CN116389272B - Broadcast channel statistical multiplexing method and device based on logic channel data volume correction - Google Patents
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- H—ELECTRICITY
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Abstract
The invention discloses a broadcast channel statistical multiplexing method and device based on logic channel data volume correction, and the method comprises the following steps: step P1: setting the time slice length of channel bandwidth statistical multiplexing; step P2: calculating the bandwidth required by each channel of data to be broadcast, and pre-distributing the bandwidth of each channel; step P3: calculating the residual bandwidth of the system, and reallocating the channel bandwidths which are not allocated with the bandwidth according to the priority order until all the channel bandwidths are completely allocated or the residual bandwidth of the system is zero; step P4: according to the bandwidth allocated by each channel, calculating the data quantity which can be sent by each channel according to the time slice length, and finishing data sending according to the calculation result; the device comprises a time slice length setting module, a bandwidth pre-allocation module, a bandwidth reallocation module and a data allocation module. The invention has better adaptivity to the accuracy of channel bandwidth parameter setting, and can solve the problem of low channel use efficiency of the existing statistical multiplexing method.
Description
Technical Field
The invention relates to the technical field of channel statistical multiplexing. In particular to a broadcast channel statistical multiplexing method and device based on logic channel data volume correction.
Background
In a broadcasting system, various types of data are transmitted in parallel, particularly in a weather broadcasting system, broadcasting data are broadcast in a file form, and the time of broadcasting transmission of each data file is in a discrete form. The broadcasting time and the data volume transmission characteristics are different, so that the total transmission bandwidth of a broadcasting system can be fully utilized, and meanwhile, the aging requirements of various types of data transmission are met, and different types of data are generally organized into different logic channels to be broadcast; and the priority, the guaranteed bandwidth and the maximum bandwidth are set for each logic channel, so that each channel obtains the system bandwidth resource to be used for transmitting the channel data between the guaranteed bandwidth and the maximum bandwidth, and the transmission timeliness of various types of data is guaranteed.
The statistical multiplexing bandwidth is carried out according to the channel guaranteed bandwidth, the maximum bandwidth and the priority, and for a broadcasting system with smaller size difference of files of each channel and larger transmission files, the statistical multiplexing bandwidth has better tolerance for setting guaranteed bandwidth parameters and has better system bandwidth utilization rate, for example, patent CN106357560A. However, for a broadcasting system with large variation difference of channel data volume and large quantity of small file channel transmission, the requirement on setting accuracy of parameters such as guaranteed bandwidth is very high, the channel bandwidth calculated according to the universal statistical multiplexing method often appears, but the file to be broadcast at the current moment is small, the bandwidth resource allocated at the current moment cannot be fully utilized, and the overall bandwidth utilization rate of the system is not high.
For example, a certain channel is set to ensure that the bandwidth is 2Mbps, but most of files sent by the channel are 10KB in size, and according to a conventional statistical multiplexing method, the bandwidth allocated by the channel is minimum to ensure that the bandwidth is 2Mbps, so that in the statistical multiplexing period, the channel with 2Mbps only uses 80Kbps, most of the bandwidth is idle and cannot be used by other channels, and system bandwidth resources are wasted. If the guaranteed bandwidth of the channel is reduced to 80Kbps, when a large number of files need to be broadcast in the channel, the channel can not meet the requirement of timely data transmission according to the bandwidth acquired by common bandwidth statistical multiplexing, and the channel is blocked due to low bandwidth and large data volume. Therefore, the existing bandwidth statistical multiplexing method cannot be suitable for broadcast services with large data file size difference and large data volume change, so that the system bandwidth application efficiency is low.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide a broadcast channel statistical multiplexing method and device based on logic channel data volume correction, so as to solve the problem of low system bandwidth utilization rate caused by inaccurate channel guarantee bandwidth and other parameter settings when the channel file size difference is large and the data volume change is large.
