WO2006107424A2 - Mecanisme de changement rapide de canal multimedia et noeud de reseau d'acces comprenant ce mecanisme - Google Patents

Mecanisme de changement rapide de canal multimedia et noeud de reseau d'acces comprenant ce mecanisme Download PDF

Info

Publication number
WO2006107424A2
WO2006107424A2 PCT/US2006/005645 US2006005645W WO2006107424A2 WO 2006107424 A2 WO2006107424 A2 WO 2006107424A2 US 2006005645 W US2006005645 W US 2006005645W WO 2006107424 A2 WO2006107424 A2 WO 2006107424A2
Authority
WO
WIPO (PCT)
Prior art keywords
media stream
packets
reception
buffer
request
Prior art date
Application number
PCT/US2006/005645
Other languages
English (en)
Other versions
WO2006107424A3 (fr
Inventor
Randall B. Sharpe
Ben Crosby
Original Assignee
Alcatel Lucent
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
Priority claimed from US11/282,355 external-priority patent/US20060224745A1/en
Application filed by Alcatel Lucent filed Critical Alcatel Lucent
Priority to KR1020077025347A priority Critical patent/KR101223806B1/ko
Publication of WO2006107424A2 publication Critical patent/WO2006107424A2/fr
Publication of WO2006107424A3 publication Critical patent/WO2006107424A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/235—Processing of additional data, e.g. scrambling of additional data or processing content descriptors
    • 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
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/23614—Multiplexing of additional data and video streams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/435—Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
    • H04N21/4383—Accessing a communication channel
    • H04N21/4384—Accessing a communication channel involving operations to reduce the access time, e.g. fast-tuning for reducing channel switching latency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/64—Addressing
    • H04N21/6405—Multicasting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/64—Addressing
    • H04N21/6408—Unicasting

