WO2010140867A2 - Serveur de flux continu et terminal mobile pour réduire un retard de changement de canal, et procédé pour ce serveur et ce terminal - Google Patents

Serveur de flux continu et terminal mobile pour réduire un retard de changement de canal, et procédé pour ce serveur et ce terminal Download PDF

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Publication number
WO2010140867A2
WO2010140867A2 PCT/KR2010/003612 KR2010003612W WO2010140867A2 WO 2010140867 A2 WO2010140867 A2 WO 2010140867A2 KR 2010003612 W KR2010003612 W KR 2010003612W WO 2010140867 A2 WO2010140867 A2 WO 2010140867A2
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WO
WIPO (PCT)
Prior art keywords
data
channel
layer data
base layer
stream
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/KR2010/003612
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English (en)
Korean (ko)
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WO2010140867A3 (fr
Inventor
조재형
이상호
김영진
나지현
문정모
김대익
김재호
현은희
노현석
박철
임선화
윤미영
조호중
서덕영
김철근
박은주
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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
Priority claimed from KR1020100052320A external-priority patent/KR20100131365A/ko
Application filed by Electronics and Telecommunications Research Institute ETRI filed Critical Electronics and Telecommunications Research Institute ETRI
Priority to US13/254,534 priority Critical patent/US8650592B2/en
Publication of WO2010140867A2 publication Critical patent/WO2010140867A2/fr
Publication of WO2010140867A3 publication Critical patent/WO2010140867A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309—Transmission or handling of upstream communications
    • H04N7/17318—Direct or substantially direct transmission and handling of requests
    • 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

