WO2009034512A2 - Référencement des objets de notification hors bande dans un système dvb-ipdc - Google Patents

Référencement des objets de notification hors bande dans un système dvb-ipdc Download PDF

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Publication number
WO2009034512A2
WO2009034512A2 PCT/IB2008/053620 IB2008053620W WO2009034512A2 WO 2009034512 A2 WO2009034512 A2 WO 2009034512A2 IB 2008053620 W IB2008053620 W IB 2008053620W WO 2009034512 A2 WO2009034512 A2 WO 2009034512A2
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WO
WIPO (PCT)
Prior art keywords
notification
mapping data
band
terminal
data object
Prior art date
Application number
PCT/IB2008/053620
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English (en)
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WO2009034512A3 (fr
Inventor
Jozef P. Van Gassel
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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 WO2009034512A2 publication Critical patent/WO2009034512A2/fr
Publication of WO2009034512A3 publication Critical patent/WO2009034512A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/86—Arrangements characterised by the broadcast information itself
    • H04H20/93—Arrangements characterised by the broadcast information itself which locates resources of other pieces of information, e.g. URL [Uniform Resource Locator]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/57—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for mobile receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/40—Aspects of broadcast communication characterised in that additional data relating to the broadcast data are available via a different channel than the broadcast channel

Definitions

  • This invention relates to Digital Video Broadcasting - Internet Protocol Datacast (DVB-IPDC).
  • DVD-IPDC Digital Video Broadcasting - Internet Protocol Datacast
  • Digital Video Broadcasting for IP Datacasting defines a set of systems layer specifications for DVB mobile TV systems.
  • DVB-IPDC can be applied to Digital Video Broadcasting for Handheld Terminals (DVB-H), which is an emerging standard for delivering digital TV to handheld devices such as mobile telephones and Personal Digital Assistants (PDAs).
  • DVD-H Digital Video Broadcasting for Handheld Terminals
  • PDAs Personal Digital Assistants
  • DVB-IPDC One aspect of DVB-IPDC is Notification.
  • a Notification is used by the network to provide information about forthcoming events. These events can be related to services and contain information which is delivered from the network to the terminal (or end- user). Examples of Notification services are score updates in sports broadcasts, stock tickers and news services. Notifications are not necessarily user-oriented. Examples of system- oriented notifications are, for example, signalling of important software updates or changes in the Electronic Service Guide (ESG).
  • ESG Electronic Service Guide
  • Notification messages can take the form of a first message part, called a notification trigger message, which carries a reference to a second message part.
  • the second message part comprises a notification payload and is transmitted out-of-band.
  • "Out-of-band" generally means some other transport location other than the first message part such as, for example, a different file delivery session. This is particularly useful where the payload is large, such as a large file, e.g. a software update.
  • each instance of a Notification occupies as little of the transmission bandwidth as possible, especially as Notifications may need to be transmitted multiple times.
  • Notifications may need to be sent multiple times.
  • a broadcast network lacks a return channel, and therefore lacks a mechanism to ensure all terminals receive the Notification, it is advisable to send each Notification multiple times.
  • an object referred to which a Notification relates may have a sequence of phases (a life cycle) which individually need to be notified to terminals.
  • the present invention seeks to provide a more efficient way of delivering Notification messages and, in particular, a more efficient way of delivering Notification messages which refer to out-of-band Notification objects.
  • a first aspect of the present invention provides a method of transmitting Notifications in a Digital Video Broadcasting - Internet Protocol Datacast (DVB-IPDC) system, comprising: transmitting a Notification message which carries an indirect reference to a location of an out-of-band Notification data object; transmitting the out-of-band Notification data object; and, transmitting mapping data which a terminal can use to map the indirect reference to the location from which the out-of-band Notification data object can be retrieved.
  • DVD-IPDC Digital Video Broadcasting - Internet Protocol Datacast
  • An advantage of this aspect of the invention is that the indirect reference carried within the Notification message can be of a relatively small size, and certainly much smaller than a direct reference to the location of the notification data object, such as a full Session Description Protocol (SDP) description which would typically amount to 500 bytes in size.
  • SDP Session Description Protocol
  • This can provide a large increase in Notification message overhead efficiency and a large reduction in bandwidth used by the Notification messages, especially when it is considered how each Notification message may be transmitted multiple times.
