WO2007066257A1 - Donnees en continu via une liaison sans fil - Google Patents

Donnees en continu via une liaison sans fil Download PDF

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Publication number
WO2007066257A1
WO2007066257A1 PCT/IB2006/054498 IB2006054498W WO2007066257A1 WO 2007066257 A1 WO2007066257 A1 WO 2007066257A1 IB 2006054498 W IB2006054498 W IB 2006054498W WO 2007066257 A1 WO2007066257 A1 WO 2007066257A1
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WO
WIPO (PCT)
Prior art keywords
data
transfer
operable
protocol
multimedia
Prior art date
Application number
PCT/IB2006/054498
Other languages
English (en)
Inventor
Ozcan Mesut
Jozef P. Van Gassel
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2007066257A1 publication Critical patent/WO2007066257A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/26—Flow control; Congestion control using explicit feedback to the source, e.g. choke packets
    • H04L47/266—Stopping or restarting the source, e.g. X-on or X-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/29—Flow control; Congestion control using a combination of thresholds
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/30—Flow control; Congestion control in combination with information about buffer occupancy at either end or at transit nodes
    • 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
    • H04L65/65—Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to streaming data over a wireless link, and in particular, but not exclusively, to streaming of multimedia content.
  • a wireless network interface is a major energy consumer in a mobile multimedia device, especially when the interface is active and transferring data.
  • a mobile device could be used, for example, for receiving audio and/or video streams from a media server or for streaming audio/video (A/V) to a media renderer.
  • HTTP Hyper Text Transfer Protocol
  • RTP Real-time Transport Protocol
  • HTTP is usually used for web browsing, where the client pulls data from a server.
  • RTP can be described as a push protocol, where data, usually audio visual (A/V) data, is transmitted in packets at a certain rate from a server to a user device.
  • RTP has better real-time properties than HTTP and makes it possible to multicast a stream to a multiple number of clients without consuming more network bandwidth in a manner similar to broadcasting.
  • the wireless networking protocol used for streaming audio/video data over an IP network is IEEE 802.11.
  • Network controllers usually have a Power Save (PS) mode in which major functions are disabled most of the time so as to reduce power consumption.
  • PS Power Save
  • Beacon frames are transmitted by an Access Point (AP) or another device in the network at fixed intervals. They are used to keep the devices in the network synchronized and to announce any buffered frames for devices in the power save mode by means of traffic indication maps. If a device in power save mode detects that there is a buffered frame for it, then the device requests that frame by
  • AP Access Point
  • a station requesting a frame with a PS-Poll must stay awake until it is delivered. Under contention-based service, however, the access point can deliver a frame at any point. A station cannot return to the sleep mode until it receives a Beacon frame in which its bit in the traffic indication map is clear.
  • network controllers stay active for a while after receiving or transmitting a frame in power save mode also to maximize performance. If the interface would enter the sleep mode immediately after transmitting or receiving a frame in the power save mode, the maximum data rate of the interface in power save mode would drop dramatically during bulk transfers. Staying in the active mode a little longer helps to maximize data rate when the interface doesn't know when the next frame will arrive.
  • Embodiments of the present invention therefore, provide techniques for reducing power consumption in mobile multimedia servers/renderers.
  • a data transfer device comprising a data reception device operable to receive multimedia data, to store such received multimedia data, and to transfer stored multimedia data to a processing device, wherein the data reception device includes a data buffer for storing data and is operable to receive data in a contiguous data transfer burst sufficient to fill the data buffer to a first predetermined amount, such a data transfer burst being initiated when the data buffer stores less than a second predetermined amount of data, and wherein the data reception device is operable to transfer data using a data streaming protocol.
  • a device according to claim 1 can have reduced power consumption, by reducing the number of transitions between active and power save modes.
  • the data reception device is operable to request and transfer data using HyperText Transfer Protocol (HTTP).
  • HTTP HyperText Transfer Protocol
  • the data reception device is operable to request and control data transfer using Universal Plug and Play (UPnP) protocol, and to transfer requested data using Real-Time Transport Protocol (RTP).
  • UFP Universal Plug and Play
  • RTP Real-Time Transport Protocol
  • the data reception device is operable to request and control data transfer using Real-time Streaming Protocol (RTSP), and to transfer requested data using Real-Time Transport Protocol (RTP).
