CN107295366B - Method and system for scheduling and multiplexing broadcast multi-pipeline service data - Google Patents

Abstract

The present invention provides a method and system for scheduling and multiplexing broadcast multi-pipeline service data. The method for scheduling and multiplexing broadcast multi-pipeline service data includes: acquiring multi-pipeline service data parameters and system parameters; receiving data from each service pipe and buffering them in the buffers of each service pipe; and repeatedly performing the following steps until each service pipe is Obtain the number of data baseband frames; obtain the multi-pipeline service data parameters and system parameters, form the signaling frame load information and encapsulate it into a signaling baseband frame, and include the signaling baseband frame in the signaling baseband frame. header information, signaling frame load information; the signaling baseband frame and all the obtained data baseband frames are time-division multiplexed to form a baseband frame sequence that can be carried by one physical frame. The schedules in turn form baseband frames and map to a physical frame for transmission.

Description

Method and system for scheduling and multiplexing of broadcast multi-pipeline service data

technical field

The invention relates to the field of digital broadcasting and television systems, in particular to a method and system for scheduling and multiplexing data of broadcasting multi-pipeline services.

Background technique

With the development of multimedia services and terminal forms, the digital TV broadcasting system has an increasing demand for supporting multiple QoS services. The new generation of digital TV broadcasting systems, such as European DVB-T2/NGH and American ATSC3.0 digital TV systems, all use pipeline technology to support multiplexing and transmission of different business data formats and different modulation and coding services in one physical frame data.

To achieve multi-pipe transmission, it is necessary to ensure that the multiplexer schedules multiple pipeline service data streams of different rates to be framed and seamlessly cascaded; so that the service data carried by each logical pipe (PLP) can be transmitted to the broadcast modulator in a certain order. After adopting different coding and modulation, it is mapped to the corresponding physical resources of each pipeline for transmission. Because the business data of each pipeline is input in multiple ways in parallel, and the rates are different. Therefore, framing multiple pipeline service data with different data lengths has become a key technology to achieve effective matching transmission between each pipeline service data and physical resources.

In view of this, how to find a convenient and quick technical solution for scheduling and processing the service data of each pipeline and mapping it to the physical frame has become an urgent problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method and system for scheduling and multiplexing broadcast multi-pipeline service data, which is used to solve the difficulty in scheduling and assembling multiple pipe service data streams of different rates in the prior art. Problems with physical frames.

In order to achieve the above object and other related objects, the present invention provides a method for scheduling and multiplexing broadcast multi-pipeline service data. The method for scheduling and multiplexing broadcast multi-pipeline service data includes: step S1, acquiring multi-pipeline service data parameters and system parameters, The multi-pipeline service data parameters include the number of service pipes, the information bit length of the previous code block used for encoding each service pipe data, or the total number of pre-encoded information bits carried in a physical frame and the number of coding blocks; according to each service pipe The information bit length of the previous code block used for encoding or the total number of pre-encoded information bits carried in a physical frame and the number of encoding blocks determine the number of service data bits and the number of data baseband frames carried in each service pipeline data baseband frame. Step S2, receive each business pipeline data, and be buffered in the cache of each business pipeline respectively; Execute the following steps repeatedly until each business pipeline all obtains data baseband frame number data baseband frame: detect the data size in each business pipeline cache, Determine a service pipeline whose cached data size is greater than the number of pipeline service data bits; select a service pipeline with a cached data size greater than the number of pipeline service data bits, and intercept the service pipeline service data from the selected service pipeline cache bit number of data, and encapsulate the intercepted data into a data baseband frame, the data baseband frame includes the data baseband frame header information and the intercepted data; the data baseband frame header information includes the data baseband frame The serial number information of the physical frame to which it belongs and the serial number information of the pipeline to which the data baseband frame belongs; Step S3, obtain the multi-pipeline service data parameters and system parameters, form the signaling frame load information and encapsulate it into a signaling baseband frame, The signaling baseband frame includes the signaling baseband frame header information and the signaling frame load information; the signaling baseband frame header information includes the sequence number information of the physical frame to which the signaling baseband frame belongs; Step S4: The baseband frame and all the obtained data baseband frames are time-division multiplexed to form a sequence of baseband frames that can be carried by one physical frame. The information bits carried in the signaling baseband frame and the data baseband frame are encoded and modulated and then mapped to a data area of a physical frame for transmission. The physical frame further includes physical frame header information, and the physical frame header information includes the Sequence number information of the physical frame.

Optionally, the service pipeline cache adopts FIFO cache.

Optionally, the specific implementation of selecting a service pipeline in a service pipeline whose cached data size is greater than the number of service data bits in the pipeline includes: selecting a service pipeline whose cached data size is greater than the number of service data bits in the pipeline with the largest cached data size. business pipeline.

Optionally, the specific implementation of segmenting the signaling baseband frame and all the obtained data baseband frames to form a baseband frame sequence that can be carried by one physical frame includes: according to the signaling baseband frame preceding the data baseband frame. The latter sequence is mapped to the data area of the physical frame; the data baseband frame is mapped to the data area of the physical frame according to the sequence number of the pipeline to which it belongs and the sequence of generation.

