CN101222276B - Single frequency net system, multiplexer and data transmission method in mobile multimedia broadcast - Google Patents
Single frequency net system, multiplexer and data transmission method in mobile multimedia broadcast Download PDFInfo
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- CN101222276B CN101222276B CN 200810057330 CN200810057330A CN101222276B CN 101222276 B CN101222276 B CN 101222276B CN 200810057330 CN200810057330 CN 200810057330 CN 200810057330 A CN200810057330 A CN 200810057330A CN 101222276 B CN101222276 B CN 101222276B
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Abstract
The invention discloses a single frequency network system and a multiplexer in mobile multimedia broadcasting and a data transmission method; in the single frequency network system, data is mapped on a time slot and sent out by an emitter; the method comprises the following steps: (1) control information corresponding to each time slot is packaged to a time slot description data packet by the multiplexer; data corresponding to each time slot is packaged to a time slot load data packet; (2) when multiplex code stream is output by the multiplexer, the time slot description data packet and the time slot load data packet corresponding to each time slot are transmitted in a second in turn by the multiplexer. Through adopting the single frequency network system, the multiplexer and the data transmission method of the invention, the multiplexer outputs the code stream more uniformly and is propitious to have code rate evaluation and matching by a code rate adapter of the multiplex code stream; the invention adopts the time slot description data packet as time slot alternation, can achieve the emitter more conveniently and also improves the anti-jamming performance of the emitter.
Description
Technical field
The invention belongs to the China mobile multi-media broadcasting technology field, relate in particular to mono-frequency network system, multiplexer and data transmission method in a kind of mobile multimedia broadcast system.
Background technology
In mobile multimedia broadcast system, in order to reduce the power consumption of receiving system, usually the every frame of multi-media broadcast physical layer signal need to be divided into a plurality of time slots, emitter is according to programs code check size, described program map is launched at one or several time slot, receiving system only needs to open receive channel at corresponding time slot when watching a certain programs.With reference to shown in Figure 1, be existing CMMB (ChinaMobile Multimedia Broadcasting, China Mobile multimedia broadcasting system) single frequency network data transmission format schematic diagram.Existing CMMB single frequency network data transmission format is divided into groups according to program stream, multiplexer 10 is multiplexed into the program stream of input on the different time-gap, as among the figure program 1 being multiplexed on time slot 0 and the time slot 1, program 2 is multiplexed on time slot 2, time slot 3 and the time slot 4, program K is multiplexed on time slot 37, time slot 38, the time slot 39, then according to the Sequential output multiplexing code stream of program.As seen, the time slot that each program may need to be mapped to different numbers sends, and simultaneously also may have the not occupied situation of certain time slot, so can cause the code check shake of the code stream exported larger.
With reference to shown in Figure 2, be the multiplexing code stream output form schematic diagram in the existing CMMB single frequency network one second.Show a typical CMMB transport stream.The multiplexing code stream of multiplexer 10 per seconds output is comprised of the packet of three types, be divided into time descriptor bag (Time of day is hereinafter to be referred as the TOD bag), multiplexed frame descriptor bag (hereinafter to be referred as the MFD bag), multiplexed frame packet (PLD).Wherein the TOD bag is used to indicate the temporal information of current data, and the MFD bag is used to indicate the multiplexed information of current program, comprises shared number of timeslots, modulating mode, mapped mode, coding mode etc., and the PLD bag is used for transmitting the data of corresponding program.
And the output intent of existing multiplexing code stream data is: exported first a TOD bag in one second, export successively MFD bag and the PLD bag of every programs again.After above-mentioned multiplexing code stream data were input to transmitter, transmitter need to be deciphered in real time to program description, namely will resolve the MFD bag in real time, then calculated data volume corresponding to each time slot, repartitioned boundary of time slot.And then data allocations sent on corresponding time slot.
With reference to shown in Figure 3, be the structural representation of mono-frequency network system, described mono-frequency network system is mainly by the multiplexer 10 of central station and multiplexing code stream rate adaption device 11, distributed optical network 12---also can be described as program distribution network and several transmitters 13 form.
As shown in the figure, the multiplexing code stream of exporting from multiplexer 10 carries out rate adaption through multiplexing code stream rate adaption device 11 first, then is delivered to different transmitter 13 by optical-fiber network 12, sends after transmitter 13 recovers.
