WO2007118347A1 - Structure de système de diffusion combinée destinée à combiner la partie câblée et la partie radio et procédé associé - Google Patents

Structure de système de diffusion combinée destinée à combiner la partie câblée et la partie radio et procédé associé Download PDF

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Publication number
WO2007118347A1
WO2007118347A1 PCT/CN2006/000673 CN2006000673W WO2007118347A1 WO 2007118347 A1 WO2007118347 A1 WO 2007118347A1 CN 2006000673 W CN2006000673 W CN 2006000673W WO 2007118347 A1 WO2007118347 A1 WO 2007118347A1
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Prior art keywords
network
content
broadcast
transport stream
information
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PCT/CN2006/000673
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English (en)
Chinese (zh)
Inventor
Xinxi Diao
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Zte Corporation
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Application filed by Zte Corporation filed Critical Zte Corporation
Priority to PCT/CN2006/000673 priority Critical patent/WO2007118347A1/fr
Priority to CN200680052610XA priority patent/CN101371576B/zh
Publication of WO2007118347A1 publication Critical patent/WO2007118347A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/67—Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency

Definitions

  • Wired and wireless coordinated collaborative broadcast system structure and method thereof Wired and wireless coordinated collaborative broadcast system structure and method thereof
  • the present invention relates to the field of communications, and in particular to a cooperative structure and method for a cable television network and a terrestrial digital broadcast network. Background technique
  • the current cable television network (HFC: Fiber Coax Hybrid Network, xPON: Passive Optical Network) has integrated the convergence of broadcasting services (terrestrial wireless, terrestrial cable and satellite broadcasting services), telephony services, and Internet services. Has become the most content network.
  • HFC Fiber Coax Hybrid Network
  • xPON Passive Optical Network
  • the mainstream technology used in cable digital TV is the DVB-C standard, DVB-C uses the MPEG-2 compression-encoded transport stream, and the transmission medium uses coaxial lines.
  • the DVB-C modulation method is generally 64-QAM, and sometimes 16-Q fine, 32-QAM or higher 128-QAM, 256-QAM can also be used.
  • 64-QAM In an 8MHz standard TV channel, if 64-QAM is used, the data rate transmitted is 38.5 Mb/s.
  • the existing terrestrial digital broadcasting system has both a multi-frequency network and a single-frequency network.
  • the networking of the multi-frequency network is similar to that of the analog television broadcasting.
  • Different transmitters use different carriers to transmit broadcast signals, and the content between different transmitters can be the same. It can also be different, and strict synchronization relationships are not required between transmitters.
  • Existing terrestrial digital broadcast single frequency networks require strict time synchronization, frequency synchronization and bit synchronization between transmitters at different locations.
  • the remultiplexer 101 is used for multiplexing different programs to form an MPEG-2 transport stream TS (Transport Streams) transmitted by one way (on the same carrier frequency), and the single frequency network adapter 102 is used to insert the TS stream.
  • TS Transport Streams
  • GPS clock 103 is a single frequency network adapter 102 and DVB-T/H modulation
  • the transmitter 108 provides a time reference.
  • the sender network adapter 104 and the receiver network adapter 106 are used for transparent transmission of the MPEG-2 code stream TS on the distribution network.
  • the distribution network 105 can be a network of various forms, such as SDH (Synchronos Digital Hierarchy, Synchronous digital series), Ethernet, etc.
  • the synchronizing unit 107 is used for synchronous transmission between the respective transmitters, and the synchronization time information carried by the transport stream TS is compared with the GPS time to determine the transmission timing, and the DVB-T/H modulator 108 is Under synchronization of the synchronization unit 107, the transport stream TS is OFDM-modulated in accordance with the coding control information carried by the transport stream TS.
  • Cable TV networks can also use a variety of transmission media, such as HFC, EP0N (Ethernet passive optical network), etc. Different cable TV networks are similar in composition. Here are the most common HFC networks, EP0N and other forms. The cable network and HFC have similar topological forms and network elements.
  • 2 is a cable network composed of an SDH (Synchronous Digital Hierarchy) distribution network and a HFC network, including: a remultiplexer 201, a QAM modulator/mixer 202/208, a sender network adapter 203, SDH network 204, HFC network 205/209, set top box 206, and receiving network adapter 207.
  • SDH Serial Digital Hierarchy
  • HFC network including: a remultiplexer 201, a QAM modulator/mixer 202/208, a sender network adapter 203, SDH network 204, HFC network 205/209, set top box 206, and receiving network adapter 207.
  • the remultiplexer 201 receives the TS streams from different networks and MPEG-2 encoders, re-multiplexes them, and then directly sends them to the local QAM modulator/mixer 202 (according to the DVB-C standard) for local
  • the HFC network 205 performs broadcast of the DVB-C standard. After the broadcast signal is demodulated and demultiplexed by the set top box 206, a video and audio code stream is formed and sent to the television receiver.
