CN101110688B - Single frequency network system transmission method and single frequency network adapter - Google Patents
Single frequency network system transmission method and single frequency network adapter Download PDFInfo
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Abstract
The present invention discloses a single frequency network system transmission method and a single frequency network adapter. Wherein, the method comprises a sending phase on a central control platform and a transmission phase on a transmission platform. The sending phase on the central control platform includes reuse of received renewable data. The renewal includes addition of at least one exclusive identifier before every n second of renewed data and transmission of the renewable data to a distributed network. In addition, the transmission phase on the transmission platform includes reuse decoding of the received renewable data. The reuse decoding at least includes a starting point to locate renewable data of every n second in the renewed data with the exclusive identifier for code element synchronization, modulation and transmission of decoded renewed data. The single frequency network adapter is composed of a receiving unit, a renewal unit and a transmission unit. The present invention can simply and effectively solves problems on code element synchronization at a transmission platform terminal of the single frequency network system and is suitable for transport streams of any rate.
Description
Technical field
The present invention relates to filed of mobile multimedia broadcasting, relate in particular to a kind of mobile multimedia broadcast system and mono-frequency network system thereof and synchro system.
Background technology
Along with the day of frequency resource is becoming tight, in mobile multimedia broadcast system, introduced the notion of SFN (SingleFrequency Network, single frequency network).So-called single frequency network is meant that the same time of several transmitting stations launch same signal on same frequency, with the reliable covering of realization to certain coverage.
The most direct benefit that single frequency network is brought is the raising of spectrum efficiency.For the multimedia broadcasting of the big bandwidth of needs, this advantage is more outstanding.The specification requirement of most critical is exactly that each transmitter signal of broadcasting is realized synchronously in the single frequency network.Because all transmitters adopt same frequency emission, so require three precise synchronization: Frequency Synchronization, time synchronized and symbol synchronization.
The Mobile Multimedia Broadcasting mono-frequency network system is made up of many digital transmitters, adopts the transmitting station of net distribution to realize covering on a large scale.In the prior art, typical Mobile Multimedia Broadcasting mono-frequency network system mainly is made up of zone center, transmitting station and distributed network, and wherein: zone center is used for distributing and concentrating signal, comprises Multiplexing module and SFN adapter etc.; Transmitting station is the important member of single frequency network, comprises being used for synchronous GPS (GPS (Global Position System)) clock, modulator etc., and a common zone center is corresponding to a plurality of transmitting stations, and according to the size of net, transmitting station can have several to dozens of (even more); Distributed network---be called program allocation system again, can pass through link forms such as microwave, optical fiber, communication line and satellite and realize, its effect is to give each transmitting station with the zone center signal allocation.Mobile multimedia broadcast system at present commonly used, in DVB system (digital video broadcast system), mobile multi-media broadcasting data stream by Multiplexing module multiplexing after, finish MIP bag (Mega frame Initialization Packet by single frequency adapter (SFN adapter) according to the reference clock of outside input, million frame initialization bags) generation also is inserted in the transmission code stream, each MIP bag and the transmission code stream of following thereafter constitute a big frame, transmit to each synchro system through distributed network; Carry the information of transmission code stream in synchronizing information and this big frame in the described MIP bag; Each MIP comprises indication lock in time and maximum delay.Synchro system obtains the additional delay that transmission code stream should add according to described indication lock in time and maximum delay; Described modulator just can be with the transmission code stream time-delay alignment through the heterogeneous networks propagated, to guarantee the time synchronized requirement in the single frequency network application according to described additional delay.Described synchro system also is used for finishing the accurate extraction of MIP bag Control Parameter and valid data, so that modulator carries out Base-Band Processing to data stream.Because inserting the position of MIP decides according to transmission rate, therefore for the different transmission code stream of speed different big frame structures is arranged, if there is the transmission code stream of multiple speed in the mono-frequency network system, then the transmission code stream for different rates will insert the MIP bag respectively, very flexible, and to adjust the position of inserting the MIP bag according to the speed of transmission code stream, also to judge which kind of big frame structure what adopt is during reception according to the difference of transmission rate, then could locator data the starting point of stream, can more complicated when realizing symbol synchronization and extracted valid data.
Summary of the invention
The technical problem to be solved in the present invention provides transmission method and the single frequency adapter in a kind of mono-frequency network system, can handle the different code stream unification of transmission rate, thereby can realize symbol synchronization in the single frequency network more flexibly, easily.
The technical solution used in the present invention is:
A kind of zone center sending method of mono-frequency network system comprises:
A, carry out each basic service flows and auxiliary data multiplexing;
B, carry out again multiplexing to the data after multiplexing; Describedly multiplexingly again add at least one unique identifier before being included in the every n multiplex data of second at least, wherein n is greater than or equal to 1 integer;
C, the data after will be more multiplexing send to distributed network.
Further, among the described step B, add unique identifier and be meant: before every n multiplex data of second, add a SFN Header (single frequency network indicating head); Comprise described unique identifier among the described SFN Header.
