WO2023048590A1 - Système et procédé de génération de canal virtuel - Google Patents

Système et procédé de génération de canal virtuel Download PDF

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Publication number
WO2023048590A1
WO2023048590A1 PCT/RU2021/000621 RU2021000621W WO2023048590A1 WO 2023048590 A1 WO2023048590 A1 WO 2023048590A1 RU 2021000621 W RU2021000621 W RU 2021000621W WO 2023048590 A1 WO2023048590 A1 WO 2023048590A1
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Prior art keywords
virtual
channels
service
channel
virtual channel
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PCT/RU2021/000621
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English (en)
Russian (ru)
Inventor
Дина Анатольевна ГУРТОВАЯ
Дмитрий Геннадьевич РОЗОВ
Максим Станиславович САМСОНОВ
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Общество с ограниченной ответственностью "Цифра"
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Priority claimed from RU2021127614A external-priority patent/RU2781944C1/ru
Application filed by Общество с ограниченной ответственностью "Цифра" filed Critical Общество с ограниченной ответственностью "Цифра"
Publication of WO2023048590A1 publication Critical patent/WO2023048590A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/68—Systems specially adapted for using specific information, e.g. geographical or meteorological information
    • H04H60/72—Systems specially adapted for using specific information, e.g. geographical or meteorological information using electronic programme guides [EPG]
    • 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
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
    • 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
    • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/458—Scheduling content for creating a personalised stream, e.g. by combining a locally stored advertisement with an incoming stream; Updating operations, e.g. for OS modules ; time-related management operations

Definitions

  • the group of inventions relates to the field of satellite broadcasting and can be used in its organization and creation of dedicated "virtual" television channels.
  • Digital television systems are often characterized by the presence of a large number of mainly audiovisual channels, which the user can switch and display as desired (provided that he has the appropriate access rights to each channel). Therefore, the choice of a variety of materials that can be viewed at any time is very extensive, which provides the user with the opportunity to a certain extent to personalize television "for themselves.” However, for most users, keeping track of all the material offered, classifying it precisely according to their tastes, and scheduling ("programming") the output of programs of interest to them is either too difficult or not in line with their inclinations.
  • broadcast advertisements which are a significant (and often vital) source of income for a broadcaster, tend to be of interest to only a relatively small portion of television viewers.
  • targeted delivery of advertising materials to the appropriate target groups is often difficult (and in most conventional digital television systems is completely impossible) and inefficient.
  • US20060156341 discloses a device solution for generating a virtual channel, comprising a virtual channel setting module for setting any one channel of a plurality of channels as a virtual channel per user; and a virtual channel processing unit for registering a program selected by a user who has set the virtual channel in a list of programs associated with the virtual channel.
  • a virtual channel can be set for each user so that a program of every taste can be viewed, even if multiple users use the same TV, with minimal manual input required via the remote control or the TV's built-in selection buttons.
  • US20040205815 discloses a solution whereby, in an implementation, a virtual channel is associated with each of one or more recorded programs.
  • a virtual channel preview guide is generated to display various virtual channels and their associated recorded programs. When a virtual channel is selected, a preview of the recorded program associated with the virtual channel starts.
  • the virtual channel preview guide includes program identifiers each corresponding to a recorded program and includes virtual channel identifiers each associated with a different program identifier.
  • the VC Preview Guide also includes a selectable control, such as a program ID or VC ID, that can be selected to launch a preview of the recorded program.
  • the Virtual Channel Preview Guide includes a preview to display a preview of the recorded program.
  • the closest to the solution under study is the technology for forming user channels disclosed in patent publication US20090320072 (Microsoft Corporation, 2008).
  • the technology is a system and method for generating a virtual channel in an electronic program guide.
  • the scheduling commands which are user-configurable, specify the content to be presented for selection in the virtual channel. Scheduling instructions are executed in order of priority.
  • the virtual channel is populated with content descriptions based on the execution of scheduling instructions.
  • broadcast gaps are defined in the virtual channel.
  • each broadcast interval is populated with different content based on a broadcast interval setting set by the user.
  • each broadcast interval remains an empty schedule entry in the virtual channel.
  • the disadvantages of the above analogues and the prototype should include the need for the formation and use of a virtual channel to increase the used transponder capacity, organize the recording of the content of the virtual channel and the presence of an additional storage device for storing the recorded content, as well as the need for full descrambling of the content reproduced as part of the virtual channel , both within the virtual channel and outside it.
  • the known solutions are built, for the most part, based on the user's preferences, i.e. formed on the client device, which complicates the process of forming this kind of individual channel, and also reduces the protection of the recorded content.
  • the known solutions for organizing a virtual channel require significant complication of the broadcasting system while reducing the level of content protection and increasing the risk of providing unauthorized access to programs of linear broadcast channels.
  • the present invention is directed to eliminating the problems inherent in the prior art.