Definitions

  • the disclosures made herein relate generally to communications networks and, more particularly, to media channel changing mechanisms in communications networks.
  • Standard video compression algorithms such as the MPEG2 standard of the International telecommunication Union's Moving Pictures Experts Group and the H.264 of the Video Coding Experts Group compress video sequences known as Groups of Pictures (GOPs). Each GOP has a respective beginning and/or ending boundary and contains video content that lasts a fraction of a second to as long as several seconds.
  • GOP Groups of Pictures
  • Each GOP has a respective beginning and/or ending boundary and contains video content that lasts a fraction of a second to as long as several seconds.
  • video is one example of streaming media in the context of the present invention, it is not the only type of streaming media.
  • streaming media includes other forms of media such as audio media and non-video forms of visual media.
  • Channel change latency is important to the satisfactory television viewing experience and other types of streaming media experiences.
  • Switching to a highly compressed digital video stream can take a second or more before the image begins to be displayed.
  • a video decoder cannot begin decoding a video stream until a GOP boundary is recognized. Accordingly, if upon a channel change a decoder begins receiving a new video stream while a GOP transmission of a previous video stream is in progress, the video decoder must wait for the next GOP boundary of that video stream before beginning decoding GOPs of the new stream. [0005] This need to wait for the next GOP boundary increases channel change latency by approximately the "wait time" for the next GOP boundary to present itself.
  • One conventional approach for decreasing the wait time is to have short GOPs so that the wait time is relatively brief.
  • Embodiments of the present invention provide a mechanism for facilitating rapid changing of media channels via an access node, which significantly reduces interoffice traffic.
  • media stream channel change functionality is implemented via an access node for media streams that are frequently requested and served through the access node.
  • Packets containing Groups of Pictures (GOPs) for such frequently requested media streams are stored in a buffer of the access node, thus enabling at least a portion of the media stream to be unicast from the access node.
  • GOPs Groups of Pictures
  • a media channel changing mechanism in the access node advantageously reduces channel change latency and contributes to increased network resource utilization efficiency.
  • rapid channel change functionality for certain channels (e.g., popular channels) in the access node, the amount of traffic crossing the network is dramatically reduced with respect to such conventional rapid channel change techniques.
  • embodiments of the present invention advantageously overcome one or more drawbacks associated with conventional approaches for facilitating rapid channel changing functionality in a communications network. [0009]
  • a method is provided for enabling rapid media stream channel changes in conjunction with increasing network resource utilization efficiency.
  • Packets containing one or more GOPs of a media stream are stored in a buffer of an access node.
  • a request for reception of the media stream is received from a decoder.
  • At least a portion of the packets are unicast from the access node for reception by the decoder.
  • a media stream is multicast for reception by a plurality of requesting decoders and packets containing one or more Groups of Pictures (GOPs) of the media stream are stored in a buffer of an access node. At least a portion of the packets are unicast from the access node for reception by a new requesting decoder in response to receiving from the new requesting decoder a request for reception designating a media stream identifier corresponding to the media stream.
  • an access network element comprises at least one data processing device, a buffer connected to the data processing device, memory connected to the data processing device and instructions accessible from the memory and processable by the data processing device.
  • the instructions are configured for enabling the data processing device to facilitate storing packets of a media stream in the buffer, receiving from a decoder a request for reception of the media stream and unicasting at least a portion of the packets from the access node for reception by the decoder in response to receiving the request for reception.
  • an operation is performed for assessing information upon which a determination for storing the packets of the media stream in the buffer is made such that storing of the packets of the media stream is performed in response to the information indicating that the packets of the media stream should be stored in the buffer.
  • an operation is performed for assessing information for determining whether the packets of the media stream stored in the buffer correspond to a media stream identifier designated in the request for reception such that unicasting of the packets of the media stream is performed in response to determining that at least a portion of the packets of the media stream stored in the buffer correspond to the media stream identifier designated in the request for reception.
  • an operation is performed for forwarding the request for reception from the access node for reception by a more centrally located network element in response to determining that none of the packets of the media stream stored in the buffer correspond to the media stream identifier designated in the request for reception.
  • an operation is performed for multicasting a designated media stream to a new decoder after bringing packet transmission of a unicast media stream into alignment with packet transmission of the multicast media stream corresponding to the unicast media stream.
  • unicasting of packets is performed in a manner such that packet transmission of the unicasting is in alignment with packet transmission of a corresponding media stream being provided to a plurality of other decoders via multicasting and such that the media stream is provided to the decoder via the multicasting after the packet transmission of the unicasting is brought into alignment with packet transmission of the corresponding multicast media stream.
  • FIG. 1 depicts an embodiment of a method for facilitating rapid media channel change functionality in accordance with the present invention.
  • FIG. 2 depicts an embodiment of an access network node configured for carrying to the method for facilitating rapid media channel change functionality depicted in FIG. 1.
  • FIG. 1 depicts an embodiment of a method in accordance with the present invention, which is referred to herein as the method 100.
  • the method 100 is performed by an access node of an access network and provides for facilitating rapid media stream channel changes via channel change functionality residing at an access node.
  • a television channel is a preferred embodiment of such a media stream channel.
  • the method 100 advantageously reduces channel change latency and contributes to increased network resource utilization efficiency thereby overcoming one or more drawbacks associated with conventional approaches for changing media channels in a communications network.
  • the method 100 begins an operation 102 for receiving a multicast media stream such as, for example, a multicast video stream.
  • the media stream comprises a stream of packet groups referred to in the art as Groups of Pictures (GOPs).
  • GOPs Groups of Pictures
  • an operation 104 is performed for assessing storage decision information upon which a determination of whether or not to store packets of the media stream in a buffer of the access node is made and an operation 106 is simultaneously performed for forwarding the multicast media stream (i.e., packets of the media stream) to recipients downstream of the access node.
  • the multicast media stream i.e., packets of the media stream
  • an operation 108 is performed for storing packets of the media stream in the buffer of the access node.
  • the operation 108 for storing includes continually storing in the buffer the packets of the media stream most recently received at the access node.
  • the most recently received GOPs of the media stream are available for being retrieved for enabling rapid media channel changing functionality in accordance with the present invention to be performed.
  • storage of packets corresponding to the most recent several seconds of the media stream is sufficient for enabling media channel changing functionality in accordance with the present invention.
  • a buffer in accordance with the present invention can functionally be thought of as a delay line or a circular buffer.
  • a delay line provides the functionality of introducing a calculated delay into the transmission of a signal.
  • a circular buffer provides the functionality of holding data written by one process and read by another. In such cases, separate read and write pointers are used that are not allowed to cross each other so that unread data cannot be overwritten by new data. When the circular buffer is filled, new data is written starting at the beginning of the buffer.
  • facilitating channel changing in accordance with the present invention does not require all media stream channels to be available (i.e., stored) at the access node.
  • the method is configured for continually or periodically assessing the storage decision information for determining conditions in which the media stream is to be stored in the buffer. Accordingly, in response to assessment of the storage decision information indicating that the packets of the media stream should not be stored in the buffer, the operation 104 for assessing storage decision information is repeated in either a continuous or periodic manner.
  • rapid media channel changing functionality in accordance with the present invention is not limited to one media stream.
  • rapid media channel changing functionality in accordance with the present invention may be facilitated for a plurality of media channels.
  • a single buffer may be suitably configured and/or utilized for facilitating such rapid media channel changing functionality or, optionally, a plurality of buffers may be suitably configured and/or utilized for facilitating such rapid media channel changing functionality.
  • an operation 110 is performed for receiving from a requesting decoder (e.g., a decoder of a subscriber set top box (STB)) a request for reception of the media stream.
  • a requesting decoder e.g., a decoder of a subscriber set top box (STB)
  • the request for reception is transmitted from the requesting decoder upstream for reception by a network element configured for and capable of facilitating delivery of a media stream designated in the request to the requesting decoder.
  • the request for reception includes a media stream identifier such as an identifier of a channel, an identifier for a media stream title, an identifier for a media stream reference number etc.
  • an operation 112 is performed for assessing information for determining whether or not the packets of the media stream stored in the buffer correspond to the media stream identifier designated in the request for reception.
  • An operation 114 is performed for unicasting the packets of the media stream for reception by the requesting decoder in response to determining that at least a portion of the packets of the media stream stored in the buffer corresponds to the media stream identifier designated in the request for reception.
  • Unicasting of the packets of the media stream includes retrieving the packets from the buffer and begins at the GOP boundary of the most recent GOP that is in the process of being received stored in the buffer. It is disclosed herein that the complete GOP does not need to be in the buffer at the time when unicasting begins. Such buffering functionality can be accomplished through the use of a circular buffer or delay line. In this manner, the same media content being multicast via the operation 106 is provided to the requesting decoder by the operation 114 for unicasting the packets of the media stream.
  • An operation 116 is performed for forwarding the request for reception from the access node for reception by a more centrally located network element (i.e., closer to the core of the access network or within the aggregation network) in response to determining that none of the packets of the media stream stored in the buffer correspond to the media stream identifier designated in the request for reception.
  • the set-top box knows which server is responsible for which streams.
  • an access node will not receive request for streams that it doesn't have and won't have to forward such requests to other servers.
  • the operation 116 is omitted.
  • Unicasting consumes unnecessary network resources in the case where the media stream is concurrently being multicast to other decoders.
  • an operation 118 is performed for performing the unicasting such that packet transmission of the unicasting is in alignment with packet transmission of the media stream being multicast (i.e., a corresponding media stream being multicast via the same access node).
  • an operation 120 is performed for providing the media stream to the requesting decoder via the multicast video stream, followed by an operation 122 being performed for terminating the unicasting of the packets of the media stream.
  • This alignment can be accomplished by transmitting the unicast stream at faster than realtime. However, this approach is implemented at the expense of consumption of scarce DSL bandwidth capacity. Alternatively, alignment can be accomplished by intelligently discarding packets that cause little damage to the reconstructed video thereby bringing the temporal alignment of the unicast media stream into alignment with that of the multicast media stream. For instance, B- frames generally make up about half of the frames within a GOP and their absence is seldom visually noticeable. [0030] In accordance with the present invention, transmitting the unicast stream at faster than real-time enables delay between multicasting of media stream and unicasting of the video stream to be pushed from the access node to the requesting decoder.
  • a buffering device of the requesting decoder is made to serve as a delay device.
  • the requesting device begins receiving the media stream via the multicasting and unicasting of the media stream is terminated.
  • playback via the requesting decoder is time delayed with respect to playback on decoders that earlier began receiving the media stream via multicasting.
  • displayed images outputted by the requesting decoder will be time delayed with respect to such decoders that earlier began receiving the media stream via multicasting.
  • displayed content from the requesting decoder could be of earlier time, same time, or later time compared to other decoders receiving the same media stream.
  • the specific temporal relationship of displayed content for different decoders will depend on when respective channel changes were requested relative to time of the most recent GOP boundary. For example, a first decoder may have requested a channel where the GOP boundary was most of a GOP in the past while a second decoder may have requested a channel where the GOP boundary just occurred whereby the first decoder will be delayed with respect to the second decoder.
  • unicasting via the buffer can be used indefinitely. This would not be feasible for a rapid channel change solution deployed at a more central point in the network. However, it is entirely feasible through implementation of rapid channel change functionality in accordance with the present invention.
  • FIG.2 depicts an embodiment of an access network node (i.e., access node) in accordance with the present invention, which is referred to herein as the access network node 200.
  • the access network node 200 is configured for carrying out rapid channel change functionality in accordance with the present invention.
  • the access network node 200 is suitably configured for enabling the method 100 discussed above in reference to FIG. 1 to be carried out.
  • the access node 200 includes a data processing device 205, a buffer 210, memory 215, a network-facing network interface 220 and a CPE (customer premise equipment) facing network interlace 223.
  • the data processing device 205, the buffer 210, the memory 215, the network-facing network interface 220 and the CPE-facing network interface 223 are interconnected for enabling interaction therebetween.
  • the network-facing network interface 220 receives media stream packets from an upstream source and the CPE-facing network interface 223 forwards media stream packets for reception by downstream customer premise equipment.
  • the instructions 225 are accessible from within the memory 215 and are processable by the data processing device 205.
  • the instructions 225 are configured for enabling the data processing device 205 to facilitate the operations of storing packets of a media stream in the buffer 210, receiving from a decoder a request for reception of the media stream and unicasting at least a portion of the packets from the access network node for reception by the decoder in response to receiving the request for reception. Transmission operations such as multicasting, unicasting, receiving request for receptions and forwarding request for receptions are facilitated via the network interface 220.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