  • Minimising the size of each Notification message also helps to avoid the risk of exceeding the Maximum Transmission Unit (MTU) size of packets, which avoids the need to perform fragmentation at some level in the protocol stack.
  • MTU Maximum Transmission Unit
  • the out-of-band Notification data object is carried within a transmission session
  • the indirect reference comprises a Uniform Resource Identifier
  • the mapping data comprises a mapping between the Uniform Resource Identifier carried within the Notification message and a Session Description Protocol file which identifies the transmission session.
  • the out-of-band Notification data object is carried within a transmission session and the Notification message further carries an object-identifying reference, such as a Uniform Resource Identifier, to identify the out-of-band Notification data object within the transmission session.
  • the mapping data can be made available to terminals in various ways. A particularly advantageous way of making the mapping data available is by transmitting the mapping data in a manner which identifies the mapping data as being data which needs to be loaded as part of a bootstrapping process of the terminal, or some other start-up process. This can be achieved by selection of an appropriate descriptor, and the level at which this descriptor is introduced.
  • a common set of mapping data can be transmitted across an Internet Protocol (IP) platform or a set of (different) mapping data can be transmitted for each Electronic Service Guide provider. This can be achieved by selection of an appropriate descriptor, and the level at which this descriptor is introduced. Preferably there is a substantially static mapping between Notification messages and out-of-band storage locations of Notification data objects, even though the content of Notifications will change dynamically. This can help to ensure that the mapping data need only be retrieved by a terminal on an infrequent basis, such as once upon each start-up, which helps to save energy resources at the terminal.
  • a further aspect of the invention provide a network entity arranged to perform any of the steps of this method.
  • a further aspect of the invention provides a method of processing Notification objects at a terminal in a Digital Video Broadcasting - Internet Protocol Datacast (DVB- IPDC) system, comprising: - receiving mapping data; receiving a Notification message which carries an indirect reference to a location of an out-of-band Notification object; using the mapping data to map the indirect reference in the Notification message to the location of the out-of-band Notification object; - receiving the out-of-band Notification object from the location indicated by the mapping data.
  • DVD- IPDC Digital Video Broadcasting - Internet Protocol Datacast
  • a further aspect of the invention provides a signal for transmission in a Digital Video Broadcasting - Internet Protocol Datacast (DVB-IPDC) system, comprising: a Notification message which carries an indirect reference to a location of an out-of-band notification data object; an out-of-band Notification data object; and, mapping data which a terminal can use to map the indirect reference to the location from which the out-of-band Notification data object can be retrieved.
  • DVD-IPDC Digital Video Broadcasting - Internet Protocol Datacast
  • the functionality described here can be implemented in software, hardware or a combination of these.
  • the invention can be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer.
  • ⁇ is intended to encompass any electronic processing apparatus which includes, but is not limited to, a microprocessor, a microcontroller, a programmable logic device, a ( re- )conf ⁇ gurable processing array, a programmable gate array and a digital signal processor.
  • a microprocessor a microcontroller
  • a programmable logic device a programmable logic device
  • a ( re- )conf ⁇ gurable processing array a programmable gate array
  • a digital signal processor e.g., a digital signal processor.
  • another aspect of the invention provides software for implementing the method.
  • the software may be stored on an electronic memory device, hard disk, optical disk or other machine-readable storage medium.
  • the software may be delivered as a computer program product on a machine-readable carrier or it may be downloaded to the terminal or network entity via a network connection.
  • the features of the present invention can be applied to Digital Video Broadcasting for IP Datacasting (DVB-IPDC) over Digital Video Broadcasting for Handheld Terminals (DVB-H), as well as other current and future DVB standards, such as DVB-SH.
  • DVD-IPDC Digital Video Broadcasting for IP Datacasting
  • DVD-H Digital Video Broadcasting for Handheld Terminals
  • DVB-SH other current and future DVB standards, such as DVB-SH.
  • Fig. 1 shows an embodiment of invention implemented in a DVB-H transmission system
  • Fig. 2 shows the process of mapping a reference in a Notification message to an out-of-band payload using a look-up table.
  • Figure 1 shows a generalised system for providing IP Datacast over a DVB-H transmission system, as described in ETSI TR 102 469 vl.1.1 (2006-05). Figure 1 also shows additional elements to perform the present invention.