  • RTSP Real-time Streaming Protocol
  • the reception device may be operable to request transmission of data when an amount of data stored in the data buffer is less than a second predetermined amount.
  • the device may further comprise a wireless network interface for receiving data via a wireless communications link.
  • Another aspect of the present invention provides a mobile multimedia device comprising a processing device operable to process multimedia data, and a data transfer device according to the first aspect of the invention.
  • Another aspect of the present invention provides a multimedia server device comprising a processing device operable to process multimedia data, and a data transfer device according to the first aspect of the invention.
  • a method for transferring data to a mobile multimedia device which includes a processing device operable to process multimedia data, and a data reception device operable to receive multimedia data, to store such received multimedia data, and to transfer stored multimedia data to the processing device, the method comprising the steps of:
  • data transfer is performed using a streaming protocol.
  • Embodiments of the present invention are thus able to reduce power consumption in wireless devices, by enabling fewer transitions between the power save and active modes of the device.
  • Fig. 1 illustrates a wireless system incorporating mobile and stationary media servers/renderers
  • Fig. 2 is a block diagram illustrating one aspect of the present invention
  • Fig. 3 is a flow chart illustrating another aspect of the present invention
  • Fig. 4 shows power consumption graphs.
  • Figure 1 shows a mobile multimedia device 2 and a home media server 6 connected to a wireless Access Point (AP) 4 via a wireless link 3 and a wired link 5, respectively.
  • the home media server 6 may be connected in a wired or wireless manner to the access point 4.
  • the mobile device 2 can act as a media server and/or client/renderer. It is also possible that the mobile device connects wirelessly to the home server 6 or another mobile device in an ad-hoc manner without needing an access point.
  • a simplified schematic block diagram of a Client/Server arrangement is depicted in Figure 2.
  • the mobile media device 2 comprises a client device 21, a data buffer 22, and a codec device 23.
  • the home server 6 includes a server device 61 and a storage device (HDD) 62.
  • the server device 61 is a server device 61 and a storage device (HDD) 62.
  • the wireless link 3 may include an access point, or may be a peer-to-peer ad hoc link.
  • data packets are transferred from the server device 61 to the client device 21 in a contiguous burst that is sufficient to fill the data buffer 22.
  • the received data packets are then temporarily stored in the data buffer 22 until required by the codec device 23.
  • Data to be transmitted from the server 61 is cached until transmission is required, as will be described below.
  • FIG. 3 is a flow chart illustrating steps in a method embodying one aspect of the present invention.
  • Data packets are transferred to the client device 21 when the filling of the buffer 22 is below a certain threshold L (low-water mark), and so a check is made at step A to determine whether this is the case.
  • L low-water mark
  • the low-water mark L should be large enough to cover any latency in the network and the server in order to make sure that the buffer never gets empty. An empty buffer during playback may cause frozen video on a screen.
  • the server device 61 is instructed by the client to transfer data packets to the client device 21, and hence to the data buffer 22 (step B).
  • the data is transferred in a contiguous burst, so that the receiving device does not enter the power save mode during transfer of this data.
  • the server device 61 is instructed by the client to end data transfer (step D). The process then repeats, awaiting the filling of the data buffer 22 to hit the low- water mark L.
  • data packets are transferred from the Server 6 to the Client 2 in one contiguous burst and are buffered at the client device 2.
  • the buffered data packets are consumed at the stream bit rate by the codec 23.
  • the data buffer 22 is filled as fast as possible and when full data transfer is stopped until the buffer filling hits a certain low- water mark. Then the buffer is refilled.
  • the filling of the buffer 22 in one contiguous burst means that the number of transitions between the power save and active modes can be minimized, thus saving energy.
  • Data packets are transferred from the server device 61 to the client device 21 at a rate higher than the stream bit rate of the codec device 23.
  • the sending of data packets in high rate bursts means that the client device is able to enter the power save mode for a significant period of time, and the number of transitions between modes can be reduced. Hence, the average power consumption can be reduced, as will be shown with reference to Figure 4.
  • the data transfer is performed using a suitable streaming protocol or combination of protocols.
  • HTTP HyperText Transfer Protocol
  • UFP Universal Plug and Play
  • RTSP Real-time Streaming Protocol
  • RTP Real-Time Transport Protocol
