CN103036664A - Multiplex method of channel in digital audio broadcasting - Google Patents
Multiplex method of channel in digital audio broadcasting Download PDFInfo
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- CN103036664A CN103036664A CN 201210537495 CN201210537495A CN103036664A CN 103036664 A CN103036664 A CN 103036664A CN 201210537495 CN201210537495 CN 201210537495 CN 201210537495 A CN201210537495 A CN 201210537495A CN 103036664 A CN103036664 A CN 103036664A
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Abstract
The invention discloses a multiplex method of a channel in a digital audio broadcasting. The information transmitted on a digital audio broadcasting communication channel is divided into a business descriptor and a business data. The business descriptor is packed in a first multiplex frame mode to form a control multiplex frame. The business data is packed by a second multiplex frame to form a business multiplex frame. A business descriptor channel and a business data channel are provided in each logic frame to respectively bear one control multiplex frame and one or more business multiplex frame. According to the multiplex method of the channel in the digital audio broadcasting, multiplex flexibility and high efficiency of the business can be kept, and complete separation between the control communication channel and the business communication channel is achieved. The interference from the control communication channel to the business communication channel is reduced, at the same time, parallel receiving of the control communication channel and the business communication channel is further achieved, the support from a system to a dynamic communication channel and a dynamic business is increased, pay expenses of a control business are reduced, and multiplex efficiency is further improved.
Description
Technical field
The present invention relates to communication and digital audio broadcasting field, relate in particular to the multiplexing method of passage in a kind of digital audio broadcasting.
Background technology
Multiplexing function is to finish Information encapsulation and arrangements such as looking audio frequency, data, electron service instruction in the communications field, can transmit at transmission channel.In digital multimedia broadcasting system in the past, adopted the multiplexing method of time-division slot such as CMMB China Mobile multimedia broadcasting system, the principal character of this method comprises: each broadcast channel transmission frame is divided into 40 time slots, be numbered TS0 to TS39, wherein, TS0 is as the control logic channel, and TS1 ~ TS39 is as service logical channels; Several continuous time slots consist of a multiplexed frame, and all time slots of this multiplexed frame all adopt identical physical layer encodes and modulation parameter, and this physical layer parameter is provided by the multiplexing allocation list among the TS0; Each multiplexed frame can comprise one or more multiplexed sub frames, and each multiplexed sub frame is used for carrying an independent business.This multiplexing method has plurality of advantages, if realize that service bandwidth distributes flexibly, support multiple business service quality and fast professional switching, also brought higher multiplexing efficiency based on the multiplexing structure of multiplexed frame and multiplexed sub frame, but also had following problem:
At first, because the control logic channel has adopted the modulation and demodulation mode that is different from service logical channels, therefore, CMMB need to receive when receiving business step by step, i.e. demultiplexing from control logic channel TS0 at first, obtain the physical layer parameter of other service logical channels, receive data on the service logical channels with this parameter again.In case the multiplexing control table on the control channel changes, will cause again receiving the control logic channel, this business that will interrupt on the current service logical channels receives, i.e. and the renewal of multiplexing control table will affect the reception of service logical channels.
Secondly, adopt a time slot to come the communicating control information table also to bring waste, when a common time slot is used for service data transmission, can support the transmission of 140Kbps, but the required bandwidth of per second control information transmission table only needs several Kbps, and this has just caused the waste of bandwidth.
Therefore, (for the digit broadcasting system of 87MHz～108MHz), need to propose a kind of multiplexing method of new passage, overcome defective of the prior art for working in traditional analog FM broadcasting frequency range.
Summary of the invention
In order one of to solve the problems of the technologies described above, the invention provides the multiplexing method of passage in a kind of digital audio broadcasting, need to be divided in the information of digital audio broadcasting channel business description information and business datum; Pack described business description information with the formation control multiplexed frame with the first multiplexed frame pattern; Pack described business datum to form the 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.
