CN111614438B - Data fusion system and method based on power line carrier communication - Google Patents
Data fusion system and method based on power line carrier communication Download PDFInfo
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- CN111614438B CN111614438B CN202010385767.6A CN202010385767A CN111614438B CN 111614438 B CN111614438 B CN 111614438B CN 202010385767 A CN202010385767 A CN 202010385767A CN 111614438 B CN111614438 B CN 111614438B
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Abstract
The application provides a data fusion system and method based on power line carrier communication. The system comprises a main node, a fusion node and an independent node. The independent node is connected with the main node or connected with the main node through a fusion node; the fusion node is connected with the main node or connected with the main node through an independent node or the fusion node. The independent node is used for acquiring first target data of a first preset type; and determining core data of the first target data. The fusion node is used for acquiring second target data of a second preset type; and receiving core data of the first target data; and splitting the second target data, and determining fused data according to the split second target data and the core data of the first target data. And the main node is used for receiving the fused data. The application realizes the fusion in the data transmission process, saves the transmission space of data and simultaneously ensures the accuracy of data transmission.
Description
Technical Field
The present disclosure relates to the field of communications, and in particular, to a data fusion system and method based on power line carrier communication.
Background
With the gradual improvement of photovoltaic power generation technology, a large number of distributed photovoltaic power generation systems are put into production and living. Accordingly, how to collect real-time data in the photovoltaic power generation system also becomes an important research problem in the communication field.
At present, a power line carrier communication method is mainly adopted to solve the problem of collecting real-time data in a photovoltaic power generation system. Specifically, the method takes each broadband carrier module as a communication node, and gathers data of the communication nodes in a certain area to a main communication node for transmission. However, the existing power line carrier communication method simply summarizes data, and when data interaction is frequent, the summarized data volume is large, a large amount of communication space is occupied, and a large amount of communication resources are consumed.
Based on this, a data fusion system based on power line carrier communication is urgently needed at present to solve the problems that in the prior art, when data interaction is frequent, the amount of summarized data is large, a large amount of communication space is occupied, and a large amount of communication resources are consumed.
Disclosure of Invention
The application provides a data fusion system based on power line carrier communication, can be used to solve in the prior art when the data interaction is frequent, the data volume of gathering is great, has crowded a large amount of communication spaces to and consumed a large amount of communication resources's problem.
In a first aspect, an embodiment of the present application provides a data fusion system based on power line carrier communication, where the system includes a master node, a fusion node, and an independent node; the independent node is connected with the main node or connected with the main node through the fusion node; the fusion node is connected with the main node, or is connected with the main node through the independent node or the fusion node;
the independent node is used for acquiring first target data of a first preset type, and the first preset type is determined according to the type of the independent node; determining core data of the first target data according to the address field of the first target data and the data field of the first target data; sending the core data of the first target data to a fusion node connected with the independent node;
the fusion node is used for acquiring second target data of a second preset type, and the second preset type is determined according to the type of the fusion node; receiving core data of the first target data sent by the independent node; splitting the second target data, and determining fused data according to the split second target data and core data of the first target data; sending the fused data to a main node connected with the fusion node;
and the main node is used for receiving the fused data sent by the fusion node.
With reference to the first aspect, in an implementation manner of the first aspect, the fusion node is specifically configured to:
splitting the second target data to obtain a data domain of the second target data and an address domain of the second target data; determining core data of the second target data according to the data field of the second target data and the address field of the second target data; combining the core data of the first target data with the core data of the second target data to determine the core data of the fused data;
and determining the fused data according to the core data of the fused data.
With reference to the first aspect, in an implementation manner of the first aspect, the fusion node is further configured to:
splitting the second target data to obtain a frame tail of the second target data and residual data of the second target data; the residual data is data corresponding to a data field of the second target data, an address field of the second target data and a frame tail of the second target data;
determining the frame end of the second target data as the frame end of the fused data;
after the residual data of the second target data are deduplicated, determining a frame header of the fused data;
the fusion node is specifically configured to:
and determining the fused data according to the frame tail of the fused data, the frame head of the fused data and the core data of the fused data.
With reference to the first aspect, in an implementation manner of the first aspect, the number of the independent nodes corresponding to the fusion node is determined according to the number of bytes corresponding to the address field of the second target data and the number of bytes corresponding to the data field of the second target data, and the number of bytes corresponding to the address field of the first target data and the number of bytes corresponding to the data field of the first target data.