Optionally, the physical frame further includes padding data and/or check data.

Optionally, the data baseband frame further includes padding data and/or check data.

Optionally, the signaling baseband frame further includes padding data and/or check data.

Optionally, the check data includes CRC check data.

The present invention provides a system for scheduling and multiplexing broadcast multi-pipeline service data. The system for scheduling and multiplexing broadcast multi-pipeline service data includes: a service pipe parameter acquisition module for acquiring multi-pipeline service data parameters and system parameters. The data parameters include the number of service pipelines, the information bit length of the previous code block used for coding each service pipeline data, or the total number of information bits before coding and the number of coding blocks carried in a physical frame for the pipeline; The information bit length of the previous code block or the total number of information bits before encoding carried in a physical frame and the number of encoding blocks determine the number of service data bits and the number of data baseband frames carried in each service pipeline data baseband frame; service data The cache processing module is used to receive the data of each service pipeline and cache it in the cache of each service pipeline respectively; repeatedly execute the following steps until each service pipeline obtains the number of data baseband frames and the number of data baseband frames: Detect the data in the cache of each service pipeline size, determine a service pipeline whose cached data size is greater than the number of service data bits in the pipeline; select a service pipeline with a cached data size greater than the number of service data bits in the pipeline, and intercept the service pipeline from the selected service pipeline cache data of the number of service data bits, and encapsulate the intercepted data into a data baseband frame, the data baseband frame includes the data baseband frame header information and the intercepted data; the data baseband frame header information includes the data The serial number information of the physical frame to which the baseband frame belongs and the serial number information of the pipeline to which the data baseband frame belongs; the signaling frame generation module is used to obtain the multi-pipeline service data parameters and system parameters, form signaling frame load information and encapsulate it into In a signaling baseband frame, the signaling baseband frame includes signaling baseband frame header information and signaling frame load information; the signaling baseband frame header information includes sequence number information of the physical frame to which the signaling baseband frame belongs; The baseband frame multiplexing module is used for time-division multiplexing the signaling baseband frame and all the obtained data baseband frames to form a baseband frame sequence that can be carried by one physical frame.

Optionally, the service pipeline cache adopts FIFO cache.

Optionally, the specific implementation of selecting a service pipeline in a service pipeline whose cached data size is greater than the number of service data bits in the pipeline includes: selecting a service pipeline whose cached data size is greater than the number of service data bits in the pipeline with the largest cached data size. business pipeline.

Optionally, the specific implementation of segmenting the signaling baseband frame and all the obtained data baseband frames to form a baseband frame sequence that can be carried by one physical frame includes: according to the signaling baseband frame preceding the data baseband frame. The latter sequence is mapped to the data area of the physical frame; the data baseband frame is mapped to the data area of the physical frame according to the sequence number of the pipeline to which it belongs and the sequence of generation.

Optionally, the data baseband frame further includes padding data and/or check data.

Optionally, the signaling baseband frame further includes padding data and/or check data.

Optionally, the check data includes CRC check data.

As described above, the method and system for scheduling and multiplexing data of broadcast multi-pipeline services of the present invention have the following beneficial effects: it can realize multi-pipeline services with different rates and different QoS requirements (modulation methods, coding rate and code length). Data, through dynamic scheduling, form baseband frames in turn, and map to a physical frame for transmission.

Description of drawings

FIG. 1 is a schematic flowchart of an embodiment of a method for scheduling and multiplexing broadcast multi-pipe service data according to the present invention.

FIG. 2 is a schematic block diagram of an embodiment of the broadcast multi-pipe service data scheduling and multiplexing system of the present invention.

FIG. 3 is a schematic diagram showing the principle of another embodiment of the broadcast multi-pipe service data scheduling and multiplexing system of the present invention.

FIG. 4 is a schematic diagram of a data baseband frame format of an embodiment of the broadcast multi-pipe service data scheduling and multiplexing system of the present invention.

FIG. 5 is a schematic diagram of a signaling baseband frame format according to an embodiment of the broadcast multi-pipe service data scheduling and multiplexing system of the present invention.

FIG. 6 is a schematic diagram of baseband frame multiplexing according to an embodiment of the broadcast multi-pipe service data scheduling and multiplexing system of the present invention.

FIG. 7 is a schematic diagram showing the simulation result of the change of the FIFO read/write pointer of the pipe 1 according to an embodiment of the broadcast multi-pipe service data scheduling and multiplexing system of the present invention.

FIG. 8 is a schematic diagram showing a simulation result of the change of the FIFO read/write pointer of the pipe 2 according to an embodiment of the broadcast multi-pipe service data scheduling and multiplexing system of the present invention.

FIG. 9 is a schematic diagram showing a simulation result of two pipeline FIFO read timings according to an embodiment of the broadcast multi-pipeline service data scheduling and multiplexing system of the present invention.

FIG. 10 is a schematic diagram showing the simulation result of the format of the signaling baseband frame and the data baseband frame carried in a generated physical frame according to an embodiment of the broadcast multi-pipe service data scheduling and multiplexing system of the present invention.

