CN101304524A - Method and device for transmitting and receiving mobile multimedia broadcast - Google Patents
Method and device for transmitting and receiving mobile multimedia broadcast Download PDFInfo
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Abstract
The invention discloses a method and a device for sending and receiving mobile multimedia broadcasting. The sending method includes: a sending terminal receives one-path or multi-path multimedia broadcasting service data of a user; first processing is carried out to generate data frames; the control information of the user is received; second processing is carried out to generate control frames; time slots are composed by time-slot synchronizing channels and the data frames; service channels are composed by the time slots; control channels are composed by the control frames; second frames by are composed second frame synchronizing channels, the service channels and the control channels; post treatment of baseband and post emission of frequency conversion are carried out for the second frames. The receiving method includes: the second frame synchronizing channels are received to obtain synchronizing second frames; the service channels and the control channels are separated from the second frames; the time slots are separated from the service channels; the control frame are separated from the control channels; the data frames are separated from the time slots; third processing is carried out for the data frames; fourth processing is carried out on the control frames; the one-path or multi-path multimedia broadcasting service data are obtained after the third processing of the data frames is finished.
Description
Technical field
The present invention relates to the digital television information transmission technique field, particularly a kind of Mobile Multimedia Broadcasting sends and the method and apparatus that receives.
Background technology
Mobile Multimedia Broadcasting be via satellite with the terrestrial wireless broadcast mode, for moving receiving equipments such as portable handheld terminal such as mobile phone, PDA (Personal Digital Assistant, personal digital assistant), MP3, MP4, digital camera, notebook computer, receive professional system such as broadcast TV program and information service whenever and wherever possible, it is the product that mobile communication and digital TV Broadcasting Techniques merge.As a kind of new information service mode and medium form, it has brought new opportunity to develop to information industry, and existing industrial policy and control mode are proposed new change requirement.The main technical issues that need to address of Mobile Multimedia Broadcasting have:
(1) moves portable reception and low-power consumption
No matter be the automobile of middle low cruise, the pedestrian of microinching, or the bullet train of speed per hour hundreds of km; No matter be the densely covered city of high building, the suburb of open spaciousness, or tunnel, mountain region culvert, all requirement can receive steady and audible multi-medium data.Simultaneously, also must constantly reduce the complexity and the power consumption of receiver, to satisfy the miniaturization needs of equipment such as handheld terminal.
(2) conserve on spectrum
Improve the availability of frequency spectrum to greatest extent, saved signal bandwidth; Support single frequency network (SFN, SingleFrequency Network) simultaneously, realized that each transmitting station uses the same set of program of same frequency emission at synchronization, transmitting power is low, and electromagnetic radiation is little, and continuous increase coverage territory, improves the availability of frequency spectrum.
(3) network design flexibility
When being implemented in country, interzone roaming, more exchange device just can be finished the timely switching of network and system, is fit to the various transmission and the channel width in country variant and area, reduces design cost, utilizes same design to release product, has shortened the launch cycle.
The Mobile Multimedia Broadcasting standard of comparative maturity mainly contains following 4 kinds in the industry at present:
(1) European DVB-H
Early several years ago, Europe digital video broadcasting (DVB, Digital Video Broadcast) tissue has just been inquired into DVB-UMTS (Universal Mobile Telecommunications System, universal mobile telecommunications system) integrated possibility, European DVB-T (the Terrestrial Digital Multimedia Broadcasting in early stage, T-DMB) standard is in order to adapt to different requirements, be provided with variable parameter, these parameter adaptation narrow range, main still at the fixing reception of indoor and outdoor, anti-impulse disturbances is indifferent, and does not consider electricity-saving function, for portable handheld device and inapplicable.
Therefore, European DVB has organized to set up the DVB-H at handheld device (Digital VideoBroadcasting-Handheld, the digital video broadcasting-hand-hold type receives) standard in later stage.2004, DVB steering committee defined and has passed through the DVB-H standard, carries out System Verification Test in some cities just according to plan at present, such as Berlin, Germany, Helsinki and pittsburgh,U.S.A etc.
(2) S-DMB and the T-DMB of Japan, Korea S
Japan and Korea S use based on digital audio broadcasting (DAB, Digital Audio Broadcasting) T-DMB of technical standard (Terrestrial Digital Multimedia Television Broadcasting, ground digital multimedia TV broad cast) standard, also has satellite-based S-DMB (Satellite Digital MultimediaBroadcasting, the satellite digital multi-media TV broadcasting) mobile TV standard is just carried out commercial operation in Korea S at present.
(3) MediaFLO of QualCom company
QualCom has been released the proprietary MediaFLO scheme based on OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology, carries out the test of mobile TV Operation Network in the North America.
(4) based on the mobile TV of 3G technology
Improve and improve and have the 3G mobile communication system now.3GPP (3rd Generation Partnership Project, third generation partner program) tissue has been recognized the importance of broadcasting and multicast for a long time, and paid effort for this reason, MBMS (Multimedia Broadcast/Multicast Service, multimedia broadcast/multi broadcast business) has been proposed.MBMS comprises broadcasting and two patterns of multicast, and broadcast mode approaches digital television business, and the multicast pattern is absorbed in and be positioned group business.China Mobile, CHINAUNICOM are at GSM (Global System for MobileCommunications, global system for mobile communications), correlation test and operation have been done on CDMA (Code Division Multiple Access, the code division multiple access) network, because mobile TV signal demand great amount of data transmission bandwidth, the technological means and the operation that can't become mass consumption now are professional.
