WO2010009657A1 - Procédé de transmission de flux de données de service - Google Patents

Procédé de transmission de flux de données de service Download PDF

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Publication number
WO2010009657A1
WO2010009657A1 PCT/CN2009/072752 CN2009072752W WO2010009657A1 WO 2010009657 A1 WO2010009657 A1 WO 2010009657A1 CN 2009072752 W CN2009072752 W CN 2009072752W WO 2010009657 A1 WO2010009657 A1 WO 2010009657A1
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WO
WIPO (PCT)
Prior art keywords
unit
data
block
multiplex
multiplexing
Prior art date
Application number
PCT/CN2009/072752
Other languages
English (en)
Chinese (zh)
Inventor
晏祥彪
王标
Original Assignee
中兴通讯股份有限公司
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 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2010009657A1 publication Critical patent/WO2010009657A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/70—Media network packetisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/611—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for multicast or broadcast

Definitions

  • the present invention relates to the field of mobile multimedia broadcast technologies, and in particular, to a method for transmitting a mobile multimedia broadcast service data stream.
  • Mobile multimedia broadcasting is a multimedia playback technology that has emerged in recent years. With a handheld terminal, you can watch multimedia services such as TV at high speed.
  • the terminal receives the multimedia service program list through the wireless broadcast channel, and can select the channel that the user has the right to watch, and receive the multimedia data of the selected channel, so as to realize watching TV on the mobile terminal.
  • the multiplexed frame structure is the second part of the mobile multimedia broadcast series standard, which includes multiplexed frame headers composed of payload, length information, and media parameters.
  • the multiplex frame defines the encapsulation format of the data stream, one multiplex frame is composed of a plurality of multiplex subframes, and the number of multiplex subframes is included in the multiplex frame header.
  • the content of a multimedia broadcast service is encapsulated in each multiplex subframe, and its structure is as shown in FIG. 1.
  • the multiplex subframe includes a multiplex subframe header, a video segment, an audio segment, and a data segment.
  • the video segment is encapsulated by multiple video units;
  • the audio segment is encapsulated by multiple audio units;
  • the data segment is encapsulated by multiple data units. to make.
  • the video unit, audio unit and data unit are the smallest units in the existing data stream encapsulation method.
  • the data of all the units of the video segment/audio segment/data segment needs to be discarded, that is, only The unit of the erroneous part is discarded, resulting in error diffusion, which greatly affects the transmission efficiency and fault tolerance of the multimedia broadcast system.
  • the technical problem to be solved by the present invention is to provide a data stream of a mobile multimedia broadcast service.
  • the present invention provides a method for transmitting a service data stream, including: using video, audio or data of a mobile multimedia broadcast service as a payload of a multiplexing block, and basicizing the multiplexing block
  • the description information is encapsulated in a header of the multiplexing block, the basic description information includes a type of the multiplexing block, and the type is used to identify that the payload of the multiplexing block is video, audio or data;
  • the multiplexing block formed by the part is encapsulated as a payload in a corresponding video unit, an audio unit or a data unit; the video unit, the audio unit or the data unit is encapsulated in a multiplex subframe according to a mobile multimedia broadcast multiplexing standard, and then
  • the multiplexed subframes are grouped into multiplexed frames, and the multiplexed frames are transmitted through a mobile multimedia broadcast network.
  • the type of the multiplex block indicates that the service data carried in the payload of the multiplex block is data
  • the content of the data unit type is the same as the data unit type in the data segment header of the multiplex subframe.
  • two or more multiplex blocks are used to carry the mobile multimedia broadcast service.
  • a video unit, an audio unit, or a data unit setting a start flag in a first multiplex block carrying the video unit, audio unit, or data unit, and setting a last multiplex block in the video unit, audio unit, or data unit End tag.
  • the header of the multiplexing block further includes one or more of the following information: a start code, which is used to identify a starting position of the multiplexing block; a payload length of the multiplexing block; and fault tolerant information , which includes verification information of the header of the multiplexing block.
  • the present invention provides a method for transmitting a service data stream in a mobile multimedia broadcast network, in which a video unit, an audio unit or a data unit of a mobile multimedia broadcast multiplex frame is encapsulated by one or more multiplex blocks, and A multiplexing block type is used to distinguish a multiplexing block of a video unit, a multiplexing block of a audio unit, and a multiplexing block of a data unit, wherein a multiplexing unit for a data unit can utilize a data unit type to distinguish data sources and categories;
  • the multiplex block also uses the start code as the isolation to implement error isolation; by multiplexing the block mark, multiple multiplex blocks are used to transmit one multimedia service data; and the method of the present invention ensures that the mobile multimedia broadcast system has transmission High efficiency and good fault tolerance.
  • the head overhead of the multiplex block structure in the method is relatively small, and the performance of the multimedia broadcast transmission is guaranteed.
  • 1 is a schematic structural diagram of a multiplex subframe
  • 2a is a schematic structural diagram of a video segment
  • Figure 2b is a schematic structural view of an audio segment
  • Figure 2c is a schematic structural diagram of a data segment
  • FIG. 3 is a flowchart of data stream transmission in the embodiment
  • FIG. 4 is a schematic structural diagram of a multiplexing block in the embodiment. Preferred embodiment of the invention
  • the main idea of the present invention is: using one or more multiplex blocks to carry service data of a mobile multimedia broadcast system, adding some basic information of the multiplex block in the multiplex block header, including a multiplex block type, which is used Differentiating between a video multiplexing block, an audio multiplexing block, and a data multiplexing block; packaging the multiplexing block as a payload in a video unit and an audio unit of a mobile multimedia broadcast standard multiplexing frame according to a multiplexing block type, and then using the video unit The audio unit and the data unit are respectively encapsulated in the multiplex subframe, and finally the multiple multiplex subframes are formed into a mobile multimedia broadcast standard multiplex frame, and transmitted through the mobile multimedia broadcast network.
  • a multiplex block type which is used Differentiating between a video multiplexing block, an audio multiplexing block, and a data multiplexing block
  • packaging the multiplexing block as a payload in a video unit and an audio unit of a mobile multimedia broadcast standard multiplexing frame according to
  • Each multiplex block header also contains a start code, a start tag, an end tag, a payload length, and error correction fault tolerance information (e.g., a redundancy check word CRC).
