CN101056381A - Method for transferring the program data stream in the mobile video broadcast system - Google Patents
Method for transferring the program data stream in the mobile video broadcast system Download PDFInfo
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- CN101056381A CN101056381A CN 200610060852 CN200610060852A CN101056381A CN 101056381 A CN101056381 A CN 101056381A CN 200610060852 CN200610060852 CN 200610060852 CN 200610060852 A CN200610060852 A CN 200610060852A CN 101056381 A CN101056381 A CN 101056381A
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Abstract
The invention relates to a method of transmitting program data streams in a mobile video broadcast system, the system broadcasts multiple groups of video programs, wherein each group of program corresponds to a logic channel, and the method comprises allocating the groups of programs to different sub-carrier groups to transmit, continuously regulating mapping relations between logic channels corresponding to the program data and the sub-carrier groups, and keeping synchronization of mapping relations between an emitter and a receiver. The method of the invention can prevent the data of a same program from being on a frequency band with big fading for a long time, thereby improving the capability of the system to resist frequency selective channels, furthermore, improving the scheduling flexibility and utilization ratios of frequencies and time resource due to different program data being allocated to different sub-carrier groups.
Description
Technical field
The present invention relates to mobile video broadcast, more particularly, relate to a kind of method of in mobile video broadcast system, transmitting program data stream.
Background technology
Development through more than ten years, the research of digital TV Broadcasting Techniques and application have obtained a large amount of achievements, from satellite digital TV (with the DVB-S in Europe, DVB-S2, the S-DMB of Korea S and Japan is representative), cable digital TV (DVB-C with Europe is representative), terrestrial DTV is (with the DVB-T in Europe, the ATSC of the U.S., the IDSB-T of Japan, the DMB-T of China etc. are representative) until mobile video broadcast (with the DVB-H in Europe, the FLO of QualCom company is representative), obtained to use widely in many countries and regions, obtained plentiful and substantial society and economic benefit.
The mobile video broadcast technology that Digital Television and mobile communication combine is owing to combine the characteristics of Digital Television and mobile communication, can satisfy the needs that people receive TV service whenever and wherever possible, has huge development potentiality, be considered to become " killer's level business " of next mobile communication, thereby be subjected to each side and more and more pay attention to.For example, the DVB-H standard has been developed in Europe on existing DVB-T standard base, and the Qualcomm of the U.S. then releases the FLO technology to meet the challenge of this respect.
Compare with existing satellite, ground, cable digital TV broadcast technology, the new challenge that the mobile video broadcast technology faces is the property complicated and changeable of mobile communication environment, especially under the frequency-selective channel that multi-path environment causes, the bit error rate performance of system can be subjected to very big influence, and prior art generally all is by reduce the influence of frequency-selective channel based on the channel estimating of pilot tone and equilibrium and forward error correction coding.
The Europe etsi standardization is organized in has released the DVB-H standard in November, 2004 on the DVB-T standard, Norkia company has correspondingly released Nokia 7700 mobile phones, and has carried out the pilot office test at Berlin, Germany.
The DVB-H standard is mainly introduced the MPE-FEC encapsulation after source encoding on the DVB-T standard, encode by increase RS and improve the error correcting capability of received signal.
The DVB-H standard has also been introduced time slicing and Delta-t technology simultaneously, is divided into a burst (BURST) stream by the information source data that will send and transmits, and receiver can cut out radio circuit between the different B URST, thereby saves the energy consumption of terminal.Specifically can send schematic diagram referring to BURST stream shown in Figure 1, B is certain professional BURST among the figure, and Delta-t is two time intervals between the BURST.
Fig. 2 shows the time-multiplexed example of the timeslice of different programs among the DVB-H.Among the DVB-H, distinguishing between the BURST of the different programs stream is to realize by the process identification number (PID) of mpeg 2 transport stream (TS stream) in the information source side.For terminal, when receiving on the one hand needed programme signal, must wait until that source coding just can find the original position of needed program data BURST later on, BURST between the different programs does not have clear and definite time and frequency limit, and lock in time and program are longer switching time when causing program receiving; All on the other hand data subcarriers are taken fully by a program data, and it is bigger to cause dispatching granularity, can not realize dispatching flexibly and improve utilization ratio to frequency and time resource.In addition, can only come the decline of contrary frequency selectivity by forward error correction coding and balancing technique in this case.
