CN101902629B - Data transmission method of terrestrial mobile multimedia broadcasting system - Google Patents
Data transmission method of terrestrial mobile multimedia broadcasting system Download PDFInfo
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- CN101902629B CN101902629B CN2010102186030A CN201010218603A CN101902629B CN 101902629 B CN101902629 B CN 101902629B CN 2010102186030 A CN2010102186030 A CN 2010102186030A CN 201010218603 A CN201010218603 A CN 201010218603A CN 101902629 B CN101902629 B CN 101902629B
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Abstract
The invention discloses a data transmission method of a terrestrial mobile multimedia broadcasting system, comprising the following steps of: independently carrying out channel coding, time interleaving and modulation on T-MMB (Terrestrial-Mobile Multimedia Broadcasting) service data on the basis of the structures of a DAB (Digital Audio Broadcasting) system and a T-DMB (Terrestrial-Digital Multimedia Broadcasting) system; embedding DAB service data, DAB-IP (Internet Protocol) service data, T-DMB service data and T-MMB service data into an MSC (Main Service Channel) of the DAB in a time multiplexing way; increasing instructions for T-MMB services in an FIC (Fast Information Channel); sending MSC data and FIC data to a subsequent module for processing in a preset mode so as to form a transmission frame, and then sending out through radio frequency modulation according to a preset frequency band; respectively processing corresponding service signals by a DAB receiver, a DAB-IP receiver and a T-DMB receiver, and processing multipath service signals including a DAB service signal, a DAB-IP service signal, a T-DMB service signal, a T-MMB service signal, and the like by a T-MMB receiver.
Description
The application is for dividing an application, and the applying date of its original application does
On December 08th, 2006, application number does
200610161929.8, invention and created name does
The transmission realization side of compatible multistandard in the T-MMB system Method
Technical field
The present invention relates to communication and multimedia technology field, refer to especially a kind of in ground mobile multimedia broadcasting system the transmission implementation method of compatible multistandard.
Background technology
Digital audio broadcasting DAB standard is the international standard that is used for digital audio broadcasting that the eighties of last century International Organization for Standardization nineties is formulated, and adopts convolution code as error correcting code.The DAB system compare with traditional AM/FM broadcasting system has tonequality good, move advantages such as receiving ability is strong, be to broadcast continue traditional amplitude modulation, third generation FM broadcasting after.
Used convolution code to add the RS sign indicating number in the T-DMB that on the DAB basis, grows up (T-DMB) system as error correcting code; Utilized the technical advantage of DAB fully, on function, will transmit single audio-frequency information and expand to variety carrier such as data, literal, figure and video.Provide that capacity is big, the data message of good reliability transmits.
Though DAB and T-DMB system have above-mentioned advantage; But also exist weak point: the two all adopts the DQPSK modulation; The availability of frequency spectrum is low, does not provide enough information throughput to satisfy the such high-quality service of mobile TV, for receiver enough power-saving measures or the like is not provided.
Ground mobile multimedia broadcast T-MMB (Terrestrial Mobile Multimedia Broadcasting) then is on the basis of DAB and T-DMB standard, through adding a kind of new DMB standard that contents such as new block encoding (like LDPC coding), time-interleaved, high order modulation and professional indication information realize.T-MMB has taken all factors into consideration the frequency resource; The receiver complexity; Factor such as the availability of frequency spectrum and systematic function, the complete compatibility of realization and DAB and T-DMB, low-cost design, low power dissipation design, frequency availability be good, support to move reception, SFN realization, spectral efficient, multi-service, high-quality service etc.It has following several characteristic:
(1) the T-DMB system of complete compatible Eureka-147 (DAB) and Korea S.
(2) adopted high order modulation, channel efficiency is higher than the DAB system.
(3) the senior channel error correction coding LDPC sign indicating number and the DAPSK modulation scheme of high-efficient low-complexity have been adopted.
