiment of the network device can update the discontinuous RTP sequence number of the data packet in the multicast data stream to a continuous RTP sequence number, so that the downstream node does not send a retransmission for the unnecessary data packet.
  • the request can reduce the resource consumption required by the downstream node, reduce the occupation of the network resource, and prevent the network device from processing unnecessary retransmission requests, thereby improving the utilization efficiency of the network device resources; and using the network device
  • the existing downstream nodes and data sources need not be modified, and the networking cost can be reduced while ensuring good compatibility; and since the RTP serial number is updated, there is no need to add a new one.
  • the RTP serial number so there is no need to update the existing protocol, and it has better compatibility.
  • the network device may further include:
  • the saving unit is configured to save a mapping relationship between the discontinuous RTP sequence number and the consecutive RTP sequence numbers updated by the updating unit 303.
  • the saving unit is further configured to save the data packet received by the receiving unit.
  • FIG. 4 is a schematic diagram of a structure of a second embodiment of a network device according to an embodiment of the present invention, including:
  • the receiving unit 401 is configured to receive the scalable video encoded multicast data packet encapsulated by the RTP, and receive a retransmission request from the downstream node, where the retransmission request includes the updated RTP sequence number of the data packet that needs to be retransmitted;
  • the adapting unit 402 is configured to select a data packet suitable for the downstream node from the data packet received by the receiving unit 401 to form a multicast data stream to be forwarded, where the RTP sequence number of the data packet in the multicast data stream is discontinuous;
  • the data packet suitable for the downstream node refers to a data message that the downstream node can decode and display.
  • the updating unit 403 is configured to update the discontinuous RTP sequence number of the data message in the multicast data stream formed by the adapting unit 402 to a continuous RTP sequence number; the checksum update calculated by using the calculating unit 404 is updated.
  • the calculating unit 404 is configured to calculate a checksum of the data packet whose RTP sequence number is updated by the updating unit 403, and the checksum of each data packet corresponds to a new RTP sequence number of the data packet;
  • the saving unit 405 is configured to save a mapping relationship between the discontinuous sequence number and the consecutive serial numbers updated by the updating unit 403; and save the data message received by the receiving unit 401;
  • the sending unit 406 is configured to forward, to the downstream node, a multicast data stream that is not updated by the update unit 403 and is updated by the update unit 403 into a continuous RTP sequence number; and the RTP sequence number is updated by the update unit 403 to be updated.
  • the data packet of the RTP sequence number is sent to the downstream node;
  • the searching unit 407 is configured to determine, according to the mapping relationship saved by the saving unit 405, the original real-time transmission protocol sequence number of the data message that needs to be retransmitted in the retransmission request received by the receiving unit 401; and the saved data according to the original real-time transmission protocol sequence number Find the data packet that needs to be retransmitted in the packet.
  • the network device in this embodiment can update the discontinuous RTP sequence number of the data packet in the multicast data stream to a continuous RTP sequence number, so that the downstream node does not send heavy data packets.
  • the request can reduce the resource consumption required by the downstream node, reduce the occupation of network resources, and prevent the network device from processing unnecessary retransmission requests, thereby improving the resource utilization efficiency of the network device; further
  • the mapping between the RTP sequence number and the consecutive RTP sequence numbers is saved to ensure that the network device sends the correct data packet to the downstream node. Further, the checksum of the data packet is updated to avoid incorrectly updating the RTP sequence number.
  • the existing downstream node and the data source need not be modified, and the cloth can be reduced while ensuring good compatibility. Net cost; and because the RTP serial number is updated, there is no need to add a new RTP serial number So do not need to update the existing agreement, has good compatibility.
  • the embodiment of the present invention further provides a communication system, which includes a data source 501, a network device 502 provided by the foregoing embodiment of the present invention, and downstream nodes 503, 504, and 505.
  • Figure 5 is a diagram showing the flow of data packet transmission in the embodiment of the communication system according to the embodiment of the present invention.
  • the data source 501 sends six RTP-encapsulated SVC multicast datagrams to the network device 502 over the IP network.
  • the serial numbers are 1, 2, 3, 4, 5, 6, respectively.
  • Data packets 1 and 4 belong to the base layer
  • data packets 2 and 5 belong to the scalable layer 1
  • data packets 3 and 6 are scalable. Layer two.
  • the network device 502 determines that the downstream node 503 needs a data packet of the base layer, that is, a data packet with sequence numbers 1 and 4.
  • the downstream node 504 needs a data packet of the base layer and the scalable layer 1, that is, the sequence number is 1, 2 Data packets of 4, 5, and 5;
  • the downstream node 505 needs data packets of the base layer and the scalable layer 2, that is, data packets with sequence numbers 1, 3, 4, and 6, and the data packets suitable for the downstream nodes are required.
  • the text refers to that the terminal connected to the downstream node or the downstream node can decode the displayed data packet.
  • the network device 502 updates the discontinuous sequence number of the data packet required by each downstream node to a consecutive sequence number, updates the sequence number of the data packet required by the downstream node 503 to 501 and 502, and sends the sequence number to the downstream node 503.
  • the sequence number of the data message required by the downstream node 504 is updated to 101, 102, 103, and 104, and sent to the downstream node 504;
  • the sequence number of the data message required by the downstream node 505 is updated to 801, 802, 803, and 804, and sent to the downstream node 505; the downstream contacts 503-505 forward or decode the respective received data messages as needed.
  • the network device in this embodiment of the communication system can update the discontinuous sequence number of the data packet in the multicast data stream to a continuous sequence number, so that the downstream node does not send the unnecessary data packet.
  • the retransmission request can reduce the resource consumption required by the downstream node, reduce the occupation of the network resource, and prevent the network device from processing unnecessary retransmission requests, thereby improving resource utilization efficiency of the network device; and using the network device
  • the existing downstream nodes and data sources need not be modified, and the networking cost can be reduced while ensuring better compatibility; and since the serial number is updated, there is no need to increase The new serial number, so there is no need to update the existing protocol, and it has better compatibility.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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