In order to solve the technical problems, the invention provides the following technical scheme:
a broadcast channel statistical multiplexing method based on logic channel data volume correction comprises the following steps:
step P1: setting the time slice length of channel bandwidth statistical multiplexing according to the requirement of a broadcasting system, namely carrying out time slice timing, defining the time length T of the channel bandwidth statistical multiplexing, finishing the calculation of the channel bandwidth statistical multiplexing within the time slice length, finishing the data broadcasting within the time slice length according to the allocated bandwidth, and restarting the cycle of each step of the next round after the timing is finished;
step P2: calculating the bandwidth required by each channel of data to be broadcast according to the time slice length, and pre-distributing the bandwidth of each channel; the preassigned bandwidth of each channel is smaller than or equal to the guaranteed bandwidth;
step P3: calculating the residual bandwidth of the system, and carrying out bandwidth redistribution on channels with incomplete bandwidth allocation according to the priority order from high to low until all channel bandwidths are completely allocated or the residual bandwidth of the system is zero; the bandwidth reassigned by each channel is less than or equal to the maximum bandwidth;
step P4: and calculating the data quantity which can be sent by each channel according to the length of the time slice and finishing data sending according to the calculation result according to the bandwidth distributed by each channel.
When the channel bandwidth is calculated by common statistical multiplexing, the channel bandwidth is simultaneously compared with the bandwidth required by the data quantity to be sent by the channel, if the bandwidth allocated by the channel statistical multiplexing is larger than the bandwidth required by the data to be sent at the current moment, the bandwidth of the channel is corrected to the latter, and the rest bandwidth is put back into a bandwidth resource pool for allocation and use by other channels. The method is suitable for bandwidth statistical multiplexing of various broadcasting systems, has high applicability particularly for broadcasting systems with large channel file size difference and large data volume change, can effectively solve the problem of low system bandwidth utilization rate caused by inaccurate channel parameters, particularly guarantee bandwidth setting, and effectively improves the system bandwidth statistical multiplexing efficiency during concurrent broadcasting of small file channels.
The step P2 of the broadcast channel statistical multiplexing method based on logic channel data volume correction includes the following steps:
step P201: counting channels of data to be broadcasted currently, and counting data quantity C to be broadcasted in each channel data Calculating the required bandwidth B required by each channel for broadcasting the current data according to the time slice length T need Only counting the data quantity of channels with data to be broadcasted at the current moment, wherein channels without data to be broadcasted do not participate in bandwidth allocation; demand bandwidth B need The calculation formula of (2) is as follows:
B need ＝C data /T (1)；
step P202: comparing the required bandwidth B of each channel need Bandwidth B is guaranteed min And determining a bandwidth value pre-allocated for each channel.
In the above broadcast channel statistical multiplexing method based on logical channel data volume correction, in step P202:
when the required bandwidth B of a certain channel need The bandwidth B is not more than min When the bandwidth B is required need As the final allocated bandwidth B of the channel chanel The bandwidth allocation of the channel is completed;
when the required bandwidth B of a certain channel need > guaranteed bandwidth B min When the bandwidth B is ensured min Preassigned bandwidth B as the channel pre Is assigned to the channel, which is a channel with incomplete bandwidth allocation.
The step P3 of the broadcast channel statistical multiplexing method based on logic channel data volume correction comprises the following steps:
step P301: correcting the bandwidth calculated by channel bandwidth statistical multiplexing according to the data volume to obtain the residual bandwidth of the system, and arranging channels with incomplete bandwidth allocation according to the order of priority from high to low; the channel with bandwidth allocation completed in the step P2 does not participate in the bandwidth allocation of the channel;
step P302: firstly, carrying out bandwidth statistics multiplexing calculation on channels with incomplete bandwidth allocation in high-priority channels to obtain reallocated bandwidth B of each channel in the priority pre +B cal ；
Step P303: comparing reallocated bandwidth B of channels within the priority pre +B cal Bandwidth of demand B need And maximum bandwidth B max Determining the distribution bandwidth value of each channel in the priority;
step P304: after all the bandwidths of the channels with high priority are allocated, if the residual bandwidth of the system is greater than zero, allocating the channel bandwidths of the secondary priority according to the methods from the step P301 to the step P303 until all the channel bandwidths are allocated or the residual bandwidth of the system is zero.
