WO2007118347A1 - A cooperate broadcast system structure for cooperate the wire and wireless and a method thereof - Google Patents
A cooperate broadcast system structure for cooperate the wire and wireless and a method thereof Download PDFInfo
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- 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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- 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.
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Abstract
A cooperate broadcast system structure for cooperating the wired and wireless and a method thereof, the structure comprises: adds the cooperate single frequency network adapter (301), GPS receiver (302), QAM demodulation and de-multiplexer (303), single frequency network synchronization unit (304), modulator (305) and transmitter (306), de-multiplexer (303) unit in the existed wired TV network; the cooperate single frequency network adapter (301) classes the transmit streams which are from the different network, and adds the “area-frequency” corresponding relation in the transmit streams which is send to the space by using the modulator (305)and the transmitter (306); QAM demodulation and de- multiplexer (303) decomposes a group of transmit streams corresponding to a wireless broadcast channel from the transmit streams; the transmitter (306)transmits the transmit streams corresponding to the land digital TV broadcast channel to the corresponding service area, so that the wired TV network and the land digital TV broadcast network can cooperate transmit, and the mantle of the land digital TV network is improved by the same signal eradiated by the wired TV network to the space with the signal transmitted by the land digital TV broadcast channel.
Description
有线与无线协同的协同广播***结构及其方法 技术领域 Wired and wireless coordinated collaborative broadcast system structure and method thereof
本发明涉及通信领域, 尤其涉及有线电视网与地面数字广播网的协同结构 和方法。 背景技术 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
目前的有线电视网 (HFC: 光纤同轴电缆混合网, xPON: 无源光网络) 已 经融合了广播业务 (地面无线、 地面有线和卫星广播业务)、 电话业务、 互联 网业务的融合, 有线电视网已经成为内容最为丰富的网络。 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.
有线数字电视采用的主流技术是 DVB-C标准, DVB-C采用 MPEG- 2压缩编码 的传输流, 传输媒介采用的是同轴线。 DVB- C调制方式一般为 64-QAM方式, 有时也可以采用 16- Q細, 32- QAM或更高的 128 - QAM, 256- QAM。 在一个 8MHz 标准电视频道内, 如果使用 64- QAM, 所传输的数据速率为 38. 5Mb/s。 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. In an 8MHz standard TV channel, if 64-QAM is used, the data rate transmitted is 38.5 Mb/s.
地面数字广播的标准有多种,其中基于 OFDM (正交频分复用)调制技术的 数字电视传输标准有 DVB- T/H (欧洲),ISDB (日本), DMB (清华)。 虽然这些 地面数字广播标准尽管在传输方式上各不相同, 但是都是采用 MPEG-2数字音 频、 视频压縮编码的传输流。 这些标准采用的 C0FDM (编码的正交频分复用) 调制方式引入了传输 "保护间隔"来避免多径效应。 基于 OFDM的数字广播标 准既可以组建多频网 (MFN), 也可以组建单频网 (SFN)。 There are various standards for terrestrial digital broadcasting, and digital television transmission standards based on OFDM (Orthogonal Frequency Division Multiplexing) modulation technology include DVB-T/H (Europe), ISDB (Japan), and DMB (Tsinghua). Although these terrestrial digital broadcasting standards differ in transmission methods, they are transmission streams using MPEG-2 digital audio and video compression coding. The C0FDM (Coded Orthogonal Frequency Division Multiplexing) modulation scheme used by these standards introduces a transmission "guard interval" to avoid multipath effects. Digital broadcast standards based on OFDM can be used to build a multi-frequency network (MFN) or a single frequency network (SFN).
现有地面数字广播***既有多频网也有单频网, 多频网的组网和模拟电视 广播相似,不同的发射机使用不同的载波发送广播信号,不同发射机之间的内 容可以是相同的也可以是不同的,发射机之间不要求严格的同步关系。现有的 地面数字广播单频网要求不同位置的各个发射机之间必需保持严格的时间同 步、 频率同步和比特同步。 图 1是地面数字广播单频的组成, 包括再复用器 101、 单频网适配器 102、 GPS时钟 103、 发送端网络适配器 104、 分配网 105、 接收端网络适配器 106、 同步单元 107、 DVB- T/H调制器 108。其中, 再复用器 101用于不同节目的复用, 形成一路(在同一个载频上)发送的 MPEG- 2传输 流 TS (Transport Streams) , 单频网适配器 102用于对 TS码流***单频网正 常工作所需要的同步信息, GPS时钟 103为单频网适配器 102和 DVB-T/H调制
器 108提供时间基准, 发送端网络适配器 104和接收端网络适配器 106用于 MPEG— 2码流 TS在分配网上的透明传输, 分配网 105可以是多种形式的网络, 如 SDH(Synchronos Digital Hierarchy, 同步数字系列)、 以太网等, 同步单 元 107用于各个发射机之间的同步发射, 把传输流 TS携带的同步时间信息与 GPS时间相对比确定发射时机, DVB-T/H调制器 108在同步单元 107的同步下, 按照传输流 TS携带的编码控制信息对传输流 TS进行 OFDM调制。 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. 1 is a composition of a terrestrial digital broadcast single frequency, including a remultiplexer 101, a single frequency network adapter 102, a GPS clock 103, a sender network adapter 104, a distribution network 105, a receiver network adapter 106, a synchronization unit 107, and a DVB- T/H modulator 108. 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. Synchronization information required for normal operation of a single frequency network, 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.
有线电视网也可以采用多种传输媒介,如 HFC、 EP0N (以太无源光网络)等, 不同的有线电视网在组成上是相似的, 这里对最为普遍的 HFC网进行说明, EP0N等其它形式的有线电视网和 HFC的具有相似的拓扑形式和网元。 图 2是 一个 SDH (Synchronous Digital Hierarchy,同步数字体系)分配网禾口 HFC网组 成的有线电视网, 包括: 再复用器 201、 QAM调制器 /混合器 202/208、 发送端 网络适配器 203、 SDH网 204、 HFC网 205/209、 机顶盒 206、 接收端网络适配 器 207。 再复用器 201接收来自不同网络和 MPEG- 2编码器的 TS码流, 对其再 复用后, 一方面直接送到本地 QAM调制器 /混合器 202 (按照 DVB- C标准), 对 本地的 HFC网 205进行 DVB- C标准的广播,广播信号经机顶盒 206解调、解复 用之后, 形成视频、音频码流送到电视接收机; 另一方面, 经过发送端网络适 配器 203、 SDH网 204、 接收端网络适配器 207送到远端的 HFC网 209, 经过 QAM调制器 /混合器 208的调制 (按照 DVB-C标准), 送到机顶盒 206。 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. 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. On the other hand, 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.
目前的有线电视用户可以在家里收看电视、 DVD/VCD点播、 互联网浏览、 收发电子邮件、拨打可视电话, 以及进行在线游戏、远程学习和咨询、进行在 线商务活动。 从网络演进的角度看, PHS (Personal Handphone System, 小灵 通)是公共电话网向无线的延伸, WIMAX (Worldwide Interoperability for Microwave Access, 微波存取全球互通)和 WLAN (无线局域网)是互联网向无线 的延伸, 同样地, 融合了诸多业务的有线电视网也需要向无线延伸。这种延伸 不但可以解决内容的移动接收,还可以解决地面数字广播网的覆盖问题,进一 步地,可以充分发掘移动终端的数字电视接收机的潜力,使之不仅仅是一个电 视接收机, 而是一个综合实现电视接收、 数据下载、 数据通信的功能单元。 Current cable TV users can watch TV, DVD/VCD on demand, Internet browsing, send and receive emails, make video calls, and conduct online games, distance learning and consulting, and conduct online business activities. From the perspective of network evolution, PHS (Personal Handphone System, PHS) is an extension of the public telephone network to wireless. WIMAX (Worldwide Interoperability for Microwave Access) and WLAN (Wireless Local Area Network) are Internet-to-wireless. Extensions Similarly, 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.