With reference to the first aspect, in an implementation manner of the first aspect, the number of independent nodes corresponding to the fusion node is determined in the following manner:
wherein n is the number of independent nodes corresponding to the fusion node, s is the sum of the byte number corresponding to the address field of the second target data and the byte number corresponding to the data field of the second target data, and x i Is the sum of the byte number corresponding to the address field of any second target data and the byte number corresponding to the data field of the second target data.
In a second aspect, an embodiment of the present application provides a data fusion method based on power carrier communication, where the method is applied to a data fusion system based on power carrier communication, and the system includes a master node, a fusion node, and an independent node; the independent node is connected with the main node or connected with the main node through the fusion node; the fusion node is connected with the main node, or is connected with the main node through the independent node or the fusion node; the method comprises the following steps:
the independent node acquires first target data of a first preset type, wherein the first preset type is determined according to the type of the independent node;
the independent node determines core data of the first target data according to the address field of the first target data and the data field of the first target data;
the independent node sends the core data of the first target data to a fusion node connected with the independent node;
the fusion node acquires second target data of a second preset type, wherein the second preset type is determined according to the type of the fusion node;
the fusion node receives core data of the first target data sent by the independent node;
the fusion node splits the second target data and determines fused data according to the split second target data and core data of the first target data;
the fusion node sends the fused data to a main node connected with the fusion node;
and the master node receives the fused data sent by the fusion node.
With reference to the second aspect, in an implementation manner of the second aspect, the splitting the second target data by the fusion node, and determining fused data according to the split second target data and core data of the first target data includes:
the fusion node splits the second target data to obtain a data domain of the second target data and an address domain of the second target data;
the fusion node determines core data of second target data according to the data field of the second target data and the address field of the second target data;
the fusion node combines the core data of the first target data and the core data of the second target data to determine the core data of the fused data;
and the fusion node determines the fused data according to the core data of the fused data.
With reference to the second aspect, in an implementation manner of the second aspect, the splitting the second target data by the fusion node, and determining fused data according to the split second target data and core data of the first target data, further includes:
the fusion node splits the second target data to obtain the frame tail of the second target data and the residual data of the second target data; the residual data is data corresponding to a data field of the second target data, an address field of the second target data and a frame tail of the second target data;
the fusion node determines the frame end of the second target data as the frame end of the fused data;
the fusion node determines a frame header of the fused data after the residual data of the second target data are deduplicated;
the fusion node is specifically configured to:
and determining the fused data according to the frame tail of the fused data, the frame head of the fused data and the core data of the fused data.
With reference to the second aspect, in an implementation manner of the second aspect, the method for determining the number of independent nodes corresponding to the fusion node includes:
and determining the number of the independent nodes corresponding to the fusion node according to the number of bytes corresponding to the address domain of the second target data and the number of bytes corresponding to the data domain of the second target data, as well as the number of bytes corresponding to the address domain of the first target data and the number of bytes corresponding to the data domain of the first target data.
With reference to the second aspect, in an implementation manner of the second aspect, the number of the independent nodes corresponding to the fusion node is determined by using the following method:
wherein n is the number of independent nodes corresponding to the fusion node, s is the sum of the byte number corresponding to the address field of the second target data and the byte number corresponding to the data field of the second target data, and x i Is the sum of the byte number corresponding to the address field of any second target data and the byte number corresponding to the data field of the second target data.
The application provides a data fusion system based on power line carrier communication, which changes the method that the data of independent nodes are simply converged to a main node without fusion in the prior art. The method provided by the application reserves the key data at each independent node, fills the key data into the redundant space of the fusion node, and deletes the repeated part in the data, thereby reserving the accuracy of each data and saving the storage space of the data. The data of each independent node is transmitted according to the selected shortest path, and the transmission mode can reduce the attenuation of the data and ensure the accuracy in the data transmission process.
