CN103036664B - The multiplexing method of passage in a kind of digital audio broadcasting - Google Patents
The multiplexing method of passage in a kind of digital audio broadcasting Download PDFInfo
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- CN103036664B CN103036664B CN201210537495.2A CN201210537495A CN103036664B CN 103036664 B CN103036664 B CN 103036664B CN 201210537495 A CN201210537495 A CN 201210537495A CN 103036664 B CN103036664 B CN 103036664B
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Abstract
A multiplexing method for passage in digital audio broadcasting, need to be divided into business description information and business datum in the information of digital audio broadcasting channel; Pack described business description information with formation control multiplexed frame with the first multiplexed frame pattern; Pack described business datum to form service integration frame with the second multiplexed frame pattern; In each logical frame, all provide business description information channel and business datum passage, to carry respectively a described control multiplexed frame and one or more service integration frame. Multiplexing method of the present invention has kept flexibility and the high efficiency of service integration, has realized separating completely of control channel and Traffic Channel. Reduce the interference of control channel to Traffic Channel, further realized the parallel receive of control channel and Traffic Channel simultaneously, strengthened the support of system to dynamic channel and dynamic service, reduced the expense of service control, further improved multiplexing efficiency.
Description
Technical field
The present invention relates to communication and digital audio broadcasting field, relate in particular to passage in a kind of digital audio broadcastingMultiplexing method.
Background technology
In the communications field, multiplexing function has been the Information encapsulations such as video and audio, data, electron service instructionAnd arrangement, can on transmission channel, transmit. In digital multimedia broadcasting system in the past, asCMMB China Mobile multimedia broadcasting system has adopted the multiplexing method of time-division slot, this method mainFeature comprises: each broadcast channel transmission frame is divided into 40 time slots, is numbered TS0 to TS39, itsIn, TS0 is as control logic channel, and TS1 ~ TS39 is as service logical channels; When several are continuousGap forms a multiplexed frame, and all time slots of this multiplexed frame all adopt identical physical layer encodes and modulation ginsengNumber, this physical layer parameter is provided by the multiplexing allocation list in TS0; Each multiplexed frame can comprise one orMultiple multiplexed sub frames, each multiplexed sub frame is used for carrying an independent business. This multiplexing method has manyAdvantage, distributes support multiple business service quality and fast business if realize service bandwidth flexiblySwitch, the multiplexing structure based on multiplexed frame and multiplexed sub frame has also brought higher multiplexing efficiency, but also existsFollowing problem:
First, because control logic channel has adopted the modulation and demodulation mode that is different from service logical channels,Therefore, CMMB need to receive step by step in the time of the business of reception, first from control logic channel TS0Demultiplexing, obtains the physical layer parameter of other service logical channels, then receives service logic letter with this parameterData on road. Once the multiplexing control table on control channel changes, will cause again receiving controlling and patrolCollect channel, this receives the business of interrupting on current service logical channels, i.e. the renewal of multiplexing control table willAffect the reception of service logical channels.
Secondly, adopt a time slot to carry out communicating control information table and also brought waste, a common time slot is used forWhen service data transmission, can support the transmission of 140Kbps, but the required band of control information transmission table per secondWide several Kbps of need, this has just caused the waste of bandwidth.
Therefore, wide for the numeral that works in traditional analog frequency modulation broadcasting frequency range (87MHz～108MHz)Broadcast system, need to propose a kind of multiplexing method of new passage, overcomes defect of the prior art.
Summary of the invention
In order one of to solve the problems of the technologies described above, the invention provides answering of passage in a kind of digital audio broadcastingBy method, need to be divided into business description information and business in the information of digital audio broadcasting channelData; Pack described business description information with formation control multiplexed frame with the first multiplexed frame pattern; Multiple with secondPack described business datum to form service integration frame by frame pattern; In each logical frame, all provide business to retouchState information channel and business datum passage, to carry respectively a described control multiplexed frame and one or more industryBusiness multiplexed frame.