  • the network adapter 203 and the SDH network pass through the transmitting end. 204.
  • the receiving network adapter 207 sends it to the remote HFC network 209, and is modulated by the QAM modulator/mixer 208 (according to the DVB-C standard) to the set top box 206.
  • PHS Personal Handphone System
  • WIMAX Worldwide Interoperability for Microwave Access
  • WLAN Wireless Local Area Network
  • cable TV networks that incorporate many services also need to extend wirelessly. This kind of extension can not only solve the mobile reception of content, but also solve the coverage problem of the terrestrial digital broadcasting network. Further, the potential of the digital television receiver of the mobile terminal can be fully exploited, so that it is not only a television receiver but A functional unit that integrates TV reception, data download, and data communication.
  • Patent application for cable TV network to wireless extension wireless and wireless collaboration
  • US20060029090 entitled “Method and system for distributing wireless communication signals in an HFC”
  • the communication system described in the patent application is: adding a plurality of wireless interface nodes to the HFC network and a wireless communication protocol controller located at the head end of the HFC.
  • the wireless communication protocol controller is connected.
  • the uplink signal received by the contact pair is down-converted into the uplink frequency band of the HFC, and the wireless node up-converts the downlink signal to be transmitted into the frequency band used by the wireless communication device.
  • the wireless system protocol herein is Refers to the WIMAX protocol.
  • the disadvantage of the existing cable television broadcasting network is that the signal transmitted therein cannot be directly received by the wireless communication device, which limits the receiving range of the cable television content; the existing digital terrestrial broadcasting signal is difficult to achieve indoor coverage, and it is difficult to cover the outdoor. Uniform and sufficient signal strength is generated, and the number of programs is small; the technology given in the patent application US20060029090 can improve the signal coverage of the wireless communication system through the HFC network, but occupies the broadcasting service band of the HFC network, and cannot improve the terrestrial digital broadcasting. Cover the quality of the effect. Invention
  • the technical problem to be solved by the present invention is to provide a wired and wireless coordinated cooperative broadcast system structure and method thereof, which solves the problem that the prior art cannot radiate the rich content of the cable television network from the coaxial cable to the space, and cannot realize the digital number with the ground.
  • the technical problem of the coordination of the broadcasting network is to provide a wired and wireless coordinated cooperative broadcast system structure and method thereof, which solves the problem that the prior art cannot radiate the rich content of the cable television network from the coaxial cable to the space, and cannot realize the digital number with the ground.
  • the present invention provides a wired and wireless coordinated cooperative broadcast system structure, which is characterized in that: comprising: adding a coordinated single frequency network adapter and a GPS receiver in an existing cable television network, in a cable television network
  • the HFC subnet adds sequential QAM demodulation and demultiplexing, a single frequency network synchronization unit connected to the GPS receiver, a modulator and a transmitter; and adds a sequential demultiplexing unit to the receiving network adapter connected to the SDH network.
  • the coordinated single frequency network adapter classifies a transport stream from a different network, and transmits to the air using a modulator and a transmitter a stream is added to a "area-frequency"correspondence;
  • the QAM demodulation and demultiplexing is used to decompose a set of transport streams corresponding to a radio broadcast channel from the transport stream;
  • the demultiplexing unit is configured to The transport stream decomposes a set of transport streams corresponding to a radio broadcast channel;
  • the modulator is configured to carry "areas" according to its own location and transport stream a frequency "correspondence relationship determines its own operating frequency, transmit power;
  • the transmitter is used to The transport stream corresponding to the terrestrial digital television broadcast channel is transmitted to the corresponding service area, thereby jointly transmitting the cable television network to the terrestrial digital television broadcast network, using the cable television network to transmit the space radiation to the terrestrial digital television broadcast channel exactly the same Signals to improve coverage of terrestrial digital television networks
  • the foregoing collaborative system is characterized in that: the classification processing performed by the coordinated single frequency network adapter includes: determining whether the transport stream has carried the single frequency network synchronization information; determining that the single frequency network synchronization information needs to be added to the transport stream sent to the HFC network.
  • the program code stream, and corresponding to the single frequency network synchronization information includes: determining whether the transport stream has carried the single frequency network synchronization information; determining that the single frequency network synchronization information needs to be added to the transport stream sent to the HFC network.
  • the cooperative system described above is characterized in that the coordinated single frequency network adapter further adds synchronization quality measurement and signal amplitude measurement control information to the MPEG-2 transport stream according to the required signal, so as to ensure stable operation of the single frequency network.
  • the single frequency network synchronization information includes: a frequency used by different code streams or code stream groups in different geographical spaces, and the coordinated single frequency network adapter is inserted for different transport streams.
  • the area information is a position coordinate and a coverage radius of the transmitter, and the modulator and the transmitter at different positions determine the working frequency point, the modulator and the transmission to be used according to the area information.
  • the position of the machine is preset or obtained by installing a GPS receiver.