Definitions

  • Embodiments of the present invention relate to a method for transmitting multimedia content having hierarchically separated quality to a mobile device.
  • the present invention relates to an apparatus and method for reducing a zapping delay while reducing the use of communication resources.
  • the zapping delay is known to be about 3 to 5 seconds.
  • a method of receiving a large amount of data instantaneously in a short burst (burst) in order to reduce the delay used for reception, and the burst is about 4 to 5 seconds can be repeated.
  • the zapping delay may occur as long as the time until the burst corresponding to the changed channel is received.
  • the base layer data of all channels are configured as a preview stream, transmitted per time slice, and when the channel is changed, the screen is output using the base layer data of the requested channel to reduce channel zapping. It provides an apparatus and method that can be.
  • the streaming server for reducing a channel change delay the encoder for classifying and encoding each of a plurality of channel data to the base layer data and enhancement layer data, the time slice unit of the encoded data for each channel
  • the splitter may include: a splitter configured to divide the data into a splitter, a periodic data transmitter configured to transmit time slice period data for each channel, and a stream transmitter configured to transmit data divided into the time slice at a predetermined time.
  • the stream transmission unit, the main stream transmission unit for transmitting the main stream including the base layer data and enhancement layer data for each channel and the preview stream including base layer data for all channels may include a preview stream transmission unit.
  • the slice stream may be transmitted during the slice interval, and the preview stream transmitter may collect all or a portion of the base layer data for the entire channel and transmit the slice in every time slice interval.
  • a mobile terminal for reducing a channel change delay may include a periodic data receiver for receiving time slice period data for each channel, a viewing channel, and a reception period for receiving data of the selected viewing channel.
  • an output unit for outputting a screen wherein the output unit may output a screen by using base layer data of a change channel included in the preview stream when a channel change request is made.
  • the slice stream may be transmitted during the slice interval, and the preview stream transmitter may collect all or a portion of the base layer data for the entire channel and transmit the slice in every time slice interval.
  • the channel data receiving unit for switching the data receiving module to the active mode when the reception cycle is reached, and switching the data receiving module to the sleep mode if it does not correspond to the set period
  • a hierarchical classifier that classifies the received main stream data and the preview stream data into enhancement layer data and base layer data, and an internal memory that stores the classified data.
  • the channel data receiver may receive only the main stream data.
  • the channel data receiver may additionally receive only the preview stream data when the channel change request is continuously performed for a predetermined number of times or more.
  • the base layer data for all channels are configured as a preview stream, transmitted for each time slice, and when the channel is changed, the screen is output by using the base layer data of the channel requested to be changed.
  • 1 is a diagram illustrating a time slicing method applied to DVB-H.
  • FIG. 2 is a block diagram illustrating a streaming server for reducing a channel change delay according to an embodiment of the present invention.
  • FIG. 3 is a block diagram illustrating a mobile terminal for reducing a channel change delay according to an embodiment of the present invention.
  • FIG. 4 is a diagram illustrating a process of configuring a main stream and a preview stream according to an embodiment of the present invention.
  • FIG. 5 is a diagram illustrating a process of configuring a main stream according to an embodiment of the present invention.
  • FIG. 6 is a diagram illustrating a process of configuring time slices having different time interval lengths according to one embodiment of the present invention.
  • FIG. 7 is a diagram illustrating a streaming method for reducing channel change delay according to one embodiment of the present invention.
  • FIG. 8 is a diagram illustrating a streaming method for reducing a channel change delay according to another embodiment of the present invention.
  • 1 is a diagram illustrating a time slicing method applied to DVB-H.
  • the DVB-H transmits data in burst form.
  • the actual transmission rate is determined according to the burst duration and the repetition period, and the service is provided at an average bandwidth.
  • Each burst contains time information when the next burst is received. If there is no time information when receiving from the middle of a broadcast program, all sections including the section become impossible to receive and wait several seconds until the burst is received again. Thus, the next burst is received in each burst as described above. Contains time information.
  • DVB-H Digital Video Broadcasting-Handheld
  • the MPE-FEC Multi Protocol Encapsulation Forward Error Correction
  • DVB-H is RS coded to the link layer separately from the channel code applied to the physical layer to enhance the compensating ability of the channel distortion appearing in the mobile channel.
  • Reed-Solomon Codes may be configured as one Forward Error Correction (FEC) frame.
  • FIG. 2 is a block diagram illustrating a streaming server for reducing a channel change delay according to an embodiment of the present invention.
  • the streaming server 200 may include an encoder 210, a divider 220, a periodic data transmitter 230, and a stream transmitter 240.
  • the encoder 210 may classify and encode each of the plurality of channel data into base layer data and enhancement layer data. That is, the encoder 210 may encode the plurality of channel data into a plurality of layers including the base layer data and the enhancement layer data by using hierarchical coding according to importance.
  • the encoder 210 when the encoder 210 performs scalable video coding (SVC) encoding on each of a plurality of channel data, the encoder 210 considers at least one of data importance, data quality, frame rate, and screen size.
  • Channel data may be classified into base layer data and enhancement layer data and encoded. For example, the lowest layer may be used as the base layer, or only a part of the lowest layer may be used as the base layer data.
  • SVC scalable video coding
  • the encoder 210 may classify I frames as base layer data, and classify and encode remaining frames other than I frames as enhancement layer data.
  • burst data included in one time slice includes multiple GOPs (Group of Pictures)
  • all I frames of each GOP may be included as base layer data, and only the last I frame may be set as base layer data. It may be.
  • the last I frame is set as the base layer data
  • video of normal quality may be played.
  • classifying data by applying a data partitioning method provided by MPEG-2 only important data among the separated data may be set as base layer data.
  • the receiving terminal can decode only the base layer data to reproduce low quality video, or add and decode enhanced layer data to reproduce high quality video.
