CN112911674A - Data transmission method, device, equipment and storage medium - Google Patents
Data transmission method, device, equipment and storage medium Download PDFInfo
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Abstract
The invention discloses a data transmission method, a device, equipment and a storage medium, wherein the method comprises the following steps: determining a source node and a target node in a wireless ad hoc network system, and a plurality of transmission paths capable of transmitting data between the source node and the target node; determining that the channel capacity of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point is the current channel capacity, and determining that the frequency points corresponding to the maximum current channel capacity between every two adjacent nodes are the transmission frequency points; calculating capacity coefficients corresponding to all nodes contained in each transmission path based on the current channel capacity, and selecting one transmission path as the current path based on the capacity coefficients; and distributing the data to be transmitted to the current path, and controlling the data transmission between every two adjacent nodes in the current path according to the corresponding transmission frequency point. The method and the device can effectively avoid the interference between the nodes and simultaneously improve the transmission efficiency, and obviously improve the overall throughput rate performance of the system.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a data transmission method, apparatus, device, and storage medium.
Background
The MESH communication system of the wireless ad hoc network (referred to as the wireless ad hoc network system for short) generally adopts the same-frequency networking technology, supports multi-hop relay, and can randomly move each node and quickly reconstruct a route when the topology of the system is changed quickly. In brief, in the existing wireless ad hoc network system, all nodes use the same frequency to transmit signals, and the transmission between different nodes is distinguished by a time division system; in practical application, when the number of nodes is increased and the coverage area is increased, the wireless interference among some nodes is increased frequently, and the rest nodes have no interference, so that an effective frequency cannot be found in a frequency band range, and all nodes are free of interference. In summary, in the existing wireless ad hoc network system, a problem may occur that a part of nodes are interfered, and further, the overall throughput performance of the system is significantly reduced.
Disclosure of Invention
The invention aims to provide a data transmission method, a data transmission device, data transmission equipment and a data transmission storage medium, which can effectively avoid the interference between nodes, improve the transmission efficiency and obviously improve the overall throughput rate performance of a system.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method of data transmission, comprising:
determining a source node and a target node in a wireless ad hoc network system, and a plurality of transmission paths capable of transmitting data between the source node and the target node;
determining that the channel capacity of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point is the current channel capacity, and determining that the frequency points corresponding to the maximum current channel capacity between every two adjacent nodes are the transmission frequency points;
calculating capacity coefficients corresponding to all nodes contained in each transmission path based on the current channel capacity, and selecting one transmission path as a current path based on the capacity coefficients;
and distributing the data to be transmitted to the current path, and controlling the data transmission between every two adjacent nodes in the current path according to the corresponding transmission frequency point.
Preferably, calculating capacity coefficients corresponding to all nodes included in each transmission path based on the current channel capacity includes:
calculating capacity coefficients corresponding to all nodes contained in each transmission path according to the following formula:
where t denotes time, CC (t, L) denotes a capacity coefficient of an arbitrary transmission path, Lqy denotes the total number of nodes included in the arbitrary transmission path, and Ca (t, Lq (N-1), Lq (N)) denotes the maximum current channel capacity between the N-1 st node and the N-th node in the arbitrary transmission path.
Preferably, before determining that the frequency points correspondingly adopted by the maximum current channel capacity between every two adjacent nodes are all transmission frequency points, the method further comprises:
calculating the weighted channel capacity of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point according to the following formula:
Ca(t,LLq(N-1)Lq(N)kN)＝a Ca(t,LLq(N-1)Lq(N)kN)+(1-a)Ca(t-1,LLq(N-1)Lq(N)kN)，
wherein, Ca (t, L)Lq(N-1)Lq(N)kN) Representing the N-1 st node in any transmission pathThe weighted channel capacity of data transmission between the Nth nodes is carried out by adopting a frequency point KN, and a represents a weighted coefficient;
and determining the weighted channel capacity of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point as the current channel capacity.
Preferably, determining that the channel capacity of data transmission between every two adjacent nodes in each transmission path by using each frequency point is the current channel capacity includes:
determining the signal-to-noise ratio of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point, determining the physical layer transmission mode of the wireless ad hoc network system, determining a corresponding relation table of the wireless ad hoc network system for expressing the signal-to-noise ratio and the channel capacity under the corresponding physical layer transmission mode, and determining that the channel capacity respectively corresponding to each signal-to-noise ratio is the current channel capacity from the corresponding relation table.
Preferably, determining that the channel capacity of data transmission between every two adjacent nodes in each transmission path by using each frequency point is the current channel capacity includes:
determining the signal-to-noise ratio of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point, determining the physical layer transmission mode of the wireless ad hoc network system, determining a curve of the wireless ad hoc network system expressing the signal-to-noise ratio and the channel capacity under the corresponding physical layer transmission mode, and determining that the channel capacity respectively corresponding to each signal-to-noise ratio is the current channel capacity from the curve.