Summary of the invention
The technical problem to be solved in the present invention is that decline of said frequencies selective channel and the big defective of scheduling granularity at prior art provide a kind of method of transmitting program data stream.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method of transmitting program data stream in mobile video broadcast system is provided, this system broadcasts is organized video frequency program more, the data flow of described program adopts the BURST mode to send, wherein the data flow of each group program is corresponding to a logic channel, it is characterized in that described method comprises:
The pairing logic channel of data flow of each group program is mapped on one group of subcarrier;
In broadcasting process, constantly adjust the mapping relations between pairing logic channel of program data stream and the sub carrier group; And
Between transmitter and receiver, keep the synchronous of described mapping relations.
In the method for the invention, the mapping relations between described adjustment logic channel and the sub carrier group are to adjust according to predetermined algorithm.
In the method for the invention, the time interval of the mapping relations between described adjustment logic channel and the sub carrier group is fixed.
In the method for the invention, the time interval of the mapping relations between described adjustment logic channel and the sub carrier group changes.
In the method for the invention, the time interval of the mapping relations between described adjustment logic channel and sub carrier group is under the situation of fixing, the described maintenance between transmitter and receiver comprising synchronously of described mapping relations: transmitter and receiver changes mapping relations by the time interval of agreement simultaneously according to predetermined hop algorithm.
In the method for the invention, in the time interval of the mapping relations between described adjustment logic channel and the sub carrier group is under the situation about changing, and describedly keeps comprising synchronously of described mapping relations between transmitter and receiver: utilize the time that transmission parameter control signaling arrives the next BURST of each logic channel and the sub carrier group sequence number notice receiver of mapping.
In the method for the invention, described transmission parameter control signaling takies one group of subcarrier in the employed effective subcarrier of OFDM symbol separately, and all signaling informations have passed in a physical frame.
In the method for the invention, one or several signaling symbols of taking separately in the physical frame of described transmission parameter control signaling transmits.
Implement the method for in mobile video broadcast system, transmitting program data stream of the present invention, have following beneficial effect: the data that prevent same program are on the bigger subcarrier of decline for a long time, thereby the ability of raising system opposing frequency-selective channel, and because different program datas is assigned to different sub carrier group, thereby scheduling flexibly, improved the utilance of frequency and time resource.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the schematic diagram that the information source data flow adopts BURST stream to send in the prior art;
Fig. 2 is the time-multiplexed exemplary plot of the timeslice of different programs in the prior art;
Fig. 3 is the flow chart of the present invention in the method for transmission program data stream in mobile video broadcast system;
Fig. 4 is a block diagram of implementing the mobile video broadcast system of the inventive method;
Fig. 5 is the mapping schematic diagram that arrives sub carrier group according to the logic channel of the embodiment of the invention;
Fig. 6 is the schematic diagram according to a kind of mapping mode of transmission parameter control (TPS) signaling on physical layer of the embodiment of the invention;
Fig. 7 is the schematic diagram according to the another kind of mapping mode of transmission parameter control (TPS) signaling on physical layer of the embodiment of the invention.
Embodiment
The present invention is directed to ability that in mobile video broadcast, improves the contrary frequency selective channel and the needs that improve dispatching flexibility, the BURST of different program datas is assigned on the different sub carrier group transmits, adjust the logic channel of program data correspondence and the mapping relations between the sub carrier group according to certain algorithm, the data that prevent same program are on the bigger subcarrier of decline for a long time, thus the ability of raising system opposing frequency-selective channel.
Fig. 3 is the method for program data stream is transmitted in the present invention in mobile video broadcast system a flow chart.The many groups of common mobile video broadcast system broadcasting video frequency programs adopt time slicing techniques, promptly send the data flow of program in the BURST mode, logically each are organized the data flow of program corresponding to a logic channel.As shown in Figure 3, method of the present invention in step 310 just each the group program the pairing logic channel of data flow be mapped on one group of subcarrier.In step 320, constantly adjust the mapping relations between pairing logic channel of program data and the sub carrier group in the system broadcasts process.In step 330, variation has taken place in the mapping relations between logic channel and sub carrier group, keeps synchronously between transmitter and receiver.
Method of the present invention can be implemented in mobile video broadcast system shown in Figure 4, and this system comprises following part: message-source adapted device, scrambling module, code interleaving module, planisphere mapping block, time-frequency Multiplexing module, TPS signaling and pilot signal generation module, inverse fast fourier transform (IFFT) module, protection be (GI) insert module, D/A modular converter and radio-frequency module at interval.Below respectively the work of each module is described.