有线电视网向无线延伸 (有线无线协同) 的现有技术有专利申请 Patent application for cable TV network to wireless extension (wired and wireless collaboration)
US20060029090,名称为"光纤同轴混合 (HFC)网中通信信号的分配方法 (Method and system for distributing wireless communication signals in an HFC
network)", 该专利申请描述的通信***是: 在 HFC网中加入若干个无线接点 (the wireless interface nodes) 和一个位于 HFC头端位置的无线通信协议 控制器。所述无线通信协议控制器连接位于头端位置的电缆调制解调器终端系 统(CMTS: Cable Modem Termination System)和 HFC网络, 并在 CMTS和 HFC 网络之间进行协议转换,如,把 MPEG- 2传输协议转换为无线通信***的协议。 无线接点对器接收到的上行信号进行下变频到 HFC的上行频带内,无线接点对 要发送的下行信号进行上变频到无线通信装置使用的频带内。进一步地,本发 明指出这里的无线***协议是指 WIMAX协议。 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 Cable Modem Termination System (CMTS) at the head end and the HFC network, and protocol conversion between the CMTS and the HFC network, such as the protocol for converting the MPEG-2 transmission protocol into a wireless communication system. 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. Further, the present invention indicates that the wireless system protocol herein is Refers to the WIMAX protocol.
现有的有线电视广播网的缺点是其内传输的信号无法被无线通信装置直 接接收, 限制了有线电视内容的接收范围;现有地面数字广播的信号难以实现 室内覆盖、 也很难对室外覆盖产生均匀、 足够的信号强度, 并且节目套数少; 专利申请 US20060029090给出的技术虽然可以通过 HFC网提高无线通信***的 信号覆盖,但是占用了 HFC网的广播业务频带,也无法产生改善地面数字广播 覆盖质量的效果。 发明公幵 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
本发明所要解决的技术问题是提供一种有线与无线协同的协同广播*** 结构及其方法,解决现有技术不能把有线电视网丰富的内容从同轴电缆内辐射 到空间, 不能实现与地面数字广播网的协同的技术问题。 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.
为实现上述发明目的, 本发明提供了一种有线与无线协同的协同广播*** 结构, 其特点在于, 包括: 在现有有线电视网中增加协同单频网适配器和 GPS 接收机,在有线电视网的 HFC子网上增加顺序联接的 QAM解调和解复用、连接 GPS接收机的单频网同步单元、 调制器和发射机; 在连接 SDH网的接收端网络 适配器上增加顺序联接的解复用单元、连接 GPS接收机的单频网同步单元、调 制器和发射机; 所述协同单频网适配器对来自不同网络的传输流进行分类处 理, 并对需要使用调制器和发射机向空中发射的传输流加入 "区域一频率"对 应关系;所述 QAM解调和解复用用于从所述传输流分解出和一个无线广播频道 对应的一组传输流;所述解复用单元用于从所述传输流分解出和一个无线广播 频道对应的一组传输流; 所述调制器用于根据自己的位置和传输流中携带的 "区域一频率 "对应关系确定自己的工作频率、发射功率; 所述发射机用于将
和地面数字电视广播频道对应的传输流发送到对应的服务区域,从而将有线电 视网对地面数字电视广播网协同发射,利用有线电视网向空间辐射的和地面数 字电视广播频道发射的完全相同的信号, 来改善地面数字电视网的覆盖。 To achieve the above object, 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. a single frequency network synchronization unit, a modulator, and a transmitter connected to the GPS receiver; 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.
上述的协同***, 其特点在于, 所述协同单频网适配器进行的分类处理包 括:确定传输流是否已经携带单频网同步信息;确定送往 HFC网络的传输流中 需要加入单频网同步信息的节目码流, 并对应加入单频网同步信息。 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.
上述的协同***, 其特点在于, 所述协同单频网适配器还根据需要信号在 MPEG- 2传输流中加入同步质量测量和信号幅度测量控制信息, 以保障单频网 工作稳定。 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.
上述的协同***, 其特点在于, 所述单频网同步信息包括: 不同码流或者 码流组在不同的地理空间上使用的频率,以及所述协同单频网适配器为不同的 传输流***的对应的单频网或者其对应的多频网中的一个频点所覆盖的区域 息 The cooperative system described above is characterized in that: 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 covered by one frequency point in the corresponding single frequency network or its corresponding multi-frequency network
上述的协同***, 其特点在于, 所述区域信息为发射机的位置座标和覆盖 半径,不同位置的调制器和发射机根据所述区域信息来确定应该采用的工作频 点, 调制器和发射机的位置为预先设置或者通过安装 GPS接收机获取。 The cooperative system described above is characterized in that: 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.
上述的协同***, 其特点在于, 所述调制器为 DVB-T/H调制器或基于正交 频分复用广播标准的 DMB/DAB调制器。 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.
上述的协同***, 其特点在于, 所述单频网同步单元使用的时间基准取自 GPS接收机或取自 HFC网内提供的时间基准。 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.
上述的协同***, 其特点在于, 还包括前置内容服务器, 所述前置内容服 务器连接所述 QAM解调和解复用、 单频网同步单元; 和 /或所述前置内容服务 器连接所述解复用单元、单频网同步单元;所述前置内容服务器用于对需要通 过调制器发送的预定内容进行存储。 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.
上述的协同***, 其特点在于, 网络利用空闲时段对所述预定内容进行上 载,从而充分利用空闲时段的 HFC频谱,避免在业务繁忙时段内使用 HFC带宽 对相同的内容重复传送。 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.
上述的协同***, 其特点在于, 所述预定内容包括: 预定的广播内容和 / 或下载频度高的内容。 The above-mentioned collaborative system is characterized in that the predetermined content includes: predetermined broadcast content and/or content with high download frequency.
上述的协同***, 其特点在于, 网络中建立有各前置内容服务器的内容镜
像清单和内容镜像数据库,所述内容镜像数据库里面存储各个前置内容服务器 内容的并集; 网络对前置内容服务器的内容进行定期维护或即时维护,用以上 载新的内容、 清理过时的内容以及进行内容一致性的检査。 The above-mentioned collaborative system is characterized in that a content mirror of each pre-content server is established in the network. Like the manifest and content mirror database, 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.
上述的协同***, 其特点在于, 网络对所述预定内容进行基于计划加载、 基于统计加载或即时加载,对普通数据的预定内容在通讯空闲期加载,对实况 转播和突发新闻数据的预定内容进行实时加载。 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.
为了更好的实现本发明的目的, 本发明还提供了一种根据上述的协同*** 进行协同广播的方法, 其特点在于, 包括: In order to better achieve the object of the present invention, the present invention further provides a method for cooperative broadcast according to the foregoing coordinated system, which is characterized in that it comprises:
步骤一, 把预播出的节目内容预先存储在所述前置内容服务器内, 并且预 存的节目内容是加入单频网同步控制信息的传输流; 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;
步骤二, 把播出的预定时间信息预存到所述前置内容服务器内; Step 2: pre-storing the broadcasted scheduled time information into the pre-content server;
步骤三, 所述前置内容服务器按照所述预定时间, 或者所述前置内容服务 器在接收到拨出控制信号之后,调制器根据传输流携带的同步控制信息, 以严 格的时间节奏发送所述预存的节目内容,以保障所述预存的节目内容是地面数 字广播网要播出的单频网同步信息完全一致的完全相同的传输流,从而构成了 有线电视网与地面数字广播网的协同发射。 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. .
上述的协同广播的方法, 其特点在于, 所述预播出的节目内容为在未来特 定时间内需要播出的地面电视广播节目的内容,所述预播出的节目内容还用于 下载服务,在下载时去掉单频网同步信息;所述前置内容服务器对于独立广播 的内容或者用于下载的内容, 在网络的控制下灵活选择播出时间、 播出方式。 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.