Summary of the invention
The objective of the invention is in order to overcome the deficiency of above-mentioned China mobile multi-media broadcasting technology; On the basis of Compatiable DAB and T-DMB system; Use for reference the latest technological achievements of the communications field; A kind of ground mobile multimedia broadcast (Terrestrial Mobile Multimedia Broadcasting, the T-MMB) data transmission method of system are provided.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
Provided by the invention a kind of in the T-MMB system data transmission method of compatible multistandard, may further comprise the steps:
Keep DAB and T-DMB system configuration constant; The T-MMB business datum is independently carried out source encoding, chnnel coding, time-interleaved and modulation, and DAB, DAB-IP, T-DMB and T-MMB business datum are embedded in the DAB main business channel (MSC) with time-multiplexed mode;
Professional for T-MMB, according to the modulation system of business datum, confirm the size of capacity corresponding unit CU among the MSC;
In fast information channel in dab receiver (FIC), increase professional indication, send subsequent module for processing to form transmission frame MSC and FIC data, send according to predetermined frequency band through rf modulations then with preassigned pattern to T-MMB;
DAB, DAB-IP and T-DMB receiver are handled the corresponding service signal respectively, and the T-MMB receiver is handled DAB, DAB-IP, T-DMB and four kinds of service signals of T-MMB, and the T-MMB receiver also receives separately and handles the T-MMB service signal.
When type of service was the T-MMB business, the said channel coding method that the business datum that receives is carried out was: cascaded code or low-density checksum LDPC sign indicating number.
When type of service is the T-MMB business; The size of corresponding CU is among said definite MSC: n * 32bits; Wherein on behalf of business datum, n=2 use the DQPSK modulation system, and on behalf of business datum, n=3 use the 8DPSK modulation system, and on behalf of business datum, n=4 use the 16DAPSK modulation system.
Further comprise: in FIC, expand among the FIG type 0 mode of extension 2-FIG0/2 the definition of audio service component type (ASCTy) and DSCTy (DSCTy), the concrete implication of each field is with reference to ETSI EN 300401V1.4.1 (2006-06) among the FIG0/2.
Further comprise: in FIC, expand among the FIG type 0 mode of extension 13-FIG0/13 the definition of user's application message (User Application Type) and user's application data (User Application Data), the concrete implication of each field is with reference to ETSI EN 300 401V1.4.1 (2006-06) among the FIG0/13.
Further comprise: newly-increased FIG type expansion in FIC, the professional subchannel characteristic of T-MMB is described.
Further comprise: newly-increased FIG type expansion in FIC, the positional information that the T-MMB business adopts LDPC coding time block code block is described.
Send subsequent module for processing to form transmission frame MSC and FIC data with preassigned pattern, send according to predetermined frequency band through rf modulations then.
Further comprise: DAB, DAB-IP and T-DMB receiver are handled signal separately respectively; The T-MMB receiver extracts professional indication information to FIC decoding back from FIG, can handle multichannel service signals such as DAB, DAB-IP, T-DMB and T-MMB; The T-MMB receiver also can receive separately handles the T-MMB service signal.
Description of drawings
Fig. 1 is the T-MMB system transmissions implementation method flow chart of Compatiable DAB of the present invention and T-DMB;
Fig. 2 is the theory diagram of T-MMB transmission implementation method of the present invention;
Fig. 3 organizes configuration structure for the basic service that adopts among the transmission method embodiment of the present invention;
The user application message configuration structure of Fig. 4 for adopting among the transmission method embodiment of the present invention;
The subchannel information configuration structure of Fig. 5 for adopting among the transmission method embodiment of the present invention;
The block encoding configuration structure of Fig. 6 for adopting among the transmission method embodiment of the present invention;
Fig. 7 is a T-MMB system transmissions frame structure sketch map of the present invention;
Fig. 8 is a T-MMB system transmissions frame forming process sketch map of the present invention;
Fig. 9 is a T-MMB receiver block diagram of the present invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, below with reference to the accompanying drawing preferred embodiment that develops simultaneously, to further explain of the present invention.
In following explanation, the part identical with DAB and T-DMB repeats no more, and introduces the part that is different from DAB and T-DMB in the T-MMB system.
Fig. 1 is the overview flow chart of the T-MMB transmission method of Compatiable DAB of the present invention.As shown in Figure 1, this method comprises:
Step 101 preestablishes the type of service of multimedia broadcasting, and said type of service comprises that ground mobile multimedia broadcast T-MMB is professional.
Step 102; The receiving multimedia broadcast business datum; According to its type of service, the business datum that receives is carried out source encoding, chnnel coding, time-interleaved and Channel Modulation successively, and the data after time-interleaved are embedded among the MSC MSC of DAB system with time-multiplexed mode.