Especially, with the first multiplexed frame pattern step of described business description information with formation control multiplexed frame of packingSuddenly comprise: in the multiplexed frame payload of described control multiplexed frame, insert one or more control information tables; AndIn the multiplex frame head of described control multiplexed frame, insert contained control information table number in this multiplexed frame payload of instructionThe field of amount and each control information table length.
Described control information table comprises period service duplexing configuration list and network information table, period service duplexing configuration list and netNetwork information table is for carrying respectively information and the digital sound of the each service integration frame configuration in current frequencyFrequently the attribute information of radio network and adjacent area network thereof.
And described method also comprises the steps: to exceed a logic when the length of described control information tableIn frame, when the active volume of business description information channel, described control information table is carried out to segmentation, and in differenceLogical frame in transmit the control information table after described segmentation.
Described period service duplexing configuration list comprises: table identification number, segment length, section sequence number, hop count amount, business are multipleWith configuration table updating sequence number, multiplexed frame mark, multiplexed frame transmission mode, business datum hierarchical modulation indicate,The service identification of business datum height protection instruction, multiplexed sub frame quantity and each multiplexed sub frame.
The step of described segmentation also comprises: in each segmentation, all comprise table identification number, segment length, section sequence number,Hop count amount, period service duplexing configuration list upgrade the information of sequence number; A multiplexed frame identifies corresponding multiplexed frame transmissionThe instruction of pattern, business datum hierarchical modulation, business datum height protection instruction, multiplexed sub frame quantity and eachThe service identification of multiplexed sub frame is retained in a segmentation; And different multiplexed frames identify corresponding multiplexed frame biographyDefeated pattern, the instruction of business datum hierarchical modulation, business datum height protection instruction, multiplexed sub frame quantity and eachThe service identification of individual multiplexed sub frame can be distributed in different segmentations.
Described network information table comprises: table identification number, segment length, section sequence number, hop count amount and network information tableUpgrade centre frequency, the network title of sequence number, national code, network number, network frequency quantity and each frequencyCharacter, adjacent area the number networks, adjacent area network number, adjacent area network frequency quantity and the neighbour of length and each titleNetwork center of district frequency.
The step of described segmentation also comprises: in each segmentation, all comprise table identification number, segment length, section sequence number,Hop count amount and update sequence number of network information list; National code, network number, network frequency quantity and each frequencyThe character of centre frequency, network title length and each title, adjacent area the number networks are retained in a segmentation;And the adjacent area network number of an adjacent area network, adjacent area network frequency quantity and adjacent area network center frequency retainIn a segmentation, in the adjacent area network number of different adjacent areas network, adjacent area network frequency quantity and adjacent area networkFrequency of heart is retained in different segmentations.
Utilize multiplexing method of the present invention to adapt to the physical layer transmission feature of digital audio broadcast system. This bothKeep flexibility and the high efficiency of service integration, realized again control channel (business description information channel)With separating completely of Traffic Channel (business datum passage). Thereby make terminal not need control channel to enterRow demultiplexing can normally receive Traffic Channel, has reduced the interference of control channel to Traffic Channel, enters simultaneouslyOne step realizes the parallel receive of control channel and Traffic Channel, has strengthened system to dynamic channel and dynamic serviceSupport, reduced the expense of service control, further improved multiplexing efficiency.