Preferably, the controlling of data transmission between every two adjacent nodes in the current path according to the corresponding transmission frequency point includes:
and controlling data transmission between every two adjacent nodes in the current path according to the corresponding transmission frequency point in a time interval determined by dividing time slots based on a TDMA system.
Preferably, after controlling data transmission between every two adjacent nodes in the current path according to the corresponding transmission frequency point, the method further includes:
and returning the information that the transmission of the data needing to be transmitted is realized.
A data transmission apparatus comprising:
a first determination module to: determining a source node and a target node in a wireless ad hoc network system, and a plurality of transmission paths capable of transmitting data between the source node and the target node;
a second determination module to: determining that the channel capacity of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point is the current channel capacity, and determining that the frequency points corresponding to the maximum current channel capacity between every two adjacent nodes are the transmission frequency points;
a selection module for: calculating capacity coefficients corresponding to all nodes contained in each transmission path based on the current channel capacity, and selecting one transmission path as a current path based on the capacity coefficients;
a transmission module to: and distributing the data to be transmitted to the current path, and controlling the data transmission between every two adjacent nodes in the current path according to the corresponding transmission frequency point.
A data transmission device comprising:
a memory for storing a computer program;
a processor for implementing the steps of the data transmission method as described in any one of the above when executing the computer program.
A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the data transmission method according to any one of the preceding claims.
The invention provides a data transmission method, a device, equipment and a storage medium, wherein the method comprises the following steps: determining a source node and a target node in a wireless ad hoc network system, and a plurality of transmission paths capable of transmitting data between the source node and the target node; determining that the channel capacity of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point is the current channel capacity, and determining that the frequency points corresponding to the maximum current channel capacity between every two adjacent nodes are the transmission frequency points; calculating capacity coefficients corresponding to all nodes contained in each transmission path based on the current channel capacity, and selecting one transmission path as a current path based on the capacity coefficients; and distributing the data to be transmitted to the current path, and controlling the data transmission between every two adjacent nodes in the current path according to the corresponding transmission frequency point. Therefore, the frequency point which can maximize the channel capacity between every two adjacent nodes in the transmission path for realizing data transmission is selected as the transmission frequency point, so that the transmission of data between corresponding nodes is realized based on the transmission frequency point, the data transmission between different nodes can be realized by utilizing different frequencies so as to avoid the interference between the nodes, and the maximum channel capacity can be realized when the data transmission between different nodes is realized so as to improve the transmission efficiency; in addition, a capacity coefficient representing the performance condition of each transmission path is calculated based on the maximum channel capacity which can be achieved between every two adjacent nodes in the transmission path for realizing data transmission, and then one transmission path with the best performance condition is selected for data transmission based on the capacity coefficient, so that the data transmission can be realized by using the transmission path with the best performance condition to improve the transmission efficiency; therefore, the data transmission is realized by using different frequency points and selecting a better path among different nodes, the interference among the nodes can be effectively avoided, the transmission efficiency is improved, and the overall throughput rate performance of the system is obviously improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a data transmission method according to an embodiment of the present invention;
fig. 2 is a graph showing a correspondence between a signal-to-noise ratio and a channel capacity when 16QAM is modulated in a data transmission method according to an embodiment of the present invention;
fig. 3 is a graph showing a correspondence relationship between a signal-to-noise ratio and a channel capacity in QPSK modulation in a data transmission method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a data transmission device according to an embodiment of the present invention.
Detailed Description
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.
Referring to fig. 1, a flowchart of a data transmission method according to an embodiment of the present invention is shown, which specifically includes:
s11: determining a source node and a target node in a wireless ad hoc network system, and a plurality of transmission paths capable of transmitting data between the source node and the target node.
The execution main body of the data transmission method provided by the embodiment of the invention can be a corresponding data transmission device, and the data transmission device can be integrated in a digital integrated circuit chip, so that the execution main body of the data transmission method can be the digital integrated circuit chip. It should be noted that the wireless ad hoc network system is a short-term wireless ad hoc network MESH communication system, the wireless ad hoc network system includes a plurality of nodes capable of performing data transmission, and for any two nodes in the wireless ad hoc network system that need to perform data transmission, the any two nodes can be respectively used as a source node and a target node, so as to perform data transmission between the source node and the target node. Specifically, it may be set that Y nodes and K frequency points exist in the wireless ad hoc network system, and any two nodes support each otherSelecting any one of K frequency points for data transmission; setting the physical layer transmission mode between any two nodes as LijkI and j are numbers of nodes, and can take values from 1 to Y, that is, i, j is 1,2.. Y; k is a frequency point selected for data transmission between the node i and the node j, and can be 1 to K, that is, K is 1,2.. K; corresponding LijkAnd indicating that the two nodes, namely the node i and the node j, adopt the frequency point k for data transmission.
