CN112822118B - Method and device for determining data transmission frame length of satellite and communication system - Google Patents
Method and device for determining data transmission frame length of satellite and communication system Download PDFInfo
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- CN112822118B CN112822118B CN202011621880.6A CN202011621880A CN112822118B CN 112822118 B CN112822118 B CN 112822118B CN 202011621880 A CN202011621880 A CN 202011621880A CN 112822118 B CN112822118 B CN 112822118B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/36—Flow control; Congestion control by determining packet size, e.g. maximum transfer unit [MTU]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/36—Flow control; Congestion control by determining packet size, e.g. maximum transfer unit [MTU]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
In the embodiment of the invention, the channel utilization rate is determined, and the minimum length of the length of a data transmission frame is determined based on the determined channel utilization rate; determining the maximum length of a data transmission frame length, and determining the optimal length of the data transmission frame length based on the maximum length of the data transmission frame length and the minimum length of the data transmission frame length; the optimal length of the data transmission frame length is used for maximizing the frequency utilization rate of data transmission. Therefore, the method can accurately and reasonably calculate the value range of the data transmission frame length of the high-throughput satellite, determine the optimal value of the data transmission frame length based on the optimal spectrum utilization rate, prolong the data transmission frame length as far as possible under the condition of inhibiting the system error rate, reduce the protection interval and increase the spectrum utilization rate.
Description
Technical Field
The present invention relates to the field of signal processing technologies, and in particular, to a method, an apparatus, and a communication system for determining a data transmission frame length of a satellite.
Background
Along with the expansion of urban areas, newly-built substations are located in remote areas, most of the areas do not cover operator networks, and meanwhile, the newly-built substations are not communicated with power grid internal networks, so that newly-built equipment cannot be communicated with a power grid master station for debugging. Therefore, a return path is generally required to be provided through the satellite, and the debugging data is returned to the main power grid station.
However, the conventional satellite communication method has low throughput, high packet loss rate and poor stability, and cannot provide a stable large-bandwidth communication channel for debugging equipment in a transformer substation, so that a satellite communication method meeting the power communication reliability and large bandwidth is urgently needed. The high-throughput communication satellite, also called a high-throughput communication satellite, can provide a capacity which is several times or even tens of times higher than that of a conventional communication satellite, and provides a communication mode with large bandwidth and wide coverage for a remote substation area.
However, the existing data transmission technology of the high-throughput communication satellite cannot determine the range of the data transmission frame length, for example, determine the minimum value of the data transmission frame length, so that the frequency utilization rate is low, and the efficiency of data transmission is seriously affected.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method, a device and a communication system for determining the data transmission frame length of a satellite, which can accurately and reasonably calculate the value range of the data transmission frame length of a high-flux satellite, determine the optimal value of the data transmission frame length based on the optimal spectrum utilization rate, prolong the data transmission frame length as much as possible under the condition of inhibiting the system error rate, reduce the protection interval and increase the spectrum utilization rate.
In order to solve the above technical problem, a first aspect of the present invention discloses a method for determining a data transmission frame length of a satellite, where the method includes:
determining the channel utilization rate, and determining the minimum length of the length of a data transmission frame based on the determined channel utilization rate;
determining the maximum length of a data transmission frame length, and determining the optimal length of the data transmission frame length based on the maximum length of the data transmission frame length and the minimum length of the data transmission frame length; the optimal length of the data transmission frame length is used for maximizing the frequency utilization rate of data transmission.
As an optional implementation manner, in the first aspect of the present invention, the determining a channel utilization rate, and determining a minimum length of a data transmission frame length based on the determined channel utilization rate includes:
determining an optimal value of the channel utilization rate based on the relation between the channel utilization rate and the use effect of the communication port;
determining a calculation formula of the channel utilization rate, and converting the calculation formula of the channel utilization rate according to the optimal value of the channel utilization rate to obtain a bit error rate relation of the channel utilization rate;
and determining the minimum length of the data transmission frame length according to the bit error rate relation of the channel utilization rate.
As an optional implementation manner, in the first aspect of the present invention, the determining an optimal value of the channel utilization based on a relationship between the channel utilization and a usage effect of a communication port includes:
determining the relationship between the channel utilization rate and the use effect of the communication port as follows:
the channel utilization rate is inversely proportional to the using effect of the communication port, when the channel utilization rate is higher, the using effect of the communication port is worse, and when the channel utilization rate is lower, the using effect of the high-throughput satellite communication system is worse;
and determining the optimal value of the channel utilization rate to be 50% based on the relation between the channel utilization rate and the use effect of the communication port.
