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WO2014014305A1 - Procédé et appareil pour réaliser sélectivement un classement d'erreurs de paquet de flux de paquets multiples multiplexés sur le même port - Google Patents

Procédé et appareil pour réaliser sélectivement un classement d'erreurs de paquet de flux de paquets multiples multiplexés sur le même port Download PDF

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Publication number
WO2014014305A1
WO2014014305A1 PCT/KR2013/006479 KR2013006479W WO2014014305A1 WO 2014014305 A1 WO2014014305 A1 WO 2014014305A1 KR 2013006479 W KR2013006479 W KR 2013006479W WO 2014014305 A1 WO2014014305 A1 WO 2014014305A1
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WO
WIPO (PCT)
Prior art keywords
packet
sequence number
mmt
substream
mmt packet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2013/006479
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English (en)
Korean (ko)
Inventor
배성준
이현우
류원
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electronics and Telecommunications Research Institute ETRI
Original Assignee
Electronics and Telecommunications Research Institute ETRI
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electronics and Telecommunications Research Institute ETRI filed Critical Electronics and Telecommunications Research Institute ETRI
Priority to US14/415,437 priority Critical patent/US20150131455A1/en
Priority claimed from KR1020130085042A external-priority patent/KR102093408B1/ko
Publication of WO2014014305A1 publication Critical patent/WO2014014305A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/007—Unequal error protection
    • 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
    • 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1835—Buffer management
    • H04L1/1838—Buffer management for semi-reliable protocols, e.g. for less sensitive applications such as streaming video
    • 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements
    • 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
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H04L1/201—Frame classification, e.g. bad, good or erased
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling

Definitions

  • the present invention relates to a method and apparatus for performing packet error classification of multiple packet streams, and more particularly, to a method and apparatus for selectively performing packet error classification of multiple packet streams multiplexed on the same port.
  • MPEG-2 TS multimedia transmission environment
  • the MPEG-2 TS standard was developed in consideration of transmitting multimedia data through an ATM network at the time of enactment, but it is hard to find a case which is used for this purpose today.
  • MPEG MMT MPEG Media Transport
  • An object of the present invention is to provide a method and apparatus for selectively performing packet error classification of multiple packet streams multiplexed on the same port.
  • Another technical problem of the present invention is to provide information regarding which substream a lost packet belongs to when a packet loss occurs.
  • Another technical problem of the present invention is to provide a method and apparatus for selectively distinguishing multiplexed multiple packet streams.
  • Another technical problem of the present invention is to efficiently separate multiplexed multiple packet streams so that an individual error control policy can be taken.
  • an apparatus for generating MPEG Media Transport (MMT) packets includes an encapsulation unit for generating an MPU by encapsulating an AU provided from a media codec layer, and a packetizing unit for generating an MMT packet by packetizing the generated MPU, wherein the packetization unit includes a substream sequence number. And generating the MMT packet having a packet header including a.
  • MMT MPEG Media Transport
  • an MMT packet generation method by an MMT packet generation apparatus includes generating an MPU by encapsulating an AU provided from a media codec layer, and generating an MMT packet by packetizing the generated MPU, wherein the MMT packet includes a substream sequence number. It is characterized by having a packet header.
  • a header structure of an MMT packet in a system for generating an MMT packet, a header structure of an MMT packet is provided.
  • the header structure of the MMT packet basically includes a substream ID field and a substream sequence number field, and further includes a general sequence number flag field indicating whether a general sequence number field exists.
  • a plurality of substreams are multiplexed and transmitted to one port, and even when a packet loss occurs, it is possible to determine which substream the lost packet belongs to. Also, based on this, different ARQs and error control policies may be taken for each subframe.
  • FIG. 1 is a conceptual diagram illustrating an MMT hierarchical structure.
  • FIG. 2 is a flowchart illustrating a process of generating an MMT packet according to an embodiment of the present invention.
  • 3 to 4 illustrate the concept of the substream_seqno field and the generic_seqno field and the usage examples of the substream_seqno field described above.
  • FIG. 5 is a block diagram illustrating an apparatus for generating an MMT packet according to the present invention.
  • FIG. 1 is a conceptual diagram illustrating an MMT hierarchical structure.
  • the MPEG Media Transport (MMT) layer includes an encapsulation layer, a delivery layer, and a signaling layer.
  • the encapsulation layer is a layer for packaging media data in a form that is friendly to both the transmission application in the IP network and the application for file storage. As shown in FIG. 1, the encapsulation layer includes an MMT E.1 layer, an MMT E.2 layer, and an MMT E.3 layer. Can be configured.
  • the MMT E.3 layer encapsulates an Access Unit (AU) provided from the Media Codec (A) layer to create a Media Processing Unit (MPU).
  • the AU is the smallest unit of media data entity and may have timing information as an attribute.
  • the timing information may include a composition time stamp (CTS), a decoding time stamp (DTS), and the like, as information related to time among pieces of information required to consume each media data.
  • CTS composition time stamp
  • DTS decoding time stamp
  • composition time stamp refers to the time when the corresponding access unit is displayed on the screen
  • decoding time stamp refers to the time spent by the corresponding access unit in the decoder.
  • One MPU may include one or more AUs.
  • the MMT E.2 layer encapsulates the MPU generated in the MMT E.3 layer to generate an MMT asset.
  • the MMT asset is a data entity consisting of one or more MPUs, multiplexed by the MMT payload format and transmitted by the MMT protocol.
  • the MMT payload format is a format for payload of an MMT package or MMT signaling message to be delivered by the MMT protocol or an Internet Application Layer protocol (eg, RTP).
  • the MMT asset may correspond to a packetized elementary stream (PES) of MPEG-2 TS, and may include, for example, video, audio, program information, MPEG-U widgets, JPEG images, and MPEG 4 file formats. File Format), M2TS (MPEG Transport Stream), etc.
  • the MMT E.1 layer generates an MMT package by encapsulating the MMT asset generated in the MMT E.2 layer.
  • the MMT package may be composed of one or a plurality of MMT assets together with additional information such as composition information and transport characteristics.
  • the composition information may include information about a relationship between MMT assets, and may further include information for indicating a relationship between a plurality of MMT packages when one content includes a plurality of MMT packages.
  • the transport characteristics may include transmission characteristic information necessary for determining a delivery condition of an MMT asset or an MMT packet, and may include, for example, a traffic description parameter and a QoS descriptor. ) May be included.
  • the MMT package may correspond to a program of MPEG-2 TS.
  • the transport layer (D-layer) is composed of MMT D.1 Layer (MMT D.1 Layer), MMT D.2 Layer (MMT D.2 Layer) and MMT D.3 Layer (MMT D.3 Layer) Can be.
  • the MMT D.1 layer receives the MMT package generated in the MMT E.1 layer and generates an MMT Payload format.
  • the MMT payload format is a payload format for transmitting MMT assets and for transmitting information for consumption by the MMT application protocol or other existing application transmission protocol such as RTP.