S12: and determining that the channel capacity of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point is the current channel capacity, and determining that the frequency points corresponding to the maximum current channel capacity between every two adjacent nodes are the transmission frequency points.
After the source node and the target node are determined, a plurality of transmission paths capable of realizing data transmission from the source node to the target node can be determined, each transmission path comprises at least one node except the source node and the target node, and the at least one node is used as a node needing to jump in the data transmission process, namely a relay node; if the source node is node 1 and the destination node is node 4, the transmission path may include multiple transmission paths, such as node 1-node 2-node 4, node 1-node 3-node 4, and node 1-node 2-node 3-node 4. Specifically, L different transmission paths Lq may be set between the source node and the target node, and q may take values from 1 to L, that is, q is 1,2.. L; and the nodes passed by the Lq-th transmission path may be denoted as Lq (Nq), Nq may take values of 1 to Yqy, and Yqy is the total number of nodes included in the transmission path Lq, that is, Nq is 1,2.. Yqy, and the total number of passed nodes is Yqy.
The adjacency of two adjacent nodes in the transmission path indicates that when data transmission is carried out between the two nodes, other nodes do not need to be jumped, and one node directly sends data to the other node; for the situation that any two adjacent nodes in any transmission path adopt any frequency point for data transmission, the signal-to-noise ratio of the data transmission between the two nodes adopting the any frequency point can be determined and expressed as SNR (t, i, j, k), namely the signal-to-noise ratio of the data transmission between the node i and the node j adopting the kth frequency point when the SNR (t, i, j, k) expresses time t (the data transmission method can be realized based on the time t in the embodiment of the application); and determining the channel capacity corresponding to the signal-to-noise ratio as the channel capacity of data transmission between the two nodes at the time t by adopting the arbitrary frequency point. The method and the device can determine the channel capacity when data transmission is carried out between every two adjacent nodes in each transmission path by adopting each frequency point, if any two adjacent nodes in any transmission path are respectively a node i and a node j, the channel capacity when data transmission is carried out between the node i and the node j corresponds to the frequency point adopted when data transmission is carried out between the node i and the node j one by one, and the performance is better when the data transmission is realized as the channel capacity is larger, so the largest channel capacity in all the channel capacities when the data transmission is carried out between the node i and the node j is selected, and the frequency point corresponding to the largest channel capacity is determined to be the frequency point k which is adopted when the data transmission is carried out between the node i and the node j. And determining the maximum channel capacity as the current channel capacity, namely assigning the maximum channel capacity to the current channel capacity.
Specifically, if any two adjacent nodes in any transmission path are node i and node j, respectively, after obtaining the SNR (t, i, j, k) of the signal-to-noise ratio when the node i and node j perform data transmission by using the frequency point k at time t, the channel capacity Ca (t, L) for performing data transmission at time t between every two adjacent nodes in L different transmission paths can be calculatedLq(N-1)Lq(N)kN) N denotes the node number, Lq (N-1) and Lq (N) may denote nodes that hop through N-1 in the Lq-th transmission path (i.e., N-1-th node and nth node, respectively), and kN is 1,2.. K, which denotes different frequency points; the maximum value of the channel capacity of the node through which the (N-1) th hop in the Lq-th transmission path is selected can be represented as:
in this case, Ca (t, Lq (N-1), Lq (N)) is selected to have a kN valuekN (t, N), that is, Lq (N-1) and Lq (N), may represent frequency points used by nodes passing through the N-1 th hop in the Lq-th transmission path during data transmission, and the corresponding modulation mode may be represented as LLq(N-1)Lq(N)kN(t,N)。
S13: and calculating capacity coefficients corresponding to all nodes contained in each transmission path based on the current channel capacity, and selecting one transmission path as the current path based on the capacity coefficients.
After the current channel capacity between every two adjacent nodes included in any transmission path is obtained, comprehensive calculation can be performed based on the current channel capacity between every two adjacent nodes included in the any transmission path to obtain a capacity coefficient of the any transmission path, so that the capacity coefficient can represent the total condition of the channel capacity of the any transmission path when the data transmission between the source node and the target node is realized, that is, to realize the performance condition of the data transmission, a transmission path with the best performance condition for realizing the data transmission is selected as a current path from transmission paths for realizing the data transmission between the source node and the target node based on the capacity coefficient, and the data transmission is realized based on the current path in the following.
S14: and distributing the data to be transmitted to the current path, and controlling the data transmission between every two adjacent nodes in the current path according to the corresponding transmission frequency point.