Component label description

1 Broadcast multi-pipeline service data scheduling

multiplexing system

11 Service pipeline parameter acquisition module

12 Business data cache processing module

13 Signaling frame generation module

14 Baseband frame multiplexing module

S1～S4 steps

Detailed ways

The embodiments of the present invention are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

It should be noted that the drawings provided in this embodiment are only to illustrate the basic concept of the present invention in a schematic way, so the drawings only show the components related to the present invention rather than the number, shape and the number of components in actual implementation. For dimension drawing, the type, quantity and proportion of each component can be changed at will in actual implementation, and the component layout may also be more complicated.

The present invention provides a method for scheduling and multiplexing broadcast multi-pipeline service data. In one embodiment, as shown in FIG. 1 , the method for scheduling and multiplexing broadcast multi-pipe service data includes:

Step S1, obtain multi-pipeline service data parameters and system parameters, the multi-pipeline service data parameters include the number of service pipes, the information bit length of the previous code block used for coding each service pipe data or the pipe before coding carried in a physical frame. The total number of information bits and the number of coding blocks; the data baseband of each service pipeline is determined according to the information bit length of the previous code block used for coding each service pipeline data or the total number of information bits before coding and the number of coding blocks carried in a physical frame. The number of service data bits carried in the frame and the number of data baseband frames. In one embodiment, the number of service data bits carried in each service pipeline data baseband frame is equal to the information bit length of the previous code block used for coding each service pipeline data or the total number of information bits before the pipeline coding carried in one physical frame ; The number of data baseband frames carried in each service pipeline data baseband frame is equal to the number of coding blocks used for each service pipeline data.

Step S2: Receive the data of each service pipeline and cache them in the caches of each service pipeline respectively; repeatedly perform the following steps until each service pipeline obtains the number of data baseband frames and the number of data baseband frames: detect the data size in the cache of each service pipeline, determine Cache a service pipeline whose size is greater than the number of pipeline service data bits; select a service pipeline with a cached data size greater than the number of pipeline service data bits, and intercept the service pipeline service data bits from the selected service pipeline cache number of data, and encapsulate the intercepted data into a data baseband frame, the data baseband frame includes the data baseband frame header information and the intercepted data; the data baseband frame header information includes the data baseband frame belongs to The serial number information of the physical frame and the serial number information of the pipeline to which the data baseband frame belongs. The data intercepted from the selected service pipeline cache will be deleted or marked as invalid data in the service pipeline cache. In one embodiment, the service pipeline buffer adopts a FIFO buffer (referred to as FIFO). FIFO is the abbreviation of English First InFirst Out, which is a first-in, first-out data buffer. When the FIFO is operated, the read data will not be deleted, but since the read and write operations are performed in a loop, that is, the old data will be overwritten by the newly written data, so the data in the FIFO must be read in time, otherwise it will cause Data is lost due to overwriting. In one embodiment, a specific implementation of selecting a service pipeline in a service pipeline whose cached data size is greater than the number of service data bits in the pipeline includes: selecting a cached data size in a service pipeline whose cached data size is greater than the number of service data bits in the pipeline largest business pipeline. In one embodiment, when the total number of information bits before encoding of the pipeline carried in one physical frame is not equal to an integer multiple of the length of the information bits of the previous code block, the number of service data bits needs to pass through the pipeline carried in one physical frame. The total number of information bits before encoding and the number of encoding blocks are jointly determined. The data baseband frame also includes padding data and/or check data. The check data includes CRC check data. The data stream of the service pipeline includes a TS (Transport Stream) stream. A baseband frame (also called a BB frame) is a data packing block. After the TS stream enters the multiplexer, the TS data packet is cut based on a fixed bit size (DFL, that is, DataField Length). According to the protocol, add the BB Header field of the baseband frame header to this DFL, and fill in the Padding at the end of the frame. Thus BB Header+DFL+Padding=BB Frame. This is what forms a complete BB frame. BB is the basic unit of TS data packaging, and then it is encoded by BCH and LDPC to form a forward error correction code FEC data block. The size of the data baseband frame is an integer multiple of the data size carried by the number of basic units. CRC is Cyclic Redundancy Check (Cyclic Redundancy Check): It is the most commonly used error check code in the field of data communication. It is characterized in that the length of the information field and the check field can be arbitrarily selected.

Step S3, obtain the multi-pipeline service data parameters and system parameters, form signaling frame load information and encapsulate it into a signaling baseband frame, where the signaling baseband frame includes signaling baseband frame header information and signaling frame load information ; The signaling baseband frame header information includes sequence number information of the physical frame to which the signaling baseband frame belongs. In one embodiment, the signaling baseband frame further includes padding data and/or check data. The check data includes CRC check data. In one embodiment, the system parameters include a sampling period, the length of one data symbol, the number of basic units that can be carried in one data symbol, the maximum number of the data symbols that one physical frame can carry, and one physical frame. The total length of all symbols carrying non-data traffic in . The service data parameters of each pipeline include the rate of transmitting service data, modulation order, coding rate, coding code length, and the like.