Further, also comprise system control parameters among the described SFN Header; Described system control parameters comprises system timing information and emission frequency point information at least.
Further, the length of described unique identifier equals the data length that each packet transmitted in the distributed network.
Further, among the step B, described multiplexingly more also comprise: multiplex data is divided into the data segment of several regular lengths, and respectively each data segment is filled redundant data, the data length that each packet transmitted in the length that makes each data segment and the distributed network is consistent.
Further, among the step B, described multiplexingly more also comprise: multiplex data is divided into the data segment of several regular lengths, and respectively each data segment is filled redundant data, the data length that each packet transmitted in the length that makes each data segment and the distributed network is consistent.
Further, the length of described unique identifier is 188 bytes.
Further, first byte of described unique identifier is a sync byte.
Further, among the described step B: described each data segment is filled redundant data, make its length extend to 188 bytes.
Further, among the step B, described multiplexingly more also comprise: when the Multiplexing module data total amount that n should transmit in time second under the current transmitter mode of operation of the data insufficient total amount that n sent in time second, fill redundant data and supply data volume.
The present invention also provides a kind of transmitting station transmission method of mono-frequency network system, comprising:
A, from distributed network, receive the data after multiplexing again;
B, separate again multiplexing to the multiplex data again that is received; Describedly separate again the multiplexing starting point of from described data after multiplexing again, locating every n multiplex data second that comprises at least, carry out symbol synchronization by the identification unique identifier;
C, modulate and launch separating again data after multiplexing.
Further, among the described step b: described unique identifier is carried by SFN Header.
Further, separate again described in the step b and multiplexingly also comprise: extraction system Control Parameter from SFN Header; Described system control parameters comprises system timing information and emission frequency point information at least.
Further, the length of described unique identifier equals the data length that each packet transmitted in the distributed network.
Further, separate again described in the step b and multiplexingly also comprise: in each packet of received data, find the redundant data of being filled and abandon to obtain valid data; The described valid data of storage after extraction.
Further, the length of described unique identifier is 188 bytes.
Further, first byte of described unique identifier is a sync byte.
Further, described step c specifically comprises:
C1, according to pulse index signal and system's timing parameters the data after specific time point reads demultiplexing;
C2, data are modulated according to system control parameters, according to the emission frequency point information in the centre frequency place of correspondence data streams.
The present invention also provides a kind of transmission method of mono-frequency network system, comprises that zone center sends stage and transmitting station transmit stage;
The described zone center transmission stage comprises:
A, carry out each basic service flows and auxiliary data multiplexing;
B, carry out again multiplexing to the data after multiplexing; Describedly multiplexingly again add at least one unique identifier before being included in the every n multiplex data of second at least, wherein n is greater than or equal to 1 integer;
C, the data after will be more multiplexing send to distributed network;
Described transmitting station transmit stage comprises:
A, from distributed network, receive the data after multiplexing again;
B, separate again multiplexing to the multiplex data again that is received; Describedly separate again the multiplexing starting point of from described data after multiplexing again, locating every n multiplex data second that comprises at least, carry out symbol synchronization by the identification unique identifier;
C, modulate and launch separating again data after multiplexing.
Further, among the described step B, add unique identifier and be meant: before every n multiplex data of second, add a SFN Header; Comprise described unique identifier among the described SFN Header;
Among the described step b: described unique identifier is carried by SFN Header.
Further, also comprise system control parameters in the described single frequency network indicating head;
Separate described in the step b again and multiplexingly also comprise: extraction system Control Parameter from the single frequency network indicating head;
Described system control parameters comprises system timing information and emission frequency point information at least;
Described step c specifically comprises:
C1, according to pulse index signal and system's timing parameters the data after specific time point reads demultiplexing;
C2, data are modulated according to system control parameters, according to the emission frequency point information in the centre frequency place of correspondence data streams.
Further, the length of described unique identifier equals the data length that each packet transmitted in the distributed network.
Further, among the step B, described multiplexingly more also comprise: multiplex data is divided into the data segment of several regular lengths, and respectively each data segment is filled redundant data, the data length that each packet transmitted in the length that makes each data segment and the distributed network is consistent;
Separate described in the step b again and multiplexingly also comprise: in each packet of received data, find the redundant data of being filled and abandon to obtain valid data; The described valid data of storage after extraction.
Further, among the step B, described multiplexingly more also comprise: multiplex data is divided into the data segment of several regular lengths, and respectively each data segment is filled redundant data, the data length that each packet transmitted in the length that makes each data segment and the distributed network is consistent;
Separate described in the step b again and multiplexingly also comprise: in each packet of received data, find the redundant data of being filled and abandon to obtain valid data; The described valid data of storage after extraction.
Further, the length of described unique identifier is 188 bytes.
Further, first byte of described unique identifier is a sync byte.
Further, among the described step B: described each data segment is filled redundant data, make its length extend to 188 bytes.