The transmission frequency point corresponding to each two adjacent nodes in the current path is also the frequency point used by the maximum channel capacity between the two adjacent nodes. After the current path is determined, data to be transmitted between the source node and the target node may be allocated to the current path, so as to implement data transmission based on the current path.
The method comprises the steps of determining a source node and a target node which need to realize data transmission in a wireless ad hoc network system and a plurality of transmission paths between the source node and the target node, selecting a frequency point which is used when the channel capacity between every two adjacent nodes is the maximum through the channel capacity of adopting every frequency point to carry out data transmission between every two adjacent nodes in every transmission path as a transmission frequency point, calculating a capacity coefficient which represents the performance condition of every transmission path when carrying out data transmission through the channel capacity of adopting every frequency point to carry out data transmission between every two adjacent nodes in every transmission path, selecting a transmission path with the best performance condition based on the capacity coefficient as a current path, distributing data to the current path when realizing data transmission, and controlling every two adjacent nodes in the current path to carry out data transmission according to the corresponding transmission frequency points. Therefore, the frequency point which can maximize the channel capacity between every two adjacent nodes in the transmission path for realizing data transmission is selected as the transmission frequency point, so that the transmission of data between corresponding nodes is realized based on the transmission frequency point, the data transmission between different nodes can be realized by utilizing different frequencies so as to avoid the interference between the nodes, and the maximum channel capacity can be realized when the data transmission between different nodes is realized so as to improve the transmission efficiency; in addition, a capacity coefficient representing the performance condition of each transmission path is calculated based on the maximum channel capacity which can be achieved between every two adjacent nodes in the transmission path for realizing data transmission, and then one transmission path with the best performance condition is selected for data transmission based on the capacity coefficient, so that the data transmission can be realized by using the transmission path with the best performance condition to improve the transmission efficiency; therefore, the data transmission is realized by using different frequency points and selecting a better path among different nodes, the interference among the nodes can be effectively avoided, the transmission efficiency is improved, and the overall throughput rate performance of the system is obviously improved.
In the data transmission method provided in the embodiment of the present invention, calculating capacity coefficients corresponding to all nodes included in each transmission path based on the current channel capacity may include:
calculating capacity coefficients corresponding to all nodes contained in each transmission path according to the following formula:
where t denotes time, CC (t, L) denotes a capacity coefficient of an arbitrary transmission path, Lqy denotes the total number of nodes included in the arbitrary transmission path, and Ca (t, Lq (N-1), Lq (N)) denotes the maximum current channel capacity between the N-1 st node and the N-th node in the arbitrary transmission path.
In order to make the selected current path be the path with the best performance, in the embodiment of the present application, after determining the current channel capacity between every two adjacent nodes included in any transmission path, the present application may further perform comprehensive calculation based on the current channel capacity between every two adjacent nodes included in the any transmission path to obtain the capacity coefficient of the any transmission path, so that the capacity coefficient can represent the total situation of the channel capacity that the any transmission path has when implementing data transmission between the source node and the target node, that is, to implement the performance of data transmission, and further select a transmission path with the best performance for implementing data transmission from the transmission paths implementing data transmission between the source node and the target node based on the capacity coefficient as the current path to implement data transmission based on the current path in the following, data transmission can be realized by using a transmission path with better performance so as to improve the transmission efficiency.
In a specific implementation manner, when calculating the capacity coefficient, the embodiment of the present application may perform weighted calculation on the current channel capacity between every two adjacent nodes included in any transmission path to obtain a corresponding capacity coefficient, where the larger the capacity coefficient is, the better the performance condition of the transmission path is, and therefore, a transmission path with the largest capacity coefficient needs to be selected as the current path; in another preferred embodiment, the calculation of the capacity coefficient may be implemented according to the above formula, where the larger the capacity coefficient is, the worse the performance condition when implementing data transmission is, and therefore, a transmission path with the smallest capacity coefficient needs to be selected as the current path, so that after the performance condition of the transmission path is effectively represented, the transmission path with the better performance condition is selected as the current path. If X transmission paths are selected as the current path Lw, w ═ i,2.. X.
Before determining that all frequency points corresponding to the maximum current channel capacity between every two adjacent nodes are transmission frequency points, the data transmission method provided by the embodiment of the present invention may further include:
calculating the weighted channel capacity of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point according to the following formula:
Ca(t,LLq(N-1)Lq(N)kN)＝a Ca(t,LLq(N-1)Lq(N)kN)+(1-a)Ca(t-1,LLq(N-1)Lq(N)kN)，
wherein, Ca (t, L)Lq(N-1)Lq(N)kN) Representing the weighted channel capacity of data transmission between the N-1 th node and the Nth node in any transmission path by adopting a frequency point KN, wherein a represents a weighted coefficient;
and determining the weighted channel capacity of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point as the current channel capacity.