Step S4, the signaling baseband frame and all the obtained data baseband frames are time-division multiplexed to form a baseband frame sequence that can be carried by one physical frame. The information bits carried in the signaling baseband frame and the data baseband frame are encoded and modulated and then mapped to a data area of a physical frame for transmission. The physical frame further includes physical frame header information, and the physical frame header information includes the Sequence number information of the physical frame. In one embodiment, the signaling baseband frame and all the obtained data baseband frames are time-division multiplexed to form a baseband frame sequence that can be carried by one physical frame. The baseband frame is mapped to the data area of the physical frame in the following sequence; the data baseband frame is mapped to the data area of the physical frame according to the sequence number of the pipeline to which it belongs and the sequence of generation.

In one embodiment, the method for scheduling and multiplexing broadcast multi-pipe service data includes:

1. Perform FIFO buffer (referred to as FIFO) processing on the input data of N-channel pipeline data streams (such as TS streams); each pipeline has a FIFO.

确定各管道的数据基带帧中承载的业务数据比特数目

其中，

i＝1,…,N_PLP，N_PLP为调度复用系统支持的输入业务管道数；2. According to the information bit length of the previous code block used for encoding the service data of each pipeline

Determine the number of service data bits carried in the data baseband frame of each pipeline

in,

i=1,..., _NPLP , where _NPLP is the number of input service pipes supported by the scheduling multiplexing system;

确定一个物理帧中各管道的数据基带帧数量

即

i＝1,…,N_PLP；3. According to the obtained number of coding blocks of each pipeline carried in the physical frame of the baseband frame output by the scheduling multiplexing system

Determine the number of data baseband frames for each pipeline in a physical frame

which is

i=1,...,N _PLP ;

以及各管道FIFO中的数据量状态，选择某路管道FIFO，从中读取

比特数据进行数据基带帧成帧操作。具体包括：4. According to the number of service data bits carried in the data baseband frame of each pipeline

And the data volume status in each pipeline FIFO, select a pipeline FIFO, read from it

The bit data is subjected to data baseband framing operation. Specifically include:

i＝1,…,N_PLP；a) Detect the amount of data in each pipeline FIFO

i=1,...,N _PLP ;

的FIFO，列出所有可能的FIFO序号集Ω，Ω∈1,…,N_PLP；b) select all

FIFO, list all possible FIFO sequence number sets Ω, Ω∈1,...,N _PLP ;

c) Select the FIFO with the largest FIFO data volume in the FIFO sequence number set Ω, its FIFO sequence number is i'(i'∈Ω), and its data volume is

比特数据，进行数据基带帧成帧操作；d) read from the i'th FIFO

Bit data, perform data baseband framing operation;

比特数据添加数据基带帧头、填充比特、校验比特后，生成一个数据基带帧。其中数据基带帧头中至少包含识别该数据基带帧所属管道的序号i(i＝1,…,N_PLP)的信息PLP_ID和该数据基带帧所属物理帧的序号信息Frm_ID；e) will

After adding the data baseband frame header, padding bits, and check bits to the bit data, a data baseband frame is generated. Wherein the data baseband frame header contains at least the information PLP_ID identifying the serial number i (i=1, . . . , N _PLP ) of the pipeline to which the data baseband frame belongs and the serial number information Frm_ID of the physical frame to which the data baseband frame belongs;

f) Repeat steps a) to e).

5. Based on the obtained service data parameters and system parameters, the signaling frame load information is formed, and the signaling baseband frame framing operation is performed;

6. After adding the signaling frame payload information to the signaling baseband frame header, padding bits, and check bits, a signaling baseband frame is generated. Wherein the signaling baseband frame header at least contains the sequence number information Frm_ID of the physical frame to which the signaling baseband frame belongs;

个数据基带帧按照信令基带帧在先数据基带帧在后的顺序时分复用后输出。7. Combine 1 signaling baseband frame and

The data baseband frames are time-division multiplexed and output in the order that the signaling baseband frame precedes the data baseband frame.

The method for scheduling and multiplexing the broadcast multi-pipeline service data of the present invention uses the known multi-pipeline service data parameters, such as the number of pipes, the rate of each pipe service data, the information bit length of the previous code block of forward error correction coding, etc., from In the multi-channel pipeline service data input in parallel, the appropriate pipeline service data is dynamically scheduled and selected in turn, and the data baseband framing processing is performed according to the information bit length of the previous code block. Make baseband framing processing; each signaling baseband frame is multiplexed with several data baseband frames, mapped to a physical frame for transmission; signaling or data bits in each baseband frame are processed by a physical layer encoding; the invention can realize Multi-pipeline service data with different rates and different QoS requirements (modulation mode, code rate and code length) are dynamically scheduled to form baseband frames in turn and map to a physical frame for transmission. The main purpose of the present invention is to select and form a data baseband frame according to the different bit lengths of the input streams of multiple pipelines with different rates, and multiplex the formed signaling frame with the multiplexing system. , to output to the subsequent modulator, and then transmit the physical frame generated by the latter after coding and modulation. The information carried by one signaling baseband frame and several data baseband frames generated by the multiplexing system of the present invention can be carried and transmitted by one physical frame.