Further, among the step B, described multiplexingly more also comprise: when the Multiplexing module data total amount that n should transmit in time second under the current transmitter mode of operation of the data insufficient total amount that n sent in time second, fill redundant data and supply data volume.
The present invention also provides a kind of single frequency adapter, comprising:
Receiving element is used to receive multiplex data;
Multiplexing Unit again, the multiplex data that is used for receiving element is received carries out multiplexing again; And
Transmitting element is used for the data after multiplexing are again sent to distributed network;
Described Multiplexing Unit again comprises synchronous indication interpolation subelement at least, is used for adding at least one unique identifier before every n multiplex data of second, and wherein n is greater than or equal to 1 integer.
Further, described synchronous indication is added subelement and added unique identifier be meant before every n multiplex data of second: the subelement of indication interpolation synchronously adds a SFNHeader before every n multiplex data of second; Comprise described unique identifier among the described SFN Header.
Further, also comprise system timing information and emission frequency point information among the SFN Header that described synchronous indication interpolation subelement adds.
Further, the length of the unique identifier of described synchronous indication interpolation subelement interpolation equals the data length that each packet transmitted in the distributed network.
Further, described Multiplexing Unit more also comprises redundant data interpolation subelement, be used for each multiplexed frame is divided into the data segment of several regular lengths, and respectively each data segment is filled redundant data, the data length that each packet transmitted in the length that makes each data segment and the distributed network is consistent.
Further, the length of the unique identifier of described synchronous indication interpolation subelement interpolation is 188 bytes.
Further, first byte of the unique identifier of described synchronous indication interpolation subelement interpolation is a sync byte.
Further, described redundant data is added subelement described each data segment is filled redundant data, makes its length extend to 188 bytes.
Further, described redundant data is added subelement and also is used for when the Multiplexing module data total amount that n should transmit in time second under the current transmitter mode of operation of the data insufficient total amount that n sent in time second, fills redundant data and supplies data volume.
Adopt technical scheme of the present invention, the problem of the symbol synchronization of emission you in the solution mono-frequency network system that can be simple and effective, and accuracy and reliability height; System realizes going for the transmission code stream of any speed flexibly.And prioritization scheme of the present invention can also effectively be realized time synchronized and Frequency Synchronization, and can make the transmission requirement of the multimedia broadcast data format match distributed network that zone center sends.
Description of drawings
Fig. 1 is the concrete enforcement schematic diagram of mono-frequency network system of the present invention;
Fig. 2 is the concrete enforcement schematic diagram of the broadcast channel frame structure of Multiplexing module output among the present invention;
Fig. 3 is the schematic flow sheet of zone center sending method in the application example of the present invention;
Fig. 4 is the structural representation of single frequency adapter in the application example of the present invention;
Fig. 5 is the structural representation of single frequency network indicating head in the application example of the present invention;
Fig. 6 is for filling the schematic diagram of redundant data in the application example of the present invention;
Fig. 7 is the schematic flow sheet of transmitting station transmission method in the application example of the present invention.
Fig. 8 is the schematic diagram of extracted valid data in the application example of the present invention.
Embodiment
Below in conjunction with drawings and Examples technical scheme of the present invention is described in detail.
The invention provides a kind of single frequency adapter, can be used for mobile multimedia broadcast system, comprising: receiving element, Multiplexing Unit and transmitting element again.
The described receiving element of the embodiment of the invention is used to receive the multiplex data of multiplexing (MUX) module output---and be multiplexed frame, and these data are sent to Multiplexing Unit again;
The described Multiplexing Unit again of the embodiment of the invention is packed multiplex data---and also can be described as again multiplexingly, send to transmitting element then;
The described transmitting element of the embodiment of the invention is according to synchro system, and pulse index signal PPxS (pulse/sec, wherein x is greater than or equal to 1 the integer) signal that provides such as GPS sends the data after multiplexing again to distributed network.
The described Multiplexing Unit again of the embodiment of the invention comprises synchronous indication interpolation subelement at least.
The described synchronous indication of the embodiment of the invention is added subelement and is used at least adding unique identifier at described multiplex data.
Adding unique identifier is meant: indication is synchronously added subelement at every n multiplex data of second---and be to insert at least one unique identifier before every n broadcast channel frame, wherein n is greater than or equal to 1 integer; Described each broadcast channel frame is several multiplexed frames (referring to Fig. 2) of 1 second corresponding to total length of time; The speed of transmission code stream can be identical or different in these multiplexed frames, therefore realizes more flexible.