From the above, existing CMMB single frequency network data transmission format is according to the Sequential output of program, and the method is brought following shortcoming:
1, owing to transmit according to program, the code check shake of the code stream of multiplexer output is larger, is unfavorable for rate estimation and the recovery of multiplexing code stream rate adaption device.
2, owing to transmit according to program, and the time slot that each program may need to be mapped to different numbers sends, therefore transmitter need to be deciphered in real time to program description, then calculate data volume corresponding to each time slot, repartition boundary of time slot, and then with data allocations on corresponding time slot, increased the complexity of transmitter.
3, owing to transmit according to program, if there is error of transmission, then can affect the transfer of data in the whole program.
Summary of the invention
Technical problem to be solved by this invention provides mono-frequency network system, multiplexer and the data transmission method in a kind of mobile multimedia broadcast system, is beneficial to the rate adaption of multiplexing code stream rate adaption device.
In order to solve the problems of the technologies described above, the invention provides the data transmission method of mono-frequency network system in a kind of mobile multimedia broadcast system, emitter sends data-mapping at time slot in described mono-frequency network system, said method comprising the steps of:
(1) control information that multiplexer is corresponding with each time slot is packaged into time slot data of description bag, and the data encapsulation that each time slot is corresponding becomes time slot load data bag;
(2) multiplexer transmitted time slot data of description bag corresponding to each time slot and time slot load data bag successively in one second when the output multiplexing code stream.
Further, described method is further comprising the steps of:
(3) after emitter receives described multiplexing code stream, find slot time according to described time slot data of description bag, and after according to the control information that described time slot data of description bag comprises the time slot load data in the described time slot being processed, described time slot load data is mapped on the corresponding time slot sends.
Further, described control information comprise modulation system, mapping mode, coded system, timeslot number, second postpone, any one or two or more combination in any in the time descriptor.
In order to solve the problems of the technologies described above, the present invention also provides the mono-frequency network system in a kind of mobile multimedia broadcast system, described mono-frequency network system comprises multiplexer, multiplexing code stream rate adaption device, distributed optical network and emitter, described multiplexer is used for the program receiving data, and with the data-mapping of each program to different time-gap, described multiplexer also is used for the control information that each time slot is corresponding and is packaged into time slot data of description bag, and the data encapsulation that each time slot is corresponding becomes time slot load data bag, and when the output multiplexing code stream, in one second, transmit successively time slot data of description bag corresponding to each time slot and time slot load data bag.
Further, described emitter is used for after receiving described multiplexing code stream, find slot time according to described time slot data of description bag, and after according to the control information that described time slot data of description bag comprises the time slot load data in the described time slot being processed, described time slot load data is mapped on the corresponding time slot sends.
Further, described control information comprise modulation system, mapping mode, coded system, timeslot number, second postpone, any one or two or more combination in any in the time descriptor.
In order to solve the problems of the technologies described above, the present invention also provides a kind of multiplexer, comprise data receiver unit, time slot allocating unit, data processing unit, reach the data output unit, described data receiver unit is used for the program receiving data, described time slot allocating unit is used for the data-mapping of each program is arrived different time slots, described data processing unit is used for the control information that each time slot is corresponding and is packaged into time slot data of description bag, and the data encapsulation that each time slot is corresponding becomes time slot load data bag.
Further, described data output unit is used for transmitting successively time slot data of description bag corresponding to each time slot and time slot load data bag in one second when the output multiplexing code stream.
Further, described control information comprise modulation system, mapping mode, coded system, timeslot number, second postpone, any one or two or more combination in any in the time descriptor.
Mono-frequency network system provided by the invention, multiplexer and data transmission method bring following advantage: transmitting data stream transmits according to time slot, like this with the data allocations that sends in the per second on each time slot, output code flow is more average, is conducive to multiplexing code stream rate adaption device and carries out rate estimation and coupling.The emitter end can directly obtain according to the TSD bag border of time slot, has reduced the realization difficulty of emitter.Occur mistake in transmission path, owing to adopt TSD to identify the border of time slot, this mistake can not crossed over, but can be controlled in the time slot, can not diffuse to other time slot, thereby has improved the anti-interference of emitter.
Description of drawings
Fig. 1 is existing CMMB single frequency network data transmission format schematic diagram.
Fig. 2 is the multiplexing code stream output form schematic diagram in the existing CMMB single frequency network one second.
Fig. 3 is the structural representation of mono-frequency network system.