The invention provides a broadcast multi-pipe service data scheduling and multiplexing system. The method for scheduling and multiplexing broadcast multi-pipeline service data may apply the above-mentioned method for scheduling and multiplexing broadcast multi-pipeline service data. In one embodiment, as shown in FIG. 2 , the broadcast multi-pipe service data scheduling and multiplexing system 1 includes a service pipe parameter acquisition module 11, a service data buffer processing module 12, a signaling frame generation module 13, and a baseband frame multiplexing module module 14. in:

The service pipeline parameter acquisition module 11 is used to acquire multi-pipeline service data parameters and system parameters. The multi-pipeline service data parameters include the number of service pipes, the information bit length of the previous code block used for encoding each service pipe data, or the information carried in one physical frame. The total number of information bits before encoding and the number of encoding blocks of the pipeline; it is determined according to the information bit length of the previous code block used for encoding each service pipeline data or the total number of information bits before encoding and the number of encoding blocks carried in a physical frame. The number of service data bits and the number of data baseband frames carried in each service pipeline data baseband frame. In one embodiment, the number of service data bits carried in each service pipeline data baseband frame is equal to the information bit length of the previous code block used for encoding each service pipeline data; the number of data baseband frames carried in each service pipeline data baseband frame is equal to The number of coding blocks used for each service pipeline data.

The business data cache processing module 12 is connected to the business pipeline parameter acquisition module 11, and is used for receiving the data of each business pipeline and buffering them in the cache of each business pipeline respectively; the following steps are repeatedly performed until each business pipeline obtains the data of the number of data baseband frames. Baseband frame: Detect the data size in each service pipeline cache, and determine the service pipeline whose cached data size is greater than the number of service data bits in the pipeline; select a service pipeline whose cached data size is greater than the number of service data bits in the pipeline, from Intercepting the data of the number of bits of the service pipeline service data in the selected service pipeline cache, and encapsulating the intercepted data into a data baseband frame, where the data baseband frame includes the data baseband frame header information and the intercepted data; The data baseband frame header information includes serial number information of the physical frame to which the data baseband frame belongs and serial number information of the pipe to which the data baseband frame belongs. In one embodiment, the service pipeline buffer adopts a FIFO buffer. When the FIFO is operated, the read data will not be deleted, and the read and write operations are performed in a circular manner, that is, the old data will be overwritten by the newly written data, so the data in the FIFO must be read in time, otherwise it will cause the data to fail. overwritten and lost. In one embodiment, a specific implementation of selecting a service pipeline in a service pipeline whose cached data size is greater than the number of service data bits in the pipeline includes: selecting a cached data size in a service pipeline whose cached data size is greater than the number of service data bits in the pipeline largest business pipeline. The data baseband frame also includes padding data and/or check data. The check data includes CRC check data. The data stream of the service pipeline includes a TS (Transport Stream) stream. The data baseband frame (also called DBB frame) is a data packing block. After the TS stream enters the multiplexer, the TS data packet is cut based on a fixed bit size (DFL, that is, Data Field Length). According to the protocol, add the DBB Header field of the data baseband frame header to the DFL, and fill in the Padding at the end of the frame. Thus DBB Header+DFL+Padding=DBB Frame. This is what forms a complete DBB frame. DBB is the basic unit of TS data packaging, and then it is encoded by BCH and LDPC to form a forward error correction code FEC data block. The above repeatedly performed steps may be performed continuously, or may be triggered and performed according to a clock signal (or instruction). CRC (Cyclic Redundancy Check): It is the most commonly used error check code in the field of data communication. It is characterized in that the lengths of the information field and the check field can be arbitrarily selected.

The signaling frame generation module 13 is connected to the service pipeline parameter acquisition module 11, and is used for acquiring the multi-pipeline service data parameters and system parameters, forming signaling frame load information and encapsulating it into a signaling baseband frame. The frame includes signaling baseband frame header information and signaling frame load information; the signaling baseband frame header information includes sequence number information of the physical frame to which the signaling baseband frame belongs. In one embodiment, the signaling baseband frame further includes padding data and/or check data. The check data includes CRC check data. In one embodiment, the system parameters include a sampling period, the length of one data symbol, the number of basic units that can be carried in one data symbol, the maximum number of the data symbols that one physical frame can carry, and one physical frame. The total length of all symbols carrying non-data traffic in . The service data parameters of each pipeline include the rate of transmitting service data, modulation order, coding rate, coding code length, and the like.

The baseband frame multiplexing module 14 is connected with the service data buffer processing module 12 and the signaling frame generation module 13, and is used to time-division multiplex the signaling baseband frame and all the obtained data baseband frames, and the segmentation can be formed by a physical frame. Bearer baseband frame sequence. The information bits carried in the signaling baseband frame and the data baseband frame are encoded and modulated and then mapped to a data area of a physical frame for transmission. The physical frame further includes physical frame header information, and the physical frame header information includes the Sequence number information of the physical frame. In one embodiment, the signaling baseband frame and all the obtained data baseband frames are time-division multiplexed to form a baseband frame sequence that can be carried by one physical frame. The baseband frame is mapped to the data area of the physical frame in the following sequence; the data baseband frame is mapped to the data area of the physical frame according to the sequence number of the pipeline to which it belongs and the sequence of generation.