  • the above-described cooperative system is characterized in that the modulator is a DVB-T/H modulator or a DMB/DAB modulator based on an orthogonal frequency division multiplexing broadcast standard.
  • the cooperative system described above is characterized in that the time reference used by the single frequency network synchronization unit is taken from a GPS receiver or taken from a time reference provided in the HFC network.
  • the cooperative system described above further comprising: a pre-content server, the pre-content server connecting the QAM demodulation and demultiplexing, a single frequency network synchronization unit; and/or the pre-content server connecting the a demultiplexing unit, a single frequency network synchronization unit; the pre-content server is configured to store predetermined content that needs to be sent by the modulator.
  • the above-mentioned collaborative system is characterized in that the network uploads the predetermined content by using an idle period, thereby fully utilizing the HFC spectrum of the idle period, and avoids repeatedly transmitting the same content by using the HFC bandwidth during the busy period of the service.
  • the above-mentioned collaborative system is characterized in that the predetermined content includes: predetermined broadcast content and/or content with high download frequency.
  • the above-mentioned collaborative system is characterized in that a content mirror of each pre-content server is established in the network.
  • the content mirror database stores the union of the content of each pre-content server; the network performs regular maintenance or immediate maintenance on the content of the pre-content server to upload new content and clean out obsolete content. And check the consistency of the content.
  • the above-mentioned collaborative system is characterized in that the network performs the plan-based loading, the statistical loading or the instant loading on the predetermined content, and the predetermined content of the ordinary data is loaded in the communication idle period, and the scheduled content of the live broadcast and the breaking news data is loaded. Load in real time.
  • the present invention further provides a method for cooperative broadcast according to the foregoing coordinated system, which is characterized in that it comprises:
  • Step 1 pre-store the pre-broadcast program content in the pre-content server, and the pre-stored program content is a transport stream that joins the single-frequency network synchronization control information;
  • Step 2 pre-storing the broadcasted scheduled time information into the pre-content server
  • Step 3 the pre-content server according to the predetermined time, or after the pre-content server receives the dial-out control signal, the modulator sends the radiotelephone according to the synchronization control information carried by the transport stream.
  • the pre-stored program content is used to ensure that the pre-stored program content is the identical transmission stream of the single-frequency network synchronization information to be broadcasted by the terrestrial digital broadcasting network, thereby forming a coordinated transmission of the cable television network and the terrestrial digital broadcasting network.
  • the method for cooperative broadcast described above is characterized in that: the pre-broadcast program content is content of a terrestrial television broadcast program that needs to be broadcasted in a specific time in the future, and the pre-broadcast program content is also used for downloading services.
  • the single-frequency network synchronization information is removed during the download; the pre-content server flexibly selects the broadcast time and the broadcast mode under the control of the network for the content of the independent broadcast or the content for downloading.
  • the present invention further provides a method for cooperatively transmitting auxiliary information according to the foregoing coordinated system, which is characterized in that it comprises:
  • Step A Cooperating with the single frequency network adapter to obtain a priori information of the network coverage
  • Step B Cooperating with the single frequency network adapter to classify services in the transport stream
  • Step C Cooperating with the single frequency network adapter to add auxiliary information to the transport stream;
  • Step D Perform adaptation processing of the HFC channel.
  • the above method for cooperatively transmitting auxiliary information is characterized in that the prior information is obtained by storing planning data of a terrestrial digital broadcasting network in a head end of a cable television network.
  • the method for cooperatively transmitting auxiliary information is characterized in that: the planning data includes: a channel/carrier that the operator can use for the wireless extension of the cable television network in different geographical areas, The pre-defined planning information of the number of sets of programs transmitted by each carrier and the coded modulation mode, and the predetermined number of sets of programs that need to be transmitted to the wireless extension in a predetermined total number of sets of programs transmitted in one coaxial cable channel.
  • the above method for cooperatively transmitting auxiliary information is characterized in that the a priori information further includes program multiplexing information, and the program multiplexing information is acquired through a program auxiliary table.
  • the method for cooperatively transmitting auxiliary information is characterized in that: in the step B, the classification is distinguished according to a network information table carried by the transport stream: a code stream from a terrestrial digital television broadcast single frequency network, a code from a satellite network Stream and/or code stream from the Internet.
  • the method for cooperatively transmitting auxiliary information is characterized in that, in the step C, if the single-frequency network synchronization information has been carried in the transport stream, the area-frequency correspondence table is added to the transport stream;
  • the table describes the center and radius of the area using a particular channel ⁇ carrier; there may be multiple area centers and area radii in an area frequency correspondence table to construct a flexible coverage area shape.
  • the foregoing method for cooperatively transmitting auxiliary information is characterized in that: further comprising: adding a power control parameter to the transport stream to control the coverage.