La présente invention se rapporte à un procédé favorisant des changements rapides de canaux de trains multimédia ainsi que l'accroissement simultané de l'efficacité d'utilisation des ressources de réseau. Un train de données multimédia fait l'objet d'une multi-diffusion aux fins de sa réception par une pluralité de décodeurs requérants. Ce train de données multimédia comprend des paquets contenant des groupes d'images (GOP groups of pictures) qui sont stockés dans un tampon d'un noeud d'accès. Au moins une partie des paquets fait l'objet d'une diffusion unique à partir du noeud d'accès aux fins de sa réception par un nouveau décodeur requérant lors de la réception par le nouveau décodeur requérant d'une demande de réception désignant un identificateur de train de données multimédia correspondant à ce train de données multimédia. Ensuite, le train de données multimédia fait l'objet d'une multi-diffusion à destination du nouveau décodeur après alignement de la transmission des paquets du train de données multimédia de la diffusion unique avec la transmission des paquets du train de données multimédia de la multi-diffusion.
PCT/US2006/005645 2005-04-01 2006-02-16 Mecanisme de changement rapide de canal multimedia et noeud de reseau d'acces comprenant ce mecanisme WO2006107424A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020077025347A KR101223806B1 (ko) 2005-04-01 2006-02-16 신속 미디어 채널 변경 메커니즘 및 이를 포함하는 액세스네트워크 노드