In the above broadcast channel statistical multiplexing method based on logic channel data volume correction, in step P301, the system residual bandwidth B left The calculation formula of (2) is as follows:
B left ＝B total -∑B chanel_i -∑B pre_i (2)；
in the formula (2), B total Sigma B is the total bandwidth of the system chanel_i Sum of allocated bandwidths for channels with bandwidth allocation completed in step P202, Σb pre_i The sum of the pre-allocated bandwidths occupied by the channels for which bandwidth allocation was not completed in step P202.
In the above broadcast channel statistical multiplexing method based on logic channel data volume correction, in step P302, the maximum bandwidth B of each channel in the priority is calculated max_i The sum of the maximum bandwidths of all channels at this priority Σb max_i The proportion of the total bandwidth is in the system residual bandwidth B left The bandwidth allocation is carried out to obtain theoretical allocation bandwidth B cal Theoretical allocation bandwidth B cal The calculation formula of (2) is as follows:
B cal ＝B left *B max_i /∑B max_i (3)。
in the above-mentioned broadcast channel statistical multiplexing method based on logical channel data volume correction, in step P303:
when the maximum bandwidth B of a certain channel max Equal to or greater than reallocation bandwidth B pre +B cal Not less than the required bandwidth B need When the bandwidth B is required need As the final allocated bandwidth B of the channel chanel The bandwidth allocation of the channel is completed;
reallocating bandwidth B when a channel pre +B cal < required bandwidth B need When bandwidth B is to be reallocated pre +B cal As the final allocated bandwidth B of the channel chanel The bandwidth allocation of the channel is completed;
reallocating bandwidth B when a channel pre +B cal > maximum bandwidth B max When the maximum bandwidth B is to be max As the final allocated bandwidth B of the channel chanel The bandwidth allocation of the channel is completed; will B pre +B cal -B need The residual bandwidth returns to the system residual bandwidth.
In the above broadcast channel statistical multiplexing method based on logic channel data volume correction, in step P4, the data volume C that each channel can send chanel The calculation formula of (2) is as follows:
C chanel ＝B chanel *T (4)；
in the formula (4), C chanel B for the amount of data that each channel can send chanel Finally distributing bandwidth for each channel, wherein T is the set time slice length of channel bandwidth statistical multiplexing;
when data is sent: transmitting data to each channel in the time slice length TMoving to a back-end buffer unit, transmitting data module, dividing the time slice length T into two or more time slots T, and transmitting C in each time slot T chanel Data amount/t. The data allocation and transmission module equally divides all data in the length of the time slice and transmits the data for a plurality of times, so that the data flow transmitted in the T time is as smooth as possible, the data caching pressure of the interface of the back-end equipment is reduced, and the risk of data congestion and loss caused by small cache of the interface of the back-end equipment is reduced.
In the broadcast channel statistical multiplexing method based on logic channel data volume correction, in step P1, the time slice length T is set to 500 ms-5 min, and can also be selected according to the system requirement.
A broadcast channel statistical multiplexing device based on logic channel data volume correction comprises:
the time slice length setting module is used for setting the time slice length of channel bandwidth statistical multiplexing according to the requirement of a broadcasting system;
the bandwidth pre-allocation module is used for calculating the bandwidth required by each channel of the data to be broadcast according to the time slice length and pre-allocating the bandwidth of each channel; the preassigned bandwidth of each channel is smaller than or equal to the guaranteed bandwidth;
the bandwidth reassignment module is used for calculating the residual bandwidth of the system, and carrying out bandwidth assignment on channels which are not subjected to bandwidth assignment according to the priority order from high to low until all channel bandwidths are completely assigned or the residual bandwidth of the system is zero; the bandwidth allocated by each channel is smaller than or equal to the maximum bandwidth;
and the data transmission module is used for calculating the data quantity which can be transmitted by each channel according to the bandwidth allocated by each channel and the time slice length, and completing data transmission according to the calculation result.