  • the divider 220 may divide the encoded data for each channel in time slice units. In this case, the dividing unit 220 may divide the size of each time slice to be the same. In addition, the dividing unit 220 may divide the size of each time slice so that the size of each time slice is differentiated according to the stream characteristics of the data for each channel.
  • the stream characteristics may include at least one of resource amount and quality required for each stream.
  • the periodic data transmitter 230 may transmit time slice period data for each channel.
  • the base layer data may be inserted and transmitted in the time slice of another channel in order to be able to show the new channel contents at the minimum image quality instead of the dark screen while waiting for the next time slice period.
  • the stream transmitter 240 may transmit data divided into time slices according to a preset time.
  • the stream transmitter 240 may include a main stream transmitter 241 and a preview stream transmitter 242.
  • the main stream transmitter 241 may transmit a main stream including base layer data and enhancement layer data for each channel.
  • the main stream transmitter 241 transmits base layer data and enhancement layer data collected during N time slice sections for each channel during the time slice section for each channel. Can be. For example, when the total number of channels is three, base layer data and extension data of each channel collected during three time slice periods T1 + T2 + T3 may be transmitted as a main stream.
  • the preview stream transmitter 242 may transmit a preview stream including base layer data for all channels.
  • the preview stream transmitter 242 may collect all or part of the base layer data for all the channels and transmit the data in every time slice period. For example, when all channels are composed of a first channel, a second channel, and a third channel, the base layer data of each channel during three time slice intervals are collected to generate a preview stream, and each time Each slice section can be transmitted. In addition, only a part of the base layer data of each channel during the three time slice intervals may be selectively extracted, re-collected to generate a preview stream, and may be transmitted for each time slice interval.
  • the stream transmitter 240 may transmit transmission time information for each time slice to the base station so that time slices of the plurality of streaming channels may be sequentially transmitted.
  • the base station may wirelessly broadcast the time slice data according to the specified time information, and the mobile station receives the burst data according to the time slice period allocated to the stream to be received, stores the data in an internal buffer memory, and decodes the data. You can play the video.
  • FIG. 3 is a block diagram illustrating a mobile terminal for reducing a channel change delay according to an embodiment of the present invention.
  • the mobile terminal 300 may include a periodic data receiver 310, a channel selector 320, a channel data receiver 340, a channel manager 330, and an output 350. .
  • the periodic data receiver 310 may receive time slice period data for each channel. That is, when transmitting and receiving data in a time slicing manner, a period for receiving data for each channel may be determined, and a time slice period for each channel may be transmitted to the mobile terminal in advance, thereby facilitating data reception.
  • the channel selector 320 may select a viewing channel and set a reception period for receiving data of the selected viewing channel. That is, when the viewing channel is selected, since the reception period for receiving data is different according to the viewing channel, a reception period corresponding to the selected viewing channel can be set. In this case, the reception period setting may be performed by referring to the time slice period data for each channel received above.
  • the channel selector 320 may output at least one of a screen of all channels using the base layer data and a current channel screen using the enhancement layer data to select a channel. That is, when the user wants to select a change channel, the user may select a channel to be changed from one of the preview image of each channel and the main image of the current channel by using the base layer data of each channel.
  • the channel data receiver 340 may receive main stream data and preview stream data of the selected viewing channel at each reception period.
  • the main stream data may include enhancement layer data and base layer data for each channel
  • the preview stream data may include all or part of the base layer data for all channels.
  • the channel data receiver 340 may include a power manager 341, a hierarchy classifier 342, and an internal memory 343.
  • the power manager 341 may switch the data receiving module to the active mode when the reception period is reached, and may switch the data receiving module to the sleep mode if it does not correspond to the set period. That is, when not receiving data for power saving, the sleep mode may be used to reduce unnecessary power waste.
  • the layer classifier 342 may classify the received main stream data and the preview stream data into enhancement layer data and base layer data. That is, data included in the main stream data and the preview stream data may be classified and classified into enhancement layer data and base layer data.
  • the internal memory 343 may store classified data.
  • the classified enhancement layer data and the base layer data may be divided and stored.
  • the channel data receiver 340 may receive only the main stream data. That is, while continuously receiving a channel without requesting a channel change, the preview stream for responding to the channel zapping delay is not received, thereby efficiently using resources for data reception.
  • the channel data receiving unit 340 may additionally receive only the preview stream data when the channel change request is continuously requested more than a predetermined number of times. That is, the existing preview stream data stored in the internal memory is repeatedly used during continuous channel change, thereby improving the phenomenon in which the preview stream screen different from the real-time broadcasting content at the present time is repeatedly displayed. Accordingly, new preview stream data may be additionally received to continuously update and provide a real-time preview screen as close as possible to the current time point.
  • the channel manager 330 may change the received channel data according to the channel change request.
  • the output unit 350 may output a screen based on the received data.
  • the output unit 350 may output a screen using the base layer data of the change channel included in the preview stream. That is, in order to receive burst data for the change channel, it is necessary to wait for the next time slice period allocated to the change channel. Therefore, if a dark screen is output during the wait time, a channel zapping delay may occur. Therefore, during the waiting time, the channel to be changed may be broadcasted in advance by using the base layer data of the change channel included in the preview stream.
  • the output unit 350 may output a screen using both the enhancement layer data and the base layer data, and thereby output a higher quality image.
  • FIG. 4 is a diagram illustrating a process of configuring a main stream and a preview stream according to an embodiment of the present invention.
  • FIG. 4 a process of arranging n audio or video streams 401, 402, 403 by time division multiplexing into n time slices is disclosed.
  • n is 3. That is, streams of each channel may be collected for three time slice times (T1 + T2 + T3) and arranged so that they can be sequentially burst transmitted at the corresponding time slice time.