Above international Mobile Multimedia Broadcasting standard all exists the weak point of different levels when solving the problem that Mobile Multimedia Broadcasting faced, performance remains further to be improved: DVB-H inherits in DVB-T (fixing or portable receiving system), very limited at the space of mobile environment optimization on this basis, DVB-H can not provide enough power-save mechanism for receiver simultaneously, some other performance index have also been sacrificed, as increasing to 5 seconds switching time.The T-DMB availability of frequency spectrum is low, can not provide enough information throughputs to serve to satisfy the multichannel high quality multimedia, and T-DMB does not provide enough power-saving measures for receiver yet simultaneously.MediaFLO is the system that is independently proposed by high pass, does not have a compatibility, is primarily aimed at the design of 700MHz frequency at present, and promoted extension is limited.The appearance of the mobile TV MBMS standard of 3G standard also will be waited for a period of time, and mobile TV can take the great amount of data transmission bandwidth.
Summary of the invention
In order to send and the receiving multimedia broadcast business datum effectively in mobile environment, the embodiment of the invention provides a kind of Mobile Multimedia Broadcasting to send and the method and apparatus that receives.Described technical scheme is as follows:
On the one hand, the method that the embodiment of the invention provides a kind of Mobile Multimedia Broadcasting to send, described method comprises:
Transmitting terminal receives one or more multimedia broadcast business data of user;
Described business datum is carried out first handle the generation Frame, described first processing comprises first chnnel coding and first Channel Modulation;
Receive user's control information;
Described control information is carried out second handle the generation control frame, described second processing comprises second channel coding and second channel modulation;
Use slot synchronization channel and at least one described Frame to form time slot, each road multimedia broadcast business data is used an integer described time slot;
Use at least one described time slot to form Traffic Channel;
Use at least one described control frame to form control channel, described control channel comprises and at least one relevant information of business configuration, channel demodulation and channel-decoding;
Use a second frame synchronizing channel, described control channel and described Traffic Channel to rearrange a second frame successively continuously, described second frame synchronizing channel be used for described second frame synchronously, with described second frame was that base unit distributes whole channel, and the length of described second frame accurately was 1 second;
Described second frame carried out launching behind baseband postprocessing and the quadrature up-conversion.
On the other hand, the method that the embodiment of the invention also provides a kind of Mobile Multimedia Broadcasting to receive, described method comprises:
Receiving terminal receives a second frame synchronizing channel, obtains synchronous second frame;
Isolated Traffic Channel and control channel from described second the frame, described control channel comprises and at least one relevant information of business configuration, channel demodulation and channel-decoding;
Further isolate at least one time slot from described Traffic Channel;
Further isolate at least one control frame from described control channel;
Further isolate at least one Frame from described time slot;
Described Frame is carried out the 3rd processing, and described the 3rd processing comprises the 3rd channel demodulation and the 3rd channel-decoding;
Described control frame is carried out the reason everywhere, described the everywhere reason comprise the 4th channel demodulation and the 4th channel-decoding;
Described Frame is finished the described the 3rd obtain one or more multimedia broadcast business data after handling, each road multimedia broadcast business data is used integer described time slot.
On the other hand, the device that the embodiment of the invention also provides a kind of Mobile Multimedia Broadcasting to send, described device comprises:
First receiver module is used to receive one or more multimedia broadcast business data of user;
First processing module is used for business datum that described first receiver module is received, carries out first and handles and generate Frame, and described first handles and comprise first chnnel coding and first Channel Modulation;
Second receiver module is used to receive user's control information;
Second processing module is used for control information that described second receiver module is received, carries out second and handles and generate control frame, and described second handles and comprise that second channel coding and second channel modulate;
Time slot is formed module, and the Frame that is used to use slot synchronization channel and at least one described first processing module to generate is formed time slot, and each road multimedia broadcast business data is used an integer described time slot;
Traffic Channel is formed module, is used to use described time slot to form the time slot that module is formed, and forms Traffic Channel;
Control channel is formed module, is used to use the control frame of at least one described second processing module generation, forms control channel, and described control channel comprises and at least one relevant information of business configuration, channel demodulation and channel-decoding;
Second, frame was formed module, the control channel and the described Traffic Channel that are used to use a second frame synchronizing channel, described control channel to form the module composition are formed the Traffic Channel that module is formed, rearrange a second frame successively continuously, described second frame synchronizing channel be used for described second frame synchronously, with described second frame was that base unit distributes whole channel, and the length of described second frame accurately was 1 second;
Transmitter module is used for described second frame formed the second frame that module is formed, and carries out launching behind baseband postprocessing and the quadrature up-conversion.
On the other hand, the device that the embodiment of the invention also provides a kind of Mobile Multimedia Broadcasting to receive, described device comprises:
Receiver module is used for receiving a second frame synchronizing channel, obtains synchronous second frame;
Separation module is used for isolating Traffic Channel and control channel from the second frame of described receiver module acquisition, and described control channel comprises and at least one relevant information of business configuration, channel demodulation and channel-decoding;
The time slot separation module is used for further isolating at least one time slot from the isolated Traffic Channel of described separation module;
The control frame separation module is used for further isolating at least one control frame from the isolated control channel of described time slot separation module;
The Frame separation module is used for further isolating at least one Frame from the isolated time slot of described time slot separation module;
First processing module is used for the isolated Frame of described Frame separation module is carried out the 3rd processing, and described the 3rd processing comprises the 3rd channel demodulation and the 3rd channel-decoding;
Second processing module is used for the isolated control frame of described control frame separation module, carries out the reason everywhere, described the everywhere reason comprise the 4th channel demodulation and the 4th channel-decoding;
The 3rd processing module, be used for described first processing module to described Frame finish the described the 3rd handle after, obtain one or more multimedia broadcast business data, each road multimedia broadcast business data is used integer described time slot.