The technical scheme of the invention has the following beneficial technical effects:
1. the invention further corrects the channel bandwidth allocation by utilizing the channel data volume based on the existing channel statistical multiplexing algorithm, solves the problem of low bandwidth utilization rate caused by unreasonable channel bandwidth allocation of small file transmission, and improves the bandwidth utilization efficiency of the system and the benefits of the broadcasting system to the greatest extent on the basis of ensuring the data transmission timeliness.
2. The invention has the advantages that the introduced channel data quantity participates in the bandwidth statistical multiplexing calculation, can solve the problem of low channel utilization rate of the existing statistical multiplexing algorithm, simultaneously reduces the accuracy requirement for guaranteeing the bandwidth parameter setting, achieves better statistical multiplexing effect than the existing method, and improves the system channel bandwidth utilization rate.
3. The invention has wide applicability to the system with different transmission file sizes and transmission intervals, effectively reduces the influence of unreasonable channel guarantee bandwidth parameter setting on bandwidth statistic multiplexing efficiency, and reduces the requirement of system parameter setting.
Drawings
Fig. 1 is a schematic flow chart of a broadcast channel statistical multiplexing method based on logic channel data volume correction in an embodiment of the present invention;
FIG. 2 is a schematic flow chart of bandwidth pre-allocation in step P2 in the embodiment of the present invention;
FIG. 3 is a schematic flow chart of bandwidth reassignment in step P3 in an embodiment of the present invention;
fig. 4 is a schematic flow chart of data transmission in step P4 in the embodiment of the present invention.
Detailed Description
In this embodiment, the broadcast channel statistical multiplexing method based on logic channel data volume correction is shown in fig. 1, and includes the following steps:
step P1: setting the time slice length of channel bandwidth statistical multiplexing according to the requirement of a broadcasting system, namely carrying out time slice timing, defining the time length T of the channel bandwidth statistical multiplexing, finishing the calculation of the channel bandwidth statistical multiplexing within the time slice length, finishing the data broadcasting within the time slice length according to the allocated bandwidth, and restarting the cycle of each step of the next round after the timing is finished; the time slice length T is set to 500 milliseconds-5 minutes, and can be selected according to the requirements of the system.
Step P2: calculating the bandwidth required by each channel of data to be broadcast according to the time slice length, and pre-distributing the bandwidth of each channel; the preassigned bandwidth of each channel is smaller than or equal to the guaranteed bandwidth; specifically, the method comprises the following steps:
step P201: counting channels of data to be broadcasted currently, and counting data quantity C to be broadcasted in each channel data Calculating the required bandwidth B required by each channel for broadcasting the current data according to the time slice length T need Only the data quantity of channels with data to be broadcasted at the current moment is counted, and channels without data to be broadcasted do not participate in bandwidth allocation [ as shown in fig. 2, as the logic channel 2 does not have data to be broadcasted, the channels do not participate in bandwidth allocation ]. Demand bandwidth B need The calculation formula of (2) is as follows:
B need ＝C data /T (1)；
step P202: comparing the required bandwidth B of each channel need Bandwidth B is guaranteed min Determining a pre-allocated bandwidth value for each channel: when the required bandwidth B of a certain channel need The bandwidth B is not more than min When the bandwidth B is required need As the final allocated bandwidth B of the channel chanel The bandwidth allocation of the channel is completed; when the required bandwidth B of a certain channel need > guaranteed bandwidth B min When the bandwidth B is ensured min Preassigned bandwidth B as the channel pre Assigned to this channel, which is the channel for which bandwidth allocation is not completed (see fig. 2).