为了更好的实现本发明的目的, 本发明还提供了一种根据上述的协同*** 实现协同发射辅助信息的方法, 其特点在于, 包括: In order to achieve the object of the present invention, 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:
步骤 A, 协同单频网适配器获取网络覆盖的先验信息; Step A: Cooperating with the single frequency network adapter to obtain a priori information of the network coverage;
步骤 B, 协同单频网适配器对传输流内的业务进行分类; Step B: Cooperating with the single frequency network adapter to classify services in the transport stream;
步骤 C, 协同单频网适配器对传输流加入辅助信息; Step C: Cooperating with the single frequency network adapter to add auxiliary information to the transport stream;
步骤 D, 进行 HFC频道的适配处理。 Step D: Perform adaptation processing of the HFC channel.
上述的协同发射辅助信息的方法, 其特点在于, 通过在有线电视网的头端 中存储地面数字广播网的规划数据, 来获取所述先验信息。 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.
上述的协同发射辅助信息的方法, 其特点在于, 所述规划数据包括: 运营 商对各个不同地理区域上的有线电视网向无线延伸中可以使用的频道 \载波、
每个载波传输的节目套数和编码调制方式的预先明确规划信息,以及预先确定 的在一个同轴电缆频道内传输的节目总套数中需要向无线延伸发送的节目套 数信息。 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.
上述的协同发射辅助信息的方法, 其特点在于, 所述先验信息还包括节目 复用信息, 并通过节目辅助表来获取所述节目复用信息。 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.
上述的协同发射辅助信息的方法, 其特点在于, 所述步骤 B中所述分类是 根据传输流携带的网络信息表区分出: 来自地面数字电视广播单频网的码流、 来自卫星网的码流和 /或来自因特网的码流。 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.
上述的协同发射辅助信息的方法, 其特点在于, 在所述步骤 C中, 如果传 输流中已经携带单频网同步信息,则在传输流中加入区域一频率对应表;所述 区域一频率对应表描述使用特定频道\载波的区域的中心和半径; 一个区域频 率对应表中可以有多个区域中心和区域半径, 以便构造出灵活的覆盖区域形 状。 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.
上述的协同发射辅助信息的方法, 其特点在于, 还包括: 在传输流中加入 功率控制参数, 以便控制覆盖范围。 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.
上述的协同发射辅助信息的方法, 其特点在于, 在所述步骤 c中, 如果传 输流中没有单频网同步信息,则在传输流中加入单频网同步信息和区域一频率 对应表;并且,如果是来自地面数字广播多频网的传输流并且没有单频网同步 信息, 则按以下两种方式处理: 方式一: 作为非协同单频网处理, ***的频率 信息确保和地面数字广播多频网不同, 以避免对地面数字广播网的干扰;方式 二: 向传输流中***区域一频率对应表和自主同步控制信息,使通过 HFC传输 后的地面数字广播码流以起所在位置测量得到的地面数字广播信号的时间关 系来实现无 GPS信号的同步。 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.
上述的协同发射辅助信息的方法, 其特点在于, 对来自非有线电视网络的 码流,根据预先确定的空口传输的节目数量,把这些节目中需要向空中发送的 内容划分为若干个无线频道组,同一无线频道组内的节目在同一个无线频道内 传送;对每组节目加入无线传输所需要的传输参数信令和构建单频网所需要的 巨帧初始化参数包同步信息; 对每组节目的传输流中加入区域一频率对应表。 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.
上述的协同发射辅助信息的方法, 其特点在于, 所述非有线电视网络为卫 星信号网或因特网。
上述的协同发射辅助信息的方法,其特点在于,在步骤 D中,如果一个 HFC 的有线频道的容量可以传送多个无线频道组,就将多个无线频道组复用到一个 有线信道内传输。 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.
为了更好的实现本发明的目的, 本发明还提供了一种 据上述的协同*** 实现有线电视网与地面数字广播网协同提供手机电视业务的方法, 其特点在 于, DVB-H格式的传输流被网配送到布置在室内和室外的各个 DVB- H调制器和 发射机,各个 DVB-H调制器按照传输中巨帧初始化参数包中的同步信息和传输 参数信令对传输流进行调制, 然后通过发射机发送到需要覆盖的区域。 In order to better achieve the object of the present invention, 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.
上述的有线电视网与地面数字广播网协同提供手机电视业务的方法, 其特 点在于,所述 DVB- H格式的传输流包括:地面数字手机广播网的 DVB- H格式的 传输流, 以及经过格式变换处理形成的 DVB-H格式的传输流。 The foregoing 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 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.
上述的有线电视网与地面数字广播网协同提供手机电视业务的方法, 其特 点在于, 所述经过格式变换处理形成的 DVB-H格式的传输流为卫星的 MPEG - 2 传输流经过 DVB-H格式转换形成。 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.
本发明的优点在于: 本发明把线电视网丰富的内容从同轴电缆内辐射到空 间,并且这种延伸采用单频网的发射形式,既可以高效使用地面电视广播的频 谱, 又可以实现与地面数字广播网的协同。本发明的以有线电视网为依托, 构 建一个有线无线协同的广播网, 这个有线无线协同的广播网实现了: 1 ) 增强 地面数字电视广播信号的强度和覆盖的均匀性; 2)将有线电视信号从 TV插座 扩大到空间, 实现有线电视信号对室内和室外的覆盖; 3 )使有线电视网可以 高效地支持内容下载业务和预定内容的广播业务; 4)在达到上述效果的同时, 新的***保持对现有有线电视***的完全兼容;使家用电视机可以灵活选择摆 放位置, 手机电视在室内外均可得到好的接收质量, 手机电视可以通过 DVB - H 接收前端来接收***广播内容。 附图简要说明 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. BRIEF DESCRIPTION OF THE DRAWINGS
图 1现有地面数字电视广播单频网结构; Figure 1 shows a conventional single-frequency network structure for terrestrial digital television broadcasting;
图 2现有有线电视广播网结构; Figure 2 shows the structure of the existing cable television broadcasting network;
图 3—种有线与无线协同的综合业务***结构; Figure 3 – Structure of an integrated service system that is wired and wireless;
图 4一种有线与无线协同的综合业务***结构;
图 5—种***协同发射辅助信息的方法 实现本发明的最佳方式 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
下面结合附图和实施例对本发明做进一步详细说明。 The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.
鉴于有线电视网已经成为内容最为丰富的网络, 如果把线电视网丰富的内 容从同轴电缆内辐射到空间,并且这种延伸采用单频网的发射形式,既可以高 效使用地面电视广播的频谱, 又可以实现与地面数字广播网的协同。 In view of the fact that 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, 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.
本发明的是以有线电视网为依托, 构建一个有线无线协同的广播网, 这个 有线无线协同的广播网用于: 1 )增强地面数字电视广播信号的强度和覆盖的 均匀性; 2)将有线电视信号从 TV插座扩大到空间, 实现有线电视信号对室内 和室外的覆盖; 3 )使有线电视网可以高效地支持内容下载业务和预定内容的 广播业务; 4)在达到上述效果的同时, 新的***保持对现有有线电视***的 完全兼容; 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;
本发明具体包括 Al、 A2、 B、 C四个部分。 The invention specifically includes four parts of Al, A2, B, and C.
Al、 一种有线与无线协同的***结构 Al, a wired and wireless cooperative system structure
本发明所述有线与无线协同的综合业务***是在现有***, 见图 2, 的基 础上,增加了协同单频网适配器 301、 GPS接收机 302、 QAM解调和解复用 303、 单频网同步单元 304、 DVB-T/H调制器(也可以是其它基于 OFDM的广播标准的 调制器, 如 DMB/DAB) 305、 发射机 306、 解复用单元 307。 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 network synchronization unit 304, the DVB-T/H modulator (which may also be a modulator of other OFDM-based broadcast standards, such as DMB/DAB) 305, the transmitter 306, and the demultiplexing unit 307.