  • the power consumption of a wireless PC card during 1.7 Mb/s video playback is shown in Figure 4.
  • the default behavior is shown in Figure 4a, where data is transferred at the stream bit rate. Although only a small part of the bandwidth is used, the idle time between the data packets is not sufficiently long for the wireless card to enter the PS mode.
  • Figure 4b the power consumption during playback via a 1 MB buffer with burst refilling is shown. The power consumption is 36% reduced from 1.1 W to 0.7 W. The power reduction depends on the characteristics of the network adapter, the stream bit rate and the buffer size.
  • the mobile device 2 When the mobile device 2 acts as a Client, it can playback A/V files energy- efficiently over a wireless link from standard servers using HTTP or RTP. Since the buffering scheme is implemented in the client device 21 and the client device 21 controls the server device 61.
  • HTTP is straightforward: the client device 21 issues a HTTP GET request to start a stream over a TCP link and reads data into a buffer from a TCP socket. When the data buffer is full reading from the socket is stopped until the filling of the buffer hits the low- water mark.
  • the TCP protocol takes care of stopping the server from transmitting data when data cannot be consumed by the client.
  • RTP additional control is required since RTP is a push protocol where the client device 21 has little or no control over the server device 61.
  • the server continuously transmits packets. If the client cannot keep up with the transmission rate then packets are dropped, resulting in hick- ups in the stream.
  • RTSP Real-Time Streaming Protocol
  • RTP Real-Time Streaming Protocol
  • RTSP packets are transmitted using either TCP or UDP. Data packets are transferred out-of- band, with respect to RTSP packets, using RTP.
  • RTSP is similar to HTTP in syntax and operation and supports the following methods: SETUP, PLAY, RECORD, PAUSE and TEARDOWN. The PLAY and the PAUSE methods are especially useful for the buffering scheme.
  • a Speed parameter can be specified. Using this parameter, the Client can request the server to deliver data at a particular speed, e.g. "Speed: 2.0" means data should be delivered at a rate twice the stream bit rate.
  • the buffer can be filled at high speed and when the buffer is full or nearly full the data transfer can be paused using the PAUSE method.
  • the buffer is nearly empty - buffer filling is below a low- water mark - the client resumes data transfer by using the PLAY method with the Speed option set.
  • Similar control can also be realized using another standard or a proprietary protocol.
  • the access point When a RTP server does not support RTSP or the RTSP Speed option or another RTSP-like control protocol, another way of realizing the low-power operation at the client device is to use a "power aware" Access Point.
  • Such an access point then implements the buffering scheme described in the previous paragraph. That is, the access point includes a data buffer for receiving, and storing temporarily, data from the server device. The access point then transfers the stored data to the client device on request/by agreement. The access point receives a data packet from the server device at the stream bit rate, buffers it internally then sends it to the client device in bursts. The Client and AP must of course communicate and agree for such a low-power streaming service for example using the UPnP protocol.
  • the device offering the low-power streaming service does not need to be an Access Point. It may also be another type of device on the network that offers such a service.
  • the mobile device acts as a media server
  • the client device is not "power-aware”
  • the only way to have the low-power operation at the server device is to use an intermediary device, such as an access point, that offers the low-power service mentioned above.
  • the applications of the invention include battery-powered devices that have wireless networking capabilities, and embodiments are especially suitable to mobile audio/video jukeboxes with streaming capabilities over an IEEE 802.11.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un dispositif de transfert de données comprend un dispositif de réception de données permettant de recevoir des données multimédia, de stocker les données multimédia reçues et de transférer les données multimédia stockées vers un dispositif de traitement. Ce dispositif de réception de données comprend un tampon de données destiné à stocker des données et permettant de recevoir des données dans une rafale de transfert de données unique suffisante pour remplir le tampon de données d'une première quantité prédéterminée, cette rafale de transfert de données étant lancée lorsque le tampon de données stocke moins qu'une deuxième quantité prédéterminée de données. Ce dispositif de réception de données permet de demander et de transférer des données au moyen du protocole de transfert hypertexte (HTTP) ou ce dispositif de réception de données permet de demander et de commander un transfert de données au moyen d'un protocole de flux en temps réel (RTSP) et de transférer les données demander au moyen d'un protocole de transports en temps réel (RTP).
PCT/IB2006/054498 2005-12-05 2006-11-29 Donnees en continu via une liaison sans fil WO2007066257A1 (fr)