The described synchronous indication of the embodiment of the invention is added unique identifier that subelement adds and is used for identifying uniquely every n second---the top of just every n broadcast channel frame; In actual applications, described unique identifier transmits in network for convenience, and can set its length and equal the data length that each packet transmitted in the distributed network, because its byte is more, thus be easier to correct identification, so reliability is than higher; Such as for the system that meets the mobile multimedia broadcast system standard that China national General Bureau of Radio, Film and TV advocated, its length is made as 188 bytes; For the system of other standard, then be respective length; Certainly, also can be made as other length.First byte that the described synchronous indication interpolation subelement of the embodiment of the invention can also be set in this unique identifier is a sync byte, can certainly be set at other byte, promptly can not have sync byte or sync byte is placed on other position in the unique identifier.In application can but be not limited to design a string simple and specific character of identification easily.The purpose of adding unique identifier is in order to realize the symbol synchronization of SFN network.
The definition of the unique identifier that the described synchronous indication interpolation subelement of the embodiment of the invention adds and the value of n are stipulated when planning system, design single frequency adapter and synchro system according to described regulation then.
The described synchronous indication of the embodiment of the invention add subelement can but be not limited to also can otherwise add described unique identifier during practical application by adding the interpolation that a SFN Header (single frequency network indicating head) realizes this unique identifier.At least comprise described unique identifier in the single frequency network indicating head that is added.In the practical application, the foremost that subelement can be placed on described unique identifier SFN Header is added in the described synchronous indication of the embodiment of the invention, and the unique identifier sign is exactly the original position of SFNHeader like this.The described unique identifier of the embodiment of the invention can certainly be placed on SFN
Other position of Header.
The described synchronous indication of the embodiment of the invention is added subelement and can also be carried system control parameters in the SFN Header that is added, at least comprise system timing information and emission frequency point information in the described system control parameters of the embodiment of the invention, can also comprise the information such as relevant parameter that are used to indicate this n multiplexed frame second data, such as channel coding rate, interlace mode isotype Control Parameter.The integral multiple that the described system control parameters length of the embodiment of the invention is the data length that each packet transmitted in the distributed network, suppose that the data length that each packet transmits is the N byte, then can but be not limited to set that first byte in every N byte is a sync byte in the described system control parameters, promptly can not have sync byte or sync byte be placed on other position; Such as the system of the mobile multimedia broadcast system standard of being advocated for China national General Bureau of Radio, Film and TV, its length is made as the integral multiple of 188 bytes; First byte in per 188 bytes is a sync byte.
The insertion system Control Parameter is for the ease of the control information of modulator reading system, configure transmitter mode of operation in each transmitter, and time point and the frequency of adjusting data transmission, with realization time and Frequency Synchronization.
For the transmission that adapts to distributed network and the processing of modulator, the described Multiplexing Unit again of the embodiment of the invention can also comprise redundant data interpolation subelement, be used to receive each multiplexed frame of Multiplexing module output, can directly receive, also can add subelement and receive the multiplex data that has added SFN Header from the described synchronous indication of the embodiment of the invention from receiving element; And each multiplexed frame is divided into several regular lengths---be the data segment of length unanimity, and respectively each data segment filled redundant data that the data length that each packet transmitted in the length that makes each data segment and the distributed network is consistent; System such as the mobile multimedia broadcast system standard of being advocated for China national General Bureau of Radio, Film and TV, the length of each multiplexed frame is the integral multiple of 144 bytes, therefore the described redundant data interpolation of embodiment of the invention subelement is divided into a plurality of data segments that length is 144 bytes with each multiplexed frame, and, make its length reach 188 bytes to each data segment filling redundant data.The described redundant data of the embodiment of the invention add subelement can but first byte of data segment after being not limited to set each and filling is a sync byte, sync byte can certainly be placed on other position or not add sync byte.All the other redundant datas can be " 0 " data entirely, perhaps complete " 1 " data, and perhaps other data, the described redundant data of the embodiment of the invention is added the optional position that subelement can be filled in the redundant data beyond the sync byte described multiplexed frame; This filling position can be arranged when planning, perhaps also can be by described system control information notice synchro system in transmission course.
In addition, the described redundant data of the embodiment of the invention is added subelement and can also be used for when the Multiplexing module data total amount that n should transmit in time second under the current transmitter mode of operation of the data insufficient total amount that n exported in time second, fills redundant data to supply data volume.
The present invention also provides a kind of zone center sending method of mono-frequency network system, comprising:
A, Multiplexing module are to each basic service flows and auxiliary data is carried out multiplexing and the output multiplexed frame;
B, single frequency adapter receive described multiplexed frame and carry out multiplexing to it again---also can be described as packing:
The described multiplexing more every n multiplex data of second that is included at least of the embodiment of the invention---be to insert at least one unique identifier before every n broadcast channel frame, wherein n is greater than or equal to 1 integer; Described each broadcast channel frame is corresponding to several multiplexed frames in the time span 1 second, and the speed of transmission code stream can be identical or different in these multiplexed frames, therefore realizes more flexible.The described unique identifier of the embodiment of the invention can but be not limited to be defined as a string simple and specific character of identification easily.Can set unique identifier length and equal the data length that each packet transmitted in the distributed network, can also set its first byte is sync byte; Certainly also other design can be arranged in the practical application.The definition of the described unique identifier of the embodiment of the invention and the value of n can be stipulated when planning system.
