WO2008119259A1 - Système et procédé de correction d'erreurs sans voie de retour adaptative dynamique dans un réseau iptv - Google Patents

Système et procédé de correction d'erreurs sans voie de retour adaptative dynamique dans un réseau iptv Download PDF

Info

Publication number
WO2008119259A1
WO2008119259A1 PCT/CN2008/000664 CN2008000664W WO2008119259A1 WO 2008119259 A1 WO2008119259 A1 WO 2008119259A1 CN 2008000664 W CN2008000664 W CN 2008000664W WO 2008119259 A1 WO2008119259 A1 WO 2008119259A1
Authority
WO
WIPO (PCT)
Prior art keywords
fec
packet
top box
set top
network
Prior art date
Application number
PCT/CN2008/000664
Other languages
English (en)
Chinese (zh)
Inventor
Junkai Chen
Zhuzhong Xie
Peiwen Pi
Wentao Zeng
Original Assignee
Utstarcom Telecom Co., Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Utstarcom Telecom Co., Ltd filed Critical Utstarcom Telecom Co., Ltd
Publication of WO2008119259A1 publication Critical patent/WO2008119259A1/fr

Links

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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding

Definitions

  • the present invention relates to the field of multimedia communication and IPTV (network television), and more particularly to the field of network transmission and error control of streaming media in the IPTV field. Background technique
  • IP networks have the advantages of wide popularity, good compatibility, and high cost performance. More and more traditional telecommunications and broadcasting services are used as platforms to carry out their business. IPTV is one of the latest technological hotspots of this development.
  • Packet loss in the prior art is usually solved by retransmission.
  • IPTV service due to the high real-time requirements of the IPTV service, especially in the case of live programs, multicast programs, fast forward and rewind modes, and video calls, there are significant limitations to using the retransmission method to solve the packet loss problem.
  • Sex sometimes it is impossible to solve the problem of packet loss at all. _
  • the present invention provides a dynamic adaptation of a set-top box and an IPTV stream server based on a license authentication mechanism and compatible with FEC attributes and no FEC attributes, in view of technical defects in audio frequency loss caused by network packet loss in an iPTV system.
  • the implementation method of FEC feedback control technology is described in detail below.
  • a method for implementing error control on packet loss in an IP network by using dynamic adaptive FEC in an IPTV system includes the following steps:
  • the set top box sends a streaming service request to the streaming server, and carries the FEC authentication authorization flag
  • the streaming server receives the request and returns the result of the request to the set top box
  • the FEC decoder of the set top box counts the number of packet loss based on the FEC packet in the IP network, and generates a statistical result
  • the FEC encoder in the stream server only adjusts the number of FEC data packets sent by the current FEC packet
  • the FEC decoder in the set top box periodically feeds back to the FEC encoder in the stream server, where the number of FEC packet loss packets is distributed;
  • an IPTV system for dynamically adaptive forward error control of IP network packet loss.
  • the system includes an FEC encoder nested in the stream server, an FEC decoder nested in the set top box, and an authentication server. The above three devices will be specifically described below.
  • the FEC encoder is configured to encode the source number packet in the stream service, and generate coded data including the source number packet and the multiple FEC data packets; receive the FEC packet based packet loss statistics result from the FEC decoder, and The number of FEC data packets sent by the copper FEC packet according to the statistical result;
  • the authentication server is configured to receive a registration request of the FEC decoder, query the user database, and return the result of the registration request to the FEC decoder;
  • the FEC decoder receives the source data packet and the FEC data packet through the IPTV network, and if the source data packet is lost in the network, the FEC packet is utilized and decoded to recover the lost source data packet in the streaming service;
  • the FEC packet based packet loss result of the IPTV network is sent to the FEC encoder in real time or in a certain period of time.
  • a method of combining source data and FEC data flow control techniques in an IPTV system is provided.
  • the main feature of this flow control technology is that when the FEC encoder sends a number to the FEC decoder, all media packets are sent first, and then all FEC packets are sent. Assuming that the transmission rate of the media data packet is m, the transmission code rate of the stream containing the source data packet and the FEC data packet is m ⁇ (1 + l/k) (considering the load of the FEC data packet on the IPTV network), When the media data packet and the FEC data packet are sequentially sent according to the flow control technology, the data rate sent by the streaming server is absolutely hooked, and the network congestion phenomenon is greatly reduced.