As an optional implementation manner, in the first aspect of the present invention, the determining a calculation formula of channel utilization rate, and converting the calculation formula of channel utilization rate according to the optimal value of channel utilization rate to obtain a bit error rate relationship of channel utilization rate includes:
the calculation formula for determining the channel utilization is as follows:
wherein: x represents an approximate value of the channel utilization rate required to be set; β represents a channel compensation factor with different characteristics, and for convenience of calculation, let β =1; l is a radical of an alcohol f Indicating the length of a data transmission frame; d f Indicating the length of the frame header; w is a f Representing the bit error rate of the channel; f represents a port of the high-throughput satellite communication system;
based on that the optimal value of the channel utilization rate is 50%, converting the calculation formula of the channel utilization rate to obtain a bit error rate relationship of the channel utilization rate as follows:
as an optional implementation manner, in the first aspect of the present invention, the determining the minimum length of the data transmission frame length according to the bit error rate relationship of the channel utilization includes:
determining the proportion of the frame header length to the data transmission frame length as a preset empirical proportion value, and determining the trend relation of the error rate changing along with the frame length according to the bit error rate relation of the channel utilization rate and the proportion of the frame header length to the data transmission frame length;
and determining a sensitivity change boundary value in the trend relation of the error rate along with the change of the frame length, and determining the data transmission frame length corresponding to the sensitivity change boundary value as the minimum length of the data transmission frame length.
As an optional implementation manner, in the first aspect of the present invention, the determining the maximum length of the data transmission frame length, and based on the maximum length of the data transmission frame length and the minimum length of the data transmission frame length, determining the optimal length of the data transmission frame length includes:
determining the relationship between the channel utilization rate and the transmission time as follows: channel utilization = data transmission frame length/(data transmission frame length + channel idle time);
determining the maximum length of the length of a data transmission frame based on the relation between the channel utilization rate and the sending time and the optimal value of the channel utilization rate;
determining the relationship between the frequency utilization rate and the length of the data transmission frame as follows: when the data transmission frame is longer, the guard interval is less, the more information can be transmitted, and the higher the frequency spectrum utilization rate of the same width is;
and determining the maximum length of the data transmission frame length as the optimal length of the data transmission frame length according to the relationship between the frequency utilization rate and the data transmission frame length.
A second aspect of the present invention discloses an apparatus for determining a data transmission frame length of a satellite, where the apparatus includes:
the first determining module is used for determining the utilization rate of a channel and determining the minimum length of the length of a data transmission frame based on the determined utilization rate of the channel;
a second determining module, configured to determine a maximum length of a data transmission frame length, and determine an optimal length of the data transmission frame length based on the maximum length of the data transmission frame length and a minimum length of the data transmission frame length; the optimal length of the data transmission frame length is used for maximizing the frequency utilization rate of data transmission.
As an optional implementation manner, in the second aspect of the present invention, a specific manner in which the first determining module determines a channel utilization rate and determines the minimum length of a data transmission frame length based on the determined channel utilization rate includes:
determining an optimal value of the channel utilization rate based on the relation between the channel utilization rate and the use effect of the communication port;
determining a calculation formula of the channel utilization rate, and converting the calculation formula of the channel utilization rate according to the optimal value of the channel utilization rate to obtain a bit error rate relation of the channel utilization rate;
and determining the minimum length of the data transmission frame according to the bit error rate relation of the channel utilization rate.
As an optional implementation manner, in the second aspect of the present invention, a specific manner of determining the optimal value of the channel utilization by the first determining module based on a relationship between the channel utilization and a usage effect of a communication port includes:
determining the relationship between the channel utilization rate and the use effect of the communication port as follows:
the channel utilization rate is inversely proportional to the using effect of the communication port, when the channel utilization rate is higher, the using effect of the communication port is worse, and when the channel utilization rate is lower, the using effect of the high-throughput satellite communication system is worse;
and determining the optimal value of the channel utilization rate to be 50% based on the relation between the channel utilization rate and the use effect of the communication port.
As an optional implementation manner, in the second aspect of the present invention, a specific manner in which the first determining module determines a calculation formula of the channel utilization rate, and converts the calculation formula of the channel utilization rate according to the optimal value of the channel utilization rate to obtain a bit error rate relationship of the channel utilization rate includes:
the calculation formula for determining the channel utilization is as follows:
wherein: x represents an approximate value of the channel utilization rate required to be set; β represents channel compensation factors of different characteristics, and for convenience of calculation, let β =1; l is a radical of an alcohol f The length of a data transmission frame is represented; d f Representing the length of the frame header; w is a f Representing the bit error rate of the channel; f represents a port of the high-throughput satellite communication system;
based on that the optimal value of the channel utilization rate is 50%, converting the calculation formula of the channel utilization rate to obtain a bit error rate relationship of the channel utilization rate as follows:
as an optional implementation manner, in the second aspect of the present invention, a specific manner that the first determining module determines the minimum length of the data transmission frame length according to the bit error rate relationship of the channel utilization ratio includes:
determining the proportion of the frame header length to the data transmission frame length as a preset empirical proportion value, and determining the trend relation of the error rate changing along with the frame length according to the bit error rate relation of the channel utilization rate and the proportion of the frame header length to the data transmission frame length;
and determining a sensitivity change boundary value in the trend relation of the error rate along with the change of the frame length, and determining the data transmission frame length corresponding to the sensitivity change boundary value as the minimum length of the data transmission frame length.