Drawings
Fig. 1 is a data fusion system based on power line carrier communication according to an embodiment of the present disclosure;
fig. 2 is a schematic data structure diagram of second target data according to an embodiment of the present application;
fig. 3 is a schematic data structure diagram of fused data according to an embodiment of the present application;
fig. 4 is a distributed photovoltaic power generation local communication system provided in an embodiment of the present application;
fig. 5 is a power line carrier communication system that does not adopt a data fusion method according to an embodiment of the present application;
fig. 6 is a schematic diagram of a communication process for establishing a preset data fusion path according to an embodiment of the present disclosure;
fig. 7 is a graph comparing data volumes transmitted by using a data fusion method and data transmission without using the data fusion method in a single-phase connection manner according to an embodiment of the present disclosure;
fig. 8 is a graph comparing data volumes transmitted by using a data fusion method and data fusion methods not used in a three-phase connection manner according to an embodiment of the present disclosure;
fig. 9 is a schematic diagram of a data fusion method performed by a fusion node according to an embodiment of the present application;
fig. 10 is a schematic flowchart of a data fusion method based on power line carrier communication according to an embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Fig. 1 shows a data fusion system based on power line carrier communication according to an embodiment of the present application. The system comprises a main node, a fusion node and an independent node. Each node has data to transmit. In fig. 1, the CCO is a master node, and the PCO is a fusion node, such as the PCO1, PCO2, PCO3 … …, PCO7 shown in fig. 1; STAs are independent nodes, such as STA1, STA2, STA3 … … and STA15 shown in fig. 1; the connecting line between the nodes in the graph is a preset data fusion path. The fusion nodes are connected with the main node, or connected with the main node through independent nodes or fusion nodes, for example, the fusion nodes are connected with the main node CCO through PCO1, PCO3, PCO4, PCO5 and PCO6 shown in fig. 1, the fusion node PCO7 is connected with the main node through an independent node STA6, and the fusion node PCO2 is connected with the main node through a fusion node PCO 1.
It should be noted that the case that the fusion node is connected to the master node through the independent node occurs because the fusion node is far away from the master node and needs to be connected to the master node through another node. The reason why the merge node is connected to the master node through the merge node is that the merge node is far away from the master node and needs to be connected to the master node through another node, and the space capacity of the other node allows the data to be merged again.
The independent node is connected with the main node or connected with the main node through the fusion node. For example, STA7, STA8, and STA9 shown in fig. 1 are connected to the master node through the converged node PCO3, respectively; STA1, STA14, and STA15 are connected to the master node through a converged node PCO6, respectively; the individual nodes connected to PCO5, PCO4, and PCO2 are also connected to the master node through a fusion node. The independent node STA6 is connected to the master node.
It should be noted that the situation that the independent node is connected to the master node occurs because the fusion node correspondingly connected to the independent node is far away from the master node, and needs to be connected to the master node through the independent node.
Each independent node is connected with only one fusion node, namely, the data to be transmitted at each independent node is fused at most once.
It should be noted that fig. 1 is only an example, and the number of the fusion nodes and the number of the independent nodes shown in fig. 1 are both exemplary illustrations. A method for determining the number of fusion nodes and the number of independent nodes is provided below.
Specifically, the number of the independent nodes corresponding to the fusion node is determined according to the number of bytes corresponding to the address field of the second target data, the number of bytes corresponding to the data field of the second target data, the number of bytes corresponding to the address field of the first target data, and the number of bytes corresponding to the data field of the first target data.
The number of the independent nodes corresponding to the fusion node is determined by adopting the following mode:
in formula (1), n is the number of independent nodes corresponding to the fusion node, s is the sum of the number of bytes corresponding to the address field of the second target data and the number of bytes corresponding to the data field of the second target data, and x i Is the sum of the byte number corresponding to the address field of any second target data and the byte number corresponding to the data field of the second target data. Here, the rounding symbol is a downward rounding symbol.
In the system provided by the embodiment of the application, the main node, the fusion node and the independent node cooperate with each other to finally realize data transmission.
Specifically, the independent node is used for acquiring first target data of a first preset type, and the first preset type is determined according to the type of the independent node; determining core data of the first target data according to the address field of the first target data and the data field of the first target data; and sending the core data of the first target data to a fusion node connected with the independent node.
The fusion node is used for acquiring second target data of a second preset type, and the second preset type is determined according to the type of the fusion node; receiving core data of first target data sent by the independent node; splitting the second target data, and determining fused data according to the split second target data and the core data of the first target data; and sending the fused data to a main node connected with the fusion node.
And the main node is used for receiving the fused data sent by the fusion node.
The application provides a data fusion system based on power line carrier communication, which changes the method that the data of independent nodes are simply converged to a main node without fusion in the prior art. The method provided by the application reserves the key data at each independent node, fills the key data into the redundant space of the fusion node, and deletes the repeated part in the data, thereby reserving the accuracy of each data and saving the storage space of the data. The data of each independent node is transmitted according to the selected shortest path, and the transmission mode can reduce the attenuation of the data and ensure the accuracy in the data transmission process.