Step 103; Business datum corresponding service type, the subchannel information that takies and code modulation mode are identified in fast information channel in dab receiver FIC; Give subsequent module for processing together with the MSC data then and form the T-MMB transmission frame, the T-MMB transmission frame is sent after rf modulations.
Fig. 2 is the theory diagram of T-MMB transmission implementation method of the present invention.
As shown in Figure 2; Transmitting of T-MMB system can be synthetic by four road signals: the DAB signal; The DAB-IP signal, T-DMB signal and T-MMB signal, wherein T-MMB, T-DMB and DAB-IP signal are with among the professional MSC MSC that embeds DAB independently; Give subsequent module for processing together with the data of FIC then and form transmission frame, send then through rf modulations again.
Fig. 3 organizes configuration structure for the basic service that adopts among the transmission method embodiment of the present invention.Among Fig. 3 the concrete implication of each field referring among ETSI EN 300 401V1.4.1 (2006-06) to the description of FIG0/2.When transmission T-MMB service signal, describe below in FIG0/2, increasing newly:
-ASCTy (audio service component type): the type of the professional composition of this 6 bit regions indicative audio.
Increased the sign of two kinds of audio coding modes in the present embodiment, defined as follows:
0?0?0?0?1?1：MPEG-4HE?AAC?V2；
0?0?0?1?0?0：MPEG-4ER-BSAC。
-DSCTy (DSCTy): the type of the professional composition of this 6 bit designation data.Specific explanations is seen TS 101 756, and table 2.Increase a kind of new business type identification in the present embodiment, as follows: 01100 1:T-MMB are professional.
The user application message configuration structure of Fig. 4 for adopting among the transmission method embodiment of the present invention.Among Fig. 4 the concrete implication of each field referring among ETSI EN 300 401V1.4.1 (2006-06) to the description of FIG0/13.When transmission T-MMB service signal, describe below in FI G0/13, increasing newly:
-User Application Type (user's application type): this 11 bit has provided needs the user of decoding to use, and these application are to be identified by professional label (SId) and professional composition label (SCId), and it defines with reference to TS 101 756 tables 16.In the new system this option is expanded, specific as follows:
The business of 0x00b:T-MMB system
-User Application data (user's application data): this m * 8 Bit datas are used for transmission user application message data, are determined by user's application type during decoding.The Video service framework 1 of T-MMB system, framework 2 can be respectively identified by the service attribute of system, and be specific as follows:
VideoServiceObjectProfileId＝0x01
VideoServiceObjectProfileId＝0x02。
The subchannel information configuration structure of Fig. 5 for adopting among the transmission method embodiment of the present invention.Adopt FIG0/15 to describe the professional subchannel information of T-MMB in an embodiment of the present invention.The implication of each field is following among Fig. 5:
SubChId (subchannel identifier): the signless binary number of this 6 bit is used for identifying certain subchannel.
Start Address (initial address): this 10 bit regions is encoded to signless binary number (scope 0 to 863), the address of pointing out first capacity unit (CU) in the subchannel.
ModuType (modulation type): this 2 bit is used for indicating the DQPSK/8DPSK/16DAPSK modulation system, as follows:
00：DQPSK；
01：8DPSK；
10：16DAPSK；
11: keep.
CodingType (type of coding): this 1 bit is used for indicating channel coding method, as follows:
The 0:RS concatenated convolutional coding;
The 1:LDPC coding.
Rfu: reservation bit position (1 bit), be reservation in the future,, before definition, be made as 0.
Sub-channel field (subchannel zone): this 12 bit has been indicated the size and the chnnel coding code check of subchannel.
PL (protection rank): this 2 bit has been indicated the chnnel coding code check, as follows:
00: protection rank 1-C, expression chnnel coding code check is 1/2;
01: protection rank 2-C, expression chnnel coding code check is 2/3;
Other be that in the future use keeps.
Sub-channel Size (sub-channel size): this 10 bit regions is encoded to signless binary number (scope 1 to 864), has provided the capacity unit number that takies according to modulation system and the subchannel of protecting rank to draw.
The block encoding configuration structure of Fig. 6 for adopting among the transmission method embodiment of the present invention.Adopt FIG0/30 to describe the subchannel information of block encoding piece in the T-MMB system in an embodiment of the present invention.