  • the method for cooperatively transmitting auxiliary information is characterized in that, in the step c, if there is no single frequency network synchronization information in the transport stream, the single frequency network synchronization information and the area-frequency correspondence table are added to the transport stream; If it is a transport stream from a terrestrial digital broadcast multi-frequency network and there is no single-frequency network synchronization information, it is processed in the following two ways: Mode 1: As a non-cooperative single-frequency network processing, the inserted frequency information ensures more digital terrestrial broadcasting.
  • the frequency network is different to avoid interference to the terrestrial digital broadcasting network; mode 2: inserting a region-frequency correspondence table and autonomous synchronization control information into the transport stream, so that the terrestrial digital broadcast code stream transmitted through the HFC is measured at the location The time relationship of the terrestrial digital broadcast signals to achieve synchronization of GPS-free signals.
  • the foregoing method for cooperatively transmitting auxiliary information is characterized in that, for a code stream from a non-cable television network, content that needs to be transmitted to the air among the programs is divided into a plurality of radio channel groups according to a predetermined number of programs transmitted by the air interface.
  • the programs in the same radio channel group are transmitted in the same radio channel; the transmission parameter signaling required for wireless transmission is added to each group of programs and the jumbo frame initialization parameter packet synchronization information required for constructing the single frequency network;
  • a region-frequency correspondence table is added to the transport stream.
  • the above method for cooperatively transmitting auxiliary information is characterized in that the non-cable television network is a satellite signal network or the Internet.
  • the above method for cooperatively transmitting auxiliary information is characterized in that, in step D, if the capacity of one HFC's cable channel can transmit a plurality of wireless channel groups, the plurality of wireless channel groups are multiplexed into one wired channel for transmission.
  • the present invention further provides a method for providing a mobile phone television service by a cable television network and a terrestrial digital broadcasting network according to the above-mentioned cooperative system, which is characterized in that the DVB-H format transmission stream Distributed by the network to various DVB-H modulators and transmitters arranged indoors and outdoors, each DVB-H modulator modulates the transport stream according to the synchronization information and transmission parameter signaling in the transmission jumbo frame initialization parameter packet, and then Send through the transmitter to the area that needs to be covered.
  • the DVB-H format transport stream comprises: a DVB-H format transport stream of a terrestrial digital mobile broadcast network, and a format Transform processing forms a transport stream of the DVB-H format.
  • the above method for providing a mobile phone television service by a cable television network and a terrestrial digital broadcasting network wherein the DVB-H format transport stream formed by the format conversion process is a satellite MPEG-2 transport stream through a DVB-H format The conversion is formed.
  • the invention has the advantages that: the invention radiates the rich content of the line television network from the coaxial cable to the space, and the extension adopts the transmission form of the single frequency network, which can efficiently use the spectrum of the terrestrial television broadcast, and can realize Collaboration of terrestrial digital broadcasting networks.
  • the invention realizes a wired and wireless coordinated broadcast network based on the cable television network, and the wired and wireless coordinated broadcast network realizes: 1) enhancing the intensity and coverage uniformity of the terrestrial digital television broadcast signal; 2) using the cable television The signal is expanded from the TV socket to the space to achieve indoor and outdoor coverage of the cable television signal; 3) enabling the cable television network to efficiently support the content download service and the broadcast service of the predetermined content; 4) while achieving the above effects, the new The system maintains full compatibility with the existing cable TV system; the home TV can be flexibly selected for placement, and the mobile TV can receive good reception quality both indoors and outdoors.
  • the mobile TV can receive satellite TV broadcast through the DVB-H receiving front end. content.
  • Figure 1 shows a conventional single-frequency network structure for terrestrial digital television broadcasting
  • Figure 2 shows the structure of the existing cable television broadcasting network
  • Figure 3 Structure of an integrated service system that is wired and wireless
  • Figure 4 shows a wired and wireless coordinated integrated service system structure
  • Figure 5 Method for inserting coordinated emission assistance information to achieve the best mode of the invention
  • the cable television network has become the most abundant network
  • the rich content of the cable television network is radiated from the coaxial cable to the space, and this extension adopts the transmission form of the single frequency network
  • the spectrum of the terrestrial television broadcasting can be efficiently used. , and can also achieve synergy with the terrestrial digital broadcasting network.
  • the invention is based on a cable television network and constructs a wired and wireless coordinated broadcast network.
  • the wired and wireless coordinated broadcast network is used for: 1) enhancing the intensity and coverage uniformity of terrestrial digital television broadcast signals; 2) wiring The TV signal is expanded from the TV socket to the space to realize indoor and outdoor coverage of the cable television signal; 3) enabling the cable television network to efficiently support the content download service and the broadcast service of the predetermined content; 4) while achieving the above effects, new The system remains fully compatible with existing cable television systems;
  • the invention specifically includes four parts of Al, A2, B, and C.
  • the wired and wireless cooperative integrated service system of the present invention is based on the existing system, as shown in FIG. 2, adding a coordinated single frequency network adapter 301, a GPS receiver 302, QAM demodulation and demultiplexing 303, and a single frequency.