As an optional implementation manner, in the second aspect of the present invention, the specific manner of determining the maximum length of the data transmission frame length by the second determining module and determining the optimal length of the data transmission frame length based on the maximum length of the data transmission frame length and the minimum length of the data transmission frame length includes:
determining the relationship between the channel utilization rate and the sending time as follows: channel utilization = data transmission frame length/(data transmission frame length + channel idle time);
determining the maximum length of the data transmission frame length based on the relation between the channel utilization rate and the sending time and the optimal value of the channel utilization rate;
determining the relationship between the frequency utilization rate and the length of the data transmission frame as follows: when the data transmission frame is longer, the guard interval is less, the more information can be transmitted, and the higher the frequency spectrum utilization ratio of the same width is;
and determining the maximum length of the data transmission frame length as the optimal length of the data transmission frame length according to the relationship between the frequency utilization rate and the data transmission frame length.
The third aspect of the present invention discloses another apparatus for determining a data transmission frame length of a satellite, including:
a memory storing executable program code;
a processor coupled with the memory;
the processor calls the executable program code stored in the memory to execute part or all of the steps of the method for determining the data transmission frame length of the satellite disclosed by the first aspect of the embodiment of the invention.
A fourth aspect of the present invention discloses a computer storage medium, where a computer instruction is stored, and when the computer instruction is called, the computer instruction is used to execute part or all of the steps in the method for determining a data transmission frame length of a satellite disclosed in the first aspect of the present invention.
The fifth aspect of the embodiment of the invention discloses a system for determining the length of a data transmission frame of a satellite, which comprises a data transmission module; the data transmission module is configured to perform part or all of the steps of the method for determining the data transmission frame length of the satellite disclosed in the first aspect of the embodiment of the present invention.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, the channel utilization rate is determined, and the minimum length of the length of a data transmission frame is determined based on the determined channel utilization rate; determining the maximum length of a data transmission frame length, and determining the optimal length of the data transmission frame length based on the maximum length of the data transmission frame length and the minimum length of the data transmission frame length; the optimal length of the data transmission frame length is used for maximizing the frequency utilization rate of data transmission. Therefore, the method can accurately and reasonably calculate the value range of the data transmission frame length of the high-flux satellite, determine the optimal value of the data transmission frame length based on the optimal spectrum utilization rate, prolong the data transmission frame length as far as possible under the condition of inhibiting the system error rate, reduce the protection interval and increase the spectrum utilization rate.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for determining a data transmission frame length of a satellite according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a satellite data transmission frame length determining apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a data transmission frame length determining apparatus for another satellite according to an embodiment of the present invention;
fig. 4 is a distribution trend graph of the bit error rate varying with the frame length according to the embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," and the like in the description and claims of the present invention and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, apparatus, article, or article that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or article.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The invention discloses a method, a device and a communication system for determining the length of a data transmission frame of a satellite, which can accurately and reasonably calculate the value range of the length of the data transmission frame of a high-throughput satellite, determine the optimal value of the length of the data transmission frame based on the optimal spectrum utilization rate, prolong the length of the data transmission frame as far as possible under the condition of inhibiting the system error rate, reduce the protection interval and increase the spectrum utilization rate. The following are detailed descriptions.
Example one
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for determining a data transmission frame length of a satellite according to an embodiment of the present invention. As shown in fig. 1, the method for determining the data transmission frame length of the satellite may include the following operations:
101. and determining the channel utilization rate, and determining the minimum length of the data transmission frame based on the determined channel utilization rate.
102. And determining the maximum length of the data transmission frame length, and determining the optimal length of the data transmission frame length based on the maximum length of the data transmission frame length and the minimum length of the data transmission frame length.
Specifically, the optimal length of the data transmission frame length is used to maximize the frequency utilization rate of data transmission.