In order to enable the determined channel capacity when data transmission is performed between every two adjacent nodes in each transmission path by adopting each frequency point to more reflect the actual data transmission condition, in the embodiment of the application, the weighted channel capacity can be calculated by combining the time t and the channel capacity at the last time of the time t, and finally, the calculated weighted channel capacity is assigned to the current channel capacity, so that the update of the current channel capacity is realized; and a in the above formula exists 0< a < 1.
The data transmission method provided in the embodiment of the present invention determines that the channel capacity for performing data transmission between every two adjacent nodes in each transmission path by using each frequency point is the current channel capacity, and may include:
determining a signal-to-noise ratio between every two adjacent nodes in each transmission path, wherein each frequency point is adopted for data transmission, determining a physical layer transmission mode of the wireless ad hoc network system, determining a corresponding relation table of the wireless ad hoc network system for representing the signal-to-noise ratio and the channel capacity in the corresponding physical layer transmission mode, and determining that the channel capacity respectively corresponding to each signal-to-noise ratio is the current channel capacity from the corresponding relation table;
or: determining the signal-to-noise ratio of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point, determining the physical layer transmission mode of the wireless ad hoc network system, determining a curve of the wireless ad hoc network system expressing the signal-to-noise ratio and the channel capacity under the corresponding physical layer transmission mode, and determining that the channel capacity respectively corresponding to each signal-to-noise ratio is the current channel capacity from the curve.
It should be noted that, a corresponding curve representing a correspondence between the signal-to-noise ratio and the channel capacity may be set by a worker in advance for different physical layer transmission modes, an abscissa of the curve may represent the signal-to-noise ratio, and an ordinate represents the channel capacity, so that after the curve is obtained, a point corresponding to any signal-to-noise ratio is determined on a curve corresponding to a physical layer transmission mode of the wireless ad hoc network system, and a value of an ordinate of the point is the channel capacity of the any signal-to-noise ratio, so that the curve can be used to conveniently and quickly obtain the channel capacity of each signal-to-noise ratio, and the wireless ad hoc network system is suitable for a same frequency/different frequency network, and has universality. Specifically, the meaning of the physical layer transmission mode is the same as that of the corresponding concept in the prior art, and may include 16QAM modulation, QPSK modulation, and the like, as shown in fig. 2, which is a graph showing the correspondence between the signal-to-noise ratio and the channel capacity when the physical layer transmission mode of the wireless ad hoc network system is 16QAM modulation, and as shown in fig. 3, which is a graph showing the correspondence between the signal-to-noise ratio and the channel capacity when the physical layer transmission mode of the wireless ad hoc network system is QPSK modulation.
In another embodiment, a fast calculation look-up table (i.e. a corresponding table) representing the correspondence between the snr and the channel capacity may be obtained in advance by a worker for different physical layer transmission modes, as shown in table 1, which is a fast calculation look-up table showing the correspondence between the signal-to-noise ratio and the channel capacity when the physical layer transmission mode of the wireless ad hoc network system is 16QAM modulation, as shown in table 2, which is a fast calculation look-up table representing the correspondence between the signal-to-noise ratio and the channel capacity at the time of QPSK modulation in the physical layer transmission mode of the wireless ad hoc network system, and thus, when the channel capacity corresponding to any signal-to-noise ratio needs to be determined, the signal-to-noise ratio of any wireless ad hoc network system can be directly positioned in the quick calculation query table, and then the channel capacity corresponding to the positioned signal-to-noise ratio is determined, thereby further simplifying the calculation operation.
TABLE 1
TABLE 2
The data transmission method provided in the embodiment of the present invention controls data transmission between every two adjacent nodes in a current path according to corresponding transmission frequency points, and may include:
and controlling data transmission between every two adjacent nodes in the current path according to the corresponding transmission frequency point in a time interval determined by dividing time slots based on a TDMA system.
When determining data transmission among different nodes, the embodiment of the application can divide time slots by a TDMA system, and further carry out data transmission according to time intervals allocated by the divided time slots; therefore, when data transmission is carried out among different nodes according to different frequency points, data transmission is carried out in different time periods, and the anti-interference capacity is further improved.
The data transmission method provided in the embodiment of the present invention may further include, after controlling data transmission between every two adjacent nodes in the current path according to the corresponding transmission frequency point:
and returning the information that the transmission of the data needing to be transmitted is realized.
In order to facilitate that a terminal monitoring data transmission operation can timely know the data transmission condition, in the embodiment of the application, after data transmission between a source node and a target node is realized each time, information for realizing the data transmission can be returned to the monitored terminal, so that the terminal can know the data transmission condition or perform other operations and the like.