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US66735705P 2005-04-01 2005-04-01
US60/667,357 2005-04-01
US11/282,355 US20060224745A1 (en) 2005-04-01 2005-11-18 Error recovery mechanism and network element comprising same
US11/282,355 2005-11-18

Publications (2)

Publication Number Publication Date
WO2006107424A2 true WO2006107424A2 (fr) 2006-10-12
WO2006107424A3 WO2006107424A3 (fr) 2007-06-28

Family

ID=37073908

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2006/005645 WO2006107424A2 (fr) 2005-04-01 2006-02-16 Mecanisme de changement rapide de canal multimedia et noeud de reseau d'acces comprenant ce mecanisme

Country Status (2)

Country Link
KR (1) KR101223806B1 (fr)
WO (1) WO2006107424A2 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1993289A1 (fr) * 2007-05-16 2008-11-19 Nokia Siemens Networks Oy Système doté de délais de commutations améliorés entre porteurs de diffusion/multidiffusion
WO2009132673A1 (fr) 2008-05-02 2009-11-05 Telefonaktiebolaget Lm Ericsson (Publ) Contrôle d'acheminements de contenus dans des réseaux de diffusion/multidiffusés
EP2123043A2 (fr) * 2007-02-12 2009-11-25 Cisco Technology, Inc. Changement de voie rapide sur un réseau à bande passante limitée
US7937531B2 (en) 2007-02-01 2011-05-03 Cisco Technology, Inc. Regularly occurring write back scheme for cache soft error reduction
US7940644B2 (en) 2007-03-14 2011-05-10 Cisco Technology, Inc. Unified transmission scheme for media stream redundancy
US9083585B2 (en) 2006-09-11 2015-07-14 Cisco Technology, Inc. Retransmission-based stream repair and stream join

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7965771B2 (en) 2006-02-27 2011-06-21 Cisco Technology, Inc. Method and apparatus for immediate display of multicast IPTV over a bandwidth constrained network
US8218654B2 (en) 2006-03-08 2012-07-10 Cisco Technology, Inc. Method for reducing channel change startup delays for multicast digital video streams
US8787153B2 (en) 2008-02-10 2014-07-22 Cisco Technology, Inc. Forward error correction based data recovery with path diversity
KR100979482B1 (ko) * 2009-04-10 2010-09-02 주식회사 쿠오핀 재핑 딜레이 감소를 위한 유니캐스트와 멀티캐스트 스트림 절체방법 및 그 장치