***中的协同单频网适配器 301对来自不同网络的传输流 TS分类处理, 如, 协同单频网适配器 301对传输流 TS是否已经携带单频网同步信息进行判 断, 对送往 HFC网络的传输流 TS中哪些节目码流需要加入单频网同步信息进 行判断, 并对需要加入单频网同步信息的 TS流, 加入单频网同步信息, 加入 的单频网同步信息包括:相对于 GPS秒脉冲的同步时间、不同码流或者码流组 在不同的地理空间上使用的频率。另外,协同单频网适配器 301还根据需要信 号在 MPEG-2传输流中加入同步质量测量和信号幅度测量控制信息, 以保障单 频网工作稳定。 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. In addition, 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.
协同单频网适配器 301在 GPS接收机 302提供的时间同步下, 对从再复用 器 201输入的 TS进行处理,目的是在 MPEG- 2传输流中加入单频网需要的同步 信息。 经过协同单频网适配器 301处理的 MPEG-2传输流可以采取两种传输方
式:一种是经过分配网(如 SDH网 204)送到解复用单元 307,解复用单元 307 从 MPEG- 2传输流中分解出需要通过发射机 306发射或者需要前置内容服务器 402存储的那部分码流。 发送端网络适配器 203、 接收端网络适配器 207用于 实现 MPEG- 2传输流在 SDH网 204中的透明传输; 一种方式是或者不经过分配 网, 直接送到 QAM调制器 /混合器 202, 然后再经过 HFC网送到 QAM解调和解 复用 303, QAM解调和解复用 303从一个 HFC载频上所承载的传输流中分解出 和一个无线广播频道相对应的一组 TS流(这组 TS流对应若干个可以在同一个 无线广播频率上发送的节目), 这组携带有由协同单频网适配器 301为其*** 的单频网同步信息的 TS传输流经过 DVB-T/H调制器(也可以是其它基于 OFDM 的广播标准的调制器, 如 DMB/DAB) 305、 发射机 306被发送到其服务的区域, 其中的在单频网同步单元 304对 DVB- T/H调制器的码流发送时刻实施同歩控 制。 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. (Alternatively, other OFDM-based broadcast standard modulators, such as DMB/DAB) 305, 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.
协同单频网适配器 301和现有单频网适配器 102的区别在于: 现有的单频 网适配器只是对再复用器 101送来的传输流 TS中加入同步信息 (通过在兆帧 初始化包 MIP里面加入相对于 GPS秒脉冲的的相对时间来实现), 而协同单频 网适配器 301除了现有的单频网适配器 102的功能之外,还需要实现对来自不 同网络的传输流 TS的分类处理, 如, 协同单频网适配器 301需要判断传输流 TS是否已经携带单频网同步信息、判断送往 HFC网络的传输流 TS中的哪些需 要加入单频网同步信息、判断传输流 TS中需要加入单频网同步信息的 TS流在 不同地理位置上需要采用的频率等,另外,协同单频网适配器 301还可以根据 测量的需要来加入对单频网的测量控制信息。 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) In addition to the relative time of the GPS second pulse, 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. For example, 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. In addition, the coordinated single-frequency network adapter 301 can also add measurement control information to the single-frequency network according to the measurement requirements.
单频网同步单元 304使用的时间基准可以取自 GPS接收机 302, 也可以取 自来自 HFC网内提供的时间基准。 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.
来自地面数字广播网的 TS CTi) , 无论是来自单频网还是来自多频网, 都 认为是其自身携带有单频网同步信息, 为了实现对地面数字广播网的 TS (l〜i) 的协同发射,协同单频网适配器 301为不同的 TS传输流插其对应的单频网(或 者其对应的多频网中的一个频点)所覆盖的区域,这些区域可以以多种形式表 示, 一种表示方法是在 TS传输流中***发射机的位置座标和覆盖半径, 不同 位置的调制器和发射机根据这一信息来确定自己应该采用的工作频点。调制器 和发射机的位置可以由预先设置, 也可以通过安装 GPS接收机获取。
本发明给出的一种有线和无线协同的广播***的特点是: 在现有有线电视 网中加入了协同单频网适配器 301、 DVB- T/H调制器(也可以是其它基于 OFDM 的广播标准的调制器, 如 DMB/DAB) 305 ; TS CTi) from the terrestrial digital broadcasting network, whether it is from a single frequency network or from a multi-frequency network, is considered to carry its own single-frequency network synchronization information, in order to achieve TS (l~i) to the terrestrial digital broadcasting network. Cooperative transmission, 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;
2、 协同单频网适配器 301的功能是: 对地面数字广播单频网加入区域频 率对应表; 对来自其它网络(如互联网、卫星数字电视广播网)或内容提供商 的传输流按照无线传输的要求进行分组、并且按照有线频道的容量对对这些分 组进行复接; 2. 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;
3、 DVB- T/H调制器 (也可以是其它基于 OFDM的广播标准的调制器, 如 DMB/DAB) 305根据自己的位置和 TS流中携带的区域一频率对应表确定自己的 工作频率、 发射功率; 3. 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
4、前置内容服务器 402用于对需要通过 DVB - T/H调制器 305发送的内容, 如预定的广播内容或者下载频度高的内容, 进行存储。 前置内容服务器 402 的引入使网络可以利用空闲时段对预定的广播内容和下载频度高的内容进行 上载,这种预先上载内容的服务方式既可以充分利用空闲时段的 HFC频谱,又 可以避免在业务繁忙时段内使用 HFC带宽对相同的内容重复传送。 4. 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.
A2、 一种有线与无线协同的综合业务***结构 A2. A wired and wireless coordinated integrated service system structure
信息化服务的一个重要方式是实现内容高速下载, 为了降低内容下载或者 多媒体广播服务对 HFC频谱的占用, 可以在网络中加入前置内容服务器 402 这样的***结构。 An important way of information service is to achieve high-speed download of content. In order to reduce the content of HFC spectrum consumed by content download or multimedia broadcast service, a system structure such as pre-content server 402 can be added to the network.
在网络的最前端 (接入点处)设置前置内容服务器 402, 通过前置内容服 务器 402预存那些需求频度高的内容,从统计角度降低对带宽的实时需求。另 夕卜,对那些预先计划好的多媒体广播内容也可以通过空闲时间段内上载的方式 上载到前置内容服务器 402。 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. In addition, those pre-planned multimedia broadcast content can also be uploaded to the pre-content server 402 by uploading during the idle time period.
本发明给出的方便内容服务 (下载、 点播等) 的前置内容服务器 402 (和 或者 401 ) 的***组成见图 4。 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.
前置内容服务器 401和 /或 402通过 QAM解调器 303, 或者通过解复用器 307来获取网络发来的内容信息和控制命令, 其内容通过 DVB - T/H调制器(也 可以是其它基于 OFDM的广播标准的调制器, 如 DMB/DAB) 305、 发射机 306发 送到其服务区域, 这种发送可以是视频请求发送, 也可以是数据文件下载, 也 可以是预定的广播发射。 在发送的过程中, 单频网同步单元 304对 DVB-T/H
调制器 305实施单频网工作所需要的同步控制。 单频网同步单元 304对 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. In the process of transmission, the single frequency network synchronization unit 304 pairs DVB-T/H Modulator 305 implements the synchronous control required for single frequency network operation. Single frequency network synchronization unit 304
DVB-T/H调制器 305实现同步的方法是: 单频网同步单元 304根据 MPEG- 2传 输流中携带的单频网同步信息 (由协同单频网适配器 301***), 如发送兆帧 的起始时刻相对于 GPS秒脉冲的时延量、 DVB- T/H调制器 305的调制方式、 发 射机 306的频偏等,都是由单频网同步单元 304从 GPS提取时间和频率基准信 号来实现的。 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.