In a specific embodiment, for a wireless ad hoc network system, each node may use a digital integrated circuit chip as a data transmission method according to the following steps in sequence:
step (1) Y nodes and K frequency points in a wireless ad hoc network system are set; any one of K frequency points is supported to be selected for transmission among any node, and the transmission among different nodes is carried out by dividing time slots according to a TDMA system; setting P physical layer transmission modes supported in wireless self-organizing network system, wherein the transmission mode of the physical layer is LijkY is a node number, K is a frequency point selected between two nodes ij, and L is 1,2ijkAnd the two nodes representing i and j adopt a frequency point k for transmission.
In the step (2), L different transmission paths Lq are set between two nodes needing transmission, wherein q is 1,2.. L, the nodes passed by the Lq-th path are Lq (Nq), and Nq is 1,2.. Yqy, the total number of passed nodes is Yqy, a variable of the current path is set, and all the L transmission paths are assigned to the current path. Setting SNR (t, i, j, k) to represent signal-to-noise ratio when the kth frequency point is adopted for transmission between the ith node and the j node when time t is represented, wherein t represents time, and other parameters of t involved in the embodiments of the present application all represent corresponding information at time t, such as Ca (t, L)Lq(N-1)Lq(N)kN) Which represents the channel capacity between the corresponding nodes at time t.
Step (3) calculating the channel capacity Ca (t, L) transmitted between each node of L different transmission paths by SNR (t, i, j, k) through a curve of signal-to-noise ratio and channel capacityLq(N-1)Lq(N)kN) Wherein Lq (N-1) and Lq (N) are passed by the N-1 th hop on the Lq-th transmission pathNode, kN 1,2.. K represents different frequency points.
And (4) calculating the weighted channel capacity of different frequency points transmitted among the nodes according to the following formula:
Ca(t,LLq(N-1)Lq(N)kN)＝a Ca(t,LLq(N-1)Lq(N)kN)+(1-a)Ca(t-1,LLq(N-1)Lq(N)kN),
wherein 0< a < 1.
And (5) selecting the maximum value of the weighted channel capacity of different frequency points among the nodes according to the following formula:
k represents different frequency points; correspondingly, the kN value selected by Ca (t, Lq (N-1), Lq (N)) is kN (t, N), and the modulation mode is LLq(N-1)Lq(N)kN(t,N)。
And (6) calculating the capacity coefficients CC (t, L) of different transmission paths according to the following formula:
and (7) selecting the transmission path L (t) corresponding to the minimum value of the capacity coefficient CC (t, L) as the optimal transmission path, and assigning the optimal transmission path to the current path.
Step (8) realizes data transmission according to the optimal transmission path selected in step (7), and the transmission frequency points among the nodes in the optimal transmission path and the physical layer transmission mode are according to kN (t, N) and L in step (5)Lq(N-1)Lq(N)kN(t,N)And selecting and realizing.
In another embodiment, the transceiving of each node in the wireless ad hoc network system uses orthogonal frequency division multiplexing, OFDM, technology for communication. Setting 8 nodes and 3 frequency points in the wireless ad hoc network system, wherein any node supports the selection of any frequency point of the 3 frequency points for transmission, and the transmission between different nodes depends on the time slot division of a TDMA system for transmission. The wireless ad hoc network system is set to support 2 physical layer transmission modes of 16QAM and QPSK, the physical layer transmission mode is Lijk, i, j is 1,2.. 8 is node number, k is 1,2,3 are frequency points selected between two nodes of ij, and each frequency point interval is 50M. At this time, the data transmission method provided by the present application may include the following steps:
in the step (1), L different transmission paths Lq are set between two nodes which need to realize data transmission, wherein q is 1,2.. L, the nodes passed by the Lq-th path are Lq (Nq), Nq is 1,2.. Yqy, and the total number of passed nodes is Yqy. And setting SNR (t, i, j, k) to represent the SNR when the kth frequency point is adopted for transmission between the ith node and the jth node at time t.
And (2) calculating channel capacities CakN (t, Lq (N-1), Lq (N)) and Lq (N)) transmitted between nodes of L different paths transmitted from Y1 to Y2 by using SNR (t, i, j, k) according to a set SNR-channel capacity corresponding curve, wherein Lq (N-1) and Lq (N) are nodes passed by the Nth hop on the path in the Lq, and kN is 1,2 and 3 represent different frequency points.
Step (3) calculating the weighted channel capacity of different frequency points transmitted among the nodes:
CakN (t, Lq (N-1), Lq (N)), () a CakN (t, Lq (N-1), Lq (N)) + (1-a) CakN (t-1, Lq (N-1), Lq (N)), wherein 0< a < 1.