The implication of each field is following among Fig. 6:
SubChId (subchannel identifier): this 6 bit regions is encoded to signless binary number, is used for identifying certain subchannel;
Rfu: this 3 bit is to use in the future to keep, and is set to 0 at present;
FEC Start Address (FEC initial address): this 7 bit regions is encoded to signless binary number, is used for indicating the initial address that belongs to first encoding block of this subchannel in the corresponding public interleaving frame.
Fig. 7 is a T-MMB system transmissions frame structure sketch map of the present invention.As shown in Figure 7, a transmission frame of T-MMB system is by synchronizing channel (Sync), and fast information channel in dab receiver (FIC) and MSC (MSC) constitute.MSC is because several public interleaving frames (CIF) composition.
Fig. 8 is a T-MMB system transmissions frame forming process sketch map of the present invention.
T-MMB business datum as shown in Figure 8 is according to transmission mode I; The transmission of employing stream mode; The professional multimedia data stream of T-MMB according to the indication information of FIC through LDPC coding and time-interleaved (Bit Interleave) afterwards; With CU is that unit is inserted among the MSC MSC; Business such as DAB, DAB-IP and T-DMB are inserted into MSC according to the indication information of FIC according to original handling process, follow synchronizing channel and fast information channel in dab receiver to form the transmission frame of a completion together through subsequent module for processing then.
Fig. 9 is a T-MMB receiver block diagram of the present invention.
As shown in Figure 9, the step of receiving terminal comprises: radio demodulating, and the OFDM demodulation, business datum is extracted, channel decoding and source decoding.Idiographic flow is following:
Step 910 and step 911 receive data, and carry out radio demodulating and OFDM demodulation, obtain transmission frame.
In this step, radio demodulating and the OFDM demodulation of carrying out corresponding reception data according to the method for DAB system get final product, and repeat no more here.
In this step, receiver at first obtains the professional indication information of transmitting terminal according to FIG0/2: service identification (SId), transmission mode sign (TMId), subchannel sign information such as (SubChId).
Receiver utilizes the relevant information of FIG0/2 to remove to search FIG0/1, FIG0/3, FIG0/13 and FIG0/15 again.The particular content of FIG0/1 and FIG0/3 is referring to ETSI EN 300 401 V1.4.1 (2006-06).
Obtain information in user's application type (User Application Type) and the user's application data (User Application data) that receiver can be in FIG0/13 about Added Business indication and source encoding.
The T-MMB receiver obtains about information such as subchannel sign, initial address, modulation type, type of coding and the sub-channel size of Added Business and protection class through FIG0/15.
What the T-MMB receiver judged that transmitting terminal adopts according to type of coding among the FIG0/15 (Coding Type) is RS+ convolutional encoding or LDPC coding, if adopt the LDPC coding also need indicate the positional information of encoding block with FIG0/30.FEC Start Address field is used for being used for indicating corresponding public interleaving frame to belong to the initial address of first encoding block of this subchannel among the FIG0/30.
Step 913 according to the information of extracting in the step 912 such as FIG0/2, FIG0/1, FIG0/3, FIG0/15 and FIG0/30, is carried out channel-decoding to the related service data.
Step 914 utilizes information such as FIG0/13 that the dateout of step 913 is carried out source coding.
Because DAB signal and T-DMB signal transmission structure remain unchanged, therefore, when the user was DAB, DAB-IP or T-DMB receiver, receiver can be handled the corresponding service signal, but can not handle the T-MMB service signal.And the T-MMB receiver can be handled DAB, DAB-IP, T-DMB and four kinds of service signals of T-MMB, also can individual processing T-MMB service signal, so, the complete Compatiable DAB of T-MMB system, DAB-IP and T-DMB system.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention, all any modifications of within spirit of the present invention and principle, being made, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the data transmission method of a compatible multistandard in ground mobile multimedia broadcasting system comprises:
Keep DAB and T-DMB system configuration constant; The T-MMB business datum is independently carried out source encoding, chnnel coding, time-interleaved and modulation, and digital audio broadcasting DAB, digital audio broadcasting DAB-IP, T-DMB T-DMB and ground mobile multimedia broadcast T-MMB business datum are embedded among the DAB main business channel MSC with time-multiplexed mode;
Professional for T-MMB, according to the modulation system of business datum, confirm the size of capacity corresponding unit CU among the MSC;
In fast information channel in dab receiver FIC, increase professional indication, MSC and FIC data are formed transmission frame, send according to predetermined frequency band through rf modulations then with preassigned pattern to T-MMB;
DAB, DAB-IP and T-DMB receiver are handled the corresponding service signal respectively, and the T-MMB receiver is handled DAB, DAB-IP, T-DMB and four kinds of service signals of T-MMB, and the T-MMB receiver also receives separately and handles the T-MMB service signal.