  • the dynamic adaptive feedback control method and system based on the forward error correction technology of the present invention can maximize the recovery capability of packet loss in the IPTV network, and effectively solve the audio and video quality problems caused by packet loss of the IPTV network.
  • FIG. 1 is a flow chart showing the process of authentication and compatibility between a set top box and a streaming server of the present invention through an authentication server;
  • FIG. 2 is a schematic diagram showing the principle of FEC encoding and decoding in a packet loss mode
  • Figure 3 is a construction matrix that implements the entire FEC encoding and decoding process
  • Figure 4 is a flow chart showing the FEC encoding process of the present invention
  • FIG. 5 is a flow chart showing the FEC decoding process of the present invention.
  • FIG. 6 is a format definition diagram of a FEC data packet of the present invention.
  • FIG. 7 is a format definition diagram of a FEC number FEC header of the present invention.
  • Figure 8 is a flow chart showing the dynamic adaptive FEC feedback control of the present invention.
  • Fig. 9 is a view showing the code rate uniform control of the present invention. detailed description
  • FIG. 1 is a schematic diagram showing the flow of authentication and compatibility between a set top box and a streaming server of the present invention through an authentication server.
  • an FEC-based IPTV system includes a set top box 100, an authentication server 102, and a stream server 104.
  • the data interaction between the set top box 100 and the stream server 102 can be implemented by the following process:
  • a registration request is sent by the set top box 100 to the authentication server 102;
  • the authentication server 102 receives the registration request and queries the information of the user database, which includes whether the user has the FEC authority;
  • the authentication server 102 sends a registration request result to the set top box 100, which includes the FEC authorization flag.
  • the set top box 100 requests the streaming server 104 for the streaming service based on the FEC authorization flag received via the server 102;
  • the streaming server 104 generates a request result based on the FEC authorization flag and sends it back to the set top box 100.
  • Step (5) Under the unicast service, the streaming server 104 determines whether to send the FEC data packet to the set top box 100 according to the FEC authorization flag, and allows subsequent FEC related operations. If the set top box 100 is not granted FEC rights, the stream server 104 still sends media data to it, but does not send FEC packets.
  • Step (5) the set top box 100 determines whether to start the FEC function according to the result of the stream service request sent back by the stream server 104.
  • the set-top box without FEC rights can receive the general media data stream as usual, but does not receive the FEC data packet.
  • FIG. 2 is a schematic diagram showing the principle of FEC encoding and decoding in the packet loss mode of the IPTV system.
  • n, k and L in the above principle is mainly determined by factors such as real-time requirements, network packet loss rate and FEC encoding and decoding efficiency of the IPTV system.
  • Figure 4 shows a flow chart of the FEC encoding process 400.
  • the encoding of the source data packet in the iPTV system can be implemented by the following process:
  • FIG. 5 shows a flow chart of the FEC decoding process 500.
  • the solution to the source packet in the IPTV system can be implemented in the following steps:
  • step (3) the media package of the group is complete and does not need FEC decoding 508, and returns to step (2);
  • the media package of the group is incomplete, and it is judged whether the FEC decoding condition 510 is satisfied;
  • step (2) If the FEC decoding condition is satisfied, the FEC decoding matrix 514 is generated, and FEC decoding and recovery of the lost media packet 518 are performed, and the process returns to step (2).
  • the present invention utilizes the feature of special processing of data with a matrix budget of 0, and adopts a method of adding control information of the FEC header to Fully solve the problems of long and short package combination and non-fixed length grouping. More specifically, for the combination of the long and short packets formed mainly because the media RTP packet is smaller than the normal length, the length of each media packet is used as the source data to participate in the FEC codec, and the encoded data is used as part of the FEC packet header. For combinations that do not reach the normal packet k, the FEC header is used to carry the special packet length flag, and the FEC decoder is used to recover with all 0 data.