  • the technical result achieved by the claimed invention is the expansion of the operational capabilities of the broadcasting system, by expanding the capabilities of broadcasting content without increasing the transponder capacity and memory of the transmitting and client parts, while increasing the level of content protection
  • a virtual channel provision service system including a transmitting and receiving side, where the transmitting side includes at least an EPG server of an electronic television program guide, connected to each other and to the multiplexer, equipped with event scheduling tools.
  • content of linear broadcast channels and a CAS conditional access subsystem, including a conditional access server and an encrypting device, equipped with means for encrypting and providing access to the encrypted content of linear channels
  • the multiplexer is equipped with means for generating a transport stream, including at least the content of linear broadcast channels, schedule of content events, commands for accessing encrypted content
  • the receiving side includes a client device - a digital satellite receiver, equipped with means for receiving, processing transport stream data, and decrypting content, different based on the prototype in that it is additionally equipped with means for generating virtual channels of the service, moreover, the EPG server is additionally equipped with means for generating metadata of virtual channels, and schedules of virtual channels - in the form of a layout of a selection of content events of linear broadcast channels,
  • the EPG server is preferably equipped with means for generating two types of service virtual channel metadata: basic metadata and additional metadata, where - the main metadata is the schedule of each of the virtual channels with a directory of virtual channels, where the schedule for each of the virtual channels consists of events broadcast as part of the linear broadcast channels, marked in a predetermined way when forming a selection of virtual channel events.
  • additional metadata is graphical data, at least including a technological break banner set in pauses between adjacent broadcasts of virtual channel events, and a channel logo.
  • the main metadata of virtual channels contains event parameters, including description, start and end time of the event, parameters of the linear broadcast channel in the SNT transport stream on which the virtual channel event is broadcast, virtual channel identifier, and parameters of virtual channels, including the name of the virtual channel, position in the list of channels, links to each of the additional metadata files associated with the virtual channel.
  • the main virtual circuit service metadata may be generated for transmission as a data carousel stream, and additional metadata as an object carousel stream.
  • the main metadata of the virtual channels of the service can be made in the form of a JSON file, additional metadata in the form of an archive file containing graphic data files.
  • the CAS may be configured to encrypt content according to the DVB CSA algorithm.
  • a separate PID packet may be allocated within the transport stream to broadcast the primary and secondary metadata of the service's virtual channels.
  • the metadata of virtual channels is made with the possibility of broadcasting in one service on one transponder, with the possibility of detecting a service with metadata in the transport stream by means of service information with a link to the service with virtual channels metadata, which is the Linkage descriptor added in a table of network information of the NIT flow with the possibility of providing a service of virtual channels to the end user without a user feedback channel.
  • the Linkage descriptor overhead information includes at least the SNT virtual circuit metadata broadcast parameters, the virtual circuit metadata service identifier, and the virtual circuit metadata format version.
  • the transport stream at the output of the multiplexer is an MPEG-2 transport stream and includes at least: linear broadcast channels, the content of which is also used in the virtual channels; basic and additional metadata of the virtual channels service; linkage handle; MPEG-2 service tables of the transport stream, including: PMT program structure tables; CAT table of conditional access; NIT network information table; TDT date and time table; BAT table of program groups.
  • the client device is made in the form of a digital satellite receiver equipped with at least a tuner/demodulator that receives the MPEG-2 transport stream input signal, a cryptomodule designed to enable decoding of the incoming encrypted transport stream, while the cryptomodule is equipped with a sectional filter for commands to set virtual channel rights, an EMM type handler for messages corresponding to the virtual channel and the ability to send a command to set the rights and session keys of the virtual channel, as well as the main processor CPU, which processes data, providing the final to the user for audio-video output of the content of linear broadcast channels and virtual service channels in the user interface module.
  • the client device is made in the form of a digital satellite receiver equipped with at least a tuner/demodulator that receives an MPEG-2 transport stream input signal, a main processor CPU made with providing the ability to decrypt the incoming encrypted transport stream by means of the built-in security system, and carrying out data processing, providing the end user with audio-video output channel content in the user interface module, while the CPU is equipped with a sectional filter for virtual channel rights setting commands, an EMM message handler, corresponding to the virtual channel and the ability to send a command to set the rights and session keys of the virtual channel.
  • the claimed technical result is also achieved by using a method for providing a virtual channel service to an end user, which includes successive stages, at which at least:
  • the main and additional metadata are generated, where the main metadata of service virtual channels is a schedule of each of the virtual channels with a directory of virtual channels, and additional metadata is graphic data, according to at least including a technological break banner installed in the pauses between adjacent broadcasts of virtual channel events, and a channel logo.
  • the main and additional service virtual circuit metadata are formed into streams, where the main virtual circuit service metadata is formed as a data carousel stream and the additional metadata is formed as an object carousel stream.