The interpolation of described unique identifier can but be not limited to realize by adding a SFN Header, also can otherwise add described unique identifier during practical application.At least comprise described unique identifier among the SFNHeader that is added, can but be not limited to unique identifier is placed on the foremost of SFNHeader.Can also in SFN Header, carry system control parameters, at least comprise system timing information in the described system control parameters of the embodiment of the invention, can also comprise the information such as relevant parameter of launching frequency and being used to indicate n multiplexed frame second data, such as channel coding rate, interlace mode isotype Control Parameter.The integral multiple that the described system control parameters length of the embodiment of the invention is the data length that each packet transmitted in the distributed network, suppose that the data length that each packet transmits is the N byte, then can but be not limited to set that first byte in every N byte is a sync byte in the described system control parameters; Certainly also other design can be arranged in the practical application.
The embodiment of the invention is carried out format adaptation and conversion to multiplex data described multiplexing more also can comprising; Specific practice is: each multiplexed frame is divided into several regular lengths---be the data segment of length unanimity, and respectively each data segment filled redundant data that the data length that each packet transmitted in the length that makes each data segment and the distributed network is consistent.Can but first byte that is not limited to set each data segment after filling is a sync byte.Redundant data beyond the sync byte can be filled in the optional position of described data segment; The placement location of redundant data can be arranged when planning, perhaps also can be by described system control parameters notice synchro system in transmission course.
In addition, when the Multiplexing module data total amount that n should transmit in time second under the current transmitter mode of operation of the data insufficient total amount that n exported in time second, the embodiment of the invention is filled redundant data to supply data volume described multiplexing again can also comprising;
C, according to synchro system, the pulse index signal PPxS (pulse/sec, wherein x is greater than or equal to 1 integer) that provides such as GPS (GPS (Global Position System)) sends the data after multiplexing again to distributed network.
The present invention also provides a kind of transmitting station transmission method of mono-frequency network system, comprising:
A, synchro system receive data from distributed network---promptly pass through the multiplexing again data of single frequency adapter;
B, synchro system are separated multiplexing to the multiplex data again that is received again:
The embodiment of the invention is described separates multiplexing comprising at least from described data after multiplexing more again and locatees every n broadcast channel frame by the identification unique identifier---and be the starting point of every n multiplexed frame second, carry out symbol synchronization.The described unique identifier of the embodiment of the invention can but be not limited to carry by SFN Header, this moment, the starting point of every n broadcast channel frame was the starting point of SFN Header.The length of the unique identifier that described symbol synchronization unit is discerned can but be not limited to equal the data length that each packet transmitted in the distributed network.
When unique identifier is carried by SFN Header, the embodiment of the invention is described separates and multiplexingly can also comprise extraction system Control Parameter from SFN Header, and according to the system control parameters that is extracted corresponding system control parameters register in the modulator is set; Can after being set, register abandon SFNHeader.The described system control parameters of the embodiment of the invention comprises system timing information and emission frequency point information at least; Can also comprise other system control parameters---as channel coding rate, interlace mode isotype Control Parameter.
The embodiment of the invention is described separates and multiplexingly can also comprise extracted valid data, arrange during promptly according to the network planning or system control parameters in the redundant data position of defined, in received data, follow and find the redundant data of being filled in each packet behind SFN Header and abandon to obtain valid data; The described valid data of storage after extraction.
Pulse index signal PPxS and system timing information data in the memory cell in specific time point request synchro system that c, modulator provide according to synchro system are to realize time synchronized;
D, modulator are modulated data according to the system control parameters of depositing in the system control parameters register after receiving the data that described memory cell sends;
E, the data after will modulating are launched by antenna.Can be according to the emission frequency point information in the centre frequency place of correspondence data streams, to realize Frequency Synchronization.
The present invention also provides the data transmission method in a kind of mono-frequency network system, comprises the transmission stage of zone center and the transmit stage of transmitting station; These two stages repeat no more in the existing detailed description of preamble.
Further be illustrated with an application example of the present invention below.Should use in the example, mobile media broadcasting network meets the mobile multimedia broadcast system standard that China national General Bureau of Radio, Film and TV is advocated.
Should be as shown in Figure 1 with the mono-frequency network system in the example, wherein the MUX module is a Multiplexing module, the multiplexing standard of data fit of MUX module output, form as shown in Figure 2, each broadcast channel frame is corresponding to 1 second multiplexed frame of time span.Synchro system can but be not limited to GPS (global positioning system).Modulator (modulator) can be general modulator, also can be the modulator that meets the mobile multimedia broadcast system standard that China national General Bureau of Radio, Film and TV advocated.