The master node, the merge node, and the independent node are described in detail below.
Independent node
Specifically, after receiving a data transmission instruction, the independent node collects first target data of a first preset type. Wherein the first preset type is determined according to the type of the independent node.
The types of the independent nodes may include an active independent node for collecting the photovoltaic inverter, a passive independent node for collecting the photovoltaic inverter, an instantaneous voltage independent node for collecting the photovoltaic inverter, an instantaneous current independent node for collecting the photovoltaic inverter, an independent node for collecting the quality of electric energy, and the like.
Correspondingly, the first preset type may be an active type of the photovoltaic inverter, a reactive type of the photovoltaic inverter, an instantaneous voltage type of the photovoltaic inverter, an instantaneous current type of the photovoltaic inverter, a power quality type, and the like.
Correspondingly, the first target data collected by the independent node may be active data of the photovoltaic inverter, or may be reactive data of the photovoltaic inverter, or may be instantaneous voltage data of the photovoltaic inverter, or may be instantaneous current data of the photovoltaic inverter, or may be electric energy quality data, and the like.
And at the independent node, extracting the address field in the first target data and the data field of the first target data, and combining the two to determine the core data of the first target data. In the embodiment of the present application, the core data in the first target data includes a 48-bit address field and a 32-bit data field.
There are various ways of determining the core data of the first target data, and one common way is that the address field in the first target data is before and the data field in the first target data is after.
Another common way is that the data field in the first target data is preceding and the address field in the first target data is succeeding.
It should be noted that the two common manners are only exemplary, and there are various manners of determining the core data of the first target data, which are not specifically limited in the embodiments of the present application.
After determining key information of the first target data, namely core data of the first target data, the independent node sends the core data of the first target data to a fusion node connected with the independent node along a preset fusion path.
(2) Fusion node
Specifically, the fusion node is configured to split the second target data to obtain a data field of the second target data and an address field of the second target data; determining core data of the second target data according to the data field of the second target data and the address field of the second target data; and combining the core data of the first target data with the core data of the second target data to determine the core data of the fused data.
Further, the fusion node is further configured to split the second target data to obtain a frame end of the second target data and remaining data of the second target data. The residual data is data corresponding to the data field except the second target data, the address field of the second target data and the frame end of the second target data. Further, the end of frame of the second target data may be determined as the end of frame of the fused data, and the frame header of the fused data may be determined after the remaining data of the second target data is deduplicated. Further, the fused data may be determined according to a frame end of the fused data, a frame header of the fused data, and core data of the fused data.
It should be noted that, in the embodiment of the present application, the fusion node is a special independent node, and therefore, the second target data of the second preset type collected by the fusion node is consistent with the first target data in terms of data structure.
Fig. 2 is a schematic diagram of a data structure of second target data according to an embodiment of the present application. In general, the second target data collected by the fusion node includes 16 bytes, and one byte corresponds to 8 bits, so that the second target data is 128 bits. There is a large amount of fixed data in these 128 bits, such as an 8-bit frame start, an 8-bit control code, an 8-bit check code, an 8-bit end, etc. And under the same instruction of data transmission, the fixed data in the acquired first target data are the same by different independent nodes. The data structure of the first target data is the same as that of the second target data, and the fixed data is the premise of data fusion.
The process of data fusion can be implemented at a fusion node. Fig. 3 is a schematic diagram of a data structure of fused data according to an embodiment of the present application. The fused data consists of a frame head, core data and a frame tail.
The fusion node firstly splits the second target data, extracts the address domain in the second target data and the data domain of the second target data, combines the two, and determines the core data of the second target data in the same way as the independent node. After determining the core data of the second target data, the fusion node combines the received core data of the first target data with the core data of the second target data, and determines the core data of the fused data.
A piece of data is expressed completely, and a fixed data part in the data is indispensable. The frame end of the original second target data does not need to be changed, and the fusion node can directly use the frame end of the fused data as the frame end of the fused data.
The second target data is removed from the data field, address field and frame trailer, leaving two repeated 8-bit frame start, 8-bit control code and 8-bit data length fields. After the duplication removal of the fusion node, the 8-bit frame start symbol, the 8-bit control code and the 8-bit data length field are used as the 24-bit head identification of the fused data, namely the frame header of the fused data.
After determining the frame header of the fused data, the core data of the fused data and the frame tail of the fused data, the fusion node combines the frame header, the core data and the frame tail according to the sequence of the frame header, the core data and the frame tail to obtain the fused data.