对前置内容服务器 401/402的内容进行维护分为定期维护和即时维护,如, 向前置内容服务器 401/402上载新的内容、清理过时的内容、内容的一致性检 查。 网络侧为各个前置内容服务器的内容建立内容镜像清单和内容镜像数据 库, 内容镜像数据库里面存储各个前置内容服务器内容的并集。 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.
网络侧采取多种方式对前置内容服务器 401/402加载: 1 )基于计划的内 容加载; 2 )基于统计的加载, 即根据前置内容服务器所在位置的内容服务类 的历史统计结果, 加载、 保留需求量的的内容类; 3 ) 即时加载, 当确定前置 内容服务器内没有预存用户请求的内容时,中继器在向用户转发基站发来的内 容的同时, 把这些内容存储在前置内容服务器内。 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. Within the content server.
网络侧可以在特定时间内对前置内容服务器 401/402加载, 如通讯空闲期 间,一种情况是夜晚通讯业务空闲时; 也可以实时加载, 如实况转播和突发新 闻数据的加载 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.
B、 一种实现预设广播的方法 B. A method for implementing preset broadcast
HFC型有线电视网的下行信道是广播型信道, 虽然 HFC型网络具有几百兆 赫兹的带宽,但是,在 HFC网上开展了搞清晰度数字电视广播和视频点播等带 宽需求量大的内容服务之后, HFC的带宽仍然是紧张的, 为了节省 HFC型有线 电视网的传输带宽, 一种对预先计划的播出内容的广播方法是: The downlink channel of the HFC-type cable television network is a broadcast channel. Although 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. In order to save the transmission bandwidth of HFC-type cable TV network, a broadcast method for pre-planned broadcast content is:
1 )把预先计划播出的内容预先存储在前置内容服务器 401和 402内; 预先计划播出的内容包括: 在未来特定时间内需要播出的地面电视广播节 目的内容, 如第 2天早晨播出的新闻内容; 1) pre-planning the broadcasted content in the pre-content servers 401 and 402; 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;
对于需要实现预存内容和地面广播网的协同广播(以同频、 同时、 同比特 的方式与地面数字广播网协同发射) 的应用, 在预存的内容, 具有 MPEG-2传 输流的形式, 中加入单频网同步控制信息; For applications that need to implement co-broadcasting of pre-stored content and terrestrial broadcast networks (co-transmitted in the same frequency, simultaneous, and bit-wise manner with terrestrial digital broadcast networks), in the form of pre-stored content with MPEG-2 transport stream, join Single frequency network synchronization control information;
预存的用于广播的内容, 也可以用于下载服务, 在下载时可以去掉单频网
同步信息。 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.
2 )把广播内容的播出时间信息预存到前置内容服务器 401和 402内 2) pre-storing the broadcast time information of the broadcast content into the pre-content servers 401 and 402
3 )前置内容服务器 401和 402按照预定的时间, 调制器根据 TS流携带的 同步控制信息, 以严格的时间节奏发送预存的节目内容; 当预先存储的内容是 地面数字广播网要播出的完全相同 (包括单频网同步信息也完全一致) 的 TS 时, 就构成了有线电视网与地面数字广播网的协同发射。 3) 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 When 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.
对于独立广播的内容, 或者用于下载的内容, 前置内容服务器 401和 /或 402在网络的控制下灵活选择播出时间、 播出方式 (如进行周期循环拨出。 For the content of the independent broadcast, or the content for downloading, 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.
C、 一种***协同发射辅助信息的方法 C. A method for inserting cooperative emission assistance information
***协同发射辅助信息的方法包括如下步骤: The method of inserting cooperative transmission assistance information includes the following steps:
步骤 501, 获取先验信息; Step 501, obtaining a priori information;
获取网络覆盖的先验信息和每个频道内 MPEG-2传输流的节目复用信息。 为了使通过 HFC网络发射的地面电视广播信号和地面数字电视发射塔发射 的信号之间协同,需要预先知道地面数字电视广播网在特定地理区域内的频率 使用情况。协同单频网适配器 301根据地面数字广播网的频率和地理区域的对 应关系,来规划特定区域内和 HFC网相连接的数字广播发射机,如符合 DVB-T/H 标准的发射机 306, 的工作频率。协同单频网适配器 301在进行***协同发射 辅助信息之前, ***必须获得单频网、多频网的覆盖地理区域的先验信息, 一 种获取这些信息的途径是: 在有线电视网的头端(Head Ead) 中存储地面数字 广播网的规划数据。 Obtain a priori information of the network coverage and program multiplexing information of the MPEG-2 transport stream in each channel. In order to synchronize the terrestrial television broadcast signals transmitted over the HFC network with the signals transmitted by terrestrial digital television towers, it is necessary to know in advance the frequency usage of terrestrial digital television broadcasting networks in a particular geographic area. 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. 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.
运营商已经对各个不同地理区域上的有线电视网向无线延伸中可以使用 的频道(载波)、每个载波传输的节目套数、编码调制方式需要预先明确规划。 并且预先确定在一个同轴电缆频道内传输的节目总套数中、哪些是需要向无线 延伸发送的。 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.
先验信息还包括节目复用信息,可以通过节目辅助表 PAT来获取节目复用 信息; The a priori information also includes program multiplexing information, and the program multiplexing information can be obtained through the program auxiliary table PAT;
步骤 502, 业务分类; Step 502, business classification;
协同单频网适配器 301对 TS流内的业务进行分类 Collaborative single frequency network adapter 301 classifies services within the TS stream
分类方法是: 根据 TS码流携带的网络信息表 NIT (网络信息表) 区分出: 1 )地面数字电视广播单频网的码流; 2)来自卫星网的码流; 3 )来自其他网
络的码流(如 INTENET等); 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.);
步骤 503, ***协同发射辅助信息; Step 503, insert cooperative transmission auxiliary information;
协同单频网适配器 301对传输流为传输流 TS加入辅助信息的方法是: 1 )如果码流中已经携带单频网同步信息, 则传输流 TS中加入区域一频率 对应表, 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.
区域一频率描述使用特定频道(载波) 的区域的中心和半径; The area-frequency describes the center and radius of the area using a particular channel (carrier);
一个区域频率对应表中可以有多个区域中心和区域半径, 以便构找出灵活 的覆盖区域形状; A regional frequency correspondence table may have multiple regional centers and regional radii in order to construct a flexible coverage area shape;
进一步地, 为了控制覆盖范围, 在传输流 TS中加入功率控制参数; 2)如果码流中没有带单频网同步信息, 则传输流 TS中加入单频网同步信 息和区域一频率对应表, 但是, 如果是来自地面数字广播多频网的 TS传输流 并且没有单频网同步信息, 一种方法是: 作为非协同单频网处理, ***的频率 信息应该确保和地面数字广播多频网不同, 以避免对地面数字广播网的干扰; 另一种处理方法是向传输码流中***区域一频率对应表和自主同步控制信息, 使通过 HFC传输后的地面数字广播码流以起所在位置测量得到的地面数字广 播信号的时间关系来实现无 GPS信号的同步。 见步骤 3)。 Further, in order to control the coverage, 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. In order to avoid interference to the terrestrial digital broadcasting 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).