Fig. 4 is single frequency network transfer of data flow diagram of the present invention.
Fig. 5 is single frequency network data transmission method flow chart of the present invention.
Fig. 6 is drop multiplexer architecture schematic diagram of the present invention.
Embodiment
Main thought of the present invention is to make multiplexer according to the slot transmission data, like this with the data allocations that sends in the per second on each time slot, output code flow is more average, is conducive to multiplexing code stream rate adaption device and carries out rate estimation and coupling.Concrete mode is: time slot data of description bag and time slot load data bag are set, transmitted successively time slot data of description bag corresponding to each time slot and time slot load data bag in one second.
In addition, adopt mono-frequency network system of the present invention, multiplexer and data transmission method, emitter can be by time slot data of description bag as the interval, directly according to the time slot dividing data, reduce the complexity of emitter, eliminated the existing drawback of bringing by the method for program dividing data.
Below in conjunction with accompanying drawing preferred implementation of the present invention is elaborated.
With reference to shown in Figure 4, be single frequency network transfer of data flow diagram of the present invention.The single frequency network data transmission format is carried out according to time slot, need to be about to the data-mapping of transmission to send to each time slot, rather than to divide into groups by program.Multiplexer output code flow as shown in the figure comprises TSD (Time Slot Description in each time slot, time slot data of description bag) and PLD (PayLoad, time slot load data bag) two kinds of packets, wherein TSD is used for control information corresponding to each time slot of carrying (comprising modulation system, mapping mode, coded system, timeslot number, second delay, TOD information etc.), and the PLD bag is used for transmitting data corresponding to each time slot.
With reference to shown in Figure 5, be single frequency network data transmission method flow chart of the present invention.Said method comprising the steps of:
Step 501: the control information that each time slot is corresponding is packaged into time slot data of description bag, and the data encapsulation that each time slot is corresponding becomes time slot load data bag;
Described control information comprises modulation system, mapping mode, coded system, timeslot number, second postpones, any one or two or more combination in any in TOD (time descriptor) information.Can select as required in actual applications.
Step 502: multiplexer transmitted time slot data of description bag corresponding to each time slot and time slot load data bag successively in one second when the output multiplexing code stream.
Like this, for each time slot in a second, all be to export first a TSD bag, export again a PLD bag.Wherein the TSD bag is used to indicate control information corresponding to this time slot, and the PLD bag transmits data corresponding to this time slot.In one second, just each time slot is made a distinction as slot time by the TSD bag.
Step 503: after emitter receives described multiplexing code stream, find slot time according to described time slot data of description bag, and after according to the control information that described time slot data of description bag comprises the time slot load data in the described time slot being processed, described time slot load data is mapped on the corresponding time slot sends.
As seen, the present invention proposes a kind of method of transmitting data and control information according to time slot.According to time slot transmitting control information and data, the interval that utilizes control information to calibrate time slot is core point of the present invention.So long as adopt the DMB communication system by time slot transmission data can adopt this method to transmit data.
In addition, the present invention also provides a kind of new mono-frequency network system, and described mono-frequency network system comprises multiplexer, multiplexing code stream rate adaption device, distributed optical network and emitter.
Described multiplexer is except being used for the program receiving data, and with the data-mapping of each program outside different time slots, also be used for the control information that each time slot is corresponding and be packaged into time slot data of description bag, and the data encapsulation that each time slot is corresponding becomes time slot load data bag, and when the output multiplexing code stream, in one second, transmit successively time slot data of description bag corresponding to each time slot and time slot load data bag.
Described emitter is used for after receiving described multiplexing code stream, find slot time according to described time slot data of description bag, and after according to the control information that described time slot data of description bag comprises the time slot load data in the described time slot being processed, described time slot load data is mapped on the corresponding time slot sends.
Wherein, described control information comprises modulation system, mapping mode, coded system, timeslot number, second postpones, any one or two or more combination in any in the time descriptor, can select as required in actual applications.
With reference to shown in Figure 6, be drop multiplexer architecture schematic diagram of the present invention.The multiplexer 60 of mono-frequency network system of the present invention comprises data receiver unit 61, time slot allocating unit 62, data processing unit 63, reaches data output unit 64.
Described data receiver unit 61 is used for the program receiving data, and described time slot allocating unit 62 is used for the data-mapping of each program is arrived different time slots;
Described data processing unit 63 is used for the control information that each time slot is corresponding and is packaged into time slot data of description bag, and the data encapsulation that each time slot is corresponding becomes time slot load data bag, and wherein said control information comprises modulation system, mapping mode, coded system, timeslot number, second postpones, any one or two or more combination in any in the time descriptor.