Therefore, by implementing the embodiment of the invention, the data transmission frame length value range of the high-flux satellite can be accurately and reasonably calculated, and the optimal data transmission frame length value is determined based on the optimal spectrum utilization rate, so that the data transmission frame length can be prolonged as much as possible under the condition of inhibiting the system error rate, the guard interval is reduced, and the spectrum utilization rate is increased.
As an alternative embodiment, in step 101, determining a channel utilization rate, and determining a minimum length of a data transmission frame length based on the determined channel utilization rate includes:
and determining the optimal value of the channel utilization rate based on the relation between the channel utilization rate and the use effect of the communication port.
And determining a calculation formula of the channel utilization rate, and converting the calculation formula of the channel utilization rate according to the optimal value of the channel utilization rate to obtain the bit error rate relation of the channel utilization rate.
And determining the minimum length of the data transmission frame length according to the bit error rate relation of the channel utilization rate.
Specifically, determining the optimal value of the channel utilization rate based on the relationship between the channel utilization rate and the usage effect of the communication port includes:
determining the relationship between the channel utilization rate and the use effect of the communication port as follows:
the channel utilization rate is inversely proportional to the usage effect of the communication port, and the usage effect of the communication port is worse when the channel utilization rate is higher, and the usage effect of the high-throughput satellite communication system is worse when the channel utilization rate is lower.
Based on the relationship between the channel utilization and the usage effect of the communication port, the optimal value of the channel utilization is determined to be 50%.
Specifically, the channel utilization rate is set as X, because the channel utilization rate is inversely proportional to the port use effect, the higher the value of X is, the more the port feels that the communication system is stuck; when the value of X is low, the functionality of the high-throughput satellite communication system is wasted. The channel utilization is thus controlled at 50%, i.e. let X =50%.
As an alternative embodiment, determining a calculation formula of the channel utilization rate, and converting the calculation formula of the channel utilization rate according to the optimal value of the channel utilization rate to obtain a bit error rate relationship of the channel utilization rate includes:
the calculation formula for determining the channel utilization rate is as follows:
wherein: x represents an approximation of the channel utilization that needs to be set. β denotes a channel compensation factor of different characteristics, and for convenience of calculation, β =1 is assumed here. L is f Indicating the data transmission frame length. D f Indicating the frame header length. w is a f Representing the bit error rate of the channel. f denotes a port of the high throughput satellite communication system.
Based on the optimal value of the channel utilization rate being 50%, converting a calculation formula of the channel utilization rate to obtain a bit error rate relationship of the channel utilization rate as follows:
specifically, known high-throughput satellite communication systems utilize the Kronecker product to rearrange high-throughput communication signals, and assume the guard interval between different data to be J n . Assuming that the system bandwidth utilization rate during continuous output is θ, the actual utilization rate calculation result is:
in equation (1): theta' represents the actual utilization rate of the system bandwidth; n represents parallel sub-data streams; k represents a spreading factor; m represents the number of data transmitted at one time on each sub-carrier. The service environment of the high-throughput satellite communication system is not completely stable, and some burst noise or fluctuation noise can cause data frame transmission errors. Therefore, interleaving of high throughput satellite communication systems is required to prevent noise from limiting the transmitted signal at the data link layer using different channels. According to the basic concept of the channel utilization rate, the problems of data transmission and processing delay, protocol overhead and the like of the channel are not considered, and for a point-to-point data link layer, the channel utilization rate is controlled to be close to the following calculation result:
in equation (2): x represents an approximate value of the channel utilization rate required to be set; β represents channel compensation factors of different characteristics, and for convenience of calculation, let β =1; l is f Representing the frame length; d f Indicating the length of the frame header; w is a f Representing the bit error rate of the channel; f denotes a port of the high throughput satellite communication system. According to the formula (2), when D is reached f And w f For a given time, the channel utilization can be controlled around a maximum limit by using an appropriate frame length. But because the channel utilization rate is inversely proportional to the port use effect, the higher the value of X is, the more the port feels that the communication system is stuck; when the value of X is low, the functionality of the high-throughput satellite communication system is wasted. According to the channel utilization rate is thus controlled at 50%, i.e. let X =50%, the bit error rate of the channel can be adjusted to be:
as an alternative embodiment, determining the minimum length of the data transmission frame length according to the bit error rate relationship of the channel utilization includes:
and determining the proportion of the frame header length to the data transmission frame length as a preset empirical proportion value, and determining the trend relation of the error rate changing along with the frame length according to the bit error rate relation of the channel utilization rate and the proportion of the frame header length to the data transmission frame length.
And determining a sensitivity change boundary value in the trend relation of the error rate along with the frame length change, and determining the data transmission frame length corresponding to the sensitivity change boundary value as the minimum length of the data transmission frame length.