Should be with in the example, the transmission method of mono-frequency network system comprises that zone center sends stage and transmitting station transmit stage, introduces respectively below in detail:
Should send the stage as shown in Figure 3 with the described zone center of example, comprise:
(1) the MUX module is carried out each program data multiplexing and the output multiplexed frame;
(2) the SFN adapter receives described multiplexed frame and carries out multiplexing to it again;
As shown in Figure 4, should comprise with the described single frequency adapter of example: receiving element, Multiplexing Unit and transmitting element again.Should be used to receive the multiplex data of multiplexing (MUX) module output with the described receiving element of example, and these data are sent to Multiplexing Unit again.
Should comprise that subelement is added in synchronous indication and redundant data is added subelement with the described Multiplexing Unit again of example.
Step (2) specifically may further comprise the steps:
At first should add subelement at every n multiplexed frame second with the described synchronous indication of example---be that every n broadcast channel frame is added a SFN Header before, described SFN indicating head transformat meets MPEG-2 TS (dynamic image expert group transmission code stream) form, the data length that is every TS (transport stream) bag is 188 bytes, and wherein first byte is sync byte 0x47 or 0xB8.
The SFN Header that is added is made up of two parts, and as shown in Figure 5, wherein first is that length is the unique identifier of 188 bytes, and second portion is that length is the system control parameters of integer 188 bytes.
Should be used for identifying uniquely the original position of SFN Header Frame with the described unique identifier of example, its first byte is the sync byte 0x47 or the 0xB8 of MPEG-2TS bag, and 187 bytes subsequently are special data.
Should can individual 188 byte packet of round numbers (being greater than or equal to 1) come bearing system timing parameters and pattern Control Parameter with the described system control parameters part of example; Wherein, first byte of per 188 byte packet is sync byte 0x47 or 0xB8.Described system control information comprises system timing information at least, the time that emission postpones with respect to PPxS as transmitter data etc.; Also comprise channel coding rate, interlace mode etc.
Then, should add subelement with the described redundant data of example and each multiplexed frame of multiplexer MUX output will be carried out format conversion, make its adaptive MPEG-2 TS form, just will make each length of data package is 188 bytes.Should be with in the example, because the multiplex data amount that the MUX module sends must be the integral multiple of 144 bytes, therefore should add the data segment that subelement is divided into multiplexed frame a plurality of 144 byte lengths with the described redundant data of example, each data segment---be the redundant data that the multiplex data of per 144 bytes adds 44 bytes, obtain the packet of 188 bytes, wherein first byte is a sync byte, as shown in Figure 6, in this example all redundancy bytes except sync byte are added on the last of packet, and in system control parameters with multiplex mode notice synchro system.
When the MUX module data total amount that n should transmit in time second under the current transmitter mode of operation of the data insufficient total amount that n sent in time second, then should add subelement with the described redundant data of example also needs to utilize the method for filling redundant data with not enough data volume polishing.
Should all adopt 0x00 to fill with the redundancy bytes of being filled in the example.
(3) should be with the described transmitting element of example according to synchro system, the pulse index signal PPxS (pulse/sec that provides such as GPS (GPS (Global Position System)), wherein x is greater than or equal to 1 integer) signal, the data after multiplexing are again sent to distributed network;
Should comprise with the described transmitting station transmit stage of example as shown in Figure 7:
(4) synchro system receives described data after multiplexing again from distributed network;
(5) synchro system is separated multiplexingly again to described data after multiplexing again, comprising:
At first locate the starting point of each SFNHeader by identification unique identifier from described multimedia broadcast data stream, the starting point of just every n broadcast channel frame is carried out symbol synchronization.
Location back extraction system Control Parameter in the SFN Header of data, and corresponding system control parameters register in the modulator is set according to the system control parameters that is extracted, and after register is set, abandon SFN Header.The system parameters of being extracted comprises time that transmitter emission data postpone with respect to the pulse index signal, and emission frequency point information at least.
Then according to the redundant data in corresponding each packet that abandons received data of the multiplex mode in the system control parameters, each length of data package is 188 bytes, as shown in Figure 8, will be wherein first byte and last 43 bytes abandon, obtain the valid data of 144 bytes and it be stored in table tennis memory (Ping-Pong memory) or the first-in first-out register (FIFO);
(6) the pulse index signal PPxS that provides according to synchro system of modulator and system timing information at specific time point to the synchro system request msg, to realize time synchronized; Such as according to transmitter data emission with respect to the time that PPxS postpones, calculate this behind each PPxS when to the synchro system request msg;
(7) modulator is modulated data according to the system control parameters of depositing in the system control parameters register after receiving the data of synchronized transmission;
(8) after after the radio frequency processing signal that modulates is launched in the air; In the centre frequency place of correspondence data streams, realize Frequency Synchronization according to the emission frequency point information.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (38)
1. the zone center sending method of a mono-frequency network system comprises:
A, carry out each basic service flows and auxiliary data multiplexing;
B, carry out again multiplexing to the data after multiplexing; Describedly multiplexingly again add at least one unique identifier before being included in the every n multiplex data of second at least, wherein n is greater than or equal to 1 integer;
C, the data after will be more multiplexing send to distributed network.