Applications Claiming Priority (2)

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EP05111688.7 2005-12-05
EP05111688 2005-12-05

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120258699A1 (en) * 2011-04-05 2012-10-11 Samsung Electronics Co. Ltd. Method for operating portable terminal to reduce power during support of communication service and portable terminal supporting the same
US8768924B2 (en) 2011-11-08 2014-07-01 Adobe Systems Incorporated Conflict resolution in a media editing system
US8898253B2 (en) 2011-11-08 2014-11-25 Adobe Systems Incorporated Provision of media from a device
US9288248B2 (en) 2011-11-08 2016-03-15 Adobe Systems Incorporated Media system with local or remote rendering
US9373358B2 (en) 2011-11-08 2016-06-21 Adobe Systems Incorporated Collaborative media editing system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004093452A2 (fr) * 2003-04-17 2004-10-28 Thomson Licensing Dispositif de demande et de transmission de donnees et procedes et produits correspondants
US20050267946A1 (en) * 2004-05-03 2005-12-01 Samsung Electronics Co., Ltd. Method, media renderer and media source for controlling content over network

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004093452A2 (fr) * 2003-04-17 2004-10-28 Thomson Licensing Dispositif de demande et de transmission de donnees et procedes et produits correspondants
US20050267946A1 (en) * 2004-05-03 2005-12-01 Samsung Electronics Co., Ltd. Method, media renderer and media source for controlling content over network

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120258699A1 (en) * 2011-04-05 2012-10-11 Samsung Electronics Co. Ltd. Method for operating portable terminal to reduce power during support of communication service and portable terminal supporting the same
CN102843756A (zh) * 2011-04-05 2012-12-26 三星电子株式会社 操作便携式终端的方法和支持该方法的便携式终端
US8655338B2 (en) * 2011-04-05 2014-02-18 Samsung Electronics Co., Ltd. Method for operating portable terminal to reduce power during support of communication service and portable terminal supporting the same
US9144014B2 (en) 2011-04-05 2015-09-22 Samsung Electronics Co., Ltd. Method for operating portable terminal to reduce power during support of communication service and portable terminal supporting the same
CN102843756B (zh) * 2011-04-05 2017-03-01 三星电子株式会社 操作便携式终端的方法和支持该方法的便携式终端
EP2509369A3 (fr) * 2011-04-05 2017-03-15 Samsung Electronics Co., Ltd. Procédé de fonctionnement d'un terminal portable pour réduire la puissance pendant le support de service de communication et terminal portable prenant en charge ce procédé
KR101818577B1 (ko) * 2011-04-05 2018-01-15 삼성전자 주식회사 통신 서비스 지원 중 전원 절약을 위한 휴대 단말기 운용 방법 및 이를 지원하는 휴대 단말기
US8768924B2 (en) 2011-11-08 2014-07-01 Adobe Systems Incorporated Conflict resolution in a media editing system
US8898253B2 (en) 2011-11-08 2014-11-25 Adobe Systems Incorporated Provision of media from a device
US9288248B2 (en) 2011-11-08 2016-03-15 Adobe Systems Incorporated Media system with local or remote rendering
US9373358B2 (en) 2011-11-08 2016-06-21 Adobe Systems Incorporated Collaborative media editing system

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