Specifically, the ratio of two parameters, i.e., the frame header length and the frame length, is adjusted to 10% and 20% according to the ratio of smaller value 10% obtained by experience and larger value 20% obtained by experience, and the relationship between the frame length and the error rate, i.e., the distribution trend graph of the error rate along with the change of the frame length, is the result shown in fig. 4.
According to fig. 4, even though the ratio of the frame header to the frame length is different, the variation trend is very similar in the interval of reasonably large value and small value: (1) when the absolute length of the frame length is longer, the error rate is lower; (2) when the absolute length of the frame length is less than a certain byte (here, when the frame length is based on the channel error rate, the sensitivity change boundary value is that the frame length takes 6 bits), the change sensitivity of the error rate becomes gradually higher, the absolute length of the frame length is less than a certain byte, the change sensitivity of the error rate starts to become smaller, and the change trend is gentle.
Because the error rate changes smoothly when the frame length is less than the frame length corresponding to the sensitivity change boundary value, the minimum value of the frame length can be set as Lf corresponding to the frame length of the sensitivity change boundary value min I.e. the minimum length of a data transmission frame length.
As an alternative embodiment, determining the maximum length of the data transmission frame length, and based on the maximum length of the data transmission frame length and the minimum length of the data transmission frame length, determining the optimal length of the data transmission frame length includes:
determining the relationship between the channel utilization rate and the sending time as follows: channel utilization = data transmission frame length/(data transmission frame length + channel idle time).
And determining the maximum length of the data transmission frame based on the relation between the channel utilization rate and the sending time and the optimal value of the channel utilization rate.
Determining the relationship between the frequency utilization rate and the length of the data transmission frame as follows: when the data transmission frame length is longer, the guard interval is less, the more information can be transmitted, and the higher the frequency spectrum utilization rate of the same width is.
And determining the maximum length of the data transmission frame length as the optimal length of the data transmission frame length according to the relationship between the frequency utilization rate and the data transmission frame length.
Specifically, since the channel utilization = time of transmission frame/(time of transmission frame + channel idle time), since the transmission cycle is generally fixed, when the channel utilization is fixed, the transmission time is fixed.
The transmission frame needs to satisfy a certain number of lengths to satisfy the fixed transmission time.
Once a transmission frame can only take a certain number of lengths, i.e. the maximum length that is desirable for a transmission frame is fixed.
In summary, when the channel utilization is fixed, the length of the transmission frame is less than a specific value Lf max I.e. determining the maximum length of the data transmission frame.
Further, in the value range Lf min ≤Lf≤Lf max And determining the frame length to maximize the frequency spectrum utilization rate. When the frame length is longer, the guard interval is less, so that more information can be transmitted, and the utilization rate of the frequency spectrum with the same width is higher. Therefore, when the frame length is Lf = Lf max When the frequency spectrum is used, the frequency spectrum utilization rate is highest.
Example two
Referring to fig. 2, fig. 2 is a schematic structural diagram of a satellite data transmission frame length determining apparatus according to an embodiment of the present invention. As shown in fig. 2, the apparatus may include:
a first determining module 201, configured to determine a channel utilization rate, and determine a minimum length of a data transmission frame length based on the determined channel utilization rate.
The second determining module 202 is configured to determine a maximum length of a data transmission frame, and determine an optimal length of the data transmission frame based on the maximum length of the data transmission frame and a minimum length of the data transmission frame.
Specifically, the optimal length of the data transmission frame length is used to maximize the frequency utilization rate of data transmission.
Therefore, by implementing the embodiment of the invention, the data transmission frame length value range of the high-flux satellite can be accurately and reasonably calculated, and the optimal data transmission frame length value is determined based on the optimal spectrum utilization rate, so that the data transmission frame length can be prolonged as much as possible under the condition of inhibiting the system error rate, the guard interval is reduced, and the spectrum utilization rate is increased.
As an alternative embodiment, the first determining module 201 determines the channel utilization rate, and a specific manner of determining the minimum length of the data transmission frame length based on the determined channel utilization rate includes:
and determining the optimal value of the channel utilization rate based on the relation between the channel utilization rate and the use effect of the communication port.
And determining a calculation formula of the channel utilization rate, and converting the calculation formula of the channel utilization rate according to the optimal value of the channel utilization rate to obtain the bit error rate relation of the channel utilization rate.
And determining the minimum length of the data transmission frame length according to the bit error rate relation of the channel utilization rate.
Specifically, the first determining module 201 determines a specific manner of the optimal value of the channel utilization rate based on the relationship between the channel utilization rate and the usage effect of the communication port, including:
determining the relationship between the channel utilization rate and the use effect of the communication port as follows:
the channel utilization rate is inversely proportional to the usage effect of the communication port, and the usage effect of the communication port is worse when the channel utilization rate is higher, and the usage effect of the high-throughput satellite communication system is worse when the channel utilization rate is lower.