  • additional service information is embedded in the transport stream subsequently transmitted to the input of the client device, which is a Linkage descriptor in the network information table (NIT), which provides dynamic discovery of the service metadata by the client device virtual channels in transport stream, and on the client device perform service discovery with metadata in the transport stream through the mentioned Linkage descriptor without a user feedback channel.
  • NIT network information table
  • the main processor requests the cryptomodule to decrypt the content event after automatically switching to the corresponding linear broadcast channel that broadcasts the event as part of the virtual channel of the service, and the cryptomodule initiates a call to the smart card or the built-in smart card emulator as part of the cryptomodule, to decrypt the control word for decrypting the content of the linear broadcast channel as part of the virtual channel, configures the elementary streams of the transport stream for the descrambler according to the information received from the main processor according to the information from the PMT service table to receive ECM messages, and sets the control words received from the smart card or the built-in smart card emulator to the descrambler.
  • decoding the corresponding content after automatic switching to a linear broadcast channel that broadcasts a content event as part of a virtual channel of the service setting the elementary streams of the transport stream for the descrambler in accordance with the information of the PMT service table to receive ECM messages and setting control words in the descrambler carried out by the main processor, configured to decrypt the incoming encrypted stream through the built-in security system.
  • the CPU of the digital satellite receiver in the virtual channel viewing mode, automatically switches on the broadcast of the content of the linear broadcast channel according to the schedule by switching to the linear broadcast channel according to the SNT parameters, if the current event is broadcast on the linear broadcast channel, or displays a banner, received as part of the virtual channel metadata, if the current event is a technological event.
  • FIG. 1 is a generalized diagram of a broadcast network
  • figure 2 an example of the formation of the schedule with the installation of a mark technological break: a) one virtual channel; b) two virtual channels
  • fig.3 is a diagram of the components and the process of ensuring content protection
  • Fig. 4 is a generalized diagram of a client device
  • 5 shows a metadata file discovery process
  • Fig.6 the operation of the service of virtual channels on the client device when interacting with the user
  • Fig.7 switching according to the schedule of the virtual channel.
  • the claimed group of inventions relates to the field of organizing satellite broadcasting, namely to a system and method for organizing a service for providing virtual, thematic channels to the end user.
  • ECM Entitlement Control Message
  • EMM Entitlement Management Message
  • ES Electronic Stream
  • Video data sound data, special data
  • MPEG Motion Pictures Expert Group
  • PID Packet Identifier
  • SAS Subscriber Authorization System
  • subscriber authorization system a system for granting authorization to a subscriber
  • SMS Subscriber Management System
  • subscriber administration (management) system
  • Access Criteria (AC) - information needed by the access right control message generator (ECMG) to generate an access right control message (ECM);
  • Multiplexer a device designed to combine several data streams of a digital television signal into a single stream with the addition of service bits;
  • Subscriber Administration (Management) System Subscriber Management System; SMS
  • Subscriber Management System Subscriber Management System
  • SMS Subscriber Management System
  • a system for accounting information about subscribers containing a database about subscribers, about subscribers' decoders, about services (services) subscribed to by subscribers, about settlements with subscribers and accounting for payments, coming from subscribers;
  • Scrambler (Scrambler; SCR) - a device designed to convert the structure of a digital telecommunication signal, without changing the symbol rate of this signal, in order to approximate its properties to those of a random signal;
  • SAS Subscriber Authorization System
  • ECM access rights
  • Control Word (Control Word; CW) - a data object used for scrambling (a low-level operational key that performs the process of scrambling and descrambling. CW changes at intervals of 0.5 to 10 s).
  • the service system for providing virtual channels to the end user consists of functionally interconnected transmitting 1 (operator) and receiving 2 (client) sides, where the transmitting side includes 3 communication lines connected to each other and to the multiplexer an electronic program guide server 4 (EPG server) and a CAS conditional access subsystem 5 (CAS subsystem) including a server conditional access 6 CAS (CAS Server) and encryption device 7, in particular, as shown in the diagram of figure 1, a scrambler (Scrambler), equipped with means of encryption and providing access to the encrypted content of linear channels.
  • EPG server electronic program guide server 4
  • CAS subsystem 5 CAS conditional access subsystem 5
  • server conditional access 6 CAS CAS Server
  • encryption device 7 in particular, as shown in the diagram of figure 1, a scrambler (Scrambler), equipped with means of encryption and providing access to the encrypted content of linear channels.
  • a client device is used - a digital satellite receiver 8 (set-top box, STB), equipped with at least a tuner/demodulator 9 (Tuner/Demodulator) that receives the MPEG-2 transport stream input signal and transmits it after processing to the input of the cryptomodule 10 (C AS modul) responsible for descrambling the incoming encoded stream, the input of which is connected to the input of the main processor AND (CPU), which processes data and transmits an audio-video signal presented to the end user by the user interface and channel content, to audio - video output.