Brief description of the drawings
The present invention above-mentioned and/or additional aspect and advantage from the following description of the accompanying drawings of embodimentsTo become obviously and easily and understand, wherein:
Fig. 1 shows the schematic diagram of multiplexing part in digital audio broadcasting front end system;
Fig. 2 shows the multiplexed frame structure according to the embodiment of the present invention;
Fig. 3 shows according to the corresponding relation of the multiplexed frame of the embodiment of the present invention and channel superframe and multiplexingFrame structure;
Fig. 4 shows the control multiplexed frame frame head structure according to the embodiment of the present invention;
Fig. 5 shows the control multiplexed frame frame head parameter configuration according to the embodiment of the present invention;
Fig. 6 shows the period service duplexing configuration list definition according to the embodiment of the present invention;
Fig. 7 shows the network information table definition according to the embodiment of the present invention;
Fig. 8 shows the service integration frame structure that adopts not stratified modulation system according to the embodiment of the present invention;
Fig. 9 shows according to the service integration frame structure of the employing hierarchical modulation mode of the embodiment of the present invention;
Figure 10 shows the service integration frame frame head structure according to the embodiment of the present invention;
Figure 11 shows the service integration frame frame head parameter configuration according to the embodiment of the present invention;
Figure 12 shows according to the multiplexed sub frame structure in the service integration frame frame payload of the embodiment of the present invention.
Detailed description of the invention
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, wherein certainlyBeginning to whole same or similar label represents same or similar element or has the unit of identical or similar functionsPart. Exemplary below by the embodiment being described with reference to the drawings, only for explaining the present invention, and can notBe interpreted as limitation of the present invention.
Digital audio broadcast system is to work in traditional analog frequency modulation broadcasting frequency range (87MHz～108MHz)Digit broadcasting system, by digital coding modulation technology DARS and data serviceBroadcast. The channel multiplexing method of digital audio broadcasting of the present invention has adopted orthogonal multiple carrier in physical layerOFDM technology, and be physical layer signaling information, business description information according to subcarrier in frequency domain, business numberAccording to having divided different transmission channels, be respectively system information passage, business description information channel and business numberAccording to passage.
In order one of to solve the problems of the technologies described above, in a kind of digital audio broadcast system of the present invention, provide onePlant the multiplexing method of passage. First, need to be divided into industry in the information of digital audio broadcasting channelBusiness descriptor and business datum, in the front end system of digital audio broadcasting of the present invention, multiplexing objectTo carry out Information encapsulation and the arrangements such as audio frequency, data, electron service instruction, can be on broadcast channelTransmit, see Fig. 1, the audio frequency Basic Flow of same business and data flow are encapsulated in one or many as business datumIn individual multiplexed sub frame; The supplementarys such as urgent broadcast, electron service instruction, user management are also as business numberAccording to but be encapsulated in respectively in different multiplexed sub frames. Control information table and network information table enter as control informationRow encapsulation.
Subsequently, pack described business description information to form a control multiplexed frame with the first multiplexed frame pattern;Pack described business datum to form a service integration frame with the second multiplexed frame pattern; In each logical frameBusiness description information channel and business datum passage are all provided, with carry respectively a described control multiplexed frame andOne or more service integration frames. Described the first multiplexed frame pattern and the second multiplexed frame pattern will be detailed belowDescribe. In channel treatment processes, the multiplexed frame of different identification is sent out with different physical layer logic channelsSend.
Specifically, as shown in Figure 3, the channel of audio broadcasting adopts a channel super frame period mode, oneIndividual superframe is made up of multiple channel logical frame, for example, forms each channel logical frame by 4 channel logical frameFor the multiplexing passage providing has business description information channel and business datum passage. According to business description information exchangeThe structure of road and business datum passage, multiplexed frame is divided into controls two types of multiplexed frame and service integration frames. RespectivelyPlant control information table and be carried in business description information channel to control multiplexed frame payload form, miscellaneous service numberService integration frame payload form is carried in business datum passage according to this. Control information table is believed according to business descriptionThe capacity of breath passage transmits successively and allows passing successively by section after a control information table segmenting on passageSend.
As shown in Figure 2, especially, a multiplexed frame only holds the structure of described multiplexed frame in a logical frameCarry a multiplexed frame---comprise service integration frame and control multiplexed frame by multiplex frame head, multiplexed frame payload andFill composition. Filling part can with complete 1 fill. Wherein, the business description information channel of a logical frameCarry one and control multiplexed frame, the business of business datum passage carrying that in a logical frame, protective rate is identicalMultiplexed frame.