  • the coordinated single frequency network adapter 301 in the system classifies the transport stream TS from different networks, for example, the cooperative single frequency network adapter 301 determines whether the transport stream TS has carried the single frequency network synchronization information, and transmits the transmission to the HFC network. Which program stream in the stream TS needs to join the single-frequency network synchronization information for judgment, and adds the single-frequency network synchronization information to the TS stream that needs to join the single-frequency network synchronization information, and the added single-frequency network synchronization information includes: relative to GPS seconds The synchronization time of the pulses, the frequency of different code streams or codestream groups used in different geospatial spaces.
  • the coordinated single frequency network adapter 301 also adds synchronization quality measurement and signal amplitude measurement control information to the MPEG-2 transport stream according to the required signal to ensure stable operation of the single frequency network.
  • the cooperative single frequency network adapter 301 processes the TS input from the remultiplexer 201 under the time synchronization provided by the GPS receiver 302 in order to add the synchronization information required by the single frequency network to the MPEG-2 transport stream.
  • the MPEG-2 transport stream processed by the coordinated single frequency network adapter 301 can take two transmission sides. One type is sent to the demultiplexing unit 307 via a distribution network (such as the SDH network 204).
  • the demultiplexing unit 307 decomposes from the MPEG-2 transport stream and needs to be transmitted through the transmitter 306 or needs to be stored by the pre-content server 402. That part of the stream.
  • the sender network adapter 203 and the receiver network adapter 207 are configured to implement transparent transmission of the MPEG-2 transport stream in the SDH network 204; one way is directly to the QAM modulator/mixer 202 without passing through the distribution network, and then Then, it is sent to the QAM demodulation and demultiplexing 303 through the HFC network, and the QAM demodulation and demultiplexing 303 decomposes a set of TS streams corresponding to one radio broadcast channel from the transport stream carried on one HFC carrier frequency (this group)
  • the TS stream corresponds to a plurality of programs that can be transmitted on the same radio broadcast frequency, and the TS transport stream carrying the single-frequency network synchronization information inserted by the coordinated single-frequency network adapter 301 passes through the DVB-T/H modulator.
  • transmitter 306 is sent to the area it serves, where the single frequency network synchronization unit 304 is for the DVB-T/H modulator Simultaneous control is implemented at the time of code stream transmission.
  • the difference between the cooperative single frequency network adapter 301 and the existing single frequency network adapter 102 is that: the existing single frequency network adapter only adds synchronization information to the transport stream TS sent from the remultiplexer 101 (by initializing the packet MIP in the megaframe)
  • the cooperative single frequency network adapter 301 needs to implement the classification processing of the transport stream TS from different networks in addition to the functions of the existing single frequency network adapter 102.
  • the coordinated single-frequency network adapter 301 needs to determine whether the transport stream TS has carried the single-frequency network synchronization information, determine which of the transport streams TS sent to the HFC network need to join the single-frequency network synchronization information, and determine that the transport stream TS needs to join.
  • the frequency of the TS stream of the single-frequency network synchronization information needs to be adopted in different geographical locations.
  • the coordinated single-frequency network adapter 301 can also add measurement control information to the single-frequency network according to the measurement requirements.
  • the time reference used by the single frequency network synchronization unit 304 can be taken from the GPS receiver 302 or from a time reference provided from within the HFC network.
  • the coordinated single frequency network adapter 301 is an area covered by a different TS transmission stream into its corresponding single frequency network (or a frequency point in its corresponding multi-frequency network), and these areas may be represented in various forms.
  • One representation is to insert the position coordinates and coverage radius of the transmitter in the TS transport stream.
  • the modulators and transmitters at different locations use this information to determine the operating frequency point they should use.
  • the position of the modulator and transmitter can be preset or can be obtained by installing a GPS receiver.
  • the wired and wireless coordinated broadcast system provided by the present invention is characterized by: a cooperative single frequency network adapter 301, a DVB-T/H modulator (which may also be other OFDM-based broadcasts) is added to the existing cable television network. Standard modulators such as DMB/DAB) 305;
  • the function of the coordinated single frequency network adapter 301 is: adding a regional frequency correspondence table to the terrestrial digital broadcasting single frequency network; and transmitting the transmission stream from other networks (such as the Internet, satellite digital television broadcasting network) or content provider according to wireless transmission. Grouping is required, and the packets are multiplexed according to the capacity of the cable channel;
  • the DVB-T/H modulator (which may also be a modulator of other OFDM-based broadcast standards, such as DMB/DAB) 305 determines its own operating frequency according to its location and the region-frequency correspondence table carried in the TS stream. Transmit power
  • the pre-content server 402 is configured to store content that needs to be transmitted through the DVB-T/H modulator 305, such as predetermined broadcast content or content with high download frequency.
  • the introduction of the pre-content server 402 enables the network to upload predetermined broadcast content and content with high download frequency by using the idle period.
  • the pre-uploaded content service mode can fully utilize the HFC spectrum of the idle period, and can avoid HFC bandwidth is used to repeat the same content during busy hours.