Step P3: calculating the residual bandwidth of the system, and carrying out bandwidth redistribution on channels with incomplete bandwidth allocation according to the priority order from high to low until all channel bandwidths are completely allocated or the residual bandwidth of the system is zero; the bandwidth reassigned by each channel is less than or equal to the maximum bandwidth; specifically, the method comprises the following steps:
step P301: correcting the bandwidth calculated by channel bandwidth statistical multiplexing according to the data volume to obtain the residual bandwidth of the system, and arranging channels with incomplete bandwidth allocation according to the order of priority from high to low; the channel with bandwidth allocation completed in step P2 is no longer involved in this channel bandwidth allocation [ as shown in fig. 3, B chanel_1 And B chanel_n Has completed the allocation and no longer takes part inAnd the bandwidth of the current channel is redistributed; system residual bandwidth B left The calculation formula of (2) is as follows:
B left ＝B total -∑B chanel_i -∑B pre_i (2)；
in the formula (2), B total Sigma B is the total bandwidth of the system chanel_i Sum of allocated bandwidths for channels with bandwidth allocation completed in step P202, Σb pre_i The sum of preassigned bandwidths occupied by channels with unfinished bandwidth allocation in the step P202;
step P302: firstly, carrying out bandwidth statistics multiplexing calculation on channels with incomplete bandwidth allocation in high-priority channels to obtain reallocated bandwidth B of each channel in the priority pre +B cal (the reallocated bandwidth is equal to the preallocated bandwidth B in step P2) pre And theoretical allocation bandwidth B cal Sum of; in the present embodiment, the maximum bandwidth B of each channel in the priority is set max_i The sum of the maximum bandwidths of all channels at this priority Σb max_i The proportion of the total bandwidth is in the system residual bandwidth B left The bandwidth allocation is carried out to obtain theoretical allocation bandwidth B cal Theoretical allocation bandwidth B cal The calculation formula of (2) is as follows:
B cal ＝B left *B max_i /∑B max_i (3)。
step P303: comparing reallocated bandwidth B of channels within the priority pre +B cal Bandwidth of demand B need And maximum bandwidth B max Determining the distribution bandwidth value of each channel in the priority; as shown in fig. 3, in the present embodiment:
when the maximum bandwidth B of a certain channel max Equal to or greater than reallocation bandwidth B pre +B cal Not less than the required bandwidth B need When the bandwidth B is required need As the final allocated bandwidth B of the channel chanel The bandwidth allocation of the channel is completed;
reallocating bandwidth B when a channel pre +B cal < required bandwidth B need When bandwidth B is to be reallocated pre +B cal As the final allocated bandwidth B of the channel chanel The bandwidth allocation of the channel is completed;
reallocating bandwidth B when a channel pre +B cal > maximum bandwidth B max When the maximum bandwidth B is to be max As the final allocated bandwidth B of the channel chanel The bandwidth allocation of the channel is completed; will B pre +B cal -B need The residual bandwidth returns to the system residual bandwidth.
Step P304: after all the bandwidths of the channels with high priority are allocated, if the residual bandwidth of the system is greater than zero, allocating the channel bandwidths of the secondary priority according to the methods from the step P301 to the step P303 until all the channel bandwidths are allocated or the residual bandwidth of the system is zero.
Step P4: as shown in fig. 4, according to the bandwidth allocated to each channel, calculating the data amount which can be transmitted by each channel according to the length of the time slice, and completing data transmission according to the calculation result; data volume C that each channel can send chanel The calculation formula of (2) is as follows:
C chanel ＝B chanel *T (4)；
in the formula (4), C chanel B for the amount of data that each channel can send chanel And finally allocating bandwidth for each channel, wherein T is the set time slice length of channel bandwidth statistical multiplexing. When data is sent: the data which can be transmitted by each channel in the time slice length T is moved to a back-end buffer unit, a data transmission module is used for sub-dividing the time slice length T into two or more time slots T, and C is transmitted in each time slot T chanel Data amount/t. The data allocation and transmission module equally divides all data in the length of the time slice and transmits the data for a plurality of times, so that the data flow transmitted in the T time is as smooth as possible, the data caching pressure of the interface of the back-end equipment is reduced, and the risk of data congestion and loss caused by small cache of the interface of the back-end equipment is reduced.