2. data transmission method according to claim 1 is characterized in that, when type of service was the T-MMB business, the said channel coding method that the business datum that receives is carried out was: cascaded code or low-density checksum LDPC sign indicating number.
3. data transmission method according to claim 1; It is characterized in that; When type of service was the T-MMB business, the size of corresponding CU was among said definite MSC: n * 32bits, and wherein on behalf of business datum, n=2 use the DQPSK modulation system; On behalf of business datum, n=3 use the 8DPSK modulation system, and on behalf of business datum, n=4 use the 16DAPSK modulation system.
4. data transmission method according to claim 1 is characterized in that, further comprises: in fast information channel in dab receiver FIC, expand among the FIG type 0 mode of extension 2-FIG0/2 audio service component type ASCTy and DSCTy DSCTy.
5. data transmission method according to claim 1 is characterized in that, further comprises: in FIC, expand among the FIG type 0 mode of extension 13-FIG0/13 user's application message and user's application data.
6. data transmission method according to claim 1 is characterized in that, further comprises: newly-increased FIG type expansion in FIC, the professional subchannel characteristic of T-MMB is described.
7. data transmission method according to claim 1 is characterized in that, further comprises: newly-increased FIG type expansion in FIC, the positional information that the T-MMB business adopts LDPC coding time block code block is described.
8. data transmission method according to claim 1 forms transmission frame with preassigned pattern with MSC and FIC data, sends according to predetermined frequency band through rf modulations then.
9. data transmission method according to claim 1 is characterized in that, further comprises:
DAB, DAB-IP and T-DMB receiver are handled signal separately respectively; The T-MMB receiver extracts professional indication information to FIC decoding back from FIG, be used for receiving separately handling the T-MMB service signal; Or one of handle in DAB, DAB-IP, T-DMB and the T-MMB service signal at least.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010102186030A CN101902629B (en) | 2006-12-08 | 2006-12-08 | Data transmission method of terrestrial mobile multimedia broadcasting system |
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| CN2010102186030A CN101902629B (en) | 2006-12-08 | 2006-12-08 | Data transmission method of terrestrial mobile multimedia broadcasting system |
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| CN 200610161929 Division CN101022436A (en) | 2006-12-08 | 2006-12-08 | Compatible multistandard transmission realizing method in T-MMB system |
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| CN101902629B true CN101902629B (en) | 2012-05-30 |
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| US10425110B2 (en) | 2014-02-19 | 2019-09-24 | Samsung Electronics Co., Ltd. | Transmitting apparatus and interleaving method thereof |
| KR101800409B1 (en) * | 2014-02-19 | 2017-11-23 | 삼성전자주식회사 | Transmitting apparatus and interleaving method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1288330A (en) * | 2000-08-25 | 2001-03-21 | 清华大学 | Ground digital multimedia TV broadcasting system |
| CN1578422A (en) * | 2003-07-25 | 2005-02-09 | Lg电子有限公司 | Apparatus and method for transmitting/receiving information in a digital multimedia broadcast service |
| CN1758767A (en) * | 2004-10-06 | 2006-04-12 | 三星电子株式会社 | In digital audio broadcast system, provide and receiver, video service method and equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1288330A (en) * | 2000-08-25 | 2001-03-21 | 清华大学 | Ground digital multimedia TV broadcasting system |
| CN1578422A (en) * | 2003-07-25 | 2005-02-09 | Lg电子有限公司 | Apparatus and method for transmitting/receiving information in a digital multimedia broadcast service |
| CN1758767A (en) * | 2004-10-06 | 2006-04-12 | 三星电子株式会社 | In digital audio broadcast system, provide and receiver, video service method and equipment |
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