  • pre-content server 402 An important way of information service is to achieve high-speed download of content.
  • a system structure such as pre-content server 402 can be added to the network.
  • the pre-content server 402 is set at the forefront of the network (at the access point), and the content with high frequency is pre-stored by the pre-content server 402 to reduce the real-time demand for bandwidth from a statistical point of view.
  • those pre-planned multimedia broadcast content can also be uploaded to the pre-content server 402 by uploading during the idle time period.
  • the system composition of the pre-content server 402 (and or 401) of the convenient content service (download, on-demand, etc.) given by the present invention is shown in Fig. 4.
  • the pre-content server 401 and/or 402 obtains content information and control commands sent by the network through the QAM demodulator 303 or through the demultiplexer 307, and the content thereof passes through the DVB-T/H modulator (may also be other A modulator of the OFDM-based broadcast standard, such as DMB/DAB) 305, transmitter 306 sends it to its service area, which may be a video request transmission, a data file download, or a predetermined broadcast transmission.
  • the single frequency network synchronization unit 304 pairs DVB-T/H Modulator 305 implements the synchronous control required for single frequency network operation.
  • the method for synchronizing the DVB-T/H modulator 305 is:
  • the single frequency network synchronization unit 304 is based on the single frequency network synchronization information carried in the MPEG-2 transport stream (inserted by the coordinated single frequency network adapter 301), such as transmitting a megaframe.
  • the start time is relative to the amount of delay of the GPS second pulse, the modulation mode of the DVB-T/H modulator 305, the frequency offset of the transmitter 306, etc., and the single frequency network synchronization unit 304 extracts the time and frequency reference signals from the GPS. To achieve.
  • the maintenance of the content of the pre-content server 401/402 is divided into regular maintenance and instant maintenance, for example, uploading new content to the content server 401/402, cleaning out outdated content, and checking the consistency of the content.
  • the network side establishes a content mirroring list and a content mirroring database for the content of each pre-content server, and the content mirroring database stores the union of the content of each pre-content server.
  • the network side loads the pre-content server 401/402 in a variety of ways: 1) content-based content loading; 2) statistical-based loading, ie, historical statistical results of content service classes based on the location of the pre-content server, loading, The content class that retains the demand; 3) Instant loading, when it is determined that the pre-content server does not pre-store the content requested by the user, the repeater stores the content in the front-end while forwarding the content sent by the base station to the user.
  • the pre-content server ie, historical statistical results of content service classes based on the location of the pre-content server, loading, The content class that retains the demand
  • Instant loading when it is determined that the pre-content server does not pre-store the content requested by the user, the repeater stores the content in the front-end while forwarding the content sent by the base station to the user.
  • the network side can load the pre-content server 401/402 within a certain time, such as during communication idle period, one case is when the night communication service is idle; or can be loaded in real time, such as live broadcast and burst data loading.
  • the downlink channel of the HFC-type cable television network is a broadcast channel.
  • the HFC-type network has a bandwidth of several hundred megahertz, after performing content services with large bandwidth requirements such as digital TV broadcasting and video on demand on the HFC network.
  • the bandwidth of HFC is still tight.
  • a broadcast method for pre-planned broadcast content is:
  • the pre-planned content includes: the content of the terrestrial television broadcast program that needs to be broadcasted in a specific time in the future, such as the morning of the second day. Broadcast news content;
  • the pre-stored content for broadcasting can also be used to download the service, and the single frequency network can be removed when downloading. Synchronization information.
  • the pre-content servers 401 and 402 transmit the pre-stored program content in a strict time rhythm according to the synchronization control information carried by the TS stream according to the predetermined time; when the pre-stored content is to be broadcasted by the terrestrial digital broadcasting network
  • the TSs are identical (including the single-frequency network synchronization information is also completely consistent), it constitutes the coordinated transmission of the cable television network and the terrestrial digital broadcasting network.
  • the pre-content server 401 and/or 402 flexibly selects the airing time and the broadcast mode under the control of the network (for example, performing periodic round-tripting.
  • the method of inserting cooperative transmission assistance information includes the following steps:
  • Step 501 obtaining a priori information
  • the coordinated single frequency network adapter 301 plans a digital broadcast transmitter connected to the HFC network in a specific area according to the correspondence between the frequency of the terrestrial digital broadcast network and the geographical area, such as the transmitter 306 conforming to the DVB-T/H standard. working frequency.
  • the system Before the cooperative single-frequency network adapter 301 performs the insertion of the coordinated transmission auxiliary information, the system must obtain the a priori information of the coverage area of the single-frequency network and the multi-frequency network, and a way to obtain the information is: at the head end of the cable television network (Head Ead) The planning data for storing terrestrial digital broadcasting networks.
  • Head Ead The planning data for storing terrestrial digital broadcasting networks.