Described data output unit 64 is used for transmitting successively time slot data of description bag corresponding to each time slot and time slot load data bag in one second when the output multiplexing code stream.
Mono-frequency network system of the present invention, multiplexer and data transmission method have changed the existing mode that control information and data are encapsulated, the control information that each time slot is corresponding is packaged into time slot data of description bag, and the data encapsulation that each time slot is corresponding becomes time slot load data bag, and when the output multiplexing code stream, in one second, transmit successively corresponding time slot data of description bag and the time slot load data bag of each time slot behind the described Reseal, data-mapping sends to each time slot like this, make output code flow more even, be conducive to multiplexing code stream rate adaption device and carry out rate estimation, and by described time slot data of description bag each slot time is come simultaneously, be more conducive to the processing of transmitter.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (8)
1. the data transmission method of mono-frequency network system in the mobile multimedia broadcast system, emitter sends data-mapping at time slot in described mono-frequency network system, it is characterized in that, said method comprising the steps of:
(1) control information that multiplexer is corresponding with each time slot is packaged into time slot data of description bag, and the data encapsulation that each time slot is corresponding becomes time slot load data bag;
(2) multiplexer transmitted time slot data of description bag corresponding to each time slot and time slot load data bag successively in one second when the output multiplexing code stream.
2. the method for claim 1 is characterized in that, described method is further comprising the steps of:
(3) after emitter receives described multiplexing code stream, find slot time according to described time slot data of description bag, and after according to the control information that described time slot data of description bag comprises the time slot load data in the described time slot being processed, described time slot load data is mapped on the corresponding time slot sends.
3. method as claimed in claim 1 or 2 is characterized in that, described control information comprises modulation system, mapping mode, coded system, timeslot number, second postpones, any one or two or more combination in any in the time descriptor.
4. the mono-frequency network system in the mobile multimedia broadcast system, described mono-frequency network system comprises multiplexer, multiplexing code stream rate adaption device, distributed optical network and emitter, described multiplexer comprises:
The data receiver unit is used for the program receiving data;
Time slot allocating unit is used for the data-mapping of each program is arrived different time slots;
It is characterized in that described multiplexer also comprises:
Data processing unit is used for the control information that each time slot is corresponding and is packaged into time slot data of description bag, and the data encapsulation that each time slot is corresponding becomes time slot load data bag;
The data output unit is used for transmitting successively time slot data of description bag corresponding to each time slot and time slot load data bag in one second when the output multiplexing code stream.
5. mono-frequency network system as claimed in claim 4, it is characterized in that, described emitter is used for after receiving described multiplexing code stream, find slot time according to described time slot data of description bag, and after according to the control information that described time slot data of description bag comprises the time slot load data in the described time slot being processed, described time slot load data is mapped on the corresponding time slot sends.
6. such as claim 4 or 5 described mono-frequency network systems, it is characterized in that described control information comprises modulation system, mapping mode, coded system, timeslot number, second postpones, any one or two or more combination in any in the time descriptor.
7. multiplexer, comprise data receiver unit, time slot allocating unit, data processing unit, reach the data output unit, described data receiver unit is used for the program receiving data, described time slot allocating unit is used for the data-mapping of each program is arrived different time slots, it is characterized in that, described data processing unit is used for the control information that each time slot is corresponding and is packaged into time slot data of description bag, and the data encapsulation that each time slot is corresponding becomes time slot load data bag; Described data output unit is used for transmitting successively time slot data of description bag corresponding to each time slot and time slot load data bag in one second when the output multiplexing code stream.
8. multiplexer as claimed in claim 7 is characterized in that, described control information comprises modulation system, mapping mode, coded system, timeslot number, second postpones, any one or two or more combination in any in the time descriptor.
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| EP1391090A1 (en) * | 2001-05-28 | 2004-02-25 | Infineon Technologies AG | Data transmission system having a high data transmission rate |
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| EP1391090A1 (en) * | 2001-05-28 | 2004-02-25 | Infineon Technologies AG | Data transmission system having a high data transmission rate |
| CN1513245A (en) * | 2001-05-28 | 2004-07-14 | �����ɷ� | Data transmission system having high data transmission rate |
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