Selecting the maximum value of the weighted channel capacity of different transmission frequency points among the nodes:
representing different frequency points. The kN value corresponding to Cak (t, Lq (N-1), Lq (N)) is kN (t, N).
Calculating capacity coefficients CC (t, L) of different paths:
and (6) selecting the minimum value of the capacity coefficient CC (t, L) as the optimal transmission path.
Step (7) according to the best transmission path selected in step (6), data transmission is carried out, and the transmission frequency points between the nodes areAnd the physical layer transmission mode is according to kN (t, N) and L in the step (4)Lq(N-1)Lq(N)kN(t,N)And selecting and realizing.
In addition, after each variable involved in the embodiment of the present application is assigned, the value of the variable is updated to the assigned value. Through practical tests, the data transmission method for performing optimal path transmission among different nodes in the wireless ad hoc network by using different frequencies can ensure that part of nodes with interference transmit by using other frequencies and paths to ensure the transmission performance of the system, thereby ensuring the transmission throughput rate of the system as much as possible under the condition of interference.
An embodiment of the present invention further provides a data transmission device, as shown in fig. 4, which may include:
a first determining module 11, configured to: determining a source node and a target node in a wireless ad hoc network system, and a plurality of transmission paths capable of transmitting data between the source node and the target node;
a second determining module 12, configured to: determining that the channel capacity of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point is the current channel capacity, and determining that the frequency points corresponding to the maximum current channel capacity between every two adjacent nodes are the transmission frequency points;
a selecting module 13 for: calculating capacity coefficients corresponding to all nodes contained in each transmission path based on the current channel capacity, and selecting one transmission path as a current path based on the capacity coefficients;
a transmission module 14 for: and distributing the data to be transmitted to the current path, and controlling the data transmission between every two adjacent nodes in the current path according to the corresponding transmission frequency point.
In an embodiment of the data transmission apparatus, a selection module may include:
a computing unit to: calculating capacity coefficients corresponding to all nodes contained in each transmission path according to the following formula:
where t denotes time, CC (t, L) denotes a capacity coefficient of an arbitrary transmission path, Lqy denotes the total number of nodes included in the arbitrary transmission path, and Ca (t, Lq (N-1), Lq (N)) denotes the maximum current channel capacity between the N-1 st node and the N-th node in the arbitrary transmission path.
The data transmission device provided in the embodiment of the present invention may further include:
a third determination module to: before determining that the frequency points corresponding to the maximum current channel capacity between every two adjacent nodes are all transmission frequency points, calculating the weighted channel capacity of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point according to the following formula:
Ca(t,LLq(N-1)Lq(N)kN)＝a Ca(t,LLq(N-1)Lq(N)kN)+(1-a)Ca(t-1,LLq(N-1)Lq(N)kN)，
wherein, Ca (t, L)Lq(N-1)Lq(N)kN) Representing the weighted channel capacity of data transmission between the N-1 th node and the Nth node in any transmission path by adopting a frequency point KN, wherein a represents a weighted coefficient; and determining the weighted channel capacity of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point as the current channel capacity.
In an embodiment of the data transmission apparatus, the second determining module may include:
a first determination unit configured to: determining a signal-to-noise ratio between every two adjacent nodes in each transmission path, wherein each frequency point is adopted for data transmission, determining a physical layer transmission mode of the wireless ad hoc network system, determining a corresponding relation table of the wireless ad hoc network system for representing the signal-to-noise ratio and the channel capacity in the corresponding physical layer transmission mode, and determining that the channel capacity respectively corresponding to each signal-to-noise ratio is the current channel capacity from the corresponding relation table;
a second determination unit configured to: determining the signal-to-noise ratio of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point, determining the physical layer transmission mode of the wireless ad hoc network system, determining a curve of the wireless ad hoc network system expressing the signal-to-noise ratio and the channel capacity under the corresponding physical layer transmission mode, and determining that the channel capacity respectively corresponding to each signal-to-noise ratio is the current channel capacity from the curve.
In an embodiment of the data transmission apparatus provided in the present invention, a transmission module may include:
a transmission unit for: and controlling data transmission between every two adjacent nodes in the current path according to the corresponding transmission frequency point in a time interval determined by dividing time slots based on a TDMA system.
The data transmission device provided in the embodiment of the present invention may further include:
a return module to: and after controlling data transmission between every two adjacent nodes in the current path according to the corresponding transmission frequency points, returning information for realizing the transmission of the data to be transmitted.
An embodiment of the present invention further provides a data transmission device, which may include:
a memory for storing a computer program;
a processor for implementing the steps of the data transmission method as described in any one of the above when executing the computer program.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of the data transmission method according to any one of the above.