Especially, pack described business description information to form a control multiplexed frame with the first multiplexed frame patternStep comprise:
In the multiplexed frame payload of described control multiplexed frame, insert one or more control information tables. A businessIn the multiplexed frame payload of the control multiplexed frame of descriptor carrying, comprise one or more control information tables. ThisAs shown in Figure 4, in the multiplex frame head of described control multiplexed frame, insert institute in this multiplexed frame payload of instruction outward,Containing the field of control information table quantity and each control information table length. And in described multiplex frame headInsert the length of first control information table and the length of other control information tables in instruction multiplexed frame payload.
In the present embodiment, described control information table comprises period service duplexing configuration list and network information table, forCarry respectively the information of the each service integration frame configuration in current frequency and digital audio broadcasting network andThe attribute information of its adjacent area network. Described control information table identifies with table identification number, shows dividing of identification numberJoin as shown in Figure 5. Especially, when the length of described control information table exceedes business description in a logical frameWhen the active volume of information channel, described control information table is carried out to segmentation, and pass in different logical frameSend the table of the control information after described segmentation.
Described period service duplexing configuration list has been described the information of the each service integration frame configuration in current frequency, exampleAs the multiplexed sub frame number of each service integration frame and service identification corresponding to subframe etc., for example, comprise: table markNumber, segment length, section sequence number, hop count amount, period service duplexing configuration list upgrade sequence number, multiplexed frame mark, multiplexingFrame transmission mode, the instruction of business datum hierarchical modulation, business datum height protection instruction, multiplexed sub frame quantityService identification with each multiplexed sub frame. The example of a period service duplexing configuration list as shown in Figure 6, whereinM1 represents multiplexed frame mark quantity; M2 represents multiplexed sub frame quantity. Wherein:
Multiplexed frame mark quantity: 6 bit fields, represent the quantity of the multiplexed frame mark comprising in current segmentation.
Multiplexed frame mark: 6 bit fields, the MFID of identification service multiplexed frame, since 1 value.
Business datum hierarchical modulation instruction: 1 bit field, 1 represents that business datum is used hierarchical modulation, 0 tableShow and do not use hierarchical modulation.
Business datum height protection instruction: 1 bit field, 1 represents that business datum is used high protection, 0 representsBusiness datum is used low protection.
Multiplexed frame transmission mode: 4 bit fields, the transmission mode of expression service integration frame, each field representative is worked asFront multiplexed frame identifies institute's counterlogic frame and takies situation. Bit from left to right successively corresponding the 1st to the4 logical frame. Bit is that the logical frame of 1 expression correspondence is occupied, be the logical frame of 0 expression correspondence notOccupied.
Multiplexed sub frame quantity: 4 bit fields, represent the multiplexed sub frame quantity that service integration frame comprises.
Service identification: 16 bit fields, represent each multiplexed sub frame the identification number of corresponding business.
Preferably, described is in each segmentation, all to comprise table mark to the step of period service duplexing configuration list segmentationNumber, segment length, section sequence number, hop count amount, period service duplexing configuration list upgrade the information of sequence number; A multiplexed frameIdentify the instruction of corresponding multiplexed frame transmission mode, business datum hierarchical modulation, business datum height protection instruction,The service identification of multiplexed sub frame quantity and each multiplexed sub frame is retained in a segmentation; And different multiplexed framesIdentify the instruction of corresponding multiplexed frame transmission mode, business datum hierarchical modulation, business datum height protection instruction,The service identification of multiplexed sub frame quantity and each multiplexed sub frame can be distributed in different segmentations.