Especially, 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 the field of in the multiplex frame head of described control multiplexed frame, inserting contained control information table quantity in this multiplexed frame payload of indication and each control information table length.
Described control information table comprises period service duplexing configuration list and network information table, and period service duplexing configuration list and network information table are used for carrying respectively the information of each the service integration frame configuration in the current frequency and the attribute information of digital audio broadcasting network and adjacent area network thereof.
And, described method also comprises the steps: when the length of described control information table surpasses the active volume of business description information channel in the logical frame, described control information table is carried out segmentation, and in different logical frame, transmit the control information table after the 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 renewal sequence number, multiplexed frame sign, multiplexed frame transmission mode, the indication of business datum hierarchical modulation, business datum are just protected the service identification of indication, multiplexed sub frame quantity and each multiplexed sub frame.
The step of described segmentation also comprises: the information that all comprises table identification number, segment length, section sequence number, hop count amount, period service duplexing configuration list renewal sequence number in each segmentation; Corresponding multiplexed frame transmission mode, the indication of business datum hierarchical modulation, the business datum of multiplexed frame sign just protects the service identification of indication, multiplexed sub frame quantity and each multiplexed sub frame to be retained in the segmentation; And corresponding multiplexed frame transmission mode, the indication of business datum hierarchical modulation, the business datum of different multiplexed frame signs just protects the service identification of indication, multiplexed sub frame quantity and each multiplexed sub frame can be distributed in the different segmentations.
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 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.
The step of described segmentation also comprises: all comprise table identification number, segment length, section sequence number, hop count amount and update sequence number of network information list in each segmentation; The character of the centre frequency of national code, network number, network frequency quantity and each frequency, network title length and each title, adjacent area the number networks are retained in the segmentation; And the adjacent area network number of an adjacent area network, adjacent area network frequency quantity and adjacent area network center frequency be retained in the segmentation, and the adjacent area network number of different adjacent areas network, adjacent area network frequency quantity are retained in the different segmentations with adjacent area network center frequency.
Utilize multiplexing method of the present invention to adapt to the physical layer transmission characteristics of digital audio broadcast system.Flexibility and high efficiency that this had both kept service integration have realized again separating fully of control channel (business description information channel) and Traffic Channel (business datum passage).Thereby so that not needing that control channel is carried out demultiplexing, terminal can normally not receive Traffic Channel, reduced the interference of control channel to Traffic Channel, further realize simultaneously the parallel receive of control channel and Traffic Channel, strengthened the support of system to dynamic channel and dynamic service, reduce the expense of service control, further improved multiplexing efficient.
Description of drawings
Above-mentioned and/or the additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 shows the schematic diagram of multiplexing part in the digital audio broadcasting front end system;
Fig. 2 shows the multiplexed frame structure according to the embodiment of the invention;
Fig. 3 shows according to the corresponding relation of the multiplexed frame of the embodiment of the invention and channel superframe and multiplexed frame structure;
Fig. 4 shows the control multiplexed frame frame head structure according to the embodiment of the invention;
Fig. 5 shows the control multiplexed frame frame head parameter configuration according to the embodiment of the invention;
Fig. 6 shows the period service duplexing configuration list definition according to the embodiment of the invention;
Fig. 7 shows the network information table definition according to the embodiment of the invention;
Fig. 8 shows the service integration frame structure that adopts not stratified modulation system according to the embodiment of the invention;
Fig. 9 shows the service integration frame structure according to the employing hierarchical modulation mode of the embodiment of the invention;
Figure 10 shows the service integration frame frame head structure according to the embodiment of the invention;
Figure 11 shows the service integration frame frame head parameter configuration according to the embodiment of the invention;
Figure 12 shows according to the multiplexed sub frame structure in the service integration frame frame payload of the embodiment of the invention.
Embodiment
The below describes embodiments of the invention in detail, and the example of described embodiment is shown in the drawings, and wherein identical or similar label represents identical or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.