  • a digital satellite receiver 8 set-top box, STB
  • tuner/Demodulator tuner/demodulator 9
  • C AS modul cryptomodule 10
  • main processor AND CPU
  • the input of the EPG server is connected to external control systems, in particular, control of algorithms for implementing the claimed solution pre-installed in the memory of the EPG server by entering the necessary data by the operator, and/or head equipment systems in automatic mode.
  • one of the outputs of the EPG server is connected to the first input of the CAS subsystem, and the second one is connected to one of the inputs of the multiplexer. Audio/video content (content) of the satellite broadcasting system is fed to the second input of the CAS subsystem.
  • AS Server and the scrambler are connected to each other via a feedback line and are provided with outputs associated with the corresponding inputs of the multiplexer.
  • the functional connection between the transmitting and client part of the virtual circuit service provision system is provided by a data transmission channel, which is used as a satellite signal (Transport Stream), MPEG-2 transport stream (ISO / IEC standard 13818-1, ETSI TS 102 154), generated by a multiplexer transmitting side and received by the client device.
  • a data transmission channel which is used as a satellite signal (Transport Stream), MPEG-2 transport stream (ISO / IEC standard 13818-1, ETSI TS 102 154), generated by a multiplexer transmitting side and received by the client device.
  • the modules, subsystems, equipment and hardware or structural elements and devices included in the virtual channel service system are equipped with hardware, structural and / or firmware tools that provide the functionality of the specified elements of the virtual channel service system according to the claimed solution.
  • the specified constructive and hardware means do not go beyond the generally accepted design solutions of the specified elements of the system.
  • their functionality, directly or indirectly, being in the constructive or functional unity of the elements of the system is regulated by the algorithms specified in the software and hardware way, pre-installed in the memory of the programmable hardware of the satellite broadcasting system to the end user, which control the hardware and constructive means of the virtual channel service system.
  • the server of the electronic program of television programs EPG (EPG server; EPG server) as part of the transmitting side of the virtual channels is a server equipped with a memory block (not shown in the diagram) that initially stores the transmission schedule for all operator channels, and is equipped with the means of generating a schedule of events for the content of linear broadcast channels, metadata and a schedule of virtual service channels.
  • the schedule of each of the virtual channels of the service is formed in the form of a layout of a selection of events of the content of linear broadcast channels, selected according to the criteria pre-installed for each virtual channel and broadcast within the virtual channels of the service sequentially in time, with setting for each event of the selection of the identifier of the corresponding virtual channel and the mark using an event in its composition.
  • the EPG server provides the formation of metadata of virtual channels, including basic data: their name, position in the general list of channels, broadcast schedule, as well as additional data, such as logos, icons of virtual channels and banners.
  • the EPG server also implements the formation and generation of metadata of services and carousels for broadcasting metadata.
  • the CAS subsystem of the transmitting side provides coding and provision of access to the encoded content of linear broadcast channels (linear channels) and virtual channels of the service, based on the schedule of virtual channels.
  • the CAS subsystem includes a CAS server (CAS Server) and a scrambler (Scrambler) that encodes the content of linear channels.
  • the CAS subsystem is equipped with means for generating control words encrypted with their session keys, as well as ECM and EMM messages containing them, for each linear and virtual channel of the service system or their group, and the same content event broadcast by different channels is performed an encrypted common control word encrypted with different session keys for each linear and virtual channel or group thereof.
  • the multiplexer (Multiplexer) of the transmitting part is equipped with means of forming a transport stream by embedding in it, at least, the content of linear broadcast channels, a schedule of content events, commands for accessing encrypted content.
  • the multiplexer provides formation of the transport stream (Broadcast Stream) by embedding into the transport stream the media content coming to the input from the broadcast operator, the service metadata file, additional metadata, commands for accessing the encoded content, and additional service information.
  • the transport stream at the output of the multiplexer is preferably an MPEG-2 transport stream and includes at least: linear broadcast channels, the content of which is also used as part of virtual channels; basic and additional metadata of the virtual channels service; optionally, the Linkage handle; MPEG-2 service tables of the transport stream, including: PMT program structure tables; CAT table of conditional access; NIT network information table; TDT date and time table; BAT table of program groups.
  • the receiving side of the claimed virtual channel service system is equipped with a client device made in the form of a digital satellite receiver, equipped with at least a tuner/demodulator that receives an MPEG-2 transport stream input signal, a cryptomodule designed to provide the ability to decrypt the incoming encrypted transport stream.
  • the cryptomodule is equipped with a sectional filter for setting virtual channel rights, an EMM type handler for messages corresponding to the virtual channel and the ability to send a command to set the rights and session keys of the virtual channel, as well as the main processor CPU that processes data, providing to the end user for audio-video output of the content of linear broadcast channels and virtual service channels in the user interface module.