  • a Service Application/Service Management entity 10 aggregates content from various content sources, such as audio, video and data content and generates IP packets carrying the various services which are to be offered to terminals. An Electronic Service Guide is created, based on metadata describing the content which is offered.
  • a broadcast network 20 includes a multi-protocol encapsulation (MPE) process which encapsulates the IP packets into MPE-sections. Forward error correction is applied to the MPE sections and MPE sections are assigned to time slices.
  • MPE multi-protocol encapsulation
  • the output of the IP-encapsulator 21 is applied to a DVB modulator 22, which applies Orthogonal Frequency Division Multiplexing (OFDM) to the data.
  • OFDM modulated data is wirelessly transmitted over a channel 30.
  • received signals are applied to a DVB-T demodulator 41 and a DVB-H IP-decapsulator 42.
  • DVB-H Digital Broadcast Services to Handheld Devices
  • a Notification message can be transmitted over a channel of the DVB system.
  • Notification messages can be one of two general types.
  • a first type of notification message is essentially self-contained, and carries a payload of data along with the notification message.
  • a notification message of a sports score can carry the text of the score as part of the notification message.
  • a second form of notification message comprises two parts.
  • a first message part, called a notification trigger message carries information about the notification and carries a reference to a second message part.
  • the second message part comprises a notification payload and is transmitted out-of-band.
  • Out-of-band generally means some other transport location such as, for example a different file delivery session.
  • This second type of notification is particularly useful where the payload is large, such as a notification message notifying a terminal of a software update.
  • This invention concerns notification messages of this second type.
  • the Service Application/Service Management entity 10 has a Notification generation function 11 which generates Notification messages. Notification messages may be generated in response to external events, such as sports scores, news stories, the availability of software updates and so on. Notification generation function 11 can create a two-part notification comprising a trigger Notification message and a payload which is to be associated with that Notification message.
  • a trigger Notification message includes a short reference - a Uniform Resource Identifier (URI) - which provides an indirect reference to the out-of-band location of the payload associated with the message.
  • the Service Application/Service Management entity 10 also has a function 12 which generates mapping data. The mapping data maps the relationship between the short reference (URI) carried within a message and the location of the payload.
  • the mapping data for multiple Notification messages can be sent together as a look-up table. An example of the look-up table can be illustrated as follows:
  • the indirect reference (URI) carried within the notification trigger message can be relatively short, whereas the full location of the out-of-band payload can be defined by a much longer reference (an SDP file) with no loss in bandwidth efficiency on the notification transport link.
  • mapping data is transmitted to broadcast network 20 for use by terminals 40.
  • a Notification processing function 43 extracts the mapping data 44 and stores the mapping data 44 locally at the terminal.
  • Notification processing function 43 also receives Notification messages and, when a trigger Notification message is received, uses the mapping data to determine the location of the out-of-band payload associated with the trigger Notification message.
  • Trigger Notification message 60 carries a short URI 61 which indirectly refers to the particular FLUTE session that carries the target out-of-band Notification object 65.
  • URI 61 is called an SDP URI as it refers to an entry in a table 44 which can resolve the URI to an SDP file which defines the FLUTE session.
  • Mapping data 44 stored at a terminal 40 defines a mapping between each SDP URI and the location of the FLUTE session which carries the out-of-band Notification object 65 corresponding to the Notification message.
  • SDP URI2 maps to SDP2, which identifies FLUTE SESSION 2 63.
  • Trigger Notification message 60 also carries a second URI 62 which points to an item within the FLUTE session 63. This second URI 62 is called an OBJ URI as it points to an object.
  • a FLUTE session carries a File Descriptor Table 64 which defines a mapping between Content-location URIs and Transport Object Identifiers (TOIs).
  • TOIs Transport Object Identifiers
  • the FDT is used to map the OBJ URI 62 to the particular TOI, and hence object, within the FLUTE session.
  • the FDT 64 of FLUTE SESSION 2 maps OBJJJRB to TOB, which is the target out-of-band object 65.
  • the FDT 64 for FLUTE- SESSION 2 is shown in more detail in the top right-hand corner of Figure 2.
  • the trigger Notification message 60 can be carried over FLUTE, Real-time Transport Protocol (RTP), or some other delivery mechanism.
  • the mapping data 44 is continuously broadcast as part of the filing carousel. This allows a terminal to quickly acquire the mapping data 44 upon start-up.