Digital audio broadcast system is to work in traditional analog FM broadcasting frequency range (digit broadcasting system of 87MHz～108MHz) is by the broadcast of digital coding modulation technology DARS and data service.The channel multiplexing method of digital audio broadcasting of the present invention has adopted orthogonal multiple carrier OFDM technology in physical layer, and be physical layer signaling information, business description information according to subcarrier in frequency domain, business datum has been divided different transmission channels, respectively the system information passage, business description information channel and business datum passage.
In order one of to solve the problems of the technologies described above, provide a kind of multiplexing method of passage in a kind of digital audio broadcast system of the present invention.At first, need to be divided in the information of digital audio broadcasting channel business description information and business datum, in the front end system of digital audio broadcasting of the present invention, multiplexing purpose is to carry out Information encapsulation and the arrangements such as audio frequency, data, electron service instruction, can transmit at broadcast channel, see Fig. 1, the audio frequency Basic Flow of same business and data flow are encapsulated in one or more multiplexed sub frames as business datum; The supplementarys such as urgent broadcast, electron service instruction, user management are also as business datum but be encapsulated in respectively in the different multiplexed sub frames.Control information table and network information table encapsulate as control information.
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 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.Described the first multiplexed frame pattern and the second multiplexed frame pattern will be discussed in more detail below.The multiplexed frame of different identification sends with different physical layer logic channels in channel treatment processes.
Specifically, as shown in Figure 3, the channel of audio broadcasting adopts a channel super frame period mode, and a superframe is comprised of a plurality of channel logical frame, for example, form each channel logical frame by 4 channel logical frame and for the multiplexing passage that provides business description information channel and business datum passage are arranged.According to the structure of business description information channel and business datum passage, multiplexed frame is divided into two types of control multiplexed frame and service integration frames.Various control information tables are carried in the business description information channel with control multiplexed frame payload form, and the miscellaneous service data are carried in the business datum passage with service integration frame payload form.The control information table according to the capacity of business description information channel transmit successively on the passage and allow a control information table segmenting after transmit successively by section.
The structure of described multiplexed frame as shown in Figure 2, especially, multiplexed frame only carries a multiplexed frame a logical frame---comprise the service integration frame and the control multiplexed frame is comprised of multiplex frame head, multiplexed frame payload and filling.Filling part can be filled with complete 1.Wherein, a control of the business description information channel of logical frame carrying multiplexed frame, identical service integration frame of business datum passage carrying of protective rate in the logical frame.
Especially, with the first multiplexed frame pattern pack described business description information with form one control multiplexed frame step comprise:
In the multiplexed frame payload of described control multiplexed frame, insert one or more control information tables.Comprise one or more control information tables in the multiplexed frame payload of the control multiplexed frame of a business description information carrying.In addition, as shown in Figure 4, in the multiplex frame head of described control multiplexed frame, insert the field of contained control information table quantity in this multiplexed frame payload of indication and each control information table length.And in described multiplex frame head, insert the length of first control information table in the indication multiplexed frame payload and the length of other control information tables.
In the present embodiment, described control information table comprises period service duplexing configuration list and network information table, is used for carrying respectively the information of each the service integration frame configuration in the current frequency and the attribute information of digital audio broadcasting network and adjacent area network thereof.Described control information table identifies with the table identification number, and the distribution of table identification number as shown in Figure 5.Especially, when the length of described control information table surpasses the active volume of business description information channel in the logical frame, described control information table is carried out segmentation, and in different logical frame, transmit the control information table after the described segmentation.