  • Fig. 6 shows a format definition diagram of the FEC packet of the present invention
  • Fig. 7 shows a format definition diagram of the FEC packet header of the present invention.
  • the format of the FEC data packet has been redefined to realize the requirements based on Reed Solomon code and TS/RTP/UDP, TS/UDP or other RTP transmission, and the combination of long and short packets is solved.
  • the problem of non-fixed length grouping The RTP header of the FEC packet is defined according to RFC3550, and pt takes 96 as the payload type of the FEC.
  • Figure 7 describes the definition of the header format of the FEC packet:
  • Type indicates that the FEC is of type ⁇ , and more specifically, 1 is a normal grouping of RS codes, that is, there are k source data packets; 2 is a short packet, the number of packets is ⁇ sgn; other values are invalid;
  • the I field indicates the number of FEC packets to be sent by the packet
  • k represents the number of source packets contained in each group
  • type sg When the value of type sg is 2, it indicates the number of valid source packets contained in the short packet
  • Offset indicates the specific location of the FEC packet in the FEC codec
  • Sn base indicates the packet base number of the FEC packet, and if the data packet is an RTP packet, Secj of the RTP package;
  • max_payloadJen represents the maximum load length in the FEC packet, and if the data packet is an RTP packet, it is the maximum RTP packet length;
  • Len-recovery represents the load length recovery parameter and participates in FEC encoding and decoding as a special part of the FEC load
  • FIG 8 shows a schematic diagram of dynamic adaptive FEC feedback control.
  • the modification and control of the dynamic adaptive FEC parameters mainly depend on the statistics and feedback of the packet loss information of the FEC group on the FEC decoder side, and maximizes the packet loss recovery capability and minimizes the extra bandwidth occupation in the IPTV network.
  • the feedback control protocol is based on RTSP (Real Time Streaming Protocol). Referring to Figure 8, the feedback control can be divided into real-time feedback adjustment and statistical feedback adjustment according to the characteristics and requirements of the IPTV system.
  • the real-time feedback adjustment means that the FEC encoder (streaming server) 800 retransmits the FEC data packet to the FEC decoder (set top box > 802. Since the retransmitted data is an FEC packet instead of an RTP media packet, the adjustment method can support The multicast service can also effectively prevent the streaming media server from buffering too many RTP media packets or reading from the storage medium again. As shown by the solid line in FIG.
  • the FEC decoder 802 sends an RTSP extension command to the FEC encoder 800.
  • the FEC cataloger adjusts the number of FEC packets sent by the FEC group in real time according to the packet loss situation of the current FEC group.
  • the FEC real-time feedback adjustment only affects the FEC packet transmission of the current FEC group. The quantity does not change the default value of the system. Under this adjustment scheme, the FEC encoder 800 does not need to reply to the FEC decoder due to the real-time and efficiency requirements of the system.
  • the statistical feedback adjustment refers to the statistics of the current IPTV network packet loss status to the FEC encoder 800 after a period of time statistics, and the FEC encoder 800 determines the system according to the unicast or multicast service type and capability.
  • the number I of FEC packets sent by the middle FEC group is sent back to the FEC decoder 802.
  • the feedback adjustment scheme focuses on measuring the packet loss situation in the IPTV network in the case of FEC packets of k RTP media packets, and statistics the packet loss condition to determine the number I of FEC packet transmissions of the FEC group.
  • the FEC decoder 802 side counts the number of lost packets of each FEC group media packet in a period of time, and determines that the packet loss rate is reduced when the packet length is k. The minimum I value of the FEC packet required to a certain extent.
  • the FEC decoder 802 first transmits the RTSP extension command SET_DFT_FEC to the FEC encoder 800, and sets the number I of the FEC packet transmission of the current FEC group according to the statistics of the network packet loss. Subsequently, the FEC encoder 800 transmits an RTSP extended command SET_DFT-FEC to the FEC decoder 802 as a response.
  • Fig. 9 is a view showing the code rate uniform control of the present invention.
  • the RTP media packet has a code rate of m.
  • its transmission rate is m x (1+l/k).