区域一频率描述使用特定频道(载波) 的区域的中心和半径; The area-frequency describes the center and radius of the area using a particular channel (carrier);
一个区域频率对应表中可以有多个区域中心和区域半径, 以便构造出灵活 的覆盖区域形状; A regional frequency correspondence table may have multiple regional centers and regional radii in order to construct a flexible coverage area shape;
进一步地, 为了控制覆盖范围, 在传输流 TS中加入功率控制参数; 对来自其他网络的码流(如卫星、 INTENET等), 根据预先确定的空口传输 的节目数量, 把这些节目中需要向空中发送的内容划分为若干个无线频道组 (同一无线频道组内的节目在同一个无线频道内传送); Further, in order to control the coverage, 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);
对每组节目加入无线传输所需要的 TPS信息和构建单频网所需要的 MIP同 步信息; Adding TPS information required for wireless transmission to each group of programs and MIP synchronization information required for constructing a single frequency network;
对每组节目的传输流 TS中加入区域一频率对应表 Adding a region-frequency correspondence table to the transport stream of each group of programs
进一步地, 为了控制覆盖范围, 在传输流 TS中加入功率控制参数; 步骤 504, HFC频道适配处理; Further, in order to control the coverage, a power control parameter is added to the transport stream TS; Step 504, an HFC channel adaptation process;
如果一个有线频道的容量可以传送多个无线频道组, 就将多个无线频道组 复用到一个有线信道内传输;
以下以有线电视网与地面数字广播网协同提供手机电视业务来进行进一 步的举例说明: If the capacity of one cable channel can transmit multiple wireless channel groups, 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:
鉴于有线电视网已经成为内容最为丰富的网络, 如果把线电视网丰富的内 容从同轴电缆内按照 DVB-H标准的空中接口信号形式辐射到空间,就可以实现 手机电视信号的室内外覆盖。 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.
一种有线电视网与地面数字广播网协同提供手机电视业务的***如图 4所 不。 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.
在图 4所示的***中,地面数字手机广播网 DVB- H的 TS、以及其他经过格 式变换处理形成 DVB- H格式的来自其他网络的内容, 如卫星的 MPEG- 2 TS经过 DVB-H格式转换,被网配送到布置在室内和室外的各个 DVB-H调制器和发射机, 各个 DVB-H调制器按照 TS中巨帧初始化参数(MIP)包中的同步信息和传输参 数信令(TPS) 对 TS进行调制, 然后通过发射机发送到需要覆盖的区域。 In the system shown in FIG. 4, 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. The TS is modulated and then sent through the transmitter to the area that needs to be covered.
这个有线电视网与地面数字广播网协同提供手机电视业务的***可用于: 1)增强地面数字手机电视广播信号的强度和覆盖的均匀性, 实现有线电视信 号对室内和室外的覆盖; 2)使有线电视网可以高效地支持内容通过手机下载 业务; 3)手机电视可以通过 DVB-H接收前端来接收***广播内容; 4)手 机电视可以通过 DVB-H接收前端来接收互联网的内容; 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;
由上可知, 本发明给出一种有线与无线协同的综合业务***结构, 其特点 在于在现有的有线电视网中引入了构建单频网所需要的协同单频网适配器和 DVB-T/H调制器; 本发明给出的一种有线与无线协同的数字广播方法, 该方法 的特点在于通过***协同发射辅助信息,有线电视数字广播的内容通过空中接 口同步地发送到特定区域,形成单频网。本发明给出的一种***协同发射辅助 信息的方法,其特点在于在数字电视传输流中***地理区域与发射频率的对应 表,使得依托有线电视网形成的无线覆盖的区域和该区域上的工作频率得到灵 活控制。本发明所述***和方法既可以实现有线电视广播信号对室内的无线覆 盖,也可以实现有线电视广播信号对室外的无线覆盖; 既可以利用有线电视网 实现对地面数字广播网的同频发射,改善地面数字广播信号的覆盖,也可以实 现内容下载。 本发明为有线电视网演变为无线综合业务网提供了一种技术途 径, 易于实现。 As can be seen from the above, 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.
当然, 本发明还可有其他多种实施例, 在不背离本发明精神及其实质的情
况下,熟悉本领域的技术人员当可根据本发明作出各种相应的改变和变形,但 这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。 工业应用性 Of course, the invention may have other various embodiments without departing from the spirit and spirit of the invention. Various changes and modifications can be made by those skilled in the art in light of the present invention, and the corresponding changes and modifications are intended to fall within the scope of the appended claims. Industrial applicability
本发明把线电视网丰富的内容从同轴电缆内辐射到空间, 并且这种延伸采 用单频网的发射形式,既可以高效使用地面电视广播的频谱,又可以实现与地 面数字广播网的协同。本发明的以有线电视网为依托,构建一个有线无线协同 的广播网, 这个有线无线协同的广播网实现了: 1 ) 增强地面数字电视广播信 号的强度和覆盖的均匀性; 2)将有线电视信号从 TV插座扩大到空间, 实现有 线电视信号对室内和室外的覆盖; 3)使有线电视网可以高效地支持内容下载 业务和预定内容的广播业务; 4) 在达到上述效果的同时, 新的***保持对现 有有线电视***的完全兼容。本发明方法适合有线电视网与地面数字广播网相 协同的技术领域, 本发明方法同样适合存在类似应用的其他各领域。
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.
Claims
1、 一种有线与无线协同的协同广播***结构, 其特征在于, 包括: 在现 有有线电视网中增加协同单频网适配器和 GPS接收机, 在有线电视网的 HFC 子网上增加顺序联接的 QAM解调和解复用、连接 GPS接收机的单频网同步单元、 调制器和发射机;在连接 SDH网的接收端网络适配器上增加顺序联接的解复用 单元、 连接 GPS接收机的单频网同步单元、 调制器和发射机; A wired and wireless coordinated cooperative broadcast system structure, comprising: adding a coordinated single frequency network adapter and a GPS receiver in an existing cable television network, and adding a sequential connection on an HFC subnet of the cable television network; QAM demodulation and demultiplexing, single frequency network synchronization unit, modulator and transmitter connected to the GPS receiver; adding a demultiplexing unit sequentially connected to the network adapter of the receiving end connected to the SDH network, and a single frequency connected to the GPS receiver Network synchronization unit, modulator and transmitter;
所述协同单频网适配器对来自不同网络的传输流进行分类处理, 并对需要 使用调制器和发射机向空中发射的传输流加入 "区域一频率"对应关系; The coordinated single frequency network adapter classifies a transport stream from different networks, and adds a "area-frequency" correspondence to a transport stream that needs to be transmitted to the air using a modulator and a transmitter;
所述 QAM解调和解复用用于从所述传输流分解出和一个无线广播频道对应 的一组传输流; The QAM demodulation and demultiplexing is used to decompose a set of transport streams corresponding to one radio broadcast channel from the transport stream;
所述解复用单元用于从所述传输流分解出和一个无线广播频道对应的一 组传输流; The demultiplexing unit is configured to decompose a set of transport streams corresponding to one radio broadcast channel from the transport stream;
所述调制器用于根据自己的位置和传输流中携带的 "区域一频率"对应关 系确定自己的工作频率、 发射功率; The modulator is configured to determine its working frequency and transmit power according to its position and the "area-frequency" correspondence carried in the transport stream;
所述发射机用于将和地面数字电视广播频道对应的传输流发送到对应的 服务区域,从而将有线电视网对地面数字电视广播网协同发射,利用有线电视 网向空间辐射的和地面数字电视广播频道发射的完全相同的信号,来改善地面 数字电视网的覆盖。 The transmitter is configured to transmit a transport stream corresponding to a terrestrial digital television broadcast channel to a corresponding service area, thereby jointly transmitting a cable television network to a terrestrial digital television broadcast network, and utilizing a cable television network to radiate space and terrestrial digital television The same signal transmitted by the broadcast channel to improve the coverage of the terrestrial digital television network.
2、 根据权利要求 1所述的协同***, 其特征在于, 所述协同单频网适配 器进行的分类处理包括:确定传输流是否已经携带单频网同步信息;确定送往 HFC网络的传输流中需要加入单频网同步信息的节目码流, 并对应加入单频网 同步信息。 2. The collaborative system according to claim 1, wherein the classification process performed by the coordinated single frequency network adapter comprises: determining whether the transport stream has carried the single frequency network synchronization information; and determining the transport stream sent to the HFC network. The program code stream of the single-frequency network synchronization information needs to be added, and the single-frequency network synchronization information is added correspondingly.