The broadcast channel statistical multiplexing device based on logic channel data volume correction in the embodiment comprises a time slice length setting module, a bandwidth pre-allocation module, a bandwidth redistribution module and a data transmission module; the time slice length setting module is used for setting the time slice length of channel bandwidth statistical multiplexing according to the requirement of a broadcasting system, and the module specifically executes the instruction of the step P1 in the embodiment; the bandwidth pre-allocation module is used for calculating the bandwidth required by each channel of the data to be broadcast according to the length of the time slice, and pre-allocating the bandwidth for correcting the data quantity of each channel, and the module specifically executes the instruction of the step P2 in the embodiment; the bandwidth reassignment module is used for calculating the residual bandwidth of the system, carrying out bandwidth assignment for correcting the data quantity of channels which are not assigned with bandwidth according to the priority order from high to low until all the channel bandwidths are completely assigned or the residual bandwidth of the system is zero, and specifically executing the instruction of the step P3 of the embodiment; the data sending module is configured to calculate, according to the bandwidth allocated to each channel, the amount of data that can be sent by each channel according to the time slice length, and complete data sending according to the calculation result, where the module specifically executes the instruction of step P4 in this embodiment.
According to the broadcast channel statistical multiplexing method and device based on logic channel data volume correction, whether data files are to be sent in each logic channel or not is counted at regular time, and the current data volume to be sent is counted; calculating a pre-allocation bandwidth value for each channel at regular time according to channel parameters such as channel priority, guaranteed bandwidth, maximum bandwidth and the like, comparing the counted data quantity to be sent of each channel with the current pre-allocation channel bandwidth, and correcting the pre-allocation channel bandwidth according to rules; then organizing data broadcasting according to the corrected channel bandwidth; and then, repeating the process for the next period to continuously broadcast the channel data. The method has better adaptability to the accuracy of channel bandwidth parameter setting, and can effectively solve the problem of low channel use efficiency caused by a common statistical multiplexing bandwidth algorithm when a large number of small file channels are broadcast in parallel. The method of the embodiment can improve the efficiency of channel bandwidth statistical multiplexing and improve the economic benefit of a communication system.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While the obvious variations or modifications which are extended therefrom remain within the scope of the claims of this patent application.
Claims (3)
1. The broadcast channel statistical multiplexing method based on logic channel data volume correction is characterized by comprising the following steps:
step P1: setting the time slice length of channel bandwidth statistical multiplexing according to the broadcasting system requirement;
step P2: calculating the bandwidth required by each channel of data to be broadcast according to the time slice length, and pre-distributing the bandwidth of each channel; the preassigned bandwidth of each channel is smaller than or equal to the guaranteed bandwidth;
step P3: calculating the residual bandwidth of the system, and carrying out bandwidth redistribution on channels with incomplete bandwidth allocation according to the priority order from high to low until all channel bandwidths are completely allocated or the residual bandwidth of the system is zero; the bandwidth reassigned by each channel is less than or equal to the maximum bandwidth;
step P4: according to the bandwidth allocated by each channel, calculating the data quantity which can be sent by each channel according to the time slice length, and finishing data sending according to the calculation result;
step P2 comprises the steps of:
step P201: counting channels of data to be broadcasted currently, and counting data quantity C to be broadcasted in each channel data Calculating the required bandwidth B required by each channel for broadcasting the current data according to the time slice length T need Demand bandwidth B need The calculation formula of (2) is as follows:
B need ＝C data /T (1)；
step P202: comparing the required bandwidth B of each channel need Bandwidth B is guaranteed min Determining a bandwidth value pre-allocated for each channel;
in step P202:
when a certain channelIs of the required bandwidth B of (1) need The bandwidth B is not more than min When the bandwidth B is required need As the final allocated bandwidth B of the channel chanel The bandwidth allocation of the channel is completed;
when the required bandwidth B of a certain channel need > guaranteed bandwidth B min When the bandwidth B is ensured min Preassigned bandwidth B as the channel pre Assigned to the channel, the channel being a channel with incomplete bandwidth allocation;
step P3 comprises the steps of:
step P301: correcting the bandwidth calculated by channel bandwidth statistical multiplexing according to the data volume to obtain the residual bandwidth of the system, and arranging channels with incomplete bandwidth allocation according to the order of priority from high to low;