  • the MMT D.2 layer receives an MMT payload format generated in the MMT D.1 layer and generates an MMT transport packet or an MMT packet.
  • the MMT transport packet or MMT packet is a data format used in an application transport protocol for MMT.
  • the MMT D.3 layer (D.3-layer) supports the Quality of Service (QoS) by providing the function of exchanging information between layers by a cross-layer design.
  • QoS Quality of Service
  • the D.3 layer may perform QoS control using QoS parameters of the MAC / PHY layer.
  • the signaling layer performs a signaling function (signaling function).
  • the signaling layer may include session initialization / control / management, server-based and / or client-based trick modes, service discovery, synchronization, and the like of transmitted media. It can perform a signaling function for.
  • the signaling layer may include an MMT S.1 layer and an MMT S.2 layer.
  • the MMT S.1 layer interfaces with service discovery, media session initialization / termination of media, media session presentation / control of media, delivery layer and encapsulation layer. And the like.
  • the MMT S.2 layer relates to flow control, delivery session management, delivery session monitoring, error control, and hybrid network synchronization control. It is possible to define the format of the control message exchanged between delivery end-points of the delivery layer.
  • the MMT S.2 layer may provide signaling required between a sender and a receiver to support the operation of the transport layer.
  • the S.2 layer may be responsible for interfacing with the transport layer and the encapsulation layer.
  • FIG. 2 is a flowchart illustrating a process of generating an MMT packet according to an embodiment of the present invention.
  • the MMT packet generating apparatus generates the MMT packet according to the above-described definition of the MMT layer.
  • the MMT packet generating apparatus according to the present invention generates the MPU by encapsulating the AU provided from the media codec layer (S200), and generates the MMT packet by packetizing the generated MPU (S210).
  • the MMT packet generating apparatus selectively uses the sequence number in order to selectively perform packet error classification of multiple packet streams multiplexed on the same port.
  • the MMT packet generating apparatus can selectively perform packet error classification of multiple packet streams multiplexed on the same port based on at least one of a substream sequence number and a general sequence number. Create
  • the MMT packet generating apparatus may generate an MMT packet including various kinds of sequence numbers.
  • the selective use of the sequence number used by the MMT packet generating apparatus according to the present invention includes 1) using both the substream sequence number and the general sequence number by default, 2) the selective use of the substream sequence number, and the general sequence. Basic use of numbers, 3) basic use of substream sequence numbers, optional use of generic sequence numbers, or 4) use of only substream sequence numbers.
  • the MMT packet generation device may determine the sequence mode. In other words, the MMT packet generating apparatus may determine any one of the methods 1) to 4) as the sequence mode.
  • Table 1 shows an MMT packet header structure according to an embodiment of the present invention.
  • Table 1 shows a case in which both a substream sequence number and a general sequence number are basically used.
  • packet reordering and packet error processing are performed in units of multiplexed entire streams. Can be used if you need to always check if you belong.
  • a header field of an MMT packet may include a generic_seqno field, a substream_ID field, and a substream_seqno field.
  • the generic_seqno field is a generic sequence number that is incremented by 1 for each packet in the order in which the packets are sent for the packet stream sent to the same port.
  • the generic_seqno field may be called a packet_counter field. Same as below.
  • the substream_ID field is an identifier for distinguishing these individual streams from each other when multiplexing (sub) streams having different characteristics into one packet string.
  • the substream_ID field may be called a packet_id field. Same as below.
  • the substream_seqno field indicates a subframe sequence number that increases by 1 for every packet for a packet stream having the same substream_ID.
  • an operation based on a packet sequence number such as error checking and error recovery, may be performed in units of substreams. That is, error control may be performed in units of subframes using the substream_seqno field included in the header field of the MMT packet received by the MMT packet receiver.
  • the substream_seqno field may be called a packet_sequence_number field. Same as below.
  • Table 2 shows an MMT packet header structure according to another embodiment of the present invention.
  • Table 2 shows a case in which a substream sequence number is selectively used and a general sequence number is basically used.
  • the substream sequence number is optionally used and the general sequence number is used by default. For example, packet order reordering and packet error processing are performed in units of multiplexed entire streams, but lost packets belong to any substream. It can be used to check whether or not to selectively perform according to the application.
  • the header field of the MMT packet may include a generic_seqno field, a substream_ID field, a flag_substream_seqno field, and a substream_seqno field.
  • the generic_seqno field is a generic sequence number that is incremented by 1 for each packet in the order in which the packets are sent for the packet stream sent to the same port.
  • the substream_ID field is an identifier for distinguishing these individual streams from each other when multiplexing (sub) streams having different characteristics into one packet string.
  • the flag_substream_seqno field indicates whether the substream_seqno field exists in the header field. For example, when the flag_substream_seqno field has a value of 1, it may represent that the substream_seqno field exists in the header field.
  • the flag_substream_seqno field may be called a packet_sequence_number_flag field. Same as below.
  • the substream_seqno field indicates a subframe sequence number that increases by 1 for every packet for a packet stream having the same substream_ID.