The beneficial effect of the technical scheme that the embodiment of the invention provides is:
The method and apparatus that the embodiment of the invention provides can send the multimedia programming that comprises high-quality digital audio broadcasting, digital video broadcasting in specific band width in physical (preferably using 2MHz frequency band and 8MHz frequency band); Can send 1 the road or the broadcasting of multichannel business, support multiple frequency network, MFN and two kinds of networking models of single frequency network, support fixing, the walking and the vehicle-mounted mobile reception of indoor/outdoor; Can select different sending mode and parameter with network environment according to the characteristic of applied business, and support multiple services mixed mode, reach the coupling of traffic performance and sending mode, realize the flexibility and the economy of service operation; And form Traffic Channel by time slot, send one or more multimedia broadcast business data, when in the time slot not in business, can close the equipment that sends this service needed, make this method need not take the great amount of data transmission bandwidth, enough information throughput and can save power can be provided.
Description of drawings
Fig. 1 is the second frame assumption diagram of the embodiment of the invention;
Fig. 2 is the method flow diagram that the Mobile Multimedia Broadcasting that provides of the embodiment of the invention 1 sends;
Fig. 3 is the method flow diagram that the Mobile Multimedia Broadcasting that provides of the embodiment of the invention 2 receives;
Fig. 4 is the method flow diagram that the Mobile Multimedia Broadcasting that provides of the embodiment of the invention 3 sends;
Fig. 5 is the Frame first processing procedure figure that the embodiment of the invention 1 is used;
Fig. 6 is the control frame second processing procedure figure that the embodiment of the invention 1 is used;
Fig. 7 is Frame the 3rd processing procedure figure that the embodiment of the invention 2 is used;
Fig. 8 is that the control frame that uses of the embodiment of the invention 2 the is managed procedure chart everywhere;
Fig. 9 is 2MHz system signal frame structure 1 figure;
Figure 10 is 2MHz system signal frame structure 2 figure;
Figure 11 is the PN192 structure chart that 2MHz system synchronization signal uses;
Figure 12 is the structure drawing of device that the Mobile Multimedia Broadcasting that provides of the embodiment of the invention 4 sends;
Figure 13 is the structure drawing of device that the Mobile Multimedia Broadcasting that provides of the embodiment of the invention 5 receives.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
The embodiment of the invention with second frame be that unit divides whole channel, the frame period each second is 1 second, with Absolute Time Synchronization.As shown in Figure 1, each second frame comprise a second frame synchronizing channel, control channel and Traffic Channel, second frame synchronizing channel be used for second frame synchronously; Control channel is made up of an a series of C control frame, its major function is that carrying is used for the necessary control information of business configuration, channel demodulation and decoding, Traffic Channel is made up of an a series of S time slot, use an integer time slot during each professional transmission, each time slot is made up of a time slot training sequence and F Frame.Above-mentioned C, S and F get different values respectively according to the difference of the transmission mode that adopts, and when adopting transmission mode 1, C gets 5, S gets 20, F gets 44; When adopting transmission mode 2, C gets 10, S gets 18, F gets 88.
In the embodiment of the invention, Frame and control frame adopt identical signal frame structure, and signal frame is the elementary cell of system frame structure, and the signal frame in each second frame adopts identical frame structure.Each signal frame is made up of frame head and frame two parts of signals, and frame head can be used as training sequence simultaneously and carries out channel synchronization and channel estimating as the protection interval of frame.For the 2MHz system, frame head length immobilizes, and is defined as 192 symbols, generally is made of known pseudo random sequence (PN sequence), adopts BPSK (Binary Phase Shift Keying, biphase phase shift keying) modulation.
The embodiment of the invention provides a kind of Mobile Multimedia Broadcasting to send and the method that receives, and specifically comprise: transmitting terminal receives one or more multimedia broadcast business data of user; Business datum is carried out first handle the generation Frame, first processing comprises first chnnel coding and first Channel Modulation; Receive user's control information; Control information is carried out second handle the generation control frame, second processing comprises second channel coding and second channel modulation; Use slot synchronization channel and Frame to form time slot; Use time slot to form Traffic Channel; Use control frame to form control channel; Use a second frame synchronizing channel, Traffic Channel and control channel to form a second frame; To second frame carry out launching behind baseband postprocessing and the quadrature up-conversion; Receiving terminal receives a second frame synchronizing channel, obtains synchronous second frame; Isolate Traffic Channel and control channel the frame from second; Further isolate time slot from Traffic Channel; Further isolate control frame from control channel; Further isolate Frame from time slot; Frame is carried out the 3rd processing, and the 3rd processing comprises the 3rd channel demodulation and the 3rd channel-decoding; Control frame is carried out the reason everywhere, the everywhere reason comprise the 4th channel demodulation and the 4th channel-decoding; Frame is finished the 3rd obtain one or more multimedia broadcast business data after handling.
Embodiment 1
The method that the embodiment of the invention provides a kind of Mobile Multimedia Broadcasting to send, this method is formed a second frame by using a second frame synchronizing channel, Traffic Channel and control channel, sends one or more multimedia broadcast business data.