  • the operator has already made clear plans for the channels (carriers) that can be used in the wireless extension of the cable television networks in different geographical areas, the number of sets of programs transmitted by each carrier, and the coding and modulation modes. And predetermining which of the total number of programs transmitted in a coaxial cable channel and which needs to be transmitted to the wireless extension.
  • the a priori information also includes program multiplexing information, and the program multiplexing information can be obtained through the program auxiliary table PAT;
  • Step 502 business classification
  • Collaborative single frequency network adapter 301 classifies services within the TS stream
  • the classification method is: According to the network information table NIT (network information table) carried by the TS code stream, 1) distinguishes: the code stream of the terrestrial digital television broadcasting single frequency network; 2) the code stream from the satellite network; 3) from other networks Network code stream (such as INTENET, etc.);
  • NIT network information table
  • Step 503 insert cooperative transmission auxiliary information
  • the method for adding the auxiliary stream information to the transport stream TS is as follows: 1) If the code stream already carries the single-frequency network synchronization information, the area-frequency correspondence table is added to the transport stream TS.
  • the area-frequency describes the center and radius of the area using a particular channel (carrier);
  • a regional frequency correspondence table may have multiple regional centers and regional radii in order to construct a flexible coverage area shape
  • the power control parameter is added to the transport stream TS; 2) if there is no single-frequency network synchronization information in the code stream, the single-frequency network synchronization information and the area-frequency correspondence table are added to the transport stream TS, However, if it is a TS transport stream from a terrestrial digital broadcast multi-frequency network and there is no single-frequency network synchronization information, one method is: As a non-cooperative single-frequency network processing, the inserted frequency information should be ensured to be different from the terrestrial digital broadcast multi-frequency network.
  • another processing method is to insert a region-frequency correspondence table and autonomous synchronization control information into the transmission code stream, so that the terrestrial digital broadcast code stream transmitted through the HFC is measured at the location
  • the time relationship of the obtained terrestrial digital broadcast signals is used to achieve synchronization of the GPS-free signals. See step 3).
  • the area-frequency describes the center and radius of the area using a particular channel (carrier);
  • a regional frequency correspondence table may have multiple regional centers and regional radii in order to construct a flexible coverage area shape
  • power control parameters are added to the transport stream TS; for code streams from other networks (such as satellite, INTENET, etc.), according to the number of programs transmitted by predetermined air interfaces, these programs need to be in the air.
  • the content sent is divided into several wireless channel groups (programs in the same wireless channel group are transmitted in the same wireless channel);
  • a power control parameter is added to the transport stream TS; Step 504, an HFC channel adaptation process;
  • multiple wireless channel groups are multiplexed into one wired channel for transmission;
  • the following is a further example of a mobile TV service coordinated by a cable television network and a terrestrial digital broadcasting network:
  • the cable television network Since the cable television network has become the most abundant network, if the rich content of the cable television network is radiated from the coaxial cable to the space in accordance with the DVB-H standard air interface signal, the indoor and outdoor coverage of the mobile TV signal can be realized.
  • FIG. 1 A system in which a cable television network cooperates with a terrestrial digital broadcasting network to provide a mobile TV service is shown in FIG.
  • the TS of the terrestrial digital mobile broadcast network DVB-H, and other content from other networks formed by the format conversion processing to form the DVB-H format, such as the MPEG-2 TS of the satellite, are subjected to the DVB-H format.
  • the conversion is distributed by the network to various DVB-H modulators and transmitters arranged indoors and outdoors.
  • Each DVB-H modulator follows the synchronization information and transmission parameter signaling (TPS) in the JACKET in the JACKET.
  • TPS transmission parameter signaling
  • the TS is modulated and then sent through the transmitter to the area that needs to be covered.
  • the cable television network and the terrestrial digital broadcasting network cooperate to provide a mobile TV service system for: 1) enhancing the intensity and coverage uniformity of the terrestrial digital mobile TV broadcast signal, and realizing the coverage of the cable television signal indoors and outdoors; 2) enabling The cable TV network can efficiently support content downloading services through mobile phones; 3) mobile TV can receive satellite TV broadcast content through DVB-H receiving front end; 4) mobile TV can receive Internet content through DVB-H receiving front end;
  • the present invention provides a wired and wireless coordinated integrated service system structure, which is characterized by introducing a cooperative single frequency network adapter and DVB-T/ required for constructing a single frequency network in an existing cable television network.
  • H modulator a wired and wireless cooperative digital broadcast method according to the present invention, characterized in that the content of the cable digital broadcast is synchronously transmitted to a specific area through an air interface by inserting cooperative transmission auxiliary information to form a single Frequency network.
  • the invention provides a method for inserting coordinated transmission auxiliary information, which is characterized in that a correspondence table between a geographical area and a transmission frequency is inserted in a digital television transmission stream, so that a wireless coverage area formed by the cable television network and the area on the area are The operating frequency is flexibly controlled.