Landscapes

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

Abstract

L'invention concerne un procédé permettant d'effectuer une correction d'erreurs au moyen d'une correction d'erreurs sans voie de retour (FEC) adaptative dynamique dans un système IPTV lorsque les paquets de données manquent sur un réseau IP. Le procédé comporte un ajustement de rétroaction en temps réel et un ajustement de rétroaction de comptage. Pendant l'ajustement de rétroaction en temps réel, un décodeur FEC envoie à un codeur FEC le nombre de paquets de données manquants du paquet FEC obtenu par comptage, et le codeur FEC ajuste le nombre de paquets de données FEC du paquet FEC courant à transmettre. Pendant l'ajustement de rétroaction de comptage, le décodeur FEC compte la condition des paquets de données manquants du paquet FEC sur un réseau IPTV pendant une certaine période de temps, et, en conséquence, le codeur FEC ajuste le nombre des paquets de données FEC de la totalité des paquets FEC à transmettre de façon séquentielle. De plus, la présente invention concerne un système IPTV permettant d'effectuer un contrôle adaptatif et dynamique d'erreurs sans voie de retour de la transmission du contenu de séquence vidéo sur un réseau. Ledit système comporte un boîtier décodeur, un serveur de diffusion en continu et un serveur d'authentification. Le système et le procédé de la présente invention permettent d'effectuer un contrôle adaptatif et dynamique d'erreurs du mode de transmission sur un réseau IP qui fournit une meilleure possibilité de restaurer des paquets de données manquants sur un réseau IPTV et de résoudre efficacement le problème de la dégradation de la qualité de l'audio/vidéo due aux paquets de données manquants sur un réseau IP.
PCT/CN2008/000664 2007-04-02 2008-04-02 Système et procédé de correction d'erreurs sans voie de retour adaptative dynamique dans un réseau iptv WO2008119259A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200710095954.5 2007-04-02
CN200710095954A CN100592670C (zh) 2007-04-02 2007-04-02 一种在iptv网络中动态自适应前向差错控制的系统及方法

Publications (1)

Publication Number Publication Date
WO2008119259A1 true WO2008119259A1 (fr) 2008-10-09

Family

ID=38715943

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2008/000664 WO2008119259A1 (fr) 2007-04-02 2008-04-02 Système et procédé de correction d'erreurs sans voie de retour adaptative dynamique dans un réseau iptv

Country Status (2)

Country Link
CN (1) CN100592670C (fr)
WO (1) WO2008119259A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102438182A (zh) * 2010-09-29 2012-05-02 中兴通讯股份有限公司 一种视频流分析方法及装置
CN113905226A (zh) * 2021-09-08 2022-01-07 深圳市九洲电器有限公司 机顶盒播放故障修复方法、服务器、系统及存储介质

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100592670C (zh) * 2007-04-02 2010-02-24 Ut斯达康通讯有限公司 一种在iptv网络中动态自适应前向差错控制的系统及方法
CN101221752B (zh) * 2008-01-24 2010-07-14 中兴通讯股份有限公司 Iptv系统实现个性卡拉ok业务的方法、装置及系统
CN101938324B (zh) * 2009-06-29 2013-01-02 华为技术有限公司 一种网络媒体流播放方法与装置
CN101646089B (zh) * 2009-09-03 2012-09-05 中兴通讯股份有限公司 建立中继频道中丢包补偿的方法、装置和系统
CN102082624A (zh) * 2009-11-26 2011-06-01 中国电信股份有限公司 WiFi编码优化方法及系统
CN101778295B (zh) * 2009-12-25 2012-11-14 中兴通讯股份有限公司 一种视频监控系统及其前向纠错的方法
US10009144B2 (en) 2011-12-15 2018-06-26 Qualcomm Incorporated Systems and methods for pre-FEC metrics and reception reports
EP2645628B1 (fr) * 2012-03-29 2015-06-17 Alcatel Lucent Détection en continu de flux IPTV morts ou altérés
WO2014205724A1 (fr) * 2013-06-27 2014-12-31 华为技术有限公司 Procédé de traitement de retransmission automatique, dispositif terminal d'émission et dispositif terminal de réception
CN103596068B (zh) * 2013-11-01 2018-03-16 李常春 基于媒体丢包率指标的iptv业务健康度评价方法
FR3041194B1 (fr) * 2015-09-16 2017-09-01 Vogo Procede d'optimisation de transmission de flux de donnees video dans un reseau sans fil
CN106937134B (zh) * 2015-12-31 2021-03-02 深圳市潮流网络技术有限公司 一种数据传输的编码方法、编码发送装置及系统
CN107483144B (zh) * 2016-06-07 2021-11-23 中兴通讯股份有限公司 前向纠错反馈信息传输方法、装置
CN106506114A (zh) * 2016-10-21 2017-03-15 中国科学院上海高等研究院 基于应用层前向纠错技术的实时流传输系统及其方法
CN111162877A (zh) * 2020-01-19 2020-05-15 西安邮电大学 一种音视频服务质量控制的自适应前向纠错方法及应用
CN114866195A (zh) * 2022-07-07 2022-08-05 深圳市江元科技(集团)有限公司 一种使用安卓系统控制热敏打印机的方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5600663A (en) * 1994-11-16 1997-02-04 Lucent Technologies Inc. Adaptive forward error correction system
WO2006060036A1 (fr) * 2004-12-02 2006-06-08 Thomson Licensing Correction d'erreur adaptative sans voie de retour
WO2006074408A2 (fr) * 2005-01-06 2006-07-13 Terayon Communication Systems, Inc. Systeme adaptatif de distribution d'information utilisant la retroaction de correction aval des erreurs
CN101030838A (zh) * 2007-04-02 2007-09-05 Ut斯达康通讯有限公司 一种在iptv网络中动态自适应前向差错控制的系统及方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5600663A (en) * 1994-11-16 1997-02-04 Lucent Technologies Inc. Adaptive forward error correction system
WO2006060036A1 (fr) * 2004-12-02 2006-06-08 Thomson Licensing Correction d'erreur adaptative sans voie de retour
WO2006074408A2 (fr) * 2005-01-06 2006-07-13 Terayon Communication Systems, Inc. Systeme adaptatif de distribution d'information utilisant la retroaction de correction aval des erreurs
CN101030838A (zh) * 2007-04-02 2007-09-05 Ut斯达康通讯有限公司 一种在iptv网络中动态自适应前向差错控制的系统及方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102438182A (zh) * 2010-09-29 2012-05-02 中兴通讯股份有限公司 一种视频流分析方法及装置
CN113905226A (zh) * 2021-09-08 2022-01-07 深圳市九洲电器有限公司 机顶盒播放故障修复方法、服务器、系统及存储介质
CN113905226B (zh) * 2021-09-08 2023-09-19 深圳市九洲电器有限公司 机顶盒播放故障修复方法、服务器、系统及存储介质