step P302: firstly, carrying out bandwidth statistics multiplexing calculation on channels with incomplete bandwidth allocation in high-priority channels to obtain reallocated bandwidth B of each channel in the priority pre +B cal ；
Step P303: comparing reallocated bandwidth B of channels within the priority pre +B cal Bandwidth of demand B need And maximum bandwidth B max Determining the distribution bandwidth value of each channel in the priority;
step P304: after all the bandwidths of all the channels with high priority are allocated, if the residual bandwidth of the system is greater than zero, allocating the bandwidths of the channels with the secondary priority according to the methods from the step P301 to the step P303 until all the bandwidths of the channels are allocated or the residual bandwidth of the system is zero;
in step P301, the system residual bandwidth B left The calculation formula of (2) is as follows:
B left ＝B total -∑B chanel_i -∑B pre_i (2)；
in the formula (2), B total Sigma B is the total bandwidth of the system chanel_i Sum of allocated bandwidths for channels with bandwidth allocation completed in step P202, Σb pre_i Summing the pre-allocated bandwidth occupied by the channels for which bandwidth allocation was not completed in step P202；
In step P302, according to the maximum bandwidth B of each channel in the priority max_i The sum of the maximum bandwidths of all channels at this priority Σb max_i The proportion of the total bandwidth is in the system residual bandwidth B left The bandwidth allocation is carried out to obtain theoretical allocation bandwidth B cal Theoretical allocation bandwidth B cal The calculation formula of (2) is as follows:
B cal ＝B left *B max_i /∑B max_i (3)；
in step P303:
when the maximum bandwidth B of a certain channel max Equal to or greater than reallocation bandwidth B pre +B cal Not less than the required bandwidth B need When the bandwidth B is required need As the final allocated bandwidth B of the channel chanel The bandwidth allocation of the channel is completed;
reallocating bandwidth B when a channel pre +B cal < required bandwidth B need When bandwidth B is to be reallocated pre +B cal As the final allocated bandwidth B of the channel chanel The bandwidth allocation of the channel is completed;
reallocating bandwidth B when a channel pre +B cal > maximum bandwidth B max When the maximum bandwidth B is to be max As the final allocated bandwidth B of the channel chanel The bandwidth allocation of the channel is completed;
in step P4, the data amount C that each channel can transmit chanel The calculation formula of (2) is as follows:
C chanel ＝B chanel *T (4)；
in the formula (4), C chanel B for the amount of data that each channel can send chanel Finally distributing bandwidth for each channel, wherein T is the set time slice length of channel bandwidth statistical multiplexing;
when data is sent: the data which can be transmitted by each channel in the time slice length T is moved to a back-end buffer unit, and the data transmission module subdivides the time slice length TFor two or more time slots t, C is transmitted in each t time slot chanel Data amount/t.
2. The broadcasting channel statistical multiplexing method as claimed in claim 1, wherein in the step P1, the time slice length T is set to 500 ms-5 min.
3. A broadcast channel statistical multiplexing device based on logical channel data volume correction, comprising:
the time slice length setting module is used for setting the time slice length of channel bandwidth statistical multiplexing according to the requirement of a broadcasting system; the module specifically executes the instruction of the step P1 in the broadcast channel statistical multiplexing method based on logic channel data volume correction as claimed in claim 1;
the bandwidth pre-allocation module is used for calculating the bandwidth required by each channel of the data to be broadcast according to the time slice length and pre-allocating the bandwidth of each channel; the preassigned bandwidth of each channel is smaller than or equal to the guaranteed bandwidth; the module specifically executes the instruction of the step P2 in the broadcast channel statistical multiplexing method based on logic channel data volume correction as claimed in claim 1;
the bandwidth reassignment module is used for calculating the residual bandwidth of the system, and carrying out bandwidth assignment on channels which are not subjected to bandwidth assignment according to the priority order from high to low until all channel bandwidths are completely assigned or the residual bandwidth of the system is zero; the bandwidth allocated by each channel is smaller than or equal to the maximum bandwidth; the module specifically executes the instruction of the step P3 in the broadcast channel statistical multiplexing method based on logic channel data volume correction according to claim 1;
the data transmission module is used for calculating the data quantity which can be transmitted by each channel according to the bandwidth allocated by each channel and the length of the time slice, and completing data transmission according to the calculation result; the module specifically executes the instruction of step P4 in the broadcast channel statistical multiplexing method based on the correction of the data volume of the logical channel according to claim 1.
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