In the embodiment of the invention, band width in physical adopts the 2MHz frequency band, when using the 2MHz frequency band, signal (comprising various synchronizing channels and frame head, frame symbol) baseband signalling rate unifications all in second frame are 1.536Msps, and the efficient channel width that promptly occupies is 1.536MHz.Frame contains 1536000 symbols altogether each second like this, frame adopts TDS-OFDM (Time Domain Synchronous Orthogonal Frequency DivisionMultiolex, time-domain synchronous orthogonal subdivision is frequently used) multi-carrier modulation technology, adopt transmission mode 1 as shown in table 1, the frame cycle of transmission mode 1 is 1 millisecond (1ms), corresponding frame symbolic number M=1536.
| Transmission mode | The frame cycle | The control frame number C of frames per second | The timeslot number S of frames per second | The data frame number F of every time slot | Second frame synchronizing channel length (symbol) | Slot synchronization channel length (symbol) |
| Transmission mode 1 | 1ms | 5 | 20 | 44 | 15×192 | 192 |
Table 1
Referring to Fig. 2, the method that the embodiment of the invention provides a kind of Mobile Multimedia Broadcasting to send specifically comprises:
201: transmitting terminal receives one or more multimedia broadcast business data of user.
202: business datum is carried out first handle the generation Frame.
The business datum of going the same way is used identical channel coding method and channel modulation mode, different business data flexible configuration is different according to actual needs channel coding method and channel modulation mode, and independently carry out time domain and interweave.
First processing procedure as shown in Figure 5, first processing comprises first chnnel coding and first Channel Modulation, its first chnnel coding adopts 0.4 code check, 0.6 code check or 0.8 code check LDPC (Low Density Parity Check, low-density checksum) coding, first Channel Modulation adopts based on n-QAM (Quadrature AmplitudeModulation simultaneously, quadrature amplitude modulation) Ying She multi-carrier modulation, wherein n can get 4,16,32 or 64, and n-QAM is 4QAM, 16QAM, 32QAM or 64QAM.
First processing procedure is specific as follows:
At first randomization module uses scrambler to carry out scrambling to the business datum of input, obtains the bit stream after the scrambling, and the scrambler of use is the binary pseudo-random sequence of a maximum length, is generated by linear feedback shift register; In order further to reduce threshold level, the bit stream after the scrambling then carries out Reed Solomon Coding (RS coding), obtains the bit stream behind the Reed Solomon Coding; Bit stream behind the Reed Solomon Coding then carries out byte-interleaved, obtain the bit stream after the byte-interleaved, byte-interleaved can reduce the continuous error code influence that the ISN error correction produces outside RS sign indicating number, it is to be the block interleaving of unit with byte (8 bits), every byte data writes by row, read by row, in order to adapt to different constellation mapping and LDPC coding, the byte-interleaved width can be selected flexibly, general select suitable byte-interleaved width, can make the RS coded data of each business in a second frame just in time take the storage size that the integral words joint interweaves; Bit stream after the byte-interleaved then carries out the LDPC coding, obtains the LDPC bit stream coded, and the LDPC coding can adopt 0.4 code check, 0.6 code check or 0.8 code check; In order to adapt to mobile multi-media service, the LDPC bit stream coded is then carried out time domain and is interweaved, bit stream after obtaining time domain and interweaving, the Frame of different business data independently carries out time domain and interweaves, the time domain interleaver is to be the block interleaving of unit with the constellation symbol, write by row, read by row, the interleave depth of block interleaving and weaving width, can select flexibly according to different constellation mapping and LDPC coding, suitable interleave depth and the weaving width of general selection, can make that the symbolic number that each business was transmitted in the frame in second is the storage size of an integer symbol interleaving, time domain interweave with second frame be that unit carries out, each second first data symbol the 1st row and the 1st of writing the symbol interleaving memory block of frame be listed as; Bit stream after time domain interweaves then carries out n-QAM mapping, changes into the n-QAM symbols streams, wherein n can get 4, i6,32 or 64, n-QAM is 4QAM, 16QAM, 32QAM or 64QAM; What the embodiment of the invention adopted is transmission mode 1, the Frame frame is that data length is 1536 n-QAM modulation symbol, after mapping, then use the TDS-OFDM multi-carrier modulation technology, these 1536 n-QAM modulation symbols are carried out frequency-domain-interleaving and the FFT conversion obtains 1536 frame symbols; It further is 192 the synthetic Frame of frame head symbols with above-mentioned frame symbol and length, as shown in Figure 8, its framing structure is: before the frame head symbol is arranged in the frame symbol continuously, frame head symbol and other synchronizing signals are (as frame control channel second, slot synchronization channel etc.), all can adopt pseudo random sequence to form by cyclic extensions, the frame head symbol that uses in the embodiment of the invention and other synchronizing signals are (as frame control channel second, slot synchronization channel etc.), be that 127 PN training sequence is formed by certain all by one 7 rank length, the user in actual applications, can select for use different known arrays to replace these synchronizing signals as required, it is 127 m sequence that the PN training sequence that uses in the embodiment of the invention is defined as one 7 rank length, can realize by a Fibonacci molded lines feedback shift register, reaching " 1 " through " 0 " to+1 value is the binary character of non-return-to-zero to the mapping transformation of-1 value, the frame head symbol is made of a PN192, as shown in figure 10, this PN192 fills 65 symbols as preamble before the PN127 sequence, these 65 Cyclic Prefix that symbol is PN127, the average power of frame head symbol are 2 times of average power of frame symbol.