Also Published As

Publication number Publication date
CN100592670C (zh) 2010-02-24
CN101030838A (zh) 2007-09-05

Similar Documents

Publication Publication Date Title
WO2008119259A1 (fr) Système et procédé de correction d'erreurs sans voie de retour adaptative dynamique dans un réseau iptv
JP5442816B2 (ja) 可変ｆｅｃオーバヘッド及び保護期間を利用したストリーミング及びバッファリング
KR101571145B1 (ko) 무선 근거리 네트워크들에서의 신뢰 가능한 멀티캐스트를 위해 병합된 자동 반복 요청으로 적응 순방향 에러 정정을 하기 위한 방법 및 장치
CN106656422B (zh) 一种动态调整fec冗余度的流媒体传输方法
US7653055B2 (en) Method and apparatus for improved multicast streaming in wireless networks
CN102118653B (zh) 保障网络电视直播业务的业务服务质量的方法和设备
US20090103635A1 (en) System and method of unequal error protection with hybrid arq/fec for video streaming over wireless local area networks
US8395990B2 (en) Method and apparatus for streaming scalable multimedia data streams
RU2415482C2 (ru) Система и способ управления избыточностью
US20100214970A1 (en) Method and system for transmitting data packets from a source to multiple receivers via a network
KR20040009928A (ko) 전송제어 파라미터 생성방법 및 프레임 특성에 따른선택적 자동 재전송 방법
EP2912845B1 (fr) Transmission en continu de vidéo améliorée avec une correction d'erreur sans circuit de retour de couche d'application
WO2017209308A1 (fr) Demande de retransmission de données dans un réseau à destinataires multiples
US8127196B2 (en) Server and client for determining error restoration according to image data transmission, and method of determining error restoration according to image data transmission
JP2010119133A (ja) パケット送信装置、通信システム及びプログラム
Nguyen et al. Hybrid ARQ-random network coding for wireless media streaming
Setton et al. Adaptive multiple description video streaming over multiple channels with active probing
CN103428531A (zh) 一种多媒体数据的arq控制方法及系统
JP2005033556A (ja) データ送信装置、データ送信方法、データ受信装置、データ受信方法
CN101645903A (zh) 一种多媒体数据的传输方法及装置
Choi et al. A Novel Design and Analysis of Cross-Layer Error-Control for H. 264 Video over Wireless LAN
GHAIDA An efficient error-robust wireless video transmission using link-layer FEC and low-delay ARQ schemes
Pradhan et al. Broadcasting video over the Cellular network and the Internet
Al-Suhail et al. A Cross-Layer Model for Video Multicast Based TCP-Adaptive FEC over Heterogeneous Networks

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08733878

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 08733878

Country of ref document: EP

Kind code of ref document: A1