  • the main CPU of the client device is configured to decrypt the incoming encrypted transport stream by means of an embedded security system and perform data processing that provides the end user with an audio-video output of the channel content in the user interface module, while the CPU is equipped with a sectional a filter for commands to set virtual channel rights, an EMM type handler for messages corresponding to a virtual channel, and the ability to send a command to set virtual channel rights and session keys.
  • the process of forming virtual channels of the service is carried out by sequentially performing the following steps of their formation, transmission and playback (broadcast).
  • a directory of virtual channels is formed containing at least basic data, including channel name and position number in the channel list, as well as additional, but not mandatory, data for each of the channels, for example, the channel logo for displaying it in the user interface module of the client device as a channel identification feature, a banner for displaying during technological breaks, for example , intended for its use when there is no linear channel broadcast in the virtual channel schedule.
  • the directory of virtual channels is created, stored and edited exclusively on the EPG server. Its adjustment from the side of the client device is not available.
  • the formation of a selection of events that should be added to the schedule of the generated virtual channels can also be carried out in a hardware-software way, both manually and automatically.
  • events transmissions
  • any event is characterized by the date and time of its beginning and end, as well as a set of metadata pointing to the original broadcast channel in the system.
  • the formation of a selection of virtual channel events by the operator is manually carried out in accordance with the selection by the software and hardware image of events corresponding to the subject of the virtual channel specified by the operator, or, for example, based on the results of analysis of content consumption.
  • a mark is set for the use of this event as part of a virtual channel and the identifier of a specific virtual channel, in the schedule of which the event should be added. In this case, the same event can be marked for adding to the schedule of several planned virtual channels.
  • the automatic formation of a selection does not require the direct participation of the operator, information about the transfers is added to the metadata file in a hardware-software way automatically, based on the results of searching for events in the web interface according to predefined criteria.
  • the search is carried out according to the specified parameters in the appropriate form of the EPG server web interface. For example, specific linear channels, event genres, keywords, and the like can be used as parameters for generating a selection of events.
  • the generation of metadata is initiated by selecting in the user interface of the EPG server the appropriate algorithm pre-installed in the software and hardware way and based on the data pre-installed or manually specified by the operator.
  • the EPG server is equipped with the means of generating, based on the specified algorithm, two types of metadata of virtual service channels: basic metadata and additional metadata, where
  • the main metadata is the schedule of each of the virtual channels with a directory of virtual channels, where the schedule for each of the virtual channels consists of events broadcast as part of the linear broadcast channels, marked in a predetermined way when forming a selection of virtual channel events.
  • additional metadata is graphic data, at least including a technological break banner set in pauses between adjacent broadcasts of virtual channel events, and a channel logo, etc. additional information perceived as a splash screen or a static image (logo).
  • the main metadata at least contains event parameters, including description, start and end time of the event, parameters of the linear broadcast channel in the SNT transport stream (Service ID, Network ID, Transport Stream ID), on which the event of the virtual channel is broadcast, identifier virtual channel, and parameters of virtual channels, including virtual channel name, position in the channel list, links to each of the additional metadata files with their binding to the virtual channel, for example, in the form of "dvb:" URL (see ETSI TS 102 851), that is, links to a specific file in a separately broadcast service.
  • event parameters including description, start and end time of the event
  • parameters of the linear broadcast channel in the SNT transport stream Service ID, Network ID, Transport Stream ID
  • identifier virtual channel identifier virtual channel
  • parameters of virtual channels including virtual channel name, position in the channel list
  • Technological interruptions in the broadcasting of a virtual channel can be caused, for example, due to the existing time difference between the end of one event (transmission) before the start of broadcasting of the next event (transmission) after it, since these events may belong to different linear broadcast channels, or spaced apart in time in broadcasting schedule of one linear channel.
  • the diagram of figure 2 shows examples of the formation of the schedule of the virtual channel, including with the setting of the technological break mark (fig.2a). As follows from the example shown in the diagram of figa), event 1 broadcast on a linear channel from 13:00 to 14:00 one day, event 2 broadcast on a linear channel from 14:30 to 15:00 can be added to the virtual channel schedule same day.
  • the time interval arising between events in the period from 14:00 to 14:30 is marked in the schedule with a technological break (fig.2a)).
  • the suppression of events in time is also taken into account (Fig. 2a)).
  • the event that starts earlier is added to the schedule.
  • the next event that can be added to the schedule of this virtual channel must have the start time of the event following only after the end of the broadcast of the first event.
  • the algorithm preinstalled in the EPG server memory adds a separate event to the virtual channel schedule, with the type of technological break.
  • the type of event is added by means of pre-installed hardware software for generating metadata and scheduling virtual channels of the EPG server, when generating a metadata file in the corresponding parameter, for example, as shown in the exemplary embodiment of the claimed invention in Table 1.
  • the list of required parameters specified in the metadata file differs from the list of required parameters for linear channel events broadcast as part of the service's virtual channels.