The digital audio broadcasting transfer system of network operator's operation and management is called a network; This network instituteThat knows has other network intersecting to be called adjacent area network with its area of coverage. As shown in Figure 7, the described network informationTable has been described and has been comprised: table identification number, segment length, section sequence number, hop count amount and update sequence number of network information list,The centre frequency of national code, network number, network frequency quantity and each frequency, network title length and eachCharacter, adjacent area the number networks, adjacent area network number, adjacent area network frequency quantity and the adjacent area network center of titleFrequency. Wherein: N1 represents current network frequency quantity; N2 represents current network title length; N3 tableShow adjacent area the number networks; N4 represents corresponding specific adjacent area network frequency quantity.
Described to the step of network information table segmenting in each segmentation, all comprise table identification number, segment length,Section sequence number, hop count amount and update sequence number of network information list; National code, network number, network frequency quantity and eachCharacter, adjacent area the number networks of centre frequency, network title length and each title of individual frequency are retained in oneIn individual segmentation; And in the adjacent area network number of an adjacent area network, adjacent area network frequency quantity and adjacent area networkFrequency of heart is retained in a segmentation, the adjacent area network number of different adjacent areas network, adjacent area network frequency quantity andAdjacent area network center frequency is retained in different segmentations.
In described logical frame, insert one or more service integration frames. As shown in Figure 8, described service integrationFrame payload is made up of one or more multiplexed sub frames, and multiplexed sub frame is for bearer service, and a multiplexed sub frame onlyCan carry the data of a business, in the time that a business is not used hierarchical coding technology, a business correspondence oneIndividual multiplexed sub frame; In the time that a business is used hierarchical coding technology, a business is according to a point progression correspondence 2Individual or more multiplexed sub frames.
Especially, in the time that channel adopts evenly protection and layering transfer mode, in a channel logical frame, send outThe service integration number of frames of sending can comprise the service integration frame of a for example high protection and a low protectionService integration frame, as shown in Figure 9. The structure composition of service integration frame head is shown in Figure 10, and specific definition is as figureShown in 11. Wherein multiplexed sub frame is made up of subframe head, audio section, data segment and filling, its specific definitionAs shown in figure 12.
Utilize channel multiplexing method of the present invention can bring following advantage:
First, multiplexing method of the present invention has adapted to the physical layer transmission feature of digital audio broadcast system. NumberThe physical layer of word audio droadcasting system is business description information channel by subcarrier by channel distribution on frequency domainWith business datum passage, the control multiplexed frame structure that wherein business description information channel adopts can keep industryBe engaged in multiplexing flexibility and high efficiency have been removed unnecessary physical layer ginseng simultaneously in period service duplexing configuration listNumber information.
Secondly, this multiplexing method has been realized control channel (business description information channel) and Traffic Channel (industryBusiness data channel) separation completely. Owing to receiving control channel and the required physical layer encodes of Traffic ChannelPut in physical layer system information channel and transmit with modulation parameter, therefore terminal does not need control channel to enterRow demultiplexing can normally receive Traffic Channel, and this has reduced the interference of control channel to Traffic Channel, enters oneStep realizes the parallel receive of control channel and Traffic Channel, strengthened system to dynamic channel and dynamic serviceSupport.
Again, further improved multiplexing efficiency. Business description information channel is carried out the multiplexing configuration of transport serviceThe bandwidth of table etc. is several Kbps, much smaller than the bandwidth (tens Kbps are to hundreds of Kbps) of business datum passage,Owing to need to not reserving a multiplexed frame as control channel from business data channel, therefore, greatly reduceThe expense of service control.
Finally, multiplexing method of the present invention also provides the support to hierarchical coding audio service; Can be by oneThe data of the difference protection level in individual audio service are put in the business datum passage of different transmission qualitiesTransmission, to improve the overall performance of system.