Abstract

La présente invention est liée au domaine de la technologie de communication et concerne un procédé, un dispositif et un système de communication pour la transmission de messages de données en codage vidéo évolutif (scalable video coding, SVC). Le procédé de transmission de messages de données SVC comporte les étapes consistant à : recevoir des messages de données SVC en multidiffusion encapsulés par le protocole de transport en temps réel (real-‌time transport protocol, RTP) ; sélectionner des messages de données convenant pour le nœud aval parmi lesdits messages de données afin de former le flux de données en multidiffusion à transmettre, les numéros de séquence RTP des messages de données n'étant pas continus ; mettre à jour les numéros de séquence RTP discontinus des messages de données dudit flux de données en multidiffusion pour donner des numéros de séquence continus ; transmettre au nœud aval le flux de données en multidiffusion formé par les messages de données dont les numéros de séquence RTP ont été mis à jour de façon à être continus. L'application de la solution technique selon les modes de réalisation de la présente invention rend continus les numéros de séquence des messages de données SVC en multidiffusion encapsulés par RTP et émis par un dispositif de réseau. Cela évite que le nœud aval n'envoie inutilement des messages de demande de réémission au dispositif de réseau, d'où une réduction de la charge du dispositif de réseau.
PCT/CN2010/071086 2009-03-24 2010-03-17 Procédé, dispositif et système de communication pour la transmission de messages de données en codage vidéo évolutif WO2010108416A1 (fr)

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CN200910119372.5 2009-03-24
CN2009101193725A CN101515934B (zh) 2009-03-24 2009-03-24 转发可伸缩视频编码数据报文的方法、设备和通信系统

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Publication number Priority date Publication date Assignee Title
CN101515934B (zh) * 2009-03-24 2012-07-04 华为技术有限公司 转发可伸缩视频编码数据报文的方法、设备和通信系统
CN109842856A (zh) * 2017-11-29 2019-06-04 成都鼎桥通信技术有限公司 一种屏蔽上行丢包的方法和设备
CN112533154B (zh) * 2019-09-19 2022-04-22 成都鼎桥通信技术有限公司 数据处理方法、装置和存储介质
CN113872735B (zh) * 2020-06-30 2023-10-24 京东方科技集团股份有限公司 数据传输方法、装置及设备
CN113038064B (zh) * 2021-05-24 2021-08-20 北京电信易通信息技术股份有限公司 一种移动终端会议系统

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Publication number Priority date Publication date Assignee Title
EP1742476A1 (fr) * 2005-07-06 2007-01-10 Thomson Licensing Système et méthode pour le codage et transmission scalable en temps réel de vidéo
WO2008056878A1 (fr) * 2006-11-09 2008-05-15 Electronics And Telecommunications Research Institute Procédé pour la détermination d'un type de paquet pour flux binaire vidéo svc, et appareil de mise en paquets rtp et son procédé d'utilisation
WO2008088132A1 (fr) * 2007-01-19 2008-07-24 Electronics And Telecommunications Research Institute Dispositif et procédé d'estampillage temporel pour mise en paquets rtp d'une vidéo codée en mode svc
CN101515934A (zh) * 2009-03-24 2009-08-26 华为技术有限公司 转发可伸缩视频编码数据报文的方法、设备和通信系统

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1742476A1 (fr) * 2005-07-06 2007-01-10 Thomson Licensing Système et méthode pour le codage et transmission scalable en temps réel de vidéo
WO2008056878A1 (fr) * 2006-11-09 2008-05-15 Electronics And Telecommunications Research Institute Procédé pour la détermination d'un type de paquet pour flux binaire vidéo svc, et appareil de mise en paquets rtp et son procédé d'utilisation
WO2008088132A1 (fr) * 2007-01-19 2008-07-24 Electronics And Telecommunications Research Institute Dispositif et procédé d'estampillage temporel pour mise en paquets rtp d'une vidéo codée en mode svc
CN101515934A (zh) * 2009-03-24 2009-08-26 华为技术有限公司 转发可伸缩视频编码数据报文的方法、设备和通信系统

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