2. zone center sending method as claimed in claim 1 is characterized in that, among the described step B, adds unique identifier and is meant: add a single frequency network indicating head before every n multiplex data of second; Comprise described unique identifier in the described single frequency network indicating head.
3. zone center sending method as claimed in claim 2 is characterized in that, also comprises system control parameters in the described single frequency network indicating head; Described system control parameters comprises system timing information and emission frequency point information at least.
4. as claim 1,2 or 3 described zone center sending methods, it is characterized in that the length of described unique identifier equals the data length that each packet transmitted in the distributed network.
5. as claim 1,2 or 3 described zone center sending methods, it is characterized in that, among the step B, described multiplexingly more also comprise: the data segment that multiplex data is divided into several regular lengths, and respectively each data segment is filled redundant data, the data length that each packet transmitted in the length that makes each data segment and the distributed network is consistent.
6. zone center sending method as claimed in claim 4, it is characterized in that, among the step B, described multiplexingly more also comprise: the data segment that multiplex data is divided into several regular lengths, and respectively each data segment is filled redundant data, the data length that each packet transmitted in the length that makes each data segment and the distributed network is consistent.
7. zone center sending method as claimed in claim 4 is characterized in that: the length of described unique identifier is 188 bytes.
8. as claim 1,2 or 3 described zone center sending methods, it is characterized in that: first byte of described unique identifier is a sync byte.
9. zone center sending method as claimed in claim 5 is characterized in that, among the described step B: described each data segment is filled redundant data, make its length extend to 188 bytes.
10. as claim 1,2 or 3 described zone center sending methods, it is characterized in that, among the step B, described multiplexingly more also comprise: when the Multiplexing module data total amount that n should transmit in time second under the current transmitter mode of operation of the data insufficient total amount that n sent in time second, fill redundant data and supply data volume.
11. the transmitting station transmission method of a mono-frequency network system comprises:
A, from distributed network, receive the data after multiplexing again;
B, separate again multiplexing to the multiplex data again that is received; Describedly separate again the multiplexing starting point of from described data after multiplexing again, locating every n multiplex data second that comprises at least, carry out symbol synchronization by the identification unique identifier;
C, modulate and launch separating again data after multiplexing.
12. transmitting station transmission method as claimed in claim 11 is characterized in that, among the described step b: described unique identifier is carried by the single frequency network indicating head.
13. transmitting station transmission method as claimed in claim 12 is characterized in that, separates described in the step b more multiplexingly also to comprise: extraction system Control Parameter from the single frequency network indicating head; Described system control parameters comprises system timing information and emission frequency point information at least.
14. as claim 11,12 or 13 described transmitting station transmission methods, it is characterized in that: the length of described unique identifier equals the data length that each packet transmitted in the distributed network.
15. as claim 11,12 or 13 described transmitting station transmission methods, it is characterized in that, separate described in the step b again and multiplexingly also comprise: in each packet of received data, find the redundant data of being filled and abandon to obtain valid data; The described valid data of storage after extraction.
16. transmitting station transmission method as claimed in claim 14 is characterized in that: the length of described unique identifier is 188 bytes.
17. as claim 11,12 or 13 described transmitting station transmission methods, it is characterized in that: first byte of described unique identifier is a sync byte.
18. transmitting station transmission method as claimed in claim 13 is characterized in that, described step c specifically comprises:
C1, according to pulse index signal and system's timing parameters the data after specific time point reads demultiplexing;
C2, data are modulated according to system control parameters, according to the emission frequency point information in the centre frequency place of correspondence data streams.
19. the transmission method of a mono-frequency network system comprises that zone center sends stage and transmitting station transmit stage;
The described zone center transmission stage comprises:
A, carry out each basic service flows and auxiliary data multiplexing;
B, carry out again multiplexing to the data after multiplexing; Describedly multiplexingly again add at least one unique identifier before being included in the every n multiplex data of second at least, wherein n is greater than or equal to 1 integer;
C, the data after will be more multiplexing send to distributed network;
Described transmitting station transmit stage comprises:
A, from distributed network, receive the data after multiplexing again;
B, separate again multiplexing to the multiplex data again that is received; Describedly separate again the multiplexing starting point of from described data after multiplexing again, locating every n multiplex data second that comprises at least, carry out symbol synchronization by the identification unique identifier;
C, modulate and launch separating again data after multiplexing.
20. transmission method as claimed in claim 19 is characterized in that, among the described step B, adds unique identifier and is meant: add a single frequency network indicating head before every n multiplex data of second; Comprise described unique identifier in the described single frequency network indicating head;
Among the described step b: described unique identifier is carried by the single frequency network indicating head.
21. transmission method as claimed in claim 20 is characterized in that, also comprises system control parameters in the described single frequency network indicating head;
Separate described in the step b again and multiplexingly also comprise: extraction system Control Parameter from the single frequency network indicating head;
Described system control parameters comprises system timing information and emission frequency point information at least;
Described step c specifically comprises:
C1, according to pulse index signal and system's timing parameters the data after specific time point reads demultiplexing;
C2, data are modulated according to system control parameters, according to the emission frequency point information in the centre frequency place of correspondence data streams.