Based on the relationship between the channel utilization and the usage effect of the communication port, the optimal value of the channel utilization is determined to be 50%.
Specifically, the channel utilization rate is set as X, because the channel utilization rate is inversely proportional to the port use effect, the higher the value of X is, the more the port feels that the communication system is stuck; when the value of X is low, the functionality of the high-throughput satellite communication system is wasted. The channel utilization is thus controlled at 50%, i.e. let X =50%.
As an alternative embodiment, the specific manner in which the first determining module 201 determines a calculation formula of the channel utilization rate, and converts the calculation formula of the channel utilization rate according to the optimal value of the channel utilization rate to obtain the bit error rate relationship of the channel utilization rate includes:
the calculation formula for determining the channel utilization is as follows:
wherein: x represents an approximation of the channel utilization that needs to be set. β denotes a channel compensation factor of different characteristics, and for convenience of calculation, β =1 is assumed here. L is f Indicating the data transmission frame length. D f Indicating the frame header length. w is a f Representing the bit error rate of the channel. f denotes a port of the high throughput satellite communication system.
Based on the optimal value of the channel utilization rate being 50%, converting a calculation formula of the channel utilization rate to obtain a bit error rate relationship of the channel utilization rate as follows:
specifically, known high-throughput satellite communication systems utilize the Kronecker product to rearrange the high-throughput communication signals, setting the guard interval between different data to J n . Assuming that the system bandwidth utilization rate during continuous output is θ, the actual utilization rate calculation result is:
in equation (1): theta' represents the actual utilization rate of the system bandwidth; n represents parallel sub-data streams; k represents a spreading factor; m represents the number of data transmitted at one time on each sub-carrier. The service environment of the high-throughput satellite communication system is not completely stable, and some burst noise or fluctuation noise can cause data frame transmission errors. Therefore, interleaving of the high-throughput satellite communication system is required, and different channels are utilized at a data link layer to prevent noise from limiting transmission signals. According to the basic concept of the channel utilization rate, the problems of data transmission and processing delay, protocol overhead and the like of the channel are not considered, and for a point-to-point data link layer, the channel utilization rate is controlled to be close to the following calculation result:
in equation (2): x represents an approximate value of the channel utilization rate required to be set; β represents a channel compensation factor with different characteristics, and for convenience of calculation, let β =1; l is f Representing the frame length; d f Indicating the length of the frame header; w is a f Representing the bit error rate of the channel; f denotes a port of the high throughput satellite communication system. According to the formula (2), when D f And w f For a given time, the channel utilization can be controlled around a maximum limit by using an appropriate frame length. But because the channel utilization rate is inversely proportional to the port use effect, the higher the value of X is, the more the port feels that the communication system is stuck; when the value of X is low, the functionality of the high-throughput satellite communication system is wasted. According to the channel utilization rate is thus controlled at 50%, i.e. let X =50%, the bit error rate of the channel can be adjusted to be:
as an alternative embodiment, the specific manner for determining the minimum length of the data transmission frame length by the first determining module 201 according to the bit error rate relationship of the channel utilization rate includes:
and determining the proportion of the frame header length to the data transmission frame length as a preset empirical proportion value, and determining the trend relation of the error rate changing along with the frame length according to the bit error rate relation of the channel utilization rate and the proportion of the frame header length to the data transmission frame length.
And determining a sensitivity change boundary value in the trend relation of the error rate along with the frame length change, and determining the data transmission frame length corresponding to the sensitivity change boundary value as the minimum length of the data transmission frame length.
Specifically, the ratio of two parameters, i.e., the frame header length and the frame length, is adjusted to 10% and 20% by taking the ratio of the smaller value to 10% according to experience and the ratio of the larger value to 20% according to experience, so that the relationship between the frame length and the error rate, i.e., the distribution trend graph of the error rate varying with the frame length, is the result shown in fig. 4.
According to fig. 4, even though the ratio of the frame header to the frame length is different, the variation trend is very similar in the interval of reasonably large value and small value: (1) when the absolute length of the frame length is longer, the error rate is lower; (2) when the absolute length of the frame length is less than a certain byte (here, when the frame length is 50% based on the channel error rate, the sensitivity change boundary value is that the frame length is 6 bits), the change sensitivity of the error rate becomes gradually higher, the absolute length of the frame length is less than a certain byte, the change sensitivity of the error rate starts to become smaller, and the change trend is gentle.