  • error correction fault tolerance information e.g., a redundancy check word CRC.
  • the method for transmitting the mobile multimedia service data stream is as shown in FIG. 3, which includes the following steps.
  • Step 310 The service data of the mobile multimedia broadcast is carried by using one or more multiplexing blocks, where the service data of the mobile multimedia broadcast is divided into a video service, an audio service, and a data service according to a media attribute, and the video service includes a television image, Movie images, animations, etc.; audio services include television audio, sound broadcasting, music, voice, etc.; data services include file downloading, data transmission, traffic information, stock data, etc.
  • the multiplex block consists of a header and a payload, carrying mobile multimedia Broadcast service data (video, audio or data) as the payload of the multiplex block, which will serve as the multiplex block payload
  • the basic description information of the service data is encapsulated in a multiplex block header, and the basic description information includes a type of the multiplex block, where the type is used to identify that the payload of the multiplex block belongs to a video service and an audio service of the mobile multimedia broadcast. Or data services.
  • the multiplex block type is used to indicate that the multiplex block is a multiplex block that carries a multimedia broadcast video service, a multiplex block that carries an audio service, or a multiplex block that carries a data service;
  • the header further includes a data unit type,
  • the multiplex block for carrying data is used, that is, when the multiplex block is a multiplex block carrying data, the data unit type is used to indicate the type of data.
  • the definition of the data unit type is the same as the data unit type in the data section header of the multiplexed subframe.
  • the multiplex block header structure includes start code, start tag, end tag, payload length, and CRC fault tolerance in addition to the type and data unit type.
  • the multiplex block header may further include a start code, a start tag, an end tag, a payload length, and a CRC error correction, where the start code is used to identify the start of the multiplex block, and the start tag is used to describe the first complex With the block, the end tag is used to describe the last multiplex block, the payload length refers to the length of the multiplex block payload, and the CRC error correction is the parity information of the multiplex block header.
  • a multiplex block is used to carry the service data unit of the mobile multimedia broadcast, and in the complex Setting a start tag and an end tag simultaneously with a block; when the length of the service data unit of the mobile multimedia broadcast is greater than the payload length of the multiplex block, the service data unit of the mobile multimedia broadcast is carried by using two or more multiplex blocks , the start tag is set in the first multiplex block, and the end tag is set in the last multiplex block.
  • Step 320 Encapsulate the one or more multiplexing blocks in the corresponding video unit, audio unit or data unit according to the definition of the video unit, the audio unit and the data unit according to the mobile multimedia broadcast multiplexing standard.
  • Step 330 The video unit, the audio unit, or the data unit is encapsulated in a video segment, an audio segment, and a data segment according to a mobile multimedia broadcast standard multiplexing frame structure, where the video segment, the audio segment, and the data segment form a multiplexing subframe. Finally, a plurality of multiplexed sub-frames are combined into a multiplexed frame, and data is transmitted through a mobile multimedia broadcast network.
  • FIG. 4 is a schematic structural diagram of a multiplexing block used in a method for transmitting a service data stream in the embodiment, which includes a header and a payload, wherein the header includes a start code, a start tag, an end tag, and Type, payload length, data unit type, and redundancy check word, and where:
  • the start code is used to identify the starting position of the multiplex block, and is the first part of the multiplex block header, which The first byte of the multiplex block can be occupied.
  • the start code occupies 8 bits (1 byte) and takes a fixed value of 0X55.
  • the start code is also the boundary of the multiplex block in the video unit, the audio unit, and the data unit, in addition to being the start of the multiplex block, for locating and dividing the multiplex block.
  • the terminal when extracting the multiplex block in the video unit, the audio unit and the data unit, the terminal can implement the integrity of the multiplex block by checking the start code and the length;
  • the start tag and the end tag are respectively used to identify whether the current multiplex block is the beginning or the end of a video unit, an audio unit or a data unit, and the start tag is transmitted when the video unit, audio unit or data unit is divided into multiple multiplex blocks. Used to describe the first multiplex block, and the end tag is used to describe the last multiplex block;
  • the payload length is used to identify the payload length of the multiplex block, and its unit is byte;
  • a type refers to a multiplex block type, which is used to indicate the type of service data carried by the multiplex block, that is, whether the multiplex block carries video, audio, or data, as shown in Table 1.
  • the multiplex block carrying the video constitutes a video unit
  • the multiplex block carrying the audio constitutes an audio unit
  • the multiplex block carrying the data constitutes a data unit;
  • the data unit type is used when the multiplex block carries data, and is used to indicate the type of data, see table
  • Redundancy check word CRC is the redundancy check word of the multiplex block header
  • the payload refers to the payload of the multiplex block, that is, the service data carried in the multiplex block.
  • the payload of the multiplexing block in this embodiment may be audio, video or data.
  • the overhead of designing the multiplex block header structure includes a start code of 8 bits (bit), a start mark and an end mark of 2 bits, a type 2 bit, a length information of 12 bits, and a data unit type of 8 bits. And CRC8 bits.
  • each field has a variable bit size, but a maximum of 40 bits, which has higher encapsulation and transmission efficiency than the 96-bit overhead of the multi-protocol encapsulation in the European Digital Television DVB standard.
  • the terminal parses the video unit, the audio unit, or the data unit, errors generated by any of the multiplexing blocks do not affect other multiplexing blocks, that is, error isolation is implemented; multiplexing frames for mobile multimedia broadcasting Structure design, the multiplex block type specifically proposed in this embodiment ensures that the mobile multimedia broadcast system has the characteristics of high transmission efficiency and good fault tolerance.
  • the method of the present invention is not limited by the type of the transmission protocol, and is applicable to various protocols such as a real-time streaming protocol, a file transfer protocol, and a multiplexed transport protocol, so that the influence of the protocol is not considered in the multiplex block header.
  • the method for transmitting a mobile multimedia broadcast service data stream provided by the present invention can ensure that the mobile multimedia broadcast system has the characteristics of high transmission efficiency and good fault tolerance.
  • the head overhead of the multiplex block structure in the method is relatively small, and the performance of the multimedia broadcast transmission is guaranteed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