22., it is characterized in that the length of described unique identifier equals the data length that each packet transmitted in the distributed network as claim 19,20 or 21 described transmission methods.
23. as claim 19,20 or 21 described transmission methods, it is characterized in that, among the step B, described multiplexingly more also comprise: the data segment that multiplex data is divided into several regular lengths, and respectively each data segment is filled redundant data, the data length that each packet transmitted in the length that makes each data segment and the distributed network is consistent;
Separate described in the step b again and multiplexingly also comprise: in each packet of received data, find the redundant data of being filled and abandon to obtain valid data; The described valid data of storage after extraction.
24. transmission method as claimed in claim 22, it is characterized in that, among the step B, described multiplexingly more also comprise: the data segment that multiplex data is divided into several regular lengths, and respectively each data segment is filled redundant data, the data length that each packet transmitted in the length that makes each data segment and the distributed network is consistent;
Separate described in the step b again and multiplexingly also comprise: in each packet of received data, find the redundant data of being filled and abandon to obtain valid data; The described valid data of storage after extraction.
25. transmission method as claimed in claim 22 is characterized in that: the length of described unique identifier is 188 bytes.
26. as claim 19,20 or 21 described transmission methods, it is characterized in that: first byte of described unique identifier is a sync byte.
27. transmission method as claimed in claim 23 is characterized in that, among the described step B: described each data segment is filled redundant data, make its length extend to 188 bytes.
28. as claim 19,20 or 21 described transmission methods, it is characterized in that, among the step B, described multiplexingly more also comprise: when the Multiplexing module data total amount that n should transmit in time second under the current transmitter mode of operation of the data insufficient total amount that n sent in time second, fill redundant data and supply data volume.
29. a single frequency adapter comprises:
Receiving element is used to receive multiplex data;
Multiplexing Unit again, the multiplex data that is used for receiving element is received carries out multiplexing again; And
Transmitting element is used for the data after multiplexing are again sent to distributed network;
It is characterized in that:
Described Multiplexing Unit again comprises synchronous indication interpolation subelement at least, is used for adding at least one unique identifier before every n multiplex data of second, and wherein n is greater than or equal to 1 integer.
30. single frequency adapter as claimed in claim 29, it is characterized in that described synchronous indication interpolation subelement adds unique identifier and is meant before every n multiplex data of second: indication is synchronously added subelement and add a single frequency network indicating head before every n multiplex data of second; Comprise described unique identifier in the described single frequency network indicating head.
31. single frequency adapter as claimed in claim 30 is characterized in that: also comprise system timing information and emission frequency point information in the single frequency network indicating head that described synchronous indication interpolation subelement adds.
32. as claim 29,30 or 31 described single frequency adapters, it is characterized in that: the length that the unique identifier of subelement interpolation is added in described synchronous indication equals the data length that each packet transmitted in the distributed network.
33. as claim 29,30 or 31 described single frequency adapters, it is characterized in that: described Multiplexing Unit more also comprises redundant data interpolation subelement, be used for each multiplexed frame is divided into the data segment of several regular lengths, and respectively each data segment is filled redundant data, the data length that each packet transmitted in the length that makes each data segment and the distributed network is consistent.
34. single frequency adapter as claimed in claim 32, it is characterized in that: described Multiplexing Unit more also comprises redundant data interpolation subelement, be used for each multiplexed frame is divided into the data segment of several regular lengths, and respectively each data segment is filled redundant data, the data length that each packet transmitted in the length that makes each data segment and the distributed network is consistent.
35. single frequency adapter as claimed in claim 32 is characterized in that: the length that the unique identifier of subelement interpolation is added in described synchronous indication is 188 bytes.
36. as claim 29,30 or 31 described single frequency adapters, it is characterized in that: first byte that the unique identifier of subelement interpolation is added in described synchronous indication is a sync byte.
37. single frequency adapter as claimed in claim 33 is characterized in that: described redundant data is added subelement described each data segment is filled redundant data, makes its length extend to 188 bytes.
38. single frequency adapter as claimed in claim 33, it is characterized in that, described redundant data is added subelement and also is used for when the Multiplexing module data total amount that n should transmit in time second under the current transmitter mode of operation of the data insufficient total amount that n sent in time second, fills redundant data and supplies data volume.
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| CN103607259B (en) * | 2013-11-18 | 2017-05-24 | 海能达通信股份有限公司 | Data frame transmission method and data frame transmission device |
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| CN1976495A (en) * | 2006-11-30 | 2007-06-06 | 中兴通讯股份有限公司 | Mobile multimedia broadcasting control information and media information specification transmitting method |
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| CN1976495A (en) * | 2006-11-30 | 2007-06-06 | 中兴通讯股份有限公司 | Mobile multimedia broadcasting control information and media information specification transmitting method |
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