3、 根据权利要求 2所述的协同***, 其特征在于, 所述协同单频网适配 器还根据需要信号在 MPEG- 2传输流中加入同步质量测量和信号幅度测量控制 信息, 以保障单频网工作稳定。 The cooperative system according to claim 2, wherein 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 the single frequency network. stable job.
4、 根据权利要求 3所述的协同***, 其特征在于, 所述单频网同步信息 包括:不同码流或者码流组在不同的地理空间上使用的频率, 以及所述协同单 频网适配器为不同的传输流***的对应的单频网或者其对应的多频网中的一 个频点所覆盖的区域信息。
The cooperative system according to claim 3, wherein the single frequency network synchronization information comprises: a frequency used by different code streams or code stream groups in different geographical spaces, and the coordinated single frequency network adapter The area information covered by the corresponding single frequency network inserted in different transport streams or one of the corresponding multi-frequency networks.
5、 根据权利要求 4所述的协同***, 其特征在于, 所述区域信息为发射 机的位置座标和覆盖半径,不同位置的调制器和发射机根据所述区域信息来确 定应该采用的工作频点, 调制器和发射机的位置为预先设置或者通过安装 GPS 接收机获取。 5. The collaborative system according to claim 4, wherein the area information is a location coordinate and a coverage radius of the transmitter, and the modulator and the transmitter at different positions determine the work to be performed according to the area information. The frequency, the position of the modulator and transmitter are preset or obtained by installing a GPS receiver.
6、根据权利要求 5所述的协同***, 其特征在于, 所述调制器为 DVB-T/H 调制器或基于正交频分复用广播标准的 DMB/DAB调制器。 The cooperative system according to claim 5, wherein the modulator is a DVB-T/H modulator or a DMB/DAB modulator based on an orthogonal frequency division multiplexing broadcast standard.
7、 根据权利要求 5所述的协同***, 其特征在于, 所述单频网同步单元 使用的时间基准取自 GPS接收机或取自 HFC网内提供的时间基准。 7. The collaborative system according to claim 5, wherein 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.
8、 根据权利要求 1所述的协同***, 其特征在于, 还包括前置内容服务 器, 所述前置内容服务器连接所述 QAM解调和解复用、 单频网同步单元; 和 / 或所述前置内容服务器连接所述解复用单元、单频网同步单元;所述前置内容 服务器用于对需要通过调制器发送的预定内容进行存储。 8. The collaborative system according to claim 1, further comprising a pre-content server, said pre-content server connecting said QAM demodulation and demultiplexing, single frequency network synchronization unit; and/or said The pre-content server is connected to the demultiplexing unit and the single-frequency network synchronization unit; the pre-content server is configured to store predetermined content that needs to be sent by the modulator.
9、 根据权利要求 8所述的协同***, 其特征在于, 网络利用空闲时段对 所述预定内容进行上载,从而充分利用空闲时段的 HFC频谱,避免在业务繁忙 时段内使用 HFC带宽对相同的内容重复传送。 9. The collaborative system according to claim 8, wherein the network uploads the predetermined content by using an idle period to fully utilize the HFC spectrum of the idle period to avoid using the HFC bandwidth for the same content during a busy period of the service. Repeat the transfer.
10、 根据权利要求 8所述的协同***, 其特征在于, 所述预定内容包括: 预定的广播内容和 /或下载频度高的内容。 10. The collaborative system according to claim 8, wherein the predetermined content comprises: predetermined broadcast content and/or content with high download frequency.
11、 根据权利要求 8所述的协同***, 其特征在于, 网络中建立有各前置 内容服务器的内容镜像清单和内容镜像数据库,所述内容镜像数据库里面存储 各个前置内容服务器内容的并集;网络对前置内容服务器的内容进行定期维护 或即时维护,用以上载新的内容、清理过时的内容以及进行内容一致性的检查。 The collaborative system according to claim 8, wherein a content mirroring list and a content mirroring database of each pre-content server are established in the network, and the content mirror database stores the union of the content of each pre-content server. The network periodically maintains or maintains the content of the pre-content server to upload new content, clean out obsolete content, and check content consistency.
12、 根据权利要求 8所述的协同***, 其特征在于, 网络对所述预定内容 进行基于计划加载、基于统计加载或即时加载,对普通数据的预定内容在通讯 空闲期加载, 对实况转播和突发新闻数据的预定内容进行实时加载。 The collaborative system according to claim 8, wherein the network performs the plan-based loading, the statistical loading or the instant loading on the predetermined content, and the predetermined content of the normal data is loaded during the communication idle period, and the live broadcast is performed. The scheduled content of the breaking news data is loaded in real time.
13、 一种根据权利要求 8所述的协同***进行协同广播的方法, 其特征在 于, 包括: 13. A method for cooperative broadcast by a collaborative system according to claim 8, characterized in that it comprises:
步骤一, 把预播出的节目内容预先存储在所述前置内容服务器内, 并且预 存的节目内容是加入单频网同步控制信息的传输流; 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;
步骤二, 把播出的预定时间信息预存到所述前置内容服务器内; Step 2: pre-storing the broadcasted scheduled time information into the pre-content server;
步骤三, 所述前置内容服务器按照所述预定时间, 或者所述前置内容服务
器在接收到拨出控制信号之后,调制器根据传输流携带的同步控制信息, 以严 格的时间节奏发送所述预存的节目内容,以保障所述预存的节目内容是地面数 字广播网要播出的单频网同步信息完全一致的完全相同的传输流,从而构成了 有线电视网与地面数字广播网的协同发射。 Step 3: The pre-content server according to the predetermined time, or the pre-content service After receiving the dial-out control signal, the modulator transmits the pre-stored program content according to the synchronization control information carried by the transport stream in a strict time rhythm to ensure that the pre-stored program content is to be broadcasted by the terrestrial digital broadcast network. The single-frequency network synchronization information is completely identical to the identical transmission stream, thus forming a coordinated transmission of the cable television network and the terrestrial digital broadcasting network.
14、 根据权利要求 13所述的协同广播的方法, 其特征在于, 所述预播出 的节目内容为在未来特定时间内需要播出的地面电视广播节目的内容,所述预 播出的节目内容还用于下载服务,在下载时去掉单频网同步信息;所述前置内 容服务器对于独立广播的内容或者用于下载的内容,在网络的控制下灵活选择 播出时间、 播出方式。 14. The method of cooperative broadcast according to claim 13, wherein 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, the pre-broadcast program. The content is also used to download the service, and 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.
15、 一种根据权利要求 1所述的协同***实现协同发射辅助信息的方法, 其特征在于, 包括: 15. A method for cooperatively transmitting auxiliary information according to the collaborative system of claim 1, comprising:
步骤 A, 协同单频网适配器获取网络覆盖的先验信息; Step A: Cooperating with the single frequency network adapter to obtain a priori information of the network coverage;
步骤 B, 协同单频网适配器对传输流内的业务进行分类; Step B: Cooperating with the single frequency network adapter to classify services in the transport stream;
步骤 C, 协同单频网适配器对传输流加入辅助信息; Step C: Cooperating with the single frequency network adapter to add auxiliary information to the transport stream;
步骤 D, 进行 HFC频道的适配处理。 Step D: Perform adaptation processing of the HFC channel.
16、 根据权利要求 15所述的协同发射辅助信息的方法, 其特征在于, 通 过在有线电视网的头端中存储地面数字广播网的规划数据,来获取所述先验信 自 16. The method of cooperatively transmitting auxiliary information according to claim 15, wherein the a priori information is obtained by storing planning data of a terrestrial digital broadcasting network in a head end of a cable television network.