  • the main metadata is a JSON file
  • additional metadata is an archive containing all the necessary graphic data files.
  • the necessary data is re-generated with subsequent transmission to the components of the transmitting side: to the CAS and to the input of the multiplexer.
  • the generated metadata is formed in a manner known from the prior art, by means of the appropriate pre-installed firmware of the EPG server, into streams and transmitted to the input of the multiplexing device.
  • the file containing the main metadata of the virtual circuit service is transmitted as a data carousel stream (Data 'carousel, ETSI TR 101 202).
  • An archive containing additional metadata is formed and transmitted as an object carousel stream (Object carousel, ETSI TR 101 202).
  • the carousel method is a mandatory way to broadcast data in transport stream to guarantee the delivery of data to the client device, taking into account the cyclical repetition of data in the stream.
  • the generated schedule of virtual channels is transferred from the EPG server to the conditional access subsystem C AS.
  • the main metadata (the generated schedule of virtual channels) is transmitted to the remote access subsystem, to the CAS server, simultaneously with the transfer of the main metadata to the input of the multiplexer.
  • the main metadata as mentioned earlier, necessarily contain the following information: channel parameters (including the SNT parameters of linear channels used as part of the virtual channels of the service), date/time of the start and end of linear channel events.
  • the content is encrypted and the data of broadcast channels and content is generated in the CAS conditional access subsystem (fig3) corresponding to DVB-Simulcrypt standards (ETSI TS 103 197), according to the algorithm DVB CSA (Digital Video Broadcasting Common Scrambling Algorithm).
  • fig3 CAS conditional access subsystem corresponding to DVB-Simulcrypt standards (ETSI TS 103 197), according to the algorithm DVB CSA (Digital Video Broadcasting Common Scrambling Algorithm).
  • an open (unencrypted) transport stream (TS) is supplied, which, in addition to additional information, contains audio and video content of linear satellite broadcast channels.
  • the scrambler generates control words (CW) used to encrypt the transport stream by means of a control word generator (not shown in the diagrams of FIG. 3) made in hardware and software.
  • the functional component of the CAS server 6, the EMM message generator 13 (EMMG) (FIG. 3) transmits the generated session key (OrKey) used to encrypt/decrypt the CW.
  • the scrambler sends the CW to the server's CAS functional component, to the ECM message generator 12 (ECMG) (FIG.
  • the CW control words are encrypted using the OrKey session keys to subsequently generate an ECM message containing the encrypted CW control words.
  • the transport stream content is encrypted using CW control words and adding ECM messages.
  • EMMG generates EMM messages containing service data, information about access rights and specialized commands.
  • the generated EMM messages are also transmitted to the input of the multiplexer 3, where the transport stream is formed by embedding the service metadata into the transport stream of the content of the linear broadcast channels.
  • an encrypted transport stream is obtained containing ECM and EMM messages according to the DVB standard (ETSI TS 102 470-1), which are transmitted to the input of the client device to receive and decrypt the secure transport stream at the receiving part of the satellite system.
  • ETSI TS 102 470-1 DVB standard
  • C AS together with the head equipment, allows you to manage subscribers' access to their services for the implementation of pay TV services.
  • decryption of the encoded content is carried out by means of a cryptomodule and a smart card.
  • the smart card stores OrKey session keys and access rights recorded by the cryptomodule after receiving the EMM from the transport stream.
  • the cryptomodule checks the OrKey session key stored on the smart card with a specific ECM message. A positive result of the comparison confirms the relevance of the session key and its subsequent use to calculate CW and, as a result, decrypt the encoded content.
  • conditional access system of the claimed solution provides the following actions:
  • the EMM message generator After processing the received schedule, the EMM message generator generates a set of session keys for accessing virtual channel events, different from session keys for accessing linear broadcast channels.
  • the control words are further encrypted with the generated virtual channel session keys.
  • the same content is scrambled (encrypted) using several session keys: one of which is used to descramble the content outside the service, the other is used to descramble the same content when it is played within the virtual channels service.
  • an encrypted data stream for descrambling is transmitted from the CAS subsystem to the input of the multiplexer, where the transmission of EMM messages from the CAS server necessary for descrambling the events specified in the schedule within the virtual channel is compared with the schedule: distribution of rights in accordance with the start of events, command Suspension of access rights to an event of a given virtual channel occurs in accordance with the end of the event.
  • the multiplexer is configured to embed the data received from the EPG server and the CAS subsystem into the TS transport stream.
  • the service broadcast parameters are set manually or automatically in a hardware-software manner, for example, via the interface of the CAS subsystem, the service broadcast parameters - SNT.
  • a separate service is allocated as part of the transport stream: a separate package (PID) is allocated for basic metadata and additional metadata to simplify the search for the desired metadata component.
  • Metadata broadcasting is carried out in one service, preferably only on one transponder, which saves transponder capacity used for metadata broadcasting.