Consider that in a communication protocol, a 32-bit data field typically takes only 4 bytes, but 50 bytes are reserved for reading data. There is a large amount of empty space in these 50 bytes, and therefore, these empty spaces can be inserted into the core data of the first target data.
In order to more clearly express how the method provided by the embodiment of the present application saves the data storage space, the following description is provided.
The total byte number of the fused data at any fusion node is as follows:
in the formula (2), n is the number of independent nodes corresponding to the fusion node, x i Is the sum of the byte number corresponding to the address field of any second target data and the byte number corresponding to the data field of the second target data, s is the sum of the byte number corresponding to the address field of the second target data and the byte number corresponding to the data field of the second target data, a is the byte number occupied by the fixed data, and the value of a is 7 in one case, X (X) i ) Is the total byte length of the fused data.
If data fusion is not carried out, under the same number of independent nodes, the determination mode of the comprehensive length of the data to be transmitted is as follows:
x ═ n +1) (s + b) formula (3)
In the formula (3), X is the total number of bytes of data under the same number of independent nodes, n +1 is the number of independent nodes, s is the sum of the number of bytes corresponding to the address field of the second target data and the number of bytes corresponding to the data field of the second target data, that is, the sum of the number of bytes corresponding to the address field of the first target data and the number of bytes corresponding to the data field of the first target data at the independent nodes, and b is the number of bytes corresponding to the fixed data of the second target data field before fusion, and since duplication is not removed, it is obvious that the value of b is greater than a. Obviously, the total byte number of the fused data is less than that of the data under the same number of independent nodes before fusion. The fused data can greatly save data transmission space.
For example, suppose that a photovoltaic region includes 100 carrier communication independent nodes, each node transmits forward active power to the master node, and if each independent node transmits data to the master node separately, the amount of data transmitted by the whole communication system is 1600 bytes. When the data fusion method is adopted for transmission, the data and the address of each independent node account for 10 bytes, and one fusion node can fuse 4 nearby subordinate independent nodes at most, so that at least 20 fusion nodes in the system transmit the fusion data to the main node, the minimum value of the data quantity to be uploaded in the whole communication system is 1100 bytes, and the data quantity is reduced to 68.75 percent of the original data quantity compared with the data quantity which is not transmitted by the fusion method.
The number of data in the data transmission process corresponds to the number of bytes of data transmission. In the embodiment of the present application, after data fusion, the determination manner of the number of data is as follows:
in the formula (4), the first and second groups,
c is the data transmitted over the top, and different values are taken according to the fusion type (lossy fusion and lossless fusion); (xi-ci) is the information segment length of the input data packet; m is i For data compression rate, m i The value is determined by the entropy value of the data to be fused, and since the information fusion does not increase the load of each input data packet, m is usually the case i Less than or equal to 1; n is the number of independent nodes corresponding to the fusion node; i denotes the ith individual node.
The number of data to be transmitted before data fusion is the number of independent nodes, and the number of data to be transmitted after data fusion is the number of fusion nodes. Because the number of the fusion nodes is less than or equal to that of the independent nodes, the number of the data needing to be transmitted after the data fusion is generally less than that of the data needing to be transmitted before the data fusion. In terms of the number of data to be transmitted, the data fusion can reduce the number of data transmission and save the data transmission space.
And finally, the fusion node sends the fused data to a main node connected with fusion along a preset data fusion path.
(3) Master node
And the master node receives the fused data and transmits the fused data to a server of the distributed photovoltaic power generation control master station in a remote communication mode, so that the master station can collect the information of each photovoltaic inverter.
Fig. 4 shows a distributed photovoltaic power generation local communication system provided in an embodiment of the present application. A single photovoltaic inverter or a plurality of photovoltaic inverters in a photovoltaic region are provided with a broadband power line carrier module, the carrier module transmits data of the photovoltaic inverters to a concentrator in a broadband power line carrier communication mode, and the concentrator is a main node in the embodiment of the application. The concentrator transmits data to the distributed photovoltaic power generation control master station server through remote communication, and then control of the control center on the photovoltaic power generation system is achieved.
In the embodiment of the application, the transmission between data can be realized through a preset data fusion path. The preset data fusion path is specifically described below.