1) message-source adapted device
There is N program to broadcast in the system, partly finish the packing encapsulation function at the message-source adapted device.
According to the largest buffered of the playback rate and the handheld terminal of each information source, can determine that N program carries out multiplexing time interval Tmux, Tmux also is the length of a superframe.
According to the time interval of N program multiplexing and the playback rate of information source, can determine that each program source carries out the segmented data blocks size.After program data carried out segmentation, the data segment of each program is encapsulated, encapsulation format can adopt the MPE-FEC encapsulation, also can adopt the encapsulation of TS stream, or other encapsulation format.Can in the packet of encapsulation, point out the transmitting time and the sub carrier group sequence number of the next data segment of this program.
2) scrambling module
The data segment that encapsulates each later program is carried out scrambling, realize energy dissipation.
3) code interleaving module
Data after the scrambling are encoded and interweaved the anti-fading and interference capability of raising system.The code interleaving mode that adopts can be encode outward, interweave outward, interior coding, in the combination that interweaves, also can only adopt to encode add the mode that interweaves.
The former can be with reference to existing DVB-T or DVB-H system, adopt RS coding, convolutional interleave, convolutional encoding, in the integrated mode that interweaves.
The latter can adopt high performance coded system, the combination of encoding+interweaving as LDPC.
Different program datas can adopt different code rates to encode according to its content characteristic and requirement.
4) planisphere mapping block
The data flow of different programs is carried out the planisphere mapping, and the mode of the data flow mapping of different programs can be different, comprises QPSK, 8PSK, 16QAM, 64QAM etc.
5) formation of the multiplexing and superframe data of time-frequency
The data flow correspondence of each program a logic channel, and the data on logic channel are multiplexed into data carried by data on the superframe by time-division and frequency division mode, and the data stream format after multiplexing as shown in Figure 5.Shown in figure, owing to the data rate of different program source, the mapping mode flexible configuration as required of encoding, last each program data block size in a superframe also can be different.Content on each data block is exactly a data carried by data on the timeslice.
As shown in Figure 5, supposing the system will be broadcasted 12 programs, respectively corresponding 12 different timeslices, and the data carried by data block size can be different according to the difference of its information source speed, code rate, planisphere mapping mode on each timeslice.A physical frame is represented in unit of abscissa, and a sub carrier group is represented in unit of ordinate.The tentation data subcarrier can be divided into 4 different sub carrier group, and the number of sub carrier wave that comprises in every group is M.For avoiding the influence of frequency selective fading, sub carrier group sub-carriers discontinuous as far as possible distribution on frequency domain, a kind of possible method of salary distribution is as follows:
l＝m*N+n，l＝0，…，L-1，n＝0，…N-1，m＝0，…，M-1
Wherein L is all data subcarrier sums, and l is the sequence number of data subcarrier.
N is the sequence number of sub carrier group, and N is the sub carrier group number.
M is the sequence number of each subcarrier in the sub carrier group, and M is the total number of sub-carriers that comprised in the sub carrier group.
6) TPS signaling and pilot signal
Data block after the time division multiplexing is that TPS signaling and the common composition of pilot signal that unit and system generate is the modulating unit of unit with carrying data on the OFDM symbol with an OFDM symbol.Can be chosen in and point out the time that the next BURST of each logic channel arrives and the subcarrier sequence number of mapping in the TPS signaling.
7)IFFT
Data carried by data on each OFDM symbol is carried out the IFFT conversion, realize the OFDM modulation.
8) GI inserts
To inserting protection (GI) at interval on the data block of each OFDM symbols carry after the IFFT conversion.The content of the last filling of GI can be Cyclic Prefix (CP), also can fill 0, and PN sign indicating number that also can certain form is filled, or the permutation and combination of above several modes.
9) D/A conversion and radio frequency
Send radio-frequency module to after the later data D/A of OFDM modulation changes, send to each user.
In sum, the present invention mainly is that the formation of and superframe data multiplexing at time-frequency and frame structure and TPS signaling design several respects have been made improvement to prior art.
In the present invention, frame structure and TPS signaling design as follows:
Only carry the data of a program source on timeslice.A timeslice is made of several frames, the number of frame depend on the size of program segments, code rate, planisphere mapping mode and the sub carrier group of being shone upon in the subcarrier number that comprises.