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040098748A1 (en) * 2002-11-20 2004-05-20 Lan Bo MPEG-4 live unicast video streaming system in wireless network with end-to-end bitrate-based congestion control

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6973667B2 (en) * 2001-03-01 2005-12-06 Minerva Networks, Inc. Method and system for providing time-shifted delivery of live media programs

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040098748A1 (en) * 2002-11-20 2004-05-20 Lan Bo MPEG-4 live unicast video streaming system in wireless network with end-to-end bitrate-based congestion control

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9083585B2 (en) 2006-09-11 2015-07-14 Cisco Technology, Inc. Retransmission-based stream repair and stream join
US7937531B2 (en) 2007-02-01 2011-05-03 Cisco Technology, Inc. Regularly occurring write back scheme for cache soft error reduction
EP2123043A2 (fr) * 2007-02-12 2009-11-25 Cisco Technology, Inc. Changement de voie rapide sur un réseau à bande passante limitée
EP2123043A4 (fr) * 2007-02-12 2010-09-29 Cisco Tech Inc Changement de voie rapide sur un réseau à bande passante limitée
US7940644B2 (en) 2007-03-14 2011-05-10 Cisco Technology, Inc. Unified transmission scheme for media stream redundancy
EP1993289A1 (fr) * 2007-05-16 2008-11-19 Nokia Siemens Networks Oy Système doté de délais de commutations améliorés entre porteurs de diffusion/multidiffusion
WO2008138793A1 (fr) * 2007-05-16 2008-11-20 Nokia Siemens Networks Oy Système ayant des temps de commutation améliorés entre des porteuses de diffusion/multidiffusion
WO2009132673A1 (fr) 2008-05-02 2009-11-05 Telefonaktiebolaget Lm Ericsson (Publ) Contrôle d'acheminements de contenus dans des réseaux de diffusion/multidiffusés
US8954598B2 (en) 2008-05-02 2015-02-10 Telefonaktiebolaget L M Ericsson (Publ) Control of content delivery in broadcast/multicast networks

Also Published As

Publication number Publication date
KR101223806B1 (ko) 2013-01-17
WO2006107424A3 (fr) 2007-06-28
KR20080004561A (ko) 2008-01-09

Similar Documents

Publication Publication Date Title
US7804831B2 (en) Rapid media channel changing mechanism and access network node comprising same
KR101223806B1 (ko) 신속 미디어 채널 변경 메커니즘 및 이를 포함하는 액세스네트워크 노드
US8516531B2 (en) Reducing channel change delays
US7788393B2 (en) Switching a client from unicasting to multicasting by increasing the unicast stream rate to the client
US7430222B2 (en) Media stream splicer
US8140699B2 (en) Switching a client from unicasting to multicasting by simultaneously providing unicast and multicast streams to the client
KR101178853B1 (ko) 채널 변경 응답 시간 향상 방법 및 채널 변경 응답 시간 향상 장치
CN101938456B (zh) 一种减小媒体延迟的方法、设备及系统
CN101132521A (zh) 一种实现iptv频道切换的方法和装置
CN1893364A (zh) 广播多媒体流中的关键信息同步
US20040125816A1 (en) Method and apparatus for providing a buffer architecture to improve presentation quality of images
WO2009095078A1 (fr) Procédé et appareil pour l'obtention de contenu multimédia par l'intermédiaire d'un réseau de communications
KR100848309B1 (ko) 고속 버퍼링 스위치를 이용한 인터넷 방송 서비스 제공방법 및 그 장치
US8401086B1 (en) System and method for increasing responsiveness to requests for streaming media
WO2009080114A1 (fr) Procédé et appareil de distribution de contenu multimédia dans un réseau de communications
WO2009089755A1 (fr) Procédé et dispositif pour améliorer l'expérience de l'utilisateur de la télévision par ip
WO2009080117A1 (fr) Procédé et appareil de distribution de contenu multimédia dans un réseau de communications

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 7787/DELNP/2007

Country of ref document: IN

WWE Wipo information: entry into national phase

Ref document number: 1020077025347

Country of ref document: KR

NENP Non-entry into the national phase

Ref country code: RU

122 Ep: pct application non-entry in european phase

Ref document number: 06735347

Country of ref document: EP

Kind code of ref document: A2