When the frame length is less than the frame length corresponding to the sensitivity variation boundary value, the error rate varies smoothly, so that the minimum value of the frame length may be set as Lf min I.e. the minimum length of a data transmission frame length.
As an alternative embodiment, the determining, by the second determining module 202, the maximum length of the data transmission frame length, and based on the maximum length of the data transmission frame length and the minimum length of the data transmission frame length, a specific manner of determining the optimal length of the data transmission frame length includes:
determining the relationship between the channel utilization rate and the sending time as follows: channel utilization = data transmission frame length/(data transmission frame length + channel idle time).
And determining the maximum length of the data transmission frame length based on the relation between the channel utilization rate and the sending time and the optimal value of the channel utilization rate.
Determining the relationship between the frequency utilization rate and the length of the data transmission frame as follows: when the data transmission frame length is longer, the guard interval is less, the more information can be transmitted, and the higher the frequency spectrum utilization rate of the same width is.
And determining the maximum length of the data transmission frame length as the optimal length of the data transmission frame length according to the relationship between the frequency utilization rate and the data transmission frame length.
Specifically, since the channel utilization = time of transmission frame/(time of transmission frame + channel idle time), since the transmission cycle is generally fixed, when the channel utilization is fixed, the transmission time is fixed.
The transmission frame needs to satisfy a certain number of lengths to satisfy the fixed transmission time.
Once a transmission frame can only take a certain number of lengths, the maximum length of the transmission frame is fixed.
In summary, when the channel utilization is fixed, the length of the transmission frame is less than a specific value Lf max I.e. determining the maximum length of the data transmission frame.
Further, in the value range Lf min ≤Lf≤Lf max And determining the frame length to maximize the utilization rate of the frequency spectrum. When the frame length is longer, the guard interval is less, so that more information can be transmitted, and the utilization rate of the frequency spectrum with the same width is higher. Therefore, when the frame length is Lf = Lf max When the frequency spectrum is used, the frequency spectrum utilization rate is highest.
EXAMPLE III
Referring to fig. 3, fig. 3 is a schematic structural diagram of a data transmission frame length determining apparatus for a satellite according to another embodiment of the present invention. As shown in fig. 3, the apparatus may include:
a memory 301 storing executable program code;
a processor 302 coupled to the memory 301;
the processor 302 calls the executable program code stored in the memory 301 to execute part or all of the steps in the method for determining the data transmission frame length of the satellite according to the embodiment of the present invention.
Example four
The embodiment of the invention discloses a computer storage medium, which stores computer instructions, and when the computer instructions are called, the computer instructions are used for executing part or all of the steps of the method for determining the length of the data transmission frame of the satellite disclosed by the embodiment of the invention.
EXAMPLE five
The embodiment of the invention discloses a system for determining the length of a data transmission frame of a satellite. The data transmission module is used for executing part or all of the steps of the method for determining the data transmission frame length of the satellite disclosed by the embodiment of the invention.
The above-described embodiments of the apparatus are merely illustrative, and the modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above detailed description of the embodiments, those skilled in the art will clearly understand that the embodiments may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. Based on such understanding, the above technical solutions may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, wherein the storage medium includes a Read-Only Memory (ROM), a Random Access Memory (RAM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), a One-time Programmable Read-Only Memory (OTPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc-Read-Only Memory (CD-ROM) or other Memory capable of storing data, a magnetic tape, or any other computer-readable medium capable of storing data.
Finally, it should be noted that: the method, the apparatus and the communication system for determining the data transmission frame length of the satellite disclosed in the embodiments of the present invention are only preferred embodiments of the present invention, and are only used for illustrating the technical solutions of the present invention, not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art; the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A method for determining a data transmission frame length of a satellite, the method comprising:
determining the channel utilization rate, and determining the minimum length of the length of a data transmission frame based on the determined channel utilization rate;
determining the maximum length of a data transmission frame length, and determining the optimal length of the data transmission frame length based on the maximum length of the data transmission frame length and the minimum length of the data transmission frame length; the optimal length of the data transmission frame length is used for enabling the frequency utilization rate of data transmission to be the highest;
the determining the channel utilization rate and the determining the minimum length of the data transmission frame length based on the determined channel utilization rate include:
determining an optimal value of the channel utilization rate based on the relation between the channel utilization rate and the use effect of the communication port;
determining a calculation formula of the channel utilization rate, and converting the calculation formula of the channel utilization rate according to the optimal value of the channel utilization rate to obtain a bit error rate relation of the channel utilization rate;
determining the minimum length of the length of a data transmission frame according to the bit error rate relation of the channel utilization rate;
wherein, the calculation formula of the channel utilization rate is as follows:
wherein: x represents an approximate value of the channel utilization rate required to be set; beta represents channel compensation factors with different characteristics; l is f Indicating the length of a data transmission frame; d f Representing the length of the frame header; w is a f Representing the bit error rate of the channel; f denotes a port of the high throughput satellite communication system.