In one embodiment, the principle of the broadcast multi-pipeline service data scheduling and multiplexing system is shown in Figure 3, wherein:

The pipeline FIFO device respectively buffers the input data of the N channels of pipeline data streams (eg, TS streams).

i＝1,…,N_PLP，N_PLP为需要传输的业务管道数；根据一个物理帧中承载的各管道的编码块数量确定一个物理帧中各管道的数据基带帧数量N_DFFB。The service pipeline parameter acquisition device forms the signaling frame load information based on the obtained service data parameters and system parameters; and determines the service carried in the data baseband frame of each pipeline according to the information bit length of the previous code block used for encoding the service data of each pipeline. number of data bits

i=1,..., _{NPLP, where NPLP is the number of service pipes to be transmitted; the number N DFFB of data} baseband frames of each pipe in a physical frame is determined according to the number of coding blocks of each pipe carried in a physical frame.

The data reading control device selects the number of service data bits carried in the data baseband frame of each pipeline and the data volume status in each pipeline FIFO according to the service pipeline parameter acquisition device, and selects that the read data volume exceeds the data volume carried in the data baseband frame. A segment of data in the FIFO with the largest number of service data bits and the largest amount of data is subjected to subsequent pipeline data framing processing; the bit length of the segment of data is the number of service data bits carried in the data baseband frame of the pipeline corresponding to the FIFO.

The data framing device encapsulates a piece of data read from the FIFO into a data baseband frame, and each data baseband frame is transmitted through a physical layer data encoding code block. The data baseband frame format is shown in Figure 4. A data baseband frame includes the data baseband frame header, padding bits, CRC check bits, and data baseband frame load bits, wherein the data baseband frame header contains the serial number i (i=1,...,N _PLP ) that identifies the pipeline to which the data baseband frame belongs. ) information PLP_ID and the sequence number information Frm_ID of the physical frame to which the data baseband frame belongs.

The signaling framing device encapsulates the signaling frame payload information into signaling baseband frames, and each signaling baseband frame is transmitted through a physical layer signaling encoding code block. The format of the signaling baseband frame is shown in Figure 5. A signaling baseband frame includes a signaling baseband frame header, padding bits, CRC check bits, and signaling baseband frame payload information bits. The signaling baseband frame header at least includes sequence number information Frm_ID of the physical frame to which the signaling baseband frame belongs.

个数据基带帧。其中所有隶属不同管道的数据基带帧根据FIFO调度的顺序依次时分复用级联，并且各数据基带帧根据其所属管道采用的编码前一个码块的信息比特长度其长度可变。The baseband frame multiplexing device cascades the signaling baseband frame and the data baseband frame in a certain order and proportion. Generally, one physical frame carries one signaling baseband frame and several data baseband frames, and the signaling baseband frame precedes the data baseband frame. For frame transmission, the total number of data baseband frames is equal to the sum of the data baseband frames of all pipes carried in a physical frame. That is, the baseband frame multiplexing apparatus is used to assemble the data area of the physical frame. In one embodiment, the baseband frame multiplexing data in the data area of the physical frame is as shown in FIG. 6 . The baseband frame carried in the physical frame includes the first signaling baseband frame and

data baseband frame. All the data baseband frames belonging to different pipelines are time-division multiplexed and cascaded in sequence according to the order of FIFO scheduling, and each data baseband frame has a variable length according to the information bit length of the previous code block used by the pipeline to which it belongs.

比特，i＝1,2；4，根据上述业务数据参数计算并选定一组数据调度复用参数：1)管道1承载的数据基带帧数目

2)管道2承载的数据基带帧数目

3)确定一个物理帧中所有管道的数据基带帧数目之和

5，设定其他仿真参数，如FIFO位宽8比特，FIFO深度L_FIFO为1478字节，FIFO读写速率均为80MHz等。In one embodiment, under the condition of given system parameters, the scheme of the present invention is used to schedule the multiplexing effect with two PLPs. Assume that the data rate and system parameters to be transmitted are as follows: 1, the number of input pipes N _PLP = 2; 2, the input data of the two pipes are burst TS packets, the size of each burst packet is 188Byte, and the data flow rate is RTS1 = 2.1Mbps, RTS2=22.2Mbps; 3, the information bit length of the previous code block used by the two pipelines or the total number of information bits before the pipeline encoding carried in one physical frame

Bits, i=1, 2; 4, calculate and select a set of data scheduling multiplexing parameters according to the above service data parameters: 1) The number of data baseband frames carried by the pipeline 1

2) Number of data baseband frames carried by pipe 2

3) Determine the sum of the number of data baseband frames of all pipes in a physical frame

5. Set other simulation parameters, such as FIFO bit width 8 bits, FIFO depth L _FIFO is 1478 bytes, FIFO read and write rates are 80MHz and so on.