Point out the programme content (representing) of this timeslice correspondence on transmission parameter control (TPS) signaling, the code rate of employing, planisphere mapping mode by the timeslice flag bit.Also can point out the time of advent of the next timeslice of this program on the TPS signaling.As long as receiver find receive timeslice sign in the physical frame, just can judge that whether this timeslice belongs to is the program of its required reception.
A timeslice is made up of several frames, finds the program of required reception when receiving for realization rapidly, and the timeslice leader will on the different physical frames of sheet can be set to different value at the same time.The programme content that timeslice leader will on the 1st frame of each timeslice indicates this timeslice (or following several one timeslices) to be carried, the timeslice leader will on all the other frames is made as a not particular value of corresponding any programme content.
The be mapped with dual mode of TPS signaling on physical layer realizes that difference as shown in Figure 6 and Figure 7.
As shown in Figure 6, the TPS signaling takies one group of subcarrier in the employed effective subcarrier of OFDM symbol separately, and all TPS signaling informations have passed in a frame.
As shown in Figure 7, one or several signaling symbols of taking separately in the physical frame of TPS signaling transmits.
Claims (8)
1, a kind of method of in mobile video broadcast system, transmitting program data stream, this system broadcasts is organized video frequency program more, and the data flow of described program adopts the BURST mode to send, and wherein the data flow of each group program is corresponding to a logic channel, it is characterized in that described method comprises:
The pairing logic channel of data flow of each group program is mapped on one group of subcarrier;
In broadcasting process, constantly adjust the mapping relations between pairing logic channel of program data stream and the sub carrier group; And
Between transmitter and receiver, keep the synchronous of described mapping relations.
2, method according to claim 1 is characterized in that, the mapping relations between described adjustment logic channel and the sub carrier group are to adjust according to predetermined hop algorithm.
3, method according to claim 2 is characterized in that, the time interval of the mapping relations between described adjustment logic channel and the sub carrier group is fixed.
4, method according to claim 2 is characterized in that, the time interval of the mapping relations between described adjustment logic channel and the sub carrier group changes.
5, method according to claim 3 is characterized in that, the described maintenance between transmitter and receiver comprising synchronously of described mapping relations: transmitter and receiver changes mapping relations by the time interval of agreement simultaneously according to predetermined hop algorithm.
6, method according to claim 4, it is characterized in that described between transmitter and receiver, the maintenance comprising synchronously of described mapping relations: utilize the time that transmission parameter control signaling arrives the next BURST of each logic channel and the sub carrier group sequence number notice receiver of mapping.
7, method according to claim 6 is characterized in that, described transmission parameter control signaling takies one group of subcarrier in the employed effective subcarrier of OFDM symbol separately, and all signaling informations have passed in a physical frame.
8, method according to claim 6 is characterized in that, one or several signaling symbols that described transmission parameter control signaling takies separately in the physical frame transmits.
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| CN 200610060852 CN101056381A (en) | 2006-05-24 | 2006-05-24 | Method for transferring the program data stream in the mobile video broadcast system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102833044A (en) * | 2012-08-29 | 2012-12-19 | 苏州威士达信息科技有限公司 | Combined processing device and method of RS (reed-solomon) encoding and byte interlacing in CMMB (China mobile multimedia broadcasting) system |
| CN103430480A (en) * | 2013-02-26 | 2013-12-04 | 华为技术有限公司 | Transmission method of scheduling information, terminal, and fusion server |
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2006
- 2006-05-24 CN CN 200610060852 patent/CN101056381A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102833044A (en) * | 2012-08-29 | 2012-12-19 | 苏州威士达信息科技有限公司 | Combined processing device and method of RS (reed-solomon) encoding and byte interlacing in CMMB (China mobile multimedia broadcasting) system |
| CN102833044B (en) * | 2012-08-29 | 2014-12-10 | 苏州威士达信息科技有限公司 | Combined processing device and method of RS (reed-solomon) encoding and byte interlacing in CMMB (China mobile multimedia broadcasting) system |
| CN103430480A (en) * | 2013-02-26 | 2013-12-04 | 华为技术有限公司 | Transmission method of scheduling information, terminal, and fusion server |
| CN103430480B (en) * | 2013-02-26 | 2016-09-28 | 华为技术有限公司 | The transmission method of schedule information, terminal and converged services device |
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Open date: 20071017 |