L’invention concerne un procédé de transmission de flux de données de service, qui comprend les étapes consistant à : prendre des fichiers vidéo, audio ou des données d’un service de diffusion multimédia mobile comme charge utile d’un bloc de multiplexage; encapsuler les informations de description de base du bloc de multiplexage dans l’en-tête du bloc de multiplexage, les informations de description de base comprenant le type du bloc de multiplexage et le type servant à déterminer si la charge utile du bloc de multiplexage se compose de fichiers vidéo, audio ou de données; encapsuler le bloc de multiplexage comprenant la charge utile et l’en-tête en tant que charge utile dans une unité vidéo correspondante, une unité audio correspondante ou une unité de données correspondante; et encapsuler l’unité vidéo, l’unité audio ou l’unité de données dans une sous-trame de multiplexage conformément aux normes sur le multiplexage de diffusion multimédia mobile; puis combiner ensuite les sous-trames de multiplexage en une trame de multiplexage et transmettre la trame de multiplexage via un réseau de diffusion multimédia mobile. Le procédé permet d’améliorer l’efficacité de transmission et la tolérance aux pannes d’un système de diffusion multimédia mobile.
PCT/CN2009/072752 2008-07-25 2009-07-14 Procédé de transmission de flux de données de service WO2010009657A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200810144511.5 2008-07-25
CN200810144511.5A CN101330398B (zh) 2008-07-25 2008-07-25 一种业务数据流的发送方法

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CN101330398B (zh) * 2008-07-25 2010-06-16 中兴通讯股份有限公司 一种业务数据流的发送方法
CN101567740B (zh) * 2009-05-27 2013-08-07 中兴通讯股份有限公司 一种多媒体广播业务的传输方法和装置及接收终端
CN101938659A (zh) * 2009-06-30 2011-01-05 中兴通讯股份有限公司 移动多媒体广播系统中业务扩展方法与装置

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CN101330398A (zh) 2008-12-24

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