  • the Notification messages 60 can be broadcast as necessary, and the out-of-band Notification objects 65 can be repetitively broadcast as part of the FLUTE filing carousel. It is envisaged that the mapping data 44 will vary on a relatively slow timescale while the Notification messages and out-of-band Notification objects 65 can vary on a much shorter timescale.
  • mapping data For transmitting the mapping data, and for acquiring the mapping data at a terminal, are described in more detail below. It may be possible for a terminal to acquire the mapping data on a single occasion, at terminal start-up or even less frequently as part of a process of scanning for information about new services. This is because although Notifications may carry new data, a Service Provider/Service Management entity will typically define a particular place where each type of Notification message will be transmitted. For example, all two-part Notification messages concerning news items will store payloads at location ABC, all software updates will store payloads at location DEF. Thus, it can be seen that the mapping between a Notification message and an out-of-band payload is static, even though the contents of the message and payload are dynamic. Clearly, the less frequently that a terminal needs to acquire new mapping data, the more power efficient a terminal becomes.
  • One option for transmitting the mapping data is to carry the additional table (implicitly) by introducing a special SDP Notification Stream. Effectively, this is implemented using a regular FLUTE Session.
  • This SDP Stream can either be dedicated for this purpose or a FLUTE session can be used for other purposes as well (e.g. carrying ESG information).
  • the actual look-up mechanism can conveniently be achieved through use of the File Descriptor Table (FDT) of the FLUTE (RFC 3926) protocol as will now be explained.
  • FLUTE a File Descriptor Table (FDT) is used to provide a mapping between transport objects (i.e. files) and URIs which can be used to refer to the individual transport objects.
  • the FDT of a FLUTE stream is used to relate URIs to SDP files, so the Content-Location URIs of the FDT are the URIs 61 and the transport objects carried in the session are the actual SDP files.
  • a simple look-up mechanism is established by inspecting the FDT and resolving the location of the corresponding SDP information.
  • the referring Notification message 60 only needs to carry the short URI 61 instead of the relatively long content of the SDP file.
  • mapping data 44 There is a need to identify the location of this mapping data 44 to terminals.
  • the special FLUTE session which carries this mapping data should be discoverable during the bootstrapping process of the terminal.
  • special extensions to the bootstrap mechanism are proposed.
  • the main element describing the location of the special Notification SDP Stream may follow the following syntax.
  • IP Source address IP Destination address, port number and Transport Session Identifier (TSI) are sufficient to describe the location of such a special Notification SDP Session.
  • IPv4 or IPv6 addresses different numbers of bits are allocated for the IP addresses in the descriptor.
  • uimsbf unsigned integer, most significant bit first
  • bslbf bit string, left bit first.
  • NotificationSDPStreamEntry can be at two different levels: 1. At the IP Platform level, this is particularly useful if the Notification SDP
  • PDN Platform Default Notification
  • NotificationSDPStreamEntry can be achieved at a number of different levels of the Notification bootstrapping mechanism as it is currently defined in the draft specification (i.e. TM-CBM 1943r2):
  • Ib is the most preferable solution as it does not require a new descriptor and the Notification SDP Stream is defined at the global level, which is not the case for the ESG approach).
  • New top-level descriptor (option Ia)
  • a second Notif ⁇ cationSDPStreamDescriptor bootstrap descriptor is introduced specifically for providing access to the Notification SDP stream.
  • the syntax of this descriptor can be as follows:
  • Notification SDP Stream is defined at the XML level in the ESG Data Model. This can be achieved by extending the SessionDescription element which is a child element of the AcquisitionFragment element. In particular the
  • ComponentCharacteristic element can be extended to describe the Trigger Notification stream and the Notification Object (i.e. payload) stream.
  • the Notification SDP Stream can be global to the entire ESG and this would lead to repetition of the same information throughout the complete ESG for every Notification service. Defining it at the global ESG level would require a significant extension of the ESG Data Model.
  • Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practising the claimed invention, from a study of the drawings, the disclosure, and the appended claims.
  • the word “comprising” does not exclude other elements or steps
  • the indefinite article "a” or “an” does not exclude a plurality.
  • a single processor or other unit may fulfill the functions of several items recited in the claims.
  • the mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measured cannot be used to advantage. Any reference signs in the claims should not be construed as limiting the scope.