Each communication node needs to establish a communication link with the master node, a plurality of transmission paths are arranged between each node and the master node, the shortest effective path (namely a preset data fusion path) between the master node and each node in the network topology is found, the attenuation amplitude of high-frequency signals in the power line carrier communication transmission process is effectively reduced, and the transmission success rate is improved.
Fig. 5 shows a power carrier communication system that does not adopt a data fusion method according to an embodiment of the present application. Each number in the figure represents an independent node, with the CCO being the master node. The independent node is directly connected with the main node or connected with the main node through other independent nodes. In contrast, in the embodiment of the application, on the basis of the connection path of the existing power carrier communication system, the preset data fusion path is determined by using the minimum spanning tree algorithm.
The algorithm flow of the minimum spanning tree is described below.
Specifically, in a photovoltaic region including M independent nodes, the physical connection of each independent node may be represented as a directed graph G (V, E), where V ═ mau { s } is a set of M +1 nodes, s is a master node, i.e., a concentrator, and E is an edge set between the nodes. It is therefore necessary to establish a minimum spanning tree of m communication nodes to the master node s. Given a network N ═ V, E, W, where V is the set of network nodes, E is the set of network edges, W is the weight of tree T, let T ═ V, E ') be one support tree of directed graph G, where V is the set of points of tree T and E' is the set of edges of tree T, let
w(T)＝∑ e∈E′ w (e) formula (5)
In the formula (5), w (T) represents the weight of T, and the minimum spanning tree in the directed graph G is the connected tree that minimizes w (T).
The process of building the minimum spanning tree for network G is described below. Setting a set of vertex points of the directed graph G as U, randomly selecting one point in the directed graph G as a starting point a, and adding the starting point into the set V; the set B is formed by subtracting the set V from the set U, then another vertex B is found from the set B, so that the weight from the vertex B to any point in the set V is minimum, and the B is added into the set V; when the set V is { a, b }. And in the same way, finding another vertex c from the set B to ensure that the weight of the vertex c to any point in the V is minimum, adding c into the set V, and in the same way, until all the vertices are added into the V, and constructing a minimum spanning tree.
Fig. 7 is a schematic view of a communication process for establishing a preset data fusion path according to an embodiment of the present application. It can be seen from the figure that when a preset data fusion path is established between each node and the master node, three communication processes, namely a registration request, a registration confirmation, and a reply of the registration confirmation, need to be completed.
Through the steps, the preset data fusion path in the embodiment of the application is generated based on the minimum spanning tree. In the process of transmitting data through power line carrier communication, collected photovoltaic data need to be modulated to a high-frequency band for transmission, and the attenuation amplitude of the high-frequency data is related to the transmission distance. The preset data fusion path can effectively reduce the attenuation of data in the transmission process and furthest reserve the accuracy of the data.
After analyzing each part of the embodiment of the present application, the performance of the data fusion system proposed in the embodiment of the present application is verified by using two examples.
Considering that each carrier module and the concentrator have two connection modes of three phases and single phase, the embodiment of the application respectively compares the data transmission quantity of the data fusion method and the data fusion method which is not used under two conditions of three-phase connection and single-phase connection.
The first example is as follows:
as shown in fig. 8, a graph is provided for comparing data volumes transmitted by using a data fusion method and data volumes transmitted by not using the data fusion method in a single-phase connection mode according to an embodiment of the present application. As can be seen from the figure, for a large-scale photovoltaic communication network requiring collection of a large amount of inverter data, the data volume generated when the data fusion method is used for data transmission is smaller than that when the data fusion transmission is not used, and particularly when there are many carrier communication nodes, the carrier communication data volume is greatly reduced.
Example two:
as shown in fig. 9, a comparison graph of data volumes transmitted by using a data fusion method and data volumes transmitted by not using the data fusion method in a three-phase connection mode is provided in the embodiments of the present application. Under the same network scale, the communication nodes in the network are assumed to be evenly distributed on each phase, and it can be seen from the figure that for the same network scale, the communication nodes in the network are evenly distributed on three phases, so that the data volume generated by the power line carrier communication on each phase can be effectively reduced, and compared with a method without using a fusion method, the data volume of the carrier communication is obviously reduced by using a data fusion method.
The following are embodiments of methods of the present application that may be used to implement embodiments of systems of the present application. For details which are not disclosed in the method embodiments of the present application, reference is made to the system embodiments of the present application.