Described period service duplexing configuration list has been described the information of each the service integration frame configuration in the current frequency; such as service identification corresponding to the multiplexed sub frame number of each service integration frame and subframe etc., for example comprise: table identification number, segment length, section sequence number, hop count amount, period service duplexing configuration list upgrade sequence number, multiplexed frame sign, multiplexed frame transmission mode, the business datum hierarchical modulation is indicated, business datum is just protected indication, multiplexed sub frame quantity and each multiplexed sub frame service identification.The example of a period service duplexing configuration list as shown in Figure 6, wherein M1 represents multiplexed frame sign quantity; M2 represents multiplexed sub frame quantity.Wherein:
Multiplexed frame sign quantity: 6 bit fields represent the quantity of the multiplexed frame sign that comprises in the current segmentation.
The multiplexed frame sign: 6 bit fields, the MF ID of identification service multiplexed frame is since 1 value.
The indication of business datum hierarchical modulation: 1 bit field, 1 expression business datum is used hierarchical modulation, and hierarchical modulation is not used in 0 expression.
Business datum is just protected indication: 1 bit field, and 1 expression business datum is used high protection, and 0 expression business datum is used low protection.
The multiplexed frame transmission mode: 4 bit fields, the transmission mode of expression service integration frame, each field represent current multiplexed frame sign institute counterlogic frame and take situation.Bit from left to right is corresponding the 1st to the 4th logical frame successively.Bit is that logical frame corresponding to 1 expression is occupied, is that logical frame corresponding to 0 expression is unoccupied.
Multiplexed sub frame quantity: 4 bit fields, the multiplexed sub frame quantity that expression service integration frame comprises.
Service identification: 16 bit fields, represent each multiplexed sub frame corresponding professional identification number.
Preferably, described step to the period service duplexing configuration list segmentation is the information that all comprises table identification number, segment length, section sequence number, hop count amount, period service duplexing configuration list renewal sequence number in each segmentation; Corresponding multiplexed frame transmission mode, the indication of business datum hierarchical modulation, the business datum of multiplexed frame sign just protects the service identification of indication, multiplexed sub frame quantity and each multiplexed sub frame to be retained in the segmentation; And corresponding multiplexed frame transmission mode, the indication of business datum hierarchical modulation, the business datum of different multiplexed frame signs just protects the service identification of indication, multiplexed sub frame quantity and each multiplexed sub frame can be distributed in the different segmentations.
The digital audio broadcasting transfer system of network operator's operation and management is called a network; There is other network that intersects to be called the adjacent area network with its area of coverage known to this network.As shown in Figure 7, described network information table has been described and has been comprised: 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 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.Wherein: N1 represents current network frequency quantity; N2 represents current network title length; N3 represents adjacent area the number networks; N4 represents corresponding specific adjacent area network frequency quantity.
Described step to network information table segmenting is shown identification number, segment length, section sequence number, hop count amount and update sequence number of network information list for all comprising in each segmentation; The character of the centre frequency of national code, network number, network frequency quantity and each frequency, network title length and each title, adjacent area the number networks are retained in the segmentation; And the adjacent area network number of an adjacent area network, adjacent area network frequency quantity and adjacent area network center frequency be retained in the segmentation, and the adjacent area network number of different adjacent areas network, adjacent area network frequency quantity are retained in the different segmentations with adjacent area network center frequency.
In described logical frame, insert one or more service integration frames.As shown in Figure 8, described service integration frame payload is comprised of one or more multiplexed sub frames, and multiplexed sub frame is used for bearer service, and a multiplexed sub frame can only carry the data of a business, when a business is not used the hierarchical coding technology, a professional corresponding multiplexed sub frame; When a professional use hierarchical coding technology, one professional according to minute progression corresponding 2 or more multiplexed sub frame.
Especially, when channel adopted evenly protection and layering transfer mode, the service integration number of frames that sends in a channel logical frame can comprise the service integration frame of a for example high protection and the service integration frame of a low protection, as shown in Figure 9.Structural group prejudice Figure 10 of service integration frame head, specific definition as shown in figure 11.Wherein multiplexed sub frame is comprised of subframe head, audio section, data segment and filling, and its specific definition as shown in figure 12.