Generate 44 Frames according to the method described above continuously.
203: receive user's control information.
204: control information is carried out second handle the generation control frame.
Second processing procedure as shown in Figure 6, second processing comprises second channel coding and second channel modulation, the fixing LDPC coding that adopts 0.4 code check of second channel coding, the TDS-OFDM multi-carrier modulation based on the BPSK mapping is adopted in the second channel modulation, and control frame interweaves without time domain simultaneously.Adopt the LDPC coding of 0.4 code check and based on the multicarrier TDS-OFDM modulation that BPSK shines upon, can effectively prevent transmission error code, adopting no time-interleaved main purpose then is that the assurance control information is transmitted safely and fast.
Second processing procedure is specific as follows:
At first randomization module uses scrambler to carry out scrambling to the control information of input, obtains the bit stream after the scrambling, and the scrambler of use is the binary pseudo-random sequence of a maximum length, is generated by linear feedback shift register; Bit stream after the scrambling then carries out the LDPC coding, obtains the LDPC bit stream coded, when carrying out the LDPC coding, and the fixing LDPC coding that uses 0.4 code check; The LDPC bit stream coded is then carried out the BPSK mapping, converts the BPSK symbols streams to; Because what the embodiment of the invention was used is transmission mode 1, so the control frame frame is a data length is 1536 BPSK symbol, after mapping, then use the TDS-OFDM multi-carrier modulation technology, these 1536 BPSK symbols are carried out frequency-domain-interleaving and the FFT conversion obtains 1536 frame symbols; Further be 192 the synthetic control frame of frame head symbols with above-mentioned frame symbol and length, as shown in Figure 9, its framing structure is: before the frame head symbol is arranged in the frame symbol continuously.
Generate 5 control frames according to the method described above continuously.
In addition, the second channel modulation can also be adopted the TDS-OFDM multi-carrier modulation based on the 4QAM mapping, and concrete modulated process repeats no more with the multicarrier TDS-OFDM modulation based on the BPSK mapping herein.
205: use the Frame that generates in the slot synchronization channel and above-mentioned 202 to form time slot.
Time slot is the elementary cell of distribution service.Each time slot is made up of slot synchronization channel and F Frame two parts of signals.Each time slot can carry 67584 symbols, the data symbol after wherein preceding 67392 symbols carry mapping, and back 192 symbols keep.For the 2MHz system, adopt that transmission mode 1, each time slot comprise data frame number F=44, so each time slot need use 44 Frames that generate in above-mentioned 202; With length is before the slot synchronization channel of 192 symbols is arranged in above-mentioned 44 Frames continuously, to be combined into time slot.As shown in figure 11, the slot synchronization channel of use is identical with the frame head symbol, is made of a PN192.
Generate 20 time slots according to the method described above continuously.
206: use the time slot that generates in above-mentioned 205 to form Traffic Channel.
In transmission mode 1, the timeslot number S=20 that the Traffic Channel in second frame comprises is 20 time slots composition Traffic Channels that generate in above-mentioned 205.
207: use the control frame that generates in above-mentioned 204 to form control channel.
In transmission mode 1, the control channel in second frame comprise control frame number C=5,5 control frames composition control channels that generate in above-mentioned 204.
208: use the control channel that generates in the Traffic Channel and above-mentioned 207 that generates in second frame synchronizing channel, above-mentioned 206 to form a second frame.
Second, the structure of frame was: second frame synchronizing channel, control channel and Traffic Channel are arranged successively continuously.In transmission mode 1, the frame control channel was made of 15 continuous PN192 in employed second.
209: a second frame that generates in above-mentioned 208 is carried out launching behind baseband postprocessing and the quadrature up-conversion.
Use shaping filter that the second frame that generates is carried out baseband postprocessing and generate baseband signal, wherein shaping filter adopts square root raised cosine (SRRC, Square Root Raised Cosine) filter to carry out, and the rolloff-factor α of this SRRC filter is 0.05; Baseband signal forms radiofrequency signal (in the 48.5MHz-3000MHz band limits) through frequency conversion.
Method shown in the embodiment of the invention can send the multimedia programming that comprises high-quality digital audio broadcasting, digital video broadcasting in specific band width in physical (preferably using 2MHz frequency band and 8MHz frequency band); Can send 1 the road or the broadcasting of multichannel business, support multiple frequency network, MFN and two kinds of networking models of single frequency network, support fixing, the walking and the vehicle-mounted mobile reception of indoor/outdoor; Can select different sending mode and parameter with network environment according to the characteristic of applied business, and support multiple services mixed mode, reach the coupling of traffic performance and sending mode, realize the flexibility and the economy of service operation; And form Traffic Channel by time slot, send one or more multimedia broadcast business data, when in the time slot not in business, can close the equipment that sends this service needed, make this method need not take the great amount of data transmission bandwidth, enough information throughput and can save power can be provided.
Embodiment 2
The method that the embodiment of the invention also provides a kind of Mobile Multimedia Broadcasting to receive, this method obtain synchronous second frame by receiving a second frame synchronizing channel, obtain one or more multimedia broadcast business data after treatment.
Referring to Fig. 3, the method that the embodiment of the invention provides a kind of Mobile Multimedia Broadcasting to receive specifically comprises:
301: receiving terminal receives a second frame synchronizing channel, obtains synchronous second frame.
302: isolate Traffic Channel and control channel according to the second frame that obtains, wherein Traffic Channel comprises a time slot at least, and control channel comprises and at least one relevant information of business configuration, channel demodulation and channel-decoding.