我们可以看到两个FIFO写指针值随每次突发数据包的到达，阶梯式循环增加，并且由于管道2的业务数据速率高于管道1的，故前者的FIFO写指针值单位时钟周期内的增加速度高于后者，并且与两者业务数据速率的比值正相关；另外，两个管道的FIFO读写指针值均在FIFO深度L_FIFO(即1478)内数值循环递增，未发生上下溢出，Pdiff随写指针值的增加而增加，随读指针值的增加而减小，并且能保持在一定范围内有规律变动，由此表明通过调度控制，写入各FIFO的管道业务数据均被及时读出(未发生由于写覆盖导致的输入业务数据丢失)以形成数据基带帧。这是因为每个时钟CLK都检测各管道FIFO中的数据量

i＝1,…,N_PLP当Pdiff不断增加直到

后，数据读取控制装置会选择业务数据量最大的FIFO，

i＝1,…,N_PLP，并从第i'个FIFO中读取

比特数据，进行数据基带帧成帧操作；另外如图9所示的仿真结果可见2个管道的FIFO读状态在一定时钟周期内的时序，EnRd为1或2时，表示在对应的时钟周期内分别执行FIFO2或FIFO1的读操作。在对FIFO的前58次读取操作中，有5次是对管道1的FIFO的读取操作，53次为对管道2的FIFO的读取操作。并且对管道1的FIFO读取操作序号分别为11、22、34、45、57，其余对管道2的FIFO读取操作序号；最后，根据上述FIFO读取操作序号，生成了一个如图10所示的物理帧中承载的信令基带帧(SBBF)和数据基带帧(DBBF)格式。Through the analysis of the simulation results, in the simulation results shown in Figures 7 and 8, the abscissa represents the time change of the FIFO, represented by the number of clocks, and the ordinate represents the pointer read data. Use Pwri to represent the change of the write pointer of the ith FIFO, and Prdi to represent the change of the read pointer of the ith FIFO, because the data structure of the FIFO is a circular linked list, and use Pdiffi to represent the value of the write pointer of the ith FIFO and the value of the read pointer. The result of the difference modulo the FIFO depth, i.e.

We can see that the value of the two FIFO write pointers increases in a stepwise cycle with the arrival of each burst data packet, and since the service data rate of pipeline 2 is higher than that of pipeline 1, the FIFO write pointer value of the former is within the unit clock cycle. The increase rate of the FIFO is higher than that of the latter, and is positively related to the ratio of the two service data rates; in addition, the FIFO read and write pointer values of the two pipelines are cyclically incremented within the FIFO depth L _FIFO (ie, 1478), and there is no upper and lower overflow. , Pdiff increases with the increase of the write pointer value, decreases with the increase of the read pointer value, and can maintain regular changes within a certain range, which indicates that through the scheduling control, the pipeline business data written to each FIFO is timely. Read out (no loss of incoming traffic data due to write overwrite) to form a data baseband frame. This is because each clock CLK detects the amount of data in each pipeline FIFO

i=1,...,N _PLP when Pdiff keeps increasing until

After that, the data reading control device will select the FIFO with the largest amount of business data,

i=1,..., _NPLP and read from the i'th FIFO

Bit data, perform data baseband framing operation; in addition, the simulation results shown in Figure 9 show the timing of the FIFO read status of the two pipes within a certain clock cycle. When EnRd is 1 or 2, it means that it is within the corresponding clock cycle. The read operation of FIFO2 or FIFO1 is performed, respectively. Among the first 58 read operations to the FIFO, there are 5 read operations to the FIFO of pipe 1, and 53 read operations to the FIFO of pipe 2. And the serial numbers of the FIFO read operations for pipeline 1 are 11, 22, 34, 45, and 57, respectively, and the other serial numbers for the FIFO read operations on pipeline 2; Signaling Baseband Frame (SBBF) and Data Baseband Frame (DBBF) formats carried in the physical frame shown.

To sum up, the method and system for scheduling and multiplexing broadcast multi-pipeline service data of the present invention can realize multi-pipeline service data with different rates and different QoS requirements (modulation mode, code rate and code length). , which in turn form baseband frames and map them to a physical frame for transmission. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

The above-mentioned embodiments merely illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed in the present invention should still be covered by the claims of the present invention.

Claims (14)