Utilize channel multiplexing method of the present invention can bring following advantage:
At first, multiplexing method of the present invention has adapted to the physical layer transmission characteristics of digital audio broadcast system.The physical layer of digital audio broadcast system is business description information channel and business datum passage by subcarrier with channel distribution on frequency domain, the control multiplexed frame structure that wherein business description information channel adopts can keep flexibility and the high efficiency of service integration, has removed unnecessary physical layer parameter information simultaneously in period service duplexing configuration list.
Secondly, this multiplexing method has been realized separating fully of control channel (business description information channel) and Traffic Channel (business datum passage).Because will receive the required physical layer encodes of control channel and Traffic Channel and modulation parameter puts in the physical layer system information channel and transmits, therefore terminal does not need that control channel is carried out demultiplexing and can normally receive Traffic Channel, this has reduced the interference of control channel to Traffic Channel, further realize the parallel receive of control channel and Traffic Channel, strengthened the support of system to dynamic channel and dynamic service.
Again, further improved multiplexing efficient.It is several Kbps that the business description information channel is come the bandwidth of multiplexing allocation list of transport service etc., bandwidth (tens Kbps are to hundreds of Kbps) much smaller than the business datum passage, owing to do not need from professional data channel, to reserve a multiplexed frame as control channel, therefore, greatly reduce the expense of service control.
At last, multiplexing method of the present invention also provides the support to the hierarchical coding audio service; Can protect the data of level put in the business datum passage of different transmission qualities the difference in the audio service and transmit, to improve the overall performance of system.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle 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 (8)
1. the multiplexing method of passage in the digital audio broadcasting is characterized in that:
Need to be divided in the information of digital audio broadcasting channel business description information and business datum;
Pack described business description information with the formation control multiplexed frame with the first multiplexed frame pattern;
Pack described business datum to form the 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:
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 in this multiplexed frame payload of indication and each control information table length.
3. method according to claim 2 is characterized in that:
Described control information table comprises period service duplexing configuration list and network information table, is used for carrying respectively the information of each the service integration frame configuration in the current frequency and the attribute information of digital audio broadcasting network and adjacent area network thereof.
4. method according to claim 3, it is characterized in that: described method also comprises the steps:
When the length of described control information table surpasses the active volume of business description information channel in the logical frame, described control information table is carried out segmentation, and in different logical frame, transmit the control information table after the described segmentation.
5. method according to claim 4, it is characterized in that: described period service duplexing configuration list comprises:
Table identification number, segment length, section sequence number, hop count amount, period service duplexing configuration list renewal sequence number, multiplexed frame sign, multiplexed frame transmission mode, the indication of business datum hierarchical modulation, business datum are just protected the service identification of indication, multiplexed sub frame quantity and each multiplexed sub frame.
6. method according to claim 5, its spy is being: the step of described segmentation also comprises:
The information that in each segmentation, all comprises table identification number, segment length, section sequence number, hop count amount, period service duplexing configuration list renewal sequence number;
Corresponding multiplexed frame transmission mode, the indication of business datum hierarchical modulation, the business datum of multiplexed frame sign just protects the service identification of indication, multiplexed sub frame quantity and each multiplexed sub frame to be retained in the segmentation; And
Corresponding multiplexed frame transmission mode, the indication of business datum hierarchical modulation, the business datum of different multiplexed frame signs just protects the service identification of indication, multiplexed sub frame quantity and each multiplexed sub frame can be distributed in the different segmentations.
7. method according to claim 4, it 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 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.
8. method according to claim 7, it 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;
The character of the centre frequency of national code, network number, network frequency quantity and each frequency, network title length and each title, adjacent area the number networks are retained in the segmentation; And
The adjacent area network number of an adjacent area network, adjacent area network frequency quantity and adjacent area network center frequency are retained in the segmentation, and the adjacent area network number of different adjacent areas network, adjacent area network frequency quantity are retained in the different segmentations with adjacent area network center frequency.
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