  • the first stream 401 data collected for T1 + T2 + T3 time is transmitted during the T1 interval, which is the first time slice 406, and the second stream 402 collected for T1 + T2 + T3 time.
  • the data is transmitted during the T2 period, which is the second time slice 407, and the third stream 403 data collected during the T1 + T2 + T3 time are arranged to be burst transmitted during the T3 period, which is the third time slice 408.
  • a main stream composed of a time slice having a structure as shown at 404 can be transmitted. Therefore, a plurality of streams arranged in succession may be discontinuously transmitted by being divided into time slices multiplexed by time intervals.
  • the preview stream 405 may be configured by collecting only the base layer data 410, 411, and 412 of the video streams 401, 402, and 403 separately from the above.
  • the method of configuring the preview stream 405 may include collecting all base layer data collected during each time slice interval, repeatedly copying and inserting the base layer data in a corresponding time slice interval, or performing a base layer during a time corresponding to n time slices. Some data may be extracted, collected again, and replicated and inserted into n time slices repeatedly.
  • the data of the T1 section 406 of the preview stream 405 may include the T1 section base layer data 410 of the first stream 401, and the T1 section base layer data 411 of the second stream 402. In this case, all or part of the T1 section base layer data 412 of the third stream 403 may be collected.
  • the T1 section 406 data of the preview stream 405 is based on the T1 + T2 + T3 section basic layer data 410 of the first stream 401 and the T1 + T2 + T3 section basis of the second stream 402.
  • the hierarchical data 411 and all or part of the T1 + T2 + T3 section basic layer data 412 of the third stream 403 are collected, and are re-aggregated to the T1 section and the T2, T3 section of the preview stream.
  • Each can be duplicated and placed.
  • each time slice of the preview stream 405 may include base layer data corresponding to all streaming channels.
  • FIG. 5 is a diagram illustrating a process of configuring a main stream according to an embodiment of the present invention.
  • FIG. 5 an example of collecting n audio or video streams 501, 502, and 503 for a predetermined time and arranging them in n time slices in a time division multiplexing method is shown.
  • stream data may be collected for a certain period from a time slice start point allocated to each of the n streams to be multiplexed and arranged in a corresponding time slice.
  • the first stream 503 data collected for T1 + T2 + T3 time is placed at T4 interval time, which is the fourth time slice 508, and the second stream 502 collected for T2 + T3 + T4 time.
  • Data is placed in the T5 interval time, which is the fifth time slice 509, and the third stream 501 data collected during the T3 + T4 + T5 time may be transmitted in the T6 interval time, which is the sixth time slice 510. Place it. Therefore, it is possible to improve the delay time when the data of each stream is collected in the buffer and to improve the time difference phenomenon in which the scene broadcast in real time is delayed.
  • FIG. 6 is a diagram illustrating a process of configuring time slices having different time interval lengths according to one embodiment of the present invention.
  • the length of the time slice interval may be configured as a time interval having a differential length according to stream characteristics such as resource amount and quality required for each media stream such as a video stream, an audio stream, and a text stream.
  • FIG. 7 is a diagram illustrating a streaming method for reducing channel change delay according to one embodiment of the present invention.
  • each of the plurality of channel data may be classified into base layer data and enhancement layer data and encoded.
  • step 710 when performing a single stream encoding on each of the plurality of channel data, classifying an I frame as the base layer data, classifying the remaining frames except the I frame as the enhancement layer data; and The method may include encoding the classified base layer data and enhancement layer data.
  • SVC scalable video coding
  • the hierarchically encoded data for each channel may be divided into time slice units, and in operation 730, time slice period data for each channel may be transmitted.
  • data divided into time slices may be transmitted at a predetermined time.
  • a main stream including base layer data and enhancement layer data for each channel and a preview stream including base layer data for all channels may be transmitted for each time slice.
  • the main stream is a stream for transmitting base layer data and enhancement layer data collected during N time slice intervals for each channel, wherein N is the total number of channels, during the time slice intervals for the respective channels
  • the preview stream may refer to a stream which collects all or part of the base layer data for all channels and transmits the data in every time slice period.
  • FIG. 8 is a diagram illustrating a streaming method for reducing a channel change delay according to another embodiment of the present invention.
  • the mobile terminal may receive a time slice period table for each channel. That is, the time slice period table allocated to each streaming channel may be received from the base station and stored in the internal memory.
  • a channel to be watched may be selected and a data reception period may be set for the selected channel. That is, when the user selects a specific channel, the mobile terminal can set the reception period of the selected channel based on the stored time slice period table.
  • step 803 it is determined whether the data reception period for the set channel has been reached.
  • step 804 when the data reception period has been reached, the power of the data reception module may be turned on. At this time, if the channel reception period has not yet reached, it may be determined whether there is a channel change request.
  • data for the set channel may be received and buffered for the received data.
  • the received data may include main stream data and preview stream data.
  • data reception may be terminated and the data receiving module may be powered off. That is, in order to save power, when the reception is finished, the reception module may be powered off and enter the sleep mode.
  • data of the selected channel may be decoded to output the broadcast of the selected channel.
  • step 808 it is determined whether there is a channel change request.
  • step 809 when there is a channel change request, base layer data of a channel selected for change may be fetched from the internal memory.
  • the extracted base layer data may be decoded and displayed, and in operation 811, a data reception period for the changed channel may be set.
  • FIGS. 1 to 6 may be referred to.
  • the channel change delay can be reduced by immediately displaying the base layer data of the channel selected to be changed.
  • Embodiments of the present invention may be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium.
  • the computer readable medium may include program instructions, data files, data structures, etc. alone or in combination.
  • Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts.
  • Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks.
  • program instructions include machine code, such as produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like.
  • the hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