1. A method for scheduling and multiplexing broadcast multi-pipeline service data, wherein the method for scheduling and multiplexing broadcast multi-pipeline service data comprises: Step S1: Obtain multi-pipeline service data parameters and system parameters, where the multi-pipeline service data parameters include the number of service pipes, the number of coding blocks, and the information bit length of the previous code block used for coding each service pipe data or carried in a physical frame. The total number of information bits before the encoding of the pipeline is determined according to the length of the information bits of the previous code block and the number of encoding blocks used by each service pipeline data to determine the number of pipeline service data bits and the number of data baseband frames carried in each service pipeline data baseband frame. ; Step S2, receiving the data of each service pipeline, and buffering them in the cache of each service pipeline respectively; repeatedly executing the following steps until each service pipeline obtains the number of data baseband frames and the number of data baseband frames: Detecting the data size in each service pipeline cache, and determining a service pipeline whose cached data size is greater than the number of service data bits in the pipeline; Select a service pipe from the service pipes whose cache data size is greater than the number of pipe service data bits, intercept the data of the pipe service data bit number from the cache of the selected service pipe, and encapsulate the intercepted data into a data In the baseband frame, the data baseband frame includes the data baseband frame header information and the intercepted data; The data baseband frame header information includes serial number information of the physical frame to which the data baseband frame belongs and serial number information of the pipeline to which the data baseband frame belongs; Step S3, obtain the multi-pipeline service data parameters and system parameters, form signaling frame load information and encapsulate it into a signaling baseband frame, where the signaling baseband frame includes signaling baseband frame header information and signaling frame load information ; The signaling baseband frame header information includes the sequence number information of the physical frame to which the signaling baseband frame belongs; Step S4, the signaling baseband frame and all the obtained data baseband frames are time-division multiplexed to form a baseband frame sequence that can be carried by one physical frame. 2 . The method for scheduling and multiplexing service data of broadcast multi-pipes according to claim 1 , wherein the service pipe buffer adopts FIFO buffer. 3 . 3. The method for scheduling and multiplexing broadcast multi-pipeline service data according to claim 1, wherein the specific implementation of selecting a service pipe in the service pipe whose cache data size is greater than the number of bits of the pipe service data comprises: The service pipe with the largest cache data size is selected from the service pipes whose data size is greater than the number of bits of the pipe service data. 4. The method for scheduling and multiplexing broadcast multi-pipeline service data according to claim 1, wherein: the signaling baseband frame and all the obtained data baseband frames are time-division multiplexed, and the segmentation can be carried by one physical frame. The specific implementation of the baseband frame sequence includes: encapsulating the data baseband frame into the data area of the physical frame according to the order of the signaling baseband frame preceding the data baseband frame; encapsulating the data baseband frame into the physical frame in the order of generation. data area. 5 . The method for scheduling and multiplexing broadcast multi-pipe service data according to claim 1 , wherein the data baseband frame further includes padding data and/or check data. 6 . 6 . The method for scheduling and multiplexing broadcast multi-pipe service data according to claim 1 , wherein the signaling baseband frame further includes padding data and/or check data. 7 . 7 . The method for scheduling and multiplexing broadcast multi-pipeline service data according to claim 5 , wherein the check data includes CRC check data. 8 . 8. A broadcast multi-pipeline service data scheduling and multiplexing system, wherein the broadcast multi-pipeline service data scheduling and multiplexing system comprises: The service pipeline parameter acquisition module is used to obtain multi-pipeline service data parameters and system parameters. The multi-pipeline service data parameters include the number of service pipes, the number of coding blocks, and the information bit length of the previous code block used for coding each service pipe data or The total number of information bits before the encoding of the pipeline carried in a physical frame; according to the information bit length of the previous code block used for encoding the data of each service pipeline or the total number of information bits before encoding of the pipeline and the number of encoding blocks carried in a physical frame Determine the number of pipeline service data bits and the number of data baseband frames carried in each service pipeline data baseband frame; The service data cache processing module is used to receive the data of each service pipeline and cache it in the cache of each service pipeline; repeatedly execute the following steps until each service pipeline obtains the number of data baseband frames and the number of data baseband frames: detect the data in the cache of each service pipeline determine the service pipeline whose cached data size is greater than the number of bits of the pipeline service data; select a service pipeline from the service pipeline whose cached data size is greater than the number of bits of the pipeline service data, and intercept the described pipeline from the selected service pipeline cache. Pipeline the data of the number of service data bits, and encapsulate the intercepted data into a data baseband frame, where the data baseband frame includes the data baseband frame header information and the intercepted data; the data baseband frame header information includes the The serial number information of the physical frame to which the data baseband frame belongs and the serial number information of the pipeline to which the data baseband frame belongs; The signaling frame generation module is used to obtain the multi-pipeline service data parameters and system parameters, form signaling frame load information and encapsulate it into a signaling baseband frame, and the signaling baseband frame includes the signaling baseband frame header information and Signaling frame load information; the signaling baseband frame header information includes sequence number information of the physical frame to which the signaling baseband frame belongs; The baseband frame multiplexing module is used for time-division multiplexing the signaling baseband frame and all the obtained data baseband frames to form a baseband frame sequence that can be carried by one physical frame. 9. The broadcast multi-pipeline service data scheduling and multiplexing system according to claim 8, wherein the service pipe buffer adopts a FIFO buffer. 10. The broadcast multi-pipeline service data scheduling multiplexing system according to claim 8, wherein the specific implementation of selecting a service pipe in the service pipe whose cache data size is greater than the number of bits of the pipe service data comprises: The service pipe with the largest cache data size is selected from the service pipes whose data size is greater than the number of bits of the pipe service data. 11. The broadcast multi-pipeline service data scheduling multiplexing system according to claim 8, wherein the signaling baseband frame and all the obtained data baseband frames are time-division multiplexed, and the segmentation can be carried by one physical frame. The specific implementation of the baseband frame sequence includes: mapping the signaling baseband frame to the data area of the physical frame in the order of the signaling baseband frame preceding the data baseband frame; mapping the data baseband frame to the The data area of the physical frame. 12 . The system for scheduling and multiplexing broadcast multi-pipe service data according to claim 8 , wherein the data baseband frame further includes padding data and/or check data. 13 . 13 . The system for scheduling and multiplexing broadcast multi-pipe service data according to claim 8 , wherein the signaling baseband frame further includes padding data and/or check data. 14 . 14. The system for scheduling and multiplexing broadcast multi-pipeline service data according to any one of claims 12 to 13, wherein the check data comprises CRC check data.

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