  • an operation based on a packet sequence number such as error checking and error recovery, may be performed in units of substreams.
  • Table 3 shows an MMT packet header structure according to another embodiment of the present invention.
  • Table 3 shows a case in which the substream sequence number is basically used and the general sequence number is selectively used.
  • the substream sequence number is basically used, and the general sequence number is selectively used.
  • the packet error processing function or the reordering function is performed in the substream unit at the receiving side. Can only be used when using the full sequence number.
  • a header field of an MMT packet may include a substream_seqno field, a substream_ID field, a flag_generic_seqno field, and a generic_seqno field.
  • the substream_ID field is an identifier for distinguishing these individual streams from each other when multiplexing (sub) streams having different characteristics into one packet string.
  • the substream_seqno field indicates a subframe sequence number that increases by 1 for every packet for a packet stream having the same substream_ID.
  • an operation based on a packet sequence number such as error checking and error recovery, may be performed in units of substreams.
  • the flag_generic_seqno field indicates whether the generic_seqno field exists in the header field. For example, if the flag_generic_seqno field has a value of 1, this may indicate that the generic_seqno field exists in the header field.
  • the flag_generic_seqno field may be called a packet_counter_flag field. Same as below.
  • the generic_seqno field is a generic sequence number that is incremented by 1 for each packet in the order in which the packets are sent for the packet stream sent to the same port.
  • Table 4 shows an MMT packet header structure according to another embodiment of the present invention.
  • Table 4 shows a case where only the substream sequence number is used.
  • the method of using only the service trim sequence number is, for example, a substream is demultiplexed at the receiving side, and basically, whether a lost packet is found for each substream, and at the same time, a single substream without multiplexing This is the case where the function of the existing general sequence number can be replaced by the substream sequence number.
  • the header field of the MMT packet may include a substream_ID field and a substream_seqno field.
  • the substream_ID field is an identifier for distinguishing these individual streams from each other when multiplexing (sub) streams having different characteristics into one packet string.
  • the substream_seqno field indicates a subframe sequence number that increases by 1 for every packet for a packet stream having the same substream_ID.
  • an operation based on a packet sequence number such as error checking and error recovery, may be performed in units of substreams.
  • 3 to 4 illustrate the concept of the substream_seqno field and the generic_seqno field and the usage examples of the substream_seqno field described above.
  • the MMT packet generating apparatus 500 may include an encapsulation unit 510, a packetization unit 520, and a determination unit 530.
  • the encapsulator 510 generates an MPU by encapsulating the AU, and the packetizer 520 generates an MMT packet by packetizing the generated MPU.
  • the packetizer 520 may generate an MMT asset based on the MPU, and generate an MMT packet based on the MMT asset.
  • the generated MMT packet may include the packet header structure of any one of Tables 1 to 4 described above.
  • the MMT packet generated by the packetizer 520 may then be transmitted from the transmitter to the receiver through the network.
  • each stream for a plurality of MMT packets may be multiplexed and transmitted to one port.
  • a substream may be substreamed based on a substream sequence number and / or a general sequence number included in a header of each MMT packet. Different ARQ policies or error control policies can be taken.
  • the determiner 530 may determine whether to generate an MMT packet based on at least one of a substream sequence number and a general sequence number. In addition, the determination unit 530 may determine whether the substream sequence number or the general sequence number is basically included in the MMT packet or optionally.
  • Determining unit 530 is 1) using both the substream sequence number and the general sequence number by default, 2) optional use of the substream sequence number, the basic use of the general sequence number, 3) the basic use of the substream sequence number, Optional use of a generic sequence number, or 4) only the substream sequence number can be used to determine whether to construct a header.
  • the determination unit 510 may determine any one of 1) to 4) in consideration of a time delay or a sensitivity regarding data loss.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Multimedia (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
PCT/KR2013/006479 2012-07-19 2013-07-19 Procédé et appareil pour réaliser sélectivement un classement d'erreurs de paquet de flux de paquets multiples multiplexés sur le même port Ceased WO2014014305A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/415,437 US20150131455A1 (en) 2012-07-19 2013-07-19 Method and apparatus for selectively performing packet error classification of multiple packet streams multiplexed to same port

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2012-0078772 2012-07-19
KR20120078772 2012-07-19
KR10-2013-0085042 2013-07-19
KR1020130085042A KR102093408B1 (ko) 2012-07-19 2013-07-19 동일 포트에 멀티플렉싱 된 다중 패킷 스트림의 패킷오류 구분을 선택적으로 수행하는 방법 및 그 장치

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WO2017007281A1 (fr) * 2015-07-08 2017-01-12 엘지전자(주) Dispositif et procédé d'émission et de réception d'un signal de diffusion
CN110719244A (zh) * 2018-07-11 2020-01-21 上海交通大学 异构网络下媒体的传输方法及系统

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Publication number Priority date Publication date Assignee Title
WO2017007281A1 (fr) * 2015-07-08 2017-01-12 엘지전자(주) Dispositif et procédé d'émission et de réception d'un signal de diffusion
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CN110719244A (zh) * 2018-07-11 2020-01-21 上海交通大学 异构网络下媒体的传输方法及系统
CN110719244B (zh) * 2018-07-11 2021-08-20 上海交通大学 异构网络下媒体的传输方法及系统

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