  • service information is used with a link to the service with metadata, which is a Linkage descriptor (Linkage descriptor, ETSI EN 300 468 VI.14.1).
  • Linkage descriptor is added in the graphical interface of the multiplexer to the network information flow table - NIT (Network Information Table, ETSI EN 300 468).
  • NIT Network Information Table
  • Transport Stream ID Original Network ID
  • Service ID broadcast parameters of the metadata file (SNT).
  • Linkage descriptor allows you to create a service of virtual channels without user feedback, which provides additional protection of content when realizing the possibility of viewing it as part of virtual channels.
  • the transport stream generated in accordance with the claimed invention at the output of the MPEG-2 multiplexer contains at least:
  • PMT Program Map Table
  • program structure table Included in the stream for each TV program and contains the PID of the TV program components - video, sound, synchronization.
  • PMT contains messages of the ECM of the conditional access system, if the program contains encrypted elementary streams.
  • Network Information Table - network information table. Contains parameters of the communication system.
  • TDT Time Data Table
  • BAT Boquet Association Table
  • the TS transport stream arrives at the client device (figure 4) of the receiving part of the service.
  • the processing of the TS transport stream and virtual circuit service metadata by the client device is as follows.
  • the client device is a digital satellite receiver (STB, “Set-Top Box” in the diagram), equipped with at least a tuner/demodulator (“Tuner/Demodulator”) that accepts an MPEG-2 transport stream input signal, a cryptomodule (“CAS module ”), responsible for descrambling the incoming coded stream and the main processor (“CPU”), which processes the data and transmits the audio-video signal, which is presented to the end user by the user interface and channel content, to the audio-video output (“HDMI”).
  • a smart card (“SmartCard”) or a built-in smart card emulator (“SmartCard emulator”) as part of the cryptomodule is installed in the receiver, then simply a “smart card” containing keys and access rights to the content.
  • a sectional filter is implemented for commands to set virtual channel rights, an EMM message handler corresponding to a virtual channel, and sending a command to set rights and an OrKey virtual channel session key to a smart card.
  • the operation of the virtual circuit service on the STB is carried out by the CPU and as follows:
  • Service metadata discovery in the transport stream (FIG. 5) is performed primarily by the CPU STB by processing the appropriate table in the incoming transport stream (NIT) to find the linkage descriptor and check its validity. According to the descriptor of the SNT service parameters in the linkage, the corresponding metadata is loaded into the TS.
  • the presence of a satellite signal at the antenna input of the STB is sufficient to form a virtual channel.
  • the user interface After loading the CPU metadata, the user interface displays a virtual channel with the name, position and logo defined in the metadata and displayed in the corresponding user interface module along with the name of the virtual channel.
  • the display of the virtual channel schedule is implemented to familiarize and support the functionality implemented for linear channels.
  • the metadata is also updated on the STB, starting with the loading of the metadata.
  • the operation of the virtual channels service on the client device during interaction with the user is carried out as follows.
  • the operation of the service after the user selects to view a virtual channel (figure 6), for example, by selecting a channel in the list by pressing a button on the remote control, for the most part consists in displaying the content of the selected virtual channel (automatic switching according to the schedule) with descrambling the corresponding content.
  • the CPU STB When viewing a virtual channel, the CPU STB automatically switches on content according to the schedule: switching to a linear channel according to SNT parameters if the current event is broadcast on a linear channel, or displaying a banner received as part of metadata if the current event is a technological break.
  • the subsequent operation of the virtual channel service is carried out according to the received schedule: at the end of the current event, switching to SNT of another linear channel is performed if the next event is broadcast on a linear channel, or a banner received as part of additional metadata is displayed if the next event is a technological break.
  • the main processor After automatic switching (Fig.7) to a certain linear channel as part of the virtual one, the main processor makes a request to the cryptomodule to descramble the corresponding content.
  • the cryptomodule initiates a call to the smart card to decrypt the control word to descramble the virtual channel content, configures the elementary streams for the descrambler according to the PMT received from the main processor (Program Map Table service table) to receive ECM messages, sets the CW control words received from the descrambler to the descrambler. smart cards.
  • Decoding of the corresponding content after automatic switching to a linear broadcast channel that broadcasts a content event as part of a virtual service channel, setting the elementary streams of the transport stream for the descrambler in accordance with the information of the PMT service table to receive ECM messages and setting control words in the descrambler is carried out by the main processor, made with the ability to decrypt the incoming encrypted stream through the built-in security system.
  • the CPU of a digital satellite receiver can automatically turn on the broadcast of the content of the linear broadcast channel according to the schedule by switching to the linear broadcast channel according to the SNT parameters, if the current event is broadcast on the linear broadcast channel, or display a banner received as part of the metadata virtual channel if the current event is a technology event.
  • the linear channel is descrambling for the duration of the broadcast of the event when it is played within the virtual channel service, while the content of the linear channel outside the virtual channel service remains encoded.