Abstract

La présente invention concerne un système de diffusion de données de protocole Internet de diffusion vidéo numérique (DVB-IPDC), un message de notification (60) achemine une référence indirecte (61) à un emplacement (63) d'un objet de données de notification hors bande (65). L'objet de données de notification hors bande (65) est transmis hors bande comme faisant partie d'une session de transmission (63). Les données de mappage (44) fournies peuvent être utilisées par un terminal en vue de mapper la référence indirecte (61) à l'emplacement (63) à partir duquel l'objet de données de notification hors bande (65) peut être récupéré. Le message de notification (60) achemine également une référence (62) qui identifie l'objet du transport particulier dans la session de transmission (65) qui transporte l'objet de données de notification hors bande (65). La référence indirecte (61) peut être d'une taille relativement petite, plus petite qu'une référence directe à l'emplacement (63) de l'objet de données de notification. Les données de mappage peuvent être transmises d'une manière qui les identifie comme étant des données nécessitant d'être chargées en tant qu'élément du processus d'amorçage du terminal.
PCT/IB2008/053620 2007-09-14 2008-09-08 Référencement des objets de notification hors bande dans un système dvb-ipdc WO2009034512A2 (fr)

Applications Claiming Priority (2)

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EP07116506 2007-09-14
EP07116506.2 2007-09-14

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WO2009034512A2 true WO2009034512A2 (fr) 2009-03-19
WO2009034512A3 WO2009034512A3 (fr) 2009-10-15

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130290794A1 (en) * 2010-04-23 2013-10-31 Ebay Inc. System and method for definition, creation, management, transmission, and monitoring of errors in soa environment
JP2014515586A (ja) * 2011-05-27 2014-06-30 クゥアルコム・インコーポレイテッド インターネットプロトコルマルチキャストコンテンツ配信のアプリケーショントランスポートレベルロケーションフィルタ処理

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007042886A2 (fr) * 2005-10-07 2007-04-19 Nokia Corporation Notification utilisee comme service ou comme acces de service
EP1811743A1 (fr) * 2006-01-20 2007-07-25 Sagem Communication S.A. Procédé de signalisation de services prioritaires et récepteur adapté à recevoir cette signalisation
EP1816766A2 (fr) * 2006-02-01 2007-08-08 Samsung Electronics Co., Ltd. Procédé et appareil de transmission et de réception de message de notification dans un système de diffusion mobile

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007042886A2 (fr) * 2005-10-07 2007-04-19 Nokia Corporation Notification utilisee comme service ou comme acces de service
EP1811743A1 (fr) * 2006-01-20 2007-07-25 Sagem Communication S.A. Procédé de signalisation de services prioritaires et récepteur adapté à recevoir cette signalisation
EP1816766A2 (fr) * 2006-02-01 2007-08-08 Samsung Electronics Co., Ltd. Procédé et appareil de transmission et de réception de message de notification dans un système de diffusion mobile

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130290794A1 (en) * 2010-04-23 2013-10-31 Ebay Inc. System and method for definition, creation, management, transmission, and monitoring of errors in soa environment
US9069665B2 (en) * 2010-04-23 2015-06-30 Ebay Inc. System and method for definition, creation, management, transmission, and monitoring of errors in SOA environment
JP2014515586A (ja) * 2011-05-27 2014-06-30 クゥアルコム・インコーポレイテッド インターネットプロトコルマルチキャストコンテンツ配信のアプリケーショントランスポートレベルロケーションフィルタ処理
US9451401B2 (en) 2011-05-27 2016-09-20 Qualcomm Incorporated Application transport level location filtering of internet protocol multicast content delivery

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