303: further isolate at least one time slot from isolated Traffic Channel.
304: further isolate at least one control frame from isolated control channel.
305: further isolate at least one Frame from isolated time slot.
306: isolated Frame is carried out the 3rd processing, and the 3rd processing comprises the 3rd channel demodulation and the 3rd channel-decoding.
307: isolated control frame is carried out the reason everywhere, this everywhere reason comprise the 4th channel demodulation and the 4th channel-decoding.Control frame is through the controlled information in reason back everywhere, comprise in the control information with business configuration, channel demodulation and channel-decoding at least one relevant information.Utilize the service configuration information in the control information, can control time slot and receive, receive required time slot selectively; Utilize channel demodulation and channel-decoding information in the control information, can the control data frame the 3rd handle indicates the 3rd to handle and carry out the 3rd correct channel demodulation and the 3rd channel-decoding.
308: Frame finished obtaining one or more multimedia broadcast business data after channel the 3rd is handled.
Method shown in the embodiment of the invention can receive the multimedia programming that comprises high-quality digital audio broadcasting, digital video broadcasting in specific band width in physical (preferably using 2MHz frequency band and 8MHz frequency band); Can receive 1 the road or the broadcasting of multichannel business, support multiple frequency network, MFN and two kinds of networking models of single frequency network, support fixing, the walking and the vehicle-mounted mobile reception of indoor/outdoor; Can select different receiving mode and parameter with network environment according to the characteristic of applied business, and support multiple services mixed mode, reach the coupling of traffic performance and receiving mode, realize the flexibility and the economy of service operation; And by receiving the Traffic Channel of forming by time slot, receive one or more multimedia broadcast business data, when in the time slot not in business, can close the equipment that receives this service needed, make this method need not take the great amount of data transmission bandwidth, enough information throughput and can save power can be provided.
Embodiment 3
In addition, the method that the embodiment of the invention also provides a kind of Mobile Multimedia Broadcasting to send, be with the difference of the method shown in the embodiment 1, in the embodiment of the invention, frame adopts the single-carrier modulated technology, adopt transmission mode 2 as shown in table 2, the frame cycle of transmission mode 2 is 500 microseconds (500us), corresponding frame symbolic number M=768.
| Transmission mode | The frame cycle | The control frame number C of frames per second | The timeslot number S of frames per second | The data frame number F of every time slot | Second frame synchronizing channel length (symbol) | Slot synchronization channel length (symbol) |
| Transmission mode 2 | 500us | 10 | 18 | 88 | 12×192 | 192 |
Table 2
Referring to Fig. 4, the method that the embodiment of the invention also provides a kind of Mobile Multimedia Broadcasting to send specifically comprises:
401: transmitting terminal receives one or more multimedia broadcast business data of user.
402: business datum is carried out first handle the generation Frame.
As shown in figure 10, the Frame frame is that data length is 768 n-QAM modulation symbol.
First processing procedure adopts single-carrier modulated as shown in Figure 7, with 768 n-QAM modulation symbols directly as the frame symbol; Rather than in embodiment 1 step 202,1536 n-QAM modulation symbols are carried out frequency-domain-interleaving and the FFT conversion obtains the frame symbol again, others repeat no more with step 202 among the embodiment 1 herein.
Generate 88 Frames according to the method described above continuously.
403: receive user's control information.
404: control information is carried out second handle the generation control frame.
As shown in figure 10, the control frame frame is that data length is 768 BPSK symbol;
Second processing procedure as shown in Figure 8, adopt the single-carrier modulated technology, with 768 BPSK symbols directly as the frame symbol, rather than in embodiment 1 step 204,1536 BPSK symbols are carried out frequency-domain-interleaving and the FFT conversion obtains 1536 frame symbols, others repeat no more with step 204 among the embodiment 1 herein.
Generate 10 control frames according to the method described above continuously.
405: use 88 Frames that generate in the slot synchronization channel and above-mentioned 402 to form time slot.
The detailed process of forming time slot repeats no more with embodiment 1 step 402 herein.
Generate 18 time slots according to the method described above continuously.
406: use 18 time slots that generate in above-mentioned 405 to form Traffic Channel.
407: use 10 control frames that generate in above-mentioned 404 to form control channel.
408: use the control channel that generates in the Traffic Channel and above-mentioned 407 that generates in second frame synchronizing channel, above-mentioned 406 to form a second frame.
409: a second frame that generates in above-mentioned 408 is carried out launching behind baseband postprocessing and the quadrature up-conversion.
Method shown in the embodiment of the invention can send the multimedia programming that comprises high-quality digital audio broadcasting, digital video broadcasting in specific band width in physical (preferably using 2MHz frequency band and 8MHz frequency band); Can send 1 the road or the broadcasting of multichannel business, support multiple frequency network, MFN and two kinds of networking models of single frequency network, support fixing, the walking and the vehicle-mounted mobile reception of indoor/outdoor; Can select different sending mode and parameter with network environment according to the characteristic of applied business, and support multiple services mixed mode, reach the coupling of traffic performance and sending mode, realize the flexibility and the economy of service operation; And form Traffic Channel by time slot, send one or more multimedia broadcast business data, when in the time slot not in business, can close the equipment that sends this service needed, make this method need not take the great amount of data transmission bandwidth, enough information throughput and can save power can be provided.In addition, the embodiment of the invention, first handle in 768 n-QAM modulation symbols directly as the frame symbol, in second processing procedure with 768 BPSK symbols directly as the frame symbol, make processing procedure simpler.