  • the system and method of the invention can realize wireless coverage of a cable television broadcast signal to the room, and can also realize wireless coverage of the cable television broadcast signal to the outdoor; the same frequency transmission of the terrestrial digital broadcast network can be realized by using the cable television network, Improve the coverage of terrestrial digital broadcast signals, and also enable content download.
  • the invention provides a technical way for the cable television network to evolve into a wireless integrated service network, which is easy to implement.
  • the invention radiates the rich content of the line television network from the coaxial cable to the space, and the extension adopts the transmission form of the single frequency network, which can efficiently use the spectrum of the terrestrial television broadcasting and realize the cooperation with the terrestrial digital broadcasting network.
  • the invention realizes a wired and wireless coordinated broadcast network based on the cable television network, and the wired and wireless coordinated broadcast network realizes: 1) enhancing the intensity and coverage uniformity of the terrestrial digital television broadcast signal; 2) using the cable television The signal is expanded from the TV socket to the space to achieve indoor and outdoor coverage of the cable television signal; 3) enabling the cable television network to efficiently support the content download service and the scheduled content of the broadcast service; 4) while achieving the above effects, new The system remains fully compatible with existing cable TV systems.
  • the method of the present invention is suitable for the technical field in which a cable television network cooperates with a terrestrial digital broadcasting network, and the method of the present invention is equally suitable for other fields in which similar applications exist.

Landscapes

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

Abstract

L'invention concerne une structure de système de diffusion combinée destinée à combiner la partie câblée et la partie radio et un procédé associé. Selon l'invention, l'adaptateur de réseau monofréquence combiné (301), le récepteur GPS (302), le démodulateur et le démultiplexeur QAM (303), l'unité de synchronisation de réseau monofréquence (304), le modulateur (305), le transmetteur (306) et l'unité de démultiplexage (303) sont additionnés au réseau TV câblé existant; l'adaptateur de réseau monofréquence combiné (301) classe les flux de transmission provenant des différents réseaux et additionne la relation correspondante 'zone-fréquence' aux flux de transmission envoyés dans l'espace au moyen du modulateur (305) et du transmetteur (306); le démodulateur et le démultiplexeur QAM (303) décomposent un groupe de flux de transmission correspondant à un canal de diffusion sans-fil à partir des flux de transmission; le transmetteur (306) transmet les flux de transmission correspondant au canal de diffusion TV numérique terrestre à la zone de service correspondante de telle manière que le réseau TV câblé et le réseau de diffusion TV numérique terrestre peuvent combiner la transmission; et la couverture du réseau de diffusion TV numérique terrestre est améliorée au moyen du même signal émis par le réseau TV câblé vers l'espace avec le signal transmis par le canal de diffusion TV numérique terrestre.
PCT/CN2006/000673 2006-04-14 2006-04-14 Structure de système de diffusion combinée destinée à combiner la partie câblée et la partie radio et procédé associé WO2007118347A1 (fr)

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PCT/CN2006/000673 WO2007118347A1 (fr) 2006-04-14 2006-04-14 Structure de système de diffusion combinée destinée à combiner la partie câblée et la partie radio et procédé associé
CN200680052610XA CN101371576B (zh) 2006-04-14 2006-04-14 有线与无线协同的协同广播系统结构及其方法

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PCT/CN2006/000673 WO2007118347A1 (fr) 2006-04-14 2006-04-14 Structure de système de diffusion combinée destinée à combiner la partie câblée et la partie radio et procédé associé

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CN108259935A (zh) * 2016-12-29 2018-07-06 北京酷我科技有限公司 一种网页显示系统及方法
CN112653479A (zh) * 2020-12-16 2021-04-13 重庆邮电大学 一种支持单频网功能的DMB基带SoC
CN113301270A (zh) * 2021-05-24 2021-08-24 北京壹思达惟信息技术有限公司 一种云转播信号同步传输的系统及方法

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US8989083B2 (en) * 2011-03-01 2015-03-24 Broadcom Corporation Conditional access system for satellite outdoor unit
CN109981514B (zh) * 2019-02-19 2021-11-19 重庆邮电大学 一种基于局域网的小区dmb单频网实现方法

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CN108259935A (zh) * 2016-12-29 2018-07-06 北京酷我科技有限公司 一种网页显示系统及方法
CN108259935B (zh) * 2016-12-29 2021-07-09 北京酷我科技有限公司 一种网页显示系统及方法
CN108055097A (zh) * 2018-01-17 2018-05-18 北京牡丹电子集团有限责任公司数字电视技术中心 数字电视地面广播系统及其组建方法
CN112653479A (zh) * 2020-12-16 2021-04-13 重庆邮电大学 一种支持单频网功能的DMB基带SoC
CN113301270A (zh) * 2021-05-24 2021-08-24 北京壹思达惟信息技术有限公司 一种云转播信号同步传输的系统及方法
CN113301270B (zh) * 2021-05-24 2023-03-21 北京壹思达惟信息技术有限公司 一种云转播信号同步传输的系统及方法

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