To more clearly describe the above method, it is explained in conjunction with the illustration of fig. 9. Fig. 9 exemplarily shows a schematic diagram of a data fusion method performed by a fusion node according to an embodiment of the present application. As can be seen from fig. 9, the merge node extracts the core data of the first target data from the independent node and extracts the core data of the second target data from itself, and then puts the core data of the first target data and the core data of the second target data into the merge cache pool. The fusion node is based on a fusion criterion (i.e.
) And finally, the fused data are transmitted to a network layer (namely a main node).
Fig. 10 exemplarily shows a flowchart of a data fusion method based on power carrier communication according to an embodiment of the present application. The method provided by the embodiment of the application is applied to a data fusion system based on power line carrier communication, and the system comprises a main node, a fusion node and an independent node; the main node is connected with one or more fusion nodes or independent node points, and the fusion node is connected with one or more independent nodes or fusion nodes. The specific flow is as follows:
step 1001, the independent node acquires first target data of a first preset type, where the first preset type is determined according to the type of the independent node.
In step 1002, the independent node determines core data of the first target data according to the address field of the first target data and the data field of the first target data.
In step 1003, the independent node sends the core data of the first target data to the fusion node connected with the independent node.
Step 1004, the fusion node acquires second target data of a second preset type, wherein the second preset type is determined according to the type of the fusion node.
Step 1005, the fusion node receives the core data of the first target data sent by the independent node.
Step 1006, the fusion node splits the second target data, and determines the fused data according to the split second target data and the core data of the first target data.
Step 1007, the fusion node sends the fused data to the master node connected with the fusion node.
Step 1008, the master node receives the fused data sent by the fused node.
Optionally, the splitting, by the fusion node, the second target data, and determining the fused data according to the split second target data and the core data of the first target data, including:
and the fusion node splits the second target data to obtain a data domain of the second target data and an address domain of the second target data.
And the fusion node determines the core data of the second target data according to the data field of the second target data and the address field of the second target data.
And the fusion node combines the core data of the first target data and the core data of the second target data to determine the core data of the fused data.
And the fusion node determines the fused data according to the core data of the fused data.
Optionally, the splitting, by the fusion node, the second target data, and determining the fused data according to the split second target data and the core data of the first target data, further including:
the fusion node splits the second target data to obtain the frame tail of the second target data and the residual data of the second target data; the remaining data is data corresponding to the data field excluding the second target data, the address field excluding the second target data, and the end of frame excluding the second target data.
And the fusion node determines the frame tail of the second target data as the frame tail of the fused data.
And the fusion node determines the frame header of the fused data after the residual data of the second target data are deduplicated.
The fusion node is specifically configured to:
and determining the fused data according to the frame tail of the fused data, the frame head of the fused data and the core data of the fused data.
Optionally, the method for determining the number of independent nodes corresponding to the fusion node includes:
and determining the number of the independent nodes corresponding to the fusion node according to the byte number corresponding to the address field of the second target data, the byte number corresponding to the data field of the second target data, the byte number corresponding to the address field of the first target data and the byte number corresponding to the data field of the first target data.
Optionally, the number of the independent nodes corresponding to the fusion node is determined by the following method:
wherein n is the number of independent nodes corresponding to the fusion node, s is the sum of the byte number corresponding to the address field of the second target data and the byte number corresponding to the data field of the second target data, and x i Is the sum of the byte number corresponding to the address field of any second target data and the byte number corresponding to the data field of the second target data.
The application provides a data fusion method based on power line carrier communication, which changes the method that the data of independent nodes are simply converged to a main node without fusion in the prior art. The method provided by the application reserves the key data at each independent node, fills the key data into the redundant space of the fusion node, and deletes the repeated part in the data, thereby reserving the accuracy of each data and saving the storage space of the data. The data of each independent node is transmitted according to the selected shortest path, and the transmission mode can reduce the attenuation of the data and ensure the accuracy in the data transmission process.
The invention is operational with numerous general purpose or special purpose computing system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.
The invention may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The invention may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (8)
1. A data fusion system based on power line carrier communication is characterized by comprising a main node, a fusion node and an independent node; the independent node is connected with the main node or connected with the main node through the fusion node; the fusion node is connected with the main node, or is connected with the main node through the independent node or the fusion node;
the independent node is used for acquiring first target data of a first preset type, and the first preset type is determined according to the type of the independent node; determining core data of the first target data according to the address field of the first target data and the data field of the first target data; sending the core data of the first target data to a fusion node connected with the independent node;
the fusion node is used for acquiring second target data of a second preset type, and the second preset type is determined according to the type of the fusion node; receiving core data of the first target data sent by the independent node; splitting the second target data, and determining fused data according to the split second target data and core data of the first target data; sending the fused data to a main node connected with the fusion node;
the master node is used for receiving the fused data sent by the fusion node;
the fusion node is specifically configured to:
splitting the second target data to obtain a data domain of the second target data and an address domain of the second target data; determining core data of second target data according to the data field of the second target data and the address field of the second target data; combining the core data of the first target data with the core data of the second target data to determine the core data of the fused data;
and determining the fused data according to the core data of the fused data.