Embodiment 4
In addition, referring to Figure 12, the device that the embodiment of the invention also provides a kind of Mobile Multimedia Broadcasting to send specifically comprises:
Time slot is formed module 125, is used to use the Frame of slot synchronization channel and at least one first processing module, 122 generation, forms time slot, and each road multimedia broadcast business data is used integer time slot;
Traffic Channel is formed module 126, is used to use at least one time slot to form the time slot that module 125 is formed, and forms Traffic Channel;
Control channel is formed module 127, is used to use the control frame of at least one second processing module, 124 generation, forms control channel, and control channel comprises and at least one relevant information of business configuration, channel demodulation and channel-decoding;
Second, frame was formed module 128, the control channel and the Traffic Channel that are used to use a second frame synchronizing channel, control channel to form module 127 compositions are formed the Traffic Channel that module 126 is formed, rearrange a second frame successively continuously, second, frame synchronizing channel was used for the synchronous of second frame, with second frame be that base unit distributes whole channel, the length of second frame accurately was 1 second;
Device shown in the embodiment of the invention can send the multimedia programming that comprises high-quality digital audio broadcasting, digital video broadcasting in specific band width in physical (preferably using 2MHz frequency band and 8MHz frequency band); Can send 1 the road or the broadcasting of multichannel business, support multiple frequency network, MFN and two kinds of networking models of single frequency network, support fixing, the walking and the vehicle-mounted mobile reception of indoor/outdoor; Can select different sending mode and parameter with network environment according to the characteristic of applied business, and support multiple services mixed mode, reach the coupling of traffic performance and sending mode, realize the flexibility and the economy of service operation; And form Traffic Channel by time slot, send one or more multimedia broadcast business data, when in the time slot not in business, can close the equipment that sends this service needed, make this method need not take the great amount of data transmission bandwidth, enough information throughput and can save power can be provided.
Embodiment 5
In addition, referring to Figure 13, the device that the embodiment of the invention also provides a kind of Mobile Multimedia Broadcasting to receive specifically comprises:
Time slot separation module 133 is used for further isolating at least one time slot from separation module 132 isolated Traffic Channels;
Control frame separation module 134 is used for further isolating at least one control frame from separation module 132 isolated control channels;
The 3rd processing module 138, be used for 136 pairs of Frames of first processing module finish the 3rd handle after, obtain described one or more multimedia broadcast business data.
Device shown in the embodiment of the invention can receive the multimedia programming that comprises high-quality digital audio broadcasting, digital video broadcasting in specific band width in physical (preferably using 2MHz frequency band and 8MHz frequency band); Can receive 1 the road or the broadcasting of multichannel business, support multiple frequency network, MFN and two kinds of networking models of single frequency network, support fixing, the walking and the vehicle-mounted mobile reception of indoor/outdoor; Can select different receiving mode and parameter with network environment according to the characteristic of applied business, and support multiple services mixed mode, reach the coupling of traffic performance and receiving mode, realize the flexibility and the economy of service operation; And Traffic Channel by the receiving slot composition, receive one or more multimedia broadcast business data, when in the time slot not in business, can close the equipment that receives this service needed, make this method need not take the great amount of data transmission bandwidth, enough information throughput and can save power can be provided.
All or part of content in the technical scheme that above embodiment provides can realize that its software program is stored in the storage medium that can read by software programming, storage medium for example: the hard disk in the computer, CD or floppy disk.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the method that sends of a Mobile Multimedia Broadcasting is characterized in that described method comprises:
Transmitting terminal receives one or more multimedia broadcast business data of user;
Described business datum is carried out first handle the generation Frame, described first processing comprises first chnnel coding and first Channel Modulation;
Receive user's control information;
Described control information is carried out second handle the generation control frame, described second processing comprises second channel coding and second channel modulation;
Use slot synchronization channel and at least one described Frame to form time slot, each road multimedia broadcast business data is used an integer described time slot;
Use at least one described time slot to form Traffic Channel;
Use at least one described control frame to form control channel, described control channel comprises and at least one relevant information of business configuration, channel demodulation and channel-decoding;
Use a second frame synchronizing channel, described control channel and described Traffic Channel to rearrange a second frame successively continuously, described second frame synchronizing channel be used for described second frame synchronously, with described second frame was that base unit distributes whole channel, and the length of described second frame accurately was 1 second;
Described second frame carried out launching behind baseband postprocessing and the quadrature up-conversion.
2. the method that Mobile Multimedia Broadcasting according to claim 1 sends is characterized in that the detailed process of described first chnnel coding is:
Adopt the LDPC coding of 0.4 code check, 0.6 code check or 0.8 code check that the business datum of input is encoded, obtain described LDPC bit stream coded;
The detailed process of described first Channel Modulation is:
Described LDPC bit stream coded is carried out the n-QAM mapping, obtain the n-QAM modulation symbol, wherein n can get 4,16,32 or 64;
Use single-carrier modulated technology or multi-carrier modulation technology carry out frequency-domain-interleaving with described n-QAM modulation symbol and the FFT conversion obtains the frame symbol;
With described frame symbol and the synthetic described Frame of frame head symbols.