2. The method for determining the data transmission frame length of the satellite according to claim 1, wherein the determining the optimal value of the channel utilization rate based on the relationship between the channel utilization rate and the usage effect of the communication port comprises:
determining the relationship between the channel utilization rate and the use effect of the communication port as follows:
the channel utilization rate is inversely proportional to the using effect of the communication port, when the channel utilization rate is higher, the using effect of the communication port is worse, and when the channel utilization rate is lower, the using effect of the high-throughput satellite communication system is worse;
and determining the optimal value of the channel utilization rate to be 50% based on the relation between the channel utilization rate and the use effect of the communication port.
3. The method for determining the data transmission frame length of the satellite according to claim 2, wherein the converting the calculation formula of the channel utilization ratio according to the optimal value of the channel utilization ratio to obtain the bit error rate relationship of the channel utilization ratio includes:
for convenience of calculation, let β =1;
based on that the optimal value of the channel utilization rate is 50%, converting the calculation formula of the channel utilization rate to obtain a bit error rate relationship of the channel utilization rate, wherein the bit error rate relationship comprises the following steps:
4. the method for determining the data transmission frame length of the satellite according to claim 3, wherein the determining the minimum length of the data transmission frame length according to the bit error rate relationship of the channel utilization ratio comprises:
determining the proportion of the frame header length to the data transmission frame length as a preset empirical proportion value, and determining the trend relation of the error rate changing along with the frame length according to the bit error rate relation of the channel utilization rate and the proportion of the frame header length to the data transmission frame length;
and determining a sensitivity change boundary value in the trend relation of the error rate changing along with the frame length, and determining the data transmission frame length corresponding to the sensitivity change boundary value as the minimum length of the data transmission frame length.
5. The method as claimed in claim 4, wherein the determining the maximum length of the data transmission frame length, and the determining the optimal length of the data transmission frame length based on the maximum length of the data transmission frame length and the minimum length of the data transmission frame length comprises:
determining the relationship between the channel utilization rate and the sending time as follows: channel utilization = data transmission frame length/(data transmission frame length + channel idle time);
determining the maximum length of the data transmission frame length based on the relation between the channel utilization rate and the sending time and the optimal value of the channel utilization rate;
determining the relationship between the frequency utilization rate and the length of the data transmission frame as follows: when the data transmission frame is longer, the guard interval is less, the more information can be transmitted, and the higher the frequency spectrum utilization ratio of the same width is;
and determining the maximum length of the data transmission frame length as the optimal length of the data transmission frame length according to the relationship between the frequency utilization rate and the data transmission frame length.
6. An apparatus for determining a data transmission frame length of a satellite, the apparatus comprising:
the first determining module is used for determining the utilization rate of a channel and determining the minimum length of the length of a data transmission frame based on the determined utilization rate of the channel;
a second determining module, configured to determine a maximum length of a data transmission frame length, and determine an optimal length of the data transmission frame length based on the maximum length of the data transmission frame length and a minimum length of the data transmission frame length; the optimal length of the data transmission frame length is used for enabling the frequency utilization rate of data transmission to be the highest;
the first determining module determines a channel utilization rate, and determines a specific mode of the minimum length of a data transmission frame length based on the determined channel utilization rate, including:
determining an optimal value of the channel utilization rate based on the relation between the channel utilization rate and the use effect of the communication port;
determining a calculation formula of the channel utilization rate, and converting the calculation formula of the channel utilization rate according to the optimal value of the channel utilization rate to obtain a bit error rate relation of the channel utilization rate;
wherein, the calculation formula of the channel utilization rate is as follows:
wherein: x represents an approximate value of the channel utilization rate required to be set; beta represents channel compensation factors with different characteristics; l is f The length of a data transmission frame is represented; d f Indicating the length of the frame header; w is a f Representing the bit error rate of the channel; f denotes a port of the high throughput satellite communication system.
7. An apparatus for determining a data transmission frame length of a satellite, the apparatus comprising:
a memory storing executable program code;
a processor coupled with the memory;
the processor calls the executable program code stored in the memory to execute the method for determining the data transmission frame length of the satellite according to any one of claims 1 to 5.
8. A computer storage medium storing computer instructions which, when invoked, are adapted to perform a method of determining a data transmission frame length of a satellite according to any of claims 1-5.
9. A communication system for high throughput satellites, the system comprising a data transmission module; the data transmission module is used for executing the method for determining the data transmission frame length of the satellite according to any one of claims 1 to 5.
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