It should be noted that, for descriptions of relevant parts in a data transmission device, a device and a storage medium provided in the embodiments of the present invention, reference is made to detailed descriptions of corresponding parts in a data transmission method provided in the embodiments of the present invention, and details are not described herein again. In addition, parts of the technical solutions provided in the embodiments of the present invention that are consistent with the implementation principles of the corresponding technical solutions in the prior art are not described in detail, so as to avoid redundant description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method of data transmission, comprising:
determining a source node and a target node in a wireless ad hoc network system, and a plurality of transmission paths capable of transmitting data between the source node and the target node;
determining that the channel capacity of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point is the current channel capacity, and determining that the frequency points corresponding to the maximum current channel capacity between every two adjacent nodes are the transmission frequency points;
calculating capacity coefficients corresponding to all nodes contained in each transmission path based on the current channel capacity, and selecting one transmission path as a current path based on the capacity coefficients;
and distributing the data to be transmitted to the current path, and controlling the data transmission between every two adjacent nodes in the current path according to the corresponding transmission frequency point.
2. The method of claim 1, wherein calculating capacity coefficients corresponding to all nodes included in each transmission path based on a current channel capacity comprises:
calculating capacity coefficients corresponding to all nodes contained in each transmission path according to the following formula:
where t denotes time, CC (t, L) denotes a capacity coefficient of an arbitrary transmission path, Lqy denotes the total number of nodes included in the arbitrary transmission path, and Ca (t, Lq (N-1), Lq (N)) denotes the maximum current channel capacity between the N-1 st node and the N-th node in the arbitrary transmission path.
3. The method of claim 2, wherein before determining that the frequency points corresponding to the maximum current channel capacity between every two adjacent nodes are all transmission frequency points, the method further comprises:
calculating the weighted channel capacity of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point according to the following formula:
Ca(t,LLq(N-1)Lq(N)kN)＝a Ca(t,LLq(N-1)Lq(N)kN)+(1-a)Ca(t-1,LLq(N-1)Lq(N)kN)，
wherein, Ca (t, L)Lq(N-1)Lq(N)kN) Representing the weighted channel capacity of data transmission between the N-1 th node and the Nth node in any transmission path by adopting a frequency point KN, wherein a represents a weighted coefficient;
and determining the weighted channel capacity of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point as the current channel capacity.
4. The method of claim 3, wherein determining that the channel capacity for data transmission between every two adjacent nodes in each transmission path using each frequency point is the current channel capacity comprises:
determining the signal-to-noise ratio of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point, determining the physical layer transmission mode of the wireless ad hoc network system, determining a corresponding relation table of the wireless ad hoc network system for expressing the signal-to-noise ratio and the channel capacity under the corresponding physical layer transmission mode, and determining that the channel capacity respectively corresponding to each signal-to-noise ratio is the current channel capacity from the corresponding relation table.
5. The method of claim 4, wherein determining that the channel capacity for data transmission between every two adjacent nodes in each transmission path using each frequency point is the current channel capacity comprises:
determining the signal-to-noise ratio of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point, determining the physical layer transmission mode of the wireless ad hoc network system, determining a curve of the wireless ad hoc network system expressing the signal-to-noise ratio and the channel capacity under the corresponding physical layer transmission mode, and determining that the channel capacity respectively corresponding to each signal-to-noise ratio is the current channel capacity from the curve.
6. The method according to claim 4 or 5, wherein controlling data transmission between every two adjacent nodes in the current path according to the corresponding transmission frequency point comprises:
and controlling data transmission between every two adjacent nodes in the current path according to the corresponding transmission frequency point in a time interval determined by dividing time slots based on a TDMA system.
7. The method of claim 6, wherein after controlling data transmission between every two adjacent nodes in the current path according to the corresponding transmission frequency point, the method further comprises:
and returning the information that the transmission of the data needing to be transmitted is realized.
8. A data transmission apparatus, comprising:
a first determination module to: determining a source node and a target node in a wireless ad hoc network system, and a plurality of transmission paths capable of transmitting data between the source node and the target node;
a second determination module to: determining that the channel capacity of data transmission between every two adjacent nodes in each transmission path by adopting each frequency point is the current channel capacity, and determining that the frequency points corresponding to the maximum current channel capacity between every two adjacent nodes are the transmission frequency points;
a selection module for: calculating capacity coefficients corresponding to all nodes contained in each transmission path based on the current channel capacity, and selecting one transmission path as a current path based on the capacity coefficients;
a transmission module to: and distributing the data to be transmitted to the current path, and controlling the data transmission between every two adjacent nodes in the current path according to the corresponding transmission frequency point.
9. A data transmission device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the data transmission method according to any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the data transmission method according to one of claims 1 to 7.
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