3. the method that Mobile Multimedia Broadcasting according to claim 1 sends is characterized in that, the detailed process of described second channel coding is:
Adopt the LDPC coding of 0.4 code check that the control information of input is encoded, obtain described LDPC bit stream coded;
The detailed process of described second channel modulation is:
Described LDPC bit stream coded is carried out BPSK mapping or 4QAM mapping, obtain BPSK modulation symbol or 4QAM modulation symbol;
Use single-carrier modulated technology or multi-carrier modulation technology, with described BPSK modulation symbol or the 4QAM modulation symbol carries out frequency-domain-interleaving and the FFT conversion obtains the frame symbol;
With described frame symbol and the synthetic described control frame of frame head symbols.
4. the method that Mobile Multimedia Broadcasting according to claim 1 and 2 sends is characterized in that,
Described first handles carrying out and also comprises before described first chnnel coding:
Use scrambler to carry out scrambling to the business datum of input, obtain the bit stream after the scrambling;
Bit stream after the described scrambling then carries out Reed Solomon Coding, obtains the bit stream behind the described Reed Solomon Coding;
Bit stream behind the described Reed Solomon Coding then carries out byte-interleaved, obtains the bit stream after the byte-interleaved.
5. the method that Mobile Multimedia Broadcasting according to claim 1 and 2 sends is characterized in that, described first handles after carrying out described first chnnel coding, carries out also comprising before described first Channel Modulation:
Described LDPC bit stream coded is carried out time domain interweave, the bit stream after obtaining time domain and interweaving.
6. the method that Mobile Multimedia Broadcasting according to claim 1 and 2 sends is characterized in that, described second handles carrying out and also comprise before the described second channel coding:
Use scrambler to carry out scrambling to the control information of input, obtain the bit stream after the scrambling.
7. the method that Mobile Multimedia Broadcasting according to claim 1 sends is characterized in that, and is described
Frame adopts identical signal frame structure with described control frame, is made up of frame head and frame two parts.
8. the method that sends according to claim 1 or 2 or 3 described Mobile Multimedia Broadcasting, it is characterized in that, described slot synchronization channel, described second frame synchronizing channel and described frame head symbol all adopt pseudo random sequence to form by cyclic extensions, and the average power of described pseudo random sequence is 2 times of average power of described frame symbol.
9. the method that receives of a Mobile Multimedia Broadcasting is characterized in that described method comprises:
Receiving terminal receives a second frame synchronizing channel, obtains synchronous second frame;
Isolated Traffic Channel and control channel from described second the frame, described control channel comprises and at least one relevant information of business configuration, channel demodulation and channel-decoding;
Further isolate at least one time slot from described Traffic Channel;
Further isolate at least one control frame from described control channel;
Further isolate at least one Frame from described time slot;
Described Frame is carried out the 3rd processing, and described the 3rd processing comprises the 3rd channel demodulation and the 3rd channel-decoding;
Described control frame is carried out the reason everywhere, described the everywhere reason comprise the 4th channel demodulation and the 4th channel-decoding;
Described Frame is finished the described the 3rd obtain one or more multimedia broadcast business data after handling, each road multimedia broadcast business data is used integer described time slot.
10. the device that sends of a Mobile Multimedia Broadcasting is characterized in that described device comprises:
First receiver module is used to receive one or more multimedia broadcast business data of user;
First processing module is used for business datum that described first receiver module is received, carries out first and handles and generate Frame, and described first handles and comprise first chnnel coding and first Channel Modulation;
Second receiver module is used to receive user's control information;
Second processing module is used for control information that described second receiver module is received, carries out second and handles and generate control frame, and described second handles and comprise that second channel coding and second channel modulate;
Time slot is formed module, and the Frame that is used to use slot synchronization channel and at least one described first processing module to generate is formed time slot, and each road multimedia broadcast business data is used an integer described time slot;
Traffic Channel is formed module, is used to use at least one described time slot to form the time slot that module is formed, and forms Traffic Channel;
Control channel is formed module, is used to use the control frame of at least one described second processing module generation, forms control channel, and described control channel comprises and at least one relevant information of business configuration, channel demodulation and channel-decoding;
Second, frame was formed module, be used to use the control channel of a second frame synchronizing channel, described control channel composition module composition and the Traffic Channel of described Traffic Channel composition module composition to rearrange a second frame successively continuously, described second frame synchronizing channel be used for described second frame synchronously, with described second frame was that base unit distributes whole channel, and the length of described second frame accurately was 1 second;
Transmitter module is used for described second frame formed the second frame that module is formed, and carries out launching behind baseband postprocessing and the quadrature up-conversion.
11. the device that Mobile Multimedia Broadcasting receives is characterized in that described device comprises:
Receiver module is used for receiving a second frame synchronizing channel, obtains synchronous second frame;
Separation module is used for isolating Traffic Channel and control channel from the second frame of described receiver module acquisition, and described control channel comprises and at least one relevant information of business configuration, channel demodulation and channel-decoding;
The time slot separation module is used for further isolating at least one time slot from the isolated Traffic Channel of described separation module;
The control frame separation module is used for further isolating at least one control frame from the isolated control channel of described time slot separation module;
The Frame separation module is used for further isolating at least one Frame from the isolated time slot of described time slot separation module;
First processing module is used for the isolated Frame of described Frame separation module is carried out the 3rd processing, and described the 3rd processing comprises the 3rd channel demodulation and the 3rd channel-decoding;
Second processing module is used for the isolated control frame of described control frame separation module, carries out the reason everywhere, described the everywhere reason comprise the 4th channel demodulation and the 4th channel-decoding;
The 3rd processing module, be used for described first processing module to described Frame finish the described the 3rd handle after, obtain one or more multimedia broadcast business data, each road multimedia broadcast business data is used integer described time slot.
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