  • CAS provides access only for specified TV programs in the mode of operation of the virtual channel.
  • Access to TV programs of a virtual channel while watching the source channel remains closed (in the absence of a valid subscription). That is, all TV programs when watching a regular channel remain unavailable if there is no subscription.
  • the channel content availability time is shifted in accordance with the new start/end time. This is also controlled by ECMG using the virtual channel session key strictly in accordance with the actual virtual channel broadcast schedule.
  • Modules, blocks, and other components have been described above in terms of their features and the functionality they provide, along with optional and preferred features. With the information provided and the characteristics and description given, the practical implementation of these features and specific implementation details can be determined by the developer. For example, certain modules could be implemented using software, and some or all of the components could be implemented using dedicated hardware.
  • modules and components described above are merely illustrative examples.
  • the invention may be implemented in a variety of ways, and in particular, some components may be integrated with others that perform similar functions, or some components may be omitted in simplified implementations.
  • Hardware and software implementations of each of the described functions can be combined in any combination, both between several components, and for each individual component.
  • the claimed solution of the group of inventions provides a simple solution for expanding the operational capabilities of a satellite broadcasting system, by expanding the capabilities of broadcasting content without increasing the transponder capacity and memory of the transmitting and client parts, while increasing the level of content protection by forming virtual channels, the broadcasting of content of which does not require pre-recording of content linear channels of broadcasting, due to the formation of the schedule of broadcasting of a virtual channel by generating a selection of events of the content of linear channels of broadcasting, selected according to the criteria pre-installed for each virtual channel and broadcast within the virtual channels of the service sequentially in time and ensuring the broadcasting of the content of the virtual channel by secure switching to the broadcast in in accordance with the schedule of the virtual channel, the content of linear channels broadcast at the specified time.

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

Abstract

L'invention concerne un système de service de fourniture de canaux virtuels, comprenant des parties d'émission et de réception (client) d'un système de notification par satellite, comprenant en outre des moyens de génération de canaux virtuels de service, un serveur EPG comportant des moyens de génération de métadonnées de canaux virtuels et des horaires des canaux virtuels sous forme d'un ensemble de sélection d'évènements de contenu de canaux linéaires de notification sélectionnables en fonction de critères prédéfinis pour chaque canal virtuel et capables de retransmission dans le cadre des canaux virtuels de service successivement dans le temps, en indiquant pour chaque évènement de la sélection un identifiant du canal virtuel correspondant et un marqueur d'utilisation de l'évènement dans sa composition; le sous-système d'accès conditionnel CAS comprend des moyens de génération de mots de commande qui sont cryptés par des clés de session, et de message ECM et EMM les contenant pour chaque canal linéaire et virtuel du système de service ou leur groupe; un même évènement de contenu à retransmettre par des canaux différents est crypté par un mot de commande commun, crypté par différentes clés de session pour chaque canal linéaire et virtuel ou leur groupe.
PCT/RU2021/000621 2021-09-21 2021-12-29 Système et procédé de génération de canal virtuel WO2023048590A1 (fr)

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RU2021127614A RU2781944C1 (ru) 2021-09-21 Система и способ формирования виртуального канала

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090320072A1 (en) * 2008-05-12 2009-12-24 Microsoft Corporation Custom channels
RU2419216C2 (ru) * 2005-12-19 2011-05-20 Конинклейке Филипс Электроникс, Н.В. Система, устройство и способ создания шаблонов, предлагающих установки по умолчанию для типичных виртуальных каналов
US20130081086A1 (en) * 1999-10-08 2013-03-28 Jin Pil Kim Virtual channel table for a broadcast protocol and method of broadcasting and receiving broadcast signals using the same
US20140189743A1 (en) * 2012-12-31 2014-07-03 Echostar Technologies L.L.C. Automatic learning channel customized to a particular viewer and method of creating same
US20180124443A1 (en) * 2007-11-01 2018-05-03 At&T Intellectual Property I, L.P. System and method of restricting access to media content

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130081086A1 (en) * 1999-10-08 2013-03-28 Jin Pil Kim Virtual channel table for a broadcast protocol and method of broadcasting and receiving broadcast signals using the same
RU2419216C2 (ru) * 2005-12-19 2011-05-20 Конинклейке Филипс Электроникс, Н.В. Система, устройство и способ создания шаблонов, предлагающих установки по умолчанию для типичных виртуальных каналов
US20180124443A1 (en) * 2007-11-01 2018-05-03 At&T Intellectual Property I, L.P. System and method of restricting access to media content
US20090320072A1 (en) * 2008-05-12 2009-12-24 Microsoft Corporation Custom channels
US20140189743A1 (en) * 2012-12-31 2014-07-03 Echostar Technologies L.L.C. Automatic learning channel customized to a particular viewer and method of creating same

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