17、 根据权利要求 16所述的协同发射辅助信息的方法, 其特征在于, 所 述规划数据包括:运营商对各个不同地理区域上的有线电视网向无线延伸中可 以使用的频道 \载波、 每个载波传输的节目套数和编码调制方式的预先明确规 划信息,以及预先确定的在一个同轴电缆频道内传输的节目总套数中需要向无 线延伸发送的节目套数信息。 The method for cooperatively transmitting auxiliary information according to claim 16, wherein the planning data comprises: a channel/carrier that the operator can use for the wireless extension of the cable television network in different geographical areas, each The pre-defined planning information of the number of sets of programs transmitted by the carrier and the coded modulation mode, and the predetermined number of sets of programs that need to be transmitted to the wireless extension in the predetermined total number of sets of programs transmitted in one coaxial cable channel.
18、 根据权利要求 16所述的协同发射辅助信息的方法, 其特征在于, 所 述先验信息还包括节目复用信息, 并通过节目辅助表来获取所述节目复用信 The method for cooperatively transmitting auxiliary information according to claim 16, wherein the a priori information further includes program multiplexing information, and the program multiplexing information is obtained by using a program auxiliary table.
Λ∑!、 Oh!
19、 根据权利要求 15所述的协同发射辅助信息的方法, 其特征在于, 所 述步骤 Β中所述分类是根据传输流携带的网络信息表区分出:来自地面数字电 视广播单频网的码流、 来自卫星网的码流和 /或来自因特网的码流。 The method for cooperatively transmitting auxiliary information according to claim 15, wherein the classification in the step is: according to a network information table carried by the transport stream: a code from a terrestrial digital television broadcast single frequency network Stream, stream from the satellite network and/or stream from the Internet.
20、 根据权利要求 15所述的协同发射辅助信息的方法, 其特征在于, 在
所述步骤 C中,如果传输流中已经携带单频网同步信息,则在传输流中加入区 域一频率对应表; 所述区域一频率对应表描述使用特定频道 \载波的区域的中 心和半径;一个区域频率对应表中可以有多个区域中心和区域半径, 以便构造 出灵活的覆盖区域形状。 20. A method of cooperatively transmitting auxiliary information according to claim 15, wherein In the step C, if the transmission stream already carries the single frequency network synchronization information, the area-frequency correspondence table is added to the transmission stream; the area-frequency correspondence table describes the center and the radius of the area using the specific channel\carrier; A region frequency correspondence table may have multiple region centers and region radii in order to construct a flexible coverage region shape.
21、 根据权利要求 20所述的协同发射辅助信息的方法, 其特征在于, 还 包括: 在传输流中加入功率控制参数, 以便控制覆盖范围。 21. The method of cooperatively transmitting auxiliary information according to claim 20, further comprising: adding power control parameters to the transport stream to control coverage.
22、 根据权利要求 21所述的协同发射辅助信息的方法, 其特征在于, 在 所述步骤 C中,如果传输流中没有单频网同步信息,则在传输流中加入单频网 同步信息和区域一频率对应表; The method for cooperatively transmitting auxiliary information according to claim 21, wherein in the step C, if there is no single frequency network synchronization information in the transport stream, the single frequency network synchronization information is added to the transport stream and Area-frequency correspondence table;
并且, 如果是来自地面数字广播多频网的传输流并且没有单频网同步信 息, 则按以下两种方式处理: Moreover, 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:
方式一: 作为非协同单频网处理, ***的频率信息确保和地面数字广播多 频网不同, 以避免对地面数字广播网的干扰; Method 1: As a non-cooperative single frequency network processing, the inserted frequency information is ensured to be different from the terrestrial digital broadcasting multi-frequency network to avoid interference to the terrestrial digital broadcasting network;
方式二: 向传输流中***区域一频率对应表和自主同步控制信息, 使通过 HFC传输后的地面数字广播码流以起所在位置测量得到的地面数字广播信号 的时间关系来实现无 GPS信号的同步。 Manner 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 by the HFC realizes the GPS-free signal with the time relationship of the terrestrial digital broadcast signal measured at the location. Synchronize.
23、 根据权利要求 22所述的协同发射辅助信息的方法, 其特征在于, 对来自非有线电视网络的码流, 根据预先确定的空口传输的节目数量, 把 这些节目中需要向空中发送的内容划分为若干个无线频道组,同一无线频道组 内的节目在同一个无线频道内传送;对每组节目加入无线传输所需要的传输参 数信令和构建单频网所需要的巨帧初始化参数包同步信息;对每组节目的传输 流中加入区域一频率对应表。 The method for cooperatively transmitting auxiliary information according to claim 22, wherein, for the code stream from the non-cable television network, content that needs to be sent to the air in the programs according to the number of programs transmitted by the predetermined air interface Divided into a plurality of radio channel groups, the programs in the same radio channel group are transmitted in the same radio channel; the transmission parameter signaling required for wireless transmission for each group of programs and the jumbo frame initialization parameter packet required for constructing a single frequency network Synchronization information; a region-frequency correspondence table is added to the transport stream of each group of programs.
24、 根据权利要求 23所述的协同发射辅助信息的方法, 其特征在于, 所 述非有线电视网络为卫星信号网或因特网。 24. A method of cooperatively transmitting assistance information according to claim 23, wherein said non-cable television network is a satellite signal network or the Internet.
25、 根据权利要求 15所述的协同发射辅助信息的方法, 其特征在于, 在 步骤 D中,如果一个 HFC的有线频道的容量可以传送多个无线频道组,就将多 个无线频道组复用到一个有线信道内传输。 The method for cooperatively transmitting auxiliary information according to claim 15, wherein in step D, if a capacity of a cable channel of one HFC can transmit a plurality of radio channel groups, multiple radio channel groups are multiplexed. Transfer to a wired channel.
26、一种根据权利要求 1所述的协同***实现有线电视网与地面数字广播 网协同提供手机电视业务的方法, 其特征在于, DVB-H格式的传输流被网配送 到布置在室内和室外的各个 DVB-H调制器和发射机,各个 DVB-H调制器按照传
输中巨帧初始化参数包中的同步信息和传输参数信令对传输流进行调制,然后 通过发射机发送到需要覆盖的区域。 26. A collaborative system according to claim 1, wherein the cable television network and the terrestrial digital broadcast network cooperate to provide mobile phone television services, wherein the DVB-H format transport stream is distributed by the network to be placed indoors and outdoors. Individual DVB-H modulators and transmitters, each DVB-H modulator is transmitted The synchronization information and transmission parameter signaling in the transmission jumbo frame initialization parameter packet modulate the transport stream and then transmit it to the area to be covered by the transmitter.
27、 根据权利要求 26所述的有线电视网与地面数字广播网协同提供手机 电视业务的方法, 其特征在于, 所述 DVB-H格式的传输流包括: 地面数字手机 广播网的 DVB- H格式的传输流,以及经过格式变换处理形成的 DVB- H格式的传 输流。 27. The method according to claim 26, wherein the cable television network and the terrestrial digital broadcasting network cooperate to provide a mobile phone television service, wherein the DVB-H format transport stream comprises: a DVB-H format of a terrestrial digital mobile broadcast network. The transport stream, and the transport stream of the DVB-H format formed by the format conversion process.
28、 根据权利要求 27所述的有线电视网与地面数字广播网协同提供手机 电视业务的方法,其特征在于,所述经过格式变换处理形成的 DVB-H格式的传 输流为卫星的 MPEG- 2传输流经过 DVB-H格式转换形成。
The method for providing a mobile phone television service by the cable television network and the terrestrial digital broadcasting network according to claim 27, wherein the DVB-H formatted transport stream formed by the format conversion process is a satellite MPEG-2 The transport stream is formed by DVB-H format conversion.
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