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

Abstract

L'invention concerne un procédé et un dispositif pour réduire un retard de changement de canal. Dans ce procédé, des données de couche de base au format de tranche de temps sont transmises avec chaque salve, et les données de couche de base du canal de commutation sont délivrées pendant un changement de canal.
PCT/KR2010/003612 2009-06-05 2010-06-04 Serveur de flux continu et terminal mobile pour réduire un retard de changement de canal, et procédé pour ce serveur et ce terminal Ceased WO2010140867A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/254,534 US8650592B2 (en) 2009-06-05 2010-06-04 Streaming server and mobile terminal for reducing channel-changing delay, and a method therefor

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20090049819 2009-06-05
KR10-2009-0049819 2009-06-05
KR1020100052320A KR20100131365A (ko) 2009-06-05 2010-06-03 채널 변경 지연을 줄이기 위한 스트리밍 서버, 이동 단말기 및 그 방법
KR10-2010-0052320 2010-06-03

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WO2010140867A2 true WO2010140867A2 (fr) 2010-12-09
WO2010140867A3 WO2010140867A3 (fr) 2011-03-17

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2562243A (en) * 2017-05-08 2018-11-14 V Nova Int Ltd Channel switching
CN109257623A (zh) * 2012-10-02 2019-01-22 杜比国际公司 发信号通知步进式时间子层访问样本的方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7958532B2 (en) * 2001-06-18 2011-06-07 At&T Intellectual Property Ii, L.P. Method of transmitting layered video-coded information
KR20040071984A (ko) * 2003-02-07 2004-08-16 엘지전자 주식회사 비디오 인코딩/디코딩 방법 및 장치
KR101456002B1 (ko) * 2007-06-26 2014-11-03 엘지전자 주식회사 디지털 방송 시스템 및 데이터 처리 방법

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109257623A (zh) * 2012-10-02 2019-01-22 杜比国际公司 发信号通知步进式时间子层访问样本的方法
CN109257623B (zh) * 2012-10-02 2021-02-12 杜比国际公司 用于解码图片的方法以及用于解码图片的电子设备
US11871014B2 (en) 2012-10-02 2024-01-09 Dolby International Ab Method for signaling a step-wise temporal sub-layer access sample
US12219161B2 (en) 2012-10-02 2025-02-04 Dolby International Ab Method for signaling a step-wise temporal sub-layer access sample
GB2562243A (en) * 2017-05-08 2018-11-14 V Nova Int Ltd Channel switching
GB2562243B (en) * 2017-05-08 2022-02-09 V Nova Int Ltd Channel switching

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