The above is only the preferred embodiment of the present invention, it should be pointed out that common for the artTechnical staff, under the premise without departing from the principles of the invention, can also make some improvements and modifications,These improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
1. a multiplexing method for passage in digital audio broadcasting, is characterized in that:
Need to be divided into business description information and business datum in the information of digital audio broadcasting channel;
Pack described business description information with formation control multiplexed frame with the first multiplexed frame pattern; Comprise with the step of formation control multiplexed frame with the first multiplexed frame pattern described business description information of packing: in the multiplexed frame payload of described control multiplexed frame, insert one or more control information tables; And in the multiplex frame head of described control multiplexed frame, insert the field of contained control information table quantity and each control information table length in this multiplexed frame payload of instruction; Described control information table comprises period service duplexing configuration list and network information table, for carrying respectively the information of the each service integration frame configuration in current frequency and the attribute information of digital audio broadcasting network and adjacent area network thereof; In the time that the length of described control information table exceedes the active volume of business description information channel in a logical frame, described control information table is carried out to segmentation, and in different logical frame, transmit the control information table after described segmentation; Described period service duplexing configuration list comprises: table identification number, segment length, section sequence number, hop count amount, period service duplexing configuration list upgrade the service identification of sequence number, multiplexed frame mark, multiplexed frame transmission mode, the instruction of business datum hierarchical modulation, business datum height protection instruction, multiplexed sub frame quantity and each multiplexed sub frame;
Pack described business datum to form service integration frame with the second multiplexed frame pattern;
In each logical frame, all provide business description information channel and business datum passage, to carry respectively a described control multiplexed frame and one or more service integration frame.
2. method according to claim 1, is characterized in that: the step of described segmentation also comprises:
In each segmentation, all comprise the information of table identification number, segment length, section sequence number, hop count amount, period service duplexing configuration list renewal sequence number;
The service identification that multiplexed frame identifies corresponding multiplexed frame transmission mode, the instruction of business datum hierarchical modulation, business datum height protection instruction, multiplexed sub frame quantity and each multiplexed sub frame is retained in a segmentation; And
The service identification that different multiplexed frames identify corresponding multiplexed frame transmission mode, the instruction of business datum hierarchical modulation, business datum height protection instruction, multiplexed sub frame quantity and each multiplexed sub frame is distributed in different segmentations.
3. method according to claim 1, is characterized in that: described network information table comprises:
Character, adjacent area the number networks, adjacent area network number, adjacent area network frequency quantity and the adjacent area network center frequency of centre frequency, network title length and each network title of table identification number, segment length, section sequence number, hop count amount and update sequence number of network information list, national code, network number, network frequency quantity and each frequency.
4. method according to claim 3, is characterized in that: the step of described segmentation also comprises:
In each segmentation, all comprise table identification number, segment length, section sequence number, hop count amount and update sequence number of network information list;
Character, adjacent area the number networks of centre frequency, network title length and each network title of national code, network number, network frequency quantity and each frequency is retained in a segmentation; And
Adjacent area network number, adjacent area network frequency quantity and the adjacent area network center frequency of an adjacent area network are retained in a segmentation, and the adjacent area network number of different adjacent areas network, adjacent area network frequency quantity and adjacent area network center frequency are retained in different segmentations.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1976294A (en) * | 2006-12-05 | 2007-06-06 | 中兴通讯股份有限公司 | Method for transmitting mobile multimedia broadcasting electronic service guide |
| CN102694764A (en) * | 2011-08-17 | 2012-09-26 | 国家广播电影电视总局广播科学研究院 | Methods and devices for sending and receiving digital audio signal in digital audio broadcasting system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1976294A (en) * | 2006-12-05 | 2007-06-06 | 中兴通讯股份有限公司 | Method for transmitting mobile multimedia broadcasting electronic service guide |
| CN102694764A (en) * | 2011-08-17 | 2012-09-26 | 国家广播电影电视总局广播科学研究院 | Methods and devices for sending and receiving digital audio signal in digital audio broadcasting system |
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