2. The system of claim 1, wherein the fusion node is further configured to:
splitting the second target data to obtain a frame tail of the second target data and residual data of the second target data; the residual data is data corresponding to a data field of second target data, an address field of the second target data and a frame end of the second target data;
determining the frame end of the second target data as the frame end of the fused data;
after the residual data of the second target data are deduplicated, determining a frame header of the fused data;
the fusion node is specifically configured to:
and determining the fused data according to the frame tail of the fused data, the frame head of the fused data and the core data of the fused data.
3. The system of claim 1, wherein the number of the independent nodes corresponding to the fusion node is determined according to the number of bytes corresponding to the address field of the second target data and the data field of the second target data, and the number of bytes corresponding to the address field of the first target data and the data field of the first target data.
4. The system according to claim 3, wherein the number of the independent nodes corresponding to the fusion node is determined by the following method:
wherein n is the number of independent nodes corresponding to the fusion node, s is the sum of the byte number corresponding to the address field of the second target data and the byte number corresponding to the data field of the second target data, and x i Is the sum of the byte number corresponding to the address field of any second target data and the byte number corresponding to the data field of the second target data.
5. A data fusion method based on power line carrier communication is characterized in that the method is applied to a data fusion system based on power line carrier communication, and the system comprises a main node, a fusion node and an independent node; the independent node is connected with the main node or connected with the main node through the fusion node; the fusion node is connected with the main node, or is connected with the main node through the independent node or the fusion node; the method comprises the following steps:
the independent node acquires first target data of a first preset type, wherein the first preset type is determined according to the type of the independent node;
the independent node determines core data of the first target data according to the address field of the first target data and the data field of the first target data;
the independent node sends the core data of the first target data to a fusion node connected with the independent node;
the fusion node acquires second target data of a second preset type, wherein the second preset type is determined according to the type of the fusion node;
the fusion node receives core data of the first target data sent by the independent node;
the fusion node splits the second target data and determines fused data according to the split second target data and core data of the first target data;
the fusion node sends the fused data to a main node connected with the fusion node;
the master node receives the fused data sent by the fusion node;
the fusion node splits the second target data, and determines fused data according to the split second target data and core data of the first target data, including:
the fusion node splits the second target data to obtain a data domain of the second target data and an address domain of the second target data;
the fusion node determines core data of second target data according to the data field of the second target data and the address field of the second target data;
the fusion node combines the core data of the first target data and the core data of the second target data to determine the core data of the fused data;
and the fusion node determines the fused data according to the core data of the fused data.
6. The method of claim 5, wherein the fused node splits the second target data, and determines fused data according to the split second target data and core data of the first target data, further comprising:
the fusion node splits the second target data to obtain the frame tail of the second target data and the residual data of the second target data; the residual data is data corresponding to a data field of second target data, an address field of the second target data and a frame end of the second target data;
the fusion node determines the frame end of the second target data as the frame end of the fused data;
the fusion node determines a frame header of the fused data after the residual data of the second target data are deduplicated;
the fusion node is specifically configured to:
and determining the fused data according to the frame tail of the fused data, the frame head of the fused data and the core data of the fused data.
7. The method according to claim 5, wherein the determining the number of the independent nodes corresponding to the fusion node comprises:
and determining the number of the independent nodes corresponding to the fusion node according to the number of bytes corresponding to the address domain of the second target data and the number of bytes corresponding to the data domain of the second target data, as well as the number of bytes corresponding to the address domain of the first target data and the number of bytes corresponding to the data domain of the first target data.
8. The method according to claim 5, wherein the number of the independent nodes corresponding to the fusion node is determined by the following method:
wherein n is the number of independent nodes corresponding to the fusion node, s is the sum of the byte number corresponding to the address field of the second target data and the byte number corresponding to the data field of the second target data, and x i Is the sum of the byte number corresponding to the address field of any second target